CN117028043B - Online detection method, equipment, storage medium and device for engine EGR flow - Google Patents
Online detection method, equipment, storage medium and device for engine EGR flowInfo
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- CN117028043B CN117028043B CN202311135785.9A CN202311135785A CN117028043B CN 117028043 B CN117028043 B CN 117028043B CN 202311135785 A CN202311135785 A CN 202311135785A CN 117028043 B CN117028043 B CN 117028043B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
- F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
- F02D2021/083—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine controlling exhaust gas recirculation electronically
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Analytical Chemistry (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The application relates to an EGR flow on-line detection method, equipment, a storage medium and a device of an engine. The method comprises the following steps of S100, enabling an engine to perform simulated operation in N standard states, and obtaining simulated operation parameters of the engine in each standard state, wherein N is an integer more than or equal to 2, and at least one of the operation rotating speed and the load of the engine in each standard state is different. S200, obtaining cooling medium heat absorption power W w Standard of and waste gas heat dissipation power W e Standard of in each standard state according to simulated operation parameters of the engine in each standard state, obtaining correction coefficient delta Standard of between W w and W e in each standard state according to W w Standard of and W e Standard of , S300, obtaining operation rotating speed, load and on-line operation parameters of the engine in an on-line operation state, and S400, obtaining EGR flow of the engine in the on-line operation state according to the correction coefficient in each standard state, the operation rotating speed, load and on-line operation parameters of the engine in the on-line operation state.
Description
Technical Field
The application relates to the technical field of engine measurement and control, in particular to an EGR flow on-line detection method, equipment, a storage medium and a device of an engine.
Background
In the field of engine technology, how to reduce engine emission pollutants is an important research and development direction. Development of a technology and a corresponding system capable of simultaneously reducing emissions of diesel particulates and nitrogen oxides (NOx) is one of the important subjects in the fields of engines and environmental protection. The EGR (Exhaust Gas Recirculation ) technology is to introduce part of the exhaust gas from the exhaust pipe back to the cylinder through a pipeline, and because the specific heat of three primary gases such as CO 2、H2 O and NO 2 in the exhaust gas of the engine is higher, when the fresh gas entering the engine is mixed with the exhaust gas, the heat capacity is increased, so that the heat power required by raising the temperature of the gas diluted by the exhaust gas by 1 ℃ is also increased. That is, when the total amount of fuel combustion heat release is not changed, the combustion temperature of the engine is also reduced, and thus the generation of NOx can be reduced. In addition, NOx formation can be further suppressed because the dilution effect of the exhaust gas on the fresh gas reduces the concentration of oxygen.
EGR rate refers to the ratio of recirculated exhaust gas to the total amount of intake air drawn into the engine cylinders, directly affecting engine performance and NOx emissions, and control of EGR rate is therefore critical. The accuracy of EGR rate control is closely related to the accuracy of EGR flow measurement. The flow of waste gas is mostly measured by a venturi tube in the traditional technology, and the smaller the sectional area of the throat opening of the venturi tube is, the higher the accuracy of the measurement result is. However, the smaller the throat, the greater the flow resistance to the EGR line, affecting the introduction of exhaust gas, which can result in an EGR rate that does not meet design requirements. Even if the EGR rate can meet design requirements, energy consumption is increased. That is, the conventional technology has a problem of contradiction between measurement accuracy and line flow resistance when measuring EGR flow in an engine operating state.
Therefore, how to improve the accuracy of online detection of the EGR flow in the engine operating state without increasing the flow resistance of the EGR pipeline is a technical problem to be solved.
Disclosure of Invention
Accordingly, there is a need for an EGR flow on-line detection method, apparatus, storage medium, and device that can improve the accuracy of EGR flow detection in an engine operating state without increasing EGR line flow resistance.
In a first aspect of the present application, there is provided an EGR flow rate on-line detection method for an engine, including the steps of:
S100, enabling an engine to perform simulated operation under N standard states, and obtaining simulated operation parameters of the engine under each standard state, wherein the simulated operation parameters comprise a cooling medium inlet temperature T 1 Standard of , a cooling medium outlet temperature T 2 Standard of , an exhaust gas inlet temperature T 3 Standard of , an exhaust gas outlet temperature T 4 Standard of , a cooling medium flow m w Standard of , an EGR flow m e Standard of and an exhaust gas pressure P Standard of of an EGR cooler, N is an integer more than or equal to 2, and at least one of the operation rotating speed and the load of the engine under each standard state is different;
S200, according to the simulated operation parameters of the engine in each standard state, obtaining cooling medium heat absorption power W w Standard of and waste gas heat dissipation power W e Standard of in each standard state, and according to each cooling medium heat absorption power W w Standard of and each waste gas heat dissipation power W e Standard of , obtaining a correction coefficient delta Standard of between the W w Standard of and the W e Standard of in each standard state;
S300, acquiring the running speed, load and on-line running parameters of the engine in an on-line running state, wherein the on-line running parameters comprise cooling medium inlet temperature T 1 Operation , cooling medium outlet temperature T 2 Operation , exhaust gas inlet temperature T 3 Operation , exhaust gas outlet temperature T 4 Operation , cooling medium flow m w Operation and exhaust gas pressure P Operation of the EGR cooler;
s400, according to the correction coefficient in each standard state, the running rotating speed and load of the engine in the on-line running state and the on-line running parameters, the EGR flow of the engine in the on-line running state is obtained.
According to the EGR flow online detection method, the engine is simulated to run in N standard states, correction coefficients between W w Standard of and W e Standard of in the corresponding standard states are determined according to T 1 Standard of 、T2 Standard of 、T3 Standard of 、T4 Standard of 、mw Standard of 、me Standard of and P Standard of obtained in each standard state, then the rotating speed, the load, T 1 Operation 、T2 Operation 、T3 Operation 、T4 Operation and P Operation of the engine in the online running state are obtained, and the EGR flow m e Operation in the online running state is determined based on the data in the online running state and the correction coefficients. According to the detection method, in the operation stage of the engine, the venturi tube is not required to be used for EGR flow test, so that the flow resistance of the EGR pipeline is not increased. Further, besides the heat of the exhaust gas in the engine EGR, a part of heat is dissipated in a radiation convection mode, and the heat dissipated in the radiation convection mode is related to the rotating speed and the load of the engine, so that the relation between W w Standard of and W e Standard of can be accurately corrected through a correction coefficient delta Standard of , the EGR flow in the on-line running state can be accurately determined according to delta Operation of the on-line running state, and meanwhile, the running state of the engine is simulated by adopting N standard states, so that the accuracy of a detection result can be improved.
In some of these embodiments, the operating speeds and loads for the N standard states are determined according to the following steps:
Selecting a different standard running speeds;
setting b different standard loads at each operating speed;
Taking one standard running rotating speed and one standard load as a set of standard state parameters, wherein the simulated running of the engine under the standard state refers to the running of the engine under the standard state parameters;
Wherein n=a×b, a and b are each independently selected from integers of ≡1.
In some embodiments, the detection method satisfies at least one of the following (1) - (4):
(1) The a different running speeds are distributed in an equidistant gradient mode;
(2) a is an integer greater than or equal to 4;
(3) The magnitudes of the b different loads are distributed in an equidistant gradient manner;
(4) b is an integer greater than or equal to 4.
In some of these embodiments, S200 comprises the steps of:
Obtaining the W w Standard of in a corresponding standard state according to the T 1 Standard of , the T 2 Standard of , the m w Standard of and the formula (1);
Obtaining the W e Standard of in a corresponding standard state according to the T 3 Standard of , the T 4 Standard of , the m m Standard of and the formula (2);
Calculating the delta Standard of according to equation (3);
wherein, the formulas (1) - (3) are as follows:
w w＝Cw×mw×(T2-T1) equation (1),
W e＝Ce×me×(T3-T4) equation (2),
Delta=w e/Ww formula (3),
In the formulas (1) - (3), T 1 is the temperature of the cooling medium inlet, T 2 is the temperature of the cooling medium outlet, T 3 is the temperature of the exhaust gas inlet, T 4 is the temperature of the exhaust gas outlet, C w is the specific heat capacity of the cooling medium, m w is the flow rate of the cooling medium, C e is the specific heat capacity of the exhaust gas, and m e is the flow rate of the exhaust gas.
In some of these embodiments, the specific heat capacity of exhaust gas at each standard condition, C e Standard of , is determined as follows:
Determining the components of the waste gas and the molar content of each component in the corresponding standard state according to the T 3 Standard of or the T 4 Standard of and the P Standard of ;
c e Standard of is obtained according to the formula (4);
Wherein the formula (4) is as follows:
C e＝a1×C1+……+an-1×C n-1+an×Cn equation (4),
A 1 and C 1 are the molar content and specific heat capacity of the first component in the exhaust gas, a n-1 and C n-1 are the molar content and specific heat capacity of the n-1 th component in the exhaust gas, respectively, and a n and C n are the molar content and specific heat capacity of the n-th component in the exhaust gas, respectively.
In some of these embodiments, S400 includes the steps of:
Obtaining a correction relation between the rotating speed and the load and the correction coefficient delta Standard of in the standard state according to the operating rotating speed and the load of the engine in each standard state and the corresponding correction coefficient delta Standard of ;
Interpolating the running speed and load of the engine in the online running state into the correction relation to obtain a corresponding correction coefficient delta Operation ;
Obtaining cooling medium heat absorption power W w Operation in an on-line running state according to the T 1 Operation , the T 2 Operation and the formula (1);
Obtaining waste gas heat dissipation power W e Operation in an on-line running state according to the delta Operation , the W w Operation and the formula (3);
determining the components of the waste gas and the molar content of each component in an on-line running state according to the T 3 Operation or the T 4 Operation and the P Operation , and obtaining C e Operation according to a formula (4);
And obtaining the EGR flow m e Operation of the running state according to the W e Operation , the C e Operation , the T 3 Operation , the T 4 Operation and the formula (2).
In some embodiments, the P Standard of is the inlet pressure or the outlet pressure of the exhaust gas in the standard state, and the P Operation is the inlet pressure or the outlet pressure of the exhaust gas in the on-line operation state.
In some embodiments, the m w Operation is obtained as follows:
Obtaining the corresponding relation between the rotating speed and the load and m Standard of in the standard state according to the operating rotating speed and the load of the engine in each standard state and the corresponding m Standard of ;
And interpolating the running rotating speed and the load of the engine in the online running state into the corresponding relation to obtain the m w Operation .
In a second aspect of the present application, there is provided a computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method for online detection of EGR flow of an engine according to the first aspect.
In a third aspect of the present application, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for online detection of EGR flow of an engine according to the first aspect.
In a fourth aspect of the present application, there is provided an EGR flow rate on-line detection device for an engine, comprising:
The state parameter acquisition module is used for acquiring the running rotating speed and the load of the engine in the online running state;
An online detection module for testing online operation parameters of the engine, wherein the online operation parameters comprise a cooling medium inlet temperature T 1 Operation , a cooling medium outlet temperature T 2 Operation , an exhaust gas inlet temperature T 3 Operation , an exhaust gas outlet temperature T 4 Operation and an exhaust gas pressure P Operation of the EGR cooler;
a memory storing a computer program, and
And a processor for implementing the steps of the method for online detecting the EGR flow of the engine according to the first aspect when the processor executes the computer program.
In some of these embodiments, the online testing module comprises:
A temperature detection assembly for testing the T 1 Operation , the T 2 Operation , the T 3 Operation , and the T 4 Operation ;
and a pressure detector for testing the P Operation .
In some embodiments, the EGR flow on-line detection device of an engine further includes:
the simulation detection module is used for testing simulation operation parameters of the engine in each standard state, wherein the simulation operation parameters comprise cooling medium inlet temperature T 1 Standard of , cooling medium outlet temperature T 2 Standard of , exhaust gas inlet temperature T 3 Standard of , exhaust gas outlet temperature T 4 Standard of , cooling medium standard flow m w Standard of , EGR standard flow m e Standard of and exhaust gas pressure P Standard of of the EGR cooler;
the simulated operation parameters and standard state parameters in the standard states are stored in the memory, and the standard state parameters comprise the operation rotating speed and the load of the engine in the corresponding standard states.
Drawings
FIG. 1 is a diagram of an application environment of an EGR flow on-line detection method of an engine in a standard state of the engine in one embodiment;
FIG. 2 is an application environment diagram of the EGR flow online detection method of FIG. 1 in an online operating state of an engine;
Fig. 3 is an application environment diagram of a conventional EGR flow rate detection method.
Reference numerals illustrate:
101-EGR cooler, 102-temperature detection assembly, 102 a-cooling medium inlet temperature sensor, 102 b-cooling medium outlet temperature sensor, 102 c-exhaust gas inlet temperature sensor, 102 d-exhaust gas outlet temperature sensor, 103-pressure detector, 104-liquid flow detector, 105-gas flow detector, 106-engine cylinder, 107-EGR valve, 108-exhaust pipe, 109-intake pipe, 110-supercharger, 111-intake cooler, 112-throttle, 113-EGR cooling medium line, 114-EGR exhaust gas line.
201-EGR cooler, 202-temperature detector, 203-venturi, 2031-first pressure detector, 2032-second pressure detector, 204-engine cylinder, 205-EGR valve, 206-exhaust pipe, 207-intake pipe, 208-supercharger, 209-intake cooler, 210-throttle, 211-EGR cooling medium line, 212-EGR exhaust gas line.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In this document, when an element is referred to as being "fixed" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
The weights of the relevant components mentioned in the description of the embodiments of the present application may refer not only to the specific contents of the components, but also to the proportional relationship between the weights of the components, so long as the contents of the relevant components in the description of the embodiments of the present application are scaled up or down within the scope of the disclosure of the embodiments of the present application. Specifically, the weight described in the specification of the embodiment of the application can be mass units known in the chemical industry field such as mu g, mg, g, kg.
The method for detecting the EGR flow of the engine on line can be applied to application environments shown in fig. 1 and 2, wherein fig. 1 is an application environment diagram of the engine in a standard state, and fig. 2 is an application environment diagram of the engine in an on-line running state.
As shown in fig. 1, the engine system includes an EGR system and other structures, exhaust gas in engine cylinders 106 is exhausted through exhaust pipe 108, a portion of the exhaust gas enters the EGR system through EGR exhaust line 114, and another portion of the exhaust gas flows into supercharger 110. After being cooled by the EGR cooler 101, the recirculating exhaust gases (i.e. EGR exhaust gases) entering the EGR system are led via the EGR valve 107 into the inlet line 109 where they are mixed with fresh gas and subsequently flow into the engine cylinders 106. The EGR system further comprises a temperature detection assembly 102, a pressure detector 103, a liquid flow detector 104, a gas flow detector 105 and an EGR cooling medium line 113 for transporting the cooling medium, wherein the temperature detection assembly 102 comprises a cooling medium inlet temperature sensor 102a and a cooling medium outlet temperature sensor 102b arranged on the EGR cooling medium line 113, and an exhaust gas inlet temperature sensor 102c and an exhaust gas outlet temperature sensor 102d arranged on the EGR exhaust gas line 114. The cooling medium inlet temperature sensor 102a is used to measure the cooling medium inlet temperature T 1 Standard of , the cooling medium outlet temperature sensor 102b is used to measure the cooling medium outlet temperature T 2 Standard of , the exhaust gas inlet temperature sensor 102c is used to measure the exhaust gas inlet temperature T 3 Standard of , the exhaust gas temperature sensor 102d is used to measure the exhaust gas outlet temperature T 4 Standard of , the pressure detector 103 is used to measure the EGR pressure P Standard of , the liquid flow detector 104 is used to measure the cooling medium flow m w Standard of , and the gas flow detector 105 is used to measure the EGR flow m e Standard of . The engine system also includes an intake cooler 111 and a throttle valve 112 for regulating the temperature and flow of fresh gas, respectively.
As shown in fig. 2, in the on-line running state of the engine, the engine system does not contain the liquid flow detector 104 and the gas flow detector 105, and other structures of the engine system are similar to those in the standard state. In the on-line operation state, the cooling medium inlet temperature sensor 102a is used for the cooling medium inlet temperature T 1 Operation , the cooling medium outlet temperature sensor 102b is used for the measurement of the cooling medium outlet temperature T 2 Operation , the exhaust gas inlet temperature sensor 102c is used for the measurement of the exhaust gas inlet temperature T 3 Operation , the exhaust gas outlet temperature sensor 102d is used for the measurement of the exhaust gas outlet temperature T 4 Operation , and the pressure detector 103 is used for the measurement of the EGR pressure P Operation . In addition, the cooling medium flow rate m w Operation can be obtained by the correspondence between the rotational speed and load and m Standard of . It should be noted that, the standard state and the on-line running state of the engine may be measured by the same detecting device, for example, the same cooling medium inlet temperature sensor 102a may be used to test T 1 Standard of and T 1 Operation , or different detecting devices may be used to measure the state parameters at the same place in the engine system, which is not limited in this application.
As can be seen from fig. 2, the engine system in the on-line operation state is not equipped with the gas flow rate detector 105, so that the flow resistance to which the recirculated exhaust gas is subjected is hardly increased. In most of the conventional EGR flow detection methods, a venturi tube is connected to an exhaust gas pipeline to test the flow of exhaust gas, so that the flow resistance of the pipeline affects the transmission of recirculated exhaust gas. Exemplary, the conventional EGR flow detection method is applied to the environment as shown in fig. 3, in which the recirculated exhaust gas is cooled by the EGR cooler 201, and then flows through the venturi 203 to be tested, and then enters the EGR valve 205 and the intake pipe 207. Wherein the venturi 203 obtains the flow rate of the exhaust gas based on the pressure of the inlet section measured by the first pressure detector 2031 and the pressure of the throat section measured by the second pressure detector 2032, and the smaller the area of the throat section, the more accurate the test result, but the greater the flow resistance the exhaust gas is subjected to. Therefore, the conventional technology has a problem of contradiction between measurement accuracy and line flow resistance when measuring EGR flow in an engine operating state. Other structures in fig. 3 are all structures in the prior art, and are not described herein.
The method for online detecting the EGR flow of the engine, which is provided by the embodiment of the application, is described in detail below.
The EGR flow online detection method of the engine provided by the embodiment of the application comprises the following steps S100-S400.
S100, enabling the engine to perform simulated operation under N standard states, and obtaining simulated operation parameters of the engine under each standard state, wherein the simulated operation parameters comprise cooling medium inlet temperature T 1 Standard of , cooling medium outlet temperature T 2 Standard of , exhaust gas inlet temperature T 3 Standard of , exhaust gas outlet temperature T 4 Standard of , cooling medium flow m w Standard of , EGR flow m e Standard of and EGR pressure P Standard of of the EGR cooler, N is an integer which is more than or equal to 2, and at least one of the operation rotating speed and load of the engine under each standard state is different.
The standard state is a simulated running state preset according to the running rotating speed range and the load range when the engine actually runs, and N different standard states can be obtained by changing the running rotating speed or the load, wherein the load refers to the load rate, and specifically refers to the ratio of the output power of the engine under the preset torque to the maximum torque which can be output under the preset torque. It should be noted that, the standard states and the simulation operation parameters are in one-to-one correspondence, and the number of the standard states is the same as the number of the simulation operation parameters. The cooling medium may be cooling water or other refrigerant.
S200, according to the simulated operation parameters of the engine in each standard state, obtaining cooling medium heat absorption power W w Standard of and waste gas heat dissipation power W e Standard of in each standard state, and according to each cooling medium heat absorption power W w Standard of and each waste gas heat dissipation power W e Standard of , obtaining correction coefficient delta Label (C) between W w Standard of and W e Standard of in each standard state.
It is understood that the exhaust gas temperature from the engine cylinder is relatively high and must be cooled to return to the cylinder again. The exhaust gas flows into the EGR cooler and exchanges heat power with the cooling medium, so that the purpose of cooling is achieved. The simulated operation parameters obtained in step S100 can obtain the cooling medium heat absorption power W w Standard of and the exhaust gas heat dissipation power W e Standard of , and the exhaust gas heat dissipation power W e Standard of is absorbed by the cooling medium and is also dissipated in a small part in a heat radiation manner, so that W w Standard of and W e Standard of are not completely equal, and the correction coefficient δ Standard of can be obtained according to the relationship between W w Standard of and W e Standard of . Note that, the standard states and δ Standard of are also in one-to-one correspondence, and the number of standard states is the same as the number of correction coefficients δ Standard of .
S300, acquiring the running speed, load and on-line running parameters of the engine in an on-line running state, wherein the on-line running parameters comprise the cooling medium inlet temperature T 1 Operation , the cooling medium outlet temperature T 2 Operation , the exhaust gas inlet temperature T 3 Operation , the exhaust gas outlet temperature T 4 Operation , the cooling medium flow m w Operation and the EGR pressure P Operation of the EGR cooler.
The on-line running state refers to a state in which the engine is actually running. It is understood that, in order to improve the accuracy of the detection result, the online operation state needs to use the same cooling medium as the standard state in step S100, and the online operation parameter needs to use the same acquisition method as the standard state in step S100. It should be noted that m w Operation may be determined according to the simulated operation parameters of the engine in each standard state, the operation speed and load in the on-line operation state, and the on-line operation parameters, for example, by checking a relationship table between the operation speed and load in the standard state and the cooling medium flow m w Standard of , and by combining the specific operation speed and load in the on-line operation, m w Operation ;mw Operation may also be obtained and measured by the liquid flow agent.
S400, according to the correction coefficient in each standard state, the running speed and load of the engine in the on-line running state and the on-line running parameters, the EGR flow of the engine in the on-line running state is obtained.
It is understood that the standard state is determined according to the operation speed and load of the engine, and the standard state and the correction coefficient are in one-to-one correspondence, so that the correction coefficient in the on-line operation state can be determined according to the operation speed and load of the engine in the on-line operation state in combination with the operation speed and load in the standard state, and the EGR flow in the on-line operation state can be further obtained.
According to the EGR flow online detection method, the engine is simulated to run in N standard states, correction coefficients between W w Standard of and W e Standard of in the corresponding standard states are determined according to T 1 Standard of 、T2 Standard of 、T3 Standard of 、T4 Standard of 、mw Standard of 、me Standard of and P Standard of obtained in each standard state, then the rotating speed, the load, T 1 Operation 、T2 Operation 、T3 Operation 、T4 Operation and P Operation of the engine in the online running state are obtained, and the EGR flow m e Operation in the online running state is determined based on the data in the online running state and the correction coefficients. According to the detection method, in the operation stage of the engine, the venturi tube is not required to be used for EGR flow test, so that the flow resistance of the EGR pipeline is not increased. The correction coefficient delta Standard of represents the relation between W w Standard of and W e Standard of , and the engine has different speeds and loads, and W e Standard of is different and related to the flow of the exhaust gas, so the relation between the flow of the exhaust gas and the speed and load of the engine can be constructed through the correction coefficient delta Standard of , the EGR flow in the on-line running state can be accurately determined according to delta Operation in the on-line running state, and meanwhile, the running state of the engine is simulated by adopting N standard states, so that the accuracy of the detection result can be improved.
In some of these embodiments, the operating speeds and loads for the N standard states are determined according to the following steps:
s101, selecting a different standard running speeds;
s102, setting b different standard loads at each running rotating speed;
S103, taking a standard running rotating speed and a standard load as a group of standard state parameters, wherein the simulated running of the engine in the standard state refers to running of the engine in the standard state parameters;
Wherein n=a×b, a and b are each independently selected from integers of ≡1.
It is to be understood that first a standard operating speeds are determined, on the basis of which b loads are set per standard operating speed, N standard states being obtained. It should be noted that although a and b are each independently selected from integers of 1 or more, it is desirable that N be an integer of 2 or more, that is, a and b cannot be 1 at the same time.
In some of these embodiments, the a different operating speeds are equally spaced in gradient. Specifically, a different running speeds are arranged from large to small or from small to large, and the difference between two adjacent speeds is equal. Further, the value range of a different running speeds is from the idling speed of the engine to the rated speed.
In some embodiments, a is an integer greater than or equal to 4.
According to the embodiment, the proper number of standard states can be obtained by setting the running rotating speed of equidistant gradient distribution or regulating and controlling the value of a, so that the accuracy of the detection result is improved.
In some of these embodiments, the magnitude of the b different loads is equally spaced in gradient distribution. Specifically, b different loads are arranged from large to small or from small to large, and the difference between adjacent two loads is equal. Further, the value range of b different loads is 0-100%.
In some embodiments, b is an integer greater than or equal to 4.
According to the embodiment, the load distributed in the equidistant gradient mode or the value of the regulation b is set, so that the standard state with proper quantity can be obtained, and the accuracy of the detection result is improved.
In some of these embodiments, S200 comprises the steps of:
S201, obtaining a W w Label (C) standard in a corresponding standard state according to T 1 Standard of 、T2 Standard of 、mw Standard of and a formula (1);
s202, obtaining a W e Label (C) standard in a corresponding standard state according to T 3 Standard of 、T4 Standard of 、mm Standard of and a formula (2);
S203, calculating delta Standard of according to the formula (3);
wherein, the formulas (1) - (3) are as follows:
w w＝Cw×mw×(T2-T1) equation (1),
W e＝Ce×me×(T3-T4) equation (2),
Delta=w e/Ww formula (3),
In the formulas (1) - (3), T 1 is the cooling medium inlet temperature, T 2 is the cooling medium outlet temperature, T 3 is the exhaust gas inlet temperature, T 4 is the exhaust gas outlet temperature, C w is the cooling medium specific heat capacity, m w is the cooling medium flow, C e is the exhaust gas specific heat capacity, and m e is the exhaust gas flow.
It is understood that C w changes less in the operating temperature range of the engine, so its value can be regarded as a constant. Further, correction coefficients delta Standard of corresponding to the standard states can be obtained through formulas (1) - (3) and simulation of the operation parameters. Further, since the flow rates m w and m e refer to the mass of fluid passing through the pipe section per unit time, the heat absorbed or dissipated per unit time, i.e., the heat absorption power or the heat dissipation power, is calculated from the formula (1) and the formula (2), and the thermal power is denoted by W and the thermal power is not denoted by P herein for the purpose of distinguishing from the P representing the pressure.
In some of these embodiments, the specific heat capacity of exhaust gas at each standard condition, C e Standard of , is determined as follows:
Determining the components of the waste gas and the molar content of each component under the corresponding standard state according to T 3 Standard of or T 4 Standard of and P Standard of ;
c e Standard of is obtained according to the formula (4);
Wherein the formula (4) is as follows:
C e＝a1×C1+……+an-1×C n-1+an×Cn equation (4),
A 1 and C 1 are the molar content and specific heat capacity of the first component in the exhaust gas, a n-1 and C n-1 are the molar content and specific heat capacity of the n-1 th component in the exhaust gas, respectively, and a n and C n are the molar content and specific heat capacity of the n-th component in the exhaust gas, respectively.
Specifically, the composition and content of the exhaust gas are related to the temperature and pressure of the exhaust gas, and a person skilled in the art can determine the composition of the exhaust gas and the molar content of each component in the standard state by checking a table of the composition of the exhaust gas to the temperature and pressure, and confirm C e Standard of according to formula (4). In this step, if the components and the molar contents of the components of the exhaust gas in the standard state are determined by using T 3 Standard of and P Standard of , the components and the molar contents of the components of the exhaust gas in the standard state are determined by using T 3 Operation and P Operation in the subsequent step S400. Similarly, if T 4 Standard of and P Standard of are used for this step, T 4 Operation and P Operation are used in step S400.
In some of these embodiments, S400 includes the steps of:
S401, obtaining a correction relation between the rotating speed and the load and the correction coefficient delta Standard of in the standard state according to the operating rotating speed and the load of the engine in each standard state and the corresponding correction coefficient delta Standard of ;
S402, interpolating the operation rotation speed and load of the engine in an online operation state into a correction relation to obtain a corresponding correction coefficient delta Operation ;
s403, obtaining the heat absorption power W w Operation of the cooling medium in an on-line running state according to T 1 Operation 、T2 Operation and the formula (1);
S404, obtaining the waste gas heat dissipation power W e Operation in an on-line running state according to delta Operation 、Ww Operation and a formula (3);
s405, determining components of the waste gas and molar contents of the components in an online running state according to T 3 Operation or T 4 Operation and P Operation , and obtaining C e Operation according to a formula (4);
S406, according to W e Operation 、Ce Operation 、T3 Operation 、T4 Operation and the formula (2), obtaining the EGR flow m e Operation in the running state.
Interpolation refers to interpolating a continuous function on the basis of discrete data such that the continuous curve passes through all given discrete data points. Interpolation is an important method of discrete function approximation, by which the approximation of a function at other points can be estimated from the value condition of the function at a limited number of points. Specifically, in this embodiment, a relationship between the line rotation speed and the load and the corresponding correction coefficient δ Standard of is first established in each standard state, where the relationship may be presented in a table form or may be presented in another form, and then the correction coefficient δ Operation corresponding to the online running state may be obtained by interpolating the rotation speed and the load in the online running state.
Further, in the embodiment, the operation speed, load and on-line operation parameters of the engine are obtained by using the step S300, and the EGR flow m e Operation in the operation state can be calculated by combining the formula (1) to the formula (4), so that the EGR flow obtained without using a venturi tube can be obtained, and the flow resistance of the EGR pipeline can be hardly increased.
In some of these embodiments, P Standard of is the inlet or outlet pressure of the exhaust gas at standard conditions and P Operation is the inlet or outlet pressure of the exhaust gas at on-line operating conditions.
It is understood that the heat exchange process of the exhaust gas in the EGR cooler is an isobaric process, and thus the inlet pressure of the exhaust gas and the outlet pressure of the exhaust gas in the EGR cooler are almost equal, so that either one of the inlet pressure and the outlet pressure of the exhaust gas in a standard state can be used as P Standard of . Similarly, P Operation may also employ any one of the inlet pressure and the outlet pressure of the exhaust gas in the on-line operating condition.
In some of these embodiments, m w Operation is obtained as follows:
Obtaining the corresponding relation between the rotating speed and the load and m Standard of in the standard state according to the operating rotating speed and the load of the engine in each standard state and the corresponding m Standard of ;
and interpolating the operation rotating speed and the load of the engine in the online operation state into the corresponding relation to obtain m w Transport and transport rows.
Specifically, in this embodiment, a corresponding relationship between the line rotation speed and the load and a corresponding m Standard of is first established in each standard state, where the relationship may be presented in a table form or may be presented in another form, and then m w Operation corresponding to the online running state is obtained by interpolating the rotation speed and the load in the online running state. In this embodiment, m w Operation is obtained without providing a liquid flow meter in the EGR cooler, and therefore, the transfer of the cooling medium is hardly affected, but in other embodiments, the flow rate of the cooling medium may be obtained by providing a liquid flow meter.
The application also provides a computer device, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the EGR flow online detection method of the engine when executing the computer program.
In some of these embodiments, the computer device may be a terminal. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by a processor, implements any of the inkjet printing methods described above. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
The application also provides a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, implements the steps of the method for online detection of EGR flow of an engine.
Those skilled in the art will appreciate that implementing all or part of the above-described methods may be accomplished by way of a computer program, which may be stored on a non-transitory computer readable storage medium and which, when executed, may comprise the steps of the above-described embodiments of the methods. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (SYNCHLINK) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The application also provides an EGR flow on-line detection device of the engine, comprising:
The state parameter acquisition module is used for acquiring the running rotating speed and the load of the engine in the online running state;
The online detection module is used for testing online operation parameters of the engine, wherein the online operation parameters comprise a cooling medium inlet temperature T 1 Operation , a cooling medium outlet temperature T 2 Operation , an exhaust gas inlet temperature T 3 Operation , an exhaust gas outlet temperature T 4 Operation and an exhaust gas pressure P Operation of the EGR cooler;
a memory storing a computer program, and
And the processor is used for realizing the step of the EGR flow online detection method of the engine when executing the computer program.
Understandably, the above memory stores the rotation speed, load, simulated operation parameters and corresponding correction coefficients δ Standard of corresponding to each standard state, where the state parameter acquisition module may acquire the rotation speed and load of the online operation state, the online detection module may measure the online operation parameters, and the processor executes the computer program to obtain the EGR flow of the online operation state of the engine.
In some of these embodiments, the online testing module comprises:
A temperature detection assembly for testing T 1 Operation 、T2 Operation 、T3 Operation and T 4 Operation ;
A pressure detector for testing P Operation .
Specifically, the temperature detection assembly includes four temperature detectors, which may be temperature sensors and pressure sensors, respectively, tested for T 1 Operation 、T2 Operation 、T3 Operation and T 4 Operation . It is understood that the EGR flow on-line measuring device further includes an EGR cooling medium line for transporting the cooling medium, and an EGR exhaust gas line for transporting the exhaust gas, and the temperature sensor and the pressure sensor are respectively provided at corresponding positions of the EGR cooling medium line or the EGR exhaust gas line to test T 1 Operation 、T2 Operation 、T3 Operation 、T4 Operation and P Operation .
In some of these embodiments, the EGR flow rate online detection device of an engine further includes:
The simulation detection module is used for testing simulation operation parameters of the engine in each standard state, wherein the simulation operation parameters comprise cooling medium inlet temperature T 1 Standard of , cooling medium outlet temperature T 2 Standard of , exhaust gas inlet temperature T 3 Standard of , exhaust gas outlet temperature T 4 Standard of , cooling medium standard flow m w Standard of , EGR standard flow m e Standard of and exhaust gas pressure P Standard of of the EGR cooler;
The simulated operating parameters and standard state parameters for each standard state are stored in the memory, and the standard state parameters include the operating speed and load of the engine for the corresponding standard state.
Understandably, in the calibration stage before the engine leaves the factory, the rotation speed, the load, the simulation running parameters and the corresponding correction coefficient delta Standard of corresponding to each standard state are also obtained through the simulation detection module and stored in the memory.
In some of these embodiments, the analog detection module comprises:
A temperature detection assembly for testing T 1 Standard of 、T2 Standard of 、T3 Standard of and T 4 Standard of ;
A pressure detector for testing P Standard of ;
A liquid flow detector for acquiring a standard flow rate m w Standard of of the cooling medium, and
And a gas flow rate detector for acquiring the EGR standard flow rate m e Standard of .
For example, the temperature sensing assembly in the analog sensing module may employ the same set of temperature sensing assemblies as the on-line testing module, and the pressure sensor in the analog sensing module may employ the same pressure sensor as the on-line testing module. That is, in the above example, the analog detection module is different from the on-line test module in that the analog detection module includes two flow rate detectors, and the on-line test module is obtained by removing the two flow rate detectors.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (13)
1. An EGR flow online detection method of an engine is characterized by comprising the following steps:
S100, enabling an engine to perform simulated operation under N standard states, and obtaining simulated operation parameters of the engine under each standard state, wherein the simulated operation parameters comprise a cooling medium inlet temperature T 1 Standard of , a cooling medium outlet temperature T 2 Standard of , an exhaust gas inlet temperature T 3 Standard of , an exhaust gas outlet temperature T 4 Standard of , a cooling medium flow m w Standard of , an EGR flow m e Standard of and an EGR pressure P Standard of of an EGR cooler, N is an integer more than or equal to 2, and at least one of the operation rotating speed and the load of the engine under each standard state is different;
S200, according to the simulated operation parameters of the engine in each standard state, obtaining cooling medium heat absorption power W w Standard of and waste gas heat dissipation power W e Standard of in each standard state, and according to each cooling medium heat absorption power W w Standard of and each waste gas heat dissipation power W e Standard of , obtaining a correction coefficient delta Standard of between the W w Standard of and the W e Standard of in each standard state;
S300, acquiring the running speed, load and on-line running parameters of the engine in an on-line running state, wherein the on-line running parameters comprise cooling medium inlet temperature T 1 Operation , cooling medium outlet temperature T 2 Operation , exhaust gas inlet temperature T 3 Operation , exhaust gas outlet temperature T 4 Operation , cooling medium flow m w Operation and EGR pressure P Operation of the EGR cooler;
s400, according to the correction coefficient in each standard state, the running rotating speed and load of the engine in the on-line running state and the on-line running parameters, the EGR flow of the engine in the on-line running state is obtained.
2. The EGR flow rate online detection method of an engine according to claim 1, wherein the operating speeds and loads of the N standard states are determined according to the steps of:
Selecting a different standard running speeds;
setting b different standard loads at each operating speed;
Taking one standard running rotating speed and one standard load as a set of standard state parameters, wherein the simulated running of the engine under the standard state refers to the running of the engine under the standard state parameters;
Wherein n=a×b, a and b are each independently selected from integers of ≡1.
3. The method for online detection of EGR flow of an engine according to claim 2, characterized in that the detection method satisfies at least one of the following (1) to (4):
(1) The a different running speeds are distributed in an equidistant gradient mode;
(2) a is an integer greater than or equal to 4;
(3) The magnitudes of the b different loads are distributed in an equidistant gradient manner;
(4) b is an integer greater than or equal to 4.
4. The EGR flow rate online detection method for an engine according to any one of claims 1 to 3, wherein S200 includes the steps of:
Obtaining the W w Standard of in a corresponding standard state according to the T 1 Standard of , the T 2 Standard of , the m w Standard of and the formula (1);
obtaining the W e Standard of in a corresponding standard state according to the T 3 Standard of , the T 4 Standard of , the m w Standard of and the formula (2);
Calculating the delta Standard of according to equation (3);
wherein, the formulas (1) - (3) are as follows:
w w=Cw×mw×（T2-T1) equation (1),
W e=Ce×me×（T3-T4) equation (2),
Delta=w e/Ww formula (3),
In the formulas (1) - (3), T 1 is the temperature of the cooling medium inlet, T 2 is the temperature of the cooling medium outlet, T 3 is the temperature of the exhaust gas inlet, T 4 is the temperature of the exhaust gas outlet, C w is the specific heat capacity of the cooling medium, m w is the flow rate of the cooling medium, C e is the specific heat capacity of the exhaust gas, and m e is the flow rate of the exhaust gas.
5. The EGR flow rate online detection method of an engine according to claim 4, wherein the exhaust specific heat capacity C e Standard of in each standard state is determined by:
Determining the components of the waste gas and the molar content of each component in the corresponding standard state according to the T 3 Standard of or the T 4 Standard of and the P Standard of ;
c e Standard of is obtained according to the formula (4);
Wherein the formula (4) is as follows:
C e=a1×C1+……+an-1×C n-1+an×Cn equation (4),
A 1 and C 1 are the molar content and specific heat capacity of the first component in the exhaust gas, a n-1 and C n-1 are the molar content and specific heat capacity of the n-1 th component in the exhaust gas, respectively, and a n and C n are the molar content and specific heat capacity of the n-th component in the exhaust gas, respectively.
6. The EGR flow rate online detection method of an engine according to claim 5, wherein S400 includes the steps of:
Obtaining a correction relation between the rotating speed and the load and the correction coefficient delta Standard of in the standard state according to the operating rotating speed and the load of the engine in each standard state and the corresponding correction coefficient delta Standard of ;
Interpolating the running speed and load of the engine in the online running state into the correction relation to obtain a corresponding correction coefficient delta Operation ;
Obtaining cooling medium heat absorption power W w Operation in an on-line running state according to the T 1 Operation , the T 2 Operation and the formula (1);
Obtaining waste gas heat dissipation power W e Operation in an on-line running state according to the delta Operation , the W w Operation and the formula (3);
determining the components of the waste gas and the molar content of each component in an on-line running state according to the T 3 Operation or the T 4 Operation and the P Operation , and obtaining C e Operation according to a formula (4);
And obtaining the EGR flow m e Operation of the running state according to the W e Operation , the C e Operation , the T 3 Operation , the T 4 Operation and the formula (2).
7. The method for online detection of EGR flow of an engine according to any one of claims 1 to 3, wherein P Standard of is an inlet pressure or an outlet pressure of exhaust gas in a standard state, and P Operation is an inlet pressure or an outlet pressure of exhaust gas in an online operation state.
8. The method for online detection of EGR flow of an engine according to any one of claims 1 to 3, wherein the m w Operation is obtained by:
Obtaining the corresponding relation between the rotating speed and the load and m Standard of in the standard state according to the operating rotating speed and the load of the engine in each standard state and the corresponding m Standard of ;
And interpolating the running rotating speed and the load of the engine in the online running state into the corresponding relation to obtain the m w Operation .
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method for online detection of EGR flow of an engine according to any one of claims 1-8.
10. A computer-readable storage medium having stored thereon a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the EGR flow rate online detection method of an engine according to any one of claims 1 to 8.
11. An EGR flow rate on-line detection device of an engine, characterized by comprising:
The state parameter acquisition module is used for acquiring the running rotating speed and the load of the engine in the online running state;
An online detection module for testing online operation parameters of the engine, wherein the online operation parameters comprise a cooling medium inlet temperature T 1 Operation , a cooling medium outlet temperature T 2 Operation , an exhaust gas inlet temperature T 3 Operation , an exhaust gas outlet temperature T 4 Operation and an exhaust gas pressure P Operation of the EGR cooler;
a memory storing a computer program, and
A processor implementing the steps of the method for online detection of EGR flow of an engine according to any one of claims 1 to 8 when the processor executes the computer program.
12. The EGR flow rate online detection device of an engine according to claim 11, wherein the online detection module includes:
A temperature detection assembly for testing the T 1 Operation , the T 2 Operation , the T 3 Operation , and the T 4 Operation ;
and a pressure detector for testing the P Operation .
13. The EGR flow rate online detection device of an engine according to claim 11 or 12, characterized in that the EGR flow rate online detection device of an engine further comprises:
the simulation detection module is used for testing simulation operation parameters of the engine in each standard state, wherein the simulation operation parameters comprise cooling medium inlet temperature T 1 Standard of , cooling medium outlet temperature T 2 Standard of , exhaust gas inlet temperature T 3 Standard of , exhaust gas outlet temperature T 4 Standard of , cooling medium standard flow m w Standard of , EGR standard flow m e Standard of and exhaust gas pressure P Standard of of the EGR cooler;
the simulated operation parameters and standard state parameters in the standard states are stored in the memory, and the standard state parameters comprise the operation rotating speed and the load of the engine in the corresponding standard states.
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| CN106017968A (en) * | 2016-07-29 | 2016-10-12 | 无锡隆盛科技股份有限公司 | EGR cooler heat exchange efficiency detection system |
| US11220967B1 (en) * | 2020-10-06 | 2022-01-11 | Garrett Transportation I, Inc. | Mass flow measurement system using adaptive calibration and sensor diagnostics |
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| DE102018205604B3 (en) * | 2018-04-13 | 2019-05-02 | Bayerische Motoren Werke Aktiengesellschaft | Method and apparatus for testing the durability of an EGR cooler for an internal combustion engine |
| CN116378866B (en) * | 2023-05-04 | 2025-07-18 | 潍柴动力股份有限公司 | EGR module pressure sensor detection method and device, vehicle and storage medium |
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| CN106017968A (en) * | 2016-07-29 | 2016-10-12 | 无锡隆盛科技股份有限公司 | EGR cooler heat exchange efficiency detection system |
| US11220967B1 (en) * | 2020-10-06 | 2022-01-11 | Garrett Transportation I, Inc. | Mass flow measurement system using adaptive calibration and sensor diagnostics |
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