CN116498465B - A methanol engine cold start method - Google Patents
A methanol engine cold start methodInfo
- Publication number
- CN116498465B CN116498465B CN202310476765.1A CN202310476765A CN116498465B CN 116498465 B CN116498465 B CN 116498465B CN 202310476765 A CN202310476765 A CN 202310476765A CN 116498465 B CN116498465 B CN 116498465B
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- China
- Prior art keywords
- methanol
- engine
- source device
- heat source
- injection valve
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Classifications
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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
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
- F02M31/04—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating combustion-air or fuel-air mixture
- F02M31/10—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating combustion-air or fuel-air mixture by hot liquids, e.g. lubricants or cooling water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
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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
- F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
- F02M53/02—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means with fuel-heating means, e.g. for vaporising
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a cold starting method of a methanol engine, wherein a heat source device is arranged between a methanol injection valve and an air inlet channel of a cylinder cover, the central axis of the heat source device forms an included angle with the central axis of the methanol injection valve, a hot spot of the heat source device is arranged on the vertex of the included angle, the heat source device is controlled by a program to enter a working state, the methanol injection valve ejects liquid methanol when meeting proper working conditions, the liquid methanol ejected by a nozzle of the methanol injection valve diffuses in a conical shape and completely passes through the hot spot of the heat source device to be gasified into a gaseous state.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a cold starting method of a methanol engine.
Background
When the engine is stopped and cooled and the temperature of the engine and the ambient temperature reach balance, the engine is in a cold state, and the action of restarting the engine is in a cold start.
The method comprises the steps of (1) utilizing a dual-fuel mixed ignition method to not completely use methanol fuel, which is unfavorable for reducing carbon emission, (2) using an ultrasonic atomization method to frequently clean an atomizer to cause complex maintenance when the engine is cold started in cold air environment, (3) adopting a valve-closing injection strategy defining the starting moment of fuel injection, which causes gasified methanol to escape to an exhaust pipe in a scavenging stroke, thereby generating emission pollution and energy waste, and meanwhile, the method for preheating the engine by heating the cooling water of the engine has the problems of long heating time in low temperature environment, which is unfavorable for quick starting of the engine.
Disclosure of Invention
The invention aims to overcome the existing defects, and provides a cold starting method of a methanol engine, which can enable single methanol fuel to be quickly gasified in the cold starting process of the engine to finish cold starting work under the cold air environment condition, and the method for heating cold intake air into hot air through engine high temperature water and gasifying liquid methanol by utilizing the hot air is provided under the engine operation condition, so that normal operation of the methanol engine under the cold air environment condition is ensured, and the problems in the background technology can be effectively solved.
In order to achieve the purpose, the invention provides the technical scheme that a heat source device is arranged between a methanol injection valve and an air inlet channel of a cylinder cover, the central axis of the heat source device and the central axis of the methanol injection valve form an included angle, hot spots of the heat source device are arranged on the top points of the included angles, the heat source device is controlled by a program to enter a working state, the methanol injection valve ejects liquid methanol when meeting proper working conditions, the liquid methanol ejected from a nozzle of the methanol injection valve diffuses in a conical shape and is gasified into a gaseous state through all hot spots of the heat source device, the gaseous methanol is mixed with hot air in an air inlet manifold to form a mixed gas to enter an engine cylinder, the mixed gas is ignited by a spark plug in a combustion chamber to quickly burn before the compression stroke of piston movement is finished, and the methanol injection valve needs to simultaneously meet the following conditions:
Condition 1: the hot spot temperature of the heat source device reaches a set temperature value;
the condition 2 is that the engine speed reaches a set speed value;
condition 3, exhaust valve on cylinder cover of engine is closed state;
condition 4. The intake valve on the cylinder head of the engine is in an open state.
As a preferable technical scheme of the invention, the methanol injection valve is arranged on an intake manifold valve seat, the intake manifold valve seat is arranged on an intake manifold of the composite intake pipe, and the injection central axis of the methanol injection valve coincides with the central axis of an intake passage of the cylinder head.
As a preferable technical scheme of the invention, the nozzle of the methanol injection valve stretches into the inner wall of the intake manifold for a distance of 2 mm.
As a preferable technical scheme of the invention, the heat source device is arranged on the air inlet manifold and is positioned between the nozzle of the methanol injection valve and the air inlet channel of the cylinder cover, and the included angle between the central axis of the heat source device and the central axis of the methanol injection valve is 30 degrees.
As a preferable technical scheme of the invention, the heat source device is operated by direct current, and the hot spot temperature of the heat source device is inversely proportional to the operating current.
As a preferable technical scheme of the invention, in the running condition of the engine, cold intake air is heated into hot air through high-temperature water of the engine, then the hot air is utilized to gasify liquid methanol, the hot air in the intake manifold is from an air cavity, the composite intake pipe comprises an air cavity and a water cavity, the water cavity is mutually isolated from the air cavity, the air cavity is communicated with an air inlet channel of a cylinder cover through the intake manifold, and the water cavity is communicated with cylinder sleeve cooling water outside a cylinder sleeve.
Compared with the prior art, the method has the advantages that (1) the cold air inlet is heated to be hot air through the engine high temperature water, and then the hot air is utilized to gasify the liquid methanol, so that the engine can normally run under the environment condition of the cold air; the invention can ensure that the fuel injected into an air inlet manifold fully enters the cylinder combustion chamber, avoid the problems of energy waste and emission pollution caused by the escape of the methanol fuel into an exhaust pipe in the scavenging stroke, and compared with the method of heating air or methanol in the prior art, the invention ensures that the liquid methanol fuel sprayed out of a nozzle of a methanol injection valve diffuses in a conical shape to pass through a hot spot of a heat source device to be gasified into a gas state quickly, the hot spot temperature is in inverse proportion to the working current, the working current is large in favor of quick temperature rise when the hot spot temperature is low, the working current is small in favor of constant temperature when the hot spot temperature is high, solves the problem that the air inlet valve can not gasify methanol at normal temperature when the engine is started for the first time.
Drawings
FIG. 1 is a schematic diagram of the working structure of the present invention.
In the figure, liquid methanol is 100, an intake manifold valve seat is 101, a methanol injection valve is 102, a conical injection shape is 103, a heat source device is 104, a cylinder cover is 105, an air inlet channel is 106, an intake valve is 107, a combustion chamber is 108, a cylinder sleeve is 109, cylinder sleeve cooling water is 110, a water cavity is 111, an air cavity is 112, and an air cavity is 113 is a composite intake pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments (for convenience of description and understanding, the following description is given with the upper side of fig. 1 as the upper side). All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the invention provides a technical scheme of a cold starting method of a methanol engine, wherein a methanol injection valve 102 is arranged on an air inlet manifold of a composite air inlet pipe 113, the methanol injection valve 102 is arranged on the composite air inlet pipe 113 through an air inlet manifold valve seat 101, an injection central axis of the methanol injection valve 102 coincides with an air inlet port 106 of a cylinder cover 105, a heat source device 104 working by direct current is arranged between the methanol injection valve 102 and the air inlet port 106 of the cylinder cover 105, an included angle is formed between the central axis of the heat source device 104 and the central axis of the methanol injection valve 102, a hot spot of the heat source device 104 is arranged on the top of the included angle, the heat source device 104 can enter a working state when an engine starting button is pressed under program control, the methanol injection valve 102 ejects liquid methanol 100 when working conditions 1-4 are simultaneously met, the hot spot ejected from a nozzle of the methanol injection valve 102 is in a conical shape and is gasified into a gas state, the gas state is mixed with hot air in the air inlet manifold to form a mixed gas, the mixed gas in the gas enters an engine cylinder, the mixed gas is quickly combusted in the combustion chamber 108 before the compression stroke of a piston motion, and the methanol plug is quickly combusted in the combustion chamber 108, and the cold environment is quickly started under cold working condition.
The specific method of the embodiment combined with a single-cylinder engine is as follows:
The composite air inlet pipe 113 is provided with an air cavity 112 and a water cavity 111, when the engine runs, cylinder liner cooling water 110 outside a cylinder liner 109 on the engine can enter the water cavity 111, heat generated in the combustion process of the cylinder combustion chamber 108 enables the cylinder liner cooling water 110 outside the cylinder liner 109 to be hot water and enter the water cavity 111, heat is conducted to the air cavity 112 through the water cavity 111, air in the air cavity 112 of the composite air inlet pipe is heated to hot air by using hot water produced by the self in the running process of the engine, liquid methanol 100 fuel sprayed out of a nozzle of the methanol injection valve 102 is diffused into the hot air in an air inlet manifold in a conical injection shape 103, the hot air is utilized to gasify the liquid methanol 100 to form a mixed gas to enter an engine cylinder, and the mixed gas is ignited by a spark plug to quickly burn in the combustion chamber 108 before the compression stroke of piston movement is finished, so that the engine runs normally under the cold air environment condition.
The nozzle of the methanol injection valve 102 extends into the inner wall of the intake manifold by a distance of 2mm, so that the liquid methanol 100 sprayed by the methanol injection valve 102 cannot be sputtered onto the inner wall of the intake manifold and the inner wall of the intake duct 106 of the cylinder head 105, and the method has the same effect when being applied to a multi-cylinder engine.
The heat source device 104 is installed on the intake manifold and is positioned between the nozzle of the methanol injection valve 102 and the air inlet 106 of the cylinder head 105, the included angle between the central axis of the heat source device 104 and the central axis of the methanol injection valve 102 is 30 degrees, so that all hot spots passing through the heat source device 104 are gasified into a gaseous state when the liquid methanol 100 fuel is diffused in a conical shape 103 after being sprayed out, and the method has the same effect when being applied to a multi-cylinder engine.
In this embodiment, the heat source device 104 operates with 24V dc power, the hot spot temperature of the heat source device 104 is inversely proportional to the operating current, the operating current of the heat source device decreases when the hot spot temperature increases, the operating current of the heat source device increases when the hot spot temperature decreases, and the current of the heat source device does not change when the hot spot temperature does not change;
The working parameter conditions are that the working current value of the heat source device is 10A when the ambient air temperature is 5 ℃, the working current value of the heat source device is 1.7A when the hot spot temperature reference value is 65 ℃, the working current value of the heat source device is 1.0A when the hot spot temperature reference value is 70 ℃, and the control program obtains the hot spot temperature value by a method of monitoring the working current of the heat source device 104.
The following conditions are simultaneously satisfied for the methanol injection valve 102 to inject liquid methanol into the intake manifold:
the hot spot temperature of the heat source device 104 reaches a set temperature value of 70 ℃, and the working current value of the heat source device is 1.0A at the moment, so that the liquid methanol 100 fuel sprayed out of the nozzle of the methanol injection valve 102 is enabled to diffuse in a conical shape 103 to pass through the hot spot of the heat source device 104 to be gasified into a gas state rapidly, compared with the method for heating air or methanol in the prior art, the method is free from the influence of environmental temperature change, is beneficial to popularization and use, and compared with the method for gasifying methanol by utilizing the temperature of the air inlet valve in the prior art, the method can solve the problem that the air inlet valve cannot gasify methanol at normal temperature when the first starting is achieved by controlling the hot spot temperature to be 70 ℃;
the condition 2 is that the rotating speed of the engine reaches 60 percent of the set rated starting rotating speed value of 150r/min, and at the moment, the rotating speed value of the engine is 90r/min, so that the residual gas in the combustion chamber 108 is purged by utilizing the reciprocating motion of the piston to suck the air without the methanol fuel 100 when the engine rotates, the sufficient fresh air in the combustion chamber 108 can be ensured, and the fuel entering the combustion chamber 108 is fully combusted;
Compared with the prior art adopting a valve-closing injection strategy defining the starting moment of oil injection, the invention can ensure that the fuel injected into an intake manifold fully enters the combustion chamber 108, and avoid the problems of energy waste and emission pollution caused by methanol fuel escaping to the exhaust pipe during the scavenging stroke;
condition 4. The intake valve 107 on the cylinder head 105 of the engine is in an open state, so as to ensure that the liquid methanol fuel 100 is quickly gasified into a gaseous state through the hot spot of the heat source device 104, and completely enters the combustion chamber 108 of the engine cylinder with air before the intake valve 107 is closed, and it is understood that the methanol fuel 100 cannot be injected when the intake valve 107 is in the closed state, so that the fuel waste caused by that the gaseous methanol fuel cannot enter the combustion chamber 108 of the engine cylinder is avoided.
The cold start process and method of the present invention are further described with reference to this embodiment, in which the engine temperature and the ambient air temperature reach equilibrium in the cold state of the engine, at this time, the ambient air temperature is 5 ℃, the initial temperature of the cylinder liner water of the engine is 5 ℃, the liquid methanol temperature is 5 ℃, it is easy to understand that the temperature of the device included in embodiment fig. 1 is 5 ℃, when the engine is ready to be started, the hot spot temperature of the heat source device 104 is 5 ℃,24V direct current starts to make the hot spot temperature start to perform rapid temperature rise operation from 5 ℃ with an operating current of 10A, the control program obtains the hot spot temperature by monitoring the operating current of the heat source device 104, obtains a hot spot temperature reference value of 65 ℃ when the operating current value of the heat source device is 1.7A, obtains a hot spot temperature reference value of 70 ℃ when the operating current value of the heat source device is 1.0A, the control program is provided with a hot spot temperature reference value of 65 ℃ and a temperature reference value of 70 ℃, when the engine start button is pressed, the hot spot temperature is lower than 65 ℃ temperature reference, the start motor does not operate, the heat source device 104 continues to perform rapid temperature rise operation, thereby avoiding entering cold air when the engine rotates, and facilitating rapid temperature rise of the hot spot of the heat source device 104; when the hot spot temperature reaches the 65 ℃ temperature reference, the control program enables the starting motor to start to operate so as to drag the engine to rotate, and when the conditions 1-4 cannot be simultaneously met, the liquid methanol 100 fuel is not injected into the intake manifold by the methanol injection valve 102, and for convenience of understanding, a prompt example can be understood as follows:
example 1, when the hot spot temperature does not reach the 70 ℃ temperature reference set in condition 1, and the engine speed does not reach the engine speed 90r/min set in condition 2, the methanol injection valve 102 does not inject liquid methanol 100 fuel into the intake manifold, so that the liquid methanol 100 cannot be gasified and cannot be ignited;
Example 2, when the hot spot temperature reaches the 70 ℃ temperature reference set in condition 1, and the engine speed does not reach the engine speed 90r/min set in condition 2, the methanol injection valve 102 does not inject liquid methanol 100 fuel into the intake manifold, so that the air in the cylinder can be fully ventilated into fresh air;
In example 3, when the hot spot temperature reaches the temperature reference of 70 ℃ set by the condition 1, the engine speed reaches 90r/min set by the condition 2, the exhaust valve is not in the closed state and does not meet the condition 3, the intake valve 107 is in the open state and meets the condition 4, and the methanol injection valve 102 does not inject liquid methanol 100 fuel into the intake manifold, so that the gasified methanol is prevented from being purged to the exhaust pipe to cause fuel waste and pollution.
When the heat source device 104 utilizes 24V direct current to enable the temperature of a hot spot to reach the temperature standard of 70 ℃ set by the condition 1, the engine speed reaches 90r/min set by the condition 2, the exhaust valve is closed to meet the condition 3, the intake valve 107 is opened to meet the condition 4, liquid methanol 100 fuel sprayed out from the nozzle of the methanol injection valve 102 is diffused through the hot spot temperature of the heat source device 104 in a cone shape 103 to be gasified into a gas state, the gas state methanol is mixed with air in an intake manifold to form a mixed gas, the mixed gas enters an engine cylinder, and the mixed gas is ignited by a spark plug to be quickly combusted in the combustion chamber 108 before the compression stroke of piston movement is finished, so that the cold start work of the methanol engine is completed, and the engine is ensured to enter the idle speed 600r/min working operation.
In the running operation of the engine, the method is provided that cold intake air is heated into hot air through engine high temperature water, then the hot air is utilized to gasify the liquid methanol 100, when the conditions 3 and 4 are simultaneously satisfied, the liquid methanol 100 fuel sprayed out from the nozzle of the methanol injection valve 102 is diffused in a conical shape 103 and gasified by the hot air in the intake manifold to form a mixed gas, the mixed gas enters the combustion chamber 108 of the engine cylinder, and the mixed gas is ignited by a spark plug in the combustion chamber 108 to be rapidly combusted before the compression stroke of the piston movement is finished, so that the engine can be ensured to normally run under the condition of cold air.
In a low-temperature environment, the initial temperature of cylinder liner cooling water 110 is 5 ℃, the engine is operated at an idle speed of 600r/min after being started successfully, the temperature of the cylinder liner cooling water 110 is gradually increased from 5 ℃ to become hot water and enter a water cavity 111, the hot water heat in the water cavity 111 is conducted into an air cavity 112 to gradually heat and raise the temperature of 5 ℃ cold air, when the heated temperature of the air is lower than 65 ℃, for example, the temperature of the air is heated to 45 ℃, the hot spot temperature of a heat source device 104 and the working current are in inverse proportion, the low-temperature working current of the heat source device 104 greatly keeps the hot spot temperature at 70 ℃, when the conditions 3 and 4 are simultaneously met, the liquid methanol 100 fuel sprayed out from a nozzle of a methanol injection valve 102 is continuously gasified into a gaseous state by the hot spot temperature, the gaseous methanol is mixed with the air in an air inlet manifold to form a mixed gas to enter an engine cylinder, the mixed gas is rapidly combusted in a combustion chamber 108 by a spark plug before the end of a compression stroke of piston motion, the problem that the engine is heated by the low-temperature of the cold air in the water cavity is solved when the water temperature of the engine is operated at a low power, and the idle speed of 600r/min is ensured.
Further, when the temperature of the cylinder liner water gradually rises to be higher than 65 ℃, the hot water heat in the water cavity 111 is conducted into the air cavity 112 to heat the cold air at 5 ℃ to be the hot air which cannot reach 65 ℃, the heat source device 104 keeps the hot spot temperature at 65 ℃ by using the working current of 1.7A, when the condition 3 and the condition 4 are met, the liquid methanol 100 fuel sprayed out from the nozzle of the methanol injection valve 102 is gasified into gas by the hot air in the air inlet manifold and the hot spot temperature simultaneously to form mixed gas which enters the engine cylinder, the mixed gas is ignited by the spark plug in the combustion chamber 108 to be quickly combusted before the compression stroke of the piston movement is finished, the purpose that the cold air in the air cavity 112 is heated by utilizing the self-generated hot water in the engine operation process is achieved, the engine operation in a low-temperature environment is ensured, and compared with the prior art, cold and hot impact caused by the fact that the temperature difference between the air inlet temperature and the normal working temperature of the engine is too large in the low-temperature environment can be avoided, and the service life of the engine is prolonged.
Further, after the cylinder liner water temperature gradually rises to 80 ℃ of the cylinder liner water temperature at which the engine works normally, the hot water heat in the water cavity 111 is conducted to the air cavity 112 to heat the 5 ℃ cold air into 65 ℃ hot air, it is easy to understand that the hot spot temperature of the heat source device 104 is heated to 65 ℃ by the hot air, the working current of the heat source device 104 is reduced to a hot spot unheated state by utilizing the effect that the hot spot temperature of the heat source device 104 and the working current are in inverse proportion, when the conditions 3 and 4 are met, the liquid methanol 100 fuel sprayed out from the nozzle of the methanol injection valve 102 is diffused in a conical shape 103 to be gasified in the 65 ℃ hot air in the air inlet manifold to form a mixed gas, the mixed gas enters the combustion chamber 108, and the mixed gas is ignited by the spark plug in the combustion chamber 108 to burn quickly before the compression stroke of the piston motion is ended, so that the normal operation of the methanol engine is completed.
Under program control, the heat source device 104 is put into operation when the engine is ready to start, is kept in operation during normal operation of the engine, and is stopped when the engine is stopped.
When the engine is operated at high power, the interior Shui Wengao of the water cavity 111 is fully heated for air, and at the moment, the hot spot temperature of the heat source device 104 is high, the resistance is high, the heat generated by the small current is small, and the liquid methanol 100 fuel sprayed out from the nozzle of the methanol injection valve 102 is gasified by the hot air in the intake manifold.
When the engine is operated at high power, the interior Shui Wengao of the water cavity 111 is fully heated with air, and at the moment, the hot spot temperature of the heat source device 104 is high, the heat generated by small current is small, and the liquid methanol 100 fuel sprayed out from the nozzle of the methanol injection valve 102 is gasified by the hot air in the intake manifold.
In the high temperature environment embodiment, hot water can be controlled not to enter the water cavity 111, so that air can not be heated when the engine works in the high temperature environment.
Example 2 the difference from example 1 is that the heat source device in the cold start method can use alternating current as well.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A cold starting method of a methanol engine is characterized in that a heat source device (104) is arranged between a methanol injection valve (102) and an air inlet channel (106) of a cylinder cover (105), an included angle is formed between the central axis of the heat source device (104) and the central axis of the methanol injection valve (102), a hot spot of the heat source device (104) is arranged on the top of the included angle, the heat source device (104) is controlled by a program to enter a working state, the methanol injection valve (102) ejects liquid methanol (100) when meeting proper working conditions, the liquid methanol (100) ejected by the nozzle of the methanol injection valve (102) diffuses in a conical shape and is gasified to be in a gaseous state through the hot spot of the heat source device (104), the gaseous methanol is mixed with hot air in an air inlet manifold to form a mixed gas into an engine cylinder, the mixed gas is ignited by a spark plug in a combustion chamber (108) before the compression stroke of a piston is finished, the methanol engine is rapidly started in a cold air environment, and the methanol injection valve (102) needs to inject the liquid methanol into the air inlet manifold to meet the following conditions simultaneously:
condition 1, hot spot temperature of the heat source device (104) reaches a set temperature value;
The condition 2 is that the engine speed reaches a set speed value;
Condition 3, exhaust valve on cylinder head (105) of engine is closed state;
condition 4. The intake valve (107) on the cylinder head (105) of the engine is in an open state.
2. A cold start method of a methanol engine according to claim 1, characterized in that the methanol injection valve (102) is mounted on an intake manifold valve seat (101), the intake manifold valve seat (101) is provided on an intake manifold of a composite intake pipe (113), and an injection center axis of the methanol injection valve (102) coincides with an intake port (106) center axis of a cylinder head (105).
3. A cold start method of a methanol engine as set forth in claim 1, wherein the nozzle of the methanol injection valve (102) extends into the inner wall of the intake manifold by a distance of 2 mm.
4. A cold start method of a methanol engine as set forth in claim 1, wherein the heat source device (104) is mounted on the intake manifold and located between the nozzle of the methanol injection valve (102) and the intake port (106) of the cylinder head (105), and the center axis of the heat source device (104) is at an angle of 30 DEG to the center axis of the methanol injection valve (102).
5. A cold start method of a methanol engine as set forth in claim 1, wherein the heat source device (104) is operated by direct current, and a hot spot temperature of the heat source device (104) is inversely proportional to an operating current.
6. A cold start method of a methanol engine according to claim 2, characterized in that, in the engine operation mode, cold intake air is heated to hot air by engine high temperature water, then the hot air is used for gasifying liquid methanol, the hot air in the intake manifold is from an air cavity (112), the composite intake pipe (113) comprises the air cavity (112) and a water cavity (111), the water cavity (111) is isolated from the air cavity (112), the air cavity (112) is communicated with an intake channel (106) of a cylinder head (105) through the intake manifold, and the water cavity (111) is communicated with cylinder liner cooling water (110) outside a cylinder liner (109).
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| CN202310476765.1A CN116498465B (en) | 2023-04-28 | 2023-04-28 | A methanol engine cold start method |
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| CN114704393A (en) * | 2022-04-18 | 2022-07-05 | 潍柴动力股份有限公司 | Cold start method of diesel-methanol dual-fuel engine and related hardware |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2573817B1 (en) * | 1984-11-26 | 1987-02-13 | Renault | COLD STARTING DEVICE FOR ALCOHOL ENGINES |
| AT395265B (en) * | 1989-06-20 | 1992-11-10 | Avl Verbrennungskraft Messtech | Cold starting device for internal combustion engines powered by alcohol fuel |
| JPH05209579A (en) * | 1992-01-31 | 1993-08-20 | Mazda Motor Corp | Fuel heating device for alcohol engine |
| CN1327121C (en) * | 2002-12-05 | 2007-07-18 | 天津大学 | Methane fuel engine with very low discharge |
| CN100572793C (en) * | 2007-07-31 | 2009-12-23 | 奇瑞汽车股份有限公司 | A kind of methanol fuel engine fuel oil jet system and controlling method thereof |
| JP2009036151A (en) * | 2007-08-03 | 2009-02-19 | Nissan Motor Co Ltd | Starter for internal combustion engine |
| CN106762179B (en) * | 2016-12-29 | 2020-03-31 | 浙江吉利控股集团有限公司 | Methanol engine cold start control system and method for vehicle |
| CN111058976A (en) * | 2019-12-18 | 2020-04-24 | 杨记 | Methanol automobile intake air heating and methanol automobile oil pump protection method |
| CN115653748B (en) * | 2022-10-27 | 2025-01-21 | 玉柴联合动力股份有限公司 | A methanol and natural gas dual-fuel engine and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114704393A (en) * | 2022-04-18 | 2022-07-05 | 潍柴动力股份有限公司 | Cold start method of diesel-methanol dual-fuel engine and related hardware |
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