CN103821919B - The cooling flow controlling method of dual-clutch transmission and system - Google Patents
The cooling flow controlling method of dual-clutch transmission and system Download PDFInfo
- Publication number
- CN103821919B CN103821919B CN201410098269.8A CN201410098269A CN103821919B CN 103821919 B CN103821919 B CN 103821919B CN 201410098269 A CN201410098269 A CN 201410098269A CN 103821919 B CN103821919 B CN 103821919B
- Authority
- CN
- China
- Prior art keywords
- cooling flow
- cooling
- clutch
- flow rate
- gearbox
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 365
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000005540 biological transmission Effects 0.000 title claims abstract description 34
- 238000005070 sampling Methods 0.000 claims abstract description 52
- 230000009977 dual effect Effects 0.000 claims description 27
- 230000036962 time dependent Effects 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 abstract description 8
- 230000002411 adverse Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000004907 flux Effects 0.000 abstract 1
- 238000004781 supercooling Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 230000002829 reductive effect Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012809 cooling fluid Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps; Pressure control
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
The invention discloses a kind of cooling flow controlling method and system of dual-clutch transmission, method comprises: obtain the work of slipping of first clutch, the work of slipping of second clutch, gearbox-gear, the speed of a motor vehicle and gas pedal aperture every the sampling period of setting; According to the work of slipping of the work of slipping of first clutch, second clutch, gearbox-gear, the speed of a motor vehicle and gas pedal aperture, obtain the expectation cooling flow flowing through the cooling oil of double clutch; Adjust flux valve, and make the flow of the cooling oil of double clutch and expect that the difference of cooling flow is in the margin of error set.This patent utilizes the gentle gearshift of clutch work of slipping, double clutch oil temperature and gear box oil jointly to determine the double clutch cooling flow expected, the cooling flow that take into account system all sidedly controls the equilibrium relation with lubrication, be conducive to according to actual conditions, rightly for double clutch provides appropriate cooling flow, avoid supercooling and lubricate insufficient adverse effect.
Description
Technical Field
The invention relates to the technical field of automatic transmissions of automobiles, in particular to a cooling flow control method and system of a double-clutch automatic transmission.
Background
A typical wet type double clutch automatic gearbox mainly comprises hardware such as an oil pump, a wet type double clutch, an electronic control system, a hydraulic system, gears and the like. The wet-type double-clutch automatic transmission comprises a first clutch (also called an outer clutch), a second clutch (also called an inner clutch), an outer input shaft and an inner input shaft, wherein the outer input shaft connected with the first clutch controls odd gears, the inner input shaft connected with the second clutch controls even gears and reverse gears, and the combination and the separation of the gears are controlled by an electronic control system and a hydraulic system. During gear shifting, one clutch removes power from the engaged gear while the other clutch removes power from the pre-engaged gear. The continuous power transmission is realized through the alternate work of the first clutch and the second clutch, and the gear shifting device has the advantages of smooth gear shifting, high efficiency and good comfort.
At present, the wet-type double-clutch automatic gearbox does not have the function of cooling flow control aiming at double clutches, and the working condition of actual operation of the whole vehicle cannot be considered. However, in the normal driving process of the whole vehicle, when the engine speed is stabilized at a certain speed, the total oil output amount of the oil pump is constant, that is, the total amount of the cooling oil flowing through the dual clutch and the cooling oil flowing through the gear is constant, when the flow rate of the cooling oil flowing through the dual clutch is increased, the flow rate of the cooling oil flowing through the gear is relatively reduced, if the flow rate distribution is performed without considering the actual operation condition of the whole vehicle, the amount of the cooling oil distributed to the dual clutch is too small or the amount of the cooling oil distributed to the gear is too small, so that the degree of sliding friction between the driving disc and the driven disc of the first clutch or the second clutch is likely to be large, or the lubrication of the gear is insufficient, the service lives of the clutch and the gear are affected, and the safety of the driving of the whole vehicle is reduced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a cooling flow control method and a cooling flow control system for a double-clutch automatic gearbox.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a cooling flow control method of a double clutch automatic gearbox comprises the following steps:
acquiring the sliding grinding work of the first clutch, the sliding grinding work of the second clutch, the gear of a gearbox, the vehicle speed and the opening degree of an accelerator pedal at intervals of a set sampling period;
acquiring the expected cooling flow of the cooling oil flowing through the double clutches according to the sliding friction work of the first clutch, the sliding friction work of the second clutch, the gear position of the gearbox, the vehicle speed and the opening degree of an accelerator pedal;
and adjusting a flow valve, and enabling the difference between the flow rate of the cooling oil of the double clutch and the expected cooling flow rate to be within a set error range.
Preferably, the acquiring of the desired cooling flow rate of the cooling oil flowing through the dual clutch includes:
acquiring a first cooling flow of cooling oil flowing through the double clutches according to the sliding friction work of the first clutch and the sliding friction work of the second clutch;
acquiring a second cooling flow of the cooling oil flowing through the double clutches according to the gear position of the gearbox, the vehicle speed and the opening degree of an accelerator pedal;
determining a quasi-desired cooling flow rate and making the quasi-desired cooling flow rate a maximum of the first cooling flow rate and the second cooling flow rate;
and performing limit processing on the quasi-expected cooling flow, and determining the quasi-expected cooling flow after limit processing as the expected cooling flow of the cooling oil flowing through the double clutches.
Preferably, the acquiring of the second cooling flow rate of the cooling oil flowing through the dual clutch includes:
acquiring a target gear of the gearbox according to the vehicle speed and the opening degree of an accelerator pedal;
judging whether the gear of the gearbox is equal to the target gear or not;
if not, performing gear shifting operation and determining that the second cooling flow is 0;
and if so, determining the second cooling flow according to all the second cooling flows determined in the set time period before the current sampling moment and the set relation curve of the flow changing along with the time.
Preferably, the determining the second cooling flow rate according to all the second cooling flow rates determined in the set time period before the current sampling time and the set time-dependent change relationship curve of the flow rates includes:
according to all second cooling flows in a set time period before the current sampling moment, finding a first moment of the second cooling flows determined at the previous sampling moment corresponding to the current sampling moment on the relation curve;
determining a second time and enabling the second time to be equal to the first time plus the set sampling period;
and determining that the second cooling flow rate is equal to the flow rate on the relation curve corresponding to the second moment.
Preferably, the relationship curve is a trapezoidal wave.
Preferably, the determining of the quasi-desired cooling flow specifically includes:
acquiring the temperature of the cooling oil flowing through the double clutches and the temperature of the cooling oil flowing through the gears of the gearbox at intervals of the set sampling period;
acquiring a third cooling flow of the cooling oil flowing through the double clutch according to the temperature of the cooling oil flowing through the double clutch and the temperature of the cooling oil flowing through the transmission gear;
determining the quasi-desired cooling flow as a maximum of the first cooling flow, the second cooling flow, and the third cooling flow.
A cooling flow control system for a twin clutch automatic transmission comprising:
the data acquisition unit is used for acquiring the sliding friction work of the first clutch, the sliding friction work of the second clutch, the gear of the gearbox, the vehicle speed and the opening degree of an accelerator pedal at intervals of a set sampling period;
the expected cooling flow determining unit is used for acquiring the expected cooling flow of the cooling oil flowing through the double clutches according to the sliding friction work of the first clutch, the sliding friction work of the second clutch, the gear position of the gearbox, the vehicle speed and the opening degree of an accelerator pedal;
and the adjusting unit is used for adjusting a flow valve and enabling the difference between the flow rate of the cooling oil of the double clutches and the expected cooling flow rate to be within a set error range.
Preferably, the desired cooling flow rate determination unit includes:
the first cooling flow determining unit is used for acquiring a first cooling flow of the cooling oil flowing through the double clutches according to the sliding friction work of the first clutch and the sliding friction work of the second clutch;
the second cooling flow determining unit is used for acquiring a second cooling flow of the cooling oil flowing through the double clutches according to the gear position of the gearbox, the vehicle speed and the opening degree of an accelerator pedal;
a quasi-desired cooling flow rate determination unit configured to determine a quasi-desired cooling flow rate and make the quasi-desired cooling flow rate a maximum value of the first cooling flow rate and the second cooling flow rate;
and the limit value processing unit is used for carrying out limit value processing on the quasi-expected cooling flow and determining the quasi-expected cooling flow after the limit value processing as the expected cooling flow of the cooling oil flowing through the double clutches.
Preferably, the second cooling flow rate determining unit includes:
the target gear determining unit is used for acquiring a target gear of the gearbox according to the vehicle speed and the opening degree of an accelerator pedal;
the gear shifting judging unit is used for judging whether the gear of the gearbox is equal to the target gear or not;
a first determination unit configured to determine that the second cooling flow rate is 0 when the transmission gear is not equal to the target gear;
and the second determining unit is used for determining the second cooling flow according to all the second cooling flows determined in a set time period before the current sampling moment and a set relation curve of the change of the flow along with time under the condition that the gear position of the gearbox is equal to the target gear position.
Preferably, the second determination unit includes:
the first time determining unit is used for finding out a first time of a second cooling flow determined at a previous sampling time corresponding to the current sampling time on the relation curve according to all second cooling flows in a set time period before the current sampling time;
a second time determination unit, configured to determine a second time, and make the second time equal to the first time plus the set sampling period;
and a third determination unit configured to determine that the second cooling flow rate is equal to a flow rate on the relationship curve corresponding to the second time.
Preferably, the relationship curve is a trapezoidal wave.
Preferably, the data acquisition unit is further configured to: acquiring the temperature of the cooling oil flowing through the double clutches and the temperature of the cooling oil flowing through the gears of the gearbox at intervals of the set sampling period;
the system also comprises a third cooling flow determining unit, a second cooling flow determining unit and a control unit, wherein the third cooling flow determining unit is used for acquiring a third cooling flow of the cooling oil flowing through the double clutches according to the temperature of the cooling oil flowing through the double clutches and the temperature of the cooling oil flowing through the gears of the gearbox;
the quasi-desired cooling flow determination unit is specifically configured to: determining the quasi-desired cooling flow as a maximum of the first, second, and third cooling flows.
The cooling flow control method of the double-clutch automatic gearbox has the beneficial effects that:
(1) the expected cooling flow of the double clutches is determined by utilizing the three aspects of the clutch sliding power, the oil temperature of the double clutches, the oil temperature of the gearbox and the gear shifting state, the balance relation between the cooling flow control and the lubrication of the system is comprehensively considered, the proper cooling flow is favorably provided for the double clutches according to the actual situation, and the adverse effects of excessive cooling and insufficient lubrication are avoided;
(2) the gear shifting device has the advantages that sufficient gear shifting pressure is provided in the gear shifting process, and the influence of clutch cooling flow control on the gear shifting pressure in the gear shifting process is avoided;
(3) the service life of the double clutch is prolonged, and the safety of the gearbox and the whole vehicle driving is improved.
Drawings
FIG. 1 is a flow chart illustrating a method for controlling cooling flow of a twin clutch automatic transmission according to an embodiment of the present invention;
FIG. 2 illustrates a flow chart for capturing the flow of cooling oil through the dual clutch in an embodiment of the present invention;
FIG. 3 illustrates a flow chart for obtaining a second cooling flow of cooling oil through the dual clutch according to an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a relationship curve in an embodiment of the invention;
FIG. 5 illustrates a flow chart for determining the second cooling flow rate in an embodiment of the present invention;
FIG. 6 illustrates a flow chart for determining a quasi-desired cooling flow in an embodiment of the present invention;
FIG. 7 is a schematic structural diagram illustrating a cooling flow control system of the twin clutch automatic transmission according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram showing a desired cooling flow determination unit in the embodiment of the invention;
fig. 9 is a schematic configuration diagram showing a second cooling flow rate determining unit in the embodiment of the invention;
fig. 10 shows a schematic configuration diagram of the second determination unit in the embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
According to the cooling flow control method of the automatic double-clutch transmission, the expected cooling flow of the double clutches is determined by utilizing the clutch sliding power, the oil temperature of the double clutches, the oil temperature of the transmission and the gear shifting state, the balance relation between the cooling flow control and the lubrication of the system is comprehensively considered, the appropriate cooling flow is favorably provided for the double clutches according to the actual situation, and the adverse effects of excessive cooling and insufficient lubrication are avoided.
As shown in fig. 1, the method for controlling cooling flow of a dual clutch automatic transmission according to an embodiment of the present invention includes the following steps:
step 101: and acquiring the sliding abrasion work of the first clutch, the sliding abrasion work of the second clutch, the gear of the gearbox, the vehicle speed and the opening degree of the accelerator pedal at intervals of a set sampling period.
Specifically, first, the formula for calculating the slip work of the clutch is well known to those skilled in the art, belongs to the prior art, and is not described in detail herein. In addition, the gear position of the gearbox can be directly read from a gearbox controller, the vehicle speed can be read from a vehicle control unit, and the opening degree of an accelerator pedal can be obtained through a position sensor arranged at the accelerator pedal.
Step 102: and acquiring the expected cooling flow of the cooling oil flowing through the double clutches according to the sliding friction work of the first clutch, the sliding friction work of the second clutch, the gear position of the gearbox, the vehicle speed and the opening degree of an accelerator pedal.
Specifically, the method for obtaining the desired cooling flow rate of the cooling oil flowing through the dual clutch according to the obtained five parameters, such as the sliding friction work of the first clutch, will be described in detail with reference to fig. 2.
Step 103: and adjusting a flow valve, and enabling the difference between the flow rate of the cooling oil of the double clutch and the expected cooling flow rate to be within a set error range.
Specifically, after the expected cooling flow rate of the cooling oil flowing through the dual clutch is obtained, the system may adjust a flow valve for controlling the flow rate of the cooling oil flowing through the dual clutch, and gradually adjust the flow rate (which may be read by a flow meter) of the cooling oil flowing through the dual clutch to the expected cooling flow rate, and the specific adjustment method may adopt a proportional adjustment method, an integral adjustment method, a differential adjustment method, a PID adjustment method, and the like, and the adjustment method is a control method conventionally adopted by those skilled in the art and is not described herein any more, and parameters related to the control method may be adjusted according to specific requirements. In addition, the skilled person can set the corresponding error range according to the specific requirements.
As shown in fig. 2, which is a flowchart illustrating an embodiment of the present invention for obtaining a flow rate of the cooling oil flowing through the dual clutch, the obtaining of the desired cooling flow rate of the cooling oil flowing through the dual clutch includes the following steps:
step 201: and acquiring a first cooling flow of the cooling oil flowing through the double clutches according to the sliding friction work of the first clutch and the sliding friction work of the second clutch.
Specifically, the first cooling flow is preferably obtained by a look-up table, which includes a two-dimensional table of the sliding friction work of the first clutch and the corresponding relationship between the sliding friction work of the second clutch and the first cooling flow, which is well known to those skilled in the art and can be calibrated by a limited number of experiments, and will not be described herein again.
Step 202: and acquiring a second cooling flow of the cooling oil flowing through the double clutches according to the gear position of the gearbox, the vehicle speed and the opening degree of the accelerator pedal.
Specifically, the method for obtaining the second cooling flow rate of the cooling oil flowing through the double clutches according to the gear position of the gearbox, the vehicle speed and the opening degree of the accelerator pedal is described in detail below with reference to fig. 3 to 5.
Step 203: a quasi-desired cooling flow rate is determined and made the maximum of the first and second cooling flows.
Step 204: and performing limit processing on the quasi-expected cooling flow, and determining the quasi-expected cooling flow after limit processing as the expected cooling flow of the cooling oil flowing through the double clutches.
Specifically, first, the method of limiting the desired cooling flow rate includes:
judging whether the quasi-expected cooling flow is greater than or equal to a set cooling flow lower limit and less than or equal to a set cooling flow upper limit, if so, determining the quasi-expected cooling flow as the quasi-expected cooling flow processed by the limit value;
when the quasi-expected cooling flow is larger than the set upper limit of the cooling flow, determining the quasi-expected cooling flow after limit processing as the upper limit of the cooling flow;
and when the quasi-expected cooling flow is smaller than the set lower cooling flow limit, determining the quasi-expected cooling flow after limit processing as the lower cooling flow limit. In particular, the upper cooling flow rate limit is preferably 23L/min, and the lower cooling flow rate limit is preferably 0L/min.
And determining the limit-processed quasi-expected cooling flow, namely determining the limit-processed quasi-expected cooling flow as the expected cooling flow of the cooling oil flowing through the double clutch.
In this embodiment, the maximum value between the first cooling flow and the second cooling flow is taken as the quasi-expected cooling flow, so that the degree of sliding between the driving disc and the driven disc of the first clutch or the second clutch can be fully ensured, and the actual operation condition of the whole vehicle is considered.
As shown in fig. 3, the flowchart is a flowchart for acquiring a second cooling flow rate of the cooling oil flowing through the dual clutch according to the embodiment of the present invention, where the acquiring the second cooling flow rate of the cooling oil flowing through the dual clutch includes the following steps:
step 301: and acquiring a target gear of the gearbox according to the vehicle speed and the opening degree of the accelerator pedal.
Specifically, the target gear of the transmission is preferably obtained by a look-up table, wherein the two-dimensional table includes a corresponding relationship between a vehicle speed and an accelerator pedal opening and the target gear of the transmission, which is well known to those skilled in the art, and can be calibrated through a limited number of experiments, and is not described herein again.
Step 302: and judging whether the gear of the gearbox is equal to the target gear or not.
Specifically, the states of two clutches are considered for judging whether the double-clutch gearbox needs to shift gears, and if the first clutch is responsible for transmitting torque at present, the gear of the first clutch is determined to be the gear of the double-clutch gearbox, namely the gear of the gearbox; similarly, if the second clutch is currently responsible for transmitting torque, the gear of the second clutch is determined to be the gear of the dual clutch transmission, i.e. the transmission gear.
Step 303: and if the gear of the gearbox is not equal to the target gear, performing gear shifting operation, and determining that the second cooling flow is 0.
Specifically, when the gear of the gearbox is not equal to the target gear, that is, when the current dual-clutch gearbox needs to shift gears, a gear shifting operation is performed, so that the gear of the gearbox is switched to the target gear, and meanwhile, the second cooling flow is set to 0. Due to the fact that gear shifting is needed, the degree of sliding friction of a driving disc and a driven disc of the first clutch or the second clutch is increased, the system completely considers the degree of sliding friction at the moment, a large amount of cooling oil is conveyed to a cooling branch of the double clutch, the degree of sliding friction and heat generated by the sliding friction are effectively reduced, and the service life of the double clutch is prolonged; meanwhile, the method is favorable for having enough gear shifting pressure in the gear shifting process, and avoids the influence of the cooling flow control of the clutch on the gear shifting pressure in the gear shifting process.
Step 304: and if the gear of the gearbox is equal to the target gear, determining the second cooling flow according to all the second cooling flows determined in a set time period before the current sampling moment and a set relation curve of the flow changing along with time.
Specifically, when the gearbox gear with the target gear is equal, the system can suitably reduce the flow of the cooling oil of the double-clutch cooling branch, so that the flow of the cooling oil flowing through the gearbox gear can be suitably increased, and the lubricating effect of the gearbox gear is guaranteed on the basis of guaranteeing the degree of friction of the clutch. In addition, a method of determining the second cooling flow rate will be described in detail below with reference to fig. 4 and 5.
Fig. 4 is a schematic diagram of a relation curve obtained through long-term tests by the inventor in order to obtain a proper expected cooling flow rate to meet system requirements in the embodiment of the invention. Specifically, the relation curve is a set of trapezoidal waves, the abscissa represents the flow rate, the minimum value of the flow rate at the time t is 0L/min, the rising time from the minimum value to the maximum value of 4L/min is 1.5s, then the maximum value is maintained for 1s, then the flow rate falls from the maximum value of 4L/min to 0L/min, the falling time is 1.5s, the minimum value is maintained for 1s, then the rising from the minimum value to the maximum value is performed, and the like.
As shown in fig. 5, which is a flowchart of determining the second cooling flow rate in the embodiment of the present invention, the determining the second cooling flow rate according to all the second cooling flow rates determined in the set time period before the current sampling time and the set time-dependent relationship curve of the flow rates includes the following steps:
step 401: and finding out the first moment of the second cooling flow determined by the previous sampling moment corresponding to the current sampling moment on the relation curve according to all the second cooling flows in a set time period before the current sampling moment. In particular, the set period of time should be greater than the time during which the relationship maintains the same value.
Step 402: determining a second time and enabling the second time to be equal to the first time plus the set sampling period;
step 403: and determining that the second cooling flow rate is equal to the flow rate on the relation curve corresponding to the second moment.
The following illustrates the determination process of the second cooling flow rate, for example, the time period is set to 1.5s, the sampling period is set to 0.5s, and if all the second cooling flow rates determined within 1.5s before the current sampling time are obtained to be 0, it can be seen from the relationship curve shown in fig. 4 that the last sampling time of the current sampling time corresponds to the time t in the relationship curve, so that the time t +0.5 in the relationship curve corresponding to the current sampling time can be inferred, and then the flow rate corresponding to the time t +0.5 in the relationship curve can be obtained according to the correlation calculation formula of the similar triangle to be 4/3L/min, that is, the second cooling flow rate at the current sampling time is determined to be 4/3L/min.
In another embodiment of the invention, in the process of calculating the expected cooling flow, not only the influence of the clutch sliding power and the gear shifting state is considered, but also the influence of the temperature of the double clutches and the temperature of the gearbox is considered, so that the obtained expected cooling flow is more consistent with the actual working condition of the whole vehicle running.
As shown in fig. 6, it is a flowchart of determining a quasi-expected cooling flow rate in another preferred embodiment of the present invention, and the method for determining a quasi-expected cooling flow rate specifically includes the following steps:
step 501: and acquiring the temperature of the cooling oil flowing through the double clutches and the temperature of the cooling oil flowing through the gears of the gearbox at intervals of the set sampling period.
In detail, in order to obtain the temperature of the cooling oil flowing through the double clutches, the temperature sensors are arranged on the outer shell corresponding to the left lower side edge (seen from the gearbox to the axial direction of the engine) of the double clutches, uniform small holes are distributed on the periphery of the outer part of the double clutches, the cooling oil flowing through the double clutches can be sputtered on the temperature sensors during working rotation, and the temperature of the cooling oil flowing through the double clutches, which is also called as the temperature of the double clutches, is acquired by the temperature sensors; similarly, for the temperature of the cooling fluid of acquireing the gearbox gear of flowing through, temperature sensor sets up on the main casing inner wall of gearbox oil casing bottom (from the gearbox toward engine axial direction, the oil pan is located the gearbox left side), and this temperature sensor soaks in fluid always, and temperature sensor can gather the temperature of the cooling fluid of the gearbox gear of flowing through from this, also is called the gearbox temperature.
Step 502: and acquiring a third cooling flow of the cooling oil flowing through the double clutch according to the temperature of the cooling oil flowing through the double clutch and the temperature of the cooling oil flowing through the transmission gear.
Specifically, the temperature difference between the temperature of the cooling oil flowing through the dual clutch and the temperature of the cooling oil flowing through the transmission gear is first calculated, and then the third cooling flow is obtained, preferably by looking up a table, wherein a one-dimensional table containing the corresponding relationship between the temperature difference and the third cooling flow is well known to those skilled in the art, and can be calibrated through limited experiments, and details are not repeated herein.
Step 503: determining the quasi-desired cooling flow as a maximum of the first, second, and third cooling flows.
In this embodiment, the maximum value among the first cooling flow, the second cooling flow and the third cooling flow is taken as the quasi-expected cooling flow, so that the degree of sliding between the driving disk and the driven disk of the first clutch or the second clutch can be fully ensured, and the actual operation conditions of the whole vehicle are considered, specifically including the gear shifting state, the temperature of the double clutches and the temperature of the gearbox.
In summary, the cooling flow control method for the wet-type dual-clutch automatic transmission according to the embodiment of the invention determines the expected cooling flow of the dual clutches by utilizing the clutch sliding power, the oil temperature of the dual clutches, the oil temperature of the transmission and the gear shifting state, comprehensively considers the balance relation between the cooling flow control and the lubrication of the system, is beneficial to providing proper cooling flow for the dual clutches according to the actual situation, and avoids the adverse effects of excessive cooling and insufficient lubrication.
Specifically, the cooling flow of the double clutch needs to be adjusted according to actual working conditions, under the working conditions of starting under a large load, long-time uphill and the like, the double clutch is often in a sliding grinding working state, a large amount of heat can be generated, and at the moment, the cooling flow needs to be increased to protect the double clutch; under suburban conditions, the gear shifting frequency is low, the heat generated by the double clutches is low, and the cooling flow aiming at the double clutches can be properly reduced. Therefore, the cooling flow of the double clutches is controlled according to the actual working condition, and the service lives of the clutches and the gearboxes are prolonged.
In addition, the cooling flow control method of the wet double-clutch automatic gearbox determines the cooling flow of the clutch through the gear detection state, is favorable for having enough gear shifting pressure in the gear shifting process, and avoids the influence of the cooling flow control of the clutch on the gear shifting pressure in the gear shifting process.
Furthermore, the cooling flow control method of the wet double-clutch automatic gearbox prolongs the service life of the double clutches and improves the safety of the gearbox and the whole vehicle driving.
Correspondingly, the embodiment of the invention also provides a cooling flow control system of the double-clutch automatic transmission, which is shown in fig. 7 and is a structural schematic diagram of the system.
In this embodiment, the cooling flow control system of the twin clutch automatic transmission includes:
the data acquisition unit 601 is used for acquiring the sliding friction work of the first clutch, the sliding friction work of the second clutch, the gear of the gearbox, the vehicle speed and the opening degree of an accelerator pedal at intervals of a set sampling period;
an expected cooling flow determining unit 602, configured to obtain an expected cooling flow of the cooling oil flowing through the dual clutches according to the sliding friction work of the first clutch, the sliding friction work of the second clutch, the gear of the transmission, the vehicle speed, and the opening degree of the accelerator pedal;
and the adjusting unit 603 is used for adjusting a flow valve, and making the difference between the flow rate of the cooling oil of the double clutches and the expected cooling flow rate within a set error range.
Fig. 8 is a schematic structural diagram of a desired cooling flow determination unit 602 according to an embodiment of the present invention. The desired cooling flow rate determination unit 602 includes:
a first cooling flow determining unit 701, configured to obtain a first cooling flow of the cooling oil flowing through the dual clutch according to the sliding friction work of the first clutch and the sliding friction work of the second clutch;
a second cooling flow determining unit 702, configured to obtain a second cooling flow of the cooling oil flowing through the dual clutch according to the transmission gear, the vehicle speed, and the accelerator pedal opening;
a quasi-desired cooling flow rate determination unit 703 for determining a quasi-desired cooling flow rate and making the quasi-desired cooling flow rate be the maximum value of the first cooling flow rate and the second cooling flow rate;
a limiting unit 704, configured to limit the quasi-expected cooling flow rate, and determine the limited quasi-expected cooling flow rate as the expected cooling flow rate of the cooling oil flowing through the dual clutch.
As shown in fig. 9, the second cooling flow rate determining unit 702 in the embodiment of the present invention is a schematic structural diagram, where the second cooling flow rate determining unit 702 includes:
a target gear determining unit 801, configured to obtain a target gear of the transmission according to the vehicle speed and the accelerator pedal opening;
a gear shift determination unit 802, configured to determine whether the gear of the transmission is equal to the target gear;
a first determination unit 803, configured to determine that the second cooling flow rate is 0 in a case where the transmission gear is not equal to the target gear;
a second determining unit 804, configured to perform a gear shift operation when the gearbox gear is equal to the target gear, and determine the second cooling flow according to all the second cooling flows determined in a time period set before the current sampling time and a set relationship curve of changes of the flows with time.
As shown in fig. 10, which is a schematic structural diagram of a second determining unit 804 in the embodiment of the present invention, where the second determining unit 804 includes:
a first time determining unit 901, configured to find, on the relationship curve, a first time of a second cooling flow determined at a previous sampling time corresponding to a current sampling time according to all second cooling flows in a time period set before the current sampling time;
a second time determining unit 902, configured to determine a second time, and make the second time equal to the first time plus the set sampling period;
a third determining unit 903, configured to determine that the second cooling flow rate is equal to a flow rate on the relationship curve corresponding to the second time.
Preferably, the relationship curve is a trapezoidal wave.
In another preferred embodiment of the present invention, the data acquisition unit 601 is further configured to: and acquiring the temperature of the cooling oil flowing through the double clutches and the temperature of the cooling oil flowing through the gears of the gearbox at intervals of the set sampling period.
The system further comprises a third cooling flow determining unit, and the third cooling flow determining unit is used for obtaining a third cooling flow of the cooling oil flowing through the double clutch according to the temperature of the cooling oil flowing through the double clutch and the temperature of the cooling oil flowing through the transmission gear.
The quasi-expected cooling flow determination unit 703 is specifically configured to: determining the quasi-desired cooling flow as a maximum of the first, second, and third cooling flows.
The specific processing procedures of the above units can refer to the description in the method of the embodiment of the present invention, and are not described herein again.
It should be noted that the above-described system embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (10)
1. A cooling flow control method of a double clutch automatic transmission is characterized by comprising the following steps:
acquiring the sliding grinding work of the first clutch, the sliding grinding work of the second clutch, the gear of a gearbox, the vehicle speed and the opening degree of an accelerator pedal at intervals of a set sampling period;
acquiring the expected cooling flow of the cooling oil flowing through the double clutches according to the sliding friction work of the first clutch, the sliding friction work of the second clutch, the gear position of the gearbox, the vehicle speed and the opening degree of an accelerator pedal;
adjusting a flow valve, and enabling the difference between the flow rate of the cooling oil of the double clutches and the expected cooling flow rate to be within a set error range; wherein,
the obtaining a desired cooling flow of cooling oil through the dual clutch includes:
acquiring a first cooling flow of cooling oil flowing through the double clutches according to the sliding friction work of the first clutch and the sliding friction work of the second clutch;
acquiring a second cooling flow of the cooling oil flowing through the double clutches according to the gear position of the gearbox, the vehicle speed and the opening degree of an accelerator pedal;
determining a quasi-desired cooling flow rate and making the quasi-desired cooling flow rate a maximum of the first cooling flow rate and the second cooling flow rate;
and performing limit processing on the quasi-expected cooling flow, and determining the quasi-expected cooling flow after limit processing as the expected cooling flow of the cooling oil flowing through the double clutches.
2. The cooling flow control method of claim 1, wherein said obtaining a second cooling flow of cooling oil through the dual clutch comprises:
acquiring a target gear of the gearbox according to the vehicle speed and the opening degree of an accelerator pedal;
judging whether the gear of the gearbox is equal to the target gear or not;
if not, performing gear shifting operation and determining that the second cooling flow is 0;
and if so, determining the second cooling flow according to all the second cooling flows determined in the set time period before the current sampling moment and the set relation curve of the flow changing along with the time.
3. The method of claim 2, wherein the determining the second cooling flow rate according to all the second cooling flow rates determined in a set time period before the current sampling time and a set time-dependent relationship curve of the flow rates comprises:
according to all second cooling flows in a set time period before the current sampling moment, finding a first moment of the second cooling flows determined at the previous sampling moment corresponding to the current sampling moment on the relation curve;
determining a second time and enabling the second time to be equal to the first time plus the set sampling period;
and determining that the second cooling flow rate is equal to the flow rate on the relation curve corresponding to the second moment.
4. The cooling flow control method according to claim 3, wherein the relationship curve is a trapezoidal wave.
5. The cooling flow control method according to any of claims 1 to 4, wherein the determining a quasi-desired cooling flow specifically comprises:
acquiring the temperature of the cooling oil flowing through the double clutches and the temperature of the cooling oil flowing through the gears of the gearbox at intervals of the set sampling period;
acquiring a third cooling flow of the cooling oil flowing through the double clutch according to the temperature of the cooling oil flowing through the double clutch and the temperature of the cooling oil flowing through the transmission gear;
determining the quasi-desired cooling flow as a maximum of the first cooling flow, the second cooling flow, and the third cooling flow.
6. A cooling flow control system for a twin clutch automatic transmission, comprising:
the data acquisition unit is used for acquiring the sliding friction work of the first clutch, the sliding friction work of the second clutch, the gear of the gearbox, the vehicle speed and the opening degree of an accelerator pedal at intervals of a set sampling period;
the expected cooling flow determining unit is used for acquiring the expected cooling flow of the cooling oil flowing through the double clutches according to the sliding friction work of the first clutch, the sliding friction work of the second clutch, the gear position of the gearbox, the vehicle speed and the opening degree of an accelerator pedal;
the adjusting unit is used for adjusting a flow valve and enabling the difference between the flow rate of the cooling oil of the double clutches and the expected cooling flow rate to be within a set error range; wherein,
the desired cooling flow rate determination unit includes:
the first cooling flow determining unit is used for acquiring a first cooling flow of the cooling oil flowing through the double clutches according to the sliding friction work of the first clutch and the sliding friction work of the second clutch;
the second cooling flow determining unit is used for acquiring a second cooling flow of the cooling oil flowing through the double clutches according to the gear position of the gearbox, the vehicle speed and the opening degree of an accelerator pedal;
a quasi-desired cooling flow rate determination unit configured to determine a quasi-desired cooling flow rate and make the quasi-desired cooling flow rate a maximum value of the first cooling flow rate and the second cooling flow rate;
and the limit value processing unit is used for carrying out limit value processing on the quasi-expected cooling flow and determining the quasi-expected cooling flow after the limit value processing as the expected cooling flow of the cooling oil flowing through the double clutches.
7. The cooling flow control system according to claim 6, characterized in that the second cooling flow determination unit includes:
the target gear determining unit is used for acquiring a target gear of the gearbox according to the vehicle speed and the opening degree of an accelerator pedal;
the gear shifting judging unit is used for judging whether the gear of the gearbox is equal to the target gear or not;
a first determination unit configured to determine that the second cooling flow rate is 0 when the transmission gear is not equal to the target gear;
and the second determining unit is used for determining the second cooling flow according to all the second cooling flows determined in a set time period before the current sampling moment and a set relation curve of the change of the flow along with time under the condition that the gear position of the gearbox is equal to the target gear position.
8. The cooling flow control system according to claim 7, characterized in that the second determination unit includes:
the first time determining unit is used for finding out a first time of a second cooling flow determined at a previous sampling time corresponding to the current sampling time on the relation curve according to all second cooling flows in a set time period before the current sampling time;
a second time determination unit, configured to determine a second time, and make the second time equal to the first time plus the set sampling period;
and a third determination unit configured to determine that the second cooling flow rate is equal to a flow rate on the relationship curve corresponding to the second time.
9. The cooling flow control system of claim 8, wherein the relationship curve is a trapezoidal wave.
10. The cooling flow control system according to any one of claims 6 to 9,
the data acquisition unit is further configured to: acquiring the temperature of the cooling oil flowing through the double clutches and the temperature of the cooling oil flowing through the gears of the gearbox at intervals of the set sampling period;
the system also comprises a third cooling flow determining unit, a second cooling flow determining unit and a control unit, wherein the third cooling flow determining unit is used for acquiring a third cooling flow of the cooling oil flowing through the double clutches according to the temperature of the cooling oil flowing through the double clutches and the temperature of the cooling oil flowing through the gears of the gearbox;
the quasi-desired cooling flow determination unit is specifically configured to: determining the quasi-desired cooling flow as a maximum of the first, second, and third cooling flows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410098269.8A CN103821919B (en) | 2014-03-17 | 2014-03-17 | The cooling flow controlling method of dual-clutch transmission and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410098269.8A CN103821919B (en) | 2014-03-17 | 2014-03-17 | The cooling flow controlling method of dual-clutch transmission and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103821919A CN103821919A (en) | 2014-05-28 |
| CN103821919B true CN103821919B (en) | 2016-04-27 |
Family
ID=50757133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410098269.8A Active CN103821919B (en) | 2014-03-17 | 2014-03-17 | The cooling flow controlling method of dual-clutch transmission and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103821919B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698864B (en) * | 2015-02-26 | 2017-03-01 | 安徽江淮汽车集团股份有限公司 | The clutch model control method of wet-type dual-clutch transmission and system |
| CN109084012B (en) * | 2018-09-27 | 2020-10-09 | 安徽江淮汽车集团股份有限公司 | Method and module for determining cooling flow of wet-type double-clutch transmission |
| CN110206828B (en) * | 2019-05-23 | 2021-01-15 | 中国第一汽车股份有限公司 | Hybrid power car clutch flow coordination control method and system |
| CN110131397A (en) * | 2019-06-21 | 2019-08-16 | 重庆青山工业有限责任公司 | Wet-type dual-clutch lubrication flow control system |
| CN110513407B (en) * | 2019-08-15 | 2021-11-19 | 安徽江淮汽车集团股份有限公司 | Clutch temperature control method and device, electronic equipment and storage medium |
| CN112664584B (en) * | 2019-10-16 | 2022-09-30 | 上海汽车集团股份有限公司 | Lubrication control method and device of wet clutch and vehicle |
| CN110985566B (en) * | 2019-12-28 | 2021-10-29 | 中国第一汽车股份有限公司 | Vehicle starting control method and device, vehicle and storage medium |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002098171A (en) * | 2000-09-21 | 2002-04-05 | Jatco Transtechnology Ltd | Lubrication control device of starting clutch for automatic transmission |
| JP2004324819A (en) * | 2003-04-25 | 2004-11-18 | Jatco Ltd | Hydraulic control device of automatic transmission |
| EP1589262B1 (en) * | 2004-04-22 | 2007-05-30 | Borg Warner Inc. | Hydraulic control unit for a dual clutch transmission and method of hydraulic control of such a transmission |
| DE102005013137A1 (en) * | 2005-03-22 | 2006-09-28 | Zf Friedrichshafen Ag | Method and device for controlling an oil supply for an automatic transmission and a starting element |
| JP4945139B2 (en) * | 2006-01-27 | 2012-06-06 | 日立オートモティブシステムズ株式会社 | Automotive control device |
| US8402993B2 (en) * | 2010-05-10 | 2013-03-26 | GM Global Technology Operations LLC | Hydraulic fluid cooling system for a dual clutch automatic transmission |
-
2014
- 2014-03-17 CN CN201410098269.8A patent/CN103821919B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103821919A (en) | 2014-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103821919B (en) | The cooling flow controlling method of dual-clutch transmission and system | |
| US9618112B2 (en) | Apparatus for detecting abnormal hydraulic pressure of automatic transmission | |
| CN104976243B (en) | The pre-oiling pressure adaptive method and system of wet dual-clutch automatic transmission | |
| US8406976B2 (en) | Clutch control device and clutch control correction amount calculating method | |
| CN101625023B (en) | Method and device for transmission noise suppression | |
| JP2009243630A (en) | Clutch control device and mu correction factor calculating method | |
| US20150120156A1 (en) | Method for controlling a dual clutch transmission | |
| RU2013133688A (en) | METHOD AND SYSTEM FOR CALIBRATING A DESIGN CHARACTERISTIC CURVE CLUTCH | |
| EP3227584B1 (en) | Lubrication system and a method for controlling the lubrication system | |
| CN105156645A (en) | Clutch temperature control method and system for automatic wet-type double-clutch gearbox | |
| CN111271443A (en) | Gear shifting controller and system of bulldozer | |
| CN104019221B (en) | Using the downshift control method of the output torque of detection | |
| CN105074288A (en) | Transmission control circuit | |
| CN103629344A (en) | Wet type double-clutch automatic gearbox transmission system and transmission control method thereof | |
| CN110131397A (en) | Wet-type dual-clutch lubrication flow control system | |
| US9810319B2 (en) | Control apparatus for automatic transmission | |
| CN103322163A (en) | Slipping control method for automatic transmission of wet double clutch | |
| US10174694B2 (en) | Method of optimizing vehicle performance based on countershaft acceleration | |
| CN103375585B (en) | Be equipped with the detection of the discharge clutch in neutral idling speed changer | |
| JP2006275227A (en) | Shift control device for automatic transmission | |
| US6199450B1 (en) | Method and apparatus | |
| US11993358B2 (en) | Multi-speed transmissions and methods for shifting multi-speed transmissions for marine vessels | |
| JP5043712B2 (en) | Automatic oil deterioration estimation device for automatic transmission | |
| CN110906000A (en) | Method for adjusting the fork synchronization position of a transmission and vehicle | |
| CN109578576B (en) | Automatic transmission starting gear shifting torque alternative control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Hefei City, Anhui Province, 230022 East Road No. 176 Patentee after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: Hefei City, Anhui Province, 230022 East Road No. 176 Patentee before: Anhui Jianghuai Automobile Co., Ltd. |
|
| CP02 | Change in the address of a patent holder |
Address after: 230601 No. 99 Ziyun Road, Hefei Economic and Technological Development Zone, Anhui Province Patentee after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: 230022 No. 176 Dongliu Road, Hefei City, Anhui Province Patentee before: Anhui Jianghuai Automobile Group Limited by Share Ltd |
|
| CP02 | Change in the address of a patent holder |