CN115451123A - DCT main oil pressure system based on double electronic oil pumps - Google Patents
DCT main oil pressure system based on double electronic oil pumps Download PDFInfo
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- 238000001816 cooling Methods 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 230000001050 lubricating effect Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims 4
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 213
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
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- 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
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/44—Control of exclusively fluid gearing hydrostatic with more than one pump or motor in operation
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- 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
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
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- 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
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0262—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being hydraulic
- F16H61/0276—Elements specially adapted for hydraulic control units, e.g. valves
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Abstract
The invention discloses a DCT (dual clutch transmission) main oil pressure system based on a double-electronic oil pump, which comprises two independent electronic oil pump modules, wherein the two electronic oil pump modules carry out real-time information interaction through a CAN (controller area network) bus, calculate the main oil pressure supply requirement in real time according to the operating condition of a transmission, and carry out oil supply distribution according to the application requirement of a hydraulic system to supply oil according to the requirement. The invention has the advantages of meeting the application requirements of the hydraulic system of the transmission, avoiding energy waste and improving the efficiency of the transmission and the fuel economy of the whole vehicle.
Description
Technical Field
The invention relates to the field of automobile double-clutch automatic transmissions, in particular to a DCT (dual clutch transmission) main oil pressure system.
Background
As an important automatic transmission type, a double-clutch automatic transmission (DCT) is widely applied to an automobile power assembly, and particularly has better performance in the aspects of uninterrupted power, transmission efficiency, driving experience and the like. For the double-clutch automatic transmission taking hydraulic pressure as a power source of an actuating mechanism, a main oil pressure system of the double-clutch automatic transmission provides a power source and system pressure for a clutch control hydraulic subsystem, a synchronizer control hydraulic subsystem and a cooling and lubricating hydraulic subsystem, so that the action requirements of the corresponding actuating mechanism are met, and clutch control, synchronizer control, cooling and lubricating and P-gear parking are realized.
The design and control of the DCT main oil pressure system directly affects the overall performance of the transmission, including the shift function, transmission efficiency, and system reliability. The common DCT main oil pressure system scheme has certain defects and shortcomings, real-time control can not be carried out according to actual needs in the running process of the transmission, and the working efficiency of the transmission is influenced. This is where the application needs to focus on improvement.
Disclosure of Invention
The invention aims to provide a DCT (dual-electronic transmission) main oil pressure system based on a dual-electronic oil pump, which meets the application requirement of a hydraulic system of a transmission, avoids energy waste and improves the efficiency of the transmission and the fuel economy of the whole vehicle.
In order to solve the technical problems, the invention provides a DCT (dual oil transfer controller) main oil pressure system based on a double-electronic oil pump, which comprises two independent electronic oil pump modules, wherein the two electronic oil pump modules perform real-time information interaction through a CAN (controller area network) bus, calculate the main oil pressure supply requirement in real time according to the operation working condition of a transmission, perform oil supply distribution according to the application requirement of a hydraulic system and supply according to the requirement.
The electronic oil pump module comprises an electronic oil pump, a motor and a motor controller, the motor controller outputs signals to control the motor, and the motor drives the oil pump; two independent motor controllers interact with a Transmission Control Unit (TCU) in real time through a Controller Area Network (CAN) bus to obtain a target pressure requirement and a target flow requirement of a main oil way, and the two electronic oil pump modules are subjected to oil supply distribution and supplied according to requirements; two independent electronic oil pump modules divide into main and auxiliary electronic oil pump module, specifically as follows:
1. when the pressure requirement or the flow requirement of the main oil path is smaller than the oil supply capacity of the main electronic oil pump module, the main electronic oil pump module supplies oil independently; the main motor controller calculates the rotating speed requirement of the main motor through the target pressure and the target flow of the main oil way, controls the main motor and drives the main oil pump to supply oil;
2. when the pressure requirement or the flow requirement of a main oil path is larger than the oil supply threshold value of the main electronic oil pump module, the main motor controller calculates the oil supply distribution of the two electronic oil pump modules to obtain the oil supply pressure and the flow requirement of the main electronic oil pump module and the auxiliary electronic oil pump module, calculates the rotating speed requirement of the main motor according to the target pressure requirement and the target flow requirement of the main electronic oil pump module, controls the main motor and drives the main oil pump to supply oil; the auxiliary motor controller acquires the target pressure requirement and the target flow requirement of the auxiliary electronic oil pump module through the CAN bus, calculates the rotating speed requirement of the auxiliary motor, controls the auxiliary motor and drives the auxiliary oil pump to supply oil.
When any one of the two independent electronic oil pump modules fails, the other electronic oil pump module supplies oil independently, and the gearbox controller acquires failure information and enters a failure mode; wherein:
when the main electronic oil pump module fails, the oil supply capacity is lost, and the auxiliary electronic oil pump module supplies oil independently; the auxiliary motor controller acquires a target pressure requirement and a target flow requirement of the main oil way through a CAN bus, calculates to obtain a rotating speed requirement of the auxiliary motor, controls the auxiliary motor and drives the auxiliary oil pump to supply oil;
when the auxiliary electronic oil pump module fails, the oil supply capacity is lost, and the main electronic oil pump module independently supplies oil at the moment;
the working conditions of high oil pressure requirement and high flow requirement can be limited in a fault mode, the pressure and flow requirements of most working conditions are met, and meanwhile, the working condition of large load and the working condition of large flow are avoided.
The control modes of the transmission include steady state control, upshift control, park control, and dynamic control modes. According to the control mode of the transmission, the oil supply pressure requirements of the main oil way under the corresponding control modes are respectively calculated:
1) When the transmission is in a steady-state control process, the pressure requirement of the main oil path mainly comes from a clutch hydraulic subsystem, net input torque of an engine is obtained through a CAN bus, friction loss of a clutch is considered, and therefore the actual input torque of the transmission is obtained through calculation, and the pressure requirement of the main oil path in the steady-state control process is obtained through the actual input torque of the transmission and the calculated torque change rate;
2) When the transmission is in a gear lifting control process, the pressure requirement of a main oil path mainly comes from a synchronizer control hydraulic subsystem, and the pressure requirement of a shifting fork of the synchronizer during gear shifting control is determined through tests under different working conditions;
3) When the transmission is in the parking control and dynamic control modes, the pressure requirement is obtained through testing and calibration of actual working conditions.
The target flow requirements of the transmission are derived primarily from clutch cooling requirements, synchronizer control flow requirements, and cooling and lubrication flow requirements of the shaft teeth, wherein:
1) The cooling demand of the clutch mainly comes from heat dissipation when the clutch rubs, and is obtained by calculating the friction work, the actual transmission torque of the clutch and the speed difference of the driving end and the driven end of the clutch are respectively calculated through an input and output torque signal and an input and output shaft rotating speed signal, the friction work is in direct proportion to the product of the friction speed difference of the clutch and the actual transmission torque, the relation MAP of the friction work demand cooling flow is obtained through testing and calibration, and the demand flow is finally calculated;
2) In the synchronizer control, the shifting speed is used as the demand input, the demand is provided for the flow of a main oil path, the position of the synchronizer is used as the signal input, whether the synchronizer is successfully combined or not is judged, and the partial flow demand is obtained through test calibration;
3) The lubricating flow of the shaft teeth is in direct proportion to the output torque of the transmission and the rotating speed of an output shaft, and is calculated by the output torque of the transmission and the rotating speed of the output shaft;
taking the maximum value as the target flow demand of the transmission according to the flow demands of the above parts.
Based on the target pressure and the target flow demand of the transmission, the main oil pressure of the DCT is supplied according to the demand through the cooperative control of the double electronic oil pump modules, the lowest overall power consumption of the double electronic oil pump modules is realized, and meanwhile, the reliability of the main oil pressure supply is enhanced, and the control method comprises the following steps:
s1: judging whether the main electronic oil pump module has faults or not;
if the main electronic oil pump module has faults, turning to S2;
if the main electronic oil pump module has no fault, turning to S3;
s2: judging whether the auxiliary electronic oil pump module has faults or not;
if the auxiliary electronic oil pump module has faults, the main motor controller and the auxiliary motor controller respectively send fault information to the transmission controller TCU, and the TCU controls the transmission to enter a limp mode;
if the auxiliary electronic oil pump module has no fault, judging whether the auxiliary electronic oil pump meets the main oil pressure requirement or not;
if the auxiliary oil pump meets the main oil pressure requirement, the auxiliary motor controller controls the auxiliary motor to reach the target rotating speed, and the main motor does not work;
if the auxiliary oil pump does not meet the main oil pressure requirement, the auxiliary motor calculates the thermal protection current limit value based on the thermal model and takes the thermal protection current limit value as the limit value, and the auxiliary motor controller controls the duty ratio of the auxiliary motor;
s3: judging whether the main electronic oil pump meets the main oil pressure requirement or not;
if the main electronic oil pump meets the main oil pressure requirement, the main motor controller controls the main motor to reach the target rotating speed, and the auxiliary motor does not work;
if the main electronic oil pump does not meet the main oil pressure requirement, judging whether the auxiliary electronic oil pump module has a fault;
if the auxiliary electronic oil pump module has a fault, the main motor controller calculates a thermal protection current limit value based on the thermal model and controls the duty ratio of the main motor by taking the thermal protection current limit value as the limit value;
if the auxiliary electronic oil pump module has no fault, the following steps are carried out:
1) Respectively calculating target rotating speeds n1 and n2 of a main motor and an auxiliary motor by taking the minimum integral power consumption of a main oil pressure system as a target;
2) The main motor controller and the auxiliary motor controller respectively collect actual currents I of the main motor and the auxiliary motor 1 ，I 2 ；
3) The main motor controller and the auxiliary motor controller respectively calculate a thermal protection current limit value I based on the thermal model LT1 ，I LT2 ；
4) Determining the actual current I of the main motor 1 Whether or not it is less than thermal protection current limit value I LT1 ；
If I 1 ＜ I LT1 If not, the main motor is driven by I LT1 Setting a target rotating speed for a limit value, updating and calculating the target rotating speed n2x of the auxiliary motor according to the main oil pressure requirement, and acquiring the actual current of the auxiliary motor with the target rotating speed n2x by the auxiliary motor controllerI 2x ；
And then judgment of I 2x Whether or not less than I LT2 ；
If I 2x ＜ I LT2 If true, then with I LT1 The main motor controller controls the duty ratio of the main motor as a limit value; with n2x as a target rotating speed, the auxiliary motor controller controls the duty ratio of the auxiliary motor;
if I 2x ＜ I LT2 If not, use I LT1 The main motor controller controls the duty ratio of the main motor as a limit value; with I LT2 The auxiliary motor controller controls the duty ratio of the auxiliary motor as a limit value;
if I 1 ＜ I LT1 If true, the actual current I of the auxiliary motor is judged 2 Whether or not less than I LT2 ；
If I 2 ＜ I LT2 If yes, taking n1 as a target rotating speed, and controlling the duty ratio of the main motor by the main motor controller; with n2 as a target rotating speed, the auxiliary motor controller controls the duty ratio of the auxiliary motor;
if I 2 ＜ I LT2 If not, the auxiliary motor is provided with I LT2 Setting a target rotating speed for a limit value, updating and calculating the target rotating speed n1x of the main motor according to the main oil pressure requirement, and collecting the actual current I of the main motor with the n1x as the target rotating speed by a main motor controller 1x Judgment of I 1x Whether or not less than I LT1 ；
If I 1x ＜ I LT1 If yes, the main motor controller controls the duty ratio of the main motor by taking n1x as a target rotating speed; with I LT2 The auxiliary motor controller controls the duty ratio of the auxiliary motor as a limit value;
if I 1x ＜ I LT1 If not, use I LT1 The main motor controller controls the duty ratio of the main motor as a limit value; with I LT2 And the auxiliary motor controller controls the duty ratio of the auxiliary motor as a limit value.
The invention has the following advantages:
1) Power loss is reduced, and transmission efficiency is improved: the application of a mechanical oil pump is cancelled, unnecessary power loss of a high-flow pump under the working condition of a small load requirement is avoided, the two electronic oil pumps calculate the pressure and flow supply requirement in real time according to the actual operating condition of the transmission, carry out real-time information interaction and coordination through CAN communication, and accurately control the pressure and flow supply of the electronic oil pumps according to the application requirement of a hydraulic system, so that the supply as required is realized, the application requirement of the hydraulic system of the transmission is met, the energy waste is avoided, and the efficiency of the transmission and the fuel economy of the whole vehicle are improved;
2) Reliability and safety are enhanced: two electronic oil pump modules in the main oil pressure system can supply oil pressure, so that the problem that a transmission cannot transmit power due to the fact that a certain branch fails is avoided;
3) Compared with a single electronic oil pump which provides main oil pressure for the whole transmission hydraulic system, the driving power and the motor driving current of the single electronic oil pump are relatively large, the two electronic oil pump modules are sampled, the power driving requirement originally concentrated on the single module is decomposed into two independent modules, the maximum current of a power device is reduced, the design difficulty is reduced, and the development cost is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic block diagram of a DCT main oil pressure system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the calculation of the pressure requirement of the main oil path of the DCT according to the embodiment of the invention;
FIG. 3 is a schematic diagram illustrating calculation of a flow demand of a DCT main oil path according to an embodiment of the present invention;
FIG. 4 is a flowchart of a DCT main oil pressure control system according to an embodiment of the present invention;
FIG. 5 is a flow chart of the primary oil control system in the event of a failure of the first oil pump set in accordance with an embodiment of the present invention;
FIG. 6 is a flow chart of the primary oil control system in the event of a failure of the second oil pump set in accordance with an embodiment of the present invention;
FIG. 7 is a flow chart illustrating the overall power consumption of the main hydraulic system according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 illustrates a schematic block diagram of a DCT main oil pressure system in accordance with an embodiment of the present invention. As shown in FIG. 1, the invention provides a DCT (dual oil control unit) main oil pressure system based on a dual-electronic oil pump, which comprises two independent electronic oil pump sets, wherein the first electronic oil pump set comprises an electronic oil pump P1, a motor M1 and a motor controller E1, and the second electronic oil pump set comprises an electronic oil pump P2, a motor M2 and a motor controller E2. The motor controller E1 and the motor controller E2 are mutually independent and carry out real-time information interaction through a CAN bus. The electronic oil pump P1 works as a main oil pump, the electronic oil pump P2 works as an auxiliary oil pump, the main oil pressure supply requirement is calculated in real time according to the operation working condition of the transmission, oil supply distribution is reasonably carried out according to the application requirement of a hydraulic system, and supply according to requirements is achieved. Wherein: the first oil pump set meets the pressure requirement and the flow requirement of a main oil way under most working conditions, and the second oil pump set performs auxiliary oil supply under the working condition that the pressure requirement of the main oil way of the system is large or the flow requirement is large, so that two oil pump sets with relatively small oil supply capacity are selected, the high technical requirement of supplying oil by a single electronic pump is avoided, and the technical implementation difficulty is reduced.
And the motor controller E1 and the motor controller E2 interact with a Transmission Control Unit (TCU) through a Controller Area Network (CAN) bus to obtain a target pressure requirement and a target flow requirement of a main oil way. And the motor controller E1 performs oil supply distribution on the first oil pump group and the second oil pump group according to the target pressure requirement and the target flow requirement of the main oil way. When the requirement of the main oil path is smaller than the oil supply capacity of the first oil pump group, the first oil pump group supplies oil independently, the motor controller E1 calculates the rotating speed requirement of the motor M1 through the target pressure and the target flow, controls the motor M1 and drives the oil pump P1 to supply oil. When the pressure requirement or the flow requirement of a main oil path is larger than the oil supply threshold value of the first oil pump group, the motor controller E1 calculates the oil supply distribution of the two oil pump groups to obtain the oil supply pressure and the flow requirement of the first oil pump group and the second oil pump group, calculates the rotating speed requirement of the motor M1 according to the target pressure requirement and the target flow requirement of the first oil pump group, controls the motor M1 and drives the oil pump P1 to supply oil. And the motor controller E2 acquires the target pressure requirement and the target flow requirement of the second oil pump group through the CAN bus, calculates the rotating speed requirement of the motor M2, controls the motor M2 and drives the oil pump P2 to supply oil. The two electronic oil pump sets calculate the main oil pressure supply requirement in real time according to the operation working condition of the transmission, and supply oil distribution is carried out according to the application requirement of the system, so that supply is realized according to the requirement.
When the first oil pump set assembly breaks down, the oil supply capacity is lost, and at the moment, the second oil pump set independently supplies oil. And the motor controller E2 acquires the target pressure requirement and the target flow requirement of the main oil way through the CAN bus, calculates the rotating speed requirement of the motor M2, controls the motor M2 and drives the oil pump P2 to supply oil.
When the second oil pump group assembly breaks down, the oil supply capacity is lost, and the first oil pump group alone supplies oil at the moment. And when any oil pump set fails, the gearbox controller acquires failure information and enters a failure mode. The working conditions of high oil pressure requirement and high flow requirement are limited under the fault mode, the pressure and flow requirements of most working conditions are met, and meanwhile, the large-load working condition and the large-flow working condition are avoided.
As shown in fig. 2, the control modes of the transmission include a steady state control mode, a shift control mode, a parking control mode, a dynamic control mode, and the like, and the corresponding oil supply pressure requirements are respectively calculated according to the control modes of the transmission. When the transmission is in a steady-state control process, the main oil path pressure requirement mainly comes from a clutch hydraulic subsystem, net input torque of an engine is obtained through a CAN bus, friction loss of the clutch is considered, and therefore the actual input torque of the transmission is obtained through calculation, and the main oil path pressure requirement in the steady-state control process is obtained through the actual input torque of the transmission and the calculated torque change rate. When the transmission is in the lifting gear control process, the pressure requirement of a main oil circuit mainly comes from a synchronizer control hydraulic subsystem, and the pressure requirement of a shifting fork of the synchronizer in gear shifting control is determined through tests under different working conditions. When the transmission is in the parking control mode and the dynamic control mode, the pressure requirement of the system is obtained through testing and calibration of actual working conditions.
As shown in FIG. 3, the target flow requirements for the transmission are primarily derived from the clutch cooling requirements, synchronizer control flow requirements, and cooling and lubrication flow requirements for the shaft teeth. The cooling requirement of the clutch mainly comes from heat dissipation when the clutch slides, the cooling requirement is obtained by sliding friction work calculation, and the actual transmission torque of the clutch and the speed difference of the driving end and the driven end of the clutch are respectively calculated through input and output torque signals and input and output shaft rotating speed signals. The sliding friction work is in direct proportion to the product of the sliding friction speed difference of the clutch and the actual transmission torque, the relation MAP of the sliding friction work required cooling flow is obtained through test calibration, and the required flow is finally obtained through calculation. In the control of the synchronizer, the gear shifting speed is used as the demand input, the demand is provided for the flow of the main oil way, the position of the synchronizer is used as the signal input, whether the synchronizer is successfully combined or not is judged, and the flow demand of the part is obtained through test calibration. The cooling and lubricating flow of the shaft teeth is in direct proportion to the output torque of the transmission and the rotating speed of the output shaft, and is calculated by the output torque of the transmission and the rotating speed of the output shaft. And taking the maximum value as the flow demand of the system according to the flow demand of each part.
Based on the target pressure and the target flow demand of the transmission, the main oil pressure of the DCT is supplied according to the demand through the cooperative control of the dual-electronic oil pump module, so that the lowest overall power consumption of the dual-electronic oil pump module is realized, and the reliability of the main oil pressure supply is enhanced, as shown in fig. 4-7, the control method comprises the following steps:
1) Judging whether the first oil pump group has faults or not, wherein the faults include whether the electronic oil pump P1, the motor M1 and the motor controller E1 have faults or not;
2) If the first oil pump group has faults, judging whether the second oil pump group has faults or not, including whether the electronic oil pump P2, the motor M2 and the motor controller E2 have faults or not; if the second oil pump group also has faults, E1 and E2 respectively send fault information to a Transmission Controller (TCU), and the TCU controls the transmission to enter a limp-home mode; if the second oil pump set has no fault, judging whether P2 meets the main oil pressure requirement, if P2 meets the main oil pressure requirement, controlling M2 to the target rotating speed by E2, and enabling M1 not to work; if P2 does not meet the main oil pressure requirement, E2 calculates a thermal protection current limit I based on the thermal model LT2 And with I LT2 To limit, E2 controls M2 to account forSpace ratio;
3) If the first oil pump set has no fault, judging whether P1 meets the main oil pressure requirement, if P1 meets the main oil pressure requirement, E1 controls M1 to the target rotating speed, and M2 does not work;
4) If P1 does not meet the main oil pressure requirement, judging whether the second oil pump set has a fault, and if the second oil pump set has the fault, E1 calculating a thermal protection current limit value I based on the thermal model LT1 And with I LT1 For limiting value, E1 controls the duty ratio of M1;
5) If the second oil pump group has no fault, respectively calculating target rotating speeds n1 and n2 of the M1 and the M2 by taking the whole main oil pressure system, namely the minimum power consumption of the first oil pump group and the second oil pump group as a target;
6) E1 and E2 respectively collect actual currents I of M1 and M2 1 ，I 2 ；
7) E1 and E2 respectively calculate the thermal protection current limit value I based on the thermal model LT1 ，I LT2 ；
8) Determining the actual current I of M1 1 Whether or not less than I LT1 If not, according to M1, I LT1 Setting a target rotating speed for a limit value, updating and calculating a target rotating speed n2x of the M2 according to a main oil pressure requirement, namely transferring an oil supply requirement which cannot be realized by the M1 to the M2, and collecting an actual current I of the M2 with the n2x as the target rotating speed by the E2 2x Judgment of I 2x Whether or not less than I LT2 If true, use I LT1 For limiting value, E1 controls the duty ratio of M1; controlling the duty ratio of M2 by E2 with n2x as a target rotating speed; if I 2x Is less than I LT2 If not, use I LT1 To limit, E1 controls the duty cycle of M1 to I LT2 For limiting value, E2 controls the duty ratio of M2;
9) If the actual current I of M1 1 Is less than I LT1 If true, the actual current I of M2 is determined 2 Whether or not less than I LT2 If yes, controlling the duty ratio of M1 by using n1 as a target rotating speed and controlling the duty ratio of M2 by using E1 as a target rotating speed, and controlling the duty ratio of M2 by using n2 as a target rotating speed; if the actual current I of M2 2 Is less than I LT2 If not, the signal is converted into I according to M2 LT2 The target rotation speed is set for the limit value, and the target rotation speed n1x of M1 is updated and calculated according to the main oil pressure requirement, namely the supply which can not be realized by M2 is neededThe oil demand is transferred to M1, and E1 acquires the actual current I of M1 with n1x as the target rotating speed 1x Judgment of I 1x Whether or not less than I LT1 If yes, using n1x as target rotation speed, E1 controls duty ratio of M1 to I LT2 For limiting value, E2 controls the duty ratio of M2; if I 1x Is less than I LT1 If not, use I LT1 To limit, E1 controls the duty cycle of M1 to I LT2 To limit, E2 controls the M2 duty cycle.
According to the invention, the main oil pressure of the system is supplied as required according to the real-time application requirement of the transmission, the gear shifting requirement of the transmission is met, meanwhile, unnecessary system oil pressure supply is reduced, the efficiency of the transmission is improved, the reliability is improved through the cooperative work of the double electronic oil pumps, and the limp mode of the transmission triggered by the failure of the main oil pressure supply is avoided.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a DCT owner oil pressure system based on two electronic oil pumps which characterized in that: the system comprises two independent electronic oil pump modules, wherein the two electronic oil pump modules perform real-time information interaction through a CAN bus, calculate the main oil pressure supply requirement in real time according to the operation condition of a transmission, perform oil supply distribution according to the application requirement of a hydraulic system and supply the oil according to the requirement.
2. The dual electronic oil pump based DCT primary oil pressure system according to claim 1, wherein: the electronic oil pump module comprises an electronic oil pump, a motor and a motor controller, the motor controller outputs a signal to control the motor, and the motor drives the oil pump; two independent motor controllers interact with a transmission controller TCU in real time through a CAN bus to obtain the target pressure requirement and the target flow requirement of a main oil way, and the two electronic oil pump modules are subjected to oil supply distribution and supplied according to requirements.
3. The dual-electronic-oil-pump-based DCT main oil pressure system according to claim 1 or 2, characterized in that: the two independent electronic oil pump modules are divided into a main electronic oil pump module and an auxiliary electronic oil pump module, when the pressure requirement or the flow requirement of a main oil path is smaller than the oil supply capacity of the main electronic oil pump module, the main electronic oil pump module supplies oil independently, the main motor controller calculates the rotating speed requirement of the main motor through the target pressure and the target flow of the main oil path, controls the main motor and drives the main oil pump to supply oil; when the pressure requirement or the flow requirement of a main oil path is larger than the oil supply threshold value of the main electronic oil pump module, the main motor controller calculates the oil supply distribution of the main electronic oil pump module and the auxiliary electronic oil pump module to obtain the oil supply pressure and the flow requirement of the main electronic oil pump module, calculates the rotating speed requirement of the main motor according to the target pressure requirement and the target flow requirement of the main electronic oil pump module, controls the main motor and drives the main oil pump to supply oil; the auxiliary motor controller acquires the target pressure requirement and the target flow requirement of the auxiliary electronic oil pump module through the CAN bus, calculates the rotating speed requirement of the auxiliary motor, controls the auxiliary motor and drives the auxiliary oil pump to supply oil.
4. The dual electronic oil pump based DCT main oil pressure system according to claim 1 or 2, characterized in that: and when any one of the two independent electronic oil pump modules fails, the other electronic oil pump module independently supplies oil, and the gearbox controller acquires failure information.
5. The dual-electronic-oil-pump-based DCT main oil pressure system according to claim 2, characterized in that: the obtaining of the target pressure requirement of the main oil path is to respectively calculate the oil supply pressure requirements of the main oil path in the corresponding control modes according to the steady-state control mode, the gear-up-down control mode, the parking control mode and the dynamic control mode of the transmission, and specifically includes the following steps:
1) The transmission is in a steady-state control mode, the pressure requirement of the main oil path is from a clutch hydraulic subsystem, net input torque of an engine is obtained through a CAN bus, actual input torque of the transmission is obtained through calculation, and the pressure requirement of the main oil path is obtained through the actual input torque of the transmission and the calculated torque change rate;
2) The transmission is in a lifting gear control mode, pressure requirements of a main oil circuit come from a synchronizer control hydraulic subsystem, and pressure requirements of a shifting fork of the synchronizer during gear shifting control are determined through tests under different working conditions;
3) The transmission is in a parking control mode and a dynamic control mode, and the pressure requirement is obtained through testing and calibration of actual working conditions.
6. The dual electronic oil pump based DCT primary oil pressure system according to claim 2, wherein: the target flow demand of the main oil way is obtained from the clutch cooling demand, the synchronizer control flow demand and the shaft tooth cooling and lubricating flow demand, and the method specifically comprises the following steps:
1) The cooling demand of the clutch comes from heat dissipation when the clutch rubs, and is obtained by calculating the friction work, the actual transmission torque of the clutch and the speed difference of the driving end and the driven end of the clutch are respectively calculated through an input and output torque signal and an input and output shaft rotating speed signal, the friction work is in direct proportion to the product of the friction speed difference of the clutch and the actual transmission torque, the relation MAP of the friction work demand cooling flow is obtained through test calibration, and the demand flow is finally calculated;
2) In the synchronizer control, the shifting speed is used as the demand input, the demand is provided for the flow of a main oil path, the position of the synchronizer is used as the signal input, whether the synchronizer is successfully combined or not is judged, and the flow demand controlled by the synchronizer is obtained through test calibration;
3) The lubricating flow of the shaft teeth is in direct proportion to the output torque of the transmission and the rotating speed of an output shaft, and is calculated by the output torque of the transmission and the rotating speed of the output shaft;
the flow demand of each part above is taken as the target flow demand of the transmission.
7. The dual-electronic-oil-pump-based DCT main oil pressure system according to claim 2, characterized in that: the coordinated main oil pressure regulating valve is used for performing oil supply distribution on the two electronic oil pump modules and supplying oil according to needs, and the control method comprises the following steps:
s1: judging whether the main electronic oil pump module has faults or not;
if the main electronic oil pump module has faults, turning to S2;
if the main electronic oil pump module has no fault, turning to S3;
s2: judging whether the auxiliary electronic oil pump module has a fault or not;
if the auxiliary electronic oil pump module has a fault, the main motor controller and the auxiliary motor controller respectively send fault information to the transmission controller TCU, and the TCU controls the transmission to enter a limp mode;
if the auxiliary electronic oil pump module has no fault, judging whether the auxiliary electronic oil pump meets the main oil pressure requirement or not;
if the auxiliary oil pump meets the main oil pressure requirement, the auxiliary motor controller controls the auxiliary motor to reach the target rotating speed, and the main motor does not work;
if the auxiliary oil pump does not meet the main oil pressure requirement, the auxiliary motor calculates the thermal protection current limit value based on the thermal model and takes the thermal protection current limit value as the limit value, and the auxiliary motor controller controls the duty ratio of the auxiliary motor;
s3: judging whether the main electronic oil pump meets the main oil pressure requirement or not;
if the main electronic oil pump meets the main oil pressure requirement, the main motor controller controls the main motor to reach the target rotating speed, and the auxiliary motor does not work;
if the main electronic oil pump does not meet the main oil pressure requirement, judging whether the auxiliary electronic oil pump module has a fault;
if the auxiliary electronic oil pump module has faults, the main motor controller calculates a thermal protection current limit value based on the thermal model and controls the duty ratio of the main motor by taking the thermal protection current limit value as the limit value;
if the auxiliary electronic oil pump module has no fault, the following steps are carried out:
1) Respectively calculating target rotating speeds n1 and n2 of a main motor and an auxiliary motor by taking the minimum integral power consumption of a main oil pressure system as a target;
2) The main motor controller and the auxiliary motor controller respectively collect actual currents I of the main motor and the auxiliary motor 1 ，I 2 ；
3) The main motor controller and the auxiliary motor controller respectively calculate a thermal protection current limit value I based on a thermal model LT1 ，I LT2 ；
4) Determining the actual current I of the main motor 1 Whether or not it is less than thermal protection current limit value I LT1 ；
If I 1 ＜ I LT1 If not, the main motor is driven by I LT1 Setting a target rotating speed for a limit value, updating and calculating the target rotating speed n2x of the auxiliary motor according to the main oil pressure requirement, and acquiring the actual current I of the auxiliary motor with the n2x as the target rotating speed by the auxiliary motor controller 2x ；
Then judging I 2x Whether or not less than I LT2 ；
If I 2x ＜ I LT2 If true, then with I LT1 The main motor controller controls the duty ratio of the main motor as a limit value; controlling the duty ratio of an auxiliary motor by an auxiliary motor controller by taking n2x as a target rotating speed;
if I 2x ＜ I LT2 If not, use I LT1 The main motor controller controls the duty ratio of the main motor as a limit value; with I LT2 Controlling the duty ratio of the auxiliary motor by the auxiliary motor controller as a limit value;
if I 1 ＜ I LT1 If true, the actual current I of the auxiliary motor is judged 2 Whether or not less than I LT2 ；
If I 2 ＜ I LT2 If yes, taking n1 as a target rotating speed, and controlling the duty ratio of the main motor by the main motor controller; with n2 as a target rotating speed, the auxiliary motor controller controls the duty ratio of the auxiliary motor;
if I 2 ＜ I LT2 If not, the auxiliary motor is provided with I LT2 Setting a target rotating speed for a limit value, updating and calculating the target rotating speed n1x of the main motor according to the main oil pressure requirement, and acquiring the actual current I of the main motor by a main motor controller 1x Judgment of I 1x Whether or not less than I LT1 ；
If I 1x ＜ I LT1 If yes, taking n1x as a target rotating speed, and controlling the duty ratio of the main motor by the main motor controller; with I LT2 For limit value, the auxiliary motor controller controlsDuty cycle of the auxiliary motor;
if I 1x ＜ I LT1 If not, use I LT1 The main motor controller controls the duty ratio of the main motor as a limit value; with I LT2 And the auxiliary motor controller controls the duty ratio of the auxiliary motor as a limit value.
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| CN202211106285.8A CN115451123A (en) | 2022-09-11 | 2022-09-11 | DCT main oil pressure system based on double electronic oil pumps |
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Application publication date: 20221209 |