CN113074103B - Electronic oil pump control method and system with communication fault self-adaptive operation function - Google Patents

Electronic oil pump control method and system with communication fault self-adaptive operation function Download PDF

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Publication number
CN113074103B
CN113074103B CN202110445533.0A CN202110445533A CN113074103B CN 113074103 B CN113074103 B CN 113074103B CN 202110445533 A CN202110445533 A CN 202110445533A CN 113074103 B CN113074103 B CN 113074103B
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oil pump
rotating speed
electronic oil
vehicle
electric automobile
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CN113074103A (en
Inventor
郭伟
袁宇翔
罗力成
徐向阳
董鹏
王书翰
刘艳芳
陈永龙
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Ningbo Shenglong Automotive Powertrain System Co Ltd
Ningbo Institute of Innovation of Beihang University
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Ningbo Shenglong Automotive Powertrain System Co Ltd
Ningbo Institute of Innovation of Beihang University
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Publication of CN113074103A publication Critical patent/CN113074103A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/20—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors for controlling one motor used for different sequential operations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The invention provides an electronic oil pump control method and system with communication fault self-adaptive operation, which are applied to an electronic oil pump controller of an electric automobile; the method comprises the following steps: acquiring the state quantity of the electric automobile; judging whether a required rotating speed signal of the electronic oil pump is received or not; the required rotating speed signal is a control signal sent to an electronic oil pump controller by an automatic transmission control unit of the electric automobile through a CAN bus; if not, calculating the target rotating speed of the electronic oil pump by using a preset expert table based on the state quantity of the electric automobile; the preset expert table is a relation table between the required rotating speed of the electronic oil pump and the state quantity of the electric automobile; and adjusting the rotating speed of the electronic oil pump of the electric automobile based on the target rotating speed. The invention solves the technical problems of vehicle anchorage and safety reduction caused by communication failure between the electronic oil pump and the transmission control unit in the prior art.

Description

Electronic oil pump control method and system with communication fault self-adaptive operation function
Technical Field
The invention relates to the technical field of control of electronic oil pumps for automobiles, in particular to a control method and a control system of an electronic oil pump with communication fault self-adaptive operation.
Background
The control of the vehicle electronic oil pump mainly depends on a built-in controller to control the motor of the electronic oil pump. The controller receives a rotating speed demand signal from an automobile CAN bus to control the driving motor of the electronic oil pump, so that the working state of the electronic oil pump is controlled. Based on the current working state and the target working state, the rotating speed of the driving motor of the electronic oil pump is adjusted according to a control algorithm to control the working state of the electronic oil pump to reach an expected level, and the control is speed closed-loop control. The electronic oil pump motor Control algorithm is FOC (Field-Oriented Control), namely Field Oriented Control, also called vector frequency conversion, and is the best choice for the high-efficiency Control of the brushless direct current motor (BLDC) and the Permanent Magnet Synchronous Motor (PMSM) at present. In practical application, in the face of a fault of the electronic oil pump, different control systems are provided with fault diagnosis and fault processing modules for ensuring that the electronic oil pump can prompt fault information under the fault condition and realize operation under the fault condition. The major institutes of business put more emphasis on the field of fault detection, and there are fewer patents on the aspect of operating under fault conditions, and especially there are fewer concerns about communication faults.
The current electronic oil pump control algorithms with fault diagnosis strategies are numerous, Hitachi controls the starting of the oil pump based on the temperature of the electronic oil pump, and when the measured oil temperature is in a temperature range where whether the electric oil pump works normally or not is unclear, a fault undetermined state is set, so that the limited driving current and the target rotating speed are realized during normal operation. The electric oil pump is subjected to test operation, when the rotation speed cannot reach a specified rotation speed or more, the pump driving is stopped, and when the rotation speed reaches the specified rotation speed, the fault judgment is allowed, and the pump driving is performed according to the instruction. The electronic oil pump control strategy of korean modern corporation is also controlled based on temperature, and is judged by determining whether the temperature of the clutch is equal to or greater than a predetermined reference value previously input to the control unit; performing a vehicle speed check by checking whether the vehicle speed is equal to or greater than a predetermined reference value previously input to the control unit if it is determined that the clutch temperature is less than the predetermined reference value previously input to the control unit; and performing oil supply by the control unit operating the EOP to supply oil to the transmission. The green-transmission technology company Limited comprehensively judges the actual rotating speed, voltage and current of the electronic oil pump, determines the fault type of the electronic oil pump, and correspondingly controls the electronic oil pump according to the fault to enable the electronic oil pump to recover to be normal. At present, the control strategy patents of the electronic oil pump do not relate to the problem of communication faults, when the electronic oil pump has communication faults, most of algorithms select to disable the electronic oil pump and enable a traditional mechanical oil pump to supply oil to a lubricating component, such as CN111231985A of a Bao automobile, the method is effective for a traditional fuel oil automobile, but for a pure electric automobile, the method can only be driven by the electronic oil pump alone because the pure electric automobile does not have an engine and cannot use the traditional mechanical oil pump. And the oil pump when communication trouble takes place between electronic oil pump and the derailleur the control unit stops, can lead to the car to break down, can bring very big trouble for the user for the security and the reliability of vehicle are in a lower level.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for controlling an electronic oil pump with communication failure adaptive operation, so as to alleviate the technical problems of vehicle breakdown and safety reduction caused by communication failure between the electronic oil pump and a transmission control unit in the prior art.
In a first aspect, an embodiment of the present invention provides an electronic oil pump control method, which is applied to an electronic oil pump controller of an electric vehicle; the method comprises the following steps: acquiring the state quantity of the electric automobile; the state quantities include: the rotation speed of a vehicle driving motor, the torque of the vehicle driving motor, the water temperature of the vehicle and the vehicle speed; judging whether a required rotating speed signal of the electronic oil pump is received or not; the required rotating speed signal is a control signal sent to the electronic oil pump controller by an automatic gearbox control unit of the electric automobile through a CAN bus; if not, calculating the target rotating speed of the electronic oil pump by using a preset expert table based on the state quantity of the electric automobile; the preset expert table is a relation table between the required rotating speed of the electronic oil pump and the state quantity of the electric automobile; and adjusting the rotating speed of the electronic oil pump of the electric automobile based on the target rotating speed.
Further, the preset expert table comprises a first preset expert table and a second preset expert table; the first preset expert table is a relation table between the rotating speed of the vehicle driving motor and the torque of the vehicle driving motor and the rotating speed of the electronic oil pump; the second preset expert table is a relation table between the water temperature of the vehicle, the vehicle speed and the corrected value of the rotating speed of the electronic oil pump.
Further, calculating a target rotation speed of the electronic oil pump by using a preset expert table based on the state quantity of the electric vehicle, including: obtaining the initial rotating speed of the electronic oil pump based on the torque of the vehicle driving motor, the rotating speed of the vehicle driving motor and the first preset expert table; obtaining a rotating speed correction value of the electronic oil pump based on the vehicle water temperature, the vehicle speed and the second preset expert table; and obtaining the target rotating speed based on the initial rotating speed and the rotating speed correction value.
Further, after the electronic oil pump of the electric vehicle is subjected to speed adjustment based on the target speed, the method further comprises the following steps: measuring the bus current value of the electronic oil pump in real time; judging whether the bus current value is larger than a preset current value or not; and if so, adjusting the rotating speed of the electronic oil pump so as to reduce the bus current value to be below the preset current value.
Further, the method further comprises: and if the required rotating speed signal of the electronic oil pump is judged not to be received, sending a fault signal to an instrument panel of the electric automobile so as to enable the instrument panel to display the fault signal.
Further, the method further comprises: and if the electronic oil pump is judged to receive the required rotating speed signal, controlling the electronic oil pump to adjust the rotating speed based on the required rotating speed signal.
Further, the method further comprises: and carrying out self-adaptive learning updating on the preset expert table, wherein the self-adaptive learning updating comprises the following steps: acquiring real-time state quantity of the electric automobile during operation and real-time rotating speed of the electronic oil pump; and updating the preset expert table based on the relation between the real-time state quantity and the real-time rotating speed.
In a second aspect, an embodiment of the present invention further provides an electronic oil pump control system, which is applied to an electronic oil pump controller of an electric vehicle; the method comprises the following steps: the device comprises an acquisition module, a judgment module, a calculation module and a control module; the acquisition module is used for acquiring the state quantity of the electric automobile; the state quantities include: the rotation speed of a vehicle driving motor, the torque of the vehicle driving motor, the water temperature of the vehicle and the vehicle speed; the judging module is used for judging whether a required rotating speed signal of the electronic oil pump is received or not; the required rotating speed signal is a control signal sent to the electronic oil pump controller by an automatic gearbox control unit of the electric automobile through a CAN bus; the calculation module is used for calculating the target rotating speed of the electronic oil pump by using a preset expert table based on the state quantity of the electric automobile if the required rotating speed signal of the electronic oil pump is judged not to be received; the preset expert table is a relation table between the required rotating speed of the electronic oil pump and the state quantity of the electric automobile; and the control module is used for adjusting the rotating speed of the electronic oil pump of the electric automobile based on the target rotating speed.
In a third aspect, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to the first aspect when executing the computer program.
In a fourth aspect, the present invention also provides a computer-readable medium having non-volatile program code executable by a processor, where the program code causes the processor to execute the method of the first aspect.
The invention provides an electronic oil pump control method and system with communication fault self-adaptive operation, which are characterized in that an electronic oil pump controller is internally provided with a preset expert table, so that the electronic oil pump controller calculates the target rotating speed of an electronic oil pump by using the preset expert table on the basis of the state quantity of an electric automobile under the condition that a required rotating speed signal of the electronic oil pump is not received, and finally, the electronic oil pump of the electric automobile is subjected to rotating speed adjustment on the basis of the target rotating speed, so that the self-adaptive control under the condition of communication fault is realized, and the technical problems of vehicle anchorage and safety reduction caused when the communication fault occurs between the electronic oil pump and a transmission control unit in the prior art are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of an electronic oil pump control method with communication fault adaptive operation according to an embodiment of the present invention;
fig. 2 is a popular schematic diagram of a signal of an electric vehicle electronic oil pump controller acquiring a state quantity according to an embodiment of the invention;
fig. 3 is a flowchart of another control method of an electronic oil pump with communication fault adaptive operation according to an embodiment of the present invention;
FIG. 4 is a flowchart of an adaptive learning method according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating an adaptive bias expert table according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating an adaptive bias expert table according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of an electronic oil pump control system with communication fault adaptive operation according to an embodiment of the present invention;
fig. 8 is a schematic diagram of another electronic oil pump control system with communication fault adaptive operation according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
in the prior art, few monitoring technologies are used for communication faults between an electronic oil pump and a transmission TCU, and no self-adaptive working technology is adopted under the fault condition of the electronic oil pump. When the communication between the electronic oil pump and the transmission TCU is failed, most electronic oil pump products can be shut down to process the failure, the strategy is effective for a double-pump system of a mechanical oil pump and the electronic oil pump, but the strategy is not good enough for a single-pump system only with the electronic oil pump working, the vehicle is directly anchored, and the product reliability and the failure self-adaptability are poor.
In view of this, embodiments of the present invention provide a method for controlling an electronic oil pump with communication failure adaptive operation, which solves the problem that when communication between the electronic oil pump and a transmission TCU fails, the electronic oil pump can still perform adaptive operation, and cannot stop working due to the failure, and can maintain a basic oil supply amount of a working system, so that a lubricated object is not dry-ground, and a vehicle does not have a faltering failure such as a crash, an emergency stop, and a spontaneous combustion.
Fig. 1 is a flowchart of an electronic oil pump control method with communication fault adaptive operation, which is applied to an electronic oil pump controller of an electric vehicle according to an embodiment of the present invention. As shown in fig. 1, the method specifically includes the following steps:
step S102, acquiring the state quantity of the electric automobile; the state quantities include: the rotational speed of the vehicle drive motor, the torque of the vehicle drive motor, the vehicle water temperature, and the vehicle speed.
Specifically, fig. 2 is a schematic diagram illustrating a signal flow of an electric vehicle electronic oil pump controller acquiring a state quantity according to an embodiment of the present invention. As shown in fig. 2, the electronic oil pump controller includes a CAN module and a micro controller Unit (MCU in fig. 2); above the Electronic oil pump controller are an automatic Transmission Control Unit (TCU in fig. 2), a vehicle drive motor, a vehicle body Electronic Stability Program (ESP in fig. 2), and an instrument panel, and below the Electronic oil pump controller is an Electronic oil pump drive motor.
Specifically, as shown in fig. 2, a CAN module in the electronic oil pump controller obtains the rotation speed, torque and vehicle water temperature of the vehicle driving motor through the vehicle driving motor, and obtains the vehicle speed through the ESP.
Step S104, judging whether a required rotating speed signal of the electronic oil pump is received or not; if not, executing step S106; if so, step S110 is performed.
Specifically, as shown in fig. 2, the demanded rotation speed signal is a control signal sent by an automatic transmission control unit (i.e., TCU in fig. 2) of the electric vehicle to the electronic oil pump controller through the CAN bus. The CAN is a Controller Area Network (Controller Area Network), developed by BOSCH, germany, which is known to develop and produce automotive electronics, and finally becomes an international standard (ISO 11898), which is one of the most widely used field buses internationally.
Step S106, calculating the target rotating speed of the electronic oil pump by utilizing a preset expert table based on the state quantity of the electric automobile; the preset expert table is a relation table between the required rotating speed of the electronic oil pump and the state quantity of the electric automobile.
And step S108, adjusting the rotating speed of the electronic oil pump of the electric automobile based on the target rotating speed.
Specifically, as shown in fig. 2, the electronic oil pump controller controls the rotation speed adjustment of the electronic oil pump by controlling the rotation speed adjustment of the electronic oil pump driving motor.
And step S110, controlling the electronic oil pump to adjust the rotating speed based on the required rotating speed signal.
The invention provides an electronic oil pump control method with communication fault self-adaptive operation, which is characterized in that an electronic oil pump controller is internally provided with a preset expert meter, so that the electronic oil pump controller calculates the target rotating speed of an electronic oil pump by using the preset expert meter on the basis of the state quantity of an electric automobile under the condition that a required rotating speed signal of the electronic oil pump is not received, and finally, the electronic oil pump of the electric automobile is subjected to rotating speed adjustment on the basis of the target rotating speed, so that the self-adaptive control under the condition of communication fault is realized, and the technical problems of vehicle anchor dropping and safety reduction caused by communication fault between the electronic oil pump and a transmission control unit in the prior art are solved.
Optionally, the preset expert table includes a first preset expert table and a second preset expert table.
Specifically, the first preset expert table is a relation table between the rotating speed of the vehicle driving motor and the torque of the vehicle driving motor, and the rotating speed of the electronic oil pump;
the second preset expert table is a relation table between the water temperature and the vehicle speed of the vehicle and the corrected value of the rotating speed of the electronic oil pump.
Optionally, step S106 further includes the following steps:
step S1061, obtaining an initial rotating speed of the electronic oil pump based on the torque of the vehicle driving motor, the rotating speed of the vehicle driving motor and a first preset expert table;
step S1062, obtaining a rotating speed correction value of the electronic oil pump based on the water temperature of the vehicle, the vehicle speed and a second preset expert table;
in step S1063, a target rotation speed is obtained based on the initial rotation speed and the rotation speed correction value.
Optionally, after step S108, the method provided in the embodiment of the present invention further includes: measuring the bus current value of the electronic oil pump in real time; judging whether the current value of the bus is greater than a preset current value or not; and if so, adjusting the rotating speed of the electronic oil pump to reduce the bus current value to be below a preset current value.
Optionally, the method provided in the embodiment of the present invention further includes: carrying out self-adaptive learning updating on a preset expert table; the method comprises the following steps: acquiring real-time state quantity of the electric automobile during operation and real-time rotating speed of an electronic oil pump; and updating the preset expert table based on the relation between the real-time state quantity and the real-time rotating speed.
Fig. 3 is a flowchart of another control method of an electronic oil pump with communication fault adaptive operation according to an embodiment of the present invention. As shown in fig. 3, in the method provided by the embodiment of the present invention, the state quantity, i.e., the required rotation speed information of the electronic oil pump, the rotation speed and torque of the vehicle driving motor, the water temperature and the vehicle speed, which are sent from the CAN bus, is received through the CAN module of the electronic oil pump controller.
Then judging whether the required rotating speed information is received or not; and if so, transmitting the required rotating speed information into the MCU of the electronic oil pump controller, and operating the electronic oil pump control program. The electronic oil pump control program is written based on an advanced motor FOC algorithm, a back electromotive force observer is combined, a fault detection program is integrated, the electronic oil pump control program converts received required rotating speed information into a motor driving signal to drive the electronic oil pump driving motor, and the electronic oil pump driving motor starts to work.
After the electronic oil pump is driven, the controller can sample and measure the current bus current, judge the current value, and adjust the rotating speed to control the current if the current exceeds the threshold value of the current, so that the purpose of protection is achieved. Specifically, as shown in fig. 3, the current rotating speed of the electronic oil pump is first obtained, then the current is detected, whether the bus current of the electronic oil pump is lower than a preset threshold value is judged, and if not, the rotating speed is adjusted until the bus calibration current of the electronic oil pump is lower than the preset threshold value.
And if the current is within the threshold value, acquiring the real-time state quantity and the real-time rotating speed of the electronic oil pump, and updating and optimizing the preset expert table based on the relation between the real-time state quantity and the real-time rotating speed.
Optionally, in an embodiment of the present invention, the preset expert table further includes a standard value expert relation table and an adaptive deviation expert table. Specifically, the deviation of the current rotating speed from the standard value in the standard value expert relation table (table1) is calculated, adaptive processing is carried out, and the adaptive processing is written in the adaptive deviation expert table (table 2).
As shown in fig. 3, if it is determined that the required rotational speed information is not received, that is, the CAN module of the electronic oil pump controller does not receive the required rotational speed information sent by the TCU from the CAN bus, the CAN module transmits a feedback signal to the MCU, and the MCU sends a fault signal to the CAN module and outputs the fault signal to the dashboard for fault prompt.
And then in the MCU, calculating the target rotating speed of the electronic oil pump based on the rotating speed of the vehicle driving motor, the torque of the vehicle driving motor, the water temperature of the vehicle and the vehicle speed through a stored preset expert table, and outputting the target rotating speed to a control program of the motor of the electronic oil pump to realize rotating speed control.
And finally, after the electronic oil pump is driven, the controller can sample and measure the current bus current, judge the current value, and adjust the rotating speed to control the current if the current exceeds the threshold value of the current, so that the purpose of protection is achieved.
Fig. 4 is a flowchart of an adaptive learning method according to an embodiment of the present invention. As shown in fig. 4, the first pre-set expert table further includes a first standard value expert relationship table (i.e., tableA1 in fig. 4) and a first adaptive bias expert table (i.e., tableA2 in fig. 4), and the second pre-set expert table further includes a second standard value expert relationship table (i.e., tableB1 in fig. 4) and a second adaptive bias expert table (i.e., tableB2 in fig. 4). Firstly, according to the vehicle working condition, namely the rotating speed of the vehicle driving motor and the torque of the vehicle driving motor, the required rotating speed of the electronic oil pump is calculated through a vehicle motor rotating speed torque-electronic oil pump motor rotating speed relation expert table tableA1 (namely a first standard value expert relation table).
And then judging whether the difference value between the required rotating speed of the electronic oil pump and the first preset standard value is lower than a first preset threshold value or not, and if not, updating the expert table tableA2 (namely the first self-adaptive deviation expert table). The values stored in the input expert table are stored with the weight of the standard value, and the values calculated and output by the expert table are calculated based on the standard value and the weight distribution.
Specifically, fig. 5 is a schematic diagram of a first pre-defined expert table according to an embodiment of the present invention, where the table located at the lower side in fig. 5 is a first standard value expert relationship table, and the table located at the upper side in fig. 5 is a first adaptive deviation expert table. As shown in FIG. 5, the parameters of the electric vehicle operating condition input are the rotation speed of 960rpm, the torque of 95Nm, and the position in the first standard value expert relation table tableA1 is point A. At this time, the rotation speed signal required by the electric pump sent by the TCU is 1800rpm, wherein the standard value closest to the rotation speed is 2000rpm, the corresponding automobile working condition under the standard value is the rotation speed of the motor 1000rpm, and the torque of the motor is 100 Nm. The difference was 200rpm, and the difference was scaled to four standard points to form a first adaptive bias expert table tableA 2. And changing the deviation into a weight, and distributing the rotating speed working condition weight of A to 900rpm, 40%, 1000rpm and 60% for storage. The torque reference values near point a are 80Nm and 100Nm, the deviation is changed into a weight, the torque condition weight of point a is allocated to 80Nm, 33.3%, and allocated to 100Nm, 66.6%, and stored, and a first adaptive deviation expert table tableA2 is generated.
When the communication between the TCU and the CAN module fails, an approximate standard value is searched for through the current rotating speed of the driving motor and the torque of the driving motor in tableA1, the target rotating speed deviation of the electronic oil pump is calculated through the deviation proportion of tableA2, and the target rotating speed of the electronic oil pump is calculated through superposition of the current rotating speed of the driving motor and the torque of the driving motor.
As shown in fig. 4, if the vehicle speed is within the threshold value, the required rotation speed of the electronic oil pump is corrected by the vehicle speed and the water temperature. Specifically, the correction required rotating speed of the electronic oil pump is calculated through a correction expert table tableB1 (namely a second standard value expert relation table) of the relationship between the vehicle speed and the water temperature and the rotating speed of the motor of the electronic oil pump. And judging whether the difference value between the corrected required rotating speed of the electronic oil pump and the second preset standard value is lower than a second preset threshold value or not, and if not, updating the expert table tableB2 (namely the second self-adaptive deviation expert table).
Fig. 6 is a schematic diagram of a second predetermined expert table according to an embodiment of the present invention, in which the lower table in fig. 6 is a second standard value expert relationship table, and the upper table in fig. 6 is a second adaptive bias expert table. As shown in FIG. 6, the parameters of the electric vehicle for correcting the working condition are that the water temperature is 88 ℃, the vehicle speed is 90km/h, and the position in the second standard value expert relation table tableB1 is point B. At the moment, the rotation speed signal required by the electric pump sent by the TCU is 2000rpm, wherein the standard value closest to the rotation speed is 2200rpm, and the corresponding automobile is corrected to have the water temperature of 90 ℃ and the automobile speed of 100km/h under the standard value. The difference was 200rpm, and the difference was scaled to four standard points to form a second adaptive bias expert table tableB 2. And changing the deviation into weight, and storing the rotating speed working condition weight of A, which is distributed to 90 ℃, 80 percent and 80 ℃,20 percent. The torque reference values near the point A are 80km/h and 100km/h, the deviation is changed into weight, the weight of the torque working condition of the point A is distributed to 80km/h and 50 percent and is distributed to 100km/h and 50 percent, the weight is stored, and a second adaptive deviation expert table tableB2 is generated.
When the communication between the TCU and the CAN module fails, an initial value is determined through tableA1 and tableA2, an approximate standard value is searched in a correction expert table tableB1 through the current correction variable driving water temperature and the vehicle speed, the target rotating speed deviation of the electronic oil pump is calculated through the deviation proportion of the correction expert table tableB2, and the final target rotating speed of the electronic oil pump is calculated through superposition of the target rotating speed deviation and the deviation proportion.
Optionally, the method provided in the embodiment of the present invention further includes: and if the required rotating speed signal of the electronic oil pump is judged not to be received, sending a fault signal to an instrument panel of the electric automobile so as to enable the instrument panel to display the fault signal.
As shown in fig. 2, when a communication fault occurs, that is, the electronic oil pump controller cannot receive the TCU and send a required rotation speed signal, the MCU of the electronic oil pump controller feeds back a fault signal, transmits the fault signal to the CAN bus through the CAN module, and transmits the fault signal to the dashboard of the electric vehicle through the CAN bus, thereby implementing a fault information prompt function.
The embodiment of the invention provides an electronic oil pump control method and system with communication fault self-adaptive operation, wherein whether an electronic oil pump rotating speed control signal sent by a transmission TCU is received or not is detected through a CAN module of an electronic oil pump controller, if the electronic oil pump rotating speed control signal is received, the relation between the automobile driving motor rotating speed, the automobile driving motor torque and the electronic oil pump rotating speed is counted, and a preset expert table is arranged in the controller through a self-adaptive learning algorithm according to a preset standard value, so that the learning and updating of a real-time data relation are realized. And receiving the water temperature and the vehicle speed as correction variables, and performing adaptive learning and updating on the correction expert table. If the electronic oil pump rotating speed control signal is not received, the target rotating speed of the electronic oil pump is calculated through the expert table and the correction expert table according to the received rotating speed of the driving motor, the torque of the driving motor, the water temperature and the vehicle speed, and the self-adaptive control under the communication fault condition is realized. The main defect of the prior art is that the self-adaptive control problem of the electronic oil pump under the communication fault can not be realized, and the electronic oil pump can be stopped when the communication fault occurs. According to the embodiment of the invention, the target rotating speed of the electronic oil pump is calculated by calling the preset expert tables, namely the expert table and the correction expert table, so that the self-adaptive operation is realized when the communication fault between the TCU and the electronic oil pump occurs, the defect of the communication fault of the electronic oil pump is overcome, and the reliability, the safety and the self-adaptability of the system are improved.
Furthermore, the method provided by the embodiment of the invention is applicable to the electronic oil pump system of the transmission, and the technical scheme can be used as an excellent solution in the fields of automobile steering electronic oil pumps, starting and stopping electronic oil pumps and the like. The embodiment of the invention can monitor the current motor running state in real time aiming at the closed-loop control of current detection, can realize real-time monitoring, even if the current motor running state is corrected, enables the electronic oil pump system to work under good conditions all the time, and improves the safety of the whole system.
Example two:
fig. 7 is a schematic diagram of an electronic oil pump control system with communication fault adaptive operation, which is applied to an electronic oil pump controller of an electric vehicle, according to an embodiment of the present invention. As shown in fig. 7, the control system includes: the device comprises an acquisition module 10, a judgment module 20, a calculation module 30 and a control module 40.
Specifically, the obtaining module 10 is configured to obtain a state quantity of the electric vehicle; the state quantities include: the rotational speed of the vehicle drive motor, the torque of the vehicle drive motor, the vehicle water temperature, and the vehicle speed.
The judging module 20 is used for judging whether a required rotating speed signal of the electronic oil pump is received or not; the required rotating speed signal is a control signal sent to an electronic oil pump controller by an automatic gearbox control unit of the electric automobile through a CAN bus.
The calculation module 30 is used for calculating the target rotating speed of the electronic oil pump by using a preset expert table based on the state quantity of the electric automobile if the required rotating speed signal of the electronic oil pump is judged not to be received; the preset expert table is a relation table between the required rotating speed of the electronic oil pump and the state quantity of the electric automobile.
Optionally, the preset expert table comprises a first preset expert table and a second preset expert table; the first preset expert table is a relation table between the rotating speed of the vehicle driving motor and the torque of the vehicle driving motor and the rotating speed of the electronic oil pump; the second preset expert table is a relation table between the water temperature and the vehicle speed of the vehicle and the corrected value of the rotating speed of the electronic oil pump.
And the control module 40 is used for adjusting the rotating speed of the electronic oil pump of the electric automobile based on the target rotating speed.
The invention provides an electronic oil pump control system with communication fault self-adaptive operation, which is characterized in that an electronic oil pump controller is internally provided with a preset expert meter, so that the electronic oil pump controller calculates the target rotating speed of an electronic oil pump by using the preset expert meter on the basis of the state quantity of an electric automobile under the condition that a required rotating speed signal of the electronic oil pump is not received, and finally, the electronic oil pump of the electric automobile is subjected to rotating speed adjustment on the basis of the target rotating speed, so that the self-adaptive control under the condition of communication fault is realized, and the technical problems of vehicle anchor dropping and safety reduction caused by communication fault between the electronic oil pump and a transmission control unit in the prior art are solved.
Alternatively, fig. 8 is a schematic diagram of another electronic oil pump control system with communication fault adaptive operation according to an embodiment of the present invention, and as shown in fig. 8, the system further includes: and the updating module 50 is used for performing adaptive learning updating on the preset expert table. Specifically, the update module 50 is further configured to: acquiring real-time state quantity of the electric automobile during operation and real-time rotating speed of an electronic oil pump; and updating the preset expert table based on the relation between the real-time state quantity and the real-time rotating speed.
The embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the processor executes the computer program, the steps of the method in the first embodiment are implemented.
The embodiment of the invention also provides a computer readable medium with a non-volatile program code executable by a processor, wherein the program code causes the processor to execute the method in the first embodiment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. An electronic oil pump control method is applied to an electronic oil pump controller of an electric automobile; it is characterized by comprising:
acquiring the state quantity of the electric automobile; the state quantities include: the rotation speed of a vehicle driving motor, the torque of the vehicle driving motor, the water temperature of the vehicle and the vehicle speed;
judging whether a required rotating speed signal of the electronic oil pump is received or not; the required rotating speed signal is a control signal sent to the electronic oil pump controller by an automatic gearbox control unit of the electric automobile through a CAN bus;
if not, calculating the target rotating speed of the electronic oil pump by using a preset expert table based on the state quantity of the electric automobile; the preset expert table is a relation table between the required rotating speed of the electronic oil pump and the state quantity of the electric automobile;
adjusting the rotating speed of an electronic oil pump of the electric automobile based on the target rotating speed;
the preset expert table comprises a first preset expert table and a second preset expert table; wherein,
the first preset expert table is a relation table between the rotating speed of the vehicle driving motor and the torque of the vehicle driving motor and the rotating speed of the electronic oil pump;
the second preset expert table is a relation table between the water temperature of the vehicle, the vehicle speed and the corrected value of the rotating speed of the electronic oil pump;
based on the state quantity of the electric automobile, calculating the target rotating speed of the electronic oil pump by utilizing a preset expert table, and the method comprises the following steps:
obtaining the initial rotating speed of the electronic oil pump based on the torque of the vehicle driving motor, the rotating speed of the vehicle driving motor and the first preset expert table;
obtaining a rotating speed correction value of the electronic oil pump based on the vehicle water temperature, the vehicle speed and the second preset expert table;
and obtaining the target rotating speed based on the initial rotating speed and the rotating speed correction value.
2. The method according to claim 1, wherein after performing a speed adjustment for an electronic oil pump of the electric vehicle based on the target speed, the method further comprises:
measuring the bus current value of the electronic oil pump in real time;
judging whether the bus current value is larger than a preset current value or not;
and if so, adjusting the rotating speed of the electronic oil pump so as to reduce the bus current value to be below the preset current value.
3. The method of claim 1, further comprising: and if the required rotating speed signal of the electronic oil pump is judged not to be received, sending a fault signal to an instrument panel of the electric automobile so as to enable the instrument panel to display the fault signal.
4. The method of claim 1, further comprising: and if the electronic oil pump is judged to receive the required rotating speed signal, controlling the electronic oil pump to adjust the rotating speed based on the required rotating speed signal.
5. The method of claim 1, further comprising: carrying out self-adaptive learning updating on the preset expert table; the method comprises the following steps:
acquiring real-time state quantity of the electric automobile during operation and real-time rotating speed of the electronic oil pump;
and updating the preset expert table based on the relation between the real-time state quantity and the real-time rotating speed.
6. An electronic oil pump control system is applied to an electronic oil pump controller of an electric automobile; it is characterized by comprising: the device comprises an acquisition module, a judgment module, a calculation module and a control module; wherein,
the acquisition module is used for acquiring the state quantity of the electric automobile; the state quantities include: the rotation speed of a vehicle driving motor, the torque of the vehicle driving motor, the water temperature of the vehicle and the vehicle speed;
the judging module is used for judging whether a required rotating speed signal of the electronic oil pump is received or not; the required rotating speed signal is a control signal sent by an automatic gearbox control unit of the electric automobile to the electronic oil pump controller through a CAN bus;
the calculation module is used for calculating the target rotating speed of the electronic oil pump by using a preset expert table based on the state quantity of the electric automobile if the required rotating speed signal of the electronic oil pump is judged not to be received; the preset expert table is a relation table between the required rotating speed of the electronic oil pump and the state quantity of the electric automobile;
the control module is used for adjusting the rotating speed of the electronic oil pump of the electric automobile based on the target rotating speed;
the preset expert table comprises a first preset expert table and a second preset expert table; wherein,
the first preset expert table is a relation table between the rotating speed of the vehicle driving motor and the torque of the vehicle driving motor and the rotating speed of the electronic oil pump;
the second preset expert table is a relation table between the water temperature of the vehicle, the vehicle speed and the corrected value of the rotating speed of the electronic oil pump;
the computing module is further configured to:
obtaining the initial rotating speed of the electronic oil pump based on the torque of the vehicle driving motor, the rotating speed of the vehicle driving motor and the first preset expert table;
obtaining a rotating speed correction value of the electronic oil pump based on the vehicle water temperature, the vehicle speed and the second preset expert table;
and obtaining the target rotating speed based on the initial rotating speed and the rotating speed correction value.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any of the preceding claims 1 to 5 are implemented when the computer program is executed by the processor.
8. A computer-readable medium having non-volatile program code executable by a processor, wherein the program code causes the processor to perform the method of any of claims 1-5.
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