Oil pump motor speed control method and device and steering oil pump controller

Abstract

The present invention provides a speed control method and device for an oil pump motor and a steering oil pump controller, belonging to the technical field of electric vehicles, and comprising: receiving a control instruction sent by a vehicle controller, and controlling the oil pump motor to operate at a set speed based on the control instruction to provide hydraulic oil to the steering oil tank; obtaining the real-time ambient temperature of the oil pump motor, and the corresponding relationship between the speed deviation of the oil pump motor and the ambient temperature; determining a speed compensation value for the oil pump motor based on the real-time ambient temperature and the corresponding relationship; and correcting the speed deviation of the oil pump motor based on the speed compensation value. The present invention determines the speed compensation value for the oil pump motor based on the real-time ambient temperature of the oil pump motor and the corresponding relationship between the speed deviation of the oil pump motor and the ambient temperature, thereby solving the technical problems of low success probability of cold starting of electric vehicles in extreme low temperature conditions, poor motor starting performance, and high frequency of failures.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a speed control method and device for an oil pump motor and a steering oil pump controller. Background Art

[0002] Pure electric vehicles, as a key component of new energy vehicle development, are increasingly becoming market-oriented and commercially viable. Electric vehicles can encounter a range of starting difficulties during cold starts in low-temperature environments. These issues can stem from multiple factors, including the battery, motor, steering system, and cooling system.

[0003] At low temperatures, increased oil viscosity in the pump motor increases the motor load, which in turn increases the motor starting current and prolongs the startup time. Furthermore, changes in oil viscosity can affect the motor's speed stability, increasing the incidence of speed deviation faults in the pump motor.

[0004] Therefore, existing electric vehicles have problems such as low success probability of cold starting under extreme low temperature conditions, poor motor starting performance, and high frequency of failures. Summary of the Invention

[0005] In view of this, it is necessary to provide a speed control method and device for an oil pump motor and a steering oil pump controller to solve the technical problems of low success probability of cold starting of electric vehicles under extreme low temperature conditions, poor motor starting performance, and high frequency of failures.

[0006] In order to solve the above problems, the present invention provides a method for controlling the speed of an oil pump motor, comprising:

[0007] Receive control instructions from the vehicle controller, and control the oil pump motor to operate at a set speed based on the control instructions to supply hydraulic oil to the steering oil tank;

[0008] Obtain the real-time ambient temperature of the oil pump motor and the corresponding relationship between the speed deviation of the oil pump motor and the ambient temperature;

[0009] determining a speed compensation value of the oil pump motor based on the real-time ambient temperature and the corresponding relationship;

[0010] The speed deviation of the oil pump motor is corrected based on the speed compensation value.

[0011] In one possible implementation, the method for controlling the speed of the oil pump motor further includes:

[0012] When it is determined that the vehicle has a steering demand and the steering oil pump controller fails, start the low-pressure pump group;

[0013] The low-pressure pump group is used to drive the steering device to work based on the control instructions sent by the low-pressure controller.

[0014] In one possible implementation, the corresponding relationship between the speed deviation of the oil pump motor and the ambient temperature is obtained based on the following steps:

[0015] Obtain the speed deviation of the oil pump motor at different ambient temperatures;

[0016] The speed deviation of the oil pump motor at different ambient temperatures is fitted with a polynomial to obtain the corresponding relationship between the speed deviation of the oil pump motor and the ambient temperature.

[0017] In one possible implementation, the method for controlling the speed of the oil pump motor further includes:

[0018] After correcting the speed deviation of the oil pump motor, the real-time speed of the oil pump motor is obtained;

[0019] If it is determined based on the set speed, the real-time speed of the oil pump motor and the speed compensation value that the oil pump motor has failed, an alarm is issued.

[0020] In one possible implementation, determining that the oil pump motor has failed based on the set speed, the real-time speed of the oil pump motor, and the speed compensation value includes:

[0021] If it is determined that the result of subtracting the real-time speed of the oil pump motor and the speed compensation value from the set speed is less than or equal to a preset threshold, it is determined that the oil pump motor has failed.

[0022] In one possible implementation, the strategy optimization method is applied in an environment below -15 degrees Celsius.

[0023] On the other hand, the present invention also provides a speed control device for an oil pump motor, comprising:

[0024] A control module is configured to receive control instructions from a vehicle controller and control the oil pump motor to operate at a set speed based on the control instructions to supply hydraulic oil to the steering oil tank;

[0025] An acquisition module is used to obtain the real-time ambient temperature of the oil pump motor and the corresponding relationship between the speed deviation of the oil pump motor and the ambient temperature;

[0026] a compensation calculation module, configured to determine a speed compensation value of the oil pump motor based on the real-time ambient temperature and the corresponding relationship;

[0027] The correction module is used to correct the speed deviation of the oil pump motor based on the speed compensation value.

[0028] On the other hand, the present invention also provides a steering oil pump controller, comprising a memory and a processor, wherein:

[0029] The memory is used to store programs;

[0030] The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps of the speed control method for the oil pump motor as described in any one of the above.

[0031] On the other hand, the present invention also provides an electric vehicle, comprising: a vehicle controller, an oil pump motor, a steering oil tank, and the above-mentioned steering oil pump controller;

[0032] The vehicle controller is communicatively connected with the steering oil pump controller;

[0033] The oil pump motor is electrically connected to the steering oil pump controller;

[0034] The steering oil tank is connected to the oil pump motor via an oil circuit.

[0035] In a possible implementation, the electric vehicle further includes: a steering low-pressure pump group, a steering device, and a low-pressure controller;

[0036] The steering low-pressure pump group is connected to the oil pump motor and the steering device through an oil circuit;

[0037] The low-pressure controller is electrically connected to the steering low-pressure pump group.

[0038] The beneficial effects of adopting the above-mentioned implementation method are as follows: the speed control method, device and steering oil pump controller of the oil pump motor provided by the present invention determine the speed compensation value of the oil pump motor by obtaining the real-time ambient temperature of the oil pump motor and the correspondence between the speed deviation of the oil pump motor and the ambient temperature, and correct the speed deviation of the oil pump motor based on the speed compensation value; the method provided by the present invention can analyze the actual range of the speed deviation of the oil pump motor under low temperature conditions, and compensate for the speed deviation appropriately according to the analysis results, so as to realize the temperature compensation mechanism of the speed deviation fault triggering logic, and effectively optimize the speed deviation fault triggering logic to avoid the small speed fluctuation caused by the viscosity of the oil product triggering the fault alarm, reduce the risk of fault triggering, and improve the stability and reliability of the system under low temperature conditions, thereby solving the technical problems of low success probability of cold starting of electric vehicles under extreme low temperature conditions, poor motor starting performance and high frequency of faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A flow chart of an embodiment of a method for controlling the speed of an oil pump motor provided by the present invention;

[0041] Figure 2 A structural diagram of the control system corresponding to the oil pump controller provided by the present invention;

[0042] Figure 3 A functional block diagram of an embodiment of a speed control device for an oil pump motor provided by the present invention;

[0043] Figure 4 This is a schematic structural diagram of an embodiment of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0044] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0045] In the description of the embodiments of the present application, unless otherwise specified, “a plurality of” means two or more.

[0046] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or device comprising a series of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not explicitly listed or inherent to these processes, methods, products or devices.

[0047] The naming or numbering of the steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The execution order of the named or numbered process steps can be changed according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0048] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] The present invention provides a method and device for controlling the speed of an oil pump motor and a steering oil pump controller, which are described below respectively.

[0050] like Figure 1 As shown, the present invention provides a speed control method for an oil pump motor, comprising:

[0051] S101, receiving a control instruction sent by a vehicle controller, and controlling the oil pump motor to operate at a set speed based on the control instruction to supply hydraulic oil to the steering oil tank;

[0052] S102, obtaining the real-time ambient temperature of the oil pump motor and the corresponding relationship between the speed deviation of the oil pump motor and the ambient temperature;

[0053] S103, determining a speed compensation value of the oil pump motor based on the real-time ambient temperature and the corresponding relationship;

[0054] S104 : Correcting the speed deviation of the oil pump motor based on the speed compensation value.

[0055] It is understood that the speed control method of the oil pump motor provided by the present invention is applied to the steering oil pump controller of an electric vehicle, which includes Figure 2 Shown are: a vehicle controller 201 (VCU), a steering oil pump controller 202 (DCAC), a steering oil pump motor 203 and a steering oil tank 204 .

[0056] The vehicle controller 201 is used to send the information required by the system to the steering pump controller 202 via the CAN (Controller Area Network) protocol.

[0057] The steering oil pump controller 202 receives control commands and sends feedback messages from the vehicle controller 201 according to the system protocol. The oil pump motor 203, controlled by the high-pressure steering oil pump controller 202, generates power to assist the driver in steering. The steering oil tank 204 supplies hydraulic oil to the steering oil pump motor 203. The low-voltage pump unit is powered by a battery 208, and the vehicle power distribution box 207 distributes power to the system's low-voltage components.

[0058] In some embodiments, the speed control method of the oil pump motor further includes:

[0059] When it is determined that the vehicle has a steering demand and the steering oil pump controller 202 fails, the low-pressure pump group is started;

[0060] The low-pressure pump group is used to drive the steering device 209 to work based on the control instructions sent by the low-pressure controller 206.

[0061] It is understood that the low-pressure pump group is used to start the low-pressure pump group when the vehicle has a steering demand and the high-pressure steering oil pump controller 202 fails. The low-pressure controller 206 is used to control the operation of the low-pressure pump group.

[0062] In some embodiments, the corresponding relationship between the speed deviation of the oil pump motor 203 and the ambient temperature is obtained based on the following steps:

[0063] Obtaining the speed deviation of the oil pump motor 203 at different ambient temperatures;

[0064] A polynomial fitting is performed on the rotation speed deviation of the oil pump motor 203 at different ambient temperatures to obtain a corresponding relationship between the rotation speed deviation of the oil pump motor 203 and the ambient temperature.

[0065] As you can see, first, a temperature sensor is integrated into the system to monitor the motor's surrounding temperature in real time. Then, motor speed data is collected under different ambient temperatures, including both normal and low-temperature conditions. This data is analyzed to identify the relationship between temperature and speed deviation, and to determine the reasonable range of speed deviation under different temperatures.

[0066] Based on the data analysis results, a mathematical equation is established between temperature and speed deviation, that is, the corresponding relationship between speed deviation and temperature. This mathematical equation should be able to reflect the changing law of speed deviation under different temperatures and provide a basis for subsequent compensation calculations. The mathematical equation between temperature and speed deviation is as follows:

[0067]

[0068] In the formula, considering the influence of temperature, n(t) in the above formula will change at different temperatures. n(t) represents the corrected speed value or speed compensation value, and n(t) is a function of t.

[0069] Specifically: The first step is to determine a set of temperature points for testing based on the defined working environment temperature of the oil pump and the vehicle. For the present invention, the temperature points at low temperatures should be relatively dense. For example, if the required working environment temperature is -20°C, the difference between the two test temperature points can be 2°C. The second step is to conduct a pump operation test at each temperature point defined above to test the speed deviation. Before the test, the pump needs to be fully stationary to ensure that it is the same as the ambient temperature. The third step is to substitute the data at each temperature point into the above compensation formula and use the least squares method to determine the parameters. b ki The obtained parameters b ki Save as a database.

[0070] In some embodiments, the speed control method of the oil pump motor further includes:

[0071] After correcting the speed deviation of the oil pump motor 203, the real-time speed of the oil pump motor 203 is obtained;

[0072] When it is determined based on the set speed, the real-time speed of the oil pump motor 203 and the speed compensation value that the oil pump motor 203 has failed, an alarm is issued.

[0073] In some embodiments, determining that the oil pump motor 203 has failed based on the set speed, the real-time speed of the oil pump motor 203 and the speed compensation value includes:

[0074] When it is determined that the result of subtracting the real-time speed of the oil pump motor 203 and the speed compensation value from the set speed is less than or equal to a preset threshold, it is determined that the oil pump motor 203 has failed.

[0075] Understandably, in low-temperature environments, the tolerance for motor speed deviation may need to be adjusted accordingly. By monitoring ambient temperature and motor status, the logic threshold for triggering a speed deviation fault can be dynamically adjusted. This prevents the control system from falsely triggering faults when the motor speed varies within the allowable deviation range, thus reducing unnecessary downtime and maintenance.

[0076] In some embodiments, the strategy optimization method is applied in an environment below -15 degrees Celsius.

[0077] It is understandable that when the oil pump of an electric vehicle is in a low-temperature environment, the viscosity of the oil will affect the normal operation of the motor and may even cause damage to the motor. The method provided by the present invention is used to analyze the actual range of speed deviation under low-temperature conditions, and the speed deviation is appropriately compensated according to the analysis results, thereby realizing a temperature compensation mechanism for the speed deviation fault triggering logic. This can effectively optimize the speed deviation fault triggering logic to avoid the fault alarm being triggered by small speed fluctuations caused by the viscosity of the oil, reduce the risk of fault triggering, improve the stability and reliability of the system under low-temperature conditions, and avoid customer complaints.

[0078] In some embodiments, the present invention provides a method for controlling the speed of an oil pump motor, including:

[0079] 1. Introducing temperature compensation mechanism:

[0080] A temperature factor is introduced into the speed deviation judgment logic of the oil pump motor 203. The speed deviation judgment standard is adjusted in real time according to the ambient temperature of the oil pump motor 203. When the ambient temperature is low, the speed deviation tolerance range is appropriately increased. The specific method is divided into the following steps:

[0081] a. Integration of temperature sensor:

[0082] First, a temperature sensor is integrated into the system to detect the temperature of the motor machine's surrounding environment in real time.

[0083] b. Temperature data collection and analysis:

[0084] Collect motor speed data at different ambient temperatures, including data under normal operating conditions and low-temperature conditions;

[0085] The collected data are analyzed to find out the relationship between temperature and speed deviation, and to determine the reasonable range of speed deviation at different temperatures.

[0086] c. Establish temperature compensation model:

[0087] Based on the data analysis results, a mathematical equation between temperature and speed deviation is established. This mathematical equation should be able to reflect the changing pattern of speed deviation under different temperatures and provide a basis for subsequent compensation calculations. The mathematical equation between temperature and speed deviation is as follows:

[0088]

[0089] In the formula, considering the influence of temperature, n(t) in the above formula will change at different temperatures. n(t) represents the corrected speed value or speed compensation value, and n(t) is a function of t.

[0090] Specifically: The first step is to determine a set of temperature points for testing based on the defined working environment temperature of the oil pump and the vehicle. For the present invention, the temperature points at low temperatures should be relatively dense. For example, if the required working environment temperature is -20°C, the difference between the two test temperature points can be 2°C. The second step is to conduct a pump operation test at each temperature point defined above to test the speed deviation. Before the test, the pump needs to be fully stationary to ensure that it is the same as the ambient temperature. The third step is to substitute the data at each temperature point into the above compensation formula and use the least squares method to determine the parameters. b ki The obtained parameters b ki Save as a database.

[0091] d. Real-time compensation calculation:

[0092] During system operation, the temperature sensor data is read in real time, and the speed deviation compensation value at the current temperature is calculated based on the temperature compensation model. This compensation value can be a fixed value or a dynamic value that changes with temperature. The goal of the compensation strategy is to calibrate the speed deviation at different temperatures to reduce false alarms caused by temperature changes. The real-time speed deviation compensation calculation can be calculated using the following formula:

[0093] n y ≥ n req - n r - n ( t )

[0094] Where, n y It is the speed deviation fault triggering threshold set by the current software; n req It is the speed that the vehicle needs to be pumped with according to the demand calculation, that is, the set speed. n r is the speed that the oil pump motor 203 can provide at the current moment, that is, the actual speed, n ( t ) is a corrected speed value calculated based on the current low temperature operating conditions.

[0095] n req The speed is determined by the steering oil flow required by the vehicle steering system and is given by the steering system design. n r It is the real-time speed of the oil pump when it is running.

[0096] e. Adjustment of speed deviation fault judgment logic:

[0097] The calculated speed deviation compensation value is added to the speed deviation judgment logic.

[0098] When a speed deviation value is detected, the speed deviation is first corrected according to the compensation value, and then compared with the set threshold to determine whether a fault alarm is triggered.

[0099] To sum up, the speed control method of the oil pump motor provided by the present invention includes: receiving the control instruction sent by the vehicle controller 201, and controlling the oil pump motor 203 to operate at a set speed based on the control instruction to provide hydraulic oil to the steering oil tank 204; obtaining the real-time ambient temperature of the oil pump motor 203, and the correspondence between the speed deviation of the oil pump motor 203 and the ambient temperature; determining the speed compensation value of the oil pump motor 203 based on the real-time ambient temperature and the correspondence; and correcting the speed deviation of the oil pump motor 203 based on the speed compensation value.

[0100] The speed control method of the oil pump motor provided by the present invention determines the speed compensation value of the oil pump motor 203 by obtaining the real-time ambient temperature of the oil pump motor 203 and the corresponding relationship between the speed deviation of the oil pump motor 203 and the ambient temperature, and corrects the speed deviation of the oil pump motor 203 based on the speed compensation value; the method provided by the present invention can analyze the actual range of the speed deviation of the oil pump motor 203 under low temperature conditions, and compensate for the speed deviation appropriately according to the analysis result, so as to realize the temperature compensation mechanism of the speed deviation fault triggering logic, and effectively optimize the speed deviation fault triggering logic to avoid the small speed fluctuation caused by the viscosity of the oil product triggering the fault alarm, reduce the risk of fault triggering, and improve the stability and reliability of the system under low temperature conditions, thereby solving the technical problems of low success probability of cold starting of electric vehicles under extreme low temperature conditions, poor motor starting performance, and high frequency of faults.

[0101] like Figure 3 As shown, the present invention also provides a speed control device 300 for an oil pump motor, comprising:

[0102] The control module 301 is configured to receive a control instruction from the vehicle controller 201 and control the oil pump motor 203 to operate at a set speed based on the control instruction to supply hydraulic oil to the steering oil tank 204;

[0103] An acquisition module 302 is used to acquire the real-time ambient temperature of the oil pump motor 203 and the corresponding relationship between the speed deviation of the oil pump motor 203 and the ambient temperature;

[0104] a compensation calculation module 303 for determining a speed compensation value of the oil pump motor 203 based on the real-time ambient temperature and the corresponding relationship;

[0105] The correction module 304 is configured to correct the speed deviation of the oil pump motor 203 based on the speed compensation value.

[0106] The speed control device of the oil pump motor provided in the above embodiment can implement the technical solution described in the above embodiment of the speed control method of the oil pump motor. The specific implementation principles of the above modules or units can refer to the corresponding contents in the above embodiment of the speed control method of the oil pump motor, which will not be repeated here.

[0107] The present invention also provides a steering oil pump controller, comprising a memory and a processor, wherein:

[0108] The memory is used to store programs;

[0109] The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps of the speed control method for the oil pump motor as described in any one of the above.

[0110] The present invention also provides an electric vehicle, referring to Figure 2 , including: a vehicle controller 201, an oil pump motor 203, a steering oil tank 204, and the above-mentioned steering oil pump controller 202;

[0111] The vehicle controller 201 is in communication with the steering oil pump controller 202;

[0112] The oil pump motor 203 is electrically connected to the steering oil pump controller 202;

[0113] The steering oil tank 204 is connected to the oil pump motor 203 via an oil circuit.

[0114] Furthermore, there are low-voltage connections between the vehicle controller 201 and the steering oil pump controller 202 and the low-voltage controller 206. There is also a low-voltage connection between the steering oil pump controller 202 and the temperature sensor on the oil pump motor 203. There is a low-voltage connection between the low-voltage controller 206 and the vehicle distribution box 207, the steering low-pressure pump group 205 and the battery 208. There is a high-voltage connection between the steering oil pump controller 202 and the oil pump motor 203.

[0115] In some embodiments, the electric vehicle further comprises: a steering low-pressure pump group 205, a steering device 209 and a low-pressure controller 206;

[0116] The steering low-pressure pump group 205 is connected to the oil pump motor 203 and the steering device 209 through an oil circuit;

[0117] The low-pressure controller 206 is electrically connected to the steering low-pressure pump group 205 .

[0118] It can be understood that the speed control method of the oil pump motor provided by the present invention is applied to the steering oil pump controller 202 of an electric vehicle, which includes: a vehicle controller 201 (VCU), a steering oil pump controller 202 (DCAC), a steering oil pump motor 203, a steering oil tank 204, a steering low-pressure pump group 205, a low-voltage controller 206, a battery 208, and a distribution box.

[0119] The vehicle controller 201 is used to send the information required by the system to the steering pump controller 202 via the CAN protocol.

[0120] The steering oil pump controller 202 is used to receive control instructions from the vehicle controller 201 and send feedback messages according to the system protocol.

[0121] The oil pump motor 203 is controlled by the high-pressure steering oil pump controller 202 to generate power to assist the driver in steering.

[0122] The steering oil tank 204 is used to provide hydraulic oil to the steering oil pump motor 203 .

[0123] The low-pressure pump group is used to start the low-pressure pump group when the vehicle has a steering demand and the high-pressure steering oil pump controller 202 fails.

[0124] The low-pressure controller 206 is used to control the operation of the low-pressure pump group.

[0125] The battery 208 is used to provide power for the low-voltage pump group.

[0126] The vehicle power distribution box 207 is responsible for distributing power to the low-voltage components of the system.

[0127] like Figure 4 As shown, the present invention also provides an electronic device 400 , which may be the steering oil pump controller 202 . The electronic device 400 includes a processor 401 , a memory 402 , and a display 403 . Figure 4 Only some of the components of the electronic device 400 are shown, but it should be understood that implementation of all of the shown components is not required, and more or fewer components may be implemented instead.

[0128] In some embodiments, the memory 402 may be an internal storage unit of the electronic device 400, such as a hard disk or memory of the electronic device 400. In other embodiments, the memory 402 may also be an external storage device of the electronic device 400, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 400.

[0129] Furthermore, the memory 402 may include both an internal storage unit of the electronic device 400 and an external storage device. The memory 402 is used to store application software installed in the electronic device 400 and various data.

[0130] In some embodiments, the processor 401 may be a central processing unit (CPU), a microprocessor, or other data processing chip, configured to execute program codes or process data stored in the memory 402 , such as the speed control method of the oil pump motor in the present invention.

[0131] In some embodiments, display 403 can be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 403 is used to display information on electronic device 400 and to display a visual user interface. Components 401-403 of electronic device 400 communicate with each other via a system bus.

[0132] In some embodiments of the present invention, when the processor 401 executes the speed control program of the oil pump motor in the memory 402, the following steps may be implemented:

[0133] Receives a control instruction from the vehicle controller 201, and controls the oil pump motor 203 to operate at a set speed based on the control instruction to provide hydraulic oil to the steering oil tank 204;

[0134] Acquire the real-time ambient temperature of the oil pump motor 203 and the corresponding relationship between the speed deviation of the oil pump motor 203 and the ambient temperature;

[0135] Determining a speed compensation value of the oil pump motor 203 based on the real-time ambient temperature and the corresponding relationship;

[0136] The rotation speed deviation of the oil pump motor 203 is corrected based on the rotation speed compensation value.

[0137] It should be understood that, when the processor 401 executes the oil pump motor speed control program in the memory 402 , in addition to the above functions, it can also implement other functions. For details, please refer to the description of the corresponding method embodiment above.

[0138] Furthermore, the embodiments of the present invention do not specifically limit the type of electronic device 400 mentioned. The electronic device 400 may be a portable electronic device such as a mobile phone, tablet computer, personal digital assistant (PDA), wearable device, or laptop computer. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices running iOS, Android, Microsoft, or other operating systems. The portable electronic devices mentioned above may also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the present invention, the electronic device 400 may not be a portable electronic device, but rather a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0139] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for controlling the speed of the oil pump motor provided by the above methods is implemented. The method includes:

[0140] Receives a control instruction from the vehicle controller 201, and controls the oil pump motor 203 to operate at a set speed based on the control instruction to provide hydraulic oil to the steering oil tank 204;

[0141] Acquire the real-time ambient temperature of the oil pump motor 203 and the corresponding relationship between the speed deviation of the oil pump motor 203 and the ambient temperature;

[0142] Determining a speed compensation value of the oil pump motor 203 based on the real-time ambient temperature and the corresponding relationship;

[0143] The speed deviation of the oil pump motor 203 is corrected based on the speed compensation value. Those skilled in the art will appreciate that all or part of the process of the above-described method can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a magnetic disk, an optical disk, a read-only memory, or a random access memory.

[0144] The above is a detailed introduction to the oil pump motor speed control method, device and steering oil pump controller provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for technical personnel in this field, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for controlling the speed of an oil pump motor, characterized in that: include: Receive control instructions from the vehicle controller, and control the oil pump motor to operate at a set speed based on the control instructions to supply hydraulic oil to the steering oil tank; Obtain the real-time ambient temperature of the oil pump motor and the corresponding relationship between the speed deviation of the oil pump motor and the ambient temperature; determining a speed compensation value of the oil pump motor based on the real-time ambient temperature and the corresponding relationship; Correcting the speed deviation of the oil pump motor based on the speed compensation value; The speed control method of the oil pump motor further includes: After correcting the speed deviation of the oil pump motor, the real-time speed of the oil pump motor is obtained; issuing an alarm when it is determined based on the set speed, the real-time speed of the oil pump motor and the speed compensation value that the oil pump motor has failed; Determining whether the oil pump motor has failed based on the set speed, the real-time speed of the oil pump motor, and the speed compensation value includes: If it is determined that the result of subtracting the real-time speed of the oil pump motor and the speed compensation value from the set speed is less than or equal to a preset threshold, it is determined that the oil pump motor has failed.

2. The speed control method of the oil pump motor according to claim 1, characterized in that: Also includes: When it is determined that the vehicle has a steering demand and the steering oil pump controller fails, start the low-pressure pump group; The low-pressure pump group is used to drive the steering device to work based on the control instructions sent by the low-pressure controller.

3. The speed control method of the oil pump motor according to claim 1, characterized in that: The corresponding relationship between the speed deviation of the oil pump motor and the ambient temperature is obtained based on the following steps: Obtain the speed deviation of the oil pump motor at different ambient temperatures; The speed deviation of the oil pump motor at different ambient temperatures is fitted with a polynomial to obtain the corresponding relationship between the speed deviation of the oil pump motor and the ambient temperature.

4. The speed control method of the oil pump motor according to any one of claims 1 to 3, characterized in that: The rotation speed control method is applied to an environment below -15 degrees Celsius.

5. A speed control device for an oil pump motor, characterized in that: include: A control module is configured to receive control instructions from a vehicle controller and control the oil pump motor to operate at a set speed based on the control instructions to supply hydraulic oil to the steering oil tank; An acquisition module is used to obtain the real-time ambient temperature of the oil pump motor and the corresponding relationship between the speed deviation of the oil pump motor and the ambient temperature; a compensation calculation module, configured to determine a speed compensation value of the oil pump motor based on the real-time ambient temperature and the corresponding relationship; a correction module, configured to correct a speed deviation of the oil pump motor based on the speed compensation value; The speed control device of the oil pump motor is also used for: After correcting the speed deviation of the oil pump motor, the real-time speed of the oil pump motor is obtained; issuing an alarm when it is determined based on the set speed, the real-time speed of the oil pump motor and the speed compensation value that the oil pump motor has failed; Determining whether the oil pump motor has failed based on the set speed, the real-time speed of the oil pump motor, and the speed compensation value includes: If it is determined that the result of subtracting the real-time speed of the oil pump motor and the speed compensation value from the set speed is less than or equal to a preset threshold, it is determined that the oil pump motor has failed.

6. A steering oil pump controller, characterized in that: comprising a memory and a processor, wherein, The memory is used to store programs; The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps of the speed control method for the oil pump motor according to any one of claims 1 to 4.

7. An electric vehicle, characterized in that: include: A vehicle controller, an oil pump motor, a steering oil tank, and a steering oil pump controller according to claim 6; The vehicle controller is communicatively connected with the steering oil pump controller; The oil pump motor is electrically connected to the steering oil pump controller; The steering oil tank is connected to the oil pump motor via an oil circuit.

8. The electric vehicle according to claim 7, characterized in that: Also includes: Steering low-pressure pump set, steering device and low-pressure controller; The steering low-pressure pump group is connected to the oil pump motor and the steering device through an oil circuit; The low-pressure controller is electrically connected to the steering low-pressure pump group.

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