A method and system for temperature control of a high-pressure electric steering pump motor controller

Abstract

This application discloses a temperature control method and system for a high-voltage electric power steering pump motor controller, relating to the field of new energy vehicle steering technology. The method includes: setting a first temperature threshold for the motor controller, and obtaining a second temperature threshold for the motor controller based on the first temperature threshold; when the temperature of the motor controller is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the current speed of the high-voltage electric power steering pump is greater than the starting speed of the low-voltage emergency power steering pump, obtaining an output current limit corresponding to the current temperature; and taking the smaller value between the current output current limit and the output current limit at the previous moment as the current output current limit. The high-voltage electric power steering pump motor controller temperature control method and system of this application can achieve smooth switching between high and low voltage steering when the temperature of the high-voltage electric power steering pump motor controller is too high, preventing the steering wheel from becoming heavy or rebounding during sharp turns due to sudden changes in power steering.

Description

Technical Field

[0001] This application relates to the field of automotive steering technology, specifically to a method and system for temperature control of a high-voltage electric steering pump motor controller. Background Technology

[0002] Currently, with the rapid development of new energy vehicles, the degree of electrification of vehicle component systems is increasing. Electric power steering has become the mainstream solution for steering systems in new energy vehicles.

[0003] In related technologies, to ensure driving safety and meet regulatory requirements, vehicle steering systems employ a dual-source solution: high-voltage electric power steering plus low-voltage emergency steering. Under normal circumstances, the vehicle uses high-voltage electric power steering to assist steering. When the high-voltage electric power steering system malfunctions and stops, it switches to low-voltage emergency steering to ensure the driver can safely pull over to the side of the road.

[0004] However, when the high-pressure electric power steering pump motor controller fails to overheat and shuts down, the high-pressure electric power steering system will fail. In this case, switching to low-pressure emergency steering will not only fail to achieve a smooth switch of power steering, but will also cause the steering wheel to bounce back and hit the driver's hands during emergency turns, affecting the driver's emergency response, or even causing steering failure and resulting in a driving safety accident. Summary of the Invention

[0005] In view of the deficiencies in the existing technology, the purpose of this application is to provide a temperature control method and system for a high-pressure electric power steering pump motor controller, so as to solve the problem that smooth switching of power steering cannot be achieved in the related technology.

[0006] The first aspect of this application provides a temperature control method for a high-pressure electric steering pump motor controller, which includes the following steps:

[0007] Set a first temperature threshold for the motor controller, and obtain a second temperature threshold for the motor controller based on the first temperature threshold.

[0008] When the temperature of the motor controller is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the current speed of the high-pressure electric steering pump is greater than the starting speed of the low-pressure emergency steering pump, the output current limit corresponding to the current temperature is obtained.

[0009] Take the smaller value between the current output current limit corresponding to the current temperature and the previous output current limit as the current output current limit.

[0010] In some embodiments, obtaining the second temperature threshold of the motor controller based on the first temperature threshold described above specifically includes:

[0011] Set a third temperature threshold for the motor controller, and the third temperature threshold is greater than the first temperature threshold.

[0012] The peak current of the high-pressure electric steering pump motor is used as the output current limit corresponding to the first temperature threshold.

[0013] When the high-voltage electric steering pump outputs peak power according to the low-voltage emergency steering, the corresponding high-voltage electric steering pump motor phase current is obtained, and the rounded value of the phase current is used as the output current limit corresponding to the third temperature threshold.

[0014] Based on the first temperature threshold and its corresponding output current limit, and the third temperature threshold and its corresponding output current limit, a linear current reduction curve is obtained;

[0015] The second temperature threshold mentioned above is the temperature corresponding to the phase current in the linear current drop curve mentioned above.

[0016] In some embodiments, setting a third temperature threshold for the motor controller specifically includes:

[0017] Set a temperature threshold difference, and use the sum of the first temperature threshold and the temperature threshold difference as the third temperature threshold.

[0018] In some embodiments, after taking the smaller value between the output current limit corresponding to the current temperature and the output current limit at the previous moment as the output current limit at the current moment, the method further includes:

[0019] If the duration for which the temperature of the motor controller drops to less than or equal to the first temperature threshold does not reach the preset duration, then the temperature at the moment before the start of the duration is taken as the continuous temperature, and the output current limit corresponding to the continuous temperature is taken as the output current limit at the current moment.

[0020] If the duration for which the temperature of the motor controller drops to less than or equal to the first temperature threshold reaches a preset duration, the peak current of the high-pressure electric steering pump motor will be used as the output current limit at the current moment.

[0021] In some embodiments, after taking the smaller value between the output current limit corresponding to the current temperature and the output current limit at the previous moment as the output current limit at the current moment, the method further includes:

[0022] If the duration for which the temperature of the motor controller drops to less than or equal to the first temperature threshold does not reach the preset duration, then the output current limit of the previous moment shall be used as the output current limit of the current moment.

[0023] If the duration for which the temperature of the motor controller drops to less than or equal to the first temperature threshold reaches a preset duration, the peak current of the high-pressure electric steering pump motor will be used as the output current limit at the current moment.

[0024] In some embodiments, when the temperature of the motor controller is less than or equal to a first temperature threshold, the peak current of the high-voltage electric steering pump motor is used as the output current limit at the current moment.

[0025] In some embodiments, when the temperature of the motor controller exceeds a second temperature threshold, the motor controller stops operating, low-pressure emergency steering control is activated, and a fault for over-temperature shutdown of the high-pressure electric steering pump motor controller is reported.

[0026] In some embodiments, when the temperature of the motor controller is greater than a first temperature threshold and less than or equal to a second temperature threshold, and the current speed of the high-pressure electric steering pump is less than or equal to the starting speed of the low-pressure emergency steering pump, the motor controller stops operating and the low-pressure emergency steering control is activated.

[0027] In some embodiments, after obtaining the current output current limit, the method further includes:

[0028] Obtain the load current;

[0029] The high-voltage electric steering pump motor is controlled to operate based on the smaller value between the load current and the current output current limit.

[0030] A second aspect of this application provides a temperature control system for a high-pressure electric steering pump motor controller based on the above-described control method, comprising:

[0031] The first acquisition module is used to set a first temperature threshold of the motor controller and acquire a second temperature threshold of the motor controller based on the first temperature threshold.

[0032] The second acquisition module is used to acquire the output current limit corresponding to the current temperature when the temperature of the motor controller is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the current speed of the high-pressure electric steering pump is greater than the starting speed of the low-pressure emergency steering pump.

[0033] The current limiting module is used to take the smaller value between the current temperature-corresponding output current limit and the previous time-to-date output current limit as the current time-to-date output current limit.

[0034] The beneficial effects of the technical solution provided in this application include:

[0035] The high-pressure electric power steering pump motor controller temperature control method and system of this application sets a first temperature threshold for the motor controller and obtains a second temperature threshold based on the first temperature threshold. When the temperature of the motor controller is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the current speed of the high-pressure electric power steering pump is greater than the starting speed of the low-pressure emergency power steering pump, the output current limit corresponding to the current temperature is obtained, and the smaller value between the current temperature-corresponding output current limit and the output current limit at the previous moment is taken as the current output current limit. Therefore, when the temperature of the high-pressure electric power steering pump motor controller is too high, smooth switching between high and low pressure steering can be achieved, and the steering wheel will not become heavy or rebound and kick back during sharp turns due to sudden changes in power steering. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a first flowchart of the temperature control method in this embodiment;

[0038] Figure 2 This is the linear current reduction curve of this embodiment;

[0039] Figure 3 This is a second flowchart of the temperature control method in this embodiment. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] This application provides a method for temperature control of a high-pressure electric power steering pump motor controller, which can solve the problem of the inability to achieve smooth switching of power steering in related technologies.

[0042] like Figure 1 As shown, the temperature control method for the high-pressure electric steering pump motor controller in this embodiment specifically includes the following steps:

[0043] S1. Set a first temperature threshold for the motor controller, and obtain a second temperature threshold for the motor controller based on the first temperature threshold. The first temperature threshold is less than the second temperature threshold.

[0044] S2. When the temperature of the motor controller is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the current speed of the high-pressure electric steering pump is greater than the starting speed of the low-pressure emergency steering pump, obtain the output current limit corresponding to the current temperature.

[0045] S3. Take the smaller value between the current output current limit corresponding to the current temperature and the previous output current limit as the current output current limit.

[0046] The temperature control method in this embodiment sets a first temperature threshold for the motor controller and obtains a second temperature threshold based on the first temperature threshold. When the temperature of the motor controller is greater than the first temperature threshold but less than or equal to the second temperature threshold, and the current speed of the high-pressure electric power steering pump is greater than the starting speed of the low-pressure emergency power steering pump, the output current limit corresponding to the current temperature is obtained. The smaller value between the current temperature-corresponding output current limit and the previous moment's output current limit is taken as the current moment's output current limit, thereby controlling the output current to operate within the current moment's output current limit. Therefore, when the temperature of the high-pressure electric power steering pump motor controller is too high, smooth switching between high and low pressure steering can be achieved, preventing the steering wheel from becoming heavy or rebounding during sharp turns due to sudden changes in power steering.

[0047] In some embodiments, two over-temperature thresholds are set by the high-pressure electric power steering pump motor controller. When the controller temperature is below the low-temperature threshold, the controller outputs current not exceeding the peak current to maintain the power steering pump motor at the target speed. When the controller temperature is between the low and high over-temperature thresholds, the controller output current is directly reduced to 50% of the rated current. When the controller temperature is above the high over-temperature threshold, the controller shuts down the power devices, the output current is 0, and the power steering is completely lost. However, the above control process still cannot achieve a smooth switching between high-pressure power steering and low-pressure emergency steering. In sudden emergency situations such as sharp turns, it can still easily cause the steering wheel to become heavy or rebound, affecting the driver's emergency response and causing psychological tension.

[0048] Based on the above embodiments, in this embodiment, obtaining the second temperature threshold of the motor controller according to the first temperature threshold specifically includes the following steps:

[0049] First, a third temperature threshold is set for the motor controller, and this third temperature threshold is greater than the first temperature threshold.

[0050] Secondly, the peak current of the high-pressure electric steering pump motor is used as the output current limit corresponding to the first temperature threshold.

[0051] Then, the phase current of the high-voltage electric steering pump motor is obtained when the high-voltage electric steering pump outputs peak power according to the low-voltage emergency steering, and the rounded value of the phase current is used as the output current limit corresponding to the third temperature threshold.

[0052] Finally, based on the first temperature threshold and its corresponding output current limit, and the third temperature threshold and its corresponding output current limit, a linear current reduction curve is obtained. At this point, the slope of the linear current reduction curve can also be obtained.

[0053] The second temperature threshold mentioned above is the temperature corresponding to the phase current in the linear current drop curve mentioned above.

[0054] like Figure 2 As shown, in this embodiment, T1 is the first temperature threshold, T3 is the third temperature threshold, and T1 < T3.

[0055] The slope K of the above linear current-drop curve is: (I max -I min2 ) / (T3-T1).

[0056] Among them, I max I is the peak current of the high-pressure electric steering pump motor. min1 The high-pressure electric steering pump is designed according to the low-pressure emergency steering peak power P. L During output, the corresponding phase current of the high-voltage electric steering pump motor, i.e., I min1 =P L / (1.732×U N ), I min2 For I min1 The rounded value, U N This refers to the rated voltage of the high-pressure electric steering pump motor.

[0057] The second temperature threshold T2 is based on a linear current-decreasing curve with slope K, where the current decreases to I. min1 The corresponding temperature at that time.

[0058] Furthermore, the aforementioned setting of the third temperature threshold for the motor controller specifically includes:

[0059] Set a temperature threshold difference, and use the sum of the first temperature threshold and the temperature threshold difference as the third temperature threshold.

[0060] Optionally, the above temperature threshold difference is 10-20℃.

[0061] In other embodiments, obtaining the second temperature threshold of the motor controller based on the first temperature threshold described above may further include: setting a temperature threshold difference, and using the sum of the first temperature threshold and the temperature threshold difference as the second temperature threshold.

[0062] Subsequently, a linear current reduction curve is obtained based on the first temperature threshold, the peak current of the high-voltage electric power steering pump motor, the second temperature threshold, and the phase current of the high-voltage electric power steering pump motor when the high-voltage electric power steering pump outputs peak power according to the low-voltage emergency steering power output. In this curve, the output current limit corresponding to the first temperature threshold is the peak current of the high-voltage electric power steering pump motor, and the output current limit corresponding to the second temperature threshold is the aforementioned phase current of the high-voltage electric power steering pump motor.

[0063] Preferably, in step S3 above, after taking the smaller value between the output current limit corresponding to the current temperature and the output current limit at the previous moment as the output current limit at the current moment, the following steps are also included:

[0064] If the duration for which the temperature of the motor controller drops to less than or equal to the first temperature threshold does not reach the preset duration, then the temperature at the moment before the start of that duration is taken as the continuous temperature, and the output current limit corresponding to the aforementioned continuous temperature is taken as the output current limit at the current moment.

[0065] Specifically, when the temperature of the motor controller drops to less than or equal to a first temperature threshold, timing begins, and the temperature at the moment before timing begins is acquired as the sustained temperature. Subsequently, the output current limit corresponding to this sustained temperature is used as the output current limit for the current duration. If the timing duration does not reach the preset duration, and the temperature of the motor controller is greater than the first temperature threshold, then the current timing ends.

[0066] If the duration for which the temperature of the motor controller drops to less than or equal to the first temperature threshold reaches a preset duration, the peak current of the high-pressure electric steering pump motor will be used as the output current limit at the current moment.

[0067] Optionally, the preset duration is 10 seconds.

[0068] Optionally, in step S3 above, after taking the smaller value between the output current limit corresponding to the current temperature and the output current limit at the previous moment as the output current limit at the current moment, the method further includes:

[0069] If the duration for which the temperature of the motor controller drops to less than or equal to the first temperature threshold does not reach the preset duration, then the output current limit of the previous moment shall be used as the output current limit of the current moment.

[0070] If the duration for which the temperature of the motor controller drops to less than or equal to the first temperature threshold reaches a preset duration, the peak current of the high-pressure electric steering pump motor will be used as the output current limit at the current moment.

[0071] In other embodiments, after taking the smaller value between the output current limit corresponding to the current temperature and the output current limit at the previous moment as the output current limit at the current moment in step S3, the following steps are also included:

[0072] If the temperature of the motor controller drops to less than or equal to the first temperature threshold, and the duration for which the current speed of the high-pressure electric steering pump is greater than the starting speed of the low-pressure emergency steering pump does not reach the preset duration, then the output current limit of the previous moment will be used as the output current limit of the current moment.

[0073] If the temperature of the motor controller drops to less than or equal to the first temperature threshold, and the current speed of the high-pressure electric steering pump is greater than the starting speed of the low-pressure emergency steering pump for a duration that reaches the preset duration, then the peak current of the high-pressure electric steering pump motor will be used as the current output current limit.

[0074] Based on the above embodiments, in this embodiment, when the temperature of the motor controller is less than or equal to the first temperature threshold, the peak current of the high-pressure electric steering pump motor is used as the output current limit at the current moment.

[0075] In this embodiment, T actual This refers to the current temperature of the high-pressure electric steering pump motor controller. When T... actual When T1 is less than or equal to 1, the high-pressure electric steering pump motor controller adjusts the current output current according to the downstream load. o Control the steering pump motor to operate at its rated speed. o The peak current I allowed by the high-pressure steering pump motor controller shall not exceed max .

[0076] Furthermore, when the temperature of the motor controller exceeds the second temperature threshold, i.e., T... actual When the voltage exceeds T2, the high-pressure electric steering pump motor controller stops operating, controlling the output current I. o If the value is 0, the low-pressure emergency steering control will be activated directly, and the instrument panel will report a fault of overheating shutdown of the high-pressure electric steering pump motor controller.

[0077] Based on the above embodiments, in this embodiment, when the temperature of the motor controller is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the current speed of the high-pressure electric steering pump is less than or equal to the starting speed of the low-pressure emergency steering pump, the motor controller stops running and starts the low-pressure emergency steering control.

[0078] Optionally, after obtaining the current output current limit, the following steps are also included:

[0079] First, obtain the load current.

[0080] Then, the high-voltage electric steering pump motor is controlled to operate using the smaller of the load current and the current output current limit.

[0081] Furthermore, when the temperature of the motor controller is greater than the first temperature threshold and less than or equal to the second temperature threshold, the system also includes: reporting an over-temperature alarm fault for the high-pressure electric steering pump motor controller.

[0082] Specifically, when T1 < T actual When T2 is less than or equal to 2, the high-pressure electric steering pump motor controller controls the output current I. o The system was operated within the specified limits and reported a "high-pressure electric steering pump motor controller over-temperature alarm" fault on the instrument panel.

[0083] Among them, the current temperature T actual Corresponding output current limit I limit =I max -(I max- I min2 (T) actual -T1) / (T3-T1).

[0084] At this point, the high-pressure electric power steering pump is operating in a true linear power reduction (current) range, and the high-pressure electric power steering pump motor controller cannot control the power steering pump motor to maintain its rated speed. If the actual speed of the high-pressure electric power steering pump is n... actual The starting speed n of the low-pressure emergency steering pump is higher than that of the low-pressure emergency steering pump. L Then the high-pressure electric steering pump motor controller continues to operate; if the actual speed n of the high-pressure electric steering pump... actual The starting speed of the low-pressure emergency steering pump is lower than n L If the high-pressure steering pump controller stops, the low-pressure emergency steering pump will be started directly.

[0085] Under the current conditions, if the temperature of the high-pressure electric steering pump motor controller gradually recovers to T... actual If the temperature is ≤T1 and the duration reaches 10 seconds, the high-pressure electric power steering pump can exit the reduced-power operation state and resume normal operation. When the high-pressure electric power steering pump enters the over-temperature shutdown state, to prevent conflict with the low-pressure emergency steering operation, even if the temperature of the high-pressure electric power steering pump motor controller returns to T1... actual If the voltage is ≤T1, the high-pressure electric steering pump will not automatically resume operation and will require a high / low voltage power-off restart.

[0086] In this embodiment, when the high-voltage electric power steering pump motor controller is in the linear current limit power reduction operating range, in order to ensure that the temperature of the high-voltage electric power steering pump motor controller recovers to T as quickly as possible... actual ≤T1, the current limit in the linear power reduction range can only be a monotonically decreasing function, that is, during this operating period, the current limit of the output current at the current moment can only be less than the output current limit I at the previous moment. limit0The current must be small and cannot be greater than the previous output current limit. This continues until the temperature returns to T. actual If ≤T1 and the duration reaches 10s, then I max As a current limit, or if the temperature continues to rise to T actual >T2, causing the high-pressure electric steering pump controller to shut down.

[0087] like Figure 3 As shown, based on the starting speed n of the low-pressure emergency steering pump L and low-pressure emergency steering peak power P L And with the initial power reduction operation flag FLAG1 = 0, the temperature control method in this embodiment specifically includes the following steps:

[0088] A1. Obtain the current temperature T of the high-pressure electric steering pump motor controller. actual ;

[0089] A2. Determine if it is T. actual If ≤T1; if yes, proceed to A3; otherwise, proceed to A9.

[0090] A3. Determine if the power reduction operation flag FLAG1 = 0; if yes, proceed to A4; otherwise, proceed to A5.

[0091] A4. The peak current I of the high-pressure electric steering pump motor max As the current output current limit, control the output current I. o ≤I max And turn to A1.

[0092] A5. Update T actual Reduce to a duration t not exceeding T1;

[0093] A6. Determine if t ≥ 10s; if yes, proceed to A7; otherwise, proceed to A8.

[0094] A7. Reset FLAG1 to 0 and jump to A4.

[0095] A8. Use the temperature at the moment before the start of the duration as the duration temperature, and use the output current limit I1 corresponding to the duration temperature as the output current limit at the current moment to control the output current I. o Less than or equal to the current output current limit, i.e., I o ≤I1, and turn to A14.

[0096] A9. Determine whether T1 < T actual If ≤T2; if yes, turn to A10; otherwise, turn to A17.

[0097] A10. Calculate the output current limit I corresponding to the current temperature. limit ;

[0098] A11. Determine if I limit >I limit0 If yes, turn to A12; otherwise, turn to A13.

[0099] A12. Take I limit =I limit0 ;

[0100] A13. Control output current I o ≤I limit ;

[0101] A14. Determine if the actual speed n of the high-pressure electric steering pump is... actual >n L If yes, turn onto A15; otherwise, turn onto A18.

[0102] A15. The high-pressure electric steering pump motor controller continues to operate;

[0103] A16. Set FLAG1 = 1 and jump to A1.

[0104] A17. Control output current I o =0;

[0105] A18. The high-pressure electric steering pump stops, the low-pressure emergency steering is started, and the process ends.

[0106] This application also provides a temperature control system for a high-voltage electric steering pump motor controller based on the above control method. The system includes a first acquisition module, a second acquisition module, and a current limiting module.

[0107] The first acquisition module is used to set a first temperature threshold of the motor controller and acquire a second temperature threshold of the motor controller based on the first temperature threshold.

[0108] The second acquisition module is used to acquire the output current limit corresponding to the current temperature when the temperature of the motor controller is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the current speed of the high-pressure electric steering pump is greater than the starting speed of the low-pressure emergency steering pump.

[0109] The aforementioned current limiting module is used to take the smaller value between the current temperature-corresponding output current limit and the previous time-to-date output current limit as the current time-to-date output current limit.

[0110] The temperature control system in this embodiment sets a first temperature threshold for the motor controller and obtains a second temperature threshold based on the first temperature threshold. When the temperature of the motor controller is greater than the first temperature threshold but less than or equal to the second temperature threshold, and the current speed of the high-pressure electric power steering pump is greater than the starting speed of the low-pressure emergency power steering pump, the system obtains the output current limit corresponding to the current temperature and takes the smaller value between the current temperature-corresponding output current limit and the output current limit at the previous moment as the current output current limit, thereby controlling the output current to operate within the current output current limit. This not only ensures smooth switching between high and low pressure steering when the high-pressure electric power steering pump motor controller temperature is too high, but also prevents the steering wheel from becoming heavy or rebounding during sharp turns due to sudden changes in power steering.

[0111] Furthermore, the first acquisition module is also used to set a third temperature threshold for the motor controller, wherein the third temperature threshold is greater than the first temperature threshold; the first acquisition module is also used to use the peak current of the high-voltage electric steering pump motor as the output current limit corresponding to the first temperature threshold, and to acquire the phase current of the high-voltage electric steering pump motor when the high-voltage electric steering pump outputs peak power according to the low-voltage emergency steering, and to use the rounded value of the phase current as the output current limit corresponding to the third temperature threshold; and to acquire a linear current reduction curve based on the first temperature threshold and its corresponding output current limit, and the third temperature threshold and its corresponding output current limit.

[0112] Optionally, the temperature control system further includes a low-temperature control module, which is used to use the peak current of the high-pressure electric steering pump motor as the current output current limit when the temperature of the motor controller is less than or equal to a first temperature threshold.

[0113] The high-voltage electric power steering pump motor controller temperature control system of this embodiment is applicable to the above-mentioned temperature control methods and can be used in new energy vehicles including but not limited to battery swapping traction, pure electric engineering vehicles, pure electric sanitation vehicles, and gas-electric traction vehicles. When the high-voltage electric power steering pump motor controller overheats, the switching between high and low voltage steering is smooth. There is no phenomenon of heavy steering or rebounding steering wheel caused by sudden changes in power steering during sharp turns, nor is there a phenomenon of low-voltage emergency steering not starting due to high-voltage power steering not stopping, but the output power of the high-voltage electric power steering pump is less than the output power of low-voltage emergency steering, thus making it difficult for the driver to turn the steering wheel.

[0114] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0115] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0116] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A temperature control method for a high-pressure electric steering pump motor controller, characterized in that, It includes the following steps: Set a first temperature threshold for the motor controller, and obtain a second temperature threshold for the motor controller based on the first temperature threshold; When the temperature of the motor controller is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the current speed of the high-pressure electric steering pump is greater than the starting speed of the low-pressure emergency steering pump, the output current limit corresponding to the current temperature is obtained. Take the smaller value between the current output current limit corresponding to the current temperature and the previous output current limit as the current output current limit.

2. The temperature control method for the high-pressure electric steering pump motor controller as described in claim 1, characterized in that, The second temperature threshold of the motor controller is obtained based on the first temperature threshold, specifically including: Set a third temperature threshold for the motor controller, and the third temperature threshold is greater than the first temperature threshold; The peak current of the high-pressure electric steering pump motor is used as the output current limit corresponding to the first temperature threshold. When the high-voltage electric steering pump outputs peak power according to the low-voltage emergency steering, the corresponding high-voltage electric steering pump motor phase current is obtained, and the rounded value of the phase current is used as the output current limit corresponding to the third temperature threshold. Based on the first temperature threshold and its corresponding output current limit, and the third temperature threshold and its corresponding output current limit, a linear current reduction curve is obtained; The second temperature threshold is the temperature corresponding to the phase current in the linear current-drop curve.

3. The temperature control method for the high-pressure electric steering pump motor controller as described in claim 2, characterized in that, Setting the third temperature threshold for the motor controller specifically includes: Set a temperature threshold difference, and use the sum of the first temperature threshold and the temperature threshold difference as the third temperature threshold.

4. The temperature control method for the high-pressure electric steering pump motor controller as described in claim 1, characterized in that, After taking the smaller value between the current output current limit corresponding to the current temperature and the previous output current limit as the current output current limit, the following is also included: If the duration for which the temperature of the motor controller drops to less than or equal to the first temperature threshold does not reach the preset duration, then the temperature at the moment before the start of that duration is taken as the continuous temperature, and the output current limit corresponding to the continuous temperature is taken as the output current limit at the current moment. If the duration for which the temperature of the motor controller drops to less than or equal to the first temperature threshold reaches a preset duration, the peak current of the high-pressure electric steering pump motor will be used as the output current limit at the current moment.

5. The temperature control method for the high-pressure electric steering pump motor controller as described in claim 1, characterized in that, After taking the smaller value between the current output current limit corresponding to the current temperature and the previous output current limit as the current output current limit, the following is also included: If the duration for which the temperature of the motor controller drops to less than or equal to the first temperature threshold does not reach the preset duration, then the output current limit of the previous moment shall be used as the output current limit of the current moment. If the duration for which the temperature of the motor controller drops to less than or equal to the first temperature threshold reaches a preset duration, the peak current of the high-pressure electric steering pump motor will be used as the output current limit at the current moment.

6. The temperature control method for the high-pressure electric steering pump motor controller as described in claim 1, characterized in that: When the temperature of the motor controller is less than or equal to the first temperature threshold, the peak current of the high-pressure electric steering pump motor is used as the current output current limit.

7. The temperature control method for the high-pressure electric steering pump motor controller as described in claim 1, characterized in that: When the temperature of the motor controller exceeds the second temperature threshold, the motor controller stops operating, low-pressure emergency steering control is activated, and a fault report for over-temperature shutdown of the high-pressure electric steering pump motor controller is submitted.

8. The temperature control method for the high-pressure electric steering pump motor controller as described in claim 1, characterized in that: When the temperature of the motor controller is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the current speed of the high-pressure electric steering pump is less than or equal to the starting speed of the low-pressure emergency steering pump, the motor controller stops running and starts the low-pressure emergency steering control.

9. The temperature control method for the high-pressure electric steering pump motor controller as described in claim 1, characterized in that, After obtaining the current output current limit, the following is also included: Obtain the load current; The high-voltage electric steering pump motor is controlled to operate based on the smaller value between the load current and the current output current limit.

10. A temperature control system for a high-pressure electric steering pump motor controller based on the control method of claim 1, characterized in that, It includes: The first acquisition module is used to set a first temperature threshold of the motor controller and acquire a second temperature threshold of the motor controller based on the first temperature threshold. The second acquisition module is used to acquire the output current limit corresponding to the current temperature when the temperature of the motor controller is greater than the first temperature threshold and less than or equal to the second temperature threshold, and the current speed of the high-pressure electric steering pump is greater than the starting speed of the low-pressure emergency steering pump. The current limiting module is used to take the smaller value between the current temperature-corresponding output current limit and the previous time-to-date output current limit as the current time-to-date output current limit.

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