Control method and device for electric power steering oil pump applied to new energy vehicle

Abstract

The invention provides a control method and device for an electric power steering oil pump applied to a new energy vehicle, and relates to the technical field of new energy vehicles, and the control method comprises the steps that the road mode and the gear state of the new energy vehicle are determined; if the road mode is a non-snowfield mode and the gear state is a forward gear, the current road working condition of the new energy vehicle is determined based on a steering wheel steering torque signal, a steering wheel turning angle signal, a gyroscope signal and a wheel adhesion coefficient sensor signal which are obtained in advance; and determining the rotating speed of the steering oil pump based on the current road working condition and the current vehicle speed of the new energy vehicle. In the mode, the rotating speed of the steering oil pump is determined according to the current road working condition and the current vehicle speed of the new energy vehicle, then operation of the steering oil pump is controlled based on the rotating speed, the control accuracy of the steering oil pump is improved, and the safety of the new energy vehicle is improved.

Description

Technical Field

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

[0002] At present, new energy vehicles on the market generally adopt various electric power steering oil pump speed control schemes. Among them, the scheme that determines the speed of the electric power steering oil pump based on the vehicle speed. The higher the speed, the logic of the control scheme believes that the required steering assist is lower. The steering oil pump reduces the speed after receiving the signal, otherwise the steering oil pump increases the speed; another speed control believes that the steering torque input by the driver to the steering wheel or the steering wheel angle in a short period of time is based on the driver's input of the steering torque or the steering wheel angle in a short period of time. When the driver inputs a larger steering torque or a larger steering wheel angle, the control unit believes that the driver needs a larger steering assist at this time, and the steering oil pump speed increases accordingly, otherwise it decreases.

[0003] At present, most new energy vehicles on the market use a single control method for the electric power steering oil pump, which controls the speed based on the vehicle speed. At the same time, the steering oil pump cannot be accurately controlled based on the driver's input of a large steering torque and steering angle in a short period of time. In addition, the driver's erroneous operation caused by high tension in emergency situations is not fully considered, which may reduce the safety of new energy vehicles. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a control method and device for an electric power steering oil pump applied to new energy vehicles, by determining the speed of the steering oil pump by the current road conditions and the current speed of the new energy vehicle, and then controlling the steering oil pump based on the speed, which not only improves the accuracy of the steering oil pump control but also improves the safety of the new energy vehicle.

[0005] In the first aspect, an embodiment of the present invention provides a control method for an electric power steering oil pump applied to a new energy vehicle, which determines the road mode and gear status of the new energy vehicle; if the road mode is a non-snow mode and the gear status is a forward gear, the current road condition of the new energy vehicle is determined based on the pre-acquired steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal; based on the current road condition and the current speed of the new energy vehicle, the speed of the steering oil pump is determined; based on the speed, an oil pump speed signal is sent to the steering oil pump to control the operation of the steering oil pump.

[0006] In a preferred embodiment of the present invention, the above-mentioned determination of the current road condition of the new energy vehicle based on the pre-acquired steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal includes: determining the driving direction adjustment intention of the new energy vehicle based on the steering wheel steering torque signal and the steering wheel angle signal; determining the driving road condition of the new energy vehicle based on the gyroscope signal and the wheel adhesion coefficient sensor signal; determining the current road condition of the new energy vehicle based on the driving direction adjustment intention and the driving road condition.

[0007] In a preferred embodiment of the present invention, the above-mentioned determination of the driving direction adjustment intention of the new energy vehicle based on the steering wheel steering torque signal and the steering wheel angle signal includes: if the steering wheel steering torque signal is less than or equal to a preset steering torque threshold, and the steering wheel angle signal is less than or equal to a preset angle threshold, then the driving direction adjustment intention is that the new energy vehicle has no intention to adjust the driving direction; if the steering wheel steering torque signal is greater than the preset steering torque threshold, and the steering wheel angle signal is greater than the preset angle threshold, then the driving direction adjustment intention is that the new energy vehicle has an intention to adjust the driving direction.

[0008] In a preferred embodiment of the present invention, the steering torque threshold is 5 Nm, and the turning angle threshold is 3°.

[0009] In a preferred embodiment of the present invention, the above-mentioned determination of the driving road conditions of the new energy vehicle based on the gyroscope signal and the wheel adhesion coefficient sensor signal includes: comparing the coefficient represented by the wheel adhesion coefficient sensor signal with a preset coefficient threshold to obtain a comparison result; determining the position change of the first center of mass position of the current new energy vehicle relative to the second center of mass position before the new energy vehicle is started based on the gyroscope signal; and determining the driving road conditions of the new energy vehicle based on the comparison result and the position change.

[0010] In a preferred embodiment of the present invention, the above-mentioned determination of the driving road condition of the new energy vehicle based on the comparison result and the position change includes: if the comparison result is that the coefficient is greater than or equal to the coefficient threshold, and the offset of the first center of mass position relative to the second center of mass position does not reach a preset value, then the driving road condition is a flat road; if the comparison result is that the coefficient is not equal to the coefficient threshold, and the offset of the first center of mass position relative to the second center of mass position reaches a preset value, then the driving road condition is a slope road.

[0011] In a preferred embodiment of the present invention, the above method also includes: if the coefficient is less than the coefficient threshold, and the first center of mass position is offset by a preset value relative to the second center of mass position and is offset backward, then the driving road condition is an uphill road on a slope road; if the coefficient is greater than the coefficient threshold, and the first center of mass position is offset by a preset value relative to the second center of mass position and is offset forward, then the driving road condition is a downhill road on a slope road.

[0012] In a preferred embodiment of the present invention, the above-mentioned determination of the current road condition of the new energy vehicle based on the driving direction adjustment intention and the driving road condition includes: if the driving direction adjustment intention is that the new energy vehicle has no intention to adjust the driving direction, and the driving road condition is a flat road, then the current road condition is a straight road condition; if the driving direction adjustment intention is that the new energy vehicle has no intention to adjust the driving direction, and the driving road condition is an uphill road on a slope road, then the current road condition is a continuous climbing condition; if the driving direction adjustment intention is that the new energy vehicle has no intention to adjust the driving direction, and the driving road condition is an uphill road on a slope road If the vehicle is on a downhill road, the current road condition is a continuous downhill condition; if the intention to adjust the driving direction is that the new energy vehicle continues to have the intention to adjust the driving direction, and the driving road condition is a flat road, the current road condition is a continuous multi-bend condition; if the intention to adjust the driving direction is that the new energy vehicle continues to have the intention to adjust the driving direction, and the driving road condition is an uphill road on a sloped road, the current road condition is a continuous climbing multi-bend condition; if the intention to adjust the driving direction is that the new energy vehicle continues to have the intention to adjust the driving direction, and the driving road condition is a downhill road on a sloped road, the current road condition is a continuous downhill multi-bend condition.

[0013] In a preferred embodiment of the present invention, the above-mentioned determination of the rotation speed of the steering oil pump based on the current road condition and the current speed of the new energy vehicle includes: when the current speed of the new energy vehicle is within a pre-set first speed range, if the current road condition is one of a straight road condition, a continuous climbing condition, and a continuous climbing multi-bend condition, then the rotation speed of the steering oil pump is determined to be a first speed; if the current road condition is one of a continuous downhill condition, a continuous multi-bend condition, and a continuous downhill multi-bend condition, then the rotation speed of the steering oil pump is determined to be a second speed; when the current speed of the new energy vehicle is within a pre-set second speed range, if the current road condition is a straight road condition, , continuous climbing condition, continuous descent condition, continuous climbing with multiple bends condition and continuous descent with multiple bends condition, then the speed of the steering oil pump is determined to be within the first speed range; if the current road condition is a continuous multi-bend condition, then the speed of the steering oil pump is determined to be within the second speed range; when the current vehicle speed of the new energy vehicle is within a pre-set third speed range, if the current road condition is one of a straight road condition, a continuous climbing condition, a continuous descent condition, a continuous climbing with multiple bends condition and a continuous descent with multiple bends condition, then the speed of the steering oil pump is determined to be the third speed; if the current road condition is a continuous multi-bend condition, then the speed of the steering oil pump is determined to be the fourth speed.

[0014] In a preferred embodiment of the present invention, the first speed range is 0-25 km / h, the second speed range is 25-55 km / h, the third speed range is 55-89 km / h, the first speed is 1100 r / min, the second speed is 1150 r / min, the third speed is 900 r / min, the fourth speed is 950 r / min, the first speed range is 900-1100 r / min, and the second speed range is 950-1100 r / min.

[0015] In a preferred embodiment of the present invention, after determining the rotational speed of the steering oil pump as mentioned above, the method further includes: determining whether the temperature of the steering oil pump is abnormal based on a pre-acquired oil pump temperature signal of the steering oil pump; if there is no temperature abnormality, sending an oil pump speed signal to the steering oil pump based on the rotational speed to control the operation of the steering oil pump.

[0016] In a preferred embodiment of the present invention, the method further comprises: if the road mode is a non-snow mode and the gear state is a reverse gear, sending a rated speed operation signal to the steering oil pump to control the operation of the steering oil pump.

[0017] In a preferred embodiment of the present invention, the method further comprises: if the road mode is the snow mode, sending an idle operation signal to the steering oil pump to control the operation of the steering oil pump.

[0018] In the second aspect, an embodiment of the present invention also provides a control device for an electric power steering oil pump applied to new energy vehicles, including: a mode and state determination module, used to determine the road mode and gear state of the new energy vehicle; a current road condition determination module, used to determine the current road condition of the new energy vehicle based on the pre-acquired steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal if the road mode is a non-snow mode and the gear state is a forward gear; a speed determination module, used to determine the speed of the steering oil pump based on the current road condition and the current speed of the new energy vehicle; a steering oil pump control module, which sends an oil pump speed signal to the steering oil pump based on the speed to control the operation of the steering oil pump.

[0019] In a third aspect, an embodiment of the present invention further provides an electronic device, including a processor and a memory, wherein the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement the control method of the electric power steering oil pump applied to new energy vehicles of the first aspect mentioned above.

[0020] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions prompt the processor to implement the control method of the electric power steering oil pump applied to new energy vehicles according to the first aspect mentioned above.

[0021] The embodiments of the present invention bring the following beneficial effects: The embodiment of the present invention provides a control method and device for an electric power steering oil pump applied to a new energy vehicle, by determining the road mode and gear state of the new energy vehicle, if the road mode is a non-snow mode and the gear state is a forward gear, the current road condition of the new energy vehicle is determined based on the pre-acquired steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal, and the rotation speed of the steering oil pump is determined based on the current road condition and the current speed of the new energy vehicle, and an oil pump rotation speed signal is sent to the steering oil pump based on the rotation speed to control the operation of the steering oil pump. In this method, the rotation speed of the steering oil pump is determined by the current road condition and the current speed of the new energy vehicle, and then the steering oil pump is controlled based on the rotation speed, which not only improves the accuracy of the steering oil pump control but also improves the safety of the new energy vehicle.

[0022] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.

[0023] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A flow chart of a control method for an electric power steering oil pump applied to a new energy vehicle provided by an embodiment of the present invention; Figure 2a A flow chart of another control method for an electric power steering oil pump applied to a new energy vehicle provided by an embodiment of the present invention; Figure 2b A control logic diagram of a steering oil pump provided by an embodiment of the present invention; Figure 3 A flow chart of another control method for an electric power steering oil pump applied to a new energy vehicle provided by an embodiment of the present invention; Figure 4 A schematic diagram of the structure of a control device for an electric power steering oil pump applied to a new energy vehicle provided by an embodiment of the present invention; Figure 5 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] At present, new energy vehicles on the market generally adopt various electric power steering oil pump speed control schemes. Among them, the scheme that determines the speed of the electric power steering oil pump based on the vehicle speed. The higher the speed, the logic of the control scheme believes that the required steering assist is lower. The steering oil pump reduces the speed after receiving the signal, otherwise the steering oil pump increases the speed; another speed control believes that the steering torque input by the driver to the steering wheel or the steering wheel angle in a short period of time is based on the driver's input of the steering torque or the steering wheel angle in a short period of time. When the driver inputs a larger steering torque or a larger steering wheel angle, the control unit believes that the driver needs a larger steering assist at this time, and the steering oil pump speed increases accordingly, otherwise it decreases.

[0028] At present, most new energy vehicles on the market use a single control method for the electric power steering oil pump, which controls the speed based on the vehicle speed. At the same time, the steering oil pump cannot be accurately controlled based on the driver's input of a large steering torque and steering angle in a short period of time. In addition, the driver's erroneous operation caused by high tension in emergency situations is not fully considered, which may reduce the safety of new energy vehicles.

[0029] Based on this, the control method and device of an electric power steering oil pump applied to a new energy vehicle provided in an embodiment of the present invention can determine the road mode and gear state of the new energy vehicle. If the road mode is a non-snow mode and the gear state is a forward gear, the current road condition of the new energy vehicle is determined based on the pre-acquired steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal. Based on the current road condition and the current speed of the new energy vehicle, the speed of the steering oil pump is determined, and an oil pump speed signal is sent to the steering oil pump based on the speed to control the operation of the steering oil pump. In this method, the speed of the steering oil pump is determined by the current road condition and the current speed of the new energy vehicle, and then the steering oil pump is controlled based on the speed, which not only improves the accuracy of the steering oil pump control but also improves the safety of the new energy vehicle.

[0030] To facilitate understanding of this embodiment, a control method for an electric power steering oil pump applied to a new energy vehicle disclosed in an embodiment of the present invention is first introduced in detail.

[0031] Example 1 The embodiment of the present invention provides a control method for an electric power steering oil pump applied to a new energy vehicle. Figure 1 The present invention provides a flow chart of a control method for an electric power steering oil pump applied to a new energy vehicle. Figure 1 As shown, the control method of the electric power steering oil pump applied to new energy vehicles may include the following steps: Step S101, determining the road mode and gear status of the new energy vehicle.

[0032] Among them, the road mode may include: non-snow mode and snow mode, and the gear state may include forward gear and reverse gear.

[0033] Among them, the road mode can be confirmed by the driver of the new energy vehicle through the environment in which the new energy vehicle is located. The driver outputs the ACC (Adaptive Cruise Control) signal to the VCU (Vehicle Control Unit), and the VCU outputs the motor starting speed signal and the transmission gear position signal to start the vehicle.

[0034] Step S102, if the road mode is non-snow mode and the gear state is the forward gear, determine the current road condition of the new energy vehicle based on the pre-acquired steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal.

[0035] Among them, the steering wheel steering torque signal can be detected by a steering system torque sensor, the steering wheel angle signal can be detected by a steering system angle sensor, the gyroscope signal can be detected by a gyroscope signal sensor, and the wheel adhesion coefficient sensor signal can be detected by a wheel adhesion coefficient sensor.

[0036] Among them, by inputting the steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal into the VCU, the VCU determines the current road condition based on the pre-set criteria and the above signals.

[0037] Among them, the current road condition may include a straight road condition, a continuous climbing condition, a continuous downhill condition, a continuous multi-bend condition, a continuous climbing multi-bend condition and a continuous downhill condition.

[0038] Step S103, determining the rotation speed of the steering oil pump based on the current road conditions and the current speed of the new energy vehicle.

[0039] Among them, since different current road conditions and different current vehicle speeds have different requirements for the speed change of the steering oil pump, the speed of the steering oil pump can be determined according to the current road conditions and the current speed of the new energy vehicle.

[0040] Among them, the current vehicle speed can be detected by a speed sensor.

[0041] Step S104: sending an oil pump speed signal to the steering oil pump based on the speed to control the operation of the steering oil pump.

[0042] Among them, the output flow rate is reduced by accurately controlling the steering oil pump to achieve the effect of reducing power and energy saving, thereby avoiding the generation of noise that causes continuous interference to the driver.

[0043] In order to prevent the steering oil pump from running at high speed for a long time and causing excessive temperature to shorten the life of the steering oil pump, the temperature of the steering oil pump can be detected in real time, and the operation of the steering oil pump can be controlled when there is no abnormality in the temperature of the steering oil pump. Furthermore, after determining the speed of the steering oil pump, the method also includes: determining whether the temperature of the steering oil pump is abnormal based on a pre-acquired oil pump temperature signal of the steering oil pump; if there is no temperature abnormality, sending an oil pump speed signal to the steering oil pump based on the speed to control the operation of the steering oil pump.

[0044] The temperature of the steering oil pump can be detected by a temperature sensor. Specifically, the oil pump temperature signal can be sent to the VCU through the temperature sensor. The VCU controls the operation of the steering oil pump based on the temperature of the steering oil pump, thereby reducing the risk of overtemperature caused by continuous operation of the steering oil pump.

[0045] A temperature threshold may be pre-set, and when the temperature represented by the oil pump temperature signal is less than the temperature threshold, it is determined that the temperature is normal, and when the temperature represented by the oil pump temperature signal is greater than or equal to the temperature threshold, it is determined that the temperature is abnormal.

[0046] Preferably, the temperature threshold may be 84°C.

[0047] Among them, when the temperature is abnormal, that is, when the steering oil pump continues to operate in an environment of 84°C or above, when the working pressure reaches 17Mpa, the safety valve of the steering oil pump will unload, ensuring the reliability and service life of the steering oil pump.

[0048] Further, if the road mode is the non-snow mode and the gear state is the reverse gear, a rated speed operation signal is sent to the steering oil pump to control the operation of the steering oil pump.

[0049] Further, if the road mode is the snow mode, an idle operation signal is sent to the steering oil pump to control the operation of the steering oil pump.

[0050] The control method of the electric power steering oil pump applied to new energy vehicles provided by the embodiment of the present invention can determine the road mode and gear state of the new energy vehicle. If the road mode is non-snow mode and the gear state is forward gear, the current road condition of the new energy vehicle is determined based on the pre-acquired steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal. Based on the current road condition and the current speed of the new energy vehicle, the speed of the steering oil pump is determined, and the oil pump speed signal is sent to the steering oil pump based on the speed to control the operation of the steering oil pump. In this method, the speed of the steering oil pump is determined by the current road condition and the current speed of the new energy vehicle, and then the steering oil pump is controlled based on the speed, which not only improves the accuracy of the steering oil pump control but also improves the safety of the new energy vehicle.

[0051] Example 2 An embodiment of the present invention also provides another control method for an electric power steering oil pump applied to new energy vehicles; this method is implemented on the basis of the method in the above embodiment; this method focuses on describing a specific implementation method for determining the current road condition of the new energy vehicle based on pre-acquired steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal.

[0052] Figure 2a A flow chart of another control method for an electric power steering oil pump applied to a new energy vehicle provided by an embodiment of the present invention is shown in FIG. Figure 2a As shown, the current road condition of the new energy vehicle is determined based on the pre-acquired steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal, which may include the following steps: Step S201, determining the driving direction adjustment intention of the new energy vehicle based on the steering wheel steering torque signal and the steering wheel angle signal.

[0053] Specifically, the driving direction adjustment intention of the new energy vehicle is determined based on the steering wheel steering torque signal and the steering wheel angle signal, including: if the steering wheel steering torque signal is less than or equal to a preset steering torque threshold, and the steering wheel angle signal is less than or equal to a preset angle threshold, then the driving direction adjustment intention is that the new energy vehicle has no intention to adjust the driving direction; if the steering wheel steering torque signal is greater than the preset steering torque threshold, and the steering wheel angle signal is greater than the preset angle threshold, then the driving direction adjustment intention is that the new energy vehicle has an intention to adjust the driving direction.

[0054] Among them, the steering torque threshold is 5Nm and the steering angle threshold is 3°.

[0055] It should be noted that the national standard stipulates that the free clearance on the steering wheel of the steering system of a commercial truck should not be greater than 15°. Due to assembly and processing errors, there is a certain deviation in the free clearance of the same vehicle model. Therefore, the embodiment of the present invention measures the free clearance of multiple vehicles of a certain model, and obtains the average free clearance as a basis for avoiding erroneous judgment of the steering system torque sensor. The basis for judging the free clearance here is the average of multiple test results of a certain 6X4 standard-loaded vehicle model of Nanjing Golden Dragon, and the boundary condition for starting the steering oil pump, that is, the angle threshold, is that the left and right steering wheel angle greater than 3° is the effective steering wheel angle input by the driver.

[0056] It should be noted that, taking into account the different steering free clearances between various models, the steering torque input by the driver to the steering wheel must also be considered, and the driver's steering intention is judged by two conditions; according to "GB 17675-2021 Basic Requirements for Automobile Steering Systems", when the electric resistance steering fails, the driver's input to the steering wheel is 450N / m, and when there is electric power steering, it is guaranteed to be 200N / m; taking a certain 6X4 standard-load tractor model of Nanlong as an example, the steering wheel radius is 460mm, the rated power of the steering oil pump is 3KW, and the steering gear power is 110KW; after many tests and comprehensive consideration of various working conditions tests, the minimum steering wheel torque input by the driver used in the embodiment of the present invention is 5N / m, that is, the steering torque threshold is 5N / m.

[0057] Step S202, determining the driving road conditions of the new energy vehicle based on the gyroscope signal and the wheel adhesion coefficient sensor signal.

[0058] Specifically, the driving road condition of the new energy vehicle is determined based on the gyroscope signal and the wheel adhesion coefficient sensor signal, including: comparing the coefficient represented by the wheel adhesion coefficient sensor signal with a pre-set coefficient threshold to obtain a comparison result; determining the position change of the first center of mass position of the current new energy vehicle relative to the second center of mass position before the new energy vehicle is started based on the gyroscope signal; and determining the driving road condition of the new energy vehicle based on the comparison result and the position change.

[0059] Among them, if the comparison result is that the coefficient is greater than or equal to the coefficient threshold, and the offset of the first center of mass position relative to the second center of mass position does not reach a preset value, then the driving road condition is a flat road; if the comparison result is that the coefficient is not equal to the coefficient threshold, and the offset of the first center of mass position relative to the second center of mass position reaches a preset value, then the driving road condition is a slope road.

[0060] Further, if the coefficient is less than the coefficient threshold, and the first center of mass position is offset by a preset value relative to the second center of mass position and is offset backward, the driving road condition is an uphill road on a slope road; if the coefficient is greater than the coefficient threshold, and the first center of mass position is offset by a preset value relative to the second center of mass position and is offset forward, the driving road condition is a downhill road on a slope road.

[0061] Here, the coefficient threshold may be 0.7.

[0062] Step S203, determining the current road condition of the new energy vehicle based on the driving direction adjustment intention and the driving road condition.

[0063] Specifically, if the intention to adjust the driving direction is that the new energy vehicle has no intention to adjust the driving direction, and the driving road condition is a flat road, then the current road condition is a straight road condition; if the intention to adjust the driving direction is that the new energy vehicle has no intention to adjust the driving direction, and the driving road condition is an uphill road on a sloped road, then the current road condition is a continuous climbing condition; if the intention to adjust the driving direction is that the new energy vehicle has no intention to adjust the driving direction, and the driving road condition is a downhill road on a sloped road, then the current road condition is a continuous downhill condition; if the intention to adjust the driving direction is that the new energy vehicle continues to have the intention to adjust the driving direction, and the driving road condition is a flat road, then the current road condition is a continuous multi-bend condition; if the intention to adjust the driving direction is that the new energy vehicle continues to have the intention to adjust the driving direction, and the driving road condition is an uphill road on a sloped road, then the current road condition is a continuous climbing multi-bend condition; if the intention to adjust the driving direction is that the new energy vehicle continues to have the intention to adjust the driving direction, and the driving road condition is an uphill road on a sloped road, then the current road condition is a continuous downhill multi-bend condition.

[0064] For ease of understanding, Figure 2b A control logic diagram of a steering oil pump provided by an embodiment of the present invention, specifically, Figure 2b Take the example where the road mode is the non-snow mode, the gear state is the forward gear, and the current road condition is determined to be a straight road condition.

[0065] like Figure 2bAs shown, in actual application, when the road mode is non-snow mode and the gear state is the forward gear, the steering system torque sensor inputs the detected steering wheel steering torque signal into the VCU, the steering system angle sensor inputs the detected steering wheel angle signal into the VCU, the temperature sensor inputs the detected oil pump temperature signal into the VCU, the steering oil pump inputs the current oil pump speed signal into the VCU, the wheel adhesion coefficient sensor inputs the detected wheel adhesion coefficient into the VCU, the gyroscope signal sensor inputs the detected gyroscope signal into the VCU, and the VCU compares the wheel adhesion coefficient detected by the wheel adhesion coefficient sensor with the coefficient threshold, and compares the gyroscope signal detected by the gyroscope signal sensor with the Determine the position change of the first center of mass position of the current new energy vehicle relative to the second center of mass position before the new energy vehicle is started, and compare the steering wheel angle signal detected by the steering system angle sensor with the angle threshold, and compare the steering wheel steering torque signal detected by the steering system torque sensor with the steering torque threshold, and compare the oil pump temperature signal detected by the temperature sensor with the temperature threshold; when the wheel adhesion coefficient is approximately equal to the coefficient threshold, and the first center of mass position has no large offset relative to the second center of mass position, and the driver does not continuously and uninterruptedly input the torque represented by the steering wheel steering torque signal greater than the steering torque threshold and the angle represented by the steering wheel angle signal greater than the angle threshold, the current road condition is a straight road condition. When the temperature represented by the oil pump temperature signal detected by the temperature sensor is less than the temperature threshold, the speed of the steering oil pump is determined by the current vehicle speed, and an oil pump speed signal is issued based on the speed to control the operation of the steering oil pump. For example, when the current vehicle speed is between 0-25km / h, the steering oil pump speed may be 1100r / min, when the current vehicle speed is between 25-55km / h, the steering oil pump speed may be 900-1100r / min, and when the current vehicle speed is between 55-89km / h, the steering oil pump speed may be 900r / min.

[0066] The control method of the electric power steering oil pump applied to new energy vehicles provided in the embodiment of the present invention can determine the current road condition of the new energy vehicle through the driving direction adjustment intention and the driving road condition, and make a more detailed division of the current road condition, and then obtain a more accurate steering oil pump speed in combination with the current vehicle speed, and then control the operation of the steering oil pump based on the speed, which not only improves the accuracy of the steering oil pump control but also improves the safety of the new energy vehicle.

[0067] Example 3 An embodiment of the present invention also provides another control method for an electric power steering oil pump applied to new energy vehicles; this method is implemented on the basis of the method in the above embodiment; this method focuses on describing the specific implementation method of determining the rotational speed of the steering oil pump based on the current road conditions and the current speed of the new energy vehicle.

[0068] Figure 3 A flow chart of another control method for an electric power steering oil pump applied to a new energy vehicle provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the method of determining the rotation speed of the steering oil pump based on the current road conditions and the current speed of the new energy vehicle may include the following steps: Step S301, when the current vehicle speed of the new energy vehicle is within a preset first speed range, if the current road condition is one of a straight road condition, a continuous climbing condition, and a continuous climbing multi-bend condition, then the speed of the steering oil pump is determined to be a first speed.

[0069] Among them, the first speed range is 0-25 km / h, and the first speed is 1100 r / min.

[0070] Step S302: If the current road condition is one of a continuous downhill condition, a continuous multi-bend condition, and a continuous downhill multi-bend condition, then the rotation speed of the steering oil pump is determined to be a second rotation speed.

[0071] Among them, the second speed is 1150 r / min.

[0072] Step S303, when the current vehicle speed of the new energy vehicle is within the preset second speed range, if the current road condition is one of a straight road condition, a continuous climbing condition, a continuous downhill condition, a continuous climbing condition with multiple bends, and a continuous downhill condition with multiple bends, then it is determined that the speed of the steering oil pump is within the first speed range.

[0073] Among them, the second speed range is 25-55 km / h, and the first speed range is 900-1100 r / min.

[0074] Step S304: if the current road condition is a continuous multi-bend condition, determine that the rotation speed of the steering oil pump is within the second rotation speed range.

[0075] Among them, the second speed range is 950-1100 r / min.

[0076] Step S305, when the current vehicle speed of the new energy vehicle is within a preset third speed range, if the current road condition is one of a straight road condition, a continuous climbing condition, a continuous downhill condition, a continuous climbing condition with multiple bends, and a continuous downhill condition with multiple bends, then the speed of the steering oil pump is determined to be the third speed.

[0077] Among them, the third speed range is 55-89 km / h, and the third speed is 900 r / min.

[0078] Step S306: If the current road condition is a continuous multi-bend condition, determine that the rotation speed of the steering oil pump is a fourth rotation speed.

[0079] Among them, the fourth speed is 950 r / min.

[0080] In actual application, the driver adjusts the state of the whole vehicle to enter the snow mode. Since vehicles generally travel at a lower speed on snowy roads and the wheel adhesion coefficient on snowy roads is low, when the vehicle enters the snow mode, the steering oil pump uses idle operation when driving in forward and reverse gears.

[0081] In actual applications, when the vehicle uses the reverse gear in non-snow mode, since the vehicle speed is generally low when driving through the reverse gear and is mostly operated on flat roads, the steering oil pump runs at the rated speed when performing the reverse gear operation.

[0082] The control method of the electric power steering oil pump applied to new energy vehicles provided in the embodiment of the present invention determines the rotation speed of the steering oil pump through the current road conditions and the current speed of the new energy vehicle, and then controls the operation of the steering oil pump based on the rotation speed, which not only improves the accuracy of the steering oil pump control but also improves the safety of the new energy vehicle.

[0083] Example 4 Corresponding to the above method embodiment, the embodiment of the present invention provides a control device for an electric power steering oil pump applied to a new energy vehicle, Figure 4 A schematic diagram of a control device for an electric power steering oil pump applied to a new energy vehicle provided by an embodiment of the present invention is shown in FIG. Figure 4 As shown, the control device of the electric power steering oil pump applied to the new energy vehicle may include: The mode and state determination module 401 is used to determine the road mode and gear state of the new energy vehicle.

[0084] The current road condition determination module 402 is used to determine the current road condition of the new energy vehicle based on the pre-acquired steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal if the road mode is non-snow mode and the gear state is the forward gear.

[0085] The speed determination module 403 is used to determine the speed of the steering oil pump based on the current road conditions and the current speed of the new energy vehicle.

[0086] The steering oil pump control module 404 sends an oil pump speed signal to the steering oil pump based on the speed to control the operation of the steering oil pump.

[0087] The control device of the electric power steering oil pump applied to the new energy vehicle provided by the embodiment of the present invention determines the road mode and gear state of the new energy vehicle. If the road mode is non-snow mode and the gear state is forward gear, the current road condition of the new energy vehicle is determined based on the pre-acquired steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal. The rotation speed of the steering oil pump is determined based on the current road condition and the current speed of the new energy vehicle, and the oil pump rotation speed signal is sent to the steering oil pump based on the rotation speed to control the operation of the steering oil pump. In this way, the rotation speed of the steering oil pump is determined by the current road condition and the current speed of the new energy vehicle, and then the steering oil pump is controlled based on the rotation speed, which not only improves the accuracy of the steering oil pump control but also improves the safety of the new energy vehicle.

[0088] In some embodiments, the current road condition determination module is also used to determine the driving direction adjustment intention of the new energy vehicle based on the steering wheel steering torque signal and the steering wheel angle signal; determine the driving road conditions of the new energy vehicle based on the gyroscope signal and the wheel adhesion coefficient sensor signal; and determine the current road condition of the new energy vehicle based on the driving direction adjustment intention and the driving road conditions.

[0089] In some embodiments, the current road condition determination module is also used to determine that if the steering wheel steering torque signal is less than or equal to a preset steering torque threshold, and the steering wheel angle signal is less than or equal to a preset angle threshold, then the driving direction adjustment intention is that the new energy vehicle has no intention to adjust the driving direction; if the steering wheel steering torque signal is greater than the preset steering torque threshold, and the steering wheel angle signal is greater than the preset angle threshold, then the driving direction adjustment intention is that the new energy vehicle has the intention to adjust the driving direction.

[0090] In some embodiments, the steering torque threshold is 5 Nm and the steering angle threshold is 3°.

[0091] In some embodiments, the current road condition determination module is also used to compare the coefficient represented by the wheel adhesion coefficient sensor signal with a pre-set coefficient threshold to obtain a comparison result; determine the position change of the first center of mass position of the current new energy vehicle relative to the second center of mass position before the new energy vehicle is started based on the gyroscope signal; and determine the driving road conditions of the new energy vehicle based on the comparison result and the position change.

[0092] In some embodiments, the current road condition determination module is also used to determine that if the comparison result is that the coefficient is greater than or equal to the coefficient threshold, and the offset of the first center of mass position relative to the second center of mass position does not reach a preset value, then the driving road condition is a flat road; if the comparison result is that the coefficient is not equal to the coefficient threshold, and the offset of the first center of mass position relative to the second center of mass position reaches a preset value, then the driving road condition is a slope road.

[0093] In some embodiments, the current road condition determination module is also used to determine that if the coefficient is less than a coefficient threshold, and the first center of mass position is offset by a preset value relative to the second center of mass position and is offset backward, then the driving road condition is an uphill road on a slope road; if the coefficient is greater than the coefficient threshold, and the first center of mass position is offset by a preset value relative to the second center of mass position and is offset forward, then the driving road condition is a downhill road on a slope road.

[0094] In some embodiments, the current road condition determination module is also used to determine that if the intention to adjust the driving direction is that the new energy vehicle has no intention to adjust the driving direction, and the driving road condition is a flat road, then the current road condition is a straight road condition; if the intention to adjust the driving direction is that the new energy vehicle has no intention to adjust the driving direction, and the driving road condition is an uphill road on a sloped road, then the current road condition is a continuous climbing condition; if the intention to adjust the driving direction is that the new energy vehicle has no intention to adjust the driving direction, and the driving road condition is a downhill road on a sloped road, then the current road condition is It is a continuous downhill condition; if the intention to adjust the driving direction is that the new energy vehicle continues to have the intention to adjust the driving direction, and the driving road condition is a flat road, then the current road condition is a continuous multi-bend condition; if the intention to adjust the driving direction is that the new energy vehicle continues to have the intention to adjust the driving direction, and the driving road condition is an uphill road on a slope road, then the current road condition is a continuous climbing multi-bend condition; if the intention to adjust the driving direction is that the new energy vehicle continues to have the intention to adjust the driving direction, and the driving road condition is a downhill road on a slope road, then the current road condition is a continuous downhill multi-bend condition.

[0095] In some embodiments, the speed determination module is also used to determine that the speed of the steering oil pump is a first speed when the current vehicle speed of the new energy vehicle is within a pre-set first speed interval, if the current road condition is one of a straight road condition, a continuous climbing condition, and a continuous climbing multi-bend condition; if the current road condition is one of a continuous downhill condition, a continuous multi-bend condition, and a continuous downhill multi-bend condition, then the speed of the steering oil pump is determined to be a second speed; when the current vehicle speed of the new energy vehicle is within a pre-set second speed interval, if the current road condition is a straight road condition, a continuous climbing condition, or a continuous downhill condition, then the speed of the steering oil pump is determined to be a second speed. , one of the working conditions of continuous climbing with multiple bends and continuous descent with multiple bends, then the speed of the steering oil pump is determined to be within the first speed range; if the current road working condition is a continuous multi-bend working condition, then the speed of the steering oil pump is determined to be within the second speed range; when the current vehicle speed of the new energy vehicle is within a pre-set third speed range, if the current road working condition is one of the working conditions of a straight road, a continuous climbing condition, a continuous descent, a continuous climbing condition with multiple bends and a continuous descent with multiple bends, then the speed of the steering oil pump is determined to be the third speed; if the current road working condition is a continuous multi-bend condition, then the speed of the steering oil pump is determined to be the fourth speed.

[0096] In some embodiments, the first speed range is 0-25 km / h, the second speed range is 25-55 km / h, the third speed range is 55-89 km / h, the first speed is 1100 r / min, the second speed is 1150 r / min, the third speed is 900 r / min, the fourth speed is 950 r / min, the first speed range is 900-1100 r / min, and the second speed range is 950-1100 r / min.

[0097] In some embodiments, the steering oil pump control module is also used to determine whether the steering oil pump has an abnormal temperature based on a pre-acquired oil pump temperature signal of the steering oil pump; if the temperature is not abnormal, an oil pump speed signal is sent to the steering oil pump based on the speed to control the operation of the steering oil pump.

[0098] In some embodiments, the steering oil pump control module is further used to send a rated speed operation signal to the steering oil pump to control the operation of the steering oil pump if the road mode is non-snow mode and the gear state is reverse gear.

[0099] In some embodiments, the steering oil pump control module is further used in the method further comprising: if the road mode is the snow mode, sending an idle operation signal to the steering oil pump to control the operation of the steering oil pump.

[0100] The device provided in the embodiment of the present invention has the same implementation principle and technical effects as those of the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment.

[0101] Example 5 The embodiment of the present invention also provides an electronic device for executing the control method of the electric power steering oil pump applied to new energy vehicles; see Figure 5 A structural schematic diagram of an electronic device is shown, which includes a memory 500 and a processor 501, wherein the memory 500 is used to store one or more computer instructions, and the one or more computer instructions are executed by the processor 501 to implement the above-mentioned control method of the electric power steering oil pump applied to new energy vehicles.

[0102] Further, Figure 5 The electronic device shown further includes a bus 502 and a communication interface 503 , and the processor 501 , the communication interface 503 and the memory 500 are connected via the bus 502 .

[0103] The memory 500 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 503 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used. The bus 502 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0104] The processor 501 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 501. The above processor 501 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present invention can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module may be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 500, and the processor 501 reads the information in the memory 500 and completes the steps of the method of the above embodiment in combination with its hardware.

[0105] An embodiment of the present invention also provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions prompt the processor to implement the above-mentioned control method for the electric power steering oil pump applied to new energy vehicles. The specific implementation can be found in the method embodiment, which will not be repeated here.

[0106] The computer program product for the control method of the electric power steering oil pump applied to new energy vehicles provided in the embodiment of the present invention includes a computer-readable storage medium storing non-volatile program code executable by a processor. The instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can be found in the method embodiment, which will not be repeated here.

[0107] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0108] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0109] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0110] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0111] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that can be executed by a processor. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., various media that can store program codes.

[0112] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A control method for an electric power steering oil pump applied to a new energy vehicle, characterized in that: The method comprises: Determine the road mode and gear status of the new energy vehicle; If the road mode is a non-snow mode and the gear state is a forward gear, determining the current road condition of the new energy vehicle based on a pre-acquired steering wheel steering torque signal, a steering wheel angle signal, a gyroscope signal, and a wheel adhesion coefficient sensor signal; Determining a rotation speed of a steering oil pump based on the current road condition and the current speed of the new energy vehicle; An oil pump speed signal is sent to the steering oil pump based on the speed to control the operation of the steering oil pump.

2. The method according to claim 1, characterized in that: The method of determining the current road condition of the new energy vehicle based on the pre-acquired steering wheel steering torque signal, steering wheel angle signal, gyroscope signal, and wheel adhesion coefficient sensor signal includes: determining a driving direction adjustment intention of the new energy vehicle based on the steering wheel steering torque signal and the steering wheel angle signal; Determining a driving road condition of the new energy vehicle based on the gyroscope signal and the wheel adhesion coefficient sensor signal; The current road condition of the new energy vehicle is determined based on the driving direction adjustment intention and the driving road condition.

3. The method according to claim 2, characterized in that The determining the driving direction adjustment intention of the new energy vehicle based on the steering wheel steering torque signal and the steering wheel angle signal includes: If the steering wheel steering torque signal is less than or equal to a preset steering torque threshold, and the steering wheel angle signal is less than or equal to a preset angle threshold, then the driving direction adjustment intention means that the new energy vehicle has no intention to adjust the driving direction; If the steering wheel steering torque signal is greater than a preset steering torque threshold, and the steering wheel angle signal is greater than a preset angle threshold, then the driving direction adjustment intention means that the new energy vehicle has an intention to adjust the driving direction.

4. The method according to claim 3, characterized in that The steering torque threshold is 5 Nm, and the steering angle threshold is 3°.

5. The method according to claim 3, characterized in that: The determining of the driving road condition of the new energy vehicle based on the gyroscope signal and the wheel adhesion coefficient sensor signal includes: Comparing the coefficient represented by the wheel adhesion coefficient sensor signal with a preset coefficient threshold to obtain a comparison result; Determine, based on the gyroscope signal, a position change of a first center of mass position of the current new energy vehicle relative to a second center of mass position before the new energy vehicle is started; The driving road condition of the new energy vehicle is determined based on the comparison result and the position change.

6. The method according to claim 5, characterized in that The determining the driving road condition of the new energy vehicle based on the comparison result and the position change includes: If the comparison result is that the coefficient is greater than or equal to the coefficient threshold, and the first center of mass position is not offset by a preset value relative to the second center of mass position, then the driving road condition is a flat road; If the comparison result is that the coefficient is not equal to the coefficient threshold, and the first center of mass position is offset by the preset value relative to the second center of mass position, then the driving road condition is a slope road.

7. The method according to claim 6, characterized in that The method further comprises: If the coefficient is less than the coefficient threshold, and the first center of mass position is offset by the preset value relative to the second center of mass position and is offset backward, then the driving road condition is an uphill road on a slope road; If the coefficient is greater than the coefficient threshold, and the first center of mass position is offset by the preset value relative to the second center of mass position and is offset forward, the driving road condition is a downhill road on a slope road.

8. The method according to claim 7, characterized in that The determining the current road condition of the new energy vehicle based on the driving direction adjustment intention and the driving road condition includes: If the driving direction adjustment intention is that the new energy vehicle has no intention to adjust the driving direction, and the driving road condition is a flat road, then the current road condition is a straight road condition; If the driving direction adjustment intention is that the new energy vehicle has no intention to adjust the driving direction, and the driving road condition is an uphill road on a slope road, then the current road condition is a continuous climbing condition; If the driving direction adjustment intention is that the new energy vehicle has no intention to adjust the driving direction, and the driving road condition is a downhill road on a slope road, then the current road condition is a continuous downhill condition; If the driving direction adjustment intention is that the new energy vehicle continues to have the intention to adjust the driving direction, and the driving road condition is a flat road, then the current road condition is a continuous multi-bend condition; If the driving direction adjustment intention is that the new energy vehicle continues to have the intention to adjust the driving direction, and the driving road condition is an uphill road on a slope road, then the current road condition is a continuous climbing multi-bend condition; If the driving direction adjustment intention is that the new energy vehicle continues to have the intention to adjust the driving direction, and the driving road condition is a downhill road on a slope road, then the current road condition is a continuous downhill multi-curve condition.

9. The method according to claim 8, characterized in that The determining the rotation speed of the steering oil pump based on the current road condition and the current speed of the new energy vehicle includes: When the current vehicle speed of the new energy vehicle is within a preset first speed range, if the current road condition is one of the straight road condition, the continuous climbing condition, and the continuous climbing multi-bend condition, determining the rotation speed of the steering oil pump to be the first rotation speed; If the current road condition is one of the continuous downhill condition, the continuous multi-bend condition and the continuous downhill multi-bend condition, determining the rotation speed of the steering oil pump to be the second rotation speed; When the current vehicle speed of the new energy vehicle is within a preset second speed range, if the current road condition is one of the straight road condition, the continuous climbing condition, the continuous downhill condition, the continuous climbing multi-bend condition, and the continuous downhill multi-bend condition, it is determined that the speed of the steering oil pump is within the first speed range; If the current road condition is the continuous multi-bend condition, determining that the rotation speed of the steering oil pump is within a second rotation speed range; When the current vehicle speed of the new energy vehicle is within a preset third speed range, if the current road condition is one of the straight road condition, the continuous climbing condition, the continuous downhill condition, the continuous climbing multi-bend condition, and the continuous downhill multi-bend condition, then the speed of the steering oil pump is determined to be the third speed; If the current road condition is the continuous multi-bend condition, the rotation speed of the steering oil pump is determined to be the fourth rotation speed.

10. The method according to claim 9, characterized in that The first speed range is 0-25 km / h, the second speed range is 25-55 km / h, the third speed range is 55-89 km / h, the first speed is 1100 r / min, the second speed is 1150 r / min, the third speed is 900 r / min, the fourth speed is 950 r / min, the first speed range is 900-1100 r / min, and the second speed range is 950-1100 r / min.

11. The method according to claim 1, characterized in that After determining the rotation speed of the steering oil pump, the method further includes: determining whether the steering oil pump has an abnormal temperature based on a pre-acquired oil pump temperature signal of the steering oil pump; If there is no temperature abnormality, an oil pump speed signal is sent to the steering oil pump based on the speed to control the operation of the steering oil pump.

12. The method according to claim 1, characterized in that The method further includes: if the road mode is a non-snow mode and the gear state is a reverse gear, sending a rated speed operation signal to the steering oil pump to control the operation of the steering oil pump.

13. The method according to claim 1, characterized in that The method further includes: if the road mode is a snow mode, sending an idle operation signal to the steering oil pump to control the operation of the steering oil pump.

14. A control device for an electric power steering oil pump used in a new energy vehicle, characterized in that: The device comprises: A mode and state determination module, used to determine the road mode and gear state of the new energy vehicle; a current road condition determination module, configured to determine the current road condition of the new energy vehicle based on a pre-acquired steering wheel steering torque signal, a steering wheel angle signal, a gyroscope signal, and a wheel adhesion coefficient sensor signal if the road mode is a non-snow mode and the gear state is a forward gear; A speed determination module, used to determine the speed of the steering oil pump based on the current road condition and the current speed of the new energy vehicle; The steering oil pump control module sends an oil pump speed signal to the steering oil pump based on the speed to control the operation of the steering oil pump.

15. An electronic device, characterized in that: It includes a processor and a memory, the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement the control method of the electric power steering oil pump applied to new energy vehicles as described in any one of claims 1 to 13.

16. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions. When the computer-executable instructions are called and executed by the processor, the computer-executable instructions prompt the processor to implement the control method of the electric power steering oil pump applied to new energy vehicles as described in any one of claims 1 to 13.

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