Electric automobile energy recovery torque control method and device, automobile and medium

Abstract

The invention relates to the technical field of vehicles, in particular to an electric automobile energy recovery torque control method and device, an automobile, a medium and a product.The method comprises the steps that whether an accelerator pedal of the electric automobile is stepped down or not under the downhill working condition is detected; if the accelerator pedal is not stepped down, the current acceleration of the electric vehicle is obtained; and if the current acceleration is greater than the target acceleration, controlling the energy recovery torque of the electric vehicle according to the current acceleration and the target acceleration until the current acceleration is less than or equal to the target acceleration. Therefore, the problems that in the downhill driving process of the electric automobile, the experience feeling of a driver is poor, and potential risks in the driving process are large are solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an electric vehicle energy recovery torque control method, device, vehicle, medium and product. Background Art

[0002] The development of electric vehicles is experiencing rapid growth and continuous innovation. More and more automakers are investing in the research and development and production of electric vehicles, and electric vehicle technology is constantly improving. Generally speaking, when driving on flat roads, electric vehicles tend to have higher energy recovery torque than gasoline vehicles. When the driver reduces the degree of stepping on the accelerator pedal, the electric vehicle will adjust to a constant speed or even decelerate; when the driver completely releases the accelerator pedal, the vehicle will decelerate rapidly, which not only meets the driver's driving needs, but also greatly improves driving safety.

[0003] However, when an electric vehicle changes from a flat road to a downhill drive, especially on a downhill ramp in an underground parking garage, sometimes the driver wishes to slow down the vehicle after judging the road conditions. However, because they are still accustomed to driving on flat roads, they do not fully realize the potential acceleration risks of downhill driving and do not release the accelerator pedal in time, or the energy recovery intensity after the vehicle releases the accelerator pedal is smaller than the intensity of gravity acting on the downhill slope, and the acceleration of the electric vehicle still exists and is positive, causing the vehicle to continue to accelerate, which greatly exceeds the driver's psychological expectations, resulting in a poor driver experience and greater potential risks in the driving process. Summary of the invention

[0004] The present application provides an electric vehicle energy recovery torque control method, device, vehicle, medium and product to solve the problems of poor driver experience and high potential risks in the driving process during downhill driving of an electric vehicle.

[0005] The first aspect of the present application provides an electric vehicle energy recovery torque control method, comprising the following steps: detecting whether the accelerator pedal of the electric vehicle is pressed down in a downhill condition; if the accelerator pedal is not pressed down, obtaining the current acceleration of the electric vehicle; if the current acceleration is greater than the target acceleration, controlling the energy recovery torque of the electric vehicle according to the current acceleration and the target acceleration until the current acceleration is less than or equal to the target acceleration.

[0006] Optionally, in an embodiment of the present application, the energy recovery torque of the electric vehicle is controlled according to the current acceleration and the target acceleration, including: calculating the acceleration closing control torque according to the deviation between the current acceleration and the target acceleration; and controlling the energy recovery torque of the electric vehicle according to the acceleration closing control torque and the driver's required torque.

[0007] Optionally, in an embodiment of the present application, the energy recovery torque of the electric vehicle is controlled according to the acceleration closing control torque and the driver's required torque, including: if the acceleration closing control torque is less than the required torque, the energy recovery torque of the electric vehicle is controlled according to the acceleration closing control torque; if the acceleration closing control torque is greater than or equal to the required torque, the energy recovery torque of the electric vehicle is controlled according to the required torque.

[0008] Optionally, in an embodiment of the present application, detecting whether the accelerator pedal of the electric vehicle is pressed down in a downhill condition includes: obtaining the current opening of the accelerator pedal of the electric vehicle in a downhill condition; if the current opening of the accelerator pedal is less than or equal to a preset opening, the accelerator pedal is not pressed down; if the current opening of the accelerator pedal is greater than the preset opening, the accelerator pedal is pressed down.

[0009] Optionally, in an embodiment of the present application, the downhill condition refers to a road condition where the slope of the road on which the electric vehicle is currently located is greater than a preset slope.

[0010] Optionally, in an embodiment of the present application, before controlling the energy recovery torque of the electric vehicle according to the current acceleration and the target acceleration, it also includes: obtaining the motor state, battery state and vehicle state of the electric vehicle; and correcting the energy recovery torque according to at least one of the motor state, battery state and vehicle state.

[0011] The second aspect of the present application provides an electric vehicle energy recovery torque control device, including: a detection module, used to detect whether the accelerator pedal of the electric vehicle is pressed down under downhill conditions; an acquisition module, used to obtain the current acceleration of the electric vehicle if the accelerator pedal is not pressed down; a control module, used to control the energy recovery torque of the electric vehicle according to the current acceleration and the target acceleration if the current acceleration is greater than the target acceleration, until the current acceleration is less than or equal to the target acceleration.

[0012] Optionally, in an embodiment of the present application, the control module is further used to: calculate the acceleration closing control torque according to the deviation between the current acceleration and the target acceleration; and control the energy recovery torque of the electric vehicle according to the acceleration closing control torque and the driver's required torque.

[0013] Optionally, in an embodiment of the present application, the control module is further used to: if the acceleration closing control torque is less than the required torque, control the energy recovery torque of the electric vehicle according to the acceleration closing control torque; if the acceleration closing control torque is greater than or equal to the required torque, control the energy recovery torque of the electric vehicle according to the required torque.

[0014] Optionally, in an embodiment of the present application, the detection module is further used to: obtain the current opening of the accelerator pedal of the electric vehicle under downhill conditions; if the current opening of the accelerator pedal is less than or equal to a preset opening, the accelerator pedal is not pressed; if the current opening of the accelerator pedal is greater than the preset opening, the accelerator pedal is pressed.

[0015] Optionally, in an embodiment of the present application, the downhill condition refers to a road condition where the slope of the road on which the electric vehicle is currently located is greater than a preset slope.

[0016] Optionally, in an embodiment of the present application, it also includes: a correction module for obtaining the motor state, battery state and vehicle state of the electric vehicle before controlling the energy recovery torque of the electric vehicle according to the current acceleration and the target acceleration; and correcting the energy recovery torque according to at least one of the motor state, battery state and vehicle state.

[0017] A third aspect of the present application provides an electric vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement an electric vehicle energy recovery torque control method as described in the above embodiment.

[0018] The fourth aspect of the present application provides a computer-readable storage medium on which a computer program / instruction is stored. When the computer program / instruction is executed by a processor, an electric vehicle energy recovery torque control method as described in the above embodiment is implemented.

[0019] The fifth aspect of the present application provides a computer program product, including a computer program or instructions, which, when executed by a processor, implements the electric vehicle energy recovery torque control method as described in the above embodiment.

[0020] Therefore, this application includes the following beneficial effects:

[0021] The embodiment of the present application can realize that when the electric vehicle is in a downhill condition, the acceleration closing control torque is calculated according to the current acceleration and the target acceleration, and combined with the driver's required torque, the energy recovery torque of the electric vehicle is controlled until the current acceleration is less than or equal to the preset target acceleration, ensuring that the vehicle does not exceed the target acceleration during the entire downhill process, so that the acceleration of the electric vehicle can be controlled within a certain range when the electric vehicle is going downhill, reducing the potential risks caused by excessive acceleration, improving the safety of the electric vehicle when going downhill, and at the same time avoiding the acceleration exceeding the driver's psychological expectations, effectively improving the driver's driving experience when going downhill. Therefore, the technical problems such as poor driver experience and high potential risks in the driving process during downhill driving of electric vehicles are solved.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 A flow chart of an electric vehicle energy recovery torque control method provided according to an embodiment of the present application;

[0025] Figure 2 A flowchart of an electric vehicle energy recovery torque control method provided according to an embodiment of the present application;

[0026] Figure 3 This is an example diagram of an energy recovery torque control device for an electric vehicle according to an embodiment of the present application;

[0027] Figure 4 It is a schematic diagram of the structure of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0029] The following describes the electric vehicle energy recovery torque control method, device, vehicle and storage medium of the embodiment of the present application with reference to the accompanying drawings. In view of the problems mentioned in the above background technology that the driver experience is not good during the downhill driving of the electric vehicle and the potential risks of the driving process are relatively high, the present application provides an electric vehicle energy recovery torque control method. In this method, it is necessary to detect whether the accelerator pedal of the electric vehicle is pressed down under downhill conditions. When the accelerator pedal is not pressed down, the current acceleration of the electric vehicle is obtained and compared with the target acceleration. If the current acceleration is greater than the target acceleration, the energy recovery torque of the electric vehicle is controlled according to the current acceleration and the target acceleration until the current acceleration is less than or equal to the target acceleration. In this way, the problems of poor driver experience and high potential risks in the driving process of the electric vehicle during downhill driving are solved.

[0030] Specifically, Figure 1 A flow chart of a method for controlling energy recovery torque of an electric vehicle provided in an embodiment of the present application.

[0031] like Figure 1As shown, the electric vehicle energy recovery torque control method includes the following steps:

[0032] In step S101, it is detected whether the accelerator pedal of the electric vehicle is depressed in a downhill condition.

[0033] Among them, the downhill condition is a road condition where the slope of the current road surface of the electric vehicle is greater than the preset slope. The current road surface slope can be obtained by the on-board sensor and navigation system of the electric vehicle. The embodiment of the present application presets a slope calibration value, compares the detected current road surface slope value with the preset slope value, and if the current slope value is greater than the preset slope value, it is determined that the current condition is a downhill condition, and if the current slope value is less than or equal to the preset slope value, it is determined that the current condition is not a downhill condition. For example, if the preset slope is 0 degrees, and the current road surface slope value is detected to be 5 degrees, then the current road surface slope value is greater than the preset slope value, and it is determined that the current condition is a downhill condition.

[0034] Among them, a position sensor is installed on the accelerator pedal, which generates a signal according to the position where the driver steps on the pedal and outputs it to the vehicle control unit, ultimately adjusting the output torque of the drive motor, thereby affecting the acceleration and deceleration of the vehicle.

[0035] It can be understood that the embodiment of the present application needs to detect whether the accelerator pedal of the electric vehicle is pressed in a downhill condition, so as to identify the driver's driving demand in the downhill condition as acceleration, deceleration or constant speed, so as to provide technical solutions according to the needs, avoid entering the subsequent energy recovery torque control process when the driver needs to accelerate, and improve the applicability of the energy recovery torque control method of the electric vehicle.

[0036] In an embodiment of the present application, detecting whether the accelerator pedal of an electric vehicle is pressed down in a downhill condition includes: obtaining the current opening of the accelerator pedal of the electric vehicle in a downhill condition; if the current opening of the accelerator pedal is less than or equal to a preset opening, the accelerator pedal is not pressed down; if the current opening of the accelerator pedal is greater than the preset opening, the accelerator pedal is pressed down.

[0037] The accelerator pedal opening refers to the degree to which the driver presses the accelerator pedal or the position at which the pedal is pressed. The preset opening is a calibration value set based on experience, and the preset opening of the accelerator pedal can be set to 0.

[0038] It is understandable that the embodiment of the present application can identify whether the accelerator pedal is pressed by obtaining the current opening of the accelerator pedal of the electric vehicle under downhill conditions and comparing it with the preset opening. For example, taking the preset opening as 0 as an example, if the current opening is 0, it is determined that the accelerator pedal is not pressed, that is, the driver has released the accelerator pedal, otherwise it is determined that the accelerator pedal is pressed and the driver has an acceleration demand.

[0039] In step S102, if the accelerator pedal is not depressed, the current acceleration of the electric vehicle is obtained.

[0040] The vehicle acceleration is the change in vehicle speed at a fixed time interval. A positive change indicates that the vehicle is accelerating, and a negative change indicates that the vehicle is decelerating.

[0041] Specifically, the collected information may include brake pedal signals, MCU (Motor Control Unit), information uploaded by BMS (Battery Management System), etc. It should be noted that VCU is an electronic control module responsible for managing and controlling various functions and systems of the vehicle. The motor controller MCU is responsible for monitoring the working status of the motor and related systems, and controlling operations such as starting, accelerating, decelerating and stopping the motor. BMS is used to manage and monitor the vehicle's high-voltage power battery, and to monitor and control parameters such as the battery status, temperature, voltage and current in real time.

[0042] In step S103 , if the current acceleration is greater than the target acceleration, the energy recovery torque of the electric vehicle is controlled according to the current acceleration and the target acceleration until the current acceleration is less than or equal to the target acceleration.

[0043] Among them, the target acceleration can be pre-calibrated according to actual needs, that is, the value that the downhill acceleration requirement does not exceed is set as the target acceleration, thereby ensuring that the electric vehicle travels as required in the downhill condition. For example, if the target acceleration is set to 0.5km / h2, the embodiment of the present application can achieve the acceleration of no more than 0.5km / h2 in the downhill condition.

[0044] Specifically, the embodiment of the present application takes the actual vehicle going downhill without acceleration as an example, so the target acceleration in the embodiment of the present application is set to 0 or a negative value close to 0. Energy recovery torque refers to the torque generated in the process of converting the kinetic energy of the vehicle into electrical energy by using the reverse braking of the motor.

[0045] It can be understood that the embodiments of the present application need to determine the relationship between the current acceleration and the target acceleration, and thereby control the energy recovery torque of the electric vehicle, so as to achieve a target acceleration in which the current acceleration is less than or equal to a negative value of 0 or close to 0, thereby ensuring that the vehicle does not accelerate during downhill conditions, improving the driver experience, and enhancing vehicle safety.

[0046] For example, if the current acceleration of the electric vehicle is 5km / h2, which is greater than the target acceleration of 0km / h2, the energy recovery torque of the electric vehicle needs to be increased to improve the braking effect so that the final current acceleration is less than or equal to the target acceleration of 0km / h2.

[0047] In an embodiment of the present application, the energy recovery torque of the electric vehicle is controlled according to the current acceleration and the target acceleration, including: calculating the acceleration closing control torque according to the deviation between the current acceleration and the target acceleration; and controlling the energy recovery torque of the electric vehicle according to the acceleration closing control torque and the driver's required torque.

[0048] Among them, the acceleration closing control torque is calculated according to the deviation between the current acceleration and the target acceleration, and the closed-loop torque control is performed using a PID (Proportional-Integral-Derivative) closed-loop controller. The input of the PID closed-loop controller is the deviation between the current acceleration and the target acceleration. The system outputs the acceleration closing control torque through the PID closed-loop controller to make the actual torque close to the expected value.

[0049] It can be understood that the embodiment of the present application can calculate the acceleration closing control torque, and control the energy recovery torque of the electric vehicle according to the acceleration closing control torque and the driver's required torque, so that the energy recovery torque can better meet the actual needs of the electric vehicle.

[0050] In an embodiment of the present application, the energy recovery torque of the electric vehicle is controlled according to the acceleration closing control torque and the driver's required torque, including: if the acceleration closing control torque is less than the required torque, the energy recovery torque of the electric vehicle is controlled according to the acceleration closing control torque; if the acceleration closing control torque is greater than or equal to the required torque, the energy recovery torque of the electric vehicle is controlled according to the required torque.

[0051] Among them, the driving torque is defined as a positive value, and the energy recovery torque is defined as a negative value. When the accelerator pedal is not pressed, the acceleration closing control torque and the driver's required torque are both negative values. The acceleration closing control torque is less than the required torque, that is, the absolute value of the acceleration closing control torque is greater than the required torque; the acceleration closing control torque is greater than or equal to the required torque, that is, the absolute value of the acceleration closing control torque is less than or equal to the required torque.

[0052] Specifically, if the calculated acceleration closing control torque is -150 N·m and the driver's required torque is -120 N·m, it is determined that the acceleration closing control torque is less than the required torque, and the energy recovery torque of the electric vehicle is controlled according to the acceleration closing control torque.

[0053] It can be understood that the embodiment of the present application determines the energy recovery torque of the electric vehicle by comparing the acceleration closing control torque and the driver's required torque, and selects the smaller torque, that is, the larger absolute value, as the energy recovery torque output. The output energy recovery torque comprehensively considers the need for acceleration not exceeding the target acceleration and the driver's driving needs, which not only improves the driver's driving experience but also improves the safety and reliability of the vehicle in downhill conditions.

[0054] In an embodiment of the present application, before controlling the energy recovery torque of the electric vehicle according to the current acceleration and the target acceleration, it also includes: obtaining the motor state, battery state and vehicle state of the electric vehicle; and correcting the energy recovery torque according to at least one of the motor state, battery state and vehicle state.

[0055] Among them, the motor status includes speed, temperature, torque, etc. If the motor is running at high speed and high temperature, the output torque tends to decrease. The battery status mainly includes power, charge and discharge power, etc. When the battery power is low, the motor may not be able to provide enough power, resulting in a decrease in torque output. When the battery temperature is too high or too low, its performance will also be affected, which in turn affects the torque output of the motor. The vehicle status includes but is not limited to the braking system status, vehicle speed and driving behavior. Driving behavior includes the depth and duration of the driver's pedaling.

[0056] It can be understood that in addition to controlling the energy recovery torque according to the acceleration closing control torque and the required torque, the embodiments of the present application also need to consider the motor state, battery state and vehicle state of the electric vehicle, and correct the energy recovery torque accordingly, so that the determination of the energy recovery torque is more comprehensive. Therefore, the scope of application of the embodiments of the present application is wider.

[0057] According to the electric vehicle energy recovery torque control method proposed in the embodiment of the present application, when the electric vehicle is in a downhill condition, the acceleration closing control torque can be calculated according to the current acceleration and the target acceleration, and the energy recovery torque of the electric vehicle can be controlled in combination with the driver's required torque until the current acceleration is less than or equal to the preset target acceleration, ensuring that the vehicle does not exceed the target acceleration during the entire downhill process. This allows the acceleration of the electric vehicle to be controlled within a certain range when going downhill, reducing potential risks caused by excessive acceleration, improving the safety of the electric vehicle when going downhill, and at the same time preventing the acceleration from exceeding the driver's psychological expectations, effectively improving the driver's driving experience when going downhill.

[0058] The following is a specific example to illustrate the electric vehicle energy recovery torque control method of the present application embodiment. Figure 2 As shown, the following steps are included:

[0059] Step S1: Determine whether the driver releases the accelerator pedal and calculate the actual acceleration of the vehicle.

[0060] Step S2: If the driver releases the pedal, PID closed-loop torque control is performed based on the deviation between the target acceleration and the actual acceleration of the vehicle.

[0061] It should be noted that the target acceleration set in the embodiment of the present application can be 0. By setting the target acceleration to 0 for PID closed-loop torque control, it is possible to ensure that the electric vehicle does not accelerate in downhill conditions, thereby improving the user experience and the safety of the electric vehicle going downhill.

[0062] Step S3: Determine whether the acceleration closed-loop control torque is less than the driver's required torque.

[0063] Step S4: if the acceleration closed-loop control torque is less than the driver's required torque, the energy recovery torque output is controlled by the acceleration closed-loop control torque; if the acceleration closed-loop control torque is greater than the driver's required torque, the energy recovery torque output is controlled by the driver's required torque.

[0064] Step S5: If the driver presses the accelerator pedal, the energy recovery torque closed-loop control function is exited, and the required torque is the throttle torque.

[0065] Next, the energy recovery torque control device for an electric vehicle proposed in accordance with an embodiment of the present application will be described with reference to the accompanying drawings.

[0066] Figure 3 It is a block diagram of an energy recovery torque control device for an electric vehicle according to an embodiment of the present application.

[0067] like Figure 3 As shown, the electric vehicle energy recovery torque control device 10 includes: a detection module 100 , an acquisition module 200 and a control module 300 .

[0068] Among them, the detection module 100 is used to detect whether the accelerator pedal of the electric vehicle is pressed down in a downhill condition; the acquisition module 200 is used to obtain the current acceleration of the electric vehicle if the accelerator pedal is not pressed down; the control module 300 is used to control the energy recovery torque of the electric vehicle according to the current acceleration and the target acceleration if the current acceleration is greater than the target acceleration until the current acceleration is less than or equal to the target acceleration.

[0069] In the embodiment of the present application, the control module 300 is further used to: calculate the acceleration closing control torque according to the deviation between the current acceleration and the target acceleration; and control the energy recovery torque of the electric vehicle according to the acceleration closing control torque and the driver's required torque.

[0070] In the embodiment of the present application, the control module 300 is further used to: if the acceleration closing control torque is less than the required torque, control the energy recovery torque of the electric vehicle according to the acceleration closing control torque; if the acceleration closing control torque is greater than or equal to the required torque, control the energy recovery torque of the electric vehicle according to the required torque.

[0071] In an embodiment of the present application, the detection module 100 is further used to: obtain the current opening of the accelerator pedal of the electric vehicle under downhill conditions; if the current opening of the accelerator pedal is less than or equal to the preset opening, the accelerator pedal is not pressed; if the current opening of the accelerator pedal is greater than the preset opening, the accelerator pedal is pressed.

[0072] In the embodiment of the present application, the downhill condition refers to a road condition where the slope of the road on which the electric vehicle is currently located is greater than a preset slope.

[0073] In the embodiment of the present application, the device 10 of the embodiment of the present application further includes: a correction module.

[0074] Among them, the correction module is used to obtain the motor state, battery state and vehicle state of the electric vehicle before controlling the energy recovery torque of the electric vehicle according to the current acceleration and the target acceleration; and correct the energy recovery torque according to at least one of the motor state, battery state and vehicle state.

[0075] It should be noted that the above explanation of the embodiment of the electric vehicle energy recovery torque control method is also applicable to the electric vehicle energy recovery torque control device of this embodiment, and will not be repeated here.

[0076] According to the electric vehicle energy recovery torque control device proposed in the embodiment of the present application, when the electric vehicle is in a downhill condition, the acceleration closing control torque can be calculated according to the current acceleration and the target acceleration, and the energy recovery torque of the electric vehicle can be controlled in combination with the driver's required torque until the current acceleration is less than or equal to the preset target acceleration, ensuring that the vehicle does not exceed the target acceleration during the entire downhill process. In this way, the acceleration of the electric vehicle can be controlled within a certain range when going downhill, reducing the potential risks caused by excessive acceleration, improving the safety of the electric vehicle when going downhill, and at the same time avoiding the acceleration exceeding the driver's psychological expectations, effectively improving the driver's driving experience when going downhill.

[0077] Figure 4 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0078] Memory 401 , processor 402 , and a computer program stored in the memory 401 and executable on the processor 402 .

[0079] When the processor 402 executes the program, the electric vehicle energy recovery torque control method provided in the above embodiment is implemented.

[0080] Furthermore, the vehicle also includes:

[0081] The communication interface 403 is used for communication between the memory 401 and the processor 402 .

[0082] The memory 401 is used to store computer programs that can be executed on the processor 402 .

[0083] The memory 401 may include a high-speed RAM (Random Access Memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

[0084] If the memory 401, the processor 402 and the communication interface 403 are implemented independently, the communication interface 403, the memory 401 and the processor 402 can be connected to each other through a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0085] Optionally, in a specific implementation, if the memory 401, the processor 402 and the communication interface 403 are integrated on a chip, the memory 401, the processor 402 and the communication interface 403 can communicate with each other through an internal interface.

[0086] The processor 402 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application.

[0087] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the above-mentioned electric vehicle energy recovery torque control method is implemented.

[0088] An embodiment of the present application also provides a computer program product, including a computer program or instructions, which, when executed by a processor, implements the electric vehicle energy recovery torque control method as described in the above embodiment.

[0089] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0090] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0091] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0092] It should be understood that the various parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, the steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0093] A person of ordinary skill in the art may understand that all or part of the steps of the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the above-mentioned program may be stored in a computer-readable storage medium. When the computer program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0094] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for controlling energy recovery torque of an electric vehicle, It is characterized in that The following steps are involved: Detect whether the accelerator pedal of an electric vehicle is pressed down in downhill conditions; If the accelerator pedal is not depressed, obtaining the current acceleration of the electric vehicle; If the current acceleration is greater than the target acceleration, the energy recovery torque of the electric vehicle is controlled according to the current acceleration and the target acceleration until the current acceleration is less than or equal to the target acceleration.

2. The electric vehicle energy recovery torque control method according to claim 1, It is characterized in that The controlling the energy recovery torque of the electric vehicle according to the current acceleration and the target acceleration comprises: Calculating an acceleration closing control torque according to a deviation between the current acceleration and the target acceleration; The electric vehicle energy recovery torque is controlled according to the acceleration closing control torque and the driver's required torque.

3. The electric vehicle energy recovery torque control method according to claim 2, It is characterized in that The step of controlling the energy recovery torque of the electric vehicle according to the acceleration closing control torque and the driver's required torque includes: If the acceleration closing control torque is less than the required torque, controlling the energy recovery torque of the electric vehicle according to the acceleration closing control torque; If the acceleration closing control torque is greater than or equal to the required torque, the energy recovery torque of the electric vehicle is controlled according to the required torque.

4. The electric vehicle energy recovery torque control method according to claim 1, It is characterized in that The method of detecting whether the accelerator pedal of the electric vehicle is depressed in a downhill condition includes: Obtain the current opening degree of the accelerator pedal of the electric vehicle under downhill conditions; If the current opening of the accelerator pedal is less than or equal to the preset opening, the accelerator pedal is not depressed; If the current opening of the accelerator pedal is greater than the preset opening, the accelerator pedal is depressed.

5. The electric vehicle energy recovery torque control method according to claim 1, It is characterized in that The downhill working condition refers to a road condition where the slope of the road surface on which the electric vehicle is currently located is greater than a preset slope.

6. The electric vehicle energy recovery torque control method according to claim 1, It is characterized in that Before controlling the energy recovery torque of the electric vehicle according to the current acceleration and the target acceleration, the method further includes: Obtaining the motor status, battery status and vehicle status of the electric vehicle; The energy recovery torque is corrected according to at least one of the motor state, the battery state, and the entire vehicle state.

7. An electric vehicle energy recovery torque control device, It is characterized in that include: A detection module, used to detect whether the accelerator pedal of the electric vehicle is pressed down in a downhill condition; an acquisition module, configured to acquire the current acceleration of the electric vehicle if the accelerator pedal is not depressed; A control module is used to control the energy recovery torque of the electric vehicle according to the current acceleration and the target acceleration if the current acceleration is greater than the target acceleration, until the current acceleration is less than or equal to the target acceleration.

8. An electric car, It is characterized in that include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the electric vehicle energy recovery torque control method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program or instructions stored thereon, It is characterized in that When the computer program or instruction is executed, the electric vehicle energy recovery torque control method according to any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer program or instructions, It is characterized in that When the computer program or instruction is executed, the electric vehicle energy recovery torque control method according to any one of claims 1 to 6 is implemented.

Images