New energy automobile sliding energy recovery control method and system and working method of new energy automobile sliding energy recovery control system

Abstract

The invention discloses a new energy automobile sliding energy recovery control method and system and a working method of the new energy automobile sliding energy recovery control method and system. The control method comprises the steps that (1) the current speed value of a whole automobile and the opening value of an accelerator pedal are obtained; and 2) determining a strategy for recovering the sliding energy based on the current speed value of the whole vehicle and the opening value of the accelerator pedal. According to the method, the current speed value of the whole vehicle and the opening value of the accelerator pedal are detected, and different energy recovery schemes are executed according to the detection conditions, so that the problems that the current new energy vehicle is short in endurance mileage and the vehicle is paused during sliding recovery during accelerated driving are effectively solved; and the energy recovery efficiency and the whole vehicle cruising ability of the new energy vehicle are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a new energy vehicle coasting energy recovery control method, a control system and a working method thereof. Background Art

[0002] With the development of environmental protection activities such as "low-carbon travel", "energy conservation and emission reduction", and "green travel", and the implementation of the four-stage fuel consumption standard, carbon emissions have become a common concern in the automotive industry. In order to seek a more environmentally friendly way of travel, new energy vehicles have been vigorously promoted and gradually accepted by the market. As a major trend in the development of the global automobile industry, new energy vehicles, especially pure electric vehicles, have always been the focus of users in terms of driving range.

[0003] Today's new energy vehicles, including pure electric, hybrid, and hydrogen fuel cell vehicles, generally have energy recovery module designs. The current energy recovery methods of new energy vehicles are mainly coasting energy recovery and braking energy recovery. The braking method is quite different from that of transmission fuel vehicles, and when recovering energy, the driver cannot linearly control the size of the coasting energy recovery, which can easily make it difficult for drivers who are new to new energy vehicles to adapt. At the same time, there are problems such as low energy recovery during braking and low recovery efficiency. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a new energy vehicle coasting energy recovery control method, a control system and a working method thereof that can maximize energy recovery and improve energy recovery efficiency.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A new energy vehicle coasting energy recovery control method comprises the following steps: Step 1) Obtain the current vehicle speed value and accelerator pedal opening value; Step 2) Determine the coasting energy recovery strategy based on the current vehicle speed value and the accelerator pedal opening value.

[0006] Preferably, step 2) includes the following steps: Step 2.1) Calculate the theoretical accelerator pedal opening value according to the current vehicle speed value; Step 2.2) Compare the theoretical accelerator pedal opening value with the current accelerator pedal opening value to obtain the output torque required by the driver.

[0007] Preferably, in step 2.2), When the current accelerator pedal opening value is greater than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, the vehicle outputs driving torque; When the current accelerator pedal opening value is less than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, and the difference between the two is less than the preset value, the vehicle does not output driving torque; When the current accelerator pedal opening value is less than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, and the difference between the two is greater than or equal to a preset value, the vehicle performs coasting energy recovery.

[0008] Preferably, step 1) further includes: obtaining the current angular acceleration of the accelerator pedal; Step 2) also includes: determining whether the current angular acceleration of the accelerator pedal is greater than a preset angular acceleration, and when the current angular acceleration of the accelerator pedal is greater than the preset angular acceleration, the whole vehicle outputs a driving torque.

[0009] Preferably, the current driving gear position of the vehicle is obtained, and when the driving gear position of the vehicle is the forward gear position, step 1) is executed.

[0010] Preferably, when the driving gear of the vehicle is the forward gear and the accelerator is released during the driving of the vehicle, it is determined whether the vehicle is in an emergency braking condition. If so, the vehicle does not output torque, otherwise, step 1) is executed.

[0011] A control system for realizing the above-mentioned new energy vehicle coasting energy recovery control method, comprising an accelerator pedal, a vehicle speed sensor, a vehicle controller, a motor controller, a drive motor and a power battery; The accelerator pedal is provided with an angular displacement sensor, which is in communication connection with the vehicle controller and is used to obtain the current opening value of the accelerator pedal of the vehicle and send it to the vehicle controller; The vehicle speed sensor is connected to the vehicle controller for obtaining the current vehicle speed value and sending it to the vehicle controller; The vehicle controller is in communication with the motor controller, and is used to send a control signal to the motor controller according to the current speed value of the vehicle and the opening value of the accelerator pedal, and receive a feedback signal from the motor controller; The motor controller is communicatively connected with the drive motor and the power battery, and is used to switch the working mode of the drive motor according to the control signal of the vehicle controller, and store the recovered energy in the power battery when the drive motor is in the power generation mode.

[0012] A working method of the control system as described above, wherein the angular displacement sensor and the vehicle speed sensor respectively send the current accelerator pedal opening value information and the vehicle speed value information of the whole vehicle to the whole vehicle controller, the whole vehicle controller decodes and analyzes the received current accelerator pedal opening value information and the vehicle speed value information, determines the output torque scheme after obtaining the results and sends the corresponding control signal to the motor controller, and the motor controller switches the working mode of the drive motor according to the control signal sent by the whole vehicle controller.

[0013] Preferably, after the angular displacement sensor detects the opening value information of the accelerator pedal, the opening value information of the accelerator pedal is sent to the vehicle controller, and the vehicle controller analyzes and decodes the opening value information of the accelerator pedal. If the decoded information shows that the opening value of the accelerator pedal is 0 or is decreasing, the vehicle controller obtains the vehicle speed value information of the vehicle speed sensor.

[0014] Preferably, when the current opening value of the accelerator pedal of the whole vehicle is less than the theoretical opening value of the accelerator pedal corresponding to the current speed value of the whole vehicle, and the difference between the two is greater than or equal to a preset value, the whole vehicle controller sends an instruction to execute the coasting energy recovery control to the motor controller, and the motor controller controls the drive motor to convert from a driving mode that provides driving force for the whole vehicle to a power generation mode that recovers energy. When the drive motor is in the power generation mode, the drive motor charges the power battery through the motor controller.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The present invention detects the current speed value of the whole vehicle and the opening value of the accelerator pedal, and executes different energy recovery schemes according to the detection results, thereby effectively solving the problems of short cruising range of current new energy vehicles and vehicle jerking during acceleration and coasting recovery, and improving the energy recovery efficiency and the whole vehicle cruising range of new energy vehicles.

[0016] 2. The present invention detects the current speed value of the whole vehicle and the opening value of the accelerator pedal to execute different energy recovery schemes. When the opening value of the accelerator pedal is greater than the theoretical opening value of the accelerator pedal corresponding to the current speed value of the whole vehicle, the whole vehicle outputs a driving torque. When the opening value of the accelerator pedal is less than the theoretical opening value of the accelerator pedal corresponding to the current speed value of the whole vehicle, and the difference between the two is less than a preset value, the whole vehicle does not output a driving torque; when the opening value of the accelerator pedal is less than the theoretical opening value of the accelerator pedal corresponding to the current speed value of the whole vehicle, and the difference between the two is greater than or equal to a preset value, the whole vehicle performs coasting energy recovery, and distributes appropriate recovery torque according to the speed value of the whole vehicle and the opening value of the accelerator pedal to improve the recovery power. According to the speed demand of the driver, the energy recovery is maximized and the energy recovery efficiency is improved through calculation of the speed value of the whole vehicle and the opening value of the accelerator pedal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 This is an overall flow chart of the coasting energy recovery control method for new energy vehicles of the present invention; Attached Figure 2 This is a specific flow chart of the new energy vehicle coasting energy recovery control method of the present invention; Attached Figure 3 It is a system block diagram of the control system of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0019] Today's new energy vehicles, including pure electric, hybrid, and hydrogen fuel cell vehicles, generally have energy recovery module designs. The current energy recovery methods of new energy vehicles are mainly coasting energy recovery and braking energy recovery. The braking method is quite different from that of transmission fuel vehicles, and when recovering energy, the driver cannot linearly control the size of the coasting energy recovery, which can easily make it difficult for drivers who have just bought new energy vehicles to adapt, and the recovered energy is small and the recovery efficiency is low.

[0020] In order to solve the above technical problems, a new energy vehicle coasting energy recovery control method is provided in this specific embodiment, as shown in the attached Figure 1 As shown, the following steps are included: Step 1) Obtain the current vehicle speed value and accelerator pedal opening value; Step 2) Determine the coasting energy recovery strategy based on the current vehicle speed value and the accelerator pedal opening value.

[0021] Step 2.1) Calculate the theoretical accelerator pedal opening value according to the current vehicle speed value; Step 2.2) Compare the theoretical accelerator pedal opening value with the current accelerator pedal opening value to obtain the output torque required by the driver.

[0022] As attached Figure 2 As shown, when the current accelerator pedal opening value is greater than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, the vehicle outputs driving torque; When the current accelerator pedal opening value is less than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, and the difference between the two is less than the preset value, the vehicle does not output driving torque; When the current accelerator pedal opening value is less than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, and the difference between the two is greater than or equal to a preset value, the vehicle performs coasting energy recovery.

[0023] In this specific embodiment, step 1) further includes: obtaining the current angular acceleration of the accelerator pedal; Step 2) also includes: determining whether the current angular acceleration of the accelerator pedal is greater than a preset angular acceleration, and when the current angular acceleration of the accelerator pedal is greater than the preset angular acceleration, the whole vehicle outputs a driving torque.

[0024] In this specific embodiment, as shown in the attached Figure 2 As shown, before executing step 1), the current driving gear of the vehicle is obtained. When the driving gear of the vehicle is the forward gear and the accelerator is released during the driving of the vehicle, it is first determined whether the vehicle is in an emergency braking condition. If it is an emergency braking condition, the vehicle does not output torque. Otherwise, step 1) is executed.

[0025] In addition, in this specific embodiment, a control system is also provided to implement the above-mentioned new energy vehicle coasting energy recovery control method, as shown in the attached Figure 3 As shown, it includes an accelerator pedal, a vehicle speed sensor, a vehicle controller, a shifter, a motor controller, an ESC system (body stability control system), a drive motor and a power battery.

[0026] An angular displacement sensor is provided on the accelerator pedal. The angular displacement sensor is connected to the vehicle controller for obtaining the current opening value of the accelerator pedal of the vehicle and sending it to the vehicle controller. The angular displacement sensor can detect the angle change information of the accelerator pedal. The angle change of the accelerator pedal represents the change in the opening value of the accelerator pedal, thereby changing the operating condition of the vehicle.

[0027] The vehicle speed sensor is connected to the vehicle controller for obtaining the current vehicle speed value and sending it to the vehicle controller.

[0028] The vehicle controller is communicatively connected with the motor controller, and is used to send a control signal to the motor controller according to the current speed value of the vehicle and the opening value of the accelerator pedal, and receive a feedback signal from the motor controller.

[0029] The motor controller is connected to the drive motor and the power battery in communication, and is used to switch the working mode of the drive motor according to the control signal of the vehicle controller, and store the recovered energy in the power battery when the drive motor is in the power generation mode, so as to recover the braking energy into the power battery for use. The working modes of the drive motor include a driving mode that provides driving force for the whole vehicle and a power generation mode that recovers energy. The motor controller switches the drive motor between the driving mode and the power generation mode according to the control signal sent by the vehicle controller.

[0030] The ESC system is connected to the vehicle controller for communication. When the ESC system is working and the vehicle is in emergency braking, the vehicle does not recover braking energy.

[0031] In this specific embodiment, a working method of the control system as mentioned above is also provided, the angular displacement sensor and the vehicle speed sensor respectively send the current accelerator pedal opening value information and the speed value information of the whole vehicle to the whole vehicle controller, the whole vehicle controller decodes and analyzes the received current accelerator pedal opening value information and the speed value information of the whole vehicle, and after obtaining the results, determines the output torque scheme and sends the corresponding control signal to the motor controller, and the motor controller switches the working mode of the drive motor according to the control signal sent by the whole vehicle controller.

[0032] Specifically, the opening value of the accelerator pedal is a prerequisite for determining whether the vehicle is performing energy recovery. After the angular displacement sensor detects the opening value information of the accelerator pedal, it sends the opening value information of the accelerator pedal to the vehicle controller, which analyzes and decodes the opening value information of the accelerator pedal. If the decoded information shows that the opening value of the accelerator pedal is 0 or is decreasing, the vehicle controller obtains the vehicle speed value information of the vehicle speed sensor.

[0033] When the current accelerator pedal opening value is greater than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, the vehicle controller sends a control instruction to the motor controller, and the motor controller controls the drive motor to provide driving force for the vehicle, and the vehicle outputs driving torque.

[0034] When the current accelerator pedal opening value is less than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, and the difference between the two is less than the preset value, the vehicle controller sends a control instruction to the motor controller, and the motor controller controls the drive motor not to output drive torque. At this time, the vehicle also does not output drive torque.

[0035] When the current accelerator pedal opening value is less than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, and the difference between the two is greater than or equal to the preset value, the vehicle controller sends an instruction to execute coasting energy recovery control to the motor controller. The motor controller controls the drive motor to convert from a driving mode that provides driving force for the vehicle to a power generation mode that recovers energy. When the drive motor is in the power generation mode, the drive motor charges the power battery through the motor controller.

[0036] During this stage, it is necessary to allocate the recovery torque according to the real-time speed value and the accelerator pedal opening value φ, and pre-store the recovery torque according to different vehicle speed values ​​and different accelerator pedal opening values ​​φ in the vehicle controller. After the vehicle controller obtains the current speed value and the accelerator pedal opening value φ of the vehicle, it will look up the table according to the MAP diagram to obtain the recovery torque that can maximize energy recovery corresponding to the current vehicle working condition, and send the recovery torque to the motor controller. After receiving the recovery torque, the motor controller controls the drive motor to switch from the drive mode to the power generation mode according to the value of the recovery torque. After that, the drive motor stores the recovered energy in the power battery through the motor controller to complete the energy recovery, ensure the most efficient energy recovery efficiency, and improve the endurance of the vehicle.

[0037] During the driving of the vehicle, when encountering an emergency, the driver will brake suddenly out of instinct, causing the wheels to lock, which in turn causes the vehicle to skid and the driver to lose control of the vehicle. In order to avoid this situation, an ESC system, namely the body stability control system, is added to the vehicle. When the ESC system is triggered, it indicates that the vehicle needs to perform emergency braking. At this time, if the drive motor braking is added for energy recovery, the braking effect of the vehicle will be weakened, which is easy to cause a safety accident. Therefore, when the ESC car 1 is triggered, the vehicle only performs mechanical braking.

[0038] Compared with the prior art, the present invention has the following advantages: the present invention detects the current speed value of the whole vehicle and the opening value of the accelerator pedal, and executes different energy recovery schemes according to the detection conditions, thereby effectively solving the problems of short cruising range of current new energy vehicles and vehicle setbacks during acceleration and coasting recovery, and improving the energy recovery efficiency and the whole vehicle cruising capacity of new energy vehicles. The present invention detects the current speed value of the whole vehicle and the opening value of the accelerator pedal to execute different energy recovery schemes. When the accelerator pedal opening value is greater than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, the vehicle outputs driving torque; when the accelerator pedal opening value is less than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, and the difference between the two is less than the preset value, the vehicle does not output driving torque; when the accelerator pedal opening value is less than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, and the difference between the two is greater than or equal to the preset value, the vehicle performs coasting energy recovery, and allocates appropriate recovery torque according to the vehicle speed value and the accelerator pedal opening value to increase the recovery power; according to the driver's speed requirement, the vehicle speed value and the accelerator pedal opening value are calculated to ensure maximum energy recovery and improve energy recovery efficiency.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A new energy vehicle coasting energy recovery control method, characterized in that: The following steps are involved: Step 1) Obtain the current vehicle speed value and accelerator pedal opening value; Step 2) Determine the coasting energy recovery strategy based on the current vehicle speed value and the accelerator pedal opening value.

2. The new energy vehicle coasting energy recovery control method according to claim 1, characterized in that: Step 2) includes the following steps: Step 2.1) Calculate the theoretical accelerator pedal opening value according to the current vehicle speed value; Step 2.2) Compare the theoretical accelerator pedal opening value with the current accelerator pedal opening value to obtain the output torque required by the driver.

3. The new energy vehicle coasting energy recovery control method according to claim 2 is characterized in that: In step 2.2), When the current accelerator pedal opening value is greater than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, the vehicle outputs driving torque; When the current accelerator pedal opening value is less than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, and the difference between the two is less than the preset value, the vehicle does not output driving torque; When the current accelerator pedal opening value is less than the theoretical accelerator pedal opening value corresponding to the current vehicle speed value, and the difference between the two is greater than or equal to a preset value, the vehicle performs coasting energy recovery.

4. The new energy vehicle coasting energy recovery control method according to claim 3 is characterized in that: Step 1) also includes: obtaining the current angular acceleration of the accelerator pedal; Step 2) also includes: determining whether the current angular acceleration of the accelerator pedal is greater than a preset angular acceleration, and when the current angular acceleration of the accelerator pedal is greater than the preset angular acceleration, the whole vehicle outputs a driving torque.

5. The new energy vehicle coasting energy recovery control method according to claim 4 is characterized in that: The current driving gear position of the vehicle is obtained, and when the driving gear position of the vehicle is the forward gear position, step 1) is executed.

6. The new energy vehicle coasting energy recovery control method according to claim 5 is characterized in that: When the driving gear of the vehicle is the forward gear and the accelerator is released during the driving of the vehicle, it is determined whether the vehicle is in an emergency braking condition. If so, the vehicle does not output torque. Otherwise, step 1 is executed.

7. A control system for implementing the new energy vehicle coasting energy recovery control method as claimed in claim 1, characterized in that: Including accelerator pedal, vehicle speed sensor, vehicle controller, motor controller, drive motor and power battery; The accelerator pedal is provided with an angular displacement sensor, which is in communication connection with the vehicle controller and is used to obtain the current opening value of the accelerator pedal of the vehicle and send it to the vehicle controller; The vehicle speed sensor is connected to the vehicle controller for obtaining the current vehicle speed value and sending it to the vehicle controller; The vehicle controller is in communication with the motor controller, and is used to send a control signal to the motor controller according to the current speed value of the vehicle and the opening value of the accelerator pedal, and receive a feedback signal from the motor controller; The motor controller is communicatively connected with the drive motor and the power battery, and is used to switch the working mode of the drive motor according to the control signal of the vehicle controller, and store the recovered energy in the power battery when the drive motor is in the power generation mode.

8. A method for operating a control system according to claim 7, characterized in that: The angular displacement sensor and the vehicle speed sensor respectively send the current accelerator pedal opening value information and the vehicle speed value information of the whole vehicle to the whole vehicle controller. The whole vehicle controller decodes and analyzes the received current accelerator pedal opening value information and the vehicle speed value information. After obtaining the results, it determines the output torque scheme and sends the corresponding control signal to the motor controller. The motor controller switches the working mode of the drive motor according to the control signal sent by the whole vehicle controller.

9. The operating method of the control system according to claim 8, characterized in that: After the angular displacement sensor detects the opening value information of the accelerator pedal, the opening value information of the accelerator pedal is sent to the vehicle controller. The vehicle controller analyzes and decodes the opening value information of the accelerator pedal. If the decoded information shows that the opening value of the accelerator pedal is 0 or is decreasing, the vehicle controller obtains the vehicle speed value information of the vehicle speed sensor.

10. The operating method of the control system according to claim 9, characterized in that: When the current opening value of the accelerator pedal of the whole vehicle is less than the theoretical opening value of the accelerator pedal corresponding to the current speed value of the whole vehicle, and the difference between the two is greater than or equal to the preset value, the whole vehicle controller sends an instruction to execute the coasting energy recovery control to the motor controller, and the motor controller controls the drive motor to convert from a driving mode for providing driving force for the whole vehicle to a power generation mode for recovering energy. When the drive motor is in the power generation mode, the drive motor charges the power battery through the motor controller.

Images