A pure electric vehicle intelligent coasting energy recovery control method

Abstract

The application provides a kind of pure electric vehicle intelligent coasting energy recovery control method, comprising: the coasting energy recovery control system is interacted with intelligent driving system to obtain the speed and distance information of front vehicle or obstacle.Signal.According to the speed and distance information of front vehicle or obstacle, the distance and relative speed of the vehicle and the front vehicle or the front obstacle are calculated.When the relative speed is greater than the calibration limit value, it is determined that the vehicle is in free coasting state, and the coasting energy recovery torque is controlled to be 0.When the relative speed is less than the calibration limit value, the minimum coasting energy recovery torque is set to recover control.The application can more intelligently adjust the vehicle deceleration when coasting deceleration, achieve greater energy recovery, and improve the energy saving and intelligence of the vehicle.

Description

Technical Field

[0001] This invention relates to the field of energy recovery technology for pure electric vehicles, and in particular to a method for intelligent coasting energy recovery control of pure electric vehicles. Background Technology

[0002] Compared to traditional gasoline-powered vehicles, new energy vehicles have a simpler overall structure, shorter power transmission paths, and extremely high energy utilization. Furthermore, to further improve efficiency, electric vehicles often incorporate energy recovery systems. When an electric vehicle decelerates or brakes, the drive motor stops supplying current. Simultaneously, the vehicle's inertial kinetic energy drives the motor rotor to rotate, generating current in the conductors. This current is then stored in the battery pack via the motor controller and high-voltage power distribution system, achieving energy recovery during the vehicle's coasting process.

[0003] Existing coasting energy recovery control strategies are relatively simple. The vehicle control unit (VCU) determines whether the conditions for entering the coasting energy recovery mode are met based on factors such as accelerator pedal opening, brake pedal engagement, battery state of charge (SOC), and ABS activation status. Once the VCU determines that the conditions are met, it controls the motor's recovery torque according to the driver's manually set coasting energy recovery level. However, in different driving scenarios, users' needs for the coasting energy recovery level or their expected coasting deceleration will vary, and existing energy recovery control cannot intelligently adjust the coasting energy recovery level based on the driving scenario. Therefore, it is of great significance to find a way to intelligently control the energy recovery level in different driving scenarios to achieve greater energy recovery and make vehicles more energy-efficient. Summary of the Invention

[0004] This invention provides an intelligent coasting energy recovery control method for pure electric vehicles, which solves the problem that existing pure electric vehicles cannot intelligently adjust the energy recovery level based on the scenario during energy recovery. It can more intelligently adjust the vehicle deceleration during coasting, achieve a greater degree of energy recovery, and improve the vehicle's energy efficiency and intelligence.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for intelligent coasting energy recovery control of a pure electric vehicle includes:

[0007] The coasting energy recovery control system interacts with the intelligent driving system to obtain information on the speed and distance of vehicles or obstacles ahead.

[0008] The distance and relative speed between the vehicle and the vehicle in front or the obstacle ahead are calculated based on the speed and distance information of the vehicle or obstacle ahead.

[0009] When the relative vehicle speed is greater than the calibrated limit, the vehicle is determined to be in a free coasting state, and the coasting energy recovery torque is controlled to be 0.

[0010] When the relative vehicle speed is less than the calibrated limit, recovery control is performed according to the set minimum coasting energy recovery torque.

[0011] Preferred options also include:

[0012] The coasting energy recovery control system interacts with the navigation system to obtain information on road congestion ahead, the current scene, and road speed limits.

[0013] The distance between the vehicle and the congested road section is calculated based on the road congestion information ahead, and recovery control is carried out using a recovery strategy inversely proportional to the distance.

[0014] When the distance between the vehicle and the congested road section ahead is less than a set limit, recovery control is performed using the set maximum coasting energy recovery torque.

[0015] Preferred options also include:

[0016] The coasting energy recovery control system interacts with the vehicle chassis electronic control system to obtain the vehicle's steering angle information and dynamic stability control information.

[0017] The vehicle's driving scenario is determined based on the vehicle's steering angle information and dynamic stability control information. In the steering scenario, it is determined whether the steering angle of the vehicle's steering wheel is greater than the calibrated angle. If so, the coasting energy recovery torque remains unchanged.

[0018] Preferred options also include:

[0019] When the vehicle is going uphill, the recovery torque is gradually reduced as the slope increases, and the recovery torque is adjusted in real time based on the vehicle speed.

[0020] When the vehicle is on a downhill slope, the recovery torque gradually increases as the slope increases, and the recovery torque is adjusted in real time based on the vehicle speed.

[0021] Preferred options also include:

[0022] When the vehicle is in a special speed-limited scenario and the actual vehicle speed is higher than the speed limit requirement, the maximum coasting energy recovery torque is used for recovery control.

[0023] Preferred options also include:

[0024] The coasting energy recovery control system interacts with the human-machine interface (HMI) system, which is installed on the vehicle MP5 and allows manual and automatic options for coasting energy recovery level control to be set via the MP5's central control screen.

[0025] When the coasting energy recovery level control is in the manual option, the coasting energy recovery control system enters the manual recovery level control mode;

[0026] When the coasting energy recovery level control is set to the automatic option, the coasting energy recovery control system enters the automatic recovery level control mode.

[0027] Preferred options also include:

[0028] If the intelligent driving system is in a fault state, the coasting energy recovery control system will enter the manual recovery level control mode and disable the automatic recovery level control mode.

[0029] Preferred options also include:

[0030] If the vehicle is not equipped with a navigation system or the navigation system is malfunctioning, the coasting energy recovery control system will disable some intelligent control functions that involve speed and distance information based on the vehicle in front or obstacles when using the automatic recovery level control mode.

[0031] This invention provides an intelligent coasting energy recovery control method for pure electric vehicles. By interacting with the vehicle's intelligent driving system, navigation system, chassis electronic control system, and human-machine interface (HMI) system, the method intelligently identifies the current driving scenario and intelligently controls the level of coasting energy recovery based on different scenarios. This solves the problem that existing pure electric vehicles cannot intelligently adjust the energy recovery level based on the scenario, enabling more intelligent adjustment of the vehicle's deceleration during coasting, achieving a greater degree of energy recovery, and improving the vehicle's energy efficiency and intelligence. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below.

[0033] Figure 1 This is a schematic diagram of an intelligent coasting energy recovery control method for pure electric vehicles provided by the present invention.

[0034] Figure 2 This is a schematic diagram of the signal interaction of the gliding energy recovery control system provided in an embodiment of the present invention. Detailed Implementation

[0035] To enable those skilled in the art to better understand the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and implementation methods.

[0036] To address the issue that current pure electric vehicles require manual adjustment of energy recovery levels, this invention provides an intelligent coasting energy recovery control method for pure electric vehicles. This method solves the problem that existing pure electric vehicles cannot intelligently adjust the energy recovery level based on the scenario during energy recovery. It can more intelligently adjust the vehicle's deceleration during coasting, achieving a greater degree of energy recovery and improving the vehicle's energy efficiency and intelligence.

[0037] like Figure 1 and Figure 2 As shown, a method for intelligent coasting energy recovery control of a pure electric vehicle includes:

[0038] S1: The coasting energy recovery control system interacts with the intelligent driving system to obtain information on the speed and distance of vehicles or obstacles ahead.

[0039] S2: Calculates the distance and relative speed between the vehicle and the vehicle in front or the obstacle ahead based on the speed and distance information of the vehicle or obstacle ahead.

[0040] S3: When the relative vehicle speed is greater than the calibrated limit, the vehicle is determined to be in a free coasting state, and the coasting energy recovery torque is controlled to be 0.

[0041] S4: When the relative vehicle speed is less than the calibrated limit, recovery control is performed according to the set minimum coasting energy recovery torque.

[0042] Specifically, the intelligent driving system collects speed and distance information of vehicles or obstacles ahead using onboard radar and cameras. The coasting energy recovery control system obtains information such as relative speed and relative distance collected by the intelligent driving system through the vehicle controller, and then adjusts the coasting energy recovery torque according to the relative speed and relative distance to achieve intelligent adjustment of the energy recovery level. This method can more intelligently adjust the vehicle deceleration during coasting, achieving a greater degree of energy recovery and improving the vehicle's energy efficiency and intelligence.

[0043] The method also includes:

[0044] The coasting energy recovery control system interacts with the navigation system to obtain information on road congestion ahead, the current scene, and road speed limits.

[0045] The distance between the vehicle and the congested section is calculated based on the road congestion information ahead, and a recovery strategy inversely proportional to the energy recovery torque is used for recovery control.

[0046] When the distance between the vehicle and the congested road section ahead is less than a set limit, recovery control is performed using the set maximum coasting energy recovery torque.

[0047] In practical applications, under congested road conditions, the torque for coasting energy recovery is related to the degree of road congestion, the length of the congestion, and the distance from the congested section. The specific strategies are as follows:

[0048] 1) The smaller the distance between the vehicle and the congested section of road, the greater the recovery torque.

[0049] 2) The recovery torque reaches its maximum when the distance between the vehicle and the congested road ahead is less than the calibrated limit.

[0050] 3) The level and length of congestion will be used to adjust the recovery torque in real time.

[0051] The method also includes:

[0052] The coasting energy recovery control system interacts with the vehicle chassis electronic control system to obtain the vehicle's steering angle information and dynamic stability control information.

[0053] The vehicle's driving scenario is determined based on the vehicle's steering angle information and dynamic stability control information. In the steering scenario, it is determined whether the steering angle of the vehicle's steering wheel is greater than the calibrated angle. If so, the coasting energy recovery torque remains unchanged.

[0054] Furthermore, when the vehicle is in an uphill scenario, the recovery torque is gradually reduced as the slope increases, while the recovery torque is adjusted in real time based on the vehicle speed.

[0055] When the vehicle is on a downhill slope, the recovery torque gradually increases as the slope increases, and the recovery torque is adjusted in real time based on the vehicle speed.

[0056] Furthermore, when the vehicle is in a special speed-limited scenario and the actual vehicle speed is higher than the speed limit requirement, the maximum coasting energy recovery torque is used for recovery control.

[0057] The method also includes:

[0058] The coasting energy recovery control system interacts with the human-machine interface (HMI) system, which is installed on the vehicle's MP5 and allows manual and automatic options for coasting energy recovery level control to be set via the MP5's central control screen.

[0059] When the coasting energy recovery level control is in the manual option, the coasting energy recovery control system enters the manual recovery level control mode.

[0060] When the coasting energy recovery level control is set to the automatic option, the coasting energy recovery control system enters the automatic recovery level control mode.

[0061] In practical applications, users can set the coasting energy recovery level to "Auto" through the MP5 central control screen, which puts the coasting energy recovery control system into automatic recovery level control mode. By comprehensively judging the vehicle's information, the speed and distance of vehicles or obstacles in front, the degree of road congestion, and road speed limit information, the system can intelligently identify the current driving scenario and realize intelligent control of the coasting energy recovery level based on different driving scenarios.

[0062] The method also includes: acquiring vehicle fault information; if the intelligent driving system is in a fault state, the coasting energy recovery control system enters the manual recovery level control mode and disables the automatic recovery level control mode.

[0063] The method also includes disabling certain intelligent control functions involving speed and distance information based on the vehicle ahead or obstacles when the coasting energy recovery control system is in automatic recovery level control mode if the vehicle is not equipped with a navigation system or the navigation system is malfunctioning.

[0064] In practical applications, 1) when the vehicle is not equipped with a navigation system, the Auto mode will be disabled if the intelligent driving system is in a faulty state.

[0065] 2) When the vehicle is equipped with a navigation system, if both the navigation system and the intelligent driving system are malfunctioning, the Auto mode will be disabled.

[0066] 3) When the vehicle is equipped with a navigation system, if only the intelligent driving system is in a faulty state, the Auto mode can still be used, but some functions will be disabled. The disabled functions mainly involve intelligent control functions based on the distance and speed information of the vehicle in front or obstacles.

[0067] 4) When the vehicle is equipped with a navigation system, if only the navigation system is in a faulty state, the Auto mode can still be used, but some functions will be disabled. The disabled functions mainly involve functions related to navigation information.

[0068] As can be seen, this invention provides an intelligent coasting energy recovery control method for pure electric vehicles. By interacting with the vehicle's intelligent driving system, navigation system, chassis electronic control system, and human-machine interface (HMI) system, the method intelligently identifies the current driving scenario and, based on different scenarios, intelligently controls the level of coasting energy recovery. This solves the problem that existing pure electric vehicles cannot intelligently adjust the energy recovery level based on the scenario, enabling more intelligent adjustment of the vehicle's deceleration during coasting, achieving a greater degree of energy recovery, and improving the vehicle's energy efficiency and intelligence.

[0069] The structure, features, and effects of the present invention have been described in detail above with reference to the embodiments shown in the figures. The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to have equivalent changes, shall be within the protection scope of the present invention as long as they do not exceed the spirit covered by the specification and figures.

Claims

1. A control method for intelligent coasting energy recovery of a pure electric vehicle, characterized in that, The application comprises the following steps: The coasting energy recovery control system is signal-interacted with the intelligent driving system to obtain the speed and distance information of the front vehicle or obstacle; The distance and relative speed between the ego vehicle and the front vehicle or obstacle are calculated according to the speed and distance information of the front vehicle or obstacle; When the relative speed is greater than the calibrated limit value, it is determined that the ego vehicle is in a free coasting state, and the coasting energy recovery torque is controlled to be 0; When the relative speed is less than the calibrated limit value, the minimum coasting energy recovery torque is set to control the recovery; The coasting energy recovery control system is signal-interacted with the navigation system to obtain the front road congestion information, the current scene and the road speed limit information; The distance between the vehicle and the congestion section is calculated according to the front road congestion information, and the recovery control is performed according to the recovery strategy that the energy recovery torque is inversely proportional to the distance; When the distance between the vehicle and the front congestion section is less than the set limit value, the maximum coasting energy recovery torque is set to control the recovery; In the congestion road condition, the coasting energy recovery torque is related to the road congestion degree, the congestion length and the distance to the congestion section, and the specific strategy is as follows: The smaller the distance between the vehicle and the congestion section, the greater the recovery torque; When the distance between the vehicle and the front congestion section is less than the set limit value, the recovery torque reaches the maximum; The congestion degree and the congestion length will correct the recovery torque in real time.

2. The control method according to claim 1, wherein, The application further comprises the following steps: The coasting energy recovery control system is signal-interacted with the vehicle chassis electronic control system to obtain the steering angle information and the dynamic stability control information of the vehicle; The driving scene of the vehicle is determined according to the steering angle information and the dynamic stability control information of the vehicle, and when the steering scene is determined, it is determined whether the steering angle of the steering wheel of the vehicle is greater than the calibrated angle, and if yes, the coasting energy recovery torque remains unchanged.

3. The control method according to claim 2, wherein, The application further comprises the following steps: When the vehicle is in an uphill scene, the recovery torque is gradually reduced with the increase of the slope, and the recovery torque is corrected in real time based on the vehicle speed; When the vehicle is in a downhill scene, the recovery torque is gradually increased with the increase of the slope, and the recovery torque is corrected in real time based on the vehicle speed.

4. The control method according to claim 3, wherein, The application further comprises the following steps: When the vehicle is in a special speed limit scene and the actual vehicle speed is higher than the speed limit requirement, the maximum coasting energy recovery torque is set to control the recovery.

5. The control method according to claim 4, wherein, The application further comprises the following steps: The coasting energy recovery control system is signal-interacted with the human-machine interaction (HMI) system, the human-machine interaction (HMI) system is arranged on the vehicle-mounted MP5, and the manual option and the automatic option of the coasting energy recovery level control are set through the central screen of the MP5; When the coasting energy recovery level control is in the manual option, the coasting energy recovery control system enters the manual recovery level control mode; When the coasting energy recovery level control is in the automatic option, the coasting energy recovery control system enters the automatic recovery level control mode.

6. The control method according to claim 5, wherein, The application further comprises the following steps: The vehicle fault information is obtained, if the intelligent driving system is in a fault state, the coasting energy recovery control system enters the manual recovery level control mode, and the automatic recovery level control mode is prohibited.

7. The control method according to claim 6, wherein, The application further comprises the following steps: If the vehicle is not equipped with a navigation system or the navigation system is in a failure state, some intelligent control functions related to the speed and distance information of the preceding vehicle or obstacle are disabled when the coasting energy recovery control system adopts the automatic recovery level control mode.

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