A new energy vehicle multi-gear energy recovery adjusting method

Abstract

The present application relates to a kind of new energy automobile multi-gear energy recovery regulating method, comprising: signal processing, driver selects and displays energy recovery mode and energy recovery intensity by vehicle-mounted central control screen or multimedia screen, and vehicle enters energy recovery state;Mode selection, current energy recovery gear is selected by vehicle controller control auxiliary brake switch;Torque control, vehicle controller calculates energy recovery target torque according to current selected energy recovery mode and energy recovery intensity, combined with motor speed, brake pedal opening signal;Vehicle controller is different from current vehicle speed with target vehicle speed, and vehicle speed deviation is used as input, and compensation torque is calculated by PID calculation module, compensation torque is added with recovery torque initial value, and adaptive energy recovery torque is obtained, the absolute value of adaptive energy recovery torque and energy recovery target torque is taken as the output target torque of motor, and vehicle is controlled to carry out energy recovery.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and in particular to a method for adjusting the multi-level energy recovery of new energy vehicles. Background Technology

[0002] New energy electric vehicles are primarily powered by electrical energy stored in power batteries. Given that the power batteries have a fixed rated capacity, improving the driving range of electric vehicles is crucial for their development. Existing technology one, application number: 202010944718.1, discloses an energy recovery method and electronic device for electric vehicles; however, existing technology one has drawbacks:

[0003] 1. The energy recovery coefficient can be adjusted via the gear shift lever or the in-vehicle central control screen. The physical structure of the gear shift lever means that it cannot provide multiple levels of selection. If there are many levels, it will be complicated to operate. The in-vehicle central control screen cannot be adjusted during vehicle operation and cannot meet the requirements for changes in energy recovery torque under complex working conditions.

[0004] 2. Energy recovery requires frequent adjustments by the user based on operating conditions, and improper settings may lead to excessive or insufficient energy recovery intensity. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a multi-level energy recovery adjustment method for new energy vehicles.

[0006] This invention is achieved using the following technical solution:

[0007] A method for multi-level energy recovery regulation in new energy vehicles includes:

[0008] Signal processing: The driver selects and displays the energy recovery mode and energy recovery intensity through the in-vehicle central control screen or multimedia screen, and the vehicle enters the energy recovery state;

[0009] Mode selection: The auxiliary braking switch is controlled by the vehicle controller to select the current energy recovery level.

[0010] Torque control: The vehicle controller calculates the target torque for energy recovery based on the currently selected energy recovery mode and energy recovery intensity, combined with the motor speed and brake pedal opening signal.

[0011] The vehicle controller acquires the vehicle speed when entering the energy recovery state as the target vehicle speed;

[0012] The vehicle controller calculates the difference between the target vehicle speed and the current vehicle speed, using the speed deviation as an input. It then calculates the compensation torque through a PID calculation module, adds the compensation torque to the initial value of the recovery torque to obtain the adaptive energy recovery torque, and takes the larger of the absolute values ​​of the adaptive energy recovery torque and the energy recovery target torque as the output target torque of the motor to control the vehicle to perform energy recovery.

[0013] Preferably, the in-vehicle central control screen or multimedia screen is equipped with virtual buttons, and the driver selects the energy recovery mode and energy recovery intensity through the virtual buttons; the in-vehicle central control screen or multimedia screen sends the selected energy recovery mode and energy recovery intensity information to the vehicle controller via the CAN bus; the vehicle controller receives the selection information, identifies the selected energy recovery mode and energy recovery intensity, and records and stores the selected energy recovery mode and energy recovery intensity information; after the vehicle is powered on or off, the vehicle controller sends the last selected energy recovery mode and energy recovery intensity information to the CAN bus.

[0014] Preferably, the energy recovery levels include level 0, level 1, and level 2. The vehicle's central control screen or multimedia screen has a primary interface and a secondary interface. Level 0, level 1, and level 2 energy recovery are displayed and selected on the primary interface. After selecting an energy recovery level, the user enters the secondary interface to select the energy recovery mode and intensity for the currently selected level. The energy recovery mode includes energy recovery comfort and energy recovery economy.

[0015] Preferably, the energy recovery mode includes an energy recovery comfort mode and an energy recovery economy mode. The energy recovery comfort mode is a mode with gentle braking force at the currently selected energy recovery level, and the energy recovery economy mode is a mode with greater braking force at the currently selected energy recovery level.

[0016] The energy recovery intensity is divided into an intensity coefficient of 0-10. The corresponding energy recovery intensity coefficient is selected according to the energy recovery mode.

[0017] Preferably, the initial value of the recovered torque = [(1 - coasting energy recovery load rate) / minimum pedal opening value corresponding to 100% load rate * current brake pedal opening + coasting energy recovery load rate] * current torque output corresponding to the current motor speed and the motor external characteristic curve;

[0018] The coasting energy recovery load rate = a + energy recovery intensity coefficient * (ba) / 10; the vehicle controller, based on the selected energy recovery mode, outputs the minimum coasting load rate a and the maximum coasting load rate b through the fuzzy calculation module, and outputs the coasting energy recovery load rate in combination with the energy recovery intensity coefficient.

[0019] The minimum pedal opening value corresponding to 100% load rate = d - energy recovery intensity coefficient * (dc) / 10; the vehicle controller, based on the selected energy recovery mode, outputs the minimum value c and the maximum value d corresponding to 100% load rate through the fuzzy calculation module, and outputs the minimum pedal opening value corresponding to 100% load rate in combination with the energy recovery intensity coefficient.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] This invention does not involve complex control logic, does not require high computing power from the controller, and has advantages such as being mature and reliable, suitable for engineering problems, and having a simple and clear algorithm.

[0022] This invention provides a multi-level subdivision of energy recovery modes, expanding the energy recovery modes available to vehicles without adding new external equipment, and largely meeting the personalized needs of customers in different market segments.

[0023] This invention ensures that the vehicle speed does not increase when driving on long downhill slopes, reduces the frequency of the driver's braking, and enhances driving comfort. Attached Figure Description

[0024] Figure 1 This is a flowchart of the present invention;

[0025] Figure 2 This is a schematic diagram illustrating the calculation of the gliding energy recovery load rate of the present invention;

[0026] Figure 3 This is a schematic diagram illustrating the calculation of the minimum pedal opening value corresponding to 100% load rate in this invention;

[0027] Figure 4 This is a schematic diagram illustrating the calculation of the initial value of the recovered torque in this invention;

[0028] Figure 5 This is a schematic diagram illustrating the calculation of adaptive energy recovery torque in this invention. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0030] like Figure 1As shown, a multi-level energy recovery regulation method for new energy vehicles includes:

[0031] Signal processing: The driver selects and displays the energy recovery mode and energy recovery intensity through the in-vehicle central control screen or multimedia screen, and the vehicle enters the energy recovery state;

[0032] Mode selection: The auxiliary braking switch is controlled by the vehicle controller to select the current energy recovery level.

[0033] Torque control: The vehicle controller calculates the target torque for energy recovery based on the currently selected energy recovery mode and energy recovery intensity, combined with the motor speed and brake pedal opening signal.

[0034] The vehicle controller acquires the vehicle speed when entering the energy recovery state as the target vehicle speed;

[0035] The vehicle controller calculates the difference between the target vehicle speed and the current vehicle speed, using the speed deviation as an input. It then calculates the compensation torque through a PID calculation module, adds the compensation torque to the initial value of the recovery torque to obtain the adaptive energy recovery torque, and takes the larger of the absolute values ​​of the adaptive energy recovery torque and the energy recovery target torque as the output target torque of the motor to control the vehicle to perform energy recovery.

[0036] The vehicle's central control screen or multimedia screen is equipped with virtual buttons, allowing the driver to select the energy recovery mode and energy recovery intensity. The central control screen or multimedia screen then sends the selected energy recovery mode and energy recovery intensity information to the vehicle controller via the CAN bus. The vehicle controller receives the selection information, identifies the selected energy recovery mode and energy recovery intensity, and records and stores the selected energy recovery mode and energy recovery intensity information. After the vehicle is powered on or off, the vehicle controller sends the last selected energy recovery mode and energy recovery intensity information to the CAN bus.

[0037] The energy recovery levels include 0, 1, and 2. The vehicle's central control screen or multimedia screen has a primary interface and a secondary interface. The primary interface displays and allows selection of energy recovery levels 0, 1, and 2. After selection, the secondary interface allows users to choose the energy recovery mode and intensity. Energy recovery modes include comfort and economy.

[0038] Preferably, the energy recovery function can be turned off at the 0th energy recovery level, but not at other levels.

[0039] After selecting to enter the 0-level energy recovery mode, you will enter the secondary interface under the 0-level energy recovery mode. After selecting either the energy recovery comfort mode or the energy recovery economy mode, the corresponding mode indicator light will be lit, indicating that the current 0-level energy recovery is in the selected mode. If you select the energy recovery off option under the 0-level energy recovery interface, the energy recovery off indicator light on the vehicle's central control screen will be lit. When the vehicle's auxiliary braking switch is currently set to energy recovery 0 level, the energy recovery mode is energy recovery off.

[0040] The energy recovery modes include a comfort mode and an economy mode. The comfort mode provides gentle braking force at the currently selected energy recovery level, while the economy mode provides greater braking force at the currently selected energy recovery level.

[0041] The Comfort mode for energy recovery provides a smooth braking force at the currently selected energy recovery level, offering a more comfortable braking experience; the Economy mode for energy recovery provides a stronger braking force at the currently selected energy recovery level, offering higher recovery efficiency.

[0042] Energy recovery intensity is divided into intensity coefficients of 0-10. Select the corresponding energy recovery intensity coefficient according to the energy recovery mode.

[0043] The energy recovery intensity provides an intensity coefficient of 0-10, which indicates the energy recovery mode. Selecting the corresponding energy recovery intensity coefficient will increase or decrease energy recovery.

[0044] like Figures 2-5 As shown, the initial value of the recovered torque = [(1 - coasting energy recovery load rate) / minimum pedal opening value corresponding to 100% load rate * current brake pedal opening + coasting energy recovery load rate] * current motor speed and the current torque output corresponding to the motor external characteristic curve;

[0045] Coasting energy recovery load rate = a + energy recovery intensity coefficient * (ba) / 10; The vehicle controller, based on the selected energy recovery mode, outputs the minimum coasting load rate 'a' and the maximum coasting load rate 'b' through the fuzzy calculation module, and combines the energy recovery intensity coefficient to output the coasting energy recovery load rate.

[0046] The minimum pedal opening value corresponding to 100% load rate = d - energy recovery intensity coefficient * (dc) / 10; the vehicle controller, based on the selected energy recovery mode, outputs the minimum value c and the maximum value d corresponding to 100% load rate through the fuzzy calculation module, and outputs the minimum pedal opening value corresponding to 100% load rate in combination with the energy recovery intensity coefficient.

Claims

1. A method for multi-level energy recovery regulation in new energy vehicles, characterized in that, include: Signal processing: The driver selects and displays the energy recovery mode and energy recovery intensity through the in-vehicle central control screen or multimedia screen, and the vehicle enters the energy recovery state; Mode selection: The auxiliary braking switch is controlled by the vehicle controller to select the current energy recovery level. Torque control: The vehicle controller calculates the target torque for energy recovery based on the currently selected energy recovery mode and energy recovery intensity, combined with the motor speed and brake pedal opening signal. The vehicle controller acquires the vehicle speed when entering the energy recovery state as the target vehicle speed; The vehicle controller calculates the difference between the target vehicle speed and the current vehicle speed, using the speed deviation as an input. It then calculates the compensation torque through a PID calculation module, adds the compensation torque to the initial value of the recovery torque to obtain the adaptive energy recovery torque, and takes the larger of the absolute values ​​of the adaptive energy recovery torque and the energy recovery target torque as the output target torque of the motor to control the vehicle to perform energy recovery.

2. The multi-level energy recovery adjustment method for new energy vehicles according to claim 1, characterized in that, The vehicle's central control screen or multimedia screen is equipped with virtual buttons, through which the driver selects the energy recovery mode and energy recovery intensity. The vehicle's central control screen or multimedia screen sends the selected energy recovery mode and energy recovery intensity information to the vehicle controller via the CAN bus. The vehicle controller receives the selection information, identifies the selected energy recovery mode and energy recovery intensity, and records and stores the selected energy recovery mode and energy recovery intensity information. After the vehicle is powered on or off, the vehicle controller sends the last selected energy recovery mode and energy recovery intensity information to the CAN bus.

3. The multi-level energy recovery adjustment method for new energy vehicles according to claim 2, characterized in that, The energy recovery levels include level 0, level 1, and level 2. The vehicle's central control screen or multimedia screen has a primary interface and a secondary interface. Levels 0, 1, and 2 are displayed and selected on the primary interface. After selecting an energy recovery level, the user enters the secondary interface to choose the energy recovery mode and intensity. The energy recovery mode includes energy recovery comfort and energy recovery economy.

4. The multi-level energy recovery adjustment method for new energy vehicles according to claim 3, characterized in that, The energy recovery modes include a comfort mode and an economy mode. The comfort mode is a mode with gentle braking force at the currently selected energy recovery level, while the economy mode is a mode with greater braking force at the currently selected energy recovery level. The energy recovery intensity is divided into an intensity coefficient of 0-10. The corresponding energy recovery intensity coefficient is selected according to the energy recovery mode.

5. The multi-level energy recovery adjustment method for new energy vehicles according to claim 4, characterized in that, The initial value of the recovered torque = [(1 - coasting energy recovery load rate) / minimum pedal opening value corresponding to 100% load rate * current brake pedal opening + coasting energy recovery load rate] * current motor speed and the current torque output corresponding to the motor external characteristic curve; The coasting energy recovery load rate = a + energy recovery intensity coefficient * (ba) / 10; the vehicle controller, based on the selected energy recovery mode, outputs the minimum coasting load rate a and the maximum coasting load rate b through the fuzzy calculation module, and outputs the coasting energy recovery load rate in combination with the energy recovery intensity coefficient. The minimum pedal opening value corresponding to 100% load rate = d - energy recovery intensity coefficient * (dc) / 10; the vehicle controller, based on the selected energy recovery mode, outputs the minimum value c and the maximum value d corresponding to 100% load rate through the fuzzy calculation module, and outputs the minimum pedal opening value corresponding to 100% load rate in combination with the energy recovery intensity coefficient.

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