Pure electric vehicle driving strategy control method based on fuzzy control and dynamic programming

A pure electric vehicle, fuzzy control technology, applied in the direction of data processing management, road transportation emission reduction, etc., can solve the problems of insufficient consideration of the vehicle's driving economy, and achieve the effect of ensuring power, economy, and robustness

Active Publication Date: 2019-05-10
湖南普西智能科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are mainly aimed at identifying the driver's intentions, improving the dynamic response of the vehicle, and insufficient consideration of the vehicle's driving economy.

Method used

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  • Pure electric vehicle driving strategy control method based on fuzzy control and dynamic programming
  • Pure electric vehicle driving strategy control method based on fuzzy control and dynamic programming
  • Pure electric vehicle driving strategy control method based on fuzzy control and dynamic programming

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Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: The present invention provides a pure electric vehicle driving strategy control method based on fuzzy control and dynamic programming, see figure 1 , including the following steps:

[0047] S1: Obtain the accelerator pedal opening, the rate of change of the accelerator pedal opening, the value of the remaining battery power, and the torque supplementary load factor, with the accelerator pedal opening, the rate of change of the accelerator pedal opening, and the value of the remaining battery power as input variables, and the torque The supplementary load factor is used as the output variable to establish fuzzy control rules;

[0048] S2: Divide the driving mode, including power mode, comfort mode and energy-saving mode, and obtain the torque supplementary load coefficients in the three modes according to the fuzzy control rules;

[0049] S3: Obtain the target load factor according to the torque supplementary load factor and the current load factor, and ob...

Embodiment 2

[0052] Embodiment 2: The principle of normal driving of a pure electric vehicle is that the motor system outputs the actual torque after receiving the torque command from the vehicle controller, and drives the wheels through the transmission device. Therefore, determining the required torque characteristics of the drive motor is the key to study the drive control strategy. The opening of the accelerator pedal can reflect the driver's demand for the torque of the drive motor, and the motor speed can represent the output capability of the motor's maximum torque at the current speed. In order to more clearly determine the relationship between the accelerator pedal opening and the driver's demand torque, the relationship between the motor torque load factor L and the accelerator pedal opening P_acc is defined as:

[0053] L=f(P_acc)

[0054] see figure 2 , according to the division of vehicle working modes, three relationship curves of motor torque load factor L and accelerator p...

specific Embodiment approach

[0102] In the first step, according to the driving requirements of power mode, comfort mode and energy-saving mode, the relationship curves of three kinds of motor torque load coefficients and accelerator pedal openings are formulated respectively;

[0103] In the second step, in order to make the motor power output corresponding to different accelerator pedal openings more uniform and smooth, the mathematical expression of the motor demand torque determined according to the motor torque load factor and the motor speed;

[0104] The third step is to design a fuzzy controller with the accelerator pedal opening, the rate of change of the accelerator pedal opening and the remaining battery power as the input variables, and the compensation load coefficient after driving intention recognition as the output variable to establish a fuzzy controller, and select the triangular function as the input and output variables The membership function of ;

[0105] The fourth step is to establis...

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Abstract

The invention discloses a pure electric vehicle driving strategy control method based on fuzzy control and dynamic programming.The pure electric vehicle driving strategy control method based on the fuzzy control and dynamic programming comprises the following steps that an accelerator opening degree, an acceleratoropening degree change rate, a battery residual power value, and atorque supplement load coefficient are obtained, the accelerator opening degree, the accelerator opening degree change rate and the battery residual power value are used as input variables, and the torque supplement load coefficient is used as an output variable to establish a fuzzy control rule; driving modesare divided, the driving modes includesa power mode, a comfort mode, and an energy saving mode, the torque supplement load coefficientsofthe three modes are obtained according to the fuzzy control rule; a target load coefficient is obtained according to the torque supplement load coefficient and a current load coefficient, and a target motor load torque is obtained through the target load coefficient; for the power mode and the comfort mode, a motor current torque is adjusted according to a target motorload torque; for the energy saving mode, the dynamic programming algorithm is used for integrating target vehicle speed and the target load coefficient to plan the torque and output the path.

Description

technical field [0001] The invention relates to the field of complete electric vehicle control, and specifically discloses a pure electric vehicle driving strategy control method based on fuzzy control and dynamic programming. Background technique [0002] With the global energy crisis and air pollution becoming increasingly severe, the development of pure electric vehicles has become an urgent task to solve energy pollution. At present, the three most critical technologies of pure electric vehicles, namely motor, battery and electronic control technology, are the core technologies for pure electric vehicles to break through the energy efficiency problem. One of the most important parts in the development of an electric vehicle is the design of its overall vehicle control system. The vehicle control system involves power on and off management, signal processing, driver intention analysis, vehicle mode management, gear management, drive control, braking energy recovery, batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W30/182B60W50/00
CPCY02T10/84
Inventor 张飞铁毛昌宏才亚民
Owner 湖南普西智能科技有限责任公司
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