Method for controlling traction of electric vehicle

A traction control, electric vehicle technology, applied in the automotive field, can solve problems such as vehicle safety driving threats, reduce vehicle acceleration performance, slippage, etc., and achieve the effects of improving power experience, improving acceleration performance, and preventing slippage.

Active Publication Date: 2012-06-20
GREAT WALL MOTOR CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing electric vehicle control system uses the motor as an actuator, and the power demand of the system is given by the vehicle controller or analog sensors. This control method cannot effectively use the characteristics of the fast response of the motor power. When driving and the motor torque is large, it is very easy to slip,

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  • Method for controlling traction of electric vehicle
  • Method for controlling traction of electric vehicle
  • Method for controlling traction of electric vehicle

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Embodiment Construction

[0034]In the present invention, a vehicle state gain calculator, a vector controller, an error observer and an optimal slip rate tracker are arranged in the controller. Among them, the vehicle state gain calculator is used to calculate the expected running state of the vehicle, complete the vehicle initialization and regularly compare the vehicle state changes; the vector controller is used for the motor vector control calculation, responsible for controlling the motor to achieve the target torque; the error observer is responsible for Compare the difference between the calculated vehicle speed and the actual vehicle speed; the optimal slip rate tracker is used to calculate the slip rate and find the optimal value, and then adjust the real-time torque given value to adjust the vehicle running state.

[0035] When the system is running, the vehicle state gain calculator first analyzes the driver's intention, torque gain curve, vehicle acceleration curve, and vehicle expected spe...

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Abstract

The invention discloses a method for controlling the traction of an electric vehicle. A motor is driven by one controller; and the controller is internally provided with a finished vehicle status gain calculator, a vector controller, an error observer and an optimal slip ratio tracker. When a system operates, the finished vehicle status gain calculator analyzes the intention of a driver according to initialized vehicle information and real-time read finished vehicle status information and determines a torque gain curve, a vehicle acceleration curve and a vehicle desired speed; then the vector controller controls the motor to be up to a preset torque; next, the error observer compares the error between an actual value and a calculated value of the speed and adjusts a road condition resistance coefficient; and the optimal slip ratio tracker calculates the real-time slip ratio of the vehicle and adjusts a slip coefficient in a torque equation according to the calculated value so that the vehicle keeps in an optimal slip ratio state. By using the method, the phenomenon of slip is effectively prevented, and the acceleration performance and the side stability of the electric vehicle are improved.

Description

technical field [0001] The invention relates to a traction force control method suitable for two-wheel drive / four-wheel drive electric vehicles, which belongs to the technical field of automobiles. Background technique [0002] The traction force of an electric vehicle is provided by its drive motor. One of the main characteristics of the motor that distinguishes it from the engine is fast torque response, high torque control accuracy, and the ability to calculate the actual torque through current feedback. The existing electric vehicle control system uses the motor as an actuator, and the power demand of the system is given by the vehicle controller or analog sensors. This control method cannot effectively use the characteristics of the fast power response of the motor. When driving and the motor torque is large, it is easy to slip, so that the adhesion of the vehicle cannot be used to the greatest extent (referring to the limit value of the tangential force of the road on ...

Claims

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Application Information

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IPC IPC(8): B60L15/20
CPCY02T10/72
Inventor 高泽霖翁浩宇刘宝
Owner GREAT WALL MOTOR CO LTD
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