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All wheel individual drive electric car traction control method and device

A technology of traction control and independent drive, which is applied in the field of electric vehicles, can solve problems such as locking, inability to accurately obtain slip rate vehicles, skidding, etc., and achieve the effect of preventing skidding

Active Publication Date: 2016-01-20
BEIJING INST OF SPACE LAUNCH TECH +1
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AI Technical Summary

Problems solved by technology

On the other hand, all wheels of an all-wheel independent drive electric vehicle are actively driven wheels, which may slip or lock up. When the wheels slip severely, the wheel speed will lose the matching relationship with the actual vehicle speed.
However, the existing calculations for the vehicle speed and the traction force of each wheel are not accurate enough, especially the slip rate cannot be accurately obtained to control the vehicle slippage

Method used

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  • All wheel individual drive electric car traction control method and device
  • All wheel individual drive electric car traction control method and device
  • All wheel individual drive electric car traction control method and device

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Embodiment Construction

[0022] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] figure 1 It shows a flow chart of the traction control method for an all-wheel independent drive electric vehicle provided by an embodiment of the present invention, see figure 1 , the traction control method of an all-wheel independent drive electric vehicle provided in an embodiment of the present invention includes:

[0024] S101. Obtain tire pressure parameters of each wheel, and calculate a wheel diameter correction coefficient of each wheel according to the tire pressure parameters of each wheel.

[0025] Specifically, due to differences in the inflation of the wheels in practical applications, the wheel diameters of each wheel will be different, which will affect the calculation of the vehicle speed and slip rate. Therefore, the tire-based The pressure monitoring wheel speed compensation technology is used to accurately calculate the ve...

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Abstract

The invention provides an all wheel individual drive electric car traction control method and device; the control method comprises the following steps: obtaining a tyre pressure parameter of each wheel, calculating a wheel diameter correction factor of each wheel according to the tyre pressure parameter of each wheel; calculating tyre wheel speed of each wheel according to the wheel diameter correction factor of each wheel; calculating the whole vehicle speed according to the tyre wheel speed of each wheel, if the electric car is under a driving condition, using the minimum value of the tyre wheel speed of each wheel to calculate the whole vehicle speed, if the electric car is in a braking condition, using the maximum value of the tyre wheel speed of each wheel to calculate the whole vehicle speed; using the tyre wheel speed of each wheel and the whole vehicle speed to calculate a slippage rate of each wheel; carrying out traction control at least according to the whole vehicle speed and / or the slippage rate of each wheel. The method can solve the problems that the slippage rate and the whole vehicle speed are inaccurate in calculation, thus realizing traction control of the whole vehicle.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a traction force control method and device for an all-wheel independently driven electric vehicle. Background technique [0002] An all-wheel independent drive electric vehicle refers to an electric drive vehicle in which all wheels are actively driven and have independent driving degrees of freedom. This type of vehicle has the characteristics of good maneuverability, simple transmission structure, quick response, high system reliability, and easy realization of complex driving force control. [0003] The vehicle speed information of the wheel-drive electric vehicle is mainly obtained from the rotational speed of each wheel drive motor after proportional conversion. Vehicle speed information is an important driving parameter of the vehicle, and plays an important role in the calculation of wheel slip rate. The slip rate is an important control parameter of the vehicle driving ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/20
CPCY02T10/72
Inventor 骆志伟赵志刚谭文华胡小龙张辉刘相新韦学中王博
Owner BEIJING INST OF SPACE LAUNCH TECH
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