Control method and control system of vehicle yaw stability and system thereof

Abstract

The invention discloses a control method and a control system of vehicle yaw stability. The control system of the vehicle yaw stability comprises a detection module, a data base, a calculating module and a control module, wherein the calculating module respectively obtains individual turning character weighted value in corresponding to the data base according to the vehicle lateral acceleration, the wheel axle overhang load, the vehicle speed and a turning single of a steering wheel obtained through the detection module, works out a turning characteristic value in order to determine the ideal yaw rate, works out a steady state turning angle of vehicle wheels through a difference value between the ideal yaw rate and the real yaw rate when the real yaw rate is not proximately equal to the ideal yaw rate, and therefore the turning angle of each vehicle wheel is adjusted and controlled within the steady state turning angle. Therefore, the dynamic weight ratio is used for determination of the ideal yaw rate, not only accuracy is improved, but also a vehicle can keep stable in the dynamic process, and safety of the vehicle can be improved.

Description

technical field [0001] The present invention relates to a control method and its system, in particular to a vehicle yaw stability control method and its system. Background technique [0002] Road traffic accidents cause people to suffer heavy loss of life and property, and also cause irreparable family and social problems. In order to improve the safety of road traffic, academia and the automotive industry are committed to developing safer and more intelligent vehicles to help drivers avoid critical situations, prevent accidents or reduce accident injuries. [0003] The electronic stability control system of the vehicle can actively intervene in an emergency when manpower is too late to respond, and quickly correct the vehicle's brakes and engine output, etc., to help the driver survive the crisis safely. For example, when the vehicle is cornering at high speed or the center of gravity of the vehicle body is high, there will be lateral sliding and yaw rotation. yaw rate), ...

AI Technical Summary

Problems solved by technology

[0007] However, due to the way of brake intervention, there will be a shortcoming of slow reaction rate and deceleration of the vehicle due to the delay time of oil pressure build-up

[0008] And the vehicle will have different wheel steering characteristics due to the different configuration of the center of gravity such as front-wheel drive or rear-wheel drive. Therefore, the yaw rate is estimated by using the existing steering wheel steering angle, vehicle speed, and load as parameters, or as The basis of steering control is not suitable for all types of vehicles, especially the front-wheel drive and rear-wheel drive models with different load ratios. There is still room for improvement in terms of accuracy and steady-state effects. In addition, only by vehicle speed Determine the change of wheel steering, the calculated ideal yaw rate may not meet the actual demand

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