Research And Implement Of Vehicle Stability Control System

Maneuvering stability of vehicle means that, vehicle can drive under the driver's intension , meanwhile , the vehicle can be resistant to interference and keep stable driving when there is an outside interference. The vehicle stability control system determines the driver's steering intension through acquisition of steering angle information, and determines if the vehicle is or will in an unstable state according to the current state, then regulars the yaw movement of vehicle by allocating braking and driving force on the wheels to enhance the maneuvering stability of vehicle.Since the middle of 1980's, with the development of computers, sensors and actuators which supporting control system ,many vehicle companies developed and manufactured various electronic control system which significantly improved the maneuvering stability. The initial concept of vehicle stability control is to make algorithm improvement based on ABS and ASR ,then it can partly solve the problem of vehicle stability .In the early 1990's, by theoretical analysis of vehicle stability theory ,people put forward the concept of directly control of vehicle yaw movement(for example ,DYC :Direct Yaw Moment Control).At present, the critical technology of vehicle stability control system is predominated by a few foreign companies. At the moment of china's accession to the WTO, the serious lag of domestic vehicle critical technology makes our vehicle industry face severe testing, therefore, we should make further research on new technologies. Based on a lot of investigation, this paper mainly engaged in works as follows:Firstly, this paper starts from the definition of vehicle stability control system, combines the research status at home and abroad, describes the necessity of this research work.Then based on the present vehicle model, in this paper, we take two-degree freedom two-track model as the model of vehicle dynamic behavior simulation, the two-degree freedom single track model as the vehicle stability reference model, and take the researches on vehicle stability control algorithm and control strategy within modern control theory limits.Based on the theoretical research and the result of researches on the ESC control approach based on the state estimation of Kalman Filter, we design the software and hardware of vehicle stability control system and realize the vehicle stability controller on an embedded platform.It may be dangerous during the experiment of vehicle stability control system. Therefore, real vehicle test directly may result in personnel casualty and property loss. So before real vehicle test, according to the features of vehicle stability control system, we build the hardware-in-loop test environment of vehicle stability control system based on scilab/scicos.