Study On Hardware Implementation Of Control Method Of Electronic Stability Program

Electronic Stability Program (ESP, in the America and Japan: Vehicle Dynamic Control system (VDC) ) is a system which can improve the handling and stability of vehicle, it was introduced in 1995 by Bosch. ESP which is developed in this paper consists of anti lock braking system and yaw moment control, can improve the safety of the vehicle greatly. A simulation with real devices for the research of vehicle handling is developed instead of the traditional virtual simulation using HILS technology. We realize the function of developing the key component of vehicle, reduce the times of experiment and cycle of development, which provide a efficient way of vehicle design.In order to grasp the control algorithms in generally to supply theoretical approach for ESP control design and promote the development in our country, the following study is proceeded:1. Working as the actuator of ABS, the hydraulic system is one of the most important parts in ABS control loop. This paper describes the new-type hydraulic system of ESP which based on the introduction of the operation principle of the electro-hydraulic proportional pressure control valve, and analyzes its feasibility from principle. Then author sets up the brake model and hydraulic system model and presents the basic physical parameters of the vehicle which is studied in this paper.2. The paper first discusses the principle and function of ABS. The while control process of A BS based on logic limits is described, and the paper also discuss the problem of how to put this control theory in engineering practice. To deal with the problems which are put forward in the chapter 2, such as the process of the wheel acceleration and deceleration signals and the estimation of vehicle velocity. To test the efficiency of the algorithms, we realize the whole algorithms in Matlab/Simulink system. The results of simulation show that the algorithms are feasible.3. The vehicle model of four wheel steering with direct yaw-moment control is built, and the feedback controller by Matlab-Lmi toolbox based on the model-matching technology and H∞theory is designed. Then author simulates the behavior with the controller and the results show that this system has good performance.4. A table on which the testing component is installed is developed, the control algorithm is also developed. Then we load down the algorithms from Simulink to dSPACE and build an ESP controller with part of peripheral circuit by self-design. Finally the ABS control logic and DYC control logic are combined. To prove the designed control logic, the hydraulic system in simulation loop testing is designed and realized. Test results verified the validity of the designed logic. This part of work is the foundation for the design of practical control logic and electronic controlling unit.