Study On Hardware Implementation Of Control Method Of Vehicle Stability Control

With the improving of highway, upping of average velocity and density of vehicles, urgent interests were put on vehicle safety and ride comfort. As the latest control techniques, VSC (vehicle stability control) is the international research focus on the vehicle active safety field. VSC can improve handling performance under any situations, and enhance the security at high speed to avoid traffic accident. The development of VSC involves mechanism, electronics, hydraulics, hardware and software design and field test validation. In traditional way of product development of vehicle electronic control system, a huge amount of vehicle field tests are required to investigate the control laws by a great number of repeated modifications, so the cycle time is inevitably increased. Because of fierce competition in today's business environment, the traditional methods obviously can't satisfy the rapid development of automobile industry.In this paper, a new rapid development method is proposed to develop control system efficiently, and the relative system development platform is built. This platform can simulate VSC system in laboratory environment, which covers the whole process of concept and function design, system modeling off-line simulation, code automatic generation, real-time hardware-in-loop simulation (HILS) and final vehicle test validation.As one of the main techniques of VSC, Direct-yaw-moment control (DYC) is the latest method of chassis control. By independent controlling training and braking force of four tires, additional yaw moment is generated to make vehicle to follow the driver's command. The vehicle system dynamic model consists of vehicle model, hydraulic system model and bake model is built, and the feedback controller by Matlab-Lmi toolbox based on the model-matching technology and H∞theory is designed.Based on HILS techniques, overall design of rapid development platform is decided, and its functions and configuration of simulation in the real-time simulation environment is presented. Under the direction of the overall scheme and aim of the DYC system, details of construction process of this platform including the software part, hardware part and interface are discussed with consideration of its functions extended. The whole processes and methods of development of DYC on this platform are expatiated.Because the technology of 4WS is not perfect in reality, however, the method of logic threshold control method is popular and low cost, so DYC system is built from our own designs and carried out the simulation of hydraulic system model in loop. Various simulations are carried out , notable decrease of both yaw rate and side slip angle deviation verify the effectiveness of DYC system, which shows that the control method has considerable accuracy and practical application, and lays the solid foundation for the future actual car experiment.