Control algorithm for the SBW system

With the rapid development of control technology, more and more electronic control devices are used to the car. By-wire steering system is generated in this background, and its main feature is to replace the steering wheel with the control signal and the mechanical connection between the steering wheel. Although the SBW system has yet to form a mature theory and products, but they show the advantages of variable gear ratio steering system of traditional mechanical unmatched, it is turning to technology for future research is the development of steering system the highest form. So far, almost the world's major automobile manufacturers and research institutions have invested a certain amount of human and material resources to conduct a study on the wire steering system. This paper from home and abroad on the basis of research results, focusing on the transmission ratio based on the ideal control algorithm wire steering system, do the following work: introduced by wire technology, research status and development prospects of the SBW system system architecture, performance characteristics and key technologies are briefly described. On this basis, further information on the structural principle of wire steering system, including the steering wheel assembly, steering actuator, the main controller, fail-safe system, power and so on. SBW established dynamic model and ADAMS vehicle model. Kinetic model SBW: Online control steering system based on force analysis, the establishment of a steering wheel assembly and the steering actuator dynamic model dynamic model. Then introduces the dugoff tire model, the tire aligning torque are derived the mathematical expression and modeling.Finally, the establishment of a moderately complex of four degrees of freedom (the vehicle longitudinal, lateral, yaw and roll from the mountains degrees) dynamic model of automobile. ADAMS vehicle model: software is built using ADAMS simulation of the vehicle model used in the experiment, modeling process, the performance does not affect the structure of steering system were simplified. In the ADAMS vehicle model, based on the introduction of driver model simulation and road information to verify the feasibility of the model. Objectives of the steering wheel angle wire control algorithm. In order to meet the operational stability of the vehicle steering system request, the analysis of the steering angle transmission ratio factors, made the ideal angle of wire steering system gear ratio concept. In the ideal angle of the transmission ratio based on the theory and design of the wire target front wheel steering angle control algorithm and vehicle model with a simulation test. The results show that the target front-wheel angle control algorithm to improve the car's steering characteristics of a great help. PID control algorithm for the SBW system. To further improve the car's steering characteristics, combined with the characteristics of wire steering system, proposed by-wire steering system PID control algorithm and the simulation test analysis. The results show that the algorithm by-wire steering system with good results, can enhance vehicle stability and safety of the operation. 

 

Keywords: by-wire steering system, front wheel angle, the control algorithm, simulation