CAN Bus protocol of auto local area network and SAE J1939 code rules are researched, which application is introduced in this paper. Based on the CAN Bus communication protocol, J1939's coding system is formed with CAN Bus 29 bit IDENTIFIER. Refer to J1939, this paper established CAN communication codes and malfunction diagnosis codes used on electric passenger car and put forward an implementation method. This communication protocol has been applied to a pure electric low floor transit bus JingHua BK6121EV. This system is proved to be stable in test bed and vehicle test, with reliable data communication and favorable real time control.
Index Terms -CAN Bus; Vehicle Control system; EV (electric vehicle)I.
Researching optimization problems of controller is need of industrial process control ,in which PID controller is widely used,which its parameters can be equivalent to optimization problems. In the industrial control the PID controller is widely used in excitation control system to improve its control performance.In order to find the optimal PID controller parameters effectively ,a kind of Adaptive Particle Swarm Optimization method (CAPSO) based on Cloud Theory is applied to fuzzy PID controller. Through the establishment of particle swarm algorithm of fuzzy PID controller parameters optimization model, which it can be used to optimize the membership function of fuzzy PID controller. Particle code adopts real coding. Particle dimension is related with the number of the input variables divided by fuzzy set and the number of control rules of whole fuzzy control system, thus the parameters of PID control are optimized on real time. The result from the simulation shows that compared with PID control and fuzzy control this system has several advantages which are small overshoots ,fast response ,and good stable performance to improve the control performance of excitation control system.
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