THE APPLICATION OF AN IMPROVED CAN-BUS IN FLIGHT SIMULATOR

The flight simulator interface system communication network should meet requirements of determinism, real-time and reliability. This paper analyses the real-time problem of CAN-Bus with its application in flight simulator interface system. And on the basis Of basic CAN protocol, an improving method for CAN- Bus is proposed. The method divides the extended frame with CAN 2.0B into priority class subfield, queue position subfield and message filtering subfield. Through the design of system-wide priority queues and cyclical priority scheduling algorithm, the problem of message blockage caused by the CAN stochastic multi-master sending message mode is solved. Tests in the flight simulator interface system show that the improved CAN-Bus with above method has good real-time performance in heavy network load.