In order to meet the control and communication requirements of a large intelligent grain combine with a feeding capacity of 15 kg developed by YTO Group Corporation,a smart CAN bus scheme and its application system for combined harvest are proposed and designed.The system is based on CAN2.0B protocol,and the principle,method and implementation of CAN bus application layer protocol are designed.The results of vehicle verification and field experiment showed that:The network architecture not only realizes the control and intelligent monitoring of the whole vehicle of the grain combine,but also the load rate of all buses is less than 30％at the baudrate of 250 kb/s.The system is stable and reliable,with strong portability and expansibility,and has universality in intelligent monitoring and control system of other large agricultural machinery or construction machinery.
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