In order to lower exhaust gas pollution and attain optimum fit between fuel consumption and powers, we adopt Single-Chip Microcomputer to control mechanical transmission of tractor automatically. In this paper, operating principle, hardware construction and function of the Single-Chip Microcomputer system are detail introduced; main program, control of throttle and keyboard interrupt program are given. The design of hardware is simple and reasonable, the software emphasizes ability of anti-interference and fault-tolerant.
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