Abstract
The speed control system of diesel engine is one typical nonlinear system. In order to control speed of the engine, in the paper, the nonlinear model of the 2135 engine governor is established. And the discrete sliding mode variable structure controller is designed. In-ring simulation of MATLAB has proved that when controlling a nonlinear system, the sliding mode variable structure control (VSC) has characteristics such as strong adaptive ability, fine static and dynamic qualities, good robustness, etc.. Repeated bench tests also verify that the sliding mode variable structure control is able to solve problems that for the conventional PID controller, the overshoot is too big, regulating time is too long and resistibility to external disturbances are bad.
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