| 摘要 |
A control system controls a hydrostatic transmission having an engine driven variable displacement pump coupled to a fixed displacement motor. The pump has a swashplate which is controlled by a control signal generated by the control system. The control system includes a speed command signal generator, a motor speed sensor for generating a sensed motor speed signal, an engine speed sensor for generating an engine speed signal, and a control unit which generates the control signal as a function thereof. The control unit generates a desired motor speed signal as a function of the speed command signal and the engine speed signal, generates a feed-forward command signal as a function of the desired motor speed signal, generates a difference signal as a difference between the desired motor speed signal and the sensed motor speed signal, generates an integral signal by applying an integral function to the difference signal, generating a sum signal as a summation of the feed-forward command signal and the integral signal, and generating the control signal as a function of the sum signal.
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