Abstract
The electrical-mechanical interfaces of servo valves and proportional valves display electromagnetic nonlinearities, such as hysteresis and saturation. In many cases, these nonlinearities have usually unfavorable effects on the performance of the whole control system. For this reason the concept of stage proportional control is put forward in this paper. The fundamental idea of the stage proportional control is to divide the whole stroke of the hydraulic (pneumatic) control valve into a number of stages in which independent proportional control is carried out.In this way, the electromagnetic nonlinearities can be greatly reduced. The stage proportional control can be realized by using a linear or rotary stepper motor controlled in a continuous mode. Experimental results demonstrated the electromagnetic nonlinearities associated with proportional control are indeed reduced and the position stiness of the spool and the resolution accuracy are also enhanced. An application example of the stage proportional control is also presented in this paper.
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