To improve the accuracy of control measures

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(1) to compensate for the lag time. First determination of the actual lag time of the valves in the system, and then in determining the tone rate in advance to the tone pulse width broadening of some de gree to offset the lag time to eliminate the zero dead zone.
(2) differential PWM control. The so-called differential PWM control, the basic principle is the jelpc  of the two switches at the same time given a certain time difference of control signals, the time difference in the implementation of the piston on both sides of the differential pressure can be controlled very small time difference, the resulting pressure waveform can be very narrow, thereby improving the linearity of the system of duty.-Δp (open rate - pressure) characteristic curve. The experiments show that this method can not only eliminate the dead zone phenomenon, but also improve the linearity of the characteristic curve.
(3) the development of high-performance, high-speed switchingpneumatic accessory . According to reports, West Germany, has developed in the laboratory at frequencies up to 2 00 Hz high-speed switching valve, a number of universities and manufacturers in Japan are being developed PZT piezoelectric element driven by ultra-high-speed switching valve. It is reported that the frequency up to 2 kHz, but has not been batch-to-market.