Method of operating a PWM solenoid valve

Details Method of operating a PWM solenoid valve Method of operating a PWM solenoid valve

1986-10-17

1988-08-30

Rosenthal, Arnold

Fluid handling

Processes

25112905, 25112908, 91459, 13762565, F16K 3106

Patent

active

047669217

ABSTRACT:
The invention provides an improved method of operating a pulse-width-modulated solenoid valve so as to improve the proportionality of the flow-to-command pulse width characteristics of the valve. A train of command pulses (P.sub.1, P.sub.2, . . . P.sub.n), having widths corresponding to the desired flow through the valve, is superimposed on another train of pre-pulses (p.sub.1, p.sub.2, . . . p.sub.n). Each pre-pulse is timed to appear immediately ahead of an associated command pulse so that their widths will be effectively summed. The pre-pulses have widths necessary to substantially eliminate the "deadzone" in the flow-to-pulse width characteristics of the valve. Hence, the proportionality of the flow-to-command pulse width characteristics of the valve will be substantially improved.

REFERENCES:
patent: 4103695 (1978-08-01), Aono
patent: 4192551 (1980-03-01), Weimer et al.
patent: 4345737 (1982-08-01), Kawai et al.
patent: 4361164 (1982-11-01), Sakakibara et al.
patent: 4466337 (1984-08-01), Eiler
patent: 4638837 (1987-01-01), Buike et al.
patent: 4651535 (1987-03-01), Alsenz

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