Proportional-flow electrohydraulic control

Details Proportional-flow electrohydraulic control Proportional-flow electrohydraulic control

1983-11-21

1985-04-16

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

137101, 137501, G05D 1112, G05D 1620

Patent

active

045109630

ABSTRACT:
The present invention provides a proportional-flow electrohydraulic control which includes both an electrohydraulic valve (36) and an electronic control (382). The electronic control includes an offsetting circuit (622) and is effective to produce an effective driving voltage, for an electrical force-motor (52) of the electrohydraulic valve, that is pulse-width modulated and that is greater than a fixed proportionality to an input signal (410) by a manually adjustable offset voltage. The offset voltage may be adjusted to provide a null force that exactly balances a spring (129) which presses a valve spool (54) to an overlapped position; so that fluid flow is proportional to an input signal irrespective of the initial load of the spring. Or, the offset voltage may be adjusted to provide a basic flow voltage; and then the rate of fluid flow that is delivered by the valve is greater than a given proportionality to the input signal by a substantially constant rate of fluid flow.

REFERENCES:
patent: 2445544 (1948-07-01), Trautman
patent: 3596677 (1971-08-01), Clark
patent: 3724485 (1973-04-01), Cox
patent: 3874407 (1975-04-01), Griswold

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