Proportional solenoid valve control system

Details Proportional solenoid valve control system Proportional solenoid valve control system

1996-01-04

1999-06-29

Lee, Kevin

Valves and valve actuation

Electrically actuated valve

Having means to produce proportional flow

361152, H01F 718

Patent

active

059156678

ABSTRACT:
A proportional solenoid valve control system is applicable to hydraulic systems of heavy equipment, automatic transmission systems and furl injectors of vehicles. This system includes main circuitry which is composed of a switching element, a proportional solenoid valves, and a current detection resistor; and a control circuit which is composed of a current command detection circuit, a rectifier, an offset circuit, a current command adding and limiting circuit, an offset circuit, a current command adding and limiting circuit, a current detection circuit, an proportional integrator-controller, a pulse width modulation comparator, and an output circuit. In addition, the system, precisely controls the load currents flowing in the proportional solenoid valves according to the current commend.

REFERENCES:
patent: 4485424 (1984-11-01), Niwa et al.
patent: 4848101 (1989-07-01), Suzuki
patent: 5724223 (1998-03-01), Feuser et al.
New Options for Hydraulic System Control, Richard Beercheck, Mar. 22, 1984, pp. 77-81.
Proportional-Solenoid Valves, New Option for Hydraulic control, Denis L Royston, Feb. 24, 1983, pp. 69-72.

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