System for dithering solenoids of hydraulically operated valves

Details System for dithering solenoids of hydraulically operated valves System for dithering solenoids of hydraulically operated valves

1995-05-23

1996-06-04

Kamen, Noah P.

Internal-combustion engines

Cooling

Interrelated coolant flow and throttle control

F01P 714

Patent

active

055223508

ABSTRACT:
A system for controlling the flow of hydraulic fluid in lines leading to and from a solenoid injector which actuates a temperature control valve. The solenoid injector controls the actuation a temperature control valve between a first state for inhibiting flow of temperature control fluid and a second state for allowing flow of a temperature control fluid. The solenoid injector receives a flow of pressurized hydraulic fluid along the hydraulic line from a fluid reservoir. In order to drain the hydraulic fluid from the hydraulic line after engine shut-off, the hydraulic line is dithered in accordance with a predetermined schedule. An engine computer determines when the engine has been shut-off. After determining that the engine has been shut-off, the engine computer sends signals to the solenoid injector causing it to actuate between its open and closed positions in accordance with a predetermined schedule.

REFERENCES:
patent: Re30115 (1979-10-01), Herd et al.
patent: 2650609 (1953-09-01), Herbst
patent: 2799466 (1957-07-01), Hickerson
patent: 3621907 (1971-11-01), Ephraim, Jr. et al.
patent: 4357912 (1982-11-01), Brown
patent: 4413595 (1983-11-01), Potts, Jr.
patent: 4484541 (1984-11-01), Yokoyama
patent: 4982902 (1991-01-01), Knapp et al.
Hydraulic Handbook, dated Jan. 30, 1958, p. 502.

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