Transmission engagement override valve

Details Transmission engagement override valve Transmission engagement override valve

1992-11-02

1993-11-16

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

91426, 13762565, 192 8713, F15B 13043, F15B 13044

Patent

active

052614565

ABSTRACT:
A transmission control system includes a plurality of hydraulic pressure operated control elements for engaging a gear of the transmission in response to actuation of a shift control lever having neutral and non-neutral positions, a plurality of control valves for controlling pressurization of the control elements and a pump for supplying pressurized fluid to the control valves. An engagement override system includes a switch which is coupled to the shift lever and which energizes a solenoid when the shift lever is in its neutral position and de-energizes the solenoid when the shift lever is in its non-neutral position. In a preferred embodiment, an engagement override valve includes a pilot operated valve which controls communication between the pump, a reservoir and the pressure operated control elements. The solenoid controls the pilot operated valve. The valve also includes a pilot chamber which is pressurized to move the valve to and hold the valve in a position wherein the pump is communicated with the pressure operated control elements.

REFERENCES:
patent: 3468194 (1969-09-01), Horsch et al.
patent: 3640146 (1972-02-01), Barnes
patent: 3709065 (1973-01-01), Starling
patent: 3805837 (1974-04-01), Stampfli
patent: 3863523 (1975-02-01), Starling et al.
patent: 4111071 (1978-09-01), Pearce et al.
patent: 4396099 (1983-08-01), Shirley

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