Electrohydraulic power shift transmission system

Details Electrohydraulic power shift transmission system Electrohydraulic power shift transmission system

1983-02-09

1985-04-30

Bonck, Rodney H.

192 clutches and power-stop control

Transmission control and clutch control

Common control

192 489, 192 8714, 91529, 91530, F16D 2510, F16D 2511

Patent

active

045138508

ABSTRACT:
An electrohydraulic control system for a pair of hydraulically actuated vehicle transmission clutches operable to effect high and low speed ranges. High and low hydraulic clutch valves are pilot operated by a solenoid valve which delivers pressurized fluid to pressure chambers associated with the flow control elements of the clutch valves. The solenoid valve is controlled by a circuit which includes a relay operated switch, a manually operated switch controlling the relay operated switch and a clutch pedal operated switch in series with the manually operated switch. The relay operated switch opens when the clutch pedal is operated thereby causing the transmission to be in a low speed condition when inching the vehicle.

REFERENCES:
patent: 3382769 (1968-05-01), Raider
patent: 3808810 (1974-05-01), Schott et al.
patent: 4376473 (1983-03-01), Tomasek et al.
patent: 4380278 (1983-04-01), Lasken
patent: 4416358 (1983-11-01), Kapp

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