Oil pressure control system having an ON/OFF solenoid and a lowe

Details Oil pressure control system having an ON/OFF solenoid and a lowe Oil pressure control system having an ON/OFF solenoid and a lowe

1997-05-23

1998-10-06

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477121, 477131, 25112908, F16M 6100

Patent

active

058169776

ABSTRACT:
An oil pressure control system for an automatic transmission for controlling the oil pressure of a frictional engagement element by a regulator valve for outputting an oil pressure according to a signal pressure inputted. The oil pressure control system comprises: a first solenoid valve for outputting a signal pressure varying with an electric signal; and a second solenoid valve having a coil of a higher resistance than that of the first solenoid valve and for applying, when activated, a signal pressure in the same direction as the signal pressure of the first solenoid valve to the regulator valve. As a result, it is possible to accurately control the oil pressure at the transient time of a speed change of the frictional engagement element of the automatic transmission and to prevent the controlling solenoid valves from being damaged.

REFERENCES:
patent: 5514047 (1996-05-01), Tibbles et al.
patent: 5621604 (1997-04-01), Carlson

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