Line pressure control at cranking and subsequent warming-up oper

Details Line pressure control at cranking and subsequent warming-up oper Line pressure control at cranking and subsequent warming-up oper

1991-07-11

1992-05-26

Wright, Dirk

Machine element or mechanism

Rotary driven device adjustable during operation relative to...

Screw and nut adjusting means

F16H 5972, F16H 5978

Patent

active

051156946

ABSTRACT:
A hydraulic pressure, i.e., a line pressure, of a hydraulic fluid supplied from an engine driven pump toward a hydraulically actuable coupling of an automatic transmission is held at the maximum pressure value when a temperature of an automatic transmission oil is less than a predetermined temperature value. However, the hydraulic pressure is temporarily decreased from the maximum pressure value to the minimum pressure value for a period of time after cranking of the engine when the transmission oil temperature is lower than the predetermined temperature value. Owing to a decreased load on the engine by the oil pump, smooth cranking and subsequent warming-up operation of the engine is assured under cold whether condition when the automatic transmission oil temperature is lower than the predetermined temperature value.

REFERENCES:
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 4779489 (1988-10-01), Haley
patent: 4807495 (1989-02-01), Wallace
patent: 4807496 (1989-02-01), Hayasaki et al.
patent: 4894780 (1990-01-01), Simonyi et al.
Service Manual, "Nissan Full Range Electronically Controlled Automatic Transmission RE4R01A Type", Mar. 1987.

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