Circuit for controlling a hydraulic pressure of an automatic tra

Details Circuit for controlling a hydraulic pressure of an automatic tra Circuit for controlling a hydraulic pressure of an automatic tra

1996-11-05

1999-05-11

Wright, Dirk

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475116, 475120, F16H5/64

Patent

active

059022043

ABSTRACT:
A circuit for controlling hydraulic pressure of an automatic transmission includes a first shift device, a second shift device and a third shift device which make line pressure lead-through by selecting the predetermined combination of supply and exhaust of hydraulic pressure in accordance with the transmission stage in order to set the transmission stage of the automatic transmission in response to the driving condition of the vehicle. A switching device detects that a hydraulic pressure is supplied to an output line of the first shift device or an output line of the third shift device so that the third-speed and the fourth-speed are switched. The switching device also detects that the hydraulic pressure is supplied to an output line of the second shift device and an output line of the third shift device so as to shut out a line which is conducted to one of engaging elements being engaged at each time of the first-speed and the third-speed. By switching the combination of the supply and exhaust of hydraulic pressure, among devices which set each of the transmission stages, the number of parts and the required space can be reduced by shutting out the switching valves of line pressure.

REFERENCES:
patent: 3754482 (1973-08-01), Sanders et al.
patent: 4538482 (1985-09-01), Hiramatsu
patent: 4754403 (1988-06-01), Hiramatsu
patent: 5154100 (1992-10-01), Yamada et al.
patent: 5311795 (1994-05-01), Yoshimura et al.
patent: 5411446 (1995-05-01), Hirose
patent: 5582559 (1996-12-01), Jang et al.
patent: 5634865 (1997-06-01), Jang

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