Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1994-11-18
1996-09-17
Marmor, Charles A.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477130, 477143, F16H 6126
Patent
active
055563562
ABSTRACT:
A hydraulic control system for an automatic transmission of automotive vehicles is provided. The hydraulic control system includes a pressure source, a plurality of solenoid valves, and a plurality of directional control valves. Each solenoid valve selectively supplies and release hydraulic pressure to and from one of frictional element of a power train of the automatic transmission according to a given schedule of transmission operation for establishing a given gear ratio. The directional control valves are interposed between the frictional elements of the power train and the solenoid valves, respectively. Each of the directional control valves is responsive to input of the hydraulic pressure supplied from the pressure source through a preselected hydraulic line to assume first and second valve positions, the first valve position being to allow the hydraulic pressure to be directed to one of the frictional elements, the second valve position being to release the hydraulic pressure acting on one of the frictional element. Additionally, the hydraulic pressure to activate the frictional elements is reduced in pressure level temporarily upon supply thereto for absorbing mechanical shock caused by engagement of the frictional elements.
REFERENCES:
patent: 5010786 (1991-04-01), Hiramatsu et al.
patent: 5024125 (1991-06-01), Baba
patent: 5042328 (1991-08-01), Morishige et al.
patent: 5085103 (1992-02-01), Ando et al.
Ando Yoriaki
Hakamada Naoki
Inagaki Mitsuo
Kubo Kunihiro
Estremsky Sherry Lynn
Marmor Charles A.
Nippon Soken Inc.
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