Hydraulic control system for an automatic transmission used in v

Details Hydraulic control system for an automatic transmission used in v Hydraulic control system for an automatic transmission used in v

1998-01-28

1999-11-16

Marmor, Charles A

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477138, 477154, F16H 6104, F16H 6126

Patent

active

059848332

ABSTRACT:
Disclosed is a hydraulic control system for an automatic transmission including a plurality of friction elements associated with respective transmission speeds. The hydraulic control system includes a hydraulic fluid source, a line pressure controller, a reducing pressure controller, a range controller, a shift controller, a hydraulic pressure controller, and a hydraulic pressure distributor. The hydraulic pressure distributor further includes a 3-4 shift valve, a 1-2 shift valve, a 2-3/4-3 shift valve, a 4-2 shift valve for realizing port conversion during a 4-2 skip-shifting process to selectively supply/exhaust the control pressure to/from at least one of the friction elements corresponding to the respective transmission speeds, a control switch valve for realizing port conversion to selectively supply/exhaust hydraulic pressure from the shift controller and the control pressure via the 1-2 shift valve to at least one of the friction elements corresponding to the respective transmission speeds, and a solenoid valve for controlling the control switch valve in accordance with a control signal from a transmission control unit.

REFERENCES:
patent: 5383820 (1995-01-01), Mori
patent: 5417627 (1995-05-01), Iizuka
patent: 5507706 (1996-04-01), Jang et al.
patent: 5611749 (1997-03-01), Jang et al.
patent: 5816950 (1998-10-01), Kamada et al.

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