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

1998-02-13

1999-11-16

Marmor, Charles A

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

F16H 6126

Patent

active

059848324

ABSTRACT:
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, wherein the hydraulic pressure distributor includes a 3-4 shift valve, a 2-3/4-3 shift valve, a 1-2 shift valve, a control switch valve for selectively supplying/exhausting hydraulic pressure from the shift controller to at least one of the friction elements corresponding to the respective transmission speeds to control operating timing of each corresponding friction element and supplying the hydraulic pressure from the shift controller to the line pressure controller to reduce line pressure at a high speed state; and a solenoid valve for controlling the control switch valve in accordance with a control signal of the transmission control unit.

REFERENCES:
patent: 5536216 (1996-07-01), Jang
patent: 5540634 (1996-07-01), Jang et al.
patent: 5590751 (1997-01-01), Jang et al.
patent: 5611749 (1997-03-01), Jang et al.
patent: 5643123 (1997-07-01), Jang et al.
patent: 5658218 (1997-08-01), Jang et al.

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