Hydraulic control system for an automatic transmission

Details Hydraulic control system for an automatic transmission Hydraulic control system for an automatic transmission

1997-11-19

1999-11-09

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477120, 475158, F16H 5708, F16H 5948, F16H 6126

Patent

active

059804254

ABSTRACT:
Disclosed is a hydraulic control system for an automatic transmission which includes a line pressure controller for regulating hydraulic pressure generated by a hydraulic pump to line pressure, a damper clutch controller for actuating a damper clutch of the torque converter, a reducing pressure controller for reducing line pressure, a range controller for selectively supplying line pressure to lines corresponding to respective shift ranges, a shift controller for supplying hydraulic pressure from the range controller to lines corresponding to respective shift ranges, a hydraulic pressure controller for converting hydraulic pressure from the range controller to operational pressure operating the friction element, and a hydraulic pressure distributor for determining a hydraulic flow path corresponding to each shift range by operating valves according to the hydraulic pressure from the shift controller, and suitably distributing the operational pressure to each friction element, wherein the shift controller further includes an additional shift control valve easily controlling timing of pressure supply and reducing a change in hydraulic pressure levels.

REFERENCES:
patent: 5542888 (1996-08-01), Takada et al.
patent: 5643123 (1997-07-01), Jang et al.

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