Line pressure control system for automatic transmission

Details Line pressure control system for automatic transmission Line pressure control system for automatic transmission

1989-10-27

1992-02-11

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, B60K 4106

Patent

active

050866680

ABSTRACT:
A hydraulic pressure control system for an automatic transmission includes a torque converter, a multiple transmission gear mechanism having a plurality of gear stages and frictional elements for switching power transmitting paths in the transmission gear mechanism, a hydraulic control mechanism for controlling engagement and disengagement of the frictional elements to establish one of the gear stages, and a line pressure control device for controlling line pressure of the hydraulic control mechanism in accordance with a vehicle operating condition. An engine torque detecting device detects an engine output torque, and a turbine speed detecting device detects a turbine speed of the torque converter. A shift condition detecting device detects a shift-up operation and a shift-down operation in the transmission, and the line pressure control device controls the line pressure in accordance with the engine torque in the shift-up operation and the turbine speed in the shift-down operation. A precise line pressure control can be accomplished for obviating torque shock at the time of the shift operation in the automatic transmission.

REFERENCES:
patent: 4779489 (1988-10-01), Haley
patent: 4791568 (1988-12-01), Hiramatsu et al.
patent: 4807132 (1989-02-01), Arai et al.
patent: 4845618 (1989-07-01), Narita
patent: 4870581 (1989-09-01), Ito et al.
patent: 4898049 (1990-02-01), Niikura
patent: 4919012 (1990-04-01), Bolz
patent: 4922424 (1990-05-01), Hiramatsu

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