Control system for automatic transmission

Details Control system for automatic transmission Control system for automatic transmission

1996-05-10

1998-08-04

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477117, F16H 6120

Patent

active

057886032

ABSTRACT:
A control system for an automatic transmission operates a clutch in a speed change unit to disconnect a transmission mechanism from a fluid transmission unit during a neutral operating state while the vehicle in a forward gear is held stopped by braking with the throttle fully closed. Reengagement of the clutch such as by depression of accelerator pedal (throttle open), release of the brake pedal, etc., is produced by a gradual increase in oil pressure to the servo operating the clutch to prevent clutch application shock. Wear on the clutch is reduced by abrupt increase of the oil pressure in response to satisfaction of a clutch engagement completion condition based upon input RPM, output RPM and the gear ratio of the target gear. In one embodiment, this abrupt increase occurs immediately after satisfaction of the clutch engagement completion condition when the throttle is open but occurs after elapse of a set time period from satisfaction of the clutch engagement completion condition when the throttle is closed. In a second embodiment when the throttle is closed, an application standby condition based on the input RPM, the output RPM and the gear ratio indicating backward vehicle movement is determined after the clutch engagement completion condition is satisfied. If backward movement is indicated, the abrupt increase in oil pressure is made after a set time period, otherwise the abrupt increase occurs immediately. In a third embodiment, a second clutch engagement completion condition requirement is substituted for the delay of the set time period of the second embodiment to prevent application shock during the clutch engagement.

REFERENCES:
patent: 4718525 (1988-01-01), Yamaguchi et al.
patent: 4846909 (1989-07-01), Hasegawa et al.
patent: 5249483 (1993-10-01), Iizuka
patent: 5385511 (1995-01-01), Iizuka
patent: 5558599 (1996-09-01), Tsukamoto et al.
patent: 5655993 (1997-08-01), Fujimoto et al.

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