Automatic transmission control system for improving shift qualit

Details Automatic transmission control system for improving shift qualit Automatic transmission control system for improving shift qualit

1996-05-24

1998-06-09

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Clutch control

Condition responsive control

477 86, 477109, F16H 6100

Patent

active

057625816

ABSTRACT:
A hydraulic control system for an automatic transmission is disclosed which includes a feedback hydraulic control circuit and a hydraulic correcting circuit. The feedback hydraulic control circuit controls the hydraulic pressure supplied to frictional elements of the automatic transmission under feedback control during a shift operation for adjusting the speed of an input shaft or a rate of change in speed of the input shaft of the automatic transmission to agree with a target speed or a target rate. The hydraulic correcting circuit corrects an output of the feedback hydraulic control circuit so as to suppress vibrations of torque transmitted through a drive train of the automatic transmission caused by control of the hydraulic pressure carried out by the feedback hydraulic control circuit within a range of a resonance frequency of the drive train of the automatic transmission.

REFERENCES:
patent: 4822113 (1989-04-01), Amberg et al.
patent: 5060747 (1991-10-01), Eto
patent: 5190130 (1993-03-01), Thomas et al.
patent: 5534764 (1996-07-01), Masaki et al.
patent: 5577979 (1996-11-01), Iizuka
patent: 5627750 (1997-05-01), Kono et al.

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