Tie-up decision device for automatic transmission, and gearshift

Details Tie-up decision device for automatic transmission, and gearshift Tie-up decision device for automatic transmission, and gearshift

1999-01-11

2000-08-22

Marmor, Charles A

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477154, 477156, F16H 6104

Patent

active

061064351

ABSTRACT:
In executing a clutch-to-clutch gearshift based on the release and engagement of two clutches by the control of the hydraulic pressures of the clutches, the fluctuating magnitude of the output shaft r.p.m. (No in FIG. 2) of the automatic transmission is calculated, and the degree of the drag (tie-up) state of the clutches is detected on the basis of the calculated fluctuating magnitude. As a result, the pressure increasing/decreasing timings of the hydraulic pressures of the clutches can be optimized to realize a feedback control or learning control of higher precision.

REFERENCES:
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patent: 3747439 (1973-07-01), Uozumi et al.
patent: 3832915 (1974-09-01), Hiramatsu
patent: 4073204 (1978-02-01), Dick
patent: 4653351 (1987-03-01), Downs et al.
patent: 5119695 (1992-06-01), Milunas et al.
patent: 5472389 (1995-12-01), Ando et al.
patent: 5583768 (1996-12-01), Hamajima et al.
patent: 5669849 (1997-09-01), Tabata et al.
patent: 5931885 (1999-08-01), Kubo et al.

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