Line pressure control system for continuously variable transmiss

Details Line pressure control system for continuously variable transmiss Line pressure control system for continuously variable transmiss

1998-07-10

1999-12-28

Marmor, Charles A

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477158, 477159, 477161, 474 12, 474 17, 474 18, F16H 900

Patent

active

060074523

ABSTRACT:
A control system for a CVT comprises a controller arranged to compute an engine revolution condition on the basis of an engine revolution speed indicative signal, to compute actual and estimated engine outputs on the basis of the engine revolution condition, to compute a rotational change condition of the drive system, to compute an actual input load change amount caused by the inertia by multiplying the actual rotational change condition detection value by a predetermined inertial constant, to compute an estimated input load change amount by multiplying the estimated rotational change condition detection value by a predetermined inertia coefficient, to select larger one of the actual input load change amount and the estimated input load change amount as the input load change amount for outputting a command signal, and to output the command signal to a line pressure duty valve on the basis of the engine output and the selected input load change amount so as to further accurately control a line pressure.

REFERENCES:
patent: 4819514 (1989-04-01), Yamamuro et al.
patent: 5157992 (1992-10-01), Hayashi et al.
patent: 5382205 (1995-01-01), Yogai et al.
patent: 5569114 (1996-10-01), Matsuda et al.
patent: 5697866 (1997-12-01), Okahara

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