Control system for a continuously variable transmission capable

Details Control system for a continuously variable transmission capable Control system for a continuously variable transmission capable

1996-11-05

1999-09-07

Graysay, Tamara L.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477 46, 477 48, F16H 6100

Patent

active

059478616

ABSTRACT:
A continuously variable transmission control system employs a gear ratio control map which has a step-wise control zone of driving condition where engine speed is controlled to repeat alternate gradual increase and rapid decrease with an increase in vehicle speed so as thereby to vary step-wise a gear ratio and a continuous control zone of driving conditions where engine speed is controlled to increase approximately linearly with an increase in vehicle speed so as thereby to continuously vary a gear ratio, the step-wise control zone of driving condition based on which the gear ratio control is performed being narrowed when a driving condition is judged to be within a specified unstable zone.

REFERENCES:
patent: 4653005 (1987-03-01), Osanai et al.
patent: 4836056 (1989-06-01), Nakawaki et al.
patent: 5609544 (1997-03-01), Lardy et al.
patent: 5624348 (1997-04-01), Lardy et al.

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