Control apparatus for stepless transmission for vehicles

Details Control apparatus for stepless transmission for vehicles Control apparatus for stepless transmission for vehicles

1992-06-26

1994-06-14

Braun, Leslie A.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

3644241, B60K 4116

Patent

active

053199995

ABSTRACT:
A control apparatus for controlling a stepless transmission which changes the effective diameter between a primary pulley and a secondary pulley by cyclically controlling a change rate toward a target value to be set in advance based upon the characteristic set in advance. The apparatus detects the throttle opening degree TVO, a RANGE signal, the revolutional frequency of the secondary pulley Ns and the like, and detects whether the vehicle is in a transitional status of an acceleration operation or a deceleration operation. At a point in time during the transitional period, the apparatus sets a first target value based upon the signals such as the TVO signal, the RANGE signal and the Ns signal, and sets a second target value based upon the difference between the first target value set in the current control cycle and the second target value set in the previous control cycle, at the same time, sets a change in the second target value to be smaller than that in the first target value. The change rate is controlled toward this second target value.

REFERENCES:
patent: 4853858 (1989-08-01), Kumura
patent: 4872115 (1989-10-01), Itoh et al.
patent: 5062049 (1991-10-01), Taylor
patent: 5062050 (1991-10-01), Petzold et al.
patent: 5092198 (1992-03-01), Morishige et al.
patent: 5144864 (1992-09-01), Sawasaki et al.
patent: 5156572 (1992-10-01), Morishige

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