Gear shift control system of an automatic transmission

Details Gear shift control system of an automatic transmission Gear shift control system of an automatic transmission

1992-02-13

1993-08-17

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

3644241, B60K 4106

Patent

active

052358755

ABSTRACT:
A gear shift control system according to this invention includes a throttle opening sensor, a vehicle speed sensor and a controller for delivering a shift command signal to an automatic transmission. The controller is previously stored with shift lines, which divide the respective regions of gear-shift stages, on the basis of the throttle opening and the vehicle speed. The controller delivers the shift command signal to the transmission when any of the shift lines is crossed by a shift point which is defined by the throttle opening and the vehicle speed. Taking account of the changing rate of the throttle opening, the past throttle opening, and the acceleration of the vehicle, however, the controller calculates a decision value which is indicative of the running state of the vehicle, on the basis of the fuzzy theory. When the decision value exceeds a predetermined value, the controller corrects the shift lines depending on the running state.

REFERENCES:
patent: 4922424 (1990-05-01), Hiramatsu
patent: 5076116 (1991-12-01), Sasaki
patent: 5079972 (1992-01-01), Iizuka
patent: 5103398 (1992-04-01), Akiyama
patent: 5113721 (1992-05-01), Polly

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