Shift control system for an automatic transmission

Details Shift control system for an automatic transmission Shift control system for an automatic transmission

1990-04-06

1991-06-18

Diehl, Dwight

Machine element or mechanism

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

Preselected indexed position

B60K 4106

Patent

active

050241257

ABSTRACT:
A shift control system for the vehicle contains a torqueconverter, a multiple stage gear mechanism adapted for a shift of an operating state of a friction coupling means of a hydraulic pressure type which is coupled to the torque converter, a temperature sensor for sensing temperatures of the operating oil for the torque converter and the friction coupling element, and a control unit for shift control. The control unit controls operation of the friction coupling elements on the basis of a predetermined shift characteristic and shifts the shift characteristic, when the temperature of the operating oil to be sensed by the temperature sensor is lower than a given value, is in such a manner that the area of driving at least for first speed stage is narrowed.

REFERENCES:
patent: 4262335 (1981-04-01), Ahlen et al.
patent: 4524645 (1985-06-01), Tatsami
patent: 4790215 (1988-12-01), Hamano
patent: 4823267 (1989-04-01), Kumara
patent: 4947330 (1990-08-01), Hiramatsu
patent: 4958492 (1990-09-01), Maki et al.

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