Control device for automatic transmission gear system

Details Control device for automatic transmission gear system Control device for automatic transmission gear system

1990-09-25

1991-04-02

Diehl, Dwight

Machine element or mechanism

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

Preselected indexed position

188 111, B60K 4106

Patent

active

050038427

ABSTRACT:
In an automatic transmission gear system which selectively actuates a plurality of frictional elements by oil pressure such as clutches and brakes that are provided in the transmission gear system in order to obtain different gear ratios, one frictional element is disengaged concurrently with engaging of another frictional element for switching the gear ratio (speed change). At that time, it is important to adjust the timing for actuating the frictional elements depending on the conditions of the engine and the vehicle itself. The present invention relates to a control device for an automatic transmission gear system which assures smooth gear shifting at all times by adequately controlling the overlap of the torque capacities of the frictional elements.

REFERENCES:
patent: 3956947 (1976-05-01), Leising et al.
patent: 4082013 (1978-04-01), Dornfeld et al.
patent: 4106367 (1978-08-01), Bouvet et al.
patent: 4125038 (1978-11-01), Hiramatsu
patent: 4340133 (1982-07-01), Blersch
patent: 4354236 (1982-10-01), Miki et al.
patent: 4440279 (1984-04-01), Schreiner

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