Control system for a continuously variable transmission for vehi

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

1981-03-26

1984-09-04

Gruber, Felix D.

Boots, shoes, and leggings

74866, 474 12, 474 18, F16H 566, F16H 918, F16H 1106

Patent

active

044701179

ABSTRACT:
A control system for continuously variable transmission for vehicles is provided with an electric circuit receiving input signals of vehicle running conditions and a hydraulic control circuit. The hydraulic control circuit comprises a reduction ratio control device controlled by the electric control circuit and regulating the hydraulic pressure supplied to the hydraulic servo system of the input pulley and changing the reduction ratio between the input and output shafts of a V-belt type continuously variable transmission, and a shift control mechanism controlled by the electric control circuit and regulating the rise time of hydraulic pressure supplied to the hydraulic servo system of friction engaging elements connected to a planetary gear set changing forward and reverse drives. The control system permits the automatic transmission to perform under desirable running conditions such as optimum fuel economy, and it generates of the hydraulic fluid pressure required in any portion of the automatic transmission during working and eliminates shock of the shifting operation.

REFERENCES:
patent: 3918312 (1975-11-01), Espenschied et al.
patent: 4091690 (1978-05-01), Miyao
patent: 4106367 (1978-08-01), Bouvet
patent: 4107776 (1978-08-01), Beale
patent: 4241618 (1980-12-01), Smirl
patent: 4291594 (1981-09-01), Baudoin

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