Control system for an automatic transmission for a vehicle

Details Control system for an automatic transmission for a vehicle Control system for an automatic transmission for a vehicle

1983-12-01

1985-10-15

Leppink, James A.

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Speed responsive

474 28, 74867, F16H 1106

Patent

active

045471789

ABSTRACT:
A control system for a belt drive continuously-variable speed automatic transmission (CVT) for a vehicle wherein the discharge speed of a working fluid from a hydraulic servomotor provided on an input pulley of CVT is restricted by a downshift control mechanism to prevent a slip produced at the time of kickdown. The downshift control mechanism comprises a downshift controlling solenoid valve, a reduction ratio control mechanism and an electric control circuit for controlling these elements, wherein at the time of the kickdown, the solenoid valve is deenergized to close a drain port for the hydraulic servomotor of the reduction ratio control mechanism, and at the time of the coastdown, the solenoid valve is energized to open the drain port for the hydraulic servomotor of the reduction ratio control mechanism.

REFERENCES:
patent: 3451283 (1969-06-01), Rattunde
patent: 4152947 (1979-05-01), van Deursen et al.
patent: 4228691 (1980-10-01), Smirl
patent: 4459879 (1984-07-01), Miki et al.
patent: 4475416 (1984-10-01), Underwood

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