Control system for an automatic transmission for a vehicle
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United States of America Patent
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-
Oct 15, 1985
Grant Date -
N/A
app pub date -
Dec 1, 1983
filing date -
Dec 1, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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