Hydraulic controlling system for lockup clutches
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United States of America Patent
Stats
-
Nov 14, 1989
Grant Date -
N/A
app pub date -
Jun 11, 1987
filing date -
Jun 11, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lockup control valve is provided to control the discharge from the lockup clutch during clutch engagement and a solenoid valve to supply the control pressure to the lockup control valve. The aforesaid lockup control valve has a face on which the oil supply pressure acts during lockup clutch engagement, an opposing face of equal area on which the lockup clutch discharge pressure acts, a face on which the supply pressure from the aforesaid solenoid valve acts, and an opposing face on which a constant pressure acts. The hydraulic controlling system controls the discharge pressure of the lockup clutch during lockup clutch engagement according to the control pressure from the solenoid valve. This maintains a constant relationship between the solenoid pressure and the lockup clutch capacity (pressure difference) and permits precise slip control even if the oil pressure supplied to the lockup clutch fluctuates.
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