Device for controlling an automatic gearbox
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United States of America Patent
Stats
-
Sep 30, 2003
Grant Date -
N/A
app pub date -
May 3, 2001
filing date -
Nov 6, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The device for controlling a CVT transmission which is connected with a pendulous drive, especially an internal combustion engine for a motor vehicle having front-transverse drive, has a hydromotor simultaneously used as sensor and actuator, the output signal of which is a function of the size and of the dynamics of the engine torque, the same as an electrohydraulic control unit which controls the actuating areas of the primary and secondary pulleys of the CVT via electromagnetic actuating elements and hydraulic valves. In addition to pressure-regulating valves, pressure-reducing valves and at least one emergency valve, the device has a coupling of the hydromotor with the second pressure-reducing valve via a line which coupling is used for torque modulated control of the second pressure-reducing valve in an emergency operating mode.
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