Control system for automotive automatic power transmission with fail-safe operation in response to failure of throttle angle sensor
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United States of America Patent
Stats
-
Jun 2, 1992
Grant Date -
N/A
app pub date -
Dec 5, 1990
filing date -
Dec 6, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control system for an automatic power transmission for an automotive vehicle performs line pressure control, shift control, lock-up control, engine brake clutch control, and so forth, on the basis of preselected engine control, parameters including a throttle valve open angle monitored by a throttle angle sensor. The control system is designed to detect failure of the throttle angle sensor or abnormality of the output signal of the throttle angle sensor to perform in a fail-safe mode of operation. In the fail-safe mode of operation, respective ones of a plurality of mutually distinct back-up signals serve as replacement of the throttle angle sensor signal. Each of the back-up signals is adapted to one of line pressure control, shift control, lock-up control, and engine braking clutch control for maintaining acceptable drivability of the vehicle.
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