Lock up control of a hydraulic torque converter type automatic transmission
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United States of America Patent
Stats
-
Aug 18, 1987
Grant Date -
N/A
app pub date -
Mar 22, 1984
filing date -
Mar 24, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vehicle automatic transmission including a torque converter having a lock up clutch. A lock up control circuit is provided and has a memory including a first lock up control line for controlling the engagement and release of the lock up clutch when the torque converter turbine speed is close to the pump impeller speed, and a second lock up control line which is drawn along a line wherein the engine output torque is substantially zero so that the lock up clutch is released at a given engine load when the turbine speed is decreased beyond the first lock up control line, or when the turbine speed is increased beyond the second lock up control line.
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