Method for controlling a transmission during acceleration from idle
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United States of America Patent
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-
Oct 18, 2011
Grant Date -
Nov 12, 2009
app pub date -
Oct 23, 2008
filing date -
May 12, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A method for controlling a transmission in a motor vehicle during acceleration from an idle condition begins when the vehicle is stationary, the engine is at idle, and the transmission is in the first gear range or ratio. When the vehicle begins to accelerate, the method includes the steps of monitoring the rate of vehicle acceleration and comparing the rate of vehicle acceleration to a rate of vehicle acceleration threshold. If the rate of vehicle acceleration is less than the acceleration threshold, then the transmission allows one of the currently engaged clutches to slip. This clutch slip reduces the torque load on the engine. The method then monitors the engine output speed. If the engine output speed exceeds an engine output speed threshold, then the clutch is fully applied.
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