Multi-stage non-sequential downshift control for an automatic transmission
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United States of America Patent
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Aug 28, 2012
Grant Date -
Jul 28, 2011
app pub date -
Jan 25, 2010
filing date -
Jan 25, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
An improved downshift control for an automatic transmission optimized for sequential shifting achieves a non-sequential fifth gear to third gear downshift by reducing the main pressure of the transmission hydraulic control system, allowing a offgoing clutch to slip, disengaging the offgoing clutch, using torque reduction to control engine speed, engaging the oncoming clutch, increasing the main pressure of the transmission hydraulic control system and using torque reduction to synchronize the transmission input speed with the third gear transmission output speed.
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