System and method for determining engine pull-up threshold
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United States of America Patent
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Feb 26, 2019
Grant Date -
Jan 11, 2018
app pub date -
Jul 5, 2016
filing date -
Jul 5, 2016
priority date (Note) -
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Abstract
A system and method for modifying the engine pull-up (EPU) logic within a hybrid vehicle based on max motor torque that accounts for the drop or change in available motor torque due to the opening/slipping of a torque converter bypass clutch during engine starts is disclosed. An engine pull-up threshold is determined from max available motor torque at a virtual impeller speed, where the virtual impeller speed is the impeller speed that would result if the torque converter bypass clutch was open/slipping and transferring the same amount of torque.
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