Variable displacement engine control system and method
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United States of America Patent
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Jan 30, 2018
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app pub date -
Jul 5, 2017
filing date -
Aug 15, 2013
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Abstract
Methods and systems are provided for improving the performance of a variable displacement engine. Split injection and spark retard may be used in active cylinders during a VDE mode to heat an exhaust catalyst and extend the duration of VDE mode operation. Split injection and spark retard may also be used in reactivated cylinders at a time of cylinder reactivation to improve restart combustion stability.
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