Method for controlling vibrations during transitions in a variable displacement engine
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United States of America Patent
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Jan 23, 2018
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app pub date -
Oct 13, 2014
filing date -
Oct 13, 2014
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Abstract
Methods and systems are provided for controlling vibrations during transitions between engine operating modes in a four-cylinder engine. One method includes timing a transition in engine operation between two-cylinder, three-cylinder, and four-cylinder modes with a sequence of firing events such that successive firing events are separated by at least 120 crank angle degree intervals. Vibrations resulting from transitions may be countered by adjusting active mounts, the active mounts being adjusted in synchronization with a valvetrain switching solenoid.
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