Variable valve timing for cylinder deactivation
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United States of America Patent
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Apr 7, 2015
Grant Date -
Jan 30, 2014
app pub date -
Jul 24, 2012
filing date -
Jul 24, 2012
priority date (Note) -
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Abstract
Methods and systems are provided for adjusting cylinder valve timings to enable a group of cylinders to operate and combust while another group of cylinders on a second are selectively deactivated. Valve timing may be adjusted to allow flow of air through the inactive cylinders to be reduced, lowering catalyst regeneration requirements upon reactivation. The valve timing may alternatively be adjusted to enable exhaust gas to be recirculated to the active cylinders via the inactive cylinders, providing cooled EGR benefits.
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