Catalyst heating with exhaust back-pressure
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United States of America Patent
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Apr 18, 2017
Grant Date -
May 12, 2016
app pub date -
Jan 18, 2016
filing date -
Sep 10, 2012
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Abstract
Embodiments for controlling an exhaust back-pressure valve are provided. In one example, a method for operating an engine comprises closing an exhaust back-pressure valve in response to a component temperature, adjusting intake and/or exhaust valve operation in response to closing the exhaust back-pressure valve to reduce cylinder internal exhaust gas recirculation (EGR), and while the exhaust back-pressure valve is closing, indicating degradation of an exhaust back-pressure system if a designated engine operating parameter remains constant. In this way, degradation of the exhaust back-pressure system may be diagnosed while maintaining combustion stability.
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