FUEL-FIRED BURNER FOR NO2 BASED REGENERATION
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United States of America Patent
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Issued Date -
Mar 29, 2012
app pub date -
Sep 29, 2010
filing date -
Sep 29, 2010
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Abandoned
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Abstract
A fuel-fired burner in a vehicle exhaust system is selectively activated to increase exhaust gas temperature to a desired reference temperature. The fuel-fired burner can be either a partial range burner or a full range burner. A control strategy activates the fuel-fired burner only when needed to provide NO2 based passive regeneration of a diesel particulate filter in a fuel efficient manner. The control strategy includes at least one of a look-up table which outputs the desired reference temperature as a function of engine operating conditions, a comparison of pressure characteristics to predetermined thresholds, and a steady-state model or a transient model that outputs the desired reference temperature as a function of exhaust back-pressure and estimated exhaust oxygen flowrate.
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