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A Novel Strategy for Fast Catalyst Light-Off without the Use of an Air Pump
Technical Paper
2007-01-0044
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A novel engine management strategy for achieving fast catalyst light-off without the use of an exhaust air pump in a port-fuel-injected, spark ignition engine was developed. A conventional 4-cylinder engine was operated with three cylinders running rich and the fourth one as an air pump to supply air to the exhaust manifold. Under steady-state cold coolant conditions, this strategy achieved near total oxidation of CO and HC with sufficiently retarded spark timing, resulting in a 400% increase in feedgas enthalpy flow and a 90% reduction in feedgas HC emissions compared to conventional operation. The strategy was also evaluated for crank starts. Using the existing engine hardware, implementing the strategy resulted in a reduction in catalyst light-off time from 28.0 seconds under conventional operation to 9.1 seconds.
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Citation
Lang, K. and Cheng, W., "A Novel Strategy for Fast Catalyst Light-Off without the Use of an Air Pump," SAE Technical Paper 2007-01-0044, 2007, https://doi.org/10.4271/2007-01-0044.Also In
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