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Automatic Control of Cylinder by Cylinder Air-Fuel Mixture Using a Proportional Exhaust Gas Sensor
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Abstract
Cylinder to cylinder air-fuel imbalance in an engine due to geometrical factors and component tolerances may be overcome by a system capable of individually controlling the air-fuel ratio for each cylinder. A stable feedback controller for individual cylinder air-fuel ratio was designed using dynamic models of the gas transport process and the proportional exhaust gas sensor (UEGO). The controller was tested using a proportional exhaust gas sensor located in each bank of a V6 engine. Preliminary test results indicate that automatic balancing of the air-fuel ratio to each cylinder can reduce carbon monoxide emissions compared to a feedback system controlling overall air-fuel ratio.
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Bush, K., Adams, N., Dua, S., and Markyvech, C., "Automatic Control of Cylinder by Cylinder Air-Fuel Mixture Using a Proportional Exhaust Gas Sensor," SAE Technical Paper 940149, 1994, https://doi.org/10.4271/940149.Also In
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