Variations in air-fuel ratio within a 16-valve port-injection spark-ignition engine have been examined as a consequence of rapid transients in load at constant speed with fuel injection controlled by the production engine-management system and by a custom-built controller. The purpose was to minimize excursions from stoichiometry by the use of a controller to impose an injection strategy, guided by results obtained with the production management system. The strategy involves a model that takes account of manifold filling and the delays in transport of fuel from the injectors to the cylinder. The results show that the excursions in air-fuel ratio from stoichiometry were reduced from more than 25% to 6%.
Control of A/F Ratio During Engine Transients
Sae Technical Papers
International Fuels & Lubricants Meeting & Exposition ; 1999
1999-05-03
Aufsatz (Konferenz)
Englisch
Control of air/fuel ratio during engine transients
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