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Means of Improving Engine Parameters Through Coordinated Control of the Air-Fuel Mixture and Ignition
Published January 01, 1980 by Verlag Des Verein Deutscher Ingenieure GmbH in Germany
Each operating point of an engine is defined by volume of intake air and engine rpm. The graph of these two variables incorporates all the different engine operating ranges; the paper analyzes each of these ranges and demonstrates how interrelated control of engine parameters through digital electronics can improve performance.
All engine ranges (idling, partial-loading, etc.) are discussed twice. The first treatment describes the significance of a particular operating range on engine performance and indicates the parameter changes necessary to operate in preferred performance ranges. The second discussion translates these changes into appropriate fuel and ignition adjustments and points out the deficiencies in conventional engine responses. Transient responses are also analyzed in this manner.
Finally, to permit continuous operation in preferred engine ranges, a micro-electronic system for fuel and ignition control is described. Results of comparison tests with other control systems show improvements in fuel consumption, exhaust emissions, performance, and other areas.