An electronic engine management system has been developed to control both ignition timing and air-fuel (A/F) ratio to maximize fuel economy. Both controls employ feedback techniques and are therefore intrinsically adaptable to a wide variety of models, as required for a universal retrofit market. The ignition control loop monitors the position of the combustion pressure peak while the mixture control loop senses the lean limit as defined by a roughness threshold. Test results demonstrate fuel economy and transient operation. A brief background to the New Zealand energy conservation program is in included as background to the system’s specification.
Retrofit Feedback Control of A/F Ratio and Ignition Timing for Fuel Economy
Sae Technical Papers
SAE International Congress and Exposition ; 1982
1982-02-01
Conference paper
English
Retrofit feedback control of A/F ratio and ignition timing for fuel economy
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