Electrical assistance for S.I. engine idle speed control

摘要

An original method for improving spark-ignition engine idling conditions, is presented. The proposed solution has the distinctive feature of simultaneously combining the traditional airflow rate control and the usual automobile alternator operating as a synchronous motor in order to provide a fast supplementary torque. Experimental validation of the electric assistance system is carried out on a production engine, and the new method is compared with the standard one in terms of idle stability, fuel consumption and pollution emissions