Method for determining composition of petrol and ethanol mixture of internal combustion engine, involves determining composition of fuel mixture from ignition voltage at spark plug and/or from combustion duration of ignition spark

摘要

The method involves supplying fuel mixture to a cylinder of an internal combustion engine, and igniting the fuel mixture with ignition spark of a spark plug. The composition of the fuel mixture is determined from ignition voltage at the spark plug and/or from combustion duration of the ignition spark. An ignition angle, cylinder charging, lambda value, temperature and/or speed of the combustion engine and/or position of a charge movement device are considered as a working point parameter for determining the composition of the fuel mixture. An independent claim is also included for a device for determining composition of fuel mixture comprising a measuring unit for determining ignition voltage at a spark plug.