DETECTING IONIZATION SIGNAL FOR HCCI ENGINES USING A DUAL GAIN AND DUAL BIAS VOLTAGE CIRCUIT

摘要

Disclosed is a way to detect ionization within a cylinder of an internal combustion engine where the engine selectively operates in either a spark ignition mode or a HCCI mode. A single ionization detector circuit adapts in response to a control input to alter its bias voltage and its gain to selectively enable effective detection of ionization for each of two different operational modes of an internal combustion engine.