Closed-loop mixture control system for internal combustion engine using error-corrected exhaust composition sensors

摘要

A closed-loop mixture control system for an internal combustion engine comprises two exhaust composition sensors having different output characteristic curves that intersect at a point corresponding to the stoichiometric air-fuel ratio at which catalytic converters operate at a maximum conversion efficiency. The outputs from the two sensors are used to generate a signal which is substantially free from error introduced to the sensors due to varying external conditions.