Method of electronic fuel injection feedback control

摘要

A method of feedback control for an electronic fuel injection system in an internal combustion engine includes the steps of calculating a front O2 sensor switching voltage threshold based on a signal from a front O2 sensor upstream of a catalyst in an exhaust system for the engine and from a rear O2 sensor downstream of the catalyst, comparing a voltage output of the front O2 sensor to the calculated front O2 sensor switching voltage threshold to determine if a fuel/air ratio of the engine is rich or lean, and decreasing or increasing an amount of fuel to the engine by fuel injectors of the electronic fuel injection system if the fuel/air ratio is determined rich or lean, respectively.