FUEL INJECTION SYSTEM METHOD AND APPARTUS USING OXYGEN SENSOR SIGNAL CONDITIONING TO MODIFY AIR/FUEL RATIO

摘要

A method and apparatus for externally modifying the operation of a closed loop electronic fuel injection control system that is normally used with a standard oxygen sensor, which method and apparatus includes replacing the standard oxygen sensor with a wide band oxygen sensor. The signal from the wide band oxygen sensor is processed in a first signal-conditioning module and coupled to the input of the electronic fuel injection control system. The first signal-conditioning module simulates the appearance of a standard oxygen sensor to the electronic fuel injection control system. In a second embodiment, a method and apparatus for externally modifying the operation of a closed loop electronic fuel injection control system that is normally used with a wide band oxygen sensor, includes intercepting the signal from the wide band oxygen sensor in a second signal-conditioning module. The second signal-conditioning module receives a first current from the wide band oxygen sensor and provides a second current to the electronic fuel injection control system.