Method of electronic fuel injection feedback control

Details Method of electronic fuel injection feedback control Method of electronic fuel injection feedback control

1994-05-04

1995-11-21

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60285, 123696, F01N 320

Patent

active

054675936

ABSTRACT:
A method of feedback control for an electronic fuel injection system in an internal combustion engine includes the steps of calculating a front O.sub.2 sensor switching voltage threshold based on a signal from a front O.sub.2 sensor upstream of a catalyst in an exhaust system for the engine and from a rear O.sub.2 sensor downstream of the catalyst, comparing a voltage output of the front O.sub.2 sensor to the calculated front O.sub.2 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.

REFERENCES:
patent: 5003944 (1991-04-01), Moote et al.
patent: 5003952 (1991-04-01), Weglarz et al.
patent: 5003953 (1991-04-01), Weglarz et al.
patent: 5272872 (1993-12-01), Grutter
patent: 5319921 (1994-06-01), Gopp
patent: 5363647 (1994-11-01), Ohuchi

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