Engine lean air/fuel control system

Details Engine lean air/fuel control system Engine lean air/fuel control system

1995-06-08

1996-12-03

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123695, F02D 4114

Patent

active

055797466

ABSTRACT:
An air/fuel control system for an engine (28) provides an air/fuel indicating signal linearly related to average engine air/fuel operation from a two-state exhaust gas oxygen sensor (44). Fuel delivered to the engine is modulated with a periodic signal (144). A reference value corresponding to a desired air/fuel ratio is subtracted from a rolling average of the exhaust gas oxygen sensor output to provide an error signal (148-152). A feedback variable (FV) for adjusting the engine air/fuel ratio is generated from a proportional plus integral controller having the error signal as its input (156). In this manner, average engine air/fuel ratio is maintained at the desired air/fuel ratio and the rolling average of the exhaust gas oxygen sensor output provides an air/fuel indicating signal.

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patent: 5211011 (1993-05-01), Nishikawa et al.
patent: 5396875 (1995-03-01), Kotwicki et al.
patent: 5440877 (1995-08-01), Kamura et al.

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