Air/fuel control with adaptively learned reference

Details Air/fuel control with adaptively learned reference Air/fuel control with adaptively learned reference

1994-02-08

1995-03-14

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123695, F02D 4114

Patent

active

053968751

ABSTRACT:
An engine air/fuel control system includes an apparatus and method for adaptively learning a reference voltage. Fuel delivered to the engine is trimmed by a feedback variable provided by integrating a two-state signal resulting from a comparison between the reference voltage and the exhaust gas oxygen sensor output. Each sample period of a microprocessor, a high voltage signal and low voltage signal are generated which track the outer envelope of the sensor signal. Calculation of a midpoint between high and low voltage signals provides the reference which instantaneously tracks the midpoint of the sensor signal.

REFERENCES:
patent: 3973529 (1976-08-01), Wessel et al.
patent: 4109615 (1978-08-01), Asano
patent: 4120269 (1978-10-01), Fujishiro
patent: 4132200 (1979-01-01), Asano et al.
patent: 4170965 (1979-10-01), Aono
patent: 4187806 (1980-02-01), Schnurle et al.
patent: 4458319 (1984-07-01), Chujo et al.
patent: 4459669 (1984-07-01), Chujo et al.
Regelung der Gemischzusammensetzung bei Einspritz-Ottomotoren mit Hilfe der Lambda-Sonde, Bosch Techn. Berichte 6 (1978) (month unknown).

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