Air/fuel feedback control system

Details Air/fuel feedback control system Air/fuel feedback control system

1993-01-11

1994-07-19

Kamen, Noah P.

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60274, 123703, F02B 1916

Patent

active

053297644

ABSTRACT:
An air/fuel control system for internal combustion engines having three-way (NOx, CO, and HC) catalytic converters. A feedback variable is generated by subtracting the normalized output of a nitrogen oxide sensor from the normalized output of a combined HC/CO sensor. The zero crossing point of the feedback variable identifies the operating point for optimal conversion efficiency of the catalytic converter and is used to trim liquid fuel delivery for maintaining optimal conversion efficiency.

REFERENCES:
patent: 4194471 (1980-03-01), Baresel
patent: 4789939 (1988-12-01), Hamburg
patent: 4878473 (1989-11-01), Nakaniwa et al.
patent: 4915080 (1990-04-01), Nakaniwa et al.
patent: 4988428 (1991-01-01), Iwakiri et al.

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