Air/fuel control system with improved transient response

Details Air/fuel control system with improved transient response Air/fuel control system with improved transient response

1994-10-17

1996-10-22

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4100

Patent

active

055666639

ABSTRACT:
An engine air/fuel control system and method is provided having feedback control responsive to an exhaust gas oxygen sensor. A fuel command responsive to the EGO sensor is modulated (312) and the modulation disabled in response to detection of an air/fuel transient period (502-510, 610). In addition, feedback control gain is increased (514, 614) and the modulation signal held at a value opposite the state of the EGO sensor occurring upon initiation of the air/fuel transient period (510, 610). An indication is provided that the air/fuel transient is terminated when the EGO sensor switching frequency resumes a normal condition (522-528, 622-628). Modulation is thereafter resumed and the feedback gain restored (532-538, 632-638).

REFERENCES:
patent: 4355618 (1982-10-01), Muller et al.
patent: 4375797 (1983-03-01), Otsuka et al.
patent: 5115781 (1992-05-01), Kurita et al.
patent: 5241943 (1993-09-01), Miyashita et al.
patent: 5253630 (1993-10-01), Akazaki et al.
patent: 5381774 (1995-01-01), Nakajima
SAE Technical Paper Series 910390, entitled "Fuel Injection Control Systems That Improve Three Way Catalyst Conversion Efficiency", by Katashiba et al, dated Feb. 25-Mar. 1, 1991, pp. 1-9.

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