Air-fuel ratio control apparatus for an internal combustion engi

Internal-combustion engines – Charge forming device – Fuel injection system

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F02D 4104

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053638263

ABSTRACT:
An apparatus for controlling an air-fuel ratio in a lean burn internal combustion engine, such that three different air-fuel ratio zones are set, the three zones being an ultra lean zone with a low load, a medium lean zone with a medium load, and a non-lean zone with a high load. When the engine is under low load conditions, a map FLEANPM is selected to obtain an ultra lean air-fuel ratio based on detected intake pressure PM values and engine speed NE. When the engine is under medium load conditions, a map FLEANTA is selected to obtain a medium lean air-fuel ratio based on a detected throttle opening values TA and engine speed NE. When the engine is under high load, conditions the lean correction control is canceled, thereby obtaining a theoretical air-fuel ratio or an air-fuel ratio smaller than the theoretical air-fuel ratio, and when the engine remains at a point in the medium lean zone, the air-fuel ratio decreases gradually toward the theoretical air-fuel ratio as time elapses.

REFERENCES:
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patent: 4587938 (1986-05-01), Kobayashi et al.
patent: 4594984 (1986-06-01), Raff et al.
patent: 4809501 (1989-03-01), Kayanuma et al.
patent: 5016595 (1991-05-01), Kawai et al.
patent: 5190008 (1993-03-01), Yamasaki et al.
Okano, Hiroshi; "Lean Burn Gasoline Engine" Paper at Symposium of Japanese Society of Automobile Technology on Feb. 21, 1992.
Patent Abstract of Japan, vol. 12 No. 120 (M685) Apr. 1988 Re JP-A 62-247142.

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