Air-fuel ratio control for internal combustion engine enabling f

Details Air-fuel ratio control for internal combustion engine enabling f Air-fuel ratio control for internal combustion engine enabling f

1998-04-06

1999-10-19

Kwon, John

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123688, F02M 2500

Patent

active

059671297

ABSTRACT:
An air-fuel ratio control using an A/F sensor which outputs a current representing an air-fuel ratio in response to a voltage applied thereto. If the A/F sensor is still in a state prior to activation and the actual air-fuel ratio is different from an air-fuel ratio represented by a current of the sensor in the state prior to activation when the engine is started, that is, if the air-fuel ratio is put on the rich side by an increased amount of fuel injected at a start of an internal combustion engine at a low temperature or other causes, for example a CPU employed in an ECU, determines whether the difference between the .lambda.-conversion value of the current of the A/F sensor and a target air-fuel ratio is equal to or greater than a predetermined value. If the determination is YES, a feedback control of the air-fuel ratio is started. Then, the CPU carries out the feedback control of the air-fuel ratio based on a deviation of the current of the A/F sensor from a current value representing the target air-fuel ratio.

REFERENCES:
patent: 4785780 (1988-11-01), Kawai
patent: 5575266 (1996-11-01), Iida
patent: 5671721 (1997-09-01), Aoki
patent: 5758310 (1998-05-01), Kato
patent: 5765541 (1998-06-01), Farmer et al.
patent: 5775311 (1998-07-01), Kato et al.

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