Air-fuel ratio control device of internal combustion engine
AssigneeKeihin Corporation
InventorSatoshi Ichihashi
Life of this patent
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Abstract
An air-fuel ratio control apparatus for controlling an air-fuel ratio of a supplied air-fuel mixture of an internal combustion engine to a target air-fuel ratio by a feedback control in accordance with an output signal of an oxygen concentration sensor provided at an exhaust pipe of the internal combustion engine, in which a perturbation control for vibrating the air-fuel ratio periodically to a rich side and a lean side centering on the target air-fuel ratio is executed in accordance with the output signal of the oxygen concentration sensor in a predetermined high load and high rotation operating state of the internal combustion engine.
Claims7
An air-fuel ratio control apparatus including an oxygen concentration sensor for generating an output signal depending on an oxygen concentration in exhaust gas at an exhaust pipe of an internal combustion engine, for controlling an air-fuel ratio of an air-fuel mixture supplied to said internal combustion engine in accordance with the output signal of said oxygen concentration sensor to a target air-fuel ratio by a feedback control, said air-fuel ratio control apparatus comprising:
- detecting means for detecting a predetermined high load and high rotation operating state of said internal combustion engine to generate a detecting signal;
- and
- controlling means for executing a perturbation control for vibrating the air-fuel ratio periodically to a rich side and a lean side centering on the target air-fuel ratio in accordance with the output signal of said oxygen concentration sensor when the detecting signal is generated.
Dependencies are inferred from the claim text.