Air-fuel ratio control system for internal combustion engine

A control device and air-fuel ratio technology, applied in engine control, fuel injection device, fuel injection control, etc., can solve the problem of not being able to obtain the air-fuel ratio control signal SCTL, and achieve the effect of maintaining control performance
CN101050733AInactive Publication Date: 2007-10-10HONDA MOTOR CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HONDA MOTOR CO LTD
Publication Date
2007-10-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

An air-fuel ratio control system for an internal combustion engine having a catalyst provided in an exhaust system of the engine for purifying exhaust gases and a first oxygen concentration sensor disposed upstream of the catalyst is disclosed. The air-fuel ratio control system controls an air-fuel ratio of an air-fuel mixture supplied to the engine. A degree of response deterioration of the first oxygen concentration sensor is detected. A response delay of the first oxygen concentration sensor is compensated according to the detected degree of deterioration to calculate a compensated sensor output. The air-fuel ratio is controlled so that a detected air-fuel ratio calculated from the compensated sensor output coincides with a target air-fuel ratio. A frequency characteristic of the compensation is adjusted according to the detected degree of deterioration.
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Description

technical field

[0001] The present invention relates to an internal combustion engine air-fuel ratio control device, and more particularly to an internal combustion engine air-fuel ratio control device having a function of judging the deterioration of the characteristics of an oxygen concentration sensor provided in an exhaust system. Background technique

[0002] Patent Document 1 discloses a method of judging the deterioration of the oxygen concentration sensor based on the output of the oxygen concentration sensor when the fuel supply cut-off operation of the internal combustion engine is started or when the fuel supply is restarted. , the control gain of the air-fuel ratio feedback control corresponding to the output of the oxygen concentration sensor is adjusted.

[0003] More specifically, the control gain of the air-fuel ratio feedback control is adjusted so that the greater the degree of deterioration of the oxygen concentration sensor, the smaller.

[0004] [Patent...

Claims

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