Method of detecting deterioration of exhaust gas ingredient conc

Details Method of detecting deterioration of exhaust gas ingredient conc Method of detecting deterioration of exhaust gas ingredient conc

1991-11-22

1993-01-19

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4114

Patent

active

051799294

ABSTRACT:
A method of detecting deterioration of an exhaust gas ingredient concentration sensor for use in controlling an air-fuel ratio of a mixture supplied to an internal combustion engine having an exhaust system in which the sensor is arranged. The sensor has an output characteristic approximately proportional to concentration of a specific ingredient in exhaust gases emitted from the engine. The air-fuel ratio is feedback-controlled to a desired air-fuel ratio by calculating an amount of fuel supplied to the engine by the use of a desired air-fuel ratio coefficient indicative of the desired air-fuel ratio and set in dependence on operating conditions of the engine, and an air-fuel ratio correction coefficient set in dependence on a value of an output from the sensor and the desired air-fuel ratio coefficient. A plurality of average values of the air-fuel ratio correction coefficient are calculated, respectively, when the desired air-fuel ratio falls within a plurality of predetermined ranges. The average values thus calculated are compared with each other. A degree of deterioration of the sensor is determined from results of the comparison. Further, a method of feedback-controlling the air-fuel ratio in the above-mentioned manner, in which the value of the output from the sensor is corrected in response to the degree of deterioration thus determined.

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patent: 5048494 (1991-09-01), Fujimoto et al.
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patent: 5065728 (1991-11-01), Nakaniwa
patent: 5070847 (1991-12-01), Akiyama et al.
patent: 5094214 (1992-03-01), Kotzan

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