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AssigneeHonda Giken Kogyo K.K. (Honda Motor Co., Ltd. in English)
InventorsYukio Miyashita, Hiroshi Ohno, Kunio Noguchi, Hironao Fukuchi
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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.
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 said sensor is arranged, said sensor having an output characteristic approximately proportional to concentration of a specific ingredient in exhaust gases emitted from said engine, said air-fuel ratio being feedback-controlled to a desired air-fuel ratio by calculating an amount of fuel supplied to said engine by the use of a desired air-fuel ratio coefficient indicative of said desired air-fuel ratio and set in dependence on operating conditions of said engine, and an air-fuel ratio correction coefficient set in dependence on a value of an output from said sensor and said desired air-fuel ratio coefficient, the method comprising the steps of:
A method of controlling an air-fuel ratio of a mixture supplied to an internal combustion engine having an exhaust system, and an exhaust gas ingredient concentration sensor arranged in said exhaust system, said sensor having an output characteristic approximately proportional to concentration of a specific ingredient in exhaust gases emitted from said engine, said air-fuel ratio being feedback-controlled to a desired air-fuel ratio by calculating an amount of fuel supplied to said engine by the use of a desired air-fuel ratio coefficient indicative of said desired air-fuel ratio and set in dependence on operating conditions of said engine, and an air-fuel ratio correction coefficient set in dependence on a value of an output from said sensor and said desired air-fuel ratio coefficient, the method comprising the steps of:
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 said sensor is arranged, said sensor having an output characteristic approximately proportional to concentration of a specific ingredient in exhaust gases emitted from said engine, said air-fuel ratio being feedback-controlled to a desired air-fuel ratio set in dependence on operating conditions of said engine by calculating an amount of fuel supplied to said engine by the use of an air-fuel ratio correction value set in dependence on a value of an output from said sensor, the method comprising the steps of:
A method of controlling an air-fuel ratio of a mixture supplied to an internal combustion engine having an exhaust system, and an exhaust gas ingredient concentration sensor arranged in said exhaust system, said sensor having an output characteristic approximately proportional to concentration of a specific ingredient in exhaust gases emitted from said engine, said air-fuel ratio being feedback-controlled to a desired air-fuel ratio set in dependence on operating conditions of said engine by calculating an amount of fuel supplied to said engine by the use of an air-fuel ratio correction value set in dependence on a value of an output from said sensor, the method comprising the steps of:
Dependencies are inferred from the claim text.