Air-fuel ratio control system for internal combustion engines
First Claim
1. An air-fuel ratio control system for an internal combustion engine having an exhaust system, comprising:
- exhaust gas component concentration-detecting means arranged in said exhaust system of said engine, for detecting concentration of a specific component present in exhaust gases emitted from said engine;
air-fuel ratio control means for controlling an air-fuel ratio of an air-fuel mixture to be supplied to said engine, in response to a difference between an output value from said exhaust gas component concentration-detecting means and a predetermined reference value;
deterioration-detecting means for detecting deterioration of said exhaust gas component concentration-detecting means, based on said output value from said exhaust gas component concentration-detecting means;
display signal-output means for outputting a deterioration display signal when deterioration of said exhaust gas component concentration-detecting means is detected by said deterioration-detecting means; and
control means for determining whether execution of said air-fuel ratio control means is to be inhibited or to be continued, based on a deterioration degree of said exhaust gas component concentration-detecting means when deterioration of said exhaust gas component concentration-detecting means is detected by said deterioration-detecting means.
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Accused Products
Abstract
An air-fuel ratio control system for an internal combustion engine comprises an exhaust gas component concentration sensor arranged in the exhaust system of the engine, for detecting concentration of oxygen present in exhaust gases emitted from the engine, and an ECU which controls the air-fuel ratio of an air-fuel mixture to be supplied to the engine, based on the difference between an output value from the exhaust gas component concentration sensor and a predetermined reference value, and detects deterioration of the exhaust gas component concentration sensor, based on the output value from the exhaust gas component concentration sensor. When the deterioration of the exhaust gas component concentration sensor is detected, a deterioration display signal is outputted, while whether execution of air-fuel ratio control is to be inhibited or to be continued is determined based on the deterioration degree of the exhaust gas component concentration sensor.
14 Citations
5 Claims
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1. An air-fuel ratio control system for an internal combustion engine having an exhaust system, comprising:
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exhaust gas component concentration-detecting means arranged in said exhaust system of said engine, for detecting concentration of a specific component present in exhaust gases emitted from said engine; air-fuel ratio control means for controlling an air-fuel ratio of an air-fuel mixture to be supplied to said engine, in response to a difference between an output value from said exhaust gas component concentration-detecting means and a predetermined reference value; deterioration-detecting means for detecting deterioration of said exhaust gas component concentration-detecting means, based on said output value from said exhaust gas component concentration-detecting means; display signal-output means for outputting a deterioration display signal when deterioration of said exhaust gas component concentration-detecting means is detected by said deterioration-detecting means; and control means for determining whether execution of said air-fuel ratio control means is to be inhibited or to be continued, based on a deterioration degree of said exhaust gas component concentration-detecting means when deterioration of said exhaust gas component concentration-detecting means is detected by said deterioration-detecting means. - View Dependent Claims (2, 3, 4, 5)
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Specification