Air-fuel ratio control system for internal combustion engines
First Claim
1. In an air-fuel ratio control system for an internal combustion engine including an exhaust passage, and a catalyst arranged in said exhaust passage for purifying exhaust gases emitted from said engine, said air-fuel ratio control system including first air-fuel ratio-detecting means arranged at a location upstream of said catalyst for detecting concentration of a particular component of said exhaust gases, and air-fuel ratio control means for controlling an air-fuel ratio of a mixture supplied to said engine in response to an output from said first air-fuel ratio-detecting means,the improvement comprising:
- sulfur poisoning-detecting means for detecting deterioration of said catalyst caused by sulfur poisoning; and
control parameter-changing means for changing a control parameter for use in controlling an operation of said engine when said deterioration of said catalyst caused by sulfur poisoning is detected.
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Accused Products
Abstract
An air-fuel ratio control system for an internal combustion engine controls the air-fuel ratio of a mixture supplied to the engine in response to an output from a first air-fuel ratio sensor arranged in an exhaust passage at a location upstream of a catalyst for purifying exhaust gases emitted from the engine. A control parameter for use in controlling an operation of the engine is changed when deterioration of the catalyst caused by sulfur poisoning is detected to desulfurize the catalyst.
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Citations
13 Claims
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1. In an air-fuel ratio control system for an internal combustion engine including an exhaust passage, and a catalyst arranged in said exhaust passage for purifying exhaust gases emitted from said engine, said air-fuel ratio control system including first air-fuel ratio-detecting means arranged at a location upstream of said catalyst for detecting concentration of a particular component of said exhaust gases, and air-fuel ratio control means for controlling an air-fuel ratio of a mixture supplied to said engine in response to an output from said first air-fuel ratio-detecting means,
the improvement comprising: -
sulfur poisoning-detecting means for detecting deterioration of said catalyst caused by sulfur poisoning; and control parameter-changing means for changing a control parameter for use in controlling an operation of said engine when said deterioration of said catalyst caused by sulfur poisoning is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification