Air-fuel ratio control system for internal combustion engines
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsHiroshi Ito, Yoshiharu Abe, Tsuyoshi Takizawa, Yoshihisa Hara
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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.
Claims13
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.
Dependencies are inferred from the claim text.