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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsShigemasa Hirooka, Mamoru Yoshioka
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A secondary air supply apparatus controls emissions from an engine through secondary combustion of combustible matters in exhaust gas accomplished by supplying air to an exhaust pipe upstream of an emission control device. A pressure behavior pattern is determined from a pressure value detected by a pressure sensor disposed between an air pump and an open-close valve, and a pressure variation value. The secondary air supply apparatus determines operational states of the air pump and the open-close valve based on variations of the pressure behavior pattern at the time of a secondary air supply control and at the time of a secondary air stop control.
A secondary air supply apparatus, comprising:
A method for detecting an abnormality of a secondary air supply apparatus for supplying a secondary air to an upstream side of an emission control device in an exhaust system of an internal combustion engine, the method comprising:
A method for detecting an abnormality of a secondary air supply apparatus that includes a secondary air supply passage for supplying a secondary air to an upstream side of an emission control device in an exhaust system of an internal combustion engine, an opening-closing device that opens and closes the secondary air supply passage, a pressure sensor disposed in the secondary air supply passage, the method comprising:
Dependencies are inferred from the claim text.