The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 13, 1998
Filed:
Mar. 04, 1996
Makoto Shoji, Zama, JP;
Youichi Kishimoto, Chigasaki, JP;
Nissan Motor Co., Ltd., Kanagawa, JP;
Abstract
A secondary air supply apparatus for an internal combustion engine is provided with an air-fuel ratio sensor disposed upstream of an catalytic converter in an exhaust passage. An outlet port of a secondary air supply conduit is formed upstream of and in the vicinity of the air-fuel ratio sensor. Air discharged from an air pump is supplied to the exhaust passage through the secondary air supply conduit. A control unit diagnoses as to whether or not the air-fuel ratio sensor is activated by checking as to whether a detection signal of the air-fuel ratio sensor is out of a predetermined range or not. Then, the control unit diagnoses as to whether the supply of the secondary air is normal or not on the basis of the detection signal of the air-fuel ratio sensor. Therefore, the diagnosis of the supply of the secondary air is correctly executed.