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:
May. 29, 2007
Filed:
Aug. 05, 2005
Yasuhiro Oi, Numazu, JP;
Kaoru Ohtsuka, Mishima, JP;
Shinya Kondo, Gotenba, JP;
Hiroyasu Koyama, Mishima, JP;
Tetsuji Nagata, Kariya, JP;
Yasuhiro Oi, Numazu, JP;
Kaoru Ohtsuka, Mishima, JP;
Shinya Kondo, Gotenba, JP;
Hiroyasu Koyama, Mishima, JP;
Tetsuji Nagata, Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Denso Corporation, Kariya, JP;
Abstract
There is provided a device for supplying secondary air, which comprises a secondary air passage for supplying secondary air, to an exhaust passage of an engine, upstream of an exhaust purification device provided in the exhaust passage, a pump provided in the secondary air passage for supplying a secondary air, a battery used for driving the pump, at least one opening-closing device for opening and closing the secondary air passage, and a pressure sensor provided between the pump and the opening-closing device for detecting a pressure in the secondary air passage. A malfunction of at least one of the pump and the opening-closing device is detected on the basis of at least one of the pressures detected when the secondary air passage is opens and when the secondary air passage is closed. The malfunction detection is ceased when the voltage of the battery changes by a value larger than a predetermined value when the pressure sensor detects a malfunction of the pressure variation in the secondary air passage for detecting a malfunction of at least one of the pump and the opening-closing device.