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:
Mar. 30, 2004
Filed:
Aug. 28, 2002
Kazuo Kobayashi, Nagoya, JP;
Hiroshi Haraguchi, Kariya, JP;
Toshio Kondo, Kariya, JP;
Sumiko Kohira, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
An O amount in the intake air is determined based on a fresh air and an EGR gas. A consumed O amount is determined with a command injection amount Qr. Then, the consumed O amount is subtracted from the O amount in the intake air to obtain an exhaust O amount. An exhaust O concentration is estimated based on the exhaust O amount. According to the invention, the system is not affected by a delay for the exhaust gas to reach an O sensor and a delay of the chemical reaction in the O sensor. Therefore, the exhaust O concentration can be highly precisely estimated compare to the case in which the exhaust O concentration is detected by the O sensor.