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:
Dec. 26, 2006
Filed:
Oct. 02, 2003
Tsukasa Kuboshima, Okazaki, JP;
Shinichiro Okugawa, Toyota, JP;
Masumi Kinugawa, Okazaki, JP;
Kiyonori Sekiguchi, Okazaki, JP;
Tsukasa Kuboshima, Okazaki, JP;
Shinichiro Okugawa, Toyota, JP;
Masumi Kinugawa, Okazaki, JP;
Kiyonori Sekiguchi, Okazaki, JP;
Denso Corporation, Kariya, JP;
Abstract
A diesel particulate filter (DPF) having an oxidation catalyst is disposed between exhaust pipes of an internal combustion engine. An exhaust gas temperature sensor senses outlet gas temperature of the DPF. An engine control unit (ECU) calculates estimated central temperature of the DPF from an output of the exhaust gas temperature sensor with the use of an inverse transfer function of a change in the outlet gas temperature with respect to a change in temperature of the DPF. Based on the estimated temperature, the ECU performs excessive temperature increase prevention control or regeneration control of the DPF. The transfer function is simply expressed with first-order lag and dead time. A time constant of the first-order lag and the dead time are set in accordance with an exhaust gas flow rate.