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:
Jul. 08, 2008
Filed:
Feb. 09, 2005
Yasuhiro Kariya, Oobu, JP;
Tsukasa Kuboshima, Okazaki, JP;
Yasuhiro Kariya, Oobu, JP;
Tsukasa Kuboshima, Okazaki, JP;
Denso Corporation, Kariya, Aichi-Pref., JP;
Abstract
Unless an abnormality exists in piping introducing a pressure from front and rear of DPFinto a differential pressure sensor, pulsations of pressure propagation through an exhaust passageis offset in a detection value of a pressure difference of the differential pressure sensor, and an amplitude of the detection value of the DPF pressure difference resulting from pulsation of the pressure becomes small. If a crack exists in one of the pipingand, the influence of a pulsation of the pressure appears in the DPF pressure difference and the amplitude of the detection value of the DPF pressure difference becomes large. The amplitude of the detection value of the DPF pressure difference is compared with the reference value and is detected as being abnormal when it is large, utilizing the phenomenon described above.