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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.:

US 10578518 B1

PDFFull Text
Date of Patent:
Mar. 03, 2020

Filed:

Oct. 02, 2015

Filter failure detection device and particulate matter detection device

Applicant:

Denso Corporation, Kariya, Aichi-pref., JP;

Inventors:

Hironobu Shimokawa, Nishio, JP;

Kazuhiko Koike, Nishio, JP;

Kensuke Takizawa, Nishio, JP;

Manabu Yoshidome, Kariya, JP;

Masayuki Tamura, Kariya, JP;

Assignee:

DENSO CORPORATION, Kariya, JP;

Attorney:

Nixon & Vanderhye P.C.

Primary Examiner:

Eric S McCall

Assistant Examiner:

Timothy P Graves

Int. Cl.
CPC ...
G01M 15/10 (2006.01); G01N 15/02 (2006.01); F02D 41/14 (2006.01); F02D 41/02 (2006.01); G01N 15/06 (2006.01); G01N 1/22 (2006.01); G01N 35/00 (2006.01); G01N 27/04 (2006.01); F01N 3/021 (2006.01); F01N 11/00 (2006.01); G01N 15/08 (2006.01);
U.S. Cl.
CPC ...
G01M 15/102 (2013.01); F01N 3/021 (2013.01); F01N 11/007 (2013.01); F02D 41/0235 (2013.01); F02D 41/1486 (2013.01); F02D 41/1495 (2013.01); G01N 1/2252 (2013.01); G01N 15/0266 (2013.01); G01N 15/0606 (2013.01); G01N 15/0656 (2013.01); G01N 15/0806 (2013.01); G01N 27/04 (2013.01); G01N 35/00613 (2013.01); F01N 2550/04 (2013.01); F01N 2560/05 (2013.01); F01N 2560/06 (2013.01); F01N 2560/20 (2013.01); G01N 2015/0277 (2013.01); G01N 2015/084 (2013.01); Y02T 10/20 (2013.01); Y02T 10/47 (2013.01); Y02T 10/48 (2013.01);
Abstract

A control unit () estimates an output value of a PM sensor (S) located at a downstream side of a DPF used as a reference filter, and detects whether the estimated output value exceeds a predetermined value (S). When the estimated output value exceeds the predetermined value (YES in S), the control unit detects an output value of the PM sensor (S), and a heater heats the PM sensor (S). The control unit detects an output value of the PM sensor (S) after the PM sensor is heated, and calculates a change ratio of the output values of the PM sensor before and after heating (S). The control unit estimates an average particle size of PM based on the calculated change ratio (S), and detects whether the DPF has failed based on a comparison result of a corrected output value of the PM sensor with a threshold value.

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