FILTER FAILURE DETECTION DEVICE, AND PARTICULATE MATTER DETECTION DEVICE

Title:

FILTER FAILURE DETECTION DEVICE, AND PARTICULATE MATTER DETECTION DEVICE

Document Type and Number:

WIPO Patent Application WO/2016/052734

Kind Code:

A1

Abstract:

　When a DPF is the filter serving as criterion for failure assessment, a control unit (6) estimates the output value of a PM sensor situated downstream from the DPF (S2), and decides whether the estimated output value exceeds a prescribed value (S3). When the prescribed value has been exceeded (S3: YES), the control unit detects the output value of the PM sensor (S4), and then heats the PM sensor with a heater (S5). Further, the control unit detects the output value of the PM sensor warmed by heating (S6), calculates the rate of change of the output value before and after heating (S7), and on the basis of the rate of change obtained thereby, estimates the average particle diameter of the PM (S8), and corrects the sensor output on the basis of the average particle diameter (S9). On the basis of a comparison of the corrected sensor output and a threshold value, the control unit determines whether there is a failure of the DPF (S10-S12).

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Inventors:

SHIMOKAWA HIRONOBU (JP)
KOIKE KAZUHIKO (JP)
TAKIZAWA KENSUKE (JP)
YOSHIDOME MANABU (JP)
TAMURA MASAYUKI (JP)

Application Number:

PCT/JP2015/078060

Publication Date:

April 07, 2016

Filing Date:

October 02, 2015

Export Citation:

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Assignee:

DENSO CORP (JP)

International Classes:

G01N27/04; F01N3/022; G01N15/06; G01N15/08

Domestic Patent References:

WO2011083581A1	2011-07-14
WO2013030930A1	2013-03-07

Foreign References:

JP2012092700A	2012-05-17
JP2013253544A	2013-12-19
JP2012189049A	2012-10-04

Other References: