FAULT DIAGNOSIS DEVICE FOR EGR SYSTEM

Title:

FAULT DIAGNOSIS DEVICE FOR EGR SYSTEM

Document Type and Number:

WIPO Patent Application WO/2013/080353

Kind Code:

A1

Abstract:

In an engine equipped with an MPL-EGR system having an HPL-EGR mechanism (6) and an LPL-EGR mechanism (7), the pressure difference between the upstream pressure and the downstream pressure of a low-pressure EGR cooler (73) with which the LPL-EGR mechanism (7) is equipped is detected by a differential pressure sensor (89). When the detected actual differential pressure value is higher than a standard differential pressure value for the state wherein the LPL-EGR mechanism (7) is not blocked, and the amount of the divergence thereof reaches a prescribed value, it is determined that a blockage has occurred in the interior of the low-pressure EGR cooler (73). When the detected actual differential pressure value is lower than the standard differential pressure value and the amount of the divergence thereof reaches a prescribed value, it is determined that a blockage has occurred in the interior of piping members (74, 75), rather than in the low-pressure EGR cooler (73).

Inventors:

SAITOH HIROTAKA (JP)
NAKAMURA YOSHITAKA (JP)
KIDOKORO TORU (JP)

Application Number:

PCT/JP2011/077780

Publication Date:

June 06, 2013

Filing Date:

December 01, 2011

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)
SAITOH HIROTAKA (JP)
NAKAMURA YOSHITAKA (JP)
KIDOKORO TORU (JP)

International Classes:

F02M25/07

Foreign References:

JP2001289125A	2001-10-19
JP2008064046A	2008-03-21
JPH0763122A	1995-03-07

Other References: