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Title:
ABNORMALITY DETECTION DEVICE FOR EXHAUST GAS RECIRCULATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/057083
Kind Code:
A1
Abstract:
Provided is an abnormality detection device for an exhaust gas recirculation device capable of detecting abnormality of an EGR valve while suppressing an influence by a magnitude relation between an intake pressure and an exhaust gas pressure. An electronic control unit (ECU) performs processing for extracting pulsation from an intake pipe pressure value. The ECU performs arithmetic processing for performing fast Fourier transform (FFT) on an output waveform of an intake pressure sensor obtained by sampling processing, and further performs extraction processing for extracting a "frequency component corresponding to the period of exhaust pulsation". The ECU performs processing for determining whether or not the magnitude of the pulse (magnitude of the amplitude) extracted at the step exceeds a threshold value. If the magnitude of the amplitude exceeds the threshold value, the ECU performs processing for determining that there is fully closing abnormality of the EGR valve.

Inventors:
MIYASHITA, Shigeki (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
宮下 茂樹 (〒71 愛知県豊田市トヨタ町1番地トヨタ自動車株式会社内 Aichi, 〒4718571, JP)
SADAKANE, Shinji (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
定金 伸治 (〒71 愛知県豊田市トヨタ町1番地トヨタ自動車株式会社内 Aichi, 〒4718571, JP)
INOUE, Masahiro (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
Application Number:
JP2011/074443
Publication Date:
May 03, 2012
Filing Date:
October 24, 2011
Export Citation:
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Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA (1 Toyota-cho, Toyota-shi Aichi, 71, 〒4718571, JP)
トヨタ自動車株式会社 (〒71 愛知県豊田市トヨタ町1番地 Aichi, 〒4718571, JP)
MIYASHITA, Shigeki (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
宮下 茂樹 (〒71 愛知県豊田市トヨタ町1番地トヨタ自動車株式会社内 Aichi, 〒4718571, JP)
SADAKANE, Shinji (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
定金 伸治 (〒71 愛知県豊田市トヨタ町1番地トヨタ自動車株式会社内 Aichi, 〒4718571, JP)
International Classes:
F02M25/07; F02D43/00; F02D45/00
Foreign References:
JPH08284764A1996-10-29
JPH04140464A1992-05-14
JP2003193900A2003-07-09
JP2002227727A2002-08-14
JP2010127203A2010-06-10
JP2002227727A2002-08-14
JP2010127203A2010-06-10
Other References:
See also references of EP 2472092A4
Attorney, Agent or Firm:
TAKAHASHI, Hideki et al. (Takada, Takahashi & Partners 5th Floor, Intec 88 Bldg., 20, Araki-cho, Shinjuku-k, Tokyo 07, 〒1600007, JP)
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Claims:



 
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