Title:
EGR SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/024551
Kind Code:
A1
Abstract:
This EGR system comprises: an EGR valve (14) that regulates the flow rate of EGR gas in an EGR passage (12); an EGR cooler (13) that performs heat exchange between the EGR gas and engine cooling water to cool the EGR gas flowing through the EGR passage (12); a bypass passage (16) that allows a portion of the EGR gas flowing toward the EGR cooler (13) in the EGR passage (12) to avoid the EGR cooler (13); a bypass valve (17) that opens and closes the bypass passage (16); a wall temperature sensor (78) that is provided in the EGR passage (12) downstream of the EGR cooler (13) and the bypass passage (16) and that detects the wall temperature of the EGR passage (12); and an ECU (80) that diagnoses a failure of the bypass valve (17) on the basis of at least the operating state of the bypass valve (17) and the detected wall temperature, and that controls the EGR valve (14) in accordance with the result of the diagnosis.
Inventors:
YOSHIOKA MAMORU (JP)
SO KAISHO (JP)
BESSHO TAKASHI (JP)
KAWAI SHINJI (JP)
SO KAISHO (JP)
BESSHO TAKASHI (JP)
KAWAI SHINJI (JP)
Application Number:
PCT/JP2021/021502
Publication Date:
February 03, 2022
Filing Date:
June 07, 2021
Export Citation:
Assignee:
AISAN IND (JP)
International Classes:
F02M26/25; F02D43/00; F02M26/47; F02M26/49
Foreign References:
| JP2010539388A | 2010-12-16 | |||
| JP2003247459A | 2003-09-05 |
Attorney, Agent or Firm:
COSMOS INTERNATIONAL PATENT & TRADEMARK OFFICE (JP)
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