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Patent Searching and Data


Title:
ERROR DIAGNOSIS DEVICE AND ERROR DIAGNOSIS METHOD
Document Type and Number:
WIPO Patent Application WO/2019/181996
Kind Code:
A1
Abstract:
An error diagnosis device and error diagnosis method whereby the location of errors can be identified without disassembly. The error diagnosis device (100) diagnoses errors in a fuel pump (5) that comprises: a flowrate adjustment valve (6) that adjusts the flowrate of fuel pumped up from a fuel tank (2); and a high-pressure pump (7) that pressurizes the flowrate-adjusted fuel and discharges same to a common rail (8). The error diagnosis device (100) has: an input unit (110) that receives detected values for pressure inside the common rail (8); a calculation unit (120) that, if the detected values are less than a target common rail pressure, calculates the pressure differences and the fuel pump (5) discharge amounts; and a determination unit (130) that determines whether or not a set time has lapsed in a state in which the pressure differences are at least a first threshold value and less than a second threshold value and the discharge amounts are at least a third threshold value and less than a fourth threshold value. The determination unit (130) determines that an error has occurred in the high-pressure pump (7) if the set time has lapsed and determines that an error has occurred in the flowrate adjustment valve (6) if the set time has not lapsed.

Inventors:
KOBAYASHI, Yuusuke (Fujisawa Plant 8, Tsuchidana, Fujisawa-sh, Kanagawa 81, 〒2520881, JP)
SHIDOMI, Katsushi (Fujisawa Plant 8, Tsuchidana, Fujisawa-sh, Kanagawa 81, 〒2520881, JP)
NODA, Kunio (Fujisawa Plant 8, Tsuchidana, Fujisawa-sh, Kanagawa 81, 〒2520881, JP)
ISHII, Daiki (Fujisawa Plant 8, Tsuchidana, Fujisawa-sh, Kanagawa 81, 〒2520881, JP)
OKAZAKI, Fumihiko (6-26-1 Minami-Oi, Shinagawa-k, Tokyo 22, 〒1408722, JP)
Application Number:
JP2019/011639
Publication Date:
September 26, 2019
Filing Date:
March 20, 2019
Export Citation:
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Assignee:
ISUZU MOTORS LIMITED (6-26-1, Minami-Oi Shinagawa-k, Tokyo 22, 〒1408722, JP)
International Classes:
F02M59/44; F02M59/36; F02M63/00; G01M99/00
Foreign References:
JP2004108171A2004-04-08
JP2011196186A2011-10-06
JP2004068810A2004-03-04
JP2007071067A2007-03-22
Attorney, Agent or Firm:
WASHIDA, Kimihito (8th Floor, Shinjuku First West Bldg. 1-23-7, Nishi-Shinjuku, Shinjuku-k, Tokyo 23, 〒1600023, JP)
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