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 (JP)
SHIDOMI KATSUSHI (JP)
NODA KUNIO (JP)
ISHII DAIKI (JP)
OKAZAKI FUMIHIKO (JP)
SHIDOMI KATSUSHI (JP)
NODA KUNIO (JP)
ISHII DAIKI (JP)
OKAZAKI FUMIHIKO (JP)
Application Number:
PCT/JP2019/011639
Publication Date:
September 26, 2019
Filing Date:
March 20, 2019
Export Citation:
Assignee:
ISUZU MOTORS LTD (JP)
International Classes:
F02M59/44; F02M59/36; F02M63/00; G01M99/00
Foreign References:
| JP2004108171A | 2004-04-08 | |||
| JP2011196186A | 2011-10-06 | |||
| JP2004068810A | 2004-03-04 | |||
| JP2007071067A | 2007-03-22 |
Attorney, Agent or Firm:
WASHIDA, Kimihito (JP)
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