Title:
Fuel filter malfunction detection device
Document Type and Number:
Japanese Patent JP5935814
Kind Code:
B2
Abstract:
A fuel-filter malfunction detection device detects a clogging of a fuel filter when specified conditions are satisfied. In a clogging detection, a command discharge quantity to a high-pressure pump is increased more than a total of a fuel injection quantity and a leakage of the fuel supply system while a pressure-reducing valve is closed. When the fuel filter is clogged, a discharge quantity of the high-pressure pump is decreased relative to the command discharge quantity and a differential pressure is generated between an estimated common-rail pressure and an actual common-rail pressure. When an integrated moving average of the averages of the differential pressure is greater than or equal to a specified value, an ECU determines that the fuel filter has a malfunction. Then, a malfunction flag is turned ON.
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Inventors:
Hiroshi Take
Toyoshima Yoshio
Toyoshima Yoshio
Application Number:
JP2014004257A
Publication Date:
June 15, 2016
Filing Date:
January 14, 2014
Export Citation:
Assignee:
株式会社デンソー
International Classes:
F02M37/22; F02D45/00; F02M37/08
Domestic Patent References:
| JP2003097379A | ||||
| JP2011122518A | ||||
| JP2013119833A | ||||
| JP2009062921A | ||||
| JP2013057269A | ||||
| JP2005233125A |
Attorney, Agent or Firm:
Nagoya International Patent Service Corporation
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