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Title:
RELIEF VALVE DETERMINING DEVICE FOR HIGH-PRESSURE FUEL SUPPLY SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/198639
Kind Code:
A1
Abstract:
A relief valve determining device (90) determines that a relief valve (80) of a high-pressure fuel supply system is in an open state, where the high-pressure fuel supply system is provided with: a fuel injection valve (62); a high-pressure pump (30); a pressure sensor (82) which detects fuel pressure on a discharge side of the high-pressure pump; and the relief valve (80) which, when the discharge side fuel pressure is higher than a valve opening pressure, adopts an open state to cause the discharge side fuel pressure to drop to a prescribed pressure. The relief valve determining device is provided with an estimating unit which estimates the discharge side fuel pressure on the basis of a fuel injection quantity of the fuel injection valve, on the assumption that fuel is not discharged by the high-pressure pump from a time at which the detected fuel pressure changes from a state higher than a first pressure to a state lower than the first pressure, and a determining unit which determines that the relief valve is in an open state on the basis of a mode of reduction in the estimated fuel pressure and a mode of reduction in the detected fuel pressure.

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Inventors:
SAKAMOTO YURI (JP)
KANAYA TOMOHIRO (JP)
NISHIO TAKAFUMI (JP)
Application Number:
PCT/JP2018/012363
Publication Date:
November 01, 2018
Filing Date:
March 27, 2018
Export Citation:
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Assignee:
DENSO CORP (JP)
MAZDA MOTOR (JP)
International Classes:
F02D41/22; F02M55/02; F16K37/00
Foreign References:
JP2007023833A2007-02-01
JP2011236753A2011-11-24
JP2010025102A2010-02-04
JP2007182799A2007-07-19
JP2016050531A2016-04-11
JP2005155421A2005-06-16
Attorney, Agent or Firm:
YAMADA, Tsuyoshi (JP)
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