FUEL INJECTION STATE ESTIMATION DEVICE

Japanese Patent JP2017082705

A

PROBLEM TO BE SOLVED: To provide a fuel injection state estimation device which can estimate a fuel injection state when performing minute injection up to further minute injection.SOLUTION: A fuel injection state estimation device is employed to a fuel injection system (10) having a fuel supply pump (16), a fuel injection valve (40) and a fuel pressure sensor (206), and comprises a fuel injection determination part which determines that fuel is injected on condition that a relationship between a parameter indicating a variation of fuel pressure and a first threshold falls into a prescribed relationship, and an injection state estimation part which estimates a fuel injection state when it is determined that the fuel is injected. The fuel injection determination part injects the fuel by minute single-stage injection on condition that the fuel is determined to be in a fuel cut state, fuel supply by the fuel supply pump is stopped, and fuel pressure is controlled to target pressure, and determines that the fuel is injected on condition that a relationship between the parameter and a second threshold which is set so as to more easily determine that the fuel is injected than the first threshold falls into a prescribed relationship.SELECTED DRAWING: Figure 1

ICHIHARA NOBUAKI

JP2015213043A

May 18, 2017

October 29, 2015

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DENSO CORP

F02D41/22; F02D41/12; F02D45/00; F02M59/20; F02M61/10

JP2008144749A	2008-06-26
JP2013133714A	2013-07-08
JP2007187009A	2007-07-26
JP2014196731A	2014-10-16
JP2015105589A	2015-06-08
JPH1077922A	1998-03-24
JP2014181680A	2014-09-29
JP2009299607A	2009-12-24
JP2009057924A	2009-03-19

Tsuyoshi Yamada
Kyoko Hino
Hiroshi Matsuda
Yusuke Kita

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