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Device for determining abnormality in fuel injection valve, and method for determining abnormality in fuel injection valve

A technology for judging fuel injection valves and abnormalities, which is applied in fuel injection devices, special fuel injection devices, fuel injection control, etc., and can solve problems such as inability to determine sticking when opening, difficulty in judging sticking when opening an injection valve, and time-consuming problems, etc.

Active Publication Date: 2012-05-30
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in this method, since the occurrence of sticking cannot be determined from the occurrence of sticking until the rail pressure and engine speed fluctuate due to the influence thereof, it takes time until the occurrence of sticking is determined.
In addition, among the fuel injection valves provided separately for a plurality of cylinders, it is difficult to distinguish which injection valve is stuck open.

Method used

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  • Device for determining abnormality in fuel injection valve, and method for determining abnormality in fuel injection valve
  • Device for determining abnormality in fuel injection valve, and method for determining abnormality in fuel injection valve
  • Device for determining abnormality in fuel injection valve, and method for determining abnormality in fuel injection valve

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Embodiment Construction

[0015] Below, refer to Figure 1~4 An embodiment in which the abnormality determination device for a fuel injection valve of the present invention is applied to a fuel injection device for a diesel engine will be described.

[0016] Such as figure 1 As shown, the fuel injection device according to the present embodiment includes one fuel injection valve 20 for each cylinder of the diesel engine, a total of four fuel injection valves 20 . Each fuel injection valve 20 is connected to a common rail 34 via a branch passage 31a.

[0017] The common rail 34 is connected to the fuel tank 32 via the supply passage 31b, and the fuel pump 33 is provided in the middle of the supply passage 31b. As a result, the fuel pumped by the fuel pump 33 is accumulated in the common rail 34 and supplied to each fuel injection valve 20 via the common rail 34 and the branch passage 31 a.

[0018] In addition, a return passage 35 is connected to each fuel injection valve 20 . A return passage 35 is...

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Abstract

Provided is an abnormality determination device for determining the presence of abnormalities in a plurality of fuel injection valves. The abnormality determination device is provided with a pressure sensor, and an electronic control unit. The electronic control unit determines the presence of abnormalities in a fuel injection valve on the basis of the changes in the condition of the fuel, which is detected by means of the pressure sensor. The electronic control unit determines whether or not the fuel injection valve which injected fuel remains open on the basis of the changes in the condition of the fuel pressure at the fuel injection valve which injected fuel, and the changes in the condition of the fuel pressure at the fuel injection valve which did not inject fuel.

Description

technical field [0001] The present invention relates to a fuel injection valve abnormality determination device, and more particularly to an abnormality determination device and a fuel injection valve abnormality determination method for determining the occurrence of opening sticking in fuel injection valves respectively provided for a plurality of cylinders of an internal combustion engine. Background technique [0002] As a method of judging the occurrence of the fuel injection valve being kept open but not closed, the following judging methods are known: monitoring the pressure of the fuel in the common rail or the delivery pipe, that is, the change of the rail pressure, internal combustion engine Based on the changes in the rotation speed, it is detected whether fuel injection continues in violation of the valve closing command based on their change patterns, thereby determining that the injection valve is open and stuck. [0003] However, in this method, since the occur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/22F02M55/02F02M61/16F02M63/00F02M65/00
CPCF02D41/22F02M57/005F02M47/027F02D2200/501F02D41/3836F02D2200/602F02M63/0225F02M63/0045F02M65/003F02M63/0026F02M2200/247
Inventor 古谷启裕伊藤嘉康宫浦猛土山牧男
Owner TOYOTA JIDOSHA KK
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