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Fuel supply apparatus for internal combustion engine

A fuel supply and internal combustion engine technology, applied in mechanical equipment, fuel injection devices, fuel injection control, etc., can solve problems such as the temperature rise of the injector in the cylinder, and achieve the effect of simplifying the structure

Inactive Publication Date: 2007-09-19
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, if the amount of fuel injected from the in-cylinder injector is reduced or even stopped, the temperature at the tip of the in-cylinder injector increases because the in-cylinder injector is not cooled by the fuel passing through it

Method used

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  • Fuel supply apparatus for internal combustion engine
  • Fuel supply apparatus for internal combustion engine
  • Fuel supply apparatus for internal combustion engine

Examples

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no. 1 example

[0060] A fuel injection apparatus for an internal combustion engine according to a first embodiment of the present invention will now be described with reference to FIGS. 1 and 2 . In this embodiment, a fuel injection device for a six-cylinder gasoline engine (as an internal combustion engine) will be described.

[0061] As shown in FIG. 1, the fuel injection apparatus includes a low-pressure fuel supply system 3 that injects fuel into an intake port 1 to provide an air-fuel mixture that is supplied to a combustion chamber 2, and supplies fuel directly into the combustion chamber 2. High pressure fuel supply system 4. The low-pressure fuel supply system 3 and the high-pressure fuel supply system 4 share a low-pressure fuel passage 7 through which fuel (hereinafter referred to as “low-pressure fuel”) is supplied from the fuel tank 5 to the low-pressure fuel pump 6 .

[0062] The low-pressure fuel supply system 3 includes an intake delivery pipe 8 connected to the low-pressure ...

no. 2 example

[0109] A second embodiment of the present invention will be described with reference to FIGS. 3 and 4 . The structure of the fuel injection apparatus for an internal combustion engine according to the second embodiment is the same as that shown in FIG. 1 , so description thereof will not be repeated. The control process in the fuel injection device will now be described. FIG. 3 is a flowchart showing a control procedure in the second embodiment, and FIG. 4 is a timing chart showing a control state in the second embodiment.

[0110] The fuel injection apparatus of the second embodiment monitors the fuel pressure inside the in-cylinder injector 13, and when the fuel pressure obtained by monitoring is not lower than the reference pressure P1, it delivers the in-cylinder injection to which the in-cylinder injector 13 is mounted. The fuel in the tube 12 is released outward. A specific control process and control state for releasing fuel will be described with reference to FIGS. 3...

no. 3 example

[0128]A third embodiment of the present invention will now be described. FIG. 5 shows a fuel supply system 90 of the engine controlled by the engine ECU as the control device according to the present embodiment. The engine is a V-shaped eight-cylinder gasoline engine, and has an in-cylinder injector 110 for injecting fuel into each cylinder, and an intake manifold injector for injecting fuel into an intake manifold of each cylinder 120. Note that the present invention is not exclusively applied to the above-mentioned engines, but is also applicable to other types of gasoline engines as well as common rail diesel engines. Furthermore, the number of high-pressure fuel pumps is not limited to one but may be two or more.

[0129] As shown in FIG. 5 , this fuel supply system 90 includes a supply pump 100 provided in the fuel tank for supplying fuel at a low pressure discharge pressure (about 400 kPa corresponding to the pressure of the pressure regulator), a high-pressure fuel pu...

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PUM

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Abstract

The engine ECU executes a program including the step (S100) of detecting an engine coolant temperature, the step (S110) of detecting an engine speed and an engine load, the step (S120) of estimating a temperature at a tip end of an in-cylinder injector based on the engine coolant temperature, the engine speed and the engine load, and, when the temperature at the tip end is greater than a guaranteed temperature (YES in S130), the step (S140) of calculating a drive duty of a high-pressure fuel pump that ensures a decrease of the temperature at the tip end of the in-cylinder injector to the guaranteed temperature, and the step (S160) of controlling the high-pressure fuel pump using the drive duty.

Description

technical field [0001] The invention relates to a fuel supply device for an internal combustion engine having only an in-cylinder injector injecting fuel into a cylinder, or for an in-cylinder injector and an intake manifold injecting fuel into an intake manifold or an intake port Fuel supply equipment for internal combustion engines with tube injectors. More specifically, the present invention relates to a technique for suppressing the formation of deposits in an injection hole of an in-cylinder injector. Background technique [0002] A fuel injection apparatus for an internal combustion engine provided with an in-cylinder injector and an intake manifold injector and for controlling a fuel injection ratio between the two injectors is described, for example, in Japanese Patent Laid-Open Publication No. 07-103048. [0003] In the apparatus described in Japanese Patent Laid-Open Publication No. 07-103048, in-cylinder injectors corresponding to individual cylinders are connect...

Claims

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Application Information

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IPC IPC(8): F02D41/38F02M53/04F02M63/02
Inventor 秋田龙彦仓田尚季山崎大地坂井光人
Owner TOYOTA JIDOSHA KK
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