FUEL INJECTION UNIT FOR INTERNAL COMBUSTION ENGINE

Abstract

The present disclosure provides a fuel injection unit for an internal combustion engine. The fuel injection unit includes: a separator that is disposed in an intake port to supplie air into a combustion chamber formed in an engine head, and that divides a channel for air into an upper channel and a lower channel; a blade disposed ahead of the separator and opening or closing the upper channel or the lower channel by rotating; and a first injector disposed over the intake port. In particular, when the first injector injects fuel, the blade does not interfere with the fuel.

Claims

1. A fuel injection unit for an internal combustion engine, the fuel injection unit comprising: a separator disposed in an intake port configured to supply air into a combustion chamber formed in an engine head, the separator configured to divide a channel for air into an upper channel and a lower channel; a blade disposed ahead of the separator, and configured to open or close the upper channel or the lower channel by rotating; and a first injector disposed over the intake port, wherein when the first injector injects fuel, the blade does not interfere with the fuel.

2. The fuel injection unit of claim 1, wherein a rear end of the separator is positioned behind an end of the first injector.

3. The fuel injection unit of claim 1, wherein the separator and the blade is formed in a single module.

4. The fuel injection unit of claim 1, wherein the first injector is disposed in the engine head.

5. The fuel injection unit of claim 1, wherein a valve angle of the engine head is a predetermined value or less such that the first injector is disposed in the intake port.

6. The fuel injection unit of claim 1, wherein a second injector configured to inject fuel directly into the combustion chamber is disposed under the intake port.

7. The fuel injection unit of claim 1, wherein an avoiding groove is formed at an end of the separator to avoid interference with the first injector when fuel is injected.

8. The fuel injection unit of claim 1, wherein the first injector is in a form of a combined multiple injectors that have smaller capacity than a capacity of the first injector in a form of a single injector.

9. The fuel injection unit of claim 8, wherein a plurality of avoiding grooves are formed at an end of the separator to avoid interference with the combined multiple first injectors when fuel is injected.

10. The fuel injection unit of claim 1, wherein the blade is configured to rotate about a rotary shaft and the rotary shaft is connected to a driving unit and rotated by the driving unit.

Description

DRAWINGS

[0026] In order that the disclosure may be well understood, there will now be described various forms thereof, given by way of example, reference being made to the accompanying drawings, in which:

[0027] FIG. 1 is a view showing a fuel injection unit for an internal combustion engine of the related art;

[0028] FIG. 2 is a view showing a fuel injection unit for an internal combustion engine; and

[0029] FIGS. 3 and 4 are views showing an avoiding groove formed in a separator.

[0030] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.

DETAILED DESCRIPTION

[0031] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.

[0032] A fuel injection unit for an internal combustion engine according to one form of the present disclosure is described hereafter with reference to the accompanying drawings.

[0033] FIG. 2 is a view showing a fuel injection unit for an internal combustion engine according to one form of the present disclosure, and FIGS. 3 and 4 are views showing an avoiding groove 331 formed in a separator 330.

[0034] A fuel injection unit for an internal combustion engine includes: a separator 330 that is disposed in an intake port 300 supplying air into a combustion chamber 200 formed in an engine head 100 and divides a channel 310 for air into an upper channel 311 and a lower channel 313; a blade 400 that is disposed ahead of the separator 330 and opens or closes the upper channel 311 or the lower channel 313 by rotating; and a first injector 500 that is disposed over the intake port 300, in which when the first injector 500 injects fuel, the blade 400 does not interfere the fuel, thereby inhibiting or preventing wall-wetting.

[0035] An intake valve 350 and an exhaust valve 810 are provided for the combustion chamber 200 of the internal combustion engine, where the intake valve 350 is connected to the intake port 300 and the exhaust valve 810 is connected to the exhaust port 800. Air flowing inside through an air cleaner box (not shown), a serge tank (not shown), and a throttle valve (not shown) from the outside of a vehicle is supplied into the combustion chamber 200, and the air supplied in the combustion chamber 200 is mixed with fuel injected from the injectors 500 and 600 and then ignited and burned by a spark plug 700 at the center of the combustion chamber 200.

[0036] The separator 330 and the blade 400 in the intake port 300 guiding the intake air into the combustion chamber 200 enhance tumble for more efficient mixing of air and fuel for combustion.

[0037] The separator 330 is disposed in the intake port 300 and divides the channel 310 for air into the upper channel 311 and the lower channel 313 with the separator 330 therebetween. The rear end of the separator 330 is positioned behind the end of the first injector 500, so when the first injector 500 injects fuel, wall-wetting due to interference with the separator 330 is inhibited or prevented.

[0038] Further, the blade 400 that can rotate about a rotary shaft 410 is positioned ahead of the separator 330, so it guides air by opening or closing the lower channel 313. In particular, when the blade 400 blocks the lower channel 313, all the intake air flows into the combustion chamber 200 through the upper channel 311, so tumble is enhanced. The blade 400 rotates about the rotary shaft 410 and the rotary shaft 410 is connected to an individual driving unit 900 and is rotated by the driving unit 900. The driving unit 900 may be a motor. As described above, since the blade 400 is operated by the driving unit 900, the operation speed can be increased in comparison to the mechanical type of the related art. Further, the engine is mapped with exact prediction of the point of time where tumble starts increasing, so combustion can be more stably performed. Further, it may be possible to increase efficiency by forming the separator 330 and the blade 400 in a single mode and simultaneously using the separator 330 and the blade 400.

[0039] The first injector 500 is disposed in the engine head 100. However, when the valve angle of the engine head 100 is a predetermined value or less, the first injector 500 is positioned in the intake port 300 and injects fuel to the air so that the air and the fuel can be efficiently mixed. Further, the second injector 600 that directly injects fuel into the combustion chamber 200 may be disposed under the intake port 300.

[0040] As shown in FIG. 3, an avoiding groove 331 that is larger than the boundary T of fuel is formed at an end of the separator 330 to avoid interference with the first injector 500 when fuel is injected. Accordingly, interference with the separator 330 does not occur when fuel is injected. Accordingly, the length of an intake manifold (not shown) of the engine head 100 can be decreased. That is, according to this structure, a compact structure can be achieved.

[0041] Further, as shown in FIG. 4, an avoiding groove 331 is formed at an end of the separator 330 to avoid interference with the first injector 500 when fuel is injected. In FIG. 4, unlike the configuration shown in FIG. 3, the first injector 500 may be composed of a plurality of first injectors 500 (e.g., a combined multiple injector type) that have smaller capacity than when the first injector 500 is a single injector 500 (i.e., a singly type injector), as in FIG. 3. A plurality of avoiding grooves 331 are formed at the end of the separator 330 to avoid interference with the plurality of first injectors 500 when fuel is injected. The avoiding grooves 331 may be larger than the fuel boundary T, which is formed when the first injectors 500 inject fuel, to inhibit or prevent the separator 330 from interfering with the injected fuel.

[0042] For example, when one second injector 600 and two first injectors 500 are provided, the first injectors 500 having smaller capacity are disposed in the intake port 300 to improve linearity of fuel in a low-speed period. When an engine is operated in a period where the RPM is very low, one of the first injectors 500 is operated, but in a period with medium RPM, one of the first injectors 500 and the second injector 600, or only the second injector 600 is operated. In particular, in early starting or idling, it is possible to accurately control fuel according to the amount of air, without a loss of fuel, by using the first injectors 500. The first injectors 500 both inject fuel to the intake port 300 and may be mounted in the engine head 100 or the intake manifold.

[0043] The present disclosure can be applied to a system having both MPI and GDI types, and particularly, and to the intake port 300 and the engine head 100 where a VTS (Variable Tumble System) is applied. The first injector 500, second injector 600, separator 330, and blade 400 may be for MPI, GDI, VTS, and VCM (Variable Charge Motion), respectively.

[0044] Therefore, according to the fuel injection unit for an internal combustion engine of the present disclosure, it is possible to improve PN by using both of MPI and GDI, inhibit or prevent fuel wall-wetting, improve fuel efficiency, and reduce EM by modulating VCM and VTS and positioning MPI behind VTS.

[0045] Further, an MPI+VTS+GDI system can be achieved in a compact structure, so design can be less restricted, the operation speed is increased in comparison to the mechanical type by driving VCM with a motor, and combustion can be stably performed by mapping an engine with exact prediction of the point of time where tumble starts increasing.

[0046] Further, it is possible to reduce a loss of fuel and accurately control fuel according to the amount of air by using a plurality of MPD injectors having relative small capacity.

[0047] Although the present disclosure was described with reference to specific forms shown in the drawings, it is apparent to those skilled in the art that the present disclosure may be changed and modified in various ways without departing from the scope of the present disclosure.