KR20170074104A - Low-pressure and High-pressure Fuel Injection System - Google Patents

Low-pressure and High-pressure Fuel Injection System Download PDF

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Publication number
KR20170074104A
KR20170074104A KR1020150183202A KR20150183202A KR20170074104A KR 20170074104 A KR20170074104 A KR 20170074104A KR 1020150183202 A KR1020150183202 A KR 1020150183202A KR 20150183202 A KR20150183202 A KR 20150183202A KR 20170074104 A KR20170074104 A KR 20170074104A
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South Korea
Prior art keywords
low
pressure
pressure fuel
fuel
module
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KR1020150183202A
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Korean (ko)
Inventor
이상률
이준혁
심명섭
김동섭
허재혁
윤희준
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(주)모토닉
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Priority to KR1020150183202A priority Critical patent/KR20170074104A/en
Publication of KR20170074104A publication Critical patent/KR20170074104A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/005—Arrangements of fuel feed-pumps with respect to fuel injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0275—Arrangement of common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A low-pressure or high-pressure fuel injection system, comprising: a low-pressure fuel supply module installed in a fuel tank to pump stored fuel; A low pressure fuel injection module installed in the cylinder so as to inject low pressure fuel supplied from the low pressure fuel supply module; A low-pressure fuel supply line installed between the low-pressure fuel supply module and the low-pressure fuel injection module to supply low-pressure fuel to the low-pressure fuel supply module; A fuel pressure boosting module for switching the low pressure fuel supplied from the low pressure fuel supply line to a high pressure; And a high-pressure fuel injection module installed in the cylinder to inject the high-pressure fuel supplied from the fuel pressure-up module. The low-pressure fuel and the high-pressure fuel can be separately used in one engine, Pressure or high-pressure fuel can be freely selected and used depending on the running speed or the output condition of the vehicle, and the effect that the low-pressure fuel can be quickly switched to the high pressure can be obtained.

Figure P1020150183202

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a low-pressure or high-pressure fuel injection system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-pressure or high-pressure fuel injection system, and more particularly to a low-pressure or high-pressure fuel injection system that uses high-pressure fuel or low-pressure fuel according to the driving conditions or conditions of a vehicle.

Generally, the engine of a vehicle includes a method of injecting fuel to an intake valve and a method of injecting fuel directly to a combustion chamber, and in addition, a mixture of air and fuel is used in various ways.

MPI (Multi Point Injection) fuel injection system mixes air and fuel and supplies it to the combustion chamber, which is burned in the cylinder. It is fuel multipurpose engine and mainly used in gasoline engine.

In addition, the GDI (Gasoline Direct injection) fuel injection system injects fuel directly into the cylinder while injecting air into the cylinder, and is used as a direct injection gasoline engine.

MPI has a structure that is simpler than GDI and has a merit that the overall weight of the engine is light, while the efficiency of the fuel is inferior. In order to increase fuel efficiency, which is a disadvantage of the MPI engine, a direct injection engine is being developed.

Although this GDI fuel system has the advantage of increasing the output, which is a disadvantage of the MPI fuel system, a high-pressure fuel pump is used to feed the fuel to the fuel tank in order to increase the efficiency of the fuel. The efficiency of the fuel economy is deteriorating due to the high load on the camshaft.

A schematic structure of a fuel supply system of a GDI (gasoline direct injection) engine is shown in FIG. 1, which is roughly divided into a low-pressure system and a high-pressure system.

As shown in FIG. 1, the low-pressure system includes a low-pressure pump 1 and a fuel pump relay 3, and the low-pressure pump 1 is located inside the fuel tank and delivers fuel to the high- The high-pressure system includes a high-pressure regulating valve 8, a high-pressure pump 5, a pressure sensor 6, and an injector 7.

The high-pressure pump 5 is connected to a camshaft or the like of the engine and compresses the fuel supplied from the low-pressure system to raise it to a required pressure. The injector 7 directly injects high-pressure fuel into the combustion chamber.

In the low-pressure system, the ECU 4 operates the fuel pump relay 3 to drive the low-pressure pump 10 at the moment when the driver starts the engine, and the fuel in the tank is sent to the high-pressure pump 5. The low-pressure pump 1 is always driven while the engine is rotating, and maintains a pressure of about 4 to 5 bar by the fuel pressure regulator.

The fuel delivery amount of the low-pressure pump 1 is designed to satisfy the maximum output operating condition of the engine.

On the other hand, in the high-pressure system, the high-pressure pump 5 driven by the camshaft or the like adjusts the opening and closing timing of the high-pressure regulating valve 5 to raise the fuel pressure to about 30 to 150 bar according to the operating conditions. The ECU 4 changes the amount of fuel remaining in the inner chamber of the high-pressure pump 5 by measuring the fuel pressure with the pressure sensor 6 and adjusting the closing timing of the high-pressure regulating valve 8, Pressure can be formed.

In the gasoline direct injection engine, the actual fuel pressure does not fall rapidly during the high fuel pressure drop during operation under high load conditions. The amount of fuel injected due to the excess fuel pressure is excessive, and an instantaneous rich mixture is formed, .

Such a conventional fuel injection system has a problem in that it is not possible to raise the fuel efficiency because the low pressure fuel pressure is injected in order to inject the high pressure fuel.

For example, Patent Document 1 below discloses a fuel supply system and a fuel supply method for a gasoline direct injection engine.

A fuel supply system and a fuel supply method of a gasoline direct injection engine according to Patent Document 1 include a low-pressure pump, a high-pressure pump for injecting fuel from the low-pressure pump and compressing fuel, a low-pressure pump line for connecting the low- And a fuel injector connected to the high-pressure pump and injecting high-pressure fuel directly into the combustion chamber, the fuel supply system comprising: a bypass valve connected between the high-pressure pump and the injector, And a bypass line connected to the low-pressure pump line.

Korean Patent Publication No. 10-2012-0063298 (published on June 15, 2012) Korean Patent Publication No. 10-2014-0078439 (published on June 25, 2014) Korean Patent Publication No. 10-2014-0057429 (published on May 13, 2014)

However, the fuel injection system according to the related art has a problem that a high-pressure pump, a high-pressure regulating valve, a pressure sensor, and the like are provided for supplying a low-pressure fuel at a high pressure. This causes the weight of the engine to become heavy, There was a problem.

An object of the present invention is to provide a low-pressure or high-pressure fuel injection system capable of supplying a low pressure or a high pressure to each fuel rail so as to separately supply a low-pressure fuel and a high- will be.

Another object of the present invention is to provide a low-pressure or high-pressure fuel injection system in which a fuel rail for supplying a low pressure to a cylinder and a fuel rail for supplying a high pressure can selectively supply a low pressure or a high pressure.

According to an aspect of the present invention, there is provided a low-pressure or high-pressure fuel injection system comprising: a low-pressure fuel supply module installed in a fuel tank to pump stored fuel; A low pressure fuel injection module installed in the cylinder so as to inject low pressure fuel supplied from the low pressure fuel supply module; A low-pressure fuel supply line installed between the low-pressure fuel supply module and the low-pressure fuel injection module to supply low-pressure fuel to the low-pressure fuel supply module; A fuel pressure boosting module for switching the low pressure fuel supplied from the low pressure fuel supply line to a high pressure; And a high-pressure fuel injection module installed in the cylinder to inject the high-pressure fuel supplied from the fuel pressure-up module.

The low-pressure fuel supply module includes a fuel tank in which fuel is stored; And a low pressure pump installed in the fuel tank to pump the fuel stored in the fuel tank, wherein the low pressure fuel supply line is connected to the low pressure pump.

And the low-pressure fuel injection module is an MPI fuel injection device in which a low-pressure fuel is injected.

The low-pressure fuel supply line is provided with a first flow control valve for selectively interrupting the supply of fuel to the low-pressure fuel injection module, and the low-pressure fuel supply line is provided with a branch line connected to the fuel pressure- And the branch line is provided with a second flow control valve for selectively interrupting the supply of fuel to the fuel pressure boosting module.

The branch line is provided with a damper for reducing the pulsation of the low-pressure fuel supplied by the low-pressure pump, and a second flow control valve for controlling the flow of the low-pressure fuel so that the low-pressure fuel through the damper is supplied to the booster unit Is installed.

The fuel pressure boosting module includes a motor pump driven by an applied power supply; And a boosting unit that is reciprocated by the motor pump to switch the low-pressure fuel supplied from the low-pressure fuel supply line to a high pressure.

Pressure fuel supply line installed between the booster unit and the high-pressure fuel injection module; And a first check valve installed in the high-pressure fuel supply line to supply high-pressure fuel, which has been switched to high pressure in the pressure-rising unit, to the high-pressure fuel injection module.

The high-pressure fuel supply line includes a bypass line installed to be supplied to the boosting unit so that the pressure of the high-pressure fuel boosted by the boosting unit is raised to a higher pressure; And a second check valve installed on the bypass line to prevent the fuel in the bypass line from flowing backward.

And the high-pressure fuel injection module is a GDI fuel injection device in which a high-pressure fuel is injected.

As described above, according to the low-pressure or high-pressure fuel injection system of the present invention, it is possible to separately use the low-pressure and high-pressure fuel in one engine, to easily switch the low-pressure fuel to high pressure, It is possible to freely select and use low-pressure or high-pressure fuel according to the speed or output condition, and it is possible to quickly switch the low-pressure fuel to the high pressure.

According to the low-pressure or high-pressure fuel injection system of the present invention, the low-pressure fuel can be switched to the high-pressure fuel by the motor pump and the boosting unit, Pressure fuel can be easily obtained without increasing the weight of the fuel.

1 is a view showing a conventional direct injection type fuel injection system,
FIG. 2 is a view showing a low-pressure or high-pressure fuel injection system according to a preferred embodiment of the present invention;
FIG. 3 is a fuel flow diagram showing a state in which high-pressure fuel is supplied to a low-pressure or modified fuel injection system according to a preferred embodiment of the present invention.

Hereinafter, a low-pressure or high-pressure fuel injection system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a configuration diagram showing a low-pressure or high-pressure fuel injection system according to a preferred embodiment of the present invention.

The low-pressure or high-pressure fuel injection system according to the preferred embodiment of the present invention includes a low-pressure fuel supply module 10 installed in the fuel tank 11 to pump the stored fuel, a low-pressure fuel supply module 10 provided in the low- Pressure fuel injection module 20 installed in the cylinder so that low-pressure fuel is supplied to the low-pressure fuel supply module 10, and a low-pressure fuel injection module 20 installed in the cylinder so that low- Pressure fuel supply line 30, a fuel pressure-increasing module 40 for switching low-pressure fuel supplied from the low-pressure fuel supply line 30 to a high pressure, And a high-pressure fuel injection module 50 installed in the cylinder.

The low-pressure or high-pressure fuel injection system according to the embodiment of the present invention allows the low-pressure fuel to be injected from the low-pressure fuel injection module 20 and the high-pressure fuel to be injected from the high-pressure fuel injection module 50, respectively.

The low-pressure fuel injection module 20 and the high-pressure fuel injection module 50 are respectively installed in a cylinder (not shown) of the engine. The low-pressure fuel injection module 20 is composed of an MPI fuel injection device, (50) is composed of a GDI fuel injection device.

In such a cylinder, an injector for MPI and an injector for GDI may be installed at different positions, respectively. That is, an injector (not shown) such as the MPI engine is installed in the cylinder in front of the intake valve, and the injector is installed at the rear end of the intake valve like the GDI engine.

In such a cylinder, two injectors are used to apply a more efficient MPI fuel injection system for low-pressure fuel and a more efficient GDI fuel injection system for high-pressure fuel.

The low-pressure or high-pressure fuel injection system according to the embodiment of the present invention uses low-pressure fuel when low-speed running or high output is not required, and uses high-pressure fuel when high-speed running or high output is required.

2, a low-pressure or high-pressure fuel injection system is provided with a low-pressure pump 12 for pumping the fuel stored in the fuel tank 11, and the fuel pumped by the low- Is supplied to the module (20).

The fuel pumped in the low pressure pump 12 is supplied to the fuel pressure increasing module 40 to be switched to the high pressure in the fuel pressure increasing module 40 and the high pressure fuel converted to the high pressure is supplied to the high pressure fuel injection module 50.

Pressure fuel supply line 30 is connected to the low-pressure fuel injection module 20 so that low-pressure fuel is supplied between the low-pressure pump 12 and the low-pressure fuel injection module 20, do.

The low-pressure fuel supply line 30 is provided with a filter 13 for filtering foreign substances contained in the fuel, and a fuel not filtered by the filter 13 between the low-pressure pump 12 and the filter 13, A check valve 15 is installed so that fuel is not pumped through the bypass line 14 and the bypass line 14 so as to be supplied again to the tank 11.

The low-pressure fuel injection module 20 may use an MPI fuel injection device (not shown) using low-pressure fuel. Such an MPI fuel injection device suffices to use a fuel with a relatively low pressure as compared with a high-pressure fuel injection device (not shown).

A low-pressure fuel supply line 30 is provided between the low-pressure pump 12 and the low-pressure fuel injection module 20 to supply low-pressure fuel. The low-pressure fuel supply line 30 may be provided with a first flow control valve 31 capable of shutting off fuel supply to the low-pressure fuel injection module 20.

The first flow control valve 31 is controlled by the engine control unit (ECU) 60, and opens the first flow control valve 31 when the low-pressure fuel is used. When the low-pressure fuel is not used The first flow control valve 31 is closed.

The low-pressure fuel supply line 30 is provided with a branch line 32 for supplying fuel to the high-pressure fuel injection module 50. The branch line 32 is connected to the low-pressure fuel supply line 30 so as to supply fuel to the high-pressure fuel injection module 50.

The branch line 32 is provided with a second flow control valve 33 for shutting off the supply of low-pressure fuel when the high-pressure fuel injection module 50 is not used. The second flow control valve 33 is opened when the high-pressure fuel injection module 50 is used, and remains closed when the high-pressure fuel injection module 50 is not used.

The second flow control valve 33 opens and closes the branch line 32 by an electrical signal of the engine control device 60.

The second flow control valve 33 is driven by an applied signal and is provided with a spring 33a for restoring to one side thereof and a flow rate control valve 33a for controlling the flow rate of the low- A valve 33b is incorporated.

The branch line (32) is provided with a damper (34) for reducing the pulsation of the low-pressure fuel. The damper 34 reduces the pulsation generated in the low-pressure fuel, thereby allowing the low-pressure fuel to be more stably supplied to the fuel lift module 40.

This damper 34 slows down the flow rate of the low-pressure fuel and flows it in a stabilized state.

The branch line (32) is provided with a fuel pressure increasing module (40) for switching the low pressure fuel pumped by the low pressure pump (12) to a high pressure. The fuel pressure boosting module 40 includes a motor pump 41 driven by an applied power source and a boosting unit 42 driven by the motor pump 41.

The fuel pressure boosting unit 40 is supplied with the low pressure fuel supplied from the low pressure fuel supply line 10 and converts the low pressure fuel into the high pressure fuel in the pressure increasing unit 42 reciprocating by driving the motor pump 41 .

A high-pressure fuel supply line 43 is connected between the up-converter 42 and the high-pressure fuel injection module 50, and the high-pressure fuel discharged from the voltage-up unit 42 is supplied to the high- A first check valve 44 is provided.

Further, a bypass line 45 is connected to the high-pressure fuel supply line 43 so that a part of the high-pressure fuel is transferred to the boosting unit 42. A second check valve (46) is provided in the bypass line (45) so that the high pressure fuel is moved only to the pressure increasing unit (42).

The high-pressure fuel injection module 50 may use a GDI fuel injection device (not shown) using high-pressure fuel.

2 and 3, a method of operating a low-pressure or high-pressure fuel injection system according to a preferred embodiment of the present invention will be described in detail.

As shown in FIGS. 2 and 3, the low-pressure or high-pressure fuel injection system according to the embodiment of the present invention pumps the fuel by the low-pressure pump 12 installed in the fuel tank 11.

The fuel thus pumped is supplied to the low-pressure fuel injection module 20, and the low-pressure fuel pumped in the low-pressure pump 12 is supplied to the low-pressure fuel injection module 20 through the low-pressure fuel supply line 30. [

The low-pressure fuel injection module 20 is supplied to each cylinder (not shown) of the gasoline engine and is injected. The low-pressure fuel injection module 20 may use an MPI fuel injection device that injects low-pressure fuel.

The low-pressure fuel injection module 20 is driven when the running speed of the vehicle is low. In the engine control unit 60, the low-pressure fuel injection module 20 injects the fuel until the speed reaches a constant speed after starting the vehicle Thereby driving the engine.

That is, the engine control unit 60 controls whether the low-pressure fuel injection module 20 or the high-pressure fuel injection module 50 is driven according to the traveling speed of the vehicle measured from the speed sensor 61 installed in the vehicle .

When the running speed of the vehicle is approximately 40 to 60 km per hour or less, the engine control unit 60 can drive the engine using the low-pressure fuel supplied from the low-pressure fuel injection module 20. [

Further, when the running speed of the vehicle is about 40 to 60 km or more per hour, the engine control device 60 can drive the engine using the high-pressure fuel supplied from the high-pressure fuel injection module 50.

At this time, the first flow control valve 31 provided in the low-pressure fuel supply line 30 is kept open by the engine control unit 60, and when the low-pressure fuel injection module 20 is not used, The flow control valve 31 is kept closed by the engine control device 60. [

On the other hand, the engine control unit 60 causes the low-pressure fuel supplied from the low-pressure pump 12 to be supplied to the high-pressure fuel injection module 50 when the running speed of the vehicle rises above a set value.

The engine control device 601 opens the second flow control valve 33 provided in the branch line 32 when the running speed of the vehicle measured by the speed sensor 61 approaches the set value.

Thus, the engine control device 60 can open the second flow control valve 33 in advance. This is to enable the pressure of the high-pressure fuel required by the high-pressure fuel injection module 50 to be sufficiently raised while securing the time required for switching the low-pressure fuel to the high pressure in the boosting unit 42. [

Pressure fuel supply line 30 by the first flow control valve 31 provided in the low-pressure fuel supply line 30 in a state in which the high-pressure fuel can be used by the step-up unit 42, .

3 is a fuel flow diagram illustrating a state in which high-pressure fuel is supplied to a fuel injection system of low pressure or designed according to a preferred embodiment of the present invention.

As shown in Fig. 3, the fuel pumped in the low-pressure pump 12 is supplied to the branch line 32 branched in the low-pressure fuel supply line 30. [ At this time, power is applied to the second flow control valve 33 by the engine control device 60, and the second flow control valve 33 is closed by the flow control valve 33b, 32 so as to connect the branch line 32.

 The low-pressure fuel supplied to the branch line 32 is supplied to the step-up unit 42 by reducing the pulsation of the low-pressure fuel by the damper 34 and stabilizing the low-pressure fuel.

The low pressure fuel supplied to the branch line 32 is supplied to the pressure increasing unit 42 via the damper 34 and the second flow control valve 33. The low pressure fuel introduced into the pressure increasing unit 42 is supplied to the motor pump 41 and the voltage step-up unit 42 are switched from a low voltage to a high voltage.

The high-pressure fuel converted into the high pressure is delivered to the high-pressure fuel injection module 50 along the high-pressure fuel supply line 43, and the high-pressure fuel injection module 50 injects the high-pressure fuel to obtain the engine output.

A part of high-pressure fuel fed through the first check valve 44 is supplied to the high-pressure fuel supply line 43 again inside the pressure-up unit 42. The high-pressure fuel supplied to the pressure- Pressure fuel to the high-pressure fuel injection module 50 as well as to switch the low-pressure fuel conveyed to the high-pressure fuel injection module 42 to the high-pressure fuel more quickly.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

10: low pressure fuel supply module 11: fuel tank
12: Low pressure pump 13: Filter
14: bypass line 15: check valve
20: Low pressure fuel injection module 30: Low pressure fuel supply line
31: first flow control valve 32: branch line
33: second flow control valve 33a: spring
33b: Flow control valve 34: Damper
40: Fuel boost module 41: Motor pump
42: step-up unit 43: high-pressure fuel supply line
44: first check valve 45: bypass line
46: second check valve 50: high pressure fuel injection module
60: Engine control device 61: Speed sensor

Claims (10)

A low pressure fuel supply module installed in the fuel tank to pump the stored fuel;
A low pressure fuel injection module installed in the cylinder so as to inject low pressure fuel supplied from the low pressure fuel supply module;
A low-pressure fuel supply line installed between the low-pressure fuel supply module and the low-pressure fuel injection module to supply low-pressure fuel to the low-pressure fuel supply module;
A fuel pressure boosting module for switching the low pressure fuel supplied from the low pressure fuel supply line to a high pressure;
And a high-pressure fuel injection module installed in the cylinder for injecting high-pressure fuel supplied from the fuel pressure-up module. A low pressure fuel supply module installed in the fuel tank to pump the stored fuel;
A low pressure fuel injection module installed in the cylinder so as to inject low pressure fuel supplied from the low pressure fuel supply module;
A low-pressure fuel supply line installed between the low-pressure fuel supply module and the low-pressure fuel injection module to supply low-pressure fuel to the low-pressure fuel supply module;
A fuel pressure boosting module for switching the low pressure fuel supplied from the low pressure fuel supply line to a high pressure;
And a high-pressure fuel injection module installed in the cylinder for injecting high-pressure fuel supplied from the fuel pressure-up module,
Pressure fuel supplied from the low-pressure fuel supply module or the low-pressure fuel supplied from the low-pressure fuel supply module selectively injects low-pressure fuel or high-pressure fuel into the high-pressure fuel line converted by the fuel- Fuel injection system. 3. The method according to claim 1 or 2,
The low-pressure fuel supply module includes a fuel tank in which fuel is stored;
And a low pressure pump installed in the fuel tank such that the fuel stored in the fuel tank is pumped,
And the low-pressure pump is connected to the low-pressure fuel supply line. 3. The method according to claim 1 or 2,
Wherein the low-pressure fuel injection module is an MPI fuel injection device in which a low-pressure fuel is injected. 3. The method according to claim 1 or 2,
The low-pressure fuel supply line is provided with a first flow control valve for selectively interrupting fuel supply to the low-pressure fuel injection module,
The low-pressure fuel supply line is connected to a branch line for supplying low-pressure fuel to the fuel pressure-increasing module,
Wherein the branch line is provided with a second flow control valve for selectively interrupting the supply of fuel to the fuel pressure boosting module. 6. The method of claim 5,
The branch line is provided with a damper for reducing the pulsation of the low-pressure fuel supplied by the low-pressure pump,
And a second flow control valve for controlling the flow of the low-pressure fuel so that the low-pressure fuel passing through the damper is supplied to the pressure-rising unit. 3. The method according to claim 1 or 2,
The fuel pressure boosting module includes a motor pump driven by an applied power supply;
And a boosting unit that is reciprocated by the motor pump to convert the low-pressure fuel supplied from the low-pressure fuel supply line to a high-pressure fuel. 8. The method of claim 7,
Pressure fuel supply line installed between the booster unit and the high-pressure fuel injection module;
Further comprising: a first check valve installed in the high-pressure fuel supply line to supply high-pressure fuel converted to a high pressure from the booster unit to the high-pressure fuel injection module. 9. The method of claim 8,
The high-pressure fuel supply line includes a bypass line installed to be supplied to the boosting unit so that the pressure of the high-pressure fuel boosted by the boosting unit is raised to a higher pressure;
And a second check valve installed on the bypass line to prevent fuel in the bypass line from flowing backward. 3. The method according to claim 1 or 2,
Pressure fuel injection system, wherein the high-pressure fuel injection module is a GDI fuel injection device in which a high-pressure fuel is injected.
KR1020150183202A 2015-12-21 2015-12-21 Low-pressure and High-pressure Fuel Injection System KR20170074104A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101975824B1 (en) * 2017-11-28 2019-05-08 (주)모토닉 Liquid petroleum-gas direct injection system
KR20210048874A (en) * 2019-10-24 2021-05-04 비테스코 테크놀로지스 코리아 주식회사 Method for protecting fuel injection pump of vehicle and electronic device thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101975824B1 (en) * 2017-11-28 2019-05-08 (주)모토닉 Liquid petroleum-gas direct injection system
KR20210048874A (en) * 2019-10-24 2021-05-04 비테스코 테크놀로지스 코리아 주식회사 Method for protecting fuel injection pump of vehicle and electronic device thereof

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