KR20150062504A - Apparatus for driving the high pressure fuel pump - Google Patents

Apparatus for driving the high pressure fuel pump Download PDF

Info

Publication number
KR20150062504A
KR20150062504A KR1020130147231A KR20130147231A KR20150062504A KR 20150062504 A KR20150062504 A KR 20150062504A KR 1020130147231 A KR1020130147231 A KR 1020130147231A KR 20130147231 A KR20130147231 A KR 20130147231A KR 20150062504 A KR20150062504 A KR 20150062504A
Authority
KR
South Korea
Prior art keywords
pump
fuel
pressure
lobe
height
Prior art date
Application number
KR1020130147231A
Other languages
Korean (ko)
Inventor
김대훈
Original Assignee
주식회사 현대케피코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 현대케피코 filed Critical 주식회사 현대케피코
Priority to KR1020130147231A priority Critical patent/KR20150062504A/en
Publication of KR20150062504A publication Critical patent/KR20150062504A/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D1/00—Controlling fuel-injection pumps, e.g. of high pressure injection type
    • F02D1/02—Controlling fuel-injection pumps, e.g. of high pressure injection type not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/30—Varying fuel delivery in quantity or timing with variable-length-stroke pistons

Landscapes

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

Abstract

An apparatus for controlling fuel pressure through hardware modification to the assembly structure of a high-pressure pump is disclosed. A high-pressure fuel pump driving apparatus according to one aspect of the present invention is a high-pressure fuel pump driving apparatus including a plunger that pressurizes a fuel while reciprocating up and down according to the operation of a pump lobe, A control means for variably determining a height of the pump lobe based on a target time which is a time required to form the pump lobe so that the pump lobe corresponding to the height determined by the control means induces a vertical reciprocating motion of the plunger, And pump lobe changing means for changing the height of the pump lobe.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly structure of a high-pressure pump and a high-pressure pump, and more particularly, to a technique of controlling fuel pressure through hardware modification to an assembly structure of a high-pressure pump.

2. Description of the Related Art Generally, a high-pressure fuel pump installed in an automobile is a device for supplying fuel to an engine at a high pressure by the driving force of the engine. Generally, the high-pressure fuel pump is driven by the rotational force of the engine.

The operation of a conventional high-pressure fuel pump will now be described with reference to the accompanying drawings. 1 is a view for explaining the operation of a conventional high-pressure fuel pump.

The camshaft 40 connected to the crankshaft 20 and the belt 30 (or chain) rotates as the crankshaft 20 of the engine 10 rotates. At this time, the piston 120 of the high-pressure fuel pump 100 rises by the cam 50 formed on the camshaft 40, and the piston 120 is lowered by the return spring 170 to be injected into the chamber 180 The high-pressure fuel is discharged to the discharge port 160, and the high-pressure fuel is supplied to the engine 10. At this time, the injection port 140 of the high-pressure fuel pump 100 is provided with a solenoid valve 60 for controlling injection of fuel.

On the other hand, the high-pressure fuel discharged through the discharge port 160 is subjected to a fuel pressure control process in a high-pressure regulator (not shown), then supplied to the fuel rail and injected into the engine via the fuel injection nozzle. At this time, the fuel pressure control was performed through a simple feedback control process without hardware modification to the high pressure fuel pump. However, if a hardware modification is not accompanied, a large frictional loss is generated in the driving force transmitting means such as the engine 10, the crankshaft 20, the belt 30 and the camshaft 40 even when the low fuel pressure is generated. I can not help it. This leads directly to the torque loss of the vehicle and can adversely affect the fuel economy, performance and environmental pollution of the vehicle.

The present invention provides a high-pressure fuel pump drive apparatus for preventing frictional loss and torque loss of a drive force transmitting means by controlling fuel pressure with hardware deformation of a high-pressure fuel pump in order to solve the problems of the above-described conventional techniques .

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a high-pressure fuel pump driving apparatus including a plunger that pressurizes a fuel while reciprocally moving up and down according to an operation of a pump lobe, A control means for variably determining a height of the pump lobe on the basis of a set target fuel pressure and a target time which is a time required until the target fuel pressure is formed and a pump lobe corresponding to a height determined by the control means And pump lobe changing means for changing the height of the pump lobe so as to induce up-and-down reciprocating motion of the plunger.

 According to a preferred embodiment, the pump lobe is formed integrally with the camshaft by configuring a pump lobe set having various heights, and the pump lobe changing means moves the camshaft in the left-right direction, So that the pump lobe induces the reciprocating motion of the plunger.

 On the other hand, the high-pressure fuel pump driving apparatus according to the present invention further comprises a memory unit storing a look-up table in which the target fuel pressure, the target time and the identification number of the pump lobe required are recorded, The height of the pump lobes and the position on the camshaft are distinguished from each other.

Further, the control means knows the identification number of the pump lobe leading the up-and-down reciprocating motion of the plunger at the first time point, and determines the look-up table according to the target fuel pressure and target time required at the second time point To determine the corresponding pump lobe.

According to the present invention as described above, friction loss and torque loss of the driving force transmitting means can be prevented by controlling the fuel pressure with the hardware deformation of the high-pressure fuel pump.

1 is a view for explaining the operation of a conventional high-pressure fuel pump;
2 is a schematic diagram of a fuel system of a GDI engine according to an embodiment of the present invention.
3 illustrates a structure of a high-pressure pump in a fuel system of a GDI engine according to an embodiment of the present invention.
FIG. 4 is a view showing a pump lobe set having a variable length integrally formed with a camshaft in a high-pressure fuel pump driving apparatus according to an embodiment of the present invention; FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The present invention proposes a technique for controlling the timing of reaching a target fuel pressure in a high-pressure fuel pump by applying a hardware modification to a high-pressure fuel pump drive apparatus in a fuel supply system of a gasoline direct injection engine. In order to explain this, the operation principle of the fuel system of the GDI engine and the structure of the high-pressure pump in the fuel system of the GDI engine will be schematically described with reference to FIGS. 2 and 3.

GDI  Engine fuel system

The fuel system of the GDI engine is equipped with a low pressure pump 210 which is operated as a motor to supply fuel to the fuel rail 400 and a high pressure pump 300 operated by the camshaft, And is mounted on the cover 220.

An injector 410 for injecting the calculated amount of fuel into each of the combustion chambers is mounted and at the end of the fuel rail 400 is detected the pressure inside the fuel rail 400, A pressure sensor 420 is mounted.

Accordingly, the fuel supplied from the fuel tank 200 to the engine by the operation of the low-pressure pump 210 is pressurized to a predetermined pressure set by the high-pressure pump 300 operated by the camshaft, to about 120 bar, .

At this time, the pressure sensor 420 mounted on the end of the fuel rail 400 detects the pressure formed on the fuel rail 400 and applies the detected pressure to the engine control means (not shown).

Therefore, the engine control means performs the fuel pressure feedback (feed back) control so as to maintain the optimum pressure according to the operating condition.

Structure of high pressure pump

The high pressure pump 300 includes a plunger 301, a pump lobe 600 integrally formed with the cam shaft, a control valve 320, and a solenoid 330.

The high pressure pump 300 is a positive displacement pump in which the plunger 310 presses the fuel while reciprocating vertically in accordance with the operation of the pump lobe 600. The maximum discharge flow rate per stroke corresponds to the volume trajectory created by the plunger 310 do.

Since the fuel is delivered only when the control valve 320 is closed, the engine control means (not shown) controls the discharge amount of the fuel by adjusting the closing time of the control valve 320 through the solenoid 330.

For example, when the target fuel pressure is determined in the specific operating condition determined by the engine speed and the load, the engine control means (not shown) adjusts the closing time of the control valve 320 through the solenoid 330, 40, feedback control is performed so that the target fuel pressure is formed.

In order to maintain the fuel pressure formed on the fuel rail 400 at the target fuel pressure determined according to the operating conditions, the fuel is continuously supplied through the operation of the high-pressure pump 300 by the fuel amount injected to the injector 410.

If the supply amount through the high-pressure pump 300 exceeds the injection amount by the injector 410, the pressure inside the fuel rail 400 is raised, and in the opposite case, the pressure inside the fuel rail 400 is reduced.

Therefore, the engine control means adjusts the closing timing of the control valve 320 mounted on the high-pressure pump 300 according to the pressure of the fuel rail 400 detected through the pressure sensor 420, Maintain fuel pressure at all times.

The high-pressure fuel pump drive device

The high-pressure fuel pump driving apparatus according to the present invention may be used in combination with the fuel pressure control method for adjusting the closing time of the control valve 320 through the solenoid 330 described above so that the target fuel pressure is formed, There is provided a method of controlling a timing at which a target fuel pressure is formed by controlling the speed of reciprocating motion of the plunger 310 when the plunger 310 presses the fuel while reciprocating upward and downward.

The vertical movement of the plunger 310 depends on the operation of the pump lobe 600 which is integrally formed with the camshaft. In the present invention, the height of the pump lobe 600, which induces the reciprocating motion of the plunger 310, a method of varying the lift of the plunger 310 according to circumstances and changing the speed of the reciprocating motion of the plunger 310 is used. An embodiment for this purpose will be described with reference to FIG. 4 is a view showing a pump lobe set having a variable length integrally formed with a cam shaft in a high-pressure fuel pump driving apparatus according to an embodiment of the present invention.

4, a set of pump lobes 600-1, ..., 600-n having various heights is integrally formed with the cam shaft 700, and the cam shaft position changing means 800 The camshaft 700 moves in the left and right direction to change the pump lobe that induces the reciprocating motion of the plunger 310. [ For example, the camshaft position changing means may change the position of the camshaft 700 to the left or right direction by an electric or hydraulic method.

If the vehicle climbs up a steep hill or is in a rapid acceleration situation, it should generate the necessary power quickly. As a means for this purpose, the present invention changes the position of the camshaft 700 to the left and right direction so that the target fuel pressure can be formed within a short time, and the pump lobe having a large height induces the reciprocating motion of the plunger 310 .

On the other hand, if the vehicle does not require high power within a short time, the position of the cam shaft 700 is changed to the left and right so that the pump lobe having a small height can induce the reciprocating motion of the plunger 310.

That is, the present invention is characterized in that it provides a means for controlling the timing at which the target fuel pressure is formed by changing the height of the pump lobe 600 that induces the reciprocating motion of the plunger 310 .

In order to realize this, although not shown, the engine control means selects a pump lobe to be used with reference to a look-up table in which a target fuel pressure and a target time at which the target fuel pressure is formed are recorded.

For example, the position of each pump lobe 600-1, ..., 600-n in the set of pump lobes 600-1, ..., 600-n integrally formed with the cam shaft 700 is For example, the identification number of the pump lobe and the position of each pump lobe are stored together in the look-up table. The engine control means knows the identification number of the pump lobe leading up and down reciprocating movement of the plunger 310 at present and refers to the look-up table, Search the lobes.

Then, the engine control means controls the camshaft position changing means 800 so that the searched pump lobe can induce the reciprocating motion of the plunger 310.

As another embodiment, a method using a lobe height changing means capable of variably changing the height of the pump lobe 600, which is integrally formed with the camshaft, is used.

For example, the pump lobe may consist of one or more lobes having a constant height, and the lobe height changing means may vary the height of each of the lobs hydraulically or electromagnetically. The change control of the lobe height may use a look-up table. The control for changing the lobe height using the look-up table is the same as that for the cam shaft position change control method described above, so a detailed description thereof will be omitted.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (4)

A high-pressure fuel pump drive apparatus comprising a plunger for pressurizing a fuel while reciprocating up and down according to an operation of a pump lobe,
Control means for variably determining a height of the pump lobe based on a set target fuel pressure and a target time which is a time required until the target fuel pressure is formed;
A pump lobe changing means for changing a height of the pump lobe so that a pump lobe corresponding to a height determined by the control means induces a vertical reciprocating motion of the plunger;
Pressure fuel pump.
The method according to claim 1,
The pump lobe is formed integrally with the cam shaft by constituting a set of pump lobes 600-1, ..., 600-n having various heights,
The pump lobe changing means moves the camshaft in the left-right direction to cause the pump lobe corresponding to the determined height to induce the reciprocating motion of the plunger
High pressure fuel pump drive.

3. The method of claim 2,
Up table in which the target fuel pressure, the target time, and the identification number of the pump lobe required accordingly are recorded,
The height of the pump lobes and the position on the camshaft in accordance with the identification number
High pressure fuel pump drive.
3. The apparatus according to claim 2,
Up table is referred to in accordance with the target fuel pressure and the target time required at the second time point and the number of the pump lobes for which the plunger is reciprocated by the pump lobe To determine
High pressure fuel pump drive.
KR1020130147231A 2013-11-29 2013-11-29 Apparatus for driving the high pressure fuel pump KR20150062504A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130147231A KR20150062504A (en) 2013-11-29 2013-11-29 Apparatus for driving the high pressure fuel pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130147231A KR20150062504A (en) 2013-11-29 2013-11-29 Apparatus for driving the high pressure fuel pump

Publications (1)

Publication Number Publication Date
KR20150062504A true KR20150062504A (en) 2015-06-08

Family

ID=53500507

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020130147231A KR20150062504A (en) 2013-11-29 2013-11-29 Apparatus for driving the high pressure fuel pump

Country Status (1)

Country Link
KR (1) KR20150062504A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2571934A (en) * 2018-03-12 2019-09-18 Delphi Automotive Systems Lux High pressure multi-mode fuel pump system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2571934A (en) * 2018-03-12 2019-09-18 Delphi Automotive Systems Lux High pressure multi-mode fuel pump system

Similar Documents

Publication Publication Date Title
US10316785B2 (en) Apparatus and method for controlling flow control valve for high pressure fuel pump
KR101603643B1 (en) Control appartus and mehtod of flow control valve for high presure fuel pump
US7013872B2 (en) Fuel injector for internal combustion engine
EP2453122B1 (en) Method and control apparatus for controlling a high-pressure fuel supply pump configured to supply pressurized fuel to an internal combustion engine
EP2063100A2 (en) Fuel pump control for a direct injection internal combustion engine
EP1598549B1 (en) Method for the direct injection of fuel into an internal combustion engine
US10655614B2 (en) Device for controlling high-pressure pump
US7422002B2 (en) Method and apparatus for controlling a fuel injection system for an internal combustion engine in a vehicle
EP1598548A1 (en) Method and system for the direct injection of fuel into an internal combustion engine
US10890176B2 (en) Control device for high pressure pump
KR20010021122A (en) High-pressure fuel pump and cam for high-pressure fuel pump
US9671033B2 (en) Method and apparatus for controlling a solenoid actuated inlet valve
US9874185B2 (en) Direct injection pump control for low fuel pumping volumes
CN107366585B (en) Method for controlling a fuel pump for a direct injection system
CN113494400A (en) System and method for direct injection fuel pump control
KR20150062504A (en) Apparatus for driving the high pressure fuel pump
US20130000602A1 (en) Methods and systems for controlling fuel systems of internal combustion engines
JP5141724B2 (en) High pressure pump control device
JP5648620B2 (en) High pressure fuel pump
JP5093132B2 (en) High pressure pump control device
EP2896814B1 (en) Fuel-injection controller for engine
KR101623679B1 (en) Hydraulic-drive fuel injection device and internal combustion engine
JP6329092B2 (en) Control device for internal combustion engine
JP2006170097A (en) Fuel pump
US20180306173A1 (en) Hydraulic drive system for a linearly actuated hydraulic piston pump

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
AMND Amendment
E601 Decision to refuse application
AMND Amendment
E801 Decision on dismissal of amendment