KR100241037B1 - Electronic control type high pressure fuel injector for diesel engine - Google Patents

Electronic control type high pressure fuel injector for diesel engine Download PDF

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KR100241037B1
KR100241037B1 KR1019970040525A KR19970040525A KR100241037B1 KR 100241037 B1 KR100241037 B1 KR 100241037B1 KR 1019970040525 A KR1019970040525 A KR 1019970040525A KR 19970040525 A KR19970040525 A KR 19970040525A KR 100241037 B1 KR100241037 B1 KR 100241037B1
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South Korea
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fuel
injection
inlet
valve
high pressure
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KR1019970040525A
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Korean (ko)
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KR19990017554A (en
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라진홍
안수길
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안수길
라진홍
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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
    • 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
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/09—Fuel-injection apparatus having means for reducing noise
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in 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
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/07—Nozzles and injectors with controllable fuel supply
    • F02M2700/072—Injection valve actuated by engine for supply of pressurised fuel; Electrically or electromagnetically actuated injectors

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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

본 발명은 디젤기관의 연소실로 분사되는 연료분사의 최적제어시스템을 구성하기 위하여 전자제어가 가능하며 응답특성이 양호한 디젤기관용 전자제어식 고압연료분사기에 관한 것이다.The present invention relates to an electronically controlled high-pressure fuel injector for a diesel engine which is electronically controllable and has a good response characteristic in order to construct an optimal control system for fuel injection injected into a combustion chamber of a diesel engine.

디젤기관운전에서 사회적 문제가 되고 있는 것은 질소산화물과 그을음등의 공해물질 배출이다. 이를 감소시키기 위하여 많은 연구가 범세계적으로 진행되고 있다.The social problem in diesel engine operation is the emission of pollutants such as nitrogen oxides and soot. To reduce this, a lot of research is being carried out worldwide.

이와 같은 문제점을 동시에 만족시킬 수 있는 방법은 연료의 고압분사화와 연료분사의 최적제어이다.A method that can satisfy these problems at the same time is the high pressure injection of fuel and the optimum control of fuel injection.

캠에 의해 구동되는 기존의 보시식(BOSCH TYPE)은 고압분사에 어려움이 있고, 고압으로 인한 기계적소음과 캠로울러부의 마찰증대에 의한 마모등의 문제가 있었다.Conventional bosch type driven by cam has difficulty in high pressure injection, and there are problems such as mechanical noise due to high pressure and wear caused by increased friction of cam roller part.

또한 연료분사의 최적화는 기관회전수와 부하등 기관운전조건에 따라 분사시기와 최적의 분사량을 요구하게 되는 바, 디젤기관의 연료분사시스템에서 현재까지는 분사시기의 경우 원심식 또는 부분적 전자방식의 진각장치에 의해 분사량은 기계적 메카니즘에 의해 행해지고 있다.In addition, the optimization of fuel injection requires injection timing and optimum injection quantity according to engine operation conditions such as the engine speed and load.In the fuel injection system of diesel engines, up to now, the centrifugal or partial electronic method is used for injection timing. By the apparatus, the injection amount is performed by a mechanical mechanism.

이러한 방식의 연료분사제어는 고,저부하 및 급가속등 기관의 모든 운전조건에 대응하는데는 한계가 있었다.This type of fuel injection control has a limitation in coping with all operating conditions of the engine such as high, low load and rapid acceleration.

본 발명은 상기와 같은 문제점을 해결하기 위하여 전자에 의해 작동되는 전자밸브(13)와 파핏밸브(10)에 의하여 부스터피스톤(8)에 유압을 가하여 고압을 얻을 수 있도록 함으로서 종래의 캠에 의해 구동되는 보시식(BOSCH TYPE)보다 월등히 높은 200압력(MPa)이상의 고압분사가 가능하고 고압으로 인한 기계적소음과 캠로울러부와 마찰증대에 의한 마모를 해소시킬 수 있음과 아울러 고압화하면서도 전자적으로 연료분사를 최적화하고 기관운전조건에 따른 연료분사가 연소최적화 알고리즘의 시그널에 대해 최고의 응답특성을 갖도록하여 저연비 저공해 가스배출을 실현할 수 있도록 한 디젤기관용 전자제어식 고압연료분사기를 제공할 수 있도록 함에 있다.The present invention is driven by a conventional cam by applying a hydraulic pressure to the booster piston (8) by the solenoid valve 13 and the poppet valve (10) operated by the electron to solve the above problems. High pressure injection of over 200 MPa (MPa), which is much higher than the BOSCH type, is possible, and it is possible to eliminate mechanical noise caused by high pressure and wear caused by cam roller parts and frictional increase. It is possible to provide an electronically controlled high-pressure fuel injector for diesel engines to realize low fuel consumption and low pollution gas emission by optimizing the fuel efficiency and fuel injection according to the engine operating conditions and having the best response to the signal of the combustion optimization algorithm.

Description

디젤기관용 전자제어식 고압연료분사기Electronically controlled high pressure fuel injection machine for diesel engine

본 발명은 디젤기관의 연소실로 분사되는 연료분사의 최적제어시스템을 구성하기 위하여 전자제어가 가능하며 응답특성이 양호한 디젤기관용 전자제어식 고압연료분사기에 관한 것이다.The present invention relates to an electronically controlled high-pressure fuel injector for a diesel engine which is electronically controllable and has a good response characteristic in order to construct an optimal control system for fuel injection injected into a combustion chamber of a diesel engine.

디젤기관운전에서 사회적 문제가 되고 있는 것은 질소산화물과 그을음등의 공해물질배출이다. 이를 감소시키기 위하여 많은 연구가 범세계적으로 진행되고 있따.The social problem in diesel engine operation is the emission of pollutants such as nitrogen oxides and soot. To reduce this, a lot of research is being carried out worldwide.

이와 같은 문제점을 동시에 만족시킬 수 있는 방법은 연료의 고압분사화와 연료분사의 최적제어이다.A method that can satisfy these problems at the same time is the high pressure injection of fuel and the optimum control of fuel injection.

캠에 의해 구동되는 기존의 보시식(BOSCH TYPE)은 고압분에 어려움이 있고, 고압으로 인한 기계적소음과 캠로울러부의 마찰증대에 의한 마모등의 문제가 있었다.Conventional bosch type driven by the cam (BOSCH TYPE) is difficult to high pressure, there are problems such as mechanical noise due to high pressure and wear caused by increased friction of the cam roller.

또한, 연료분사의 최적화는 기관회전수와 부하등 기관운전조건에 따라 분사시기와 최적의 분사량을 요구하게 되는 바, 디젤기관의 연료분사시스템에서 현재까지는 분사시기의 경우 원심식 또는 부분적 전자방식의 진각장치에 의해 분사량은 기계적 메카니즘에 의해 행해지고 있다.In addition, the optimization of fuel injection requires injection timing and optimal injection quantity according to engine operation conditions such as engine speed and load.In the fuel injection system of diesel engines, up to now, the injection timing is either centrifugal or partial electronic. The injection amount is carried out by the mechanical mechanism by the mechanism.

이러한 방식의 연료분사제어는 고,저부하 및 급가속등 기관의 모든 운전조건에 대응하는데는 한계가 있었다.This type of fuel injection control has a limitation in coping with all operating conditions of the engine such as high, low load and rapid acceleration.

발명은 상기와 같은 문제점을 해결하기 위하여 전자에 의하여 작동되는 전자밸브(13)와 파핏밸브(10)에 의하여 부스터피스톤(8)에 유압을 가하여 고압을 얻을 수 있도록 함으로서 종래 캠에 의해 구동되는 보시식(BOSCH TYPE)보다 월등히 높은 200압력(MPa)이상의 고압분사가 가능하고 고압으로 인한 기계적소음과 캠로울러부의 마찰증대에 의한 마모를 해소시킬 수 있음과 아울러 고압화하면서도 전자적으로 연료분사를 최적화하고 기관운전조건에 다른 연료분사가 연소최적화 알고리즘의 시그널에 대해 최고의 응답특성을 갖도록하여 저연비 저공해 가스배출을 실현할 수 있도록 한 디젤기관용 전자제어식 고압연료분사기를 제공할 수 있도록 함에 있다.In order to solve the above problems, it is possible to obtain a high pressure by applying hydraulic pressure to the booster piston (8) by the solenoid valve 13 and the poppet valve (10) which are operated by electrons. High pressure injection over 200 MPa, which is much higher than BOSCH TYPE, is possible and mechanical noise caused by high pressure and abrasion caused by increased friction of cam roller part can be eliminated. It is to provide an electronically controlled high-pressure fuel injector for a diesel engine that enables fuel injection different from the engine operating conditions to have the best response to the signal of the combustion optimization algorithm to realize low fuel consumption and low pollution gas emission.

제1도는 본 발명의 전체단면도.1 is a cross-sectional view of the present invention.

제2도는 본 발명의 요부단면도.2 is a cross-sectional view of main parts of the present invention.

제3도는 본 발명의 요부단면도.3 is a cross-sectional view of main parts of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 메인보디 1A,1B : 상,하부유실1: Main body 1A, 1B: Upper and lower chamber

1C : 출구 2 : 노즐보디1C: outlet 2: nozzle body

201 : 분사구멍(INJECTION HOLE) 202 : 유실201: INJECTION HOLE 202: Loss

3 : 니들밸브(NEEDLE VALVE) 4 : 통로3: NEEDLE VALVE 4: Passage

5 : 연료통로 6 : 호울더보디5: fuel passage 6: holder body

7 : 첵밸브(CHECK VALVE) 8 : 부스터피스톤(BOOSTER PISION)7: CHECK VALVE 8: BOOSTER PISION

8′: 플런저(PLUNGER)8 ': Plunger

9 : 연료량조절스로틀(PUEL METERING THROTTLE)9: Fuel Control Throttle (PUEL METERING THROTTLE)

10 : 파핏밸브(POPPET VALVE) 10A : 입구10: Poppet Valve 10A: Inlet

10B : 출구 10C,10D : 출입구10B: Exit 10C, 10D: Doorway

101,102 : 밸브시트 11 : 변봉101,102 valve seat 11: rod

11A : 돌환 12 : 스프링11A: turnaround 12: spring

13 : 전자밸브(ELECTROMAGNETIC VALVE)13: ELECTROMAGNETIC VALVE

13A : 입구 13B : 출구13A: Entrance 13B: Exit

131,132 : 밸브시트 14 : 변봉131,132: valve seat 14: rod

14A : 돌환 15 : 유압펌프14A: turnaround 15: hydraulic pump

16 : 탱크 17 : 전자제어유니트16 tank 17 electronic control unit

노즐보디(2)에 형성한 분사구멍(201)에 니들밸브(3)를 끼우고 연료통로(5)를 형성하여서 된 것에 있어서, 노즐보디(2)와 메인보디(1)의 사이에는 첵밸브(7)를 고정한 호울더보디(6)를 고정하여 유실(202)을 형성하고, 메인보디(1)의 상,하유실(1A)(1B)에는 서로 일체로 된 부스터피스톤(8)과 플런저(8′)를 끼우는 한편, 연료통로(5)는 하부유실(1B)과 연통시키고 메인보디(1)에 형성한 통로(4)는 유실(202)과 연통시켜 통로(4)에는 연료량조절스로틀(9)을 고정하고, 메인보디(1)의 출입구(10C)에는 밸브시트(101)(102)가 형성되고 입구(10A),출구(10B),출입구(10D)를 형성한 파핏밸브(10)의 출입구(10C)을 일치시켜 고정하고, 파핏밸브(10)에 돌환(11A)을 형성한 변봉(11)을 스프링(12)에 의하여 탄발되게 끼워 고정하여 연료출입방향을 변환시킬 수 있도록 하고, 파핏밸브(10)의 일측에는 밸브시트(131)(132)와 출구(13B), 입구(13A), 출입구(13C)가 형성되고 돌환(14A)을 형성한 변봉(14)이 내입된 전자밸브(13)를 설치하여 출입구(13C)는 파핏밸브(10)의 출입구(10D)와 연결하고, 메인보디(1)의 통로(4)와 파핏밸브(10)의 입구(10A)및 전자밸브(13)의 입구(13A)는 유압펌프(15)와, 파핏밸브(10)의 출구(10B)와 전자밸브(13)의 출구(13B)는 탱크(16)와 연결하고, 전자밸브(13)는 전자제어유니트(17)와 연결하여 작동되게 한것인데, 전자제어유니트(17)는 일반 자동전화회로와 동일 개념으로 보면 된다.The needle valve 3 is inserted into the injection hole 201 formed in the nozzle body 2, and the fuel passage 5 is formed. The nozzle valve is disposed between the nozzle body 2 and the main body 1; The holder body 6 fixed with (7) is fixed to form the oil chamber 202, and the booster piston 8 and the plunger which are integral with each other in the upper and lower oil chambers 1A and 1B of the main body 1 are fixed. The fuel passage 5 communicates with the lower oil chamber 1B, while the passage 4 formed in the main body 1 communicates with the oil chamber 202 so that the fuel volume adjusting throttle (9) is fixed, the pitpit valve 10 is formed with a valve seat 101 (102) at the inlet (10C) of the main body (1) and formed inlet (10A), outlet (10B), outlet (10D) Coincidence and fix (10C) of the inlet (10C), and fixed to the poppet valve (10) to form a round rod 11A (11A) to be elastically fixed by the spring 12 to change the fuel entry direction On one side of the poppet valve 10 The solenoid valve 13 into which the seat 131, 132, the outlet 13B, the inlet 13A, and the inlet and outlet 13C are formed, and the rim 14 which formed the round-shaped 14A was installed, was installed. 13C is connected to the inlet 10D of the poppet valve 10, the passage 4 of the main body 1, the inlet 10A of the poppet valve 10 and the inlet 13A of the solenoid valve 13 are The hydraulic pump 15, the outlet 10B of the poppet valve 10 and the outlet 13B of the solenoid valve 13 are connected to the tank 16, and the solenoid valve 13 is connected to the solenoid control unit 17. The electronic control unit 17 is considered to be the same concept as a general automatic telephone circuit.

미설명부호 18은 연소실이다.Reference numeral 18 is a combustion chamber.

이와 같은 본 발명의 작동을 설명하면 다음과 같다.Referring to the operation of the present invention as follows.

전자밸브(13)에 전류가 단전된 상태에서는 전자변(13)의 변봉(14)의 돌환(14A)은 밸브시트(131)에 접촉된 상태로 되어 파핏밸브(10)의 출입구(10D)측의 유압을 전자밸브(13)의 출입구(13C)와 출구(13B)를 통하여 배출될 수 있는 상태로되고 스프링(12)의 탄발력에 의하여 변봉(11)의 돌환(11A)은 파핏밸브(10)의 밸브시트(102)에 접촉된다.In the state in which the solenoid valve 13 is disconnected, the turn 14A of the edge rod 14 of the solenoid valve 13 is in contact with the valve seat 131, and the inlet 10D side of the poppet valve 10 The hydraulic pressure is discharged through the inlet and outlet 13C and the outlet 13B of the solenoid valve 13, and by the elastic force of the spring 12, the turn 11A of the rim 11 is a poppet valve 10 In contact with the valve seat 102.

이에 따라 유압펌프(15)에 의하여 가압되는 유압은 파핏밸브(10)의 입구(10A)와 출입구(10C)및 메인보디(1)의 출입구(1C)를 통하여 상부유실(1A)로 유입되어 유압은 부스터피스톤(8)은 상부에 가해져 부스터피스톤(8)및 이와 일체로 된 플린저(8′)는 하강하게 되는 한편, 통로(4)를 통하여 유실(202)로 유입되어 니들밸브(3)의 상부에 가해짐과 동시에 첵밸브(7)와 하부유실(1B)및 연료통로(5)에도 유압은 가해진 상태로 되는데, 이때 니들밸브(3)는 유압을 받는 면적이 니들밸브(3) 하루보다 상부가 더 넓으므로 니들밸브(3)의 힘은 방향은 하부로 작용하여 분사구멍(201)은 막힌 상태로 됨으로 연로통로(5)와 접한 니들밸브(3)부에 10압력(MPa)의 유압이 가해져 있어서도 니들밸브(3)가 상승되어 분사가 행하여짐이 없이 잔류압력은 10MPa로 유지하게 된다.Accordingly, the hydraulic pressure pressurized by the hydraulic pump 15 flows into the upper oil chamber 1A through the inlet 10A and the inlet 10C of the poppet valve 10 and the inlet 1C of the main body 1 to supply the hydraulic pressure. The silver booster piston 8 is applied to the upper portion so that the booster piston 8 and the plunger 8 'integrated therein are lowered, while the booster piston 8 flows into the oil chamber 202 through the passage 4 and the needle valve 3 At the same time, the hydraulic pressure is applied to the check valve (7), the lower oil chamber (1B), and the fuel passage (5). At this time, the needle valve (3) receives the hydraulic pressure from the needle valve (3) a day. Since the upper part is wider, the force of the needle valve 3 acts downward and the injection hole 201 is blocked. Therefore, the pressure of the needle valve 3 in the needle valve 3 in contact with the passage passage 5 is increased by 10 MPa. Even when hydraulic pressure is applied, the needle valve 3 is raised to maintain the residual pressure at 10 MPa without spraying.

분사에 필요한 연료공급은 전자제어유니트(17)의 시그널에 의한 전자밸브(13)의 작동에 의하여 이루어지게 되는 것으로서, 전자밸브(13)에 전기가 공급되면 자화에 의하여 변봉(14)이 이동되어 변봉(14)의 돌환(14A)은 전자밸브(13)의 밸브시트(132)에 접촉되어 유압은 전자밸브(13)의 입구(13A)와 출입구(13C)및 파핏밸브(10)의 출입구(10D)를 통하여 변봉(11)에 가해져 변봉(11)은 이동되어 돌환(11A)은 밸브시트(101)에 접촉된다.The fuel supply required for injection is made by the operation of the solenoid valve 13 by the signal of the electronic control unit 17. When electricity is supplied to the solenoid valve 13, the edge 14 is moved by magnetization. The turn 14A of the rim 14 is in contact with the valve seat 132 of the solenoid valve 13 so that the hydraulic pressure is inlet 13A and inlet 13C of the solenoid valve 13 and the inlet and outlet of the poppet valve 10. It is applied to the edge bar 11 through 10D), and the edge bar 11 is moved so that the annular 11A contacts the valve seat 101.

이에 따라 메인보디(1)의 상부유실(1A)의 유액은 출입구(1C)(10C)와 피핏밸브(10)의 출구(10B)를 통하여 배출되는 것에 의하여 부스터피스톤(8)의 상부에 가해지고 있던 유압이 해제된다.Accordingly, the fluid of the upper oil chamber 1A of the main body 1 is applied to the upper part of the booster piston 8 by being discharged through the inlet 1C and 10C and the outlet 10B of the pitpit valve 10. The hydraulic pressure that was present is released.

부스터피스톤(8)의 상부의 유압이 감소되면 통로(4)을 통하여 유실(202)로 유입되어 다시 첵밸브(7)를 통하여 하부유실(1B)로 유입되는 유압에 의하여 플런저(8′) 및 부스터피스톤(8)은 상부로 상승하게 되며, 이때 부스터피스톤(8)의 상부로 이동되는 속도조절은 연료량조절스로틀(9)로 조절하면 된다. 분사는 전자밸브(13)에 전기를 차단하는 순간 이루어지게 된다.When the hydraulic pressure of the upper portion of the booster piston 8 is reduced, the plunger 8 'and the hydraulic oil flow into the oil chamber 202 through the passage 4 and back into the lower oil chamber 1B through the check valve 7. The booster piston 8 is raised to the upper portion, and the speed control to be moved to the upper portion of the booster piston 8 may be controlled by the fuel amount adjusting throttle 9. Injection is made at the moment of interrupting electricity to the solenoid valve (13).

즉, 부스터피스톤(8)이 적절한 거리만큼 상승하였을때 전자밸브(13)에 흐르는 전류를 차단하는 변봉(14)은 이동되어 변봉(14)의 돌환(14A)은 전자밸브(13)의 밸브시트(131)에 접촉되어 변봉(11)에 가해져있던 유압은 출입구(10D)와 전자밸브(13)의 출입구(10C)와 출구(13B)를 통하여 배출되고, 이와 동시에 변봉(11)은 스프링(12)의 탄발력으로 이동되어 변봉(11)의 돌환(11A)은 파핏밸브(10)의 밸브시트(102)에 접촉하게되어 유압은 파핏밸브(10)의 입구(10A)와 출입구(10C)및 메인보디(1)의 출입구(10C)를 통하여 상부유실(1A)로 유입되는 것에 의해 부스터피스톤(8)의 상부에 다시 유압이 가해지게 된다.That is, when the booster piston 8 rises by an appropriate distance, the rim 14 which cuts off the current flowing through the solenoid valve 13 is moved so that the turn 14A of the rim 14 is the valve seat of the solenoid valve 13. The hydraulic pressure applied to the spool 11 in contact with 131 is discharged through the inlet 10C and the outlet 10C and the outlet 13B of the solenoid valve 13, and at the same time, the spool 11 is spring 12 (11A) of the rim bar 11 is brought into contact with the valve seat 102 of the poppet valve (10) and the hydraulic pressure is inlet (10A) and inlet (10C) of the poppet valve (10) and The hydraulic pressure is again applied to the upper portion of the booster piston 8 by flowing into the upper oil chamber 1A through the entrance and exit 10C of the main body 1.

부스터피스톤(8)의 상부에 가해지는 유압에 의하여 부스터피스톤(8)과 플런저(8′)가 하향하게되면 하부유실(1B)의 압력은 상승하게됨과 동시에 이의 상승압력은 연료통로(5)를 통하여 니들밸브(3)에 가해져 니들밸브(3)의 상승으로 분사구멍(201)이 열려 고압분사되게 되는데, 이때 플런저(8′) 하부의 압력은 부스터피스톤(8)의 상부면적과 플런저(8′)하부 면적비만큼 압력이 상승하게 되므로 이 면적비를 20:1로 하면 200MPa의 압력을 얻을 수 있고, 이 압력이 니들밸브(3) 하부에 전달되어 200MPa의 고압분사가 가능하다.When the booster piston 8 and the plunger 8 'are lowered by the hydraulic pressure applied to the upper part of the booster piston 8, the pressure in the lower oil chamber 1B increases and at the same time, the rising pressure thereof causes the fuel passage 5 to rise. It is applied to the needle valve (3) through the injection hole 201 is opened by the rise of the needle valve (3) to be a high pressure injection, the pressure of the lower portion of the plunger (8 ') the booster piston (8) and the plunger (8) ′) Since the pressure rises by the lower area ratio, when the area ratio is set to 20: 1, a pressure of 200 MPa can be obtained, and this pressure is transmitted to the lower portion of the needle valve 3 to enable high-pressure injection of 200 MPa.

연료분사량은 전자밸브(13)에 전류를 통전시키는 타임(TIME)과 연료량조절스로틀(9)로 하면된다.What is necessary is just to set the fuel injection quantity as the time (TIME) which energizes a current through the solenoid valve 13, and the fuel amount adjustment throttle 9.

즉, 전자밸브(13)에 전기가 흐르기 시작하면 부스터피스톤(8) 상부의 압력해제로 플러저(8′)가 상승하기 시작하면서 연료는 제3도와 같이 첵밸브(7)를 통하여 하부유실(1B)로 들어가기 시작하며 필요로하는 양이 유입되었을 때는 전자밸브(13)의 전기가 차단되면 부스터피스톤(8) 상부에 압력이 형성되어 부스터피스톤(8) 및 플런저(8′)의 하강에 의하여 하부유실(1B)의 압력상승으로 연료는 제3도와 같이 연료통로(5)및 분사구멍(201)을 통하여 분사됨으로 따라서 전자제어유니트(17)에 의하여 전자밸브(13)의 전기통전시간을 조절함으로써 분사량을 조절할 수 있으며, 또한 연료량조절스로틀(9)에 의하여 제품제작후 플런저(8′)의 단위시간당 유출량을 설정하는데 유효하다.That is, when electricity begins to flow through the solenoid valve 13, the plunger 8 'starts to rise due to the release of pressure on the upper part of the booster piston 8, and the fuel passes through the lower valve (7) as shown in FIG. 1B), and when the required amount is introduced, when the electricity of the solenoid valve 13 is cut off, pressure is formed on the booster piston 8, thereby lowering the booster piston 8 and the plunger 8 '. As the pressure of the lower oil chamber 1B rises, fuel is injected through the fuel passage 5 and the injection hole 201 as shown in FIG. 3, thereby controlling the electric conduction time of the solenoid valve 13 by the electronic control unit 17. The injection amount can be adjusted, and it is also effective to set the flow rate per unit time of the plunger 8 'after production by the fuel amount adjustment throttle 9.

상기와 같은 작동에 의하여 기관의 운전조건에 대응하는 특정사이클의 최적분사시기와 분사량을 최적의 연소알고리즘으로 결정한 후 분사량에 해당하는 전자 밸브(13)의 전기통전시간을 계산하여 전자밸브(13)에 통전하고, 분사시기에 해당되는 시간이 정확히 전자밸브(13)의 전기통전시간을 차단함으로써 최적분사를 행할 수 있다.By determining the optimum injection time and injection amount of the specific cycle corresponding to the engine operating conditions by the above-described operation as the optimum combustion algorithm, the electric conduction time of the solenoid valve 13 corresponding to the injection amount is calculated and the solenoid valve 13 is operated. Is energized, and the optimum injection can be performed by cutting the electric energizing time of the solenoid valve 13 exactly as the time corresponding to the injection timing.

이와 같은 본 발명은 전자제어유니트(17)에 의한 전자밸브(13)의 전기통전시간을 조절함으로써 최적분사량을 조절할 수 있음과 아울러 부스터피스톤(8)에 유압을 가하는 파핏밸브(10)를 매우 합리적인 구조로 되었기 때문에 유체의 방향전환에 필요한 밸브의 이동양정을 최소로 할 수 있으므로 고응답성을 얻을 수 있고, 크기에 비해 부스터피스톤(8)의 작동유량통과률을 최대로함과 동시에 가공상고정밀을 요하지 않으며 구조가 간단하여 제조비를 절감시킬 수 있고, 또한 플런저(8′)의 연료공급구조가 유압펌프(15)에 의한 압력이 니들밸브(3)의 상부에 가해져 니들밸브(3)를 아래로 누름과 동시에 이 압력이 첵밸브(7)를 통하여 플런저(8′)하부와 니들밸브(3)에 동시에 작용하게 됨으로 니들밸브(3)를 누르는 장력을 높힐 필요가 없고, 또한 니들밸브(3)상부와 하부의 면적비에 의하여 분사개변압을 높힐 수 있으며, 잔류압력에 의하여 높은 구동압력(10MPa)이 작용하고 있는 상태이므로 플런저(8′)의 하향작동이 시작후 니들밸브(3)가 열릴때까지의 가압시간을 단축하여 분사지연시간을 최소화할 수 있는 효과가 있다.The present invention can control the optimum injection amount by adjusting the electric conduction time of the solenoid valve 13 by the electronic control unit 17, and also makes it very reasonable to use the poppet valve 10 for applying hydraulic pressure to the booster piston 8. Because of this structure, it is possible to minimize the moving head of the valve required to change the direction of the fluid, so that high response can be obtained, and the operating flow rate of the booster piston (8) is maximized compared to the size, and at the same time, high precision in processing It is not required, and the structure is simple, so that the manufacturing cost can be reduced, and the fuel supply structure of the plunger 8 'enables the pressure of the hydraulic pump 15 to be applied to the upper portion of the needle valve 3 so that the needle valve 3 is lowered. At the same time, the pressure acts on the lower part of the plunger (8 ') and the needle valve (3) through the check valve (7), so that there is no need to increase the tension for pressing the needle valve (3) and the needle valve (3). )Top The injection opening pressure can be increased by the area ratio of the lower part, and the high driving pressure (10 MPa) is acting by the residual pressure. Therefore, the downward operation of the plunger 8 'starts until the needle valve 3 is opened. Shortening the pressurization time has the effect of minimizing the injection delay time.

Claims (1)

노즐보디(2)에 형성한 분사구멍(201)에 니들밸브(3)를 끼우고 연료통로(5)를 형성하여서 된 것에 있어서, 노즐보디(2)와 메인보디(1)의 사이에 첵밸브(7)를 고정한 호울더보디(6)를 고정하여 유실(202)을 형성하고, 메인보디(1)의 상,하유실(1A)(1B)에는 서로 일체로 된 부스터피스톤(8)과 플런저(8′)를 끼우는 한편, 연료통로(5)는 하부유실(1B)과 연통시키고 메인보디(1)에 형성한 통로(4)는 유실(202)과 연통시켜 통로(4)에는 연료량조절스로틀(9)을 고정하고, 메인보디(1)의 출입구(10C)에는 밸브시트(101)(102)가 형성되고 입구(10A), 출구(10B), 출입구(10D)를 형성한 파핏밸브(10)의 출입구(10C)을 일치시켜 고정하고, 파핏밸브(10)에 돌환(11A)을 형성한 변봉(11)을 스프링(12)에 의하여 탄발되게 끼워 고정하여 연료출입방향을 변환시킬 수 있도록 하고, 파핏밸브(10)의 일측에는 밸브시트(131)(132)와 출구(13B),입구(13A),출입구(13C)가 형성되고 돌환(14A)을 형성한 변봉(14)이 내입된 전자밸브(13)를 설치하여 출입구(13C)는 파핏밸브(10)의 출입구(10D)와 연결하고, 메인보디(1)의 통로(4)와 파핏밸브(10)의 입구(10A)및 전자밸브(13)의 입구(13A)는 유압펌프(15)와, 파핏밸브(10)의 출구(10B)와 전자밸브(13)의 출구(13B)는 탱크(16)와 연결하고, 전자밸브(13)는 전자제어유니트(17)와 연결하여 작동되게 한 디젤기관용 전자제어식 고압연료분사기.The needle valve 3 is inserted into the injection hole 201 formed in the nozzle body 2, and the fuel passage 5 is formed, so that the check valve between the nozzle body 2 and the main body 1 is closed. The holder body 6 fixed with (7) is fixed to form the oil chamber 202, and the booster piston 8 and the plunger which are integral with each other in the upper and lower oil chambers 1A and 1B of the main body 1 are fixed. The fuel passage 5 communicates with the lower oil chamber 1B, while the passage 4 formed in the main body 1 communicates with the oil chamber 202 so that the fuel volume adjusting throttle (9) is fixed, the pitpit valve 10 is formed in the inlet (10C) of the main body 1, the valve seat 101 (102) and the inlet (10A), outlet (10B), the inlet (10D) Coincidence and fix (10C) of the inlet (10C), and fixed to the poppet valve (10) to form a round rod 11A (11A) to be elastically fixed by the spring 12 to change the fuel entry direction , One side of the poppet valve (10) The solenoid valve 13 having the seat 131 and 132, the outlet 13B, the inlet 13A, and the inlet 13C, and the inlet bar 14 having the inlet 14A formed therein is installed. 13C is connected to the inlet 10D of the poppet valve 10, the passage 4 of the main body 1, the inlet 10A of the poppet valve 10 and the inlet 13A of the solenoid valve 13 are The hydraulic pump 15, the outlet 10B of the poppet valve 10 and the outlet 13B of the solenoid valve 13 are connected to the tank 16, and the solenoid valve 13 is connected to the solenoid control unit 17. Electronically controlled high-pressure fuel injectors for diesel engines connected and operated.
KR1019970040525A 1997-08-25 1997-08-25 Electronic control type high pressure fuel injector for diesel engine KR100241037B1 (en)

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DE10129308C1 (en) * 2001-06-18 2002-11-28 Man B & W Diesel As Kopenhagen Fuel feed device for 2-stroke diesel engine used for e.g., for a ships drive, has at least one valve closure of fuel injection valves for each engine cylinder de-activated at partial load by associated control piston
CN110159773A (en) * 2019-06-24 2019-08-23 安徽唯嵩光电科技有限公司 A kind of high-frequency ceramic electromagnetism valve base and its solenoid valve

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