KR20040039735A - Fuel pressure controlling device of common rail diesel engine - Google Patents

Fuel pressure controlling device of common rail diesel engine Download PDF

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Publication number
KR20040039735A
KR20040039735A KR1020020067890A KR20020067890A KR20040039735A KR 20040039735 A KR20040039735 A KR 20040039735A KR 1020020067890 A KR1020020067890 A KR 1020020067890A KR 20020067890 A KR20020067890 A KR 20020067890A KR 20040039735 A KR20040039735 A KR 20040039735A
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South Korea
Prior art keywords
fuel
fuel pressure
engine
control method
common rail
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KR1020020067890A
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Korean (ko)
Inventor
신민규
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현대자동차주식회사
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Priority to KR1020020067890A priority Critical patent/KR20040039735A/en
Publication of KR20040039735A publication Critical patent/KR20040039735A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3827—Common rail control systems for diesel engines
    • 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
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/025—Means for varying pressure in common rails by bleeding fuel pressure from the common rail
    • 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
    • F02M2200/24—Fuel-injection apparatus with sensors
    • F02M2200/242—Displacement sensors

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE: A fuel pressure control device of a common rail diesel engine is provided to reduce idle vibration and improve the output of power and fuel efficiency by accurately controlling the pressure of fuel with applying inlet and outlet control methods at the same time. CONSTITUTION: A fuel pressure control device of a common rail diesel engine for supplying fuel stored in a fuel tank(350) to a common rail through a fuel pump(310) and injecting the fuel to a combustion chamber through an injector(330) is composed of an engine rpm detecting unit(360) for detecting the rpm of the common rail diesel engine; an engine control unit(370) for generating a fuel pressure control signal to control the pressure of the fuel with one of an inlet control method, an outlet control method, or an inlet/outlet control method if the input engine rpm corresponds to the set engine rpm by analyzing a signal input from the engine rpm detecting unit; and a fuel pressure regulating unit(340,342) driven to the fuel pressure control signal input from the engine control unit to return the fuel not injected by one of the inlet control method, the outlet control method, or the inlet/outlet control method to the fuel tank.

Description

커먼 레일 디젤 엔진의 연료 압력 제어장치{FUEL PRESSURE CONTROLLING DEVICE OF COMMON RAIL DIESEL ENGINE}FUEL PRESSURE CONTROLLING DEVICE OF COMMON RAIL DIESEL ENGINE}

본 발명은 커먼 레일 디젤 엔진에 관한 것으로서, 특히 커먼 레일 디젤 엔진의 연료 압력 제어장치에 관한 것이다.The present invention relates to a common rail diesel engine, and more particularly, to a fuel pressure control device of a common rail diesel engine.

통상적으로, 커먼 레일(Common Rail)을 사용하는 디젤 엔진(Diesel Engine)은 연료를 고압으로 압축하여 분사하기 때문에 압축된 연료를 효과적으로 제어하는 것이 엔진 소음을 저감하는데 큰 효과가 있다.In general, a diesel engine using a common rail (Diesel Engine) is injected by compressing the fuel at a high pressure, so effectively controlling the compressed fuel has a great effect to reduce the engine noise.

이러한 이유로, 고압의 연료를 정밀 제어하는 것이 중요한 변수로 작용한다.For this reason, precise control of high pressure fuels is an important variable.

종래의 경우 고압의 연료 압력을 제어하는 방식에는 첨부된 도 1과 도 2에 도시된 바와 같은 출구제어방식이나 입구제어방식을 채택하고 있다.Conventionally, the method of controlling the fuel pressure at high pressure employs an outlet control method or an inlet control method as shown in FIGS. 1 and 2.

도 1을 참조하면, 출구제어방식은 연료 펌프(110)에서 연료를 압축하여 커먼 레일(120)로 송출하면 인젝터(130)에서 연료를 분사하고 분사되지 않은 연료는 연료 압력 조절기(140)의 제어를 통하여 연료 탱크(150)로 리턴되어 다시 연료 공급 진행 경로를 통해 공급된다.Referring to FIG. 1, in the outlet control method, when the fuel is compressed in the fuel pump 110 and sent to the common rail 120, the injector 130 injects fuel and the uninjected fuel is controlled by the fuel pressure regulator 140. The fuel tank 150 is returned to the fuel tank 150 through the fuel supply progress path again.

출구제어방식의 경우 고압으로 압축된 연료를 연료 탱크(150)로 리턴시키기 때문에 분사압력이 높은 고속 운전 구간에서 온도가 상승된 연료가 연료 탱크(150)로 리턴된다.In the case of the outlet control method, since the fuel compressed at high pressure is returned to the fuel tank 150, the fuel whose temperature is increased in the high speed operation section in which the injection pressure is high is returned to the fuel tank 150.

만약, 연료 탱크(150)에 잔류되는 연료의 량이 적은 경우 온도가 높아진 리턴 연료에 의해 연료의 온도가 상승된 채로 다음 분사 사이클에 연료가 공급된다.If the amount of fuel remaining in the fuel tank 150 is small, fuel is supplied to the next injection cycle while the temperature of the fuel is raised by the return fuel having a higher temperature.

연료 온도가 상승되는 경우 연료 분사시 연료 효율 저하로 연비악화 및 출력 저하현상이 발생된다.When the fuel temperature rises, fuel efficiency decreases and output decreases due to a decrease in fuel efficiency during fuel injection.

따라서, 이와 같은 연료압 출구제어방식의 경우 연료 공급 라인에 별도의 부품(160)을 추가하여 연료 온도를 낮추기 때문에 원가상승 요인이 된다.Therefore, in the case of the fuel pressure outlet control method, the fuel temperature increases by adding an additional component 160 to the fuel supply line to lower the fuel temperature.

도 2를 참조하면, 입구제어방식은 연료 펌프(210)에서 커먼 레일(220)로 연료를 송출할 때 인젝터(230)에서 분사할 양을 제외하고 분사되지 않을 연료는 연료 압력 조절기(240)의 제어에 의해 바로 연료 탱크(250)로 되돌아간다.Referring to FIG. 2, the inlet control method, except for the amount of fuel to be injected from the injector 230 when the fuel is sent from the fuel pump 210 to the common rail 220, the fuel of the fuel pressure regulator 240. The control immediately returns to the fuel tank 250.

입구제어방식은 출구제어방식과 비교하여 연료 탱크(250)로 리턴되는 연료가 고온/고압으로 압축되지 않기 때문에 연료 온도의 상승폭이 상대적으로 적다.The inlet control method has a relatively small increase in fuel temperature because the fuel returned to the fuel tank 250 is not compressed to high temperature / high pressure in comparison with the outlet control method.

입구제어방식은 출구제어방식의 단점을 보완하였지만 커먼 레일(220)에 공급되는 연료량보다 연료 압력 조절기(240)에서 연료 탱크(250)로 리턴되는 양이 많아 연료 펌프(210)에서 커먼 레일(220)에 연료를 공급할 때 연료압 변동이 크게 발생한다.The inlet control method compensates for the shortcomings of the outlet control method, but the amount returned from the fuel pressure regulator 240 to the fuel tank 250 is larger than the amount of fuel supplied to the common rail 220, so that the common rail 220 from the fuel pump 210 is increased. ), Fuel pressure fluctuations occur largely.

이와 같은 초기 시동 응답성 및 감속후 급가속시 응답성이 떨어져 약간의 가속 딜레이가 발생하는 것이 입구제어방식의 문제점이다.The problem of the inlet control method is that the initial start responsiveness and the slow response after deceleration cause a slight acceleration delay.

본 발명의 목적은 커먼 레일 디젤 엔진의 연료 압력 조절방식을 입구제어방식 또는 출구제어방식 가운데 선택적으로 제어하여 연료 공급 라인의 연료 공급 상태를 보다 정밀하게 제어할 수 있는 커먼 레일 디젤 엔진의 연료 압력 제어장치를 제공하는데 있다.An object of the present invention is to control the fuel pressure regulation of the common rail diesel engine inlet or outlet control method to control the fuel pressure of the common rail diesel engine that can more precisely control the fuel supply state of the fuel supply line To provide a device.

도 1은 종래 기술에 따른 커먼 레일 디젤 엔진의 연료 압력을 출구에서 제어하는 방식을 도시한 구성도.1 is a block diagram showing a method of controlling the fuel pressure of the common rail diesel engine according to the prior art at the outlet.

도 2는 종래 기술에 따른 커먼 레일 디젤 엔진의 연료 압력을 입구에서 제어하는 방식을 도시한 구성도.Figure 2 is a block diagram showing a method of controlling the fuel pressure of the common rail diesel engine according to the prior art inlet.

도 3은 본 발명의 실시예에 따른 커먼 레일 디젤 엔진의 연료 압력 제어장치 구성을 도시한 도면.3 is a view showing the configuration of a fuel pressure control device of a common rail diesel engine according to an embodiment of the present invention.

상기와 같은 목적을 달성하기 위하여 본 발명은 연료 탱크에 저장된 연료를 연료 펌프를 통해 커먼 레일로 공급하여 인젝터를 통해 연소실로 분사하는 커먼 레일 디젤 엔진의 연료 압력 제어장치에 있어서, 상기 커먼 레일 디젤 엔진의 회전수를 검출하는 엔진 회전수 검출부와; 상기 엔진 회전수 검출부로부터 입력되는 신호를 분석하여 입력된 엔진 회전수가 설정된 엔진 회전수에 해당되면, 입구제어방식, 출구제어방식, 또는 입구제어방식과 출구제어방식을 혼용하는 방식 가운데 해당되는 연료 압력 제어방식으로 제어하도록 해당되는 연료 압력 제어신호를 발생하는 엔진 제어부와; 상기 엔진 제어부로부터 공급되는 연료 압력 제어신호의 입력에 따라 구동되어 입구제어방식, 출구제어방식, 또는 입구제어방식과 출구제어방식을 혼용하는 방식 가운데 해당되는 연료 압력 제어방식으로 분사되지 않은 연료를 연료 탱크로 리턴시키는 연료 압력 조절부를 포함하여 구성하는 것을 특징으로 한다.In order to achieve the above object, the present invention provides a fuel pressure control device of a common rail diesel engine for supplying fuel stored in a fuel tank to a common rail through a fuel pump and injecting the combustion chamber through an injector, wherein the common rail diesel engine An engine speed detector for detecting a rotation speed of the engine; When the engine speed input by analyzing the signal input from the engine speed detection unit corresponds to the set engine speed, the fuel pressure corresponding to the inlet control method, the outlet control method, or a mixture of the inlet control method and the outlet control method An engine control unit for generating a fuel pressure control signal corresponding to the control method; Fuel that is driven according to the input of the fuel pressure control signal supplied from the engine control unit and is not injected with the fuel pressure control method among the inlet control method, the outlet control method, or a method of mixing the inlet control method and the outlet control method with the fuel; It is characterized by including a fuel pressure adjusting unit to return to the tank.

이하 본 발명의 바람직한 실시예를 첨부한 도면을 참조하여 상세히 설명한다. 하기 설명 및 첨부 도면과 같은 많은 특정 상세들이 본 발명의 보다 전반적인 이해를 제공하기 위해 나타나 있으나, 이들 특정 상세들은 본 발명의 설명을 위해 예시한 것으로 본 발명이 그들에 한정됨을 의미하는 것은 아니다. 그리고 본 발명의 요지를 불필요하게 흐릴 수 있는 공지 기능 및 구성에 대한 상세한 설명은 생략한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

도 3을 참조하여 본 발명의 실시예에 따른 커먼 레일 디젤 엔진의 연료 압력 제어장치 구성을 설명한다.A configuration of a fuel pressure control device of a common rail diesel engine according to an exemplary embodiment of the present invention will be described with reference to FIG. 3.

본 발명의 실시예는 연료 탱크(350)에 저장된 연료를 연료 펌프(310)를 통해 커먼 레일(320)로 공급하여 인젝터(330)를 통해 연소실로 분사하는 커먼 레일 디젤 엔진의 연료 압력 제어장치에 있어서, 엔진 회전수 검출부(360), 엔진 제어부(370), 연료 압력 조절부(340, 342)를 포함하여 구성한다.Embodiment of the present invention to the fuel pressure control device of the common rail diesel engine for supplying the fuel stored in the fuel tank 350 to the common rail 320 through the fuel pump 310 to inject to the combustion chamber through the injector 330 In this case, the engine rotation speed detection unit 360, the engine control unit 370, and the fuel pressure adjusting units 340 and 342 are configured to be included.

엔진 회전수 검출부(360)는 커먼 레일 디젤 엔진의 회전수를 검출한다.The engine speed detection unit 360 detects the rotation speed of the common rail diesel engine.

엔진 제어부(370)는 엔진 회전수 검출부(360)로부터 입력되는 신호를 분석하여 설정된 엔진 회전수에 따른 연료 압력 제어신호를 발생한다.The engine controller 370 analyzes a signal input from the engine speed detector 360 to generate a fuel pressure control signal according to the set engine speed.

예를 들면, 엔진 제어부(370)는 엔진 회전수 검출부(360)로부터 입력되는 신호를 분석하여 입력된 엔진 회전수가 설정된 엔진 회전수에 해당되면, 입구제어방식, 출구제어방식, 또는 입구제어방식과 출구제어방식을 혼용하는 방식 가운데 해당되는 연료 압력 제어방식으로 제어하도록 해당되는 연료 압력 제어신호를 발생한다.For example, the engine controller 370 analyzes a signal input from the engine speed detector 360, and when the input engine speed corresponds to a set engine speed, the engine control method, the outlet control method, or the inlet control method is used. The fuel pressure control signal is generated so as to control the fuel pressure control method among the methods in which the outlet control method is mixed.

연료 압력 조절부(340, 342)는 엔진 제어부(370)로부터 공급되는 연료 압력 제어신호의 입력에 따라 구동되어 분사되지 않은 연료를 연료 탱크(350)로 리턴시킨다.The fuel pressure adjusting units 340 and 342 are driven in response to the input of the fuel pressure control signal supplied from the engine control unit 370 to return the uninjected fuel to the fuel tank 350.

즉, 연료 압력 조절부(340, 342)는 엔진 제어부(370)로부터 공급되는 연료 압력 제어신호의 입력에 따라 구동되어 입구제어방식, 출구제어방식, 또는 입구제어방식과 출구제어방식을 혼용하는 방식 가운데 해당되는 연료 압력 제어방식으로 분사되지 않은 연료를 연료 탱크(350)로 리턴시키는 동작을 수행한다.That is, the fuel pressure regulators 340 and 342 are driven according to the input of the fuel pressure control signal supplied from the engine controller 370 to mix the inlet control method, the outlet control method, or the inlet control method and the outlet control method. The fuel is not injected in the corresponding fuel pressure control method is returned to the fuel tank 350 in the middle.

연료 압력 조절부(340, 342)는 제1 연료 압력 조절기(340), 제2 연료 압력 조절기(342)를 포함하여 구성한다.The fuel pressure regulators 340 and 342 include a first fuel pressure regulator 340 and a second fuel pressure regulator 342.

제1 연료 압력 조절기(340)는 도 3에 도시된 바와 같이 연료 펌프(310)의 일측에 장착되며, 엔진 제어부(370)로부터 공급되는 연료 압력 제어신호의 입력에 따라 구동되어 연료 펌프(310)에서 커먼 레일(320)로 연료를 송출할 때 인젝터(330)에서 분사할 양을 제외하고 분사되지 않을 연료를 연료 탱크(350)로 리턴시킨다.As shown in FIG. 3, the first fuel pressure regulator 340 is mounted on one side of the fuel pump 310 and is driven in response to the input of the fuel pressure control signal supplied from the engine controller 370. When the fuel is sent to the common rail 320 in the fuel injector except for the amount to be injected from the injector 330 is returned to the fuel tank 350.

제2 연료 압력 조절기(342)는 도 3에 도시된 바와 같이 커먼 레일(320)의 일측에 장착되며, 엔진 제어부(370)로부터 공급되는 연료 압력 제어신호의 입력에 따라 구동되어 커먼 레일(320)을 통해 인젝터(330)에서 연료를 분사할 때 분사되지 않은 연료를 연료 탱크(350)로 리턴시킨다.The second fuel pressure regulator 342 is mounted on one side of the common rail 320 as shown in FIG. 3, and driven in response to the input of the fuel pressure control signal supplied from the engine control unit 370, the common rail 320. When the fuel is injected from the injector 330, the uninjected fuel is returned to the fuel tank 350.

상기와 같은 구성에서 엔진 제어부(370)는 엔진 회전수 검출부(360)로부터 입력되는 신호가 저속 운전 상태에 해당되는 신호이면, 제1 연료 압력 조절기(340)로 공급되는 연료 압력 제어신호를 차단하고, 제2 연료 압력 조절기(342)만을 제어하는 출구제어방식 제어동작을 수행한다.In the configuration described above, the engine controller 370 blocks the fuel pressure control signal supplied to the first fuel pressure regulator 340 when the signal input from the engine speed detector 360 corresponds to a low speed driving state. The outlet control method of controlling only the second fuel pressure regulator 342 is performed.

즉, 저속 운전 구간에서는 아이들 진동을 저감하기 위하여 제1 연료 압력 조절기(340)로 제어하지 않고 고압의 연료를 모두 커먼 레일(320)로 보내고 사용하지 않는 연료를 제2 연료 압력 조절기(342)의 제어를 통하여 연료 탱크(350)로 리턴시킨다.That is, in the low speed driving section, all the high-pressure fuel is sent to the common rail 320 without being controlled by the first fuel pressure regulator 340 to reduce idle vibration, and the unused fuel is transferred to the second fuel pressure regulator 342. Return to the fuel tank 350 through the control.

또한, 엔진 제어부(370)는 엔진 회전수 검출부(360)로부터 입력되는 신호가 고속 운전 상태에 해당되는 신호이면, 제2 연료 압력 조절기(342)로 공급되는 연료 압력 제어신호를 차단하고, 제1 연료 압력 조절기(340)만을 제어하는 입구제어방식 제어동작을 수행한다.In addition, when the signal input from the engine speed detection unit 360 is a signal corresponding to a high speed driving state, the engine controller 370 blocks the fuel pressure control signal supplied to the second fuel pressure regulator 342, The inlet control method of controlling only the fuel pressure regulator 340 is performed.

또한, 엔진 제어부(370)는 엔진 회전수 검출부(360)로부터 입력되는 신호가 공회전 상태에 해당되는 신호이면, 제1 연료 압력 조절기(340)와 제2 연료 압력 조절기(342)로 각각 연료 압력 제어신호를 공급하여 입구제어방식과 출구제어방식을 혼용하는 방식으로 연료 압력 제어동작을 수행하여 연료 온도 상승이나 연료압 변동이 발생되지 않게 한다.In addition, when the signal input from the engine speed detector 360 is a signal corresponding to an idle state, the engine controller 370 controls the fuel pressure with the first fuel pressure regulator 340 and the second fuel pressure regulator 342, respectively. By supplying a signal, the fuel pressure control operation is performed in a manner of mixing the inlet control method and the outlet control method so that fuel temperature rise or fuel pressure fluctuation does not occur.

공회전시는 분사량보다 리턴량이 많아 연료온도가 상승하지만 실제로 전 운전영역을 보면 고속 운전 조건에서 제2 연료 압력 조절기(342)의 작동을 정지시키고 제1 연료 압력 조절기를 이용한 입구제어를 하기 때문에 저온의 연료가 연료 탱크(350)로 리턴되고 연료 탱크(350)에 잔류된 연료의 온도는 상승되지 않는다.When idling, the fuel temperature rises because the return amount is larger than the injection amount. However, when the fuel cell temperature is increased, the operation of the second fuel pressure regulator 342 is stopped and the inlet control using the first fuel pressure regulator is performed under high speed operating conditions. The fuel is returned to the fuel tank 350 and the temperature of the fuel remaining in the fuel tank 350 is not raised.

상술한 바와 같이 본 발명에 따른 커먼 레일 디젤 엔진의 연료 압력 제어장치는 입구제어/출구제어를 동시에 적용하여 정밀한 연료압을 제어할 수 있어 공회전 진동저감 및 출력향상과 연비향상을 이룰 수 있는 효과가 있다.As described above, the fuel pressure control apparatus of the common rail diesel engine according to the present invention can control the precise fuel pressure by simultaneously applying the inlet control / outlet control, thereby reducing idling vibration and improving output and fuel efficiency. have.

Claims (5)

연료 탱크에 저장된 연료를 연료 펌프를 통해 커먼 레일로 공급하여 인젝터를 통해 연소실로 분사하는 커먼 레일 디젤 엔진의 연료 압력 제어장치에 있어서,In the fuel pressure control device of the common rail diesel engine for supplying the fuel stored in the fuel tank to the common rail through the fuel pump and injecting the combustion chamber through the injector, 상기 커먼 레일 디젤 엔진의 회전수를 검출하는 엔진 회전수 검출부와;An engine speed detector for detecting a speed of the common rail diesel engine; 상기 엔진 회전수 검출부로부터 입력되는 신호를 분석하여 입력된 엔진 회전수가 설정된 엔진 회전수에 해당되면, 입구제어방식, 출구제어방식, 또는 입구제어방식과 출구제어방식을 혼용하는 방식 가운데 해당되는 연료 압력 제어방식으로 제어하도록 해당되는 연료 압력 제어신호를 발생하는 엔진 제어부와;When the engine speed input by analyzing the signal input from the engine speed detection unit corresponds to the set engine speed, the fuel pressure corresponding to the inlet control method, the outlet control method, or a mixture of the inlet control method and the outlet control method An engine control unit for generating a fuel pressure control signal corresponding to the control method; 상기 엔진 제어부로부터 공급되는 연료 압력 제어신호의 입력에 따라 구동되어 입구제어방식, 출구제어방식, 또는 입구제어방식과 출구제어방식을 혼용하는 방식 가운데 해당되는 연료 압력 제어방식으로 분사되지 않은 연료를 연료 탱크로 리턴시키는 연료 압력 조절부를 포함하여 구성하는 것을 특징으로 하는 커먼 레일 디젤 엔진의 연료 압력 제어장치.Fuel that is driven according to the input of the fuel pressure control signal supplied from the engine control unit and is not injected with the fuel pressure control method among the inlet control method, the outlet control method, or a method of mixing the inlet control method and the outlet control method with the fuel; A fuel pressure control device of a common rail diesel engine, comprising a fuel pressure adjusting unit for returning to a tank. 제1항에 있어서, 상기 연료 압력 조절부는According to claim 1, wherein the fuel pressure control unit 상기 연료 펌프의 일측에 장착되며, 상기 엔진 제어부로부터 공급되는 연료 압력 제어신호의 입력에 따라 구동되어 연료 펌프에서 커먼 레일로 연료를 송출할 때 인젝터에서 분사할 양을 제외하고 분사되지 않을 연료를 연료 탱크로 리턴시키는 제1 연료 압력 조절기와;It is mounted on one side of the fuel pump and driven according to the input of the fuel pressure control signal supplied from the engine control unit to fuel fuel that will not be injected except for the amount to be injected from the injector when the fuel is pumped from the fuel pump to the common rail. A first fuel pressure regulator for returning to the tank; 상기 커먼 레일의 일측에 장착되며, 상기 엔진 제어부로부터 공급되는 연료 압력 제어신호의 입력에 따라 구동되어 커먼 레일을 통해 인젝터에서 연료를 분사할 때 분사되지 않은 연료를 연료 탱크로 리턴시키는 제2 연료 압력 조절기를 포함하여 구성하는 것을 특징으로 하는 커먼 레일 디젤 엔진의 연료 압력 제어장치.A second fuel pressure mounted on one side of the common rail and driven according to an input of a fuel pressure control signal supplied from the engine controller to return uninjected fuel to the fuel tank when injecting fuel from the injector through the common rail; Fuel pressure control device of a common rail diesel engine comprising a regulator. 제2항에 있어서, 상기 엔진 제어부는The method of claim 2, wherein the engine control unit 상기 엔진 회전수 검출부로부터 입력되는 신호가 저속 운전 상태에 해당되는 신호이면, 상기 제1 연료 압력 조절기로 공급되는 연료 압력 제어신호를 차단하고, 상기 제2 연료 압력 조절기만을 제어하는 출구제어방식 제어동작을 수행하는 것을 특징으로 하는 커먼 레일 디젤 엔진의 연료 압력 제어장치.If the signal input from the engine speed detection unit is a signal corresponding to a low speed operation state, the control method of the outlet control method to block the fuel pressure control signal supplied to the first fuel pressure regulator, and to control only the second fuel pressure regulator. Fuel pressure control device of a common rail diesel engine, characterized in that to carry out. 제2항에 있어서, 상기 엔진 제어부는The method of claim 2, wherein the engine control unit 상기 엔진 회전수 검출부로부터 입력되는 신호가 고속 운전 상태에 해당되는 신호이면, 제2 연료 압력 조절기로 공급되는 연료 압력 제어신호를 차단하고, 상기 제1 연료 압력 조절기만을 제어하는 입구제어방식 제어동작을 수행하는 것을 특징으로 하는 커먼 레일 디젤 엔진의 연료 압력 제어장치.If the signal input from the engine speed detection unit is a signal corresponding to a high speed driving state, the fuel pressure control signal supplied to the second fuel pressure regulator is blocked, and the inlet control method control operation for controlling only the first fuel pressure regulator is performed. A fuel pressure control device of a common rail diesel engine, characterized in that performed. 제2항에 있어서, 상기 엔진 제어부는The method of claim 2, wherein the engine control unit 상기 엔진 회전수 검출부로부터 입력되는 신호가 공회전 상태에 해당되는 신호이면, 제1 연료 압력 조절기와 제2 연료 압력 조절기로 각각 연료 압력 제어신호를 공급하여 입구제어방식과 출구제어방식을 혼용하는 방식으로 연료 압력 제어동작을 수행하는 것을 특징으로 하는 커먼 레일 디젤 엔진의 연료 압력 제어장치.If the signal input from the engine speed detector is a signal corresponding to the idle state, the fuel pressure control signal is supplied to the first fuel pressure regulator and the second fuel pressure regulator, respectively, so that the inlet control method and the outlet control method are mixed. A fuel pressure control device of a common rail diesel engine, characterized in that for performing a fuel pressure control operation.
KR1020020067890A 2002-11-04 2002-11-04 Fuel pressure controlling device of common rail diesel engine KR20040039735A (en)

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JPH09264228A (en) * 1996-03-29 1997-10-07 Unisia Jecs Corp Deicing device for fuel injection valve
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JP2000291474A (en) * 1999-04-01 2000-10-17 Mitsubishi Electric Corp Method and device for controlling fuel pressure adjusting valve

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06288314A (en) * 1993-04-08 1994-10-11 Toyota Motor Corp Fuel feed device for internal combustion engine
JPH09228879A (en) * 1996-02-24 1997-09-02 Robert Bosch Gmbh Internal combustion engine control method and its device
JPH09264228A (en) * 1996-03-29 1997-10-07 Unisia Jecs Corp Deicing device for fuel injection valve
KR19980052236U (en) * 1996-12-31 1998-10-07 박병재 Temperature reduction structure of fuel supplied to engine
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