KR20050032740A - Fuel injection timing compensating apparatus and method - Google Patents

Fuel injection timing compensating apparatus and method Download PDF

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Publication number
KR20050032740A
KR20050032740A KR1020030068683A KR20030068683A KR20050032740A KR 20050032740 A KR20050032740 A KR 20050032740A KR 1020030068683 A KR1020030068683 A KR 1020030068683A KR 20030068683 A KR20030068683 A KR 20030068683A KR 20050032740 A KR20050032740 A KR 20050032740A
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South Korea
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fuel injection
injection timing
cylinder
engine
injection time
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KR1020030068683A
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Korean (ko)
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진재민
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현대자동차주식회사
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Priority to KR1020030068683A priority Critical patent/KR20050032740A/en
Publication of KR20050032740A publication Critical patent/KR20050032740A/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
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/401—Controlling injection timing
    • 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
    • F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

A compensation device of fuel injection time and a method thereof are provided to decrease deviation of fuel injection time, and to reduce irregular vibration of an engine by advancing or delaying the basic fuel injection time of each cylinder according to compensation value. A fuel injection time compensation device is composed of a vibration sensor(10) installed in a cylinder block of an engine(20) to detect LPP(Location Of Peak Pressure) of each cylinder, an engine control unit(30) calculating a fuel injection time compensation value by comparing LPP of each cylinder with reference LPP and deciding final fuel injection time by advancing or retarding basic fuel injection time of the cylinder based on the fuel injection time compensation value, and injectors(52,54,56,58) injecting fuel to each cylinder according to final fuel injection time decided by the engine control unit.

Description

연료분사시기 보정장치 및 방법 {Fuel injection timing compensating apparatus and method} Fuel injection timing compensating apparatus and method

본 발명은 연료분사시기 보정장치 및 방법에 관한 것으로, 좀더 상세하게는 디젤엔진에서 각 실린더내로 분사되는 연료의 분사시기 편차를 보정하여 엔진의 불규칙한 진동, 성능 저하, 승차감을 개선하는 연료분사시기 보정장치 및 방법에 관한 것이다.The present invention relates to a fuel injection timing correction device and method, and more particularly, to correct the injection timing deviation of the fuel injected into each cylinder in the diesel engine to improve the fuel injection timing to improve the irregular vibration, performance degradation, ride comfort of the engine An apparatus and method are provided.

현재 승용형 디젤엔진에는 대부분 전자제어방식의 커먼레일 타입 분사장치가 채용되고 있다. 이러한 분사장치는 전자식으로 분사계를 제어하여 보다 정확하고 높은 압력의 연료 분사를 가능하게 한다.At present, most common diesel engines are electronically controlled common rail type injectors. This injector electronically controls the injector to enable more accurate and higher pressure fuel injection.

그러나, 상기와 같은 커먼레일 타입 분사장치는 모든 실린더에 같은 분사시기에 분사를 함으로 인해 각 실린더 별로 발생할 수 있는 차이를 보정하지 못하는 단점을 가지고 있다.However, the common rail type injector as described above has a disadvantage in that it is impossible to correct a difference that may occur for each cylinder by injecting all cylinders at the same injection timing.

즉, 디젤 직렬식 4기통 엔진에서 연료 분사시기는 각 기통간의 차이를 무시하고 크랭크 각도를 기준으로 분사가 이루어지는데, 이 연료 분사시기는 엔진 알피엠과 연료량에 의하여 맵핑되어 결정된다.That is, in the diesel in-line four-cylinder engine, the fuel injection timing is performed based on the crank angle, ignoring the difference between the cylinders, and the fuel injection timing is mapped and determined by the engine alpha and the fuel amount.

이러한 경우 실린더별 공기량 및 인젝터간의 편차로 발생될 수 있는 차이로 인하여 연소압의 차이가 발생될 수 있고, 이로 인해 불규칙적인 진동이 발생하게 되어 승차감에 좋지 않을 뿐만 아니라 각 실린더별로 발생하는 유효평균압력에도 다소 차이가 발생하게 된다.In this case, there may be a difference in combustion pressure due to the difference between the amount of air and the injector of each cylinder, which may cause irregular vibrations, which is not good for riding comfort and effective average pressure generated for each cylinder. Some differences will occur.

다시 말하면, 실린더 간에 이론적으로는 같은 간격으로 연료를 분사하였으나, 인젝터간의 편차 그리고 실린더간의 편차로 인하여 최고연소압력위치(LPP, Location of Peak Pressure)가 같은 간격을 이루지 못하고 실린더 간의 편차에 의하여 차이가 발생하게 된다.In other words, the fuel is injected at theoretically equal intervals between the cylinders, but due to the deviation between the injectors and the deviation between the cylinders, the location of peak pressure (LPP) does not form the same interval and the difference is caused by the deviation between the cylinders. Will occur.

이에, 본 발명은 상기한 바와 같은 종래의 제 문제점을 해소하기 위해 발명된 것으로, 엔진의 블록에 진동센서를 장착하여 각 실린더별로 최고연소압력위치를 검출한 후 기준 실린더를 정하고 이와 차이가 발생하는 실린더의 분사시기를 조정함으로써, 연료분사시기의 편차를 줄일 수 있어 엔진에서 발생하는 불규칙한 진동을 감소시킬 수 있는 연료분사시기 보정장치 및 방법을 제공하는데 그 목적이 있다.Thus, the present invention was invented to solve the above-mentioned problems of the prior art, the vibration sensor is mounted on the block of the engine to detect the highest combustion pressure position for each cylinder, and then the reference cylinder is determined and the difference occurs. It is an object of the present invention to provide a fuel injection timing correcting apparatus and method capable of reducing the variation in fuel injection timing by adjusting the injection timing of a cylinder, thereby reducing irregular vibration generated in the engine.

상기한 바와 같은 목적을 달성하기 위한 본 발명에 따른 연료분사시기 보정장치는, 엔진의 실린더 블록에 설치되어 각 실린더의 최고연소압력위치를 검출하는 진동센서와; 기준 실린더의 최고연소압력위치와 다른 실린더들의 최고연소압력위치를 비교하여 연료분사시기 보정치를 구하고, 이 연료분사시기 보정치를 바탕으로 상기 다른 실린더들의 기본 연료분사시기를 진각 또는 지각시켜서 최종 연료분사시기를 결정하는 엔진제어유니트와; 상기 엔진제어유니트에 의해 결정된 최종 연료분사시기에 따라 연료를 각 실린더내로 분사하는 인젝터들을 포함하여 구성된 것을 특징으로 한다.Fuel injection timing correction device according to the present invention for achieving the above object is provided with a vibration sensor for detecting the highest combustion pressure position of each cylinder is installed in the cylinder block of the engine; The fuel injection timing correction value is obtained by comparing the highest combustion pressure position of the reference cylinder with the highest combustion pressure position of the other cylinders, and the final fuel injection timing is made by advancing or retarding the basic fuel injection timing of the other cylinders based on the fuel injection timing correction value. An engine control unit for determining; And injectors for injecting fuel into each cylinder according to the final fuel injection timing determined by the engine control unit.

상기한 바와 같은 목적을 달성하기 위한 본 발명에 따른 연료분사시기 보정방법은, 기본 연료분사시기 맵에 따라 엔진으로 연료분사를 수행하는 단계와; 엔진의 각 실린더의 최고연소압력위치를 검출하는 단계와; 기준 실린더의 최고연소압력위치에서 다른 실린더들의 최고연소압력위치를 빼서 연료분사시기 보정치를 구하는 단계와; 상기 연료분사시기 보정치를 기본 연료분사시기 맵에 따라 결정된 다른 실린더들의 기본 연료분사시기에 더하여 최종 연료분사시기를 결정하고 이 최종 연료분사시기에 따라 연료를 각 실린더내로 분사하는 단계를 포함하여 구성된 것을 특징으로 한다. A fuel injection timing correction method according to the present invention for achieving the above object comprises the steps of: performing a fuel injection to the engine according to the basic fuel injection timing map; Detecting a maximum combustion pressure position of each cylinder of the engine; Obtaining a fuel injection timing correction value by subtracting the highest combustion pressure position of the other cylinders from the highest combustion pressure position of the reference cylinder; Determining the final fuel injection timing in addition to the basic fuel injection timing of the other cylinders determined according to the basic fuel injection timing map, and injecting fuel into each cylinder according to the final fuel injection timing. It features.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 설명한다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명에 따른 연료분사시기 보정장치의 블록 구성도이다. 상기 도 1에 도시된 바와 같이 본 발명에 따른 연료분사시기 보정장치에서, 진동센서(10)는 엔진(20)의 실린더 블록에 설치되어 각 실린더의 최고연소압력위치(LPP, Location of Peak Pressure)를 검출하여 엔진제어유니트(30)로 입력하도록 되어 있다. 즉, 도 3에 도시된 바와 같이, 크랭크각도 180도 간격으로 최고진동발생위치를 검출하면 각 실린더의 최고연소압력위치(LPP)를 얻어낼 수 있는 것이다. 이때, 상기 각 실린더의 최고연소압력위치(LLP)는 실린더의 연소상사점(FTDC: Firing Top Dead Center)을 기준으로 이후이면 +, 이전이면 - 크랭크 각으로 표시한다.1 is a block diagram of a fuel injection timing correction apparatus according to the present invention. In the fuel injection timing correction apparatus according to the present invention as shown in Figure 1, the vibration sensor 10 is installed in the cylinder block of the engine 20 is the highest combustion pressure position (LPP, Location of Peak Pressure) of each cylinder Is detected and input to the engine control unit 30. That is, as shown in Figure 3, by detecting the highest vibration generating position at intervals of crank angle 180 degrees it is possible to obtain the highest combustion pressure position (LPP) of each cylinder. At this time, the maximum combustion pressure position (LLP) of each cylinder is expressed as a crank angle after +, if before, based on the firing top dead center (FTDC) of the cylinder.

상기 엔진제어유니트(30)는 초기에는 기본 연료분사시기 맵(40)에 따라 연료를 분사하도록 인젝터들(52, 54, 56, 58)을 제어하고, 이와 같이 엔진이 구동됨에 따라 상기와 같이 검출된 기준 실린더(바람직하게는 1번 실린더)의 최고연소압력위치와 다른 실린더들(2, 3, 4번 실린더)의 최고연소압력위치를 비교하여 연료분사시기 보정치를 구하고, 이 연료분사시기 보정치를 바탕으로 상기 다른 실린더들(2, 3, 4번 실린더)의 기본 연료분사시기를 진각 또는 지각시켜서 최종 연료분사시기를 결정하여 연료를 분사하도록 인젝터들(52, 54, 56, 58)을 제어하도록 되어 있다.The engine control unit 30 initially controls the injectors 52, 54, 56, 58 to inject fuel according to the basic fuel injection timing map 40, and detects as described above as the engine is driven. The fuel injection timing correction value by comparing the highest combustion pressure position of the reference cylinder (preferably cylinder 1) with the highest combustion pressure position of the other cylinders (cylinders 2, 3 and 4), and calculating the fuel injection timing correction value. To control the injectors 52, 54, 56, 58 to inject fuel by determining the final fuel injection timing by advancing or retarding the basic fuel injection timing of the other cylinders (cylinders 2, 3, 4). It is.

그리고, 인젝터들(52, 54, 56, 58)은 상기 엔진제어유니트(30)에 의해 결정된 최종 연료분사시기에 따라 연료를 각 실린더내로 분사하도록 되어 있다.The injectors 52, 54, 56, 58 are configured to inject fuel into each cylinder according to the final fuel injection timing determined by the engine control unit 30.

상기와 같이 구성된 본 발명에 따른 연료분사시기 보정장치 및 방법의 작용 및 효과를 도 2를 참조하여 상세히 설명하면 다음과 같다.The operation and effects of the fuel injection timing correcting apparatus and method according to the present invention configured as described above will be described in detail with reference to FIG. 2.

도 2는 본 발명에 따른 연료분사시기 보정방법의 순서도이다. 상기 도 2에 도시된 바와 같이, 단계(S1)에서는 엔진제어유니트(30)가 기본 연료분사시기 맵(40)에 따라 연료분사시기를 조절하여 엔진으로 연료를 분사한다.2 is a flow chart of a fuel injection timing correction method according to the present invention. As shown in FIG. 2, in step S1, the engine control unit 30 injects fuel into the engine by adjusting the fuel injection timing according to the basic fuel injection timing map 40.

이어서, 단계(S2, S3, S4, S5)에서는 진동센서(10)에 의해 1번 실린더, 3번 실린더, 4번 실린더, 2번 실린더의 최고연소압력위치가 각각 순차 검출되어 엔진제어유니트(30)로 입력된다.Subsequently, in steps S2, S3, S4, and S5, the highest combustion pressure positions of the first cylinder, the third cylinder, the fourth cylinder, and the second cylinder are sequentially detected by the vibration sensor 10, and the engine control unit 30 ) Is entered.

그리고, 단계(S6, S7, S8)에서는 엔진제어유니트(30)가 기준 실린더(1번 실린더)의 최고연소압력위치에서 다른 실린더들(3번, 4번 2번 실린더)의 최고연소압력위치를 빼서 다른 실린더들(3번, 4번 2번 실린더)의 연료분사시기 보정치를 각각 구한다.Then, in steps S6, S7 and S8, the engine control unit 30 moves the highest combustion pressure position of the other cylinders (cylinders 3 and 4 and 2) from the highest combustion pressure position of the reference cylinder (cylinder 1). Subtract the fuel injection timing correction values for the other cylinders (cylinders 3 and 4).

이어서, 단계(S9)에서 엔진제어유니트(30)는 상기와 같이 구해진 연료분사시기 보정치를 기본 연료분사시기 맵에 따라 결정된 다른 실린더들(3번, 4번, 2번 실린더)의 기본 연료분사시기에 더하여 최종 연료분사시기를 결정하고 이 최종 연료분사시기에 따라 연료를 각 실린더내로 분사하도록 인젝터들(52, 54, 56, 58)을 제어한다.Subsequently, in step S9, the engine control unit 30 performs the basic fuel injection timing of the other cylinders (cylinders 3, 4, 2) determined according to the basic fuel injection timing map obtained as described above. In addition, the final fuel injection timing is determined and the injectors 52, 54, 56, 58 are controlled to inject fuel into each cylinder according to the final fuel injection timing.

즉 1번 실린더는 기본 연료분사시기 맵에 따라 연료분사시기가 결정되며, 2번, 3번, 4번 실린더들은 최고연소압력위치에 따라 진각 또는 지각되어 연료분사시기가 결정되는 것이다.That is, cylinder 1 is fuel injection timing is determined according to the basic fuel injection timing map, and cylinders 2, 3, and 4 are advanced or latent depending on the maximum combustion pressure position to determine the fuel injection timing.

이상에서 설명한 바와 같이 본 발명에 따르면, 엔진의 블록에 진동센서를 장착하여 각 실린더별로 최고연소압력위치를 검출한 후 기준 실린더를 정하고 이와 차이가 발생하는 실린더의 분사시기를 조정함으로써, 연료분사시기의 편차를 줄일 수 있어 엔진에서 발생하는 불규칙한 진동을 감소시킬 수 있는 효과가 있다. As described above, according to the present invention, by mounting the vibration sensor on the engine block to detect the highest combustion pressure position for each cylinder, and then determine the reference cylinder and adjust the injection timing of the cylinder that the difference occurs, fuel injection timing It can reduce the deviation of the has the effect of reducing the irregular vibration generated in the engine.

도 1은 본 발명에 따른 연료분사시기 보정장치의 블록 구성도,1 is a block diagram of a fuel injection timing correction apparatus according to the present invention,

도 2는 본 발명에 따른 연료분사시기 보정방법의 순서도이다.2 is a flow chart of a fuel injection timing correction method according to the present invention.

도 3은 본 발명에서 최고연소압력위치를 검출하는 방법을 설명하기 위한 도면이다.3 is a view for explaining a method of detecting the highest combustion pressure position in the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

10 : 진동센서 20 : 진동센서10: vibration sensor 20: vibration sensor

30 : 엔진제어유니트 40 : 기본 연료분사시기 맵30: engine control unit 40: basic fuel injection timing map

52, 54, 56, 58 : 인젝터52, 54, 56, 58: injector

Claims (2)

엔진의 실린더 블록에 설치되어 각 실린더의 최고연소압력위치를 검출하는 진동센서와; 기준 실린더의 최고연소압력위치와 다른 실린더들의 최고연소압력위치를 비교하여 연료분사시기 보정치를 구하고, 이 연료분사시기 보정치를 바탕으로 상기 다른 실린더들의 기본 연료분사시기를 진각 또는 지각시켜서 최종 연료분사시기를 결정하는 엔진제어유니트와; 상기 엔진제어유니트에 의해 결정된 최종 연료분사시기에 따라 연료를 각 실린더내로 분사하는 인젝터들을 포함하여 구성된 것을 특징으로 하는 연료분사시기 보정장치.A vibration sensor installed in the cylinder block of the engine to detect the highest combustion pressure position of each cylinder; The fuel injection timing correction value is obtained by comparing the highest combustion pressure position of the reference cylinder with the highest combustion pressure position of the other cylinders, and the final fuel injection timing is made by advancing or retarding the basic fuel injection timing of the other cylinders based on the fuel injection timing correction value. An engine control unit for determining; And an injector for injecting fuel into each cylinder according to the final fuel injection timing determined by the engine control unit. 기본 연료분사시기 맵에 따라 엔진으로 연료분사를 수행하는 단계와; 엔진의 각 실린더의 최고연소압력위치를 검출하는 단계와; 기준 실린더의 최고연소압력위치에서 다른 실린더들의 최고연소압력위치를 빼서 연료분사시기 보정치를 구하는 단계와; 상기 연료분사시기 보정치를 기본 연료분사시기 맵에 따라 결정된 다른 실린더들의 기본 연료분사시기에 더하여 최종 연료분사시기를 결정하고 이 최종 연료분사시기에 따라 연료를 각 실린더내로 분사하는 단계를 포함하여 구성된 것을 특징으로 하는 연료분사시기 보정방법. Performing fuel injection with an engine according to the basic fuel injection timing map; Detecting a maximum combustion pressure position of each cylinder of the engine; Obtaining a fuel injection timing correction value by subtracting the highest combustion pressure position of the other cylinders from the highest combustion pressure position of the reference cylinder; Determining the final fuel injection timing in addition to the basic fuel injection timing of the other cylinders determined according to the basic fuel injection timing map, and injecting fuel into each cylinder according to the final fuel injection timing. A fuel injection timing correction method characterized by the above-mentioned.
KR1020030068683A 2003-10-02 2003-10-02 Fuel injection timing compensating apparatus and method KR20050032740A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101316281B1 (en) * 2011-12-13 2013-10-08 아주대학교산학협력단 Method for controlling of combustion in diesel engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101316281B1 (en) * 2011-12-13 2013-10-08 아주대학교산학협력단 Method for controlling of combustion in diesel engine
US8849549B2 (en) 2011-12-13 2014-09-30 Hyundai Motor Company Method of controlling combustion of diesel engine

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