KR930003082B1 - Back fire predeption device in engine - Google Patents
Back fire predeption device in engine Download PDFInfo
- Publication number
- KR930003082B1 KR930003082B1 KR1019900022954A KR900022954A KR930003082B1 KR 930003082 B1 KR930003082 B1 KR 930003082B1 KR 1019900022954 A KR1019900022954 A KR 1019900022954A KR 900022954 A KR900022954 A KR 900022954A KR 930003082 B1 KR930003082 B1 KR 930003082B1
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- South Korea
- Prior art keywords
- signal
- sensor
- ecu
- engine
- backfire
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P11/00—Safety means for electric spark ignition, not otherwise provided for
- F02P11/06—Indicating unsafe conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D7/00—Other fuel-injection control
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fire-Detection Mechanisms (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
제 1 도는 본 발명에 따른 역화감지장치의 센서위치를 보인 설명도.1 is an explanatory view showing the sensor position of the flashback detection apparatus according to the present invention.
제 2 도는 본 발명에 따른 역화감지장치의 블록도.2 is a block diagram of a backfire detection apparatus according to the present invention.
제 3 도는 본 발명의 동작흐름도.3 is a flow chart of the present invention.
제 4 도는 본 발명의 센서신호의 타임차트4 is a time chart of the sensor signal of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 파형정형회로 2 : ECU1: waveform shaping circuit 2: ECU
3 : 경보표시부 10 : 광학센서3: alarm display 10: optical sensor
20 : 캠축위치센서 30 : 크랭크각센서20: Camshaft position sensor 30: Crank angle sensor
40 : 흡기관40: intake pipe
본 발명은 연료계의 과농한 혼합기가 공급되거나, 밸브 타이밍계에 이상이 있을 때 흡기 다기관쪽으로 화염이 발생하는 것을 감지하여 역화가 발생한 실린더를 판별하여 경보하는 역화(Back fire) 감지장치에 관한 것이다.The present invention relates to a back fire detection device that detects a flame occurring toward an intake manifold when an excessive mixer of a fuel system is supplied or an abnormality occurs in a valve timing system, and determines a cylinder in which a backfire has occurred. .
역화란 과농한 연료공급이나 점화장치의 고장 및 밸브 개폐시기의 부적절 등으로 흡기관내로 화염이 발생하는 이상연소 현상이다.Backfire is an abnormal combustion phenomenon in which a flame is generated in the intake pipe due to excessive fuel supply, failure of an ignition device, and improper valve opening and closing.
종래에는 역화방지를 위하여 엔진의 크랭크축의 회전 각속도 변동을 감지하여 역화 발생을 알아내었다.Conventionally, in order to prevent backfire, a change in rotational angular velocity of the crankshaft of the engine is detected to find out the occurrence of backfire.
이와같은 방법은 차량이 노면상태가 불규칙한 도로를 주행할 때 에러가 유발되어 역화감지에 대한 신뢰성이 문제가 되며, 엔진의 회전각속도를 감지하는 크랭크각 센서가 플라이휠부에 장착되지 않은 사항양은 별도의 센서를 추가 해야만 되는 문제점이 있었다.This method causes an error when the vehicle is driving on an irregular road surface, so that the reliability of the flashback detection is a problem. There was a problem to add a sensor.
그러므로 본 발명의 목적은 역화발생을 직접 검출하여 역화가 발생한 실린더를 판별하여 경보하는 역화감지 장치를 제공하는 데 있다.It is therefore an object of the present invention to provide a backfire detection device that detects backfire directly and determines and alerts the cylinder on which backfire occurred.
이하, 본 발명을 첨부된 도면 제 1 도 내지 제 4 도를 참조하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 4.
제 1 도는 본 발명에 따른 역화감지 장치의 센서위치를 보인 것으로, 흡기관(40)내의 일측부위에 장착되어 역화가 발생했을 경우, 빛을 감지하여 전기신호로 변환하는 광학센서(10)와, 엔진의 1사이클 시작을 구분하는 신호를 발생하는 캠축 위치센서(20)와, 크랭크축의 각도 및 엔진 회전수를 감지하는 크랭크센서(30)와, 상기 각 센서(10, 20, 30)의 센싱신호를 컨트롤 유니트(이하 ECU라함)(2)에 입력가능한 신호로 변화하는 파형 정형회로(1)와, 상기 파형정형회로(1)를 통한 각 센서신호의 입력에 따라 역화발생 실린더를 감지하여 경보신호를 출력하는 ECU(2)와 상기 ECU(2)의 경보신호에 따라 역화 상태를 기억코드 또는 운전자가 알수 있도록 경고표시를 하는 경보표시장치(3)로 구성된다.1 is a view illustrating a sensor position of a backfire detection device according to the present invention, and is mounted on one side of an intake pipe 40 and, when a backfire occurs, an optical sensor 10 for detecting light and converting the light into an electrical signal; Camshaft position sensor 20 for generating a signal that distinguishes the start of one cycle of the engine, crank sensor 30 for detecting the angle and engine speed of the crankshaft, and sensing signals of the sensors 10, 20, and 30 Is converted into a signal that can be input to a control unit (hereinafter referred to as an ECU) 2 and an alarm signal is detected by detecting a backfire cylinder according to the input of each sensor signal through the waveform shaping circuit 1. And an alarm display device (3) for displaying a warning so that the driver can know the flashing state according to the alarm signal of the ECU (2) for outputting the flash signal.
이와같이 구성된 본 발명의 동작을 제 3 도 및 제 4 도를 참조하여 살펴보면, 제 3 도는 본 발명의 동작흐름도이며 제 4 도는 본 발명의 센서신호의 타임차트이다.The operation of the present invention configured as described above will be described with reference to FIGS. 3 and 4, where FIG. 3 is an operational flowchart of the present invention and FIG. 4 is a time chart of the sensor signal of the present invention.
엔진의 시동과 동시에 ECU(2)는 광학센서(10), 크랭크각센서(30), 캠축센서(20) 및 도시하지 않은 흡입공기량 센서와, 냉각수온센서 등의 각종 센서에서 보내어진 정보를 기본으로 하여 거의 순간적으로 최적의 혼합비와 점화시기를 계산하고 그 답을 얻어 엔진을 이상적으로 운전을 행하던 중에, 점화장치의 고장등으로 역화가 발생하면 흡기관(40)쪽으로 화염이 발생되고, 이를 흡기관 일측부위에 장착된 광학센서(10)가 감지하여 파형정형회로(1)에 입력하면, 상기 파형정형회 로(1)는 입력신호를 ECU(2)에 입력 가능한 신호로 파형을 정형하여 ECU(2)에 입력한다. 상기 ECU(2)는 입력된 센서신호를 다른 센서입력을 기초로 한 운전 조건에서의 정상상태의 광학센서(10)신호와 비교하며, 비교결과 현재의 센서입력값이 정상상태의 센서입력값보다 일정값 이상이면 역화상태로 판단한다.At the same time as the engine is started, the ECU 2 is based on information sent from various sensors such as an optical sensor 10, a crank angle sensor 30, a camshaft sensor 20, an intake air quantity sensor (not shown), and a coolant temperature sensor. Calculate the optimum mixing ratio and ignition timing almost instantaneously and get the answer. During the ideal operation of the engine, if a backfire occurs due to a failure of the ignition device, a flame is generated toward the intake pipe 40. When the optical sensor 10 mounted on one side of the engine senses and inputs the waveform to the waveform shaping circuit 1, the waveform shaping circuit 1 forms a waveform into a signal that can be input to the ECU 2. Enter in (2). The ECU 2 compares the input sensor signal with the optical sensor 10 signal in a steady state under operating conditions based on other sensor inputs, and as a result of comparison, the current sensor input value is higher than the normal sensor input value. If it is over a certain value, it is determined as a backfire state.
또한, 역화발생 신호를 검출했을 때의 기간중에 발생한 실린더 판별신호(제 4 도의 다)를 감지하여 역화가 발생한 실린더 번호를 판단하여 이를 경보표시부(3)에 디스플레이한다.In addition, the cylinder discrimination signal (C in FIG. 4) generated during the period when the backfire signal is detected is determined to determine the cylinder number on which the backfire has occurred, and is displayed on the alarm display unit 3.
제 4 도에서 a는 역화상태일 때의 화염을 광학센서가 감지하고 파형정형후 ECU(2)에 입력되는 광학센서(10)신호이며, b는 캠축위치센서(20)가 캠축 1회전당 1개의 펄스신호를 발생하여 ECU(2)가 1사이클의 시작을 구분할 수 있게 파형정형한 신호이며, c는 크랭크각 센서(30)가 크랭크축의 회전위치를 감지하여 파형정형을 하고, 기통식별을 쉽게 하기위하여, 기통수를 N이라했을 때 크랭크각 신호 펄스수를 분주회로를 사용하여 N분주를 한 실린더 판별신호이다.In FIG. 4, a is an optical sensor 10 signal which is detected by the optical sensor when the flame is in a flashing state and is input to the ECU 2 after waveform shaping, and b is a cam shaft position sensor 20 which is 1 per rotation of the cam shaft. Is a waveform shaping signal so that the ECU 2 can distinguish the start of one cycle by generating two pulse signals, and c denotes a waveform by the crank angle sensor 30 detecting the rotational position of the crankshaft, and easily identifies the cylinder. In the following, when the number of cylinders is N, the number of crank angle signal pulses is a cylinder discrimination signal in which N division is performed using a division circuit.
만약, ECU(2)가 캠축위치센서(20) 신호펄스가 발생하고 다음 펄스가 발생할 때까지 즉, 1주기동안 역화와 정상을 판단하여 역화발생 신호를 감지하게 되면 역화발생 기간동안 발생한 실린더 판별신호를 감지하여 역화가 발생한 실린더 번호를 경보표시부(3)로 출력한다.If the ECU 2 detects the backfire signal until the camshaft position sensor 20 signal pulse is generated and the next pulse is generated, that is, it determines the backfire and normal for one cycle, the cylinder discrimination signal generated during the backfire period. Detects and outputs the cylinder number where backfire occurred to the alarm display unit (3).
이와 같은 본 발명은 운전자가 역화발생을 일으킨 엔진의 기통을 조기에 파악하여 조처함으로써 엔진수명을 연장할 수 있고, 엔진의 검사, 정비, 수리비를 절감할 수 있다.The present invention can extend the engine life by early detection and action of the engine cylinder causing the flashback, and can reduce the inspection, maintenance, and repair costs of the engine.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019900022954A KR930003082B1 (en) | 1990-12-31 | 1990-12-31 | Back fire predeption device in engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019900022954A KR930003082B1 (en) | 1990-12-31 | 1990-12-31 | Back fire predeption device in engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR920012734A KR920012734A (en) | 1992-07-27 |
| KR930003082B1 true KR930003082B1 (en) | 1993-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019900022954A KR930003082B1 (en) | 1990-12-31 | 1990-12-31 | Back fire predeption device in engine |
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| Country | Link |
|---|---|
| KR (1) | KR930003082B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100526784B1 (en) * | 2002-07-02 | 2005-11-08 | 기아자동차주식회사 | Device for Preventing Damage of Air Cleaner in Case of Back Fire of LPG Vehicels |
-
1990
- 1990-12-31 KR KR1019900022954A patent/KR930003082B1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR920012734A (en) | 1992-07-27 |
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