KR100258446B1 - Starting method of misfiring cold starting - Google Patents

Starting method of misfiring cold starting Download PDF

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Publication number
KR100258446B1
KR100258446B1 KR1019960076127A KR19960076127A KR100258446B1 KR 100258446 B1 KR100258446 B1 KR 100258446B1 KR 1019960076127 A KR1019960076127 A KR 1019960076127A KR 19960076127 A KR19960076127 A KR 19960076127A KR 100258446 B1 KR100258446 B1 KR 100258446B1
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South Korea
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fuel
starting
cranking
engine
fuel supply
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KR1019960076127A
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Korean (ko)
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KR19980056857A (en
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고성석
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정몽규
현대자동차주식회사
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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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • 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
    • F02D41/3082—Control of electrical fuel pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/003—Starting of engines by means of electric motors said electric motor being also used as a drive for auxiliaries, e.g. for driving transmission pumps or fuel pumps during engine stop

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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

PURPOSE: A starting method in case of inferior cold starting is provided to prevent the inferior starting of an engine by a wet spark plug due to the excessive fuel supply in case of cold starting by reducing the fuel supply amount for the engine and drying a spark plug by engine monitoring. CONSTITUTION: A starting method in case of inferior cold starting includes the steps of determining a cold starting state by an ECU and determining a cranking fuel supply amount, carrying out cranking operation by driving a cranking motor in a fuel supply state and igniting by using an ignition plug, maintaining a running standby state as an engine is started while turning off a fuel pump after a predetermined time period in the other case, carrying out the monitoring of the engine by using the cranking motor while the fuel pump is turned off, and turning on the fuel pump for supplying fuel after the monitoring of a predetermined time period and starting the engine.

Description

냉시동불량시의 시동방법How to start during cold start

본 발명은 차량의 냉시동(冷始動)시의 시동불량을 해소하기 위한 방법에 관한 것으로서, 더욱 구체적으로는 냉시동시에 크랭킹 연료의 과다공급으로 인하여 스파크플러그가 젖어서 발생되는 시동불량을 방지하기 위하여 연료공급량을 조정하고 엔진 모터링을 수행하여 스파크플러그를 건조시키는 냉시동불량시의 시동방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for resolving starting failure during cold start of a vehicle, and more particularly, to prevent starting failure caused by a spark plug being wet due to excessive supply of cranking fuel during cold starting. The present invention relates to a method of starting during a cold start failure in which a spark plug is dried by adjusting a fuel supply amount and performing engine motoring.

일반적으로 차량의 시동을 거는 경우에 있어서 냉시동상태에서는 크랭킹에 사용되는 연료량을 증가시켜 충분한 열량을 확보하여 시동을 걸고 있다. 이것은 주행상태보다 더욱 많은 연료량이 공급됨을 의미하며 냉시동시에 시동불량의 한 요인이 되고 있다.In general, in the case of starting the vehicle, in the cold starting state, the amount of fuel used for cranking is increased to secure sufficient heat quantity to start the vehicle. This means that more fuel is supplied than the driving state, which is a cause of starting failure during cold start.

즉, 크랭킹 연료공급량이 과다하게 제공되므로 연료를 점화하기 위한 스파크플러그(Spark Plug)가 연료에 의하여 젖어서 충분한 스파크를 발생시키지 못하므로 시동이 걸리지 않는 문제가 자주 발생되었다.That is, since the cranking fuel supply amount is excessively provided, spark plugs for igniting the fuel are frequently wetted by the fuel and thus do not generate enough sparks.

그러나 종래에는 도 1에 도시된 바와 같이, 연료펌프의 작동시간과 크랭킹시간은 항상 일정하게 유지되며, 또한 크랭킹연료공급량도 일정하게 유지되므로 일단 스파크플러그가 젖으면 시동이 불가능하여 스파크플러그가 건조될 때 까지 장시간동안 기다려야 하는 문제점이 있었다. 이것은 특히 동절기에 자주 발생되므로 소비자불만의 한요인이 되었던 것이다.However, conventionally, as shown in FIG. 1, the operating time and the cranking time of the fuel pump are always kept constant, and the supply amount of the cranking fuel is kept constant, so once the spark plug is wet, it is impossible to start the spark plug. There was a problem of waiting for a long time to dry. This was especially a factor during the winter months, which was a factor in consumer complaints.

본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 본 발명의 목적은 냉시동시에 스파크플러그가 과다하게 공급되는 연료에 의하여 젖어서 시동이 불량한 것을 방지하여 시동이 즉시 걸릴 수 있도록 하는 냉시동불량시의 시동방법을 제공하는데 있다.The present invention has been made in order to solve the above problems, an object of the present invention is to prevent the start-up poor start-up poor cold start by wet fuel by excessively supplied spark plug during cold start To provide a way to start.

상기 목적을 달성하기 위한 본 발명의 냉시동불량시의 시동방법은, 차량의 시동방법에 있어서, 냉시동상태인가를 ECU(2)에서 판단하고 크랭킹연료공급량을 결정하는 제1단계, 연료가 공급되는 상태에서 크랭킹모터(8)를 작동시켜 크랭킹동작을 수행하고 점화플러그(6)를 사용하여 점화시키는 제2단계, 시동이 걸리면 주행대기상태를 유지하며, 시동이 걸리지 않으면 일정시간의 경과후에 연료펌프(4)를 오프시키는 제3단계, 연료펌프(4)가 오프된 상태에서 엔진의 모터링을 크랭킹모터(8)를 사용하여 수행하는 제4단계, 소정시간동안 모터링을 수행하고 연료펌프(4)를 다시 온시켜 연료를 공급하고 시동을 걸어주는 제5단계로 구성되는 것을 특징으로 한다.In the cold start failure start method of the present invention for achieving the above object, in the start method of the vehicle, the first step in which the ECU (2) determines whether the cold start state and the supply amount of cranking fuel, The second step of performing the cranking operation by operating the cranking motor (8) in the supplied state and ignition by using the spark plug (6), the running standby state is maintained when starting, and if the start is not After the elapsed time, the third step of turning off the fuel pump 4, the fourth step of performing motoring of the engine using the cranking motor 8 while the fuel pump 4 is off, and the motoring for a predetermined time It is characterized in that it consists of a fifth step of supplying fuel and starting the fuel pump (4) again.

도 1은 종래 차량에서의 냉시동시의 제어변수의 상태를 도시한 그라프,1 is a graph showing the state of the control variable during cold start in a conventional vehicle,

도 2는 본 발명의 방법에 의한 제어변수의 상태를 도시한 그라프,Figure 2 is a graph showing the state of the control variable by the method of the present invention,

도 3은 본 발명의 방법이 적용되는 차량의 부분블럭회로도,3 is a partial block circuit diagram of a vehicle to which the method of the present invention is applied;

도 4는 본 발명의 방법을 설명하기 위한 플로우차트이다.4 is a flowchart for explaining the method of the present invention.

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

2 : ECU 4 : 연료펌프2: ECU 4: Fuel Pump

6 : 점화플러그 8 : 크랭킹모터6: spark plug 8: cranking motor

이하 첨부된 도면을 참고하여 본 발명의 냉시동불량시의 시동방법을 상세히 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings will be described in detail the starting method during cold start failure of the present invention.

본 발명의 방법은 냉시동시에 발생되는 시동불량을 해소하기 위한 것으로서, 통상적으로 냉시동시에 과다연료공급에 의하여 스파크플러그가 젖어서 발생되는 점화불량을 해소할 수 있는 방법이다. 본 발명의 방법의 특징을 간략히 설명하면, 엔진으로 공급되는 연료공급량을 조정하고, 또한 스파크플러그를 엔진모터링을 이용하여 건조시킴으로서 신속하게 시동을 걸수 있는 방법인 것이다.The method of the present invention is to solve the starting failure generated during cold startup, and is a method that can eliminate the ignition failure caused by the spark plug being wet by the excessive fuel supply during the cold startup. Briefly describing the features of the method of the present invention, it is a method that can be started quickly by adjusting the amount of fuel supplied to the engine and drying the spark plug using engine motoring.

본 발명의 방법은 다음과 같은 단계 : 냉시동상태인가를 ECU(2)에서 판단하고 크랭킹연료공급량을 결정하는 제1단계, 연료가 공급되는 상태에서 크랭킹모터(8)를 작동시켜 크랭킹동작을 수행하고 점화플러그(6)를 사용하여 점화시키는 제2단계, 시동이 걸리면 주행대기상태를 유지하며, 시동이 걸리지 않으면 일정시간의 경과후에 연료펌프(4)를 오프시키는 제3단계, 연료펌프(4)가 오프된 상태에서 엔진의 모터링을 크랭킹모터(8)를 사용하여 수행하는 제4단계, 소정시간동안 모터링을 수행하고 연료펌프(4)를 다시 온시켜 연료를 공급하고 시동을 걸어주는 제5단계로 구성된다.The method of the present invention comprises the following steps: a first step in which the ECU 2 determines whether it is in a cold start state and determines the amount of cranking fuel supply, and cranking by operating the cranking motor 8 in a state where fuel is supplied. The second step of performing the operation and igniting using the spark plug 6, the start standby state when the start is started, the third step of turning off the fuel pump 4 after a certain period of time if the start is not started, the fuel In the fourth step of performing the motoring of the engine using the cranking motor 8 while the pump 4 is turned off, the motoring is performed for a predetermined time and the fuel pump 4 is turned on again to supply fuel. It consists of a fifth stage of starting.

냉시동인가 아닌가의 판단은 통상 냉각수의 수온을 감지하여 측정하게 되며 냉시동상태로 판단되면 연료펌프의 작동상태를 변경하여 연료공급량을 증가시켜 시동을 걸게 된다. 그러나 이 때 공급되는 연료에 의하여 스파크플러그가 젖는 경우가 발생된다.Determination of whether or not cold start is usually measured by measuring the water temperature of the coolant, and if it is determined that the cold start state is changed to the operating state of the fuel pump to increase the fuel supply amount to start. However, the spark plug is wetted by the fuel supplied at this time.

본 발명의 방법에서는 냉시동상태에서 종래 사용되는 것과 동일하게 증가된 연료량을 공급하게 된다. 그 후에 역시 정상적으로 크랭킹모터(8)를 작동시켜 크랭킹동작을 수행한다. 또한 스파크플러그(6)에서도 점화사이클에 맞추어서 점화를 수행한다.In the method of the present invention, the fuel amount is increased in the same manner as conventionally used in the cold start state. After that, the cranking motor 8 is normally operated to perform the cranking operation. The spark plug 6 also performs ignition in accordance with the ignition cycle.

만일 점화가 정상적으로 달성되면 시동이 걸림을 ECU(2)에서 감지하고 주행대기상태가 된다.If the ignition is normally achieved, the ECU 2 detects that the start is stopped and enters the travel standby state.

그러나 상기에서와 같이 스파크플러그(6)가 젖어서 점화가 되지 않으면 일정시간이 경과한 후에 ECU(2)에서 제어신호전압을 출력하여 연료펌프(4)를 오프시킨다. 따라서 연료공급이 차단되며, 스파크플러그(6)가 연료에 의하여 더 이상 젖게 되는 것을 방지한다. 상기 시간은 설계시에 임의의 시간으로 결정할 수 있다.However, if the spark plug 6 is not wet and does not ignite as described above, after a predetermined time elapses, the ECU 2 outputs a control signal voltage to turn off the fuel pump 4. Therefore, the fuel supply is cut off, and the spark plug 6 is prevented from getting wet by the fuel anymore. The time can be determined at any time in design.

본 발명에서는 이 때에도 크랭킹모터(8)를 사용하여 엔진의 모터링(크랭킹) 동작을 계속 수행한다. 이렇게 모터링을 수행함으로서 발생되는 온도의 상승에 의하여 스파크플러그(6)가 건조되는 효과가 있는 것이다.In the present invention, the motor cranking operation of the engine is continued using the cranking motor 8 at this time. In this way, the spark plug 6 is dried by an increase in temperature generated by the motoring.

연료펌프(4)의 오프도 역시 임의로 결정될 수 있는 소정시간동안 수행된다. 소정시간이 경과하면 ECU(2)에서는 제어신호전압을 출력하여 연료펌프(4)를 동작시켜 다시 연료를 공급하기 시작한다. 상기 연료공급량은 정상적으로 설정된 연료공급량을 공급하거나 또는 스파크플러그(6)가 젖지 않은 정도의 연료공급량을 설정하여 공급한다.Off of the fuel pump 4 is also performed for a predetermined time, which can also be arbitrarily determined. When a predetermined time elapses, the ECU 2 outputs a control signal voltage to operate the fuel pump 4 to start supplying fuel again. The fuel supply amount is supplied by supplying a fuel supply amount which is normally set or by setting a fuel supply amount such that the spark plug 6 is not wet.

이렇게 연료공급량을 감소시킴으로서 스파크플러그가 건조되고 다시 젖지 않으므로 점화가 성공하여 시동이 걸릴 확률은 증가한다. 또한 먼저번에서의 시동시에 어느 정도 온도가 상승하였기 때문에 냉시동상태에서 벗어난 상태가 되므로 시동이 걸린 확률은 더욱 높아지는 것이다.By reducing the fuel supply, the spark plug dries and does not get wet again, which increases the probability that the ignition will succeed and start. In addition, since the temperature has risen to some extent during the first start, the state is out of the cold start state, so the probability of starting the start is higher.

만일 연료공급량을 감소시켜서 공급하고 시동을 걸어도 시동이 걸리지 않는 경우에는 본 발명에서는 상기 제3단계부터 다시 수행하여 연료공급량을 한 단계 더 낮추어준다. 이렇게 함으로서, 시동이 걸릴 확률은 더욱 높아지게 된다.If the fuel supply is reduced and supplied and the engine does not start even when the engine is started, the fuel supply is further reduced by performing the above-described third step. By doing this, the probability of starting up becomes even higher.

상기와 같이 본 발명의 냉시동불량시의 시동방법에 의하면, 냉시동시에 스파크플러그가 연료에 의하여 젖어서 시동이 불량한 것을 방지할 수 있는 이점이 있는 것이다.As described above, according to the starting method during the cold start failure of the present invention, the spark plug is wetted by the fuel during the cold start, and thus there is an advantage that the starting can be prevented from being poor.

본 발명은 기재된 구체예에 대해서만 상세히 설명되었지만 본 발명의 사상과 범위내에서 변형이나 변경할 수 있음은 본 발명이 속하는 분야의 당업자에게는 명백한 것이며, 그러한 변형이나 변경은 첨부한 특허청구범위에 속한다 할 것이다.Although the invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that modifications and variations can be made within the spirit and scope of the invention, and such variations or modifications will belong to the appended claims. .

Claims (3)

차량의 시동방법에 있어서, 냉시동상태인가를 ECU(2)에서 판단하고 크랭킹연료공급량을 결정하는 제1단계, 연료가 공급되는 상태에서 크랭킹모터(8)를 작동시켜 크랭킹동작을 수행하고 점화플러그(6)를 사용하여 점화시키는 제2단계, 시동이 걸리면 주행대기상태를 유지하며, 시동이 걸리지 않으면 일정시간의 경과후에 연료펌프(4)를 오프시키는 제3단계, 연료펌프(4)가 오프된 상태에서 엔진의 모터링을 크랭킹모터(8)를 사용하여 수행하는 제4단계 및 소정시간동안 모터링을 수행하고 연료펌프(4)를 온시켜 연료를 공급하고 시동을 걸어주는 제5단계로 구성되는 것을 특징으로 하는 냉시동불량시의 시동방법.In the vehicle starting method, a first step of judging whether or not a cold start state is performed by the ECU 2 and determining a cranking fuel supply amount, and performs a cranking operation by operating the cranking motor 8 in a state where fuel is supplied. And the second stage of ignition using the ignition plug 6, the running standby state when the start is started, and the third stage of turning off the fuel pump 4 after a predetermined time when the start is not started, the fuel pump 4 ) Is the fourth step of performing the motoring of the engine using the cranking motor (8) and the motoring for a predetermined time and turning on the fuel pump (4) to supply fuel and start Start-up method during cold start failure, characterized in that the fifth step. 제1항에 있어서, 상기 제5단계에서 연료공급량이 제1단계에서의 초기연료공급량보다 감소되어서 공급되는 것을 특징으로 하는 냉시동불량시의 시동방법.The start method according to claim 1, wherein the fuel supply amount is reduced in the fifth step than the initial fuel supply amount in the first step. 제1항에 있어서, 상기 제3단계 및 제4단계가 시동이 걸릴 때 까지 계속 수행되는 것을 특징으로 하는 냉시동불량시의 시동방법.The start method according to claim 1, wherein the third step and the fourth step are continuously performed until starting.
KR1019960076127A 1996-12-30 1996-12-30 Starting method of misfiring cold starting KR100258446B1 (en)

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Publication number Priority date Publication date Assignee Title
KR100423310B1 (en) * 2001-07-31 2004-03-18 현대자동차주식회사 Method for cool starting control of engine in vehicle

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KR100820495B1 (en) * 2006-08-09 2008-04-10 현대자동차주식회사 Cold cracking method for hybrid electronic vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100423310B1 (en) * 2001-07-31 2004-03-18 현대자동차주식회사 Method for cool starting control of engine in vehicle

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