KR100251205B1 - Method of misfire control - Google Patents

Method of misfire control Download PDF

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Publication number
KR100251205B1
KR100251205B1 KR1019970031918A KR19970031918A KR100251205B1 KR 100251205 B1 KR100251205 B1 KR 100251205B1 KR 1019970031918 A KR1019970031918 A KR 1019970031918A KR 19970031918 A KR19970031918 A KR 19970031918A KR 100251205 B1 KR100251205 B1 KR 100251205B1
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Prior art keywords
misfire
engine
angular acceleration
threshold value
generation
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KR1019970031918A
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Korean (ko)
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KR19990009498A (en
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박재홍
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정몽규
현대자동차주식회사
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Priority to KR1019970031918A priority Critical patent/KR100251205B1/en
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    • 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
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • F02P17/02—Checking or adjusting ignition 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/11—Testing internal-combustion engines by detecting misfire

Abstract

PURPOSE: An engine misfire controlling method is provided to determine a misfire according to an angular acceleration and system fail by checking the frequency of the misfire generation for prompt checking of the reasons of the misfire, thereby minimizing the generation of the harmful exhaust due to the misfire. CONSTITUTION: An engine misfire controlling method includes the steps of operating an angular acceleration of a crank shaft to determine the generation of a misfire if the operated angular acceleration is lower than a threshold value, determining a system fail in which harmful exhaust gas is generated 1.5 times more than a threshold value if a misfire ratio is higher than 2.2% at 1000 times or more rotation of the crank shaft, determining a system fail in which a catalyst is damaged if the misfire ratio exceeds the threshold value at 200-1000 times rotation, and stopping the determination regardless of the generation of misfire under 200 times rotation, wherein the threshold value is determined by an engine rpm and an engine load.

Description

엔진 실화 제어 방법How to control engine misfire

본 발명은 배기 가스내의 유해 배기 가스의 발생량을 저감시키기 위하여 엔진의 작동 상태를 점검하는 방법에 관한 것으로서, 특히 엔진의 실화 발생 여부를 확인하여 엔진 상태를 점검하는 엔진 실화 제어 방법에 관한 것이다.The present invention relates to a method for checking an operating state of an engine in order to reduce the amount of harmful exhaust gas in exhaust gas, and more particularly, to an engine misfire control method for checking an engine state by checking whether an engine misfire occurs.

엔진에서 발생되는 유해 배기 가스의 양을 저감시키기 위하여 여러 가지 방법을 사용하고 있다. 배기 가스를 재순환시켜 연소 온도를 낮춤으로써 질소산화물의 발생량을 감소시키거나, 촉매 컨버터를 이용하여 배기 가스를 산화/환원시킴으로써 유해 배기 가스를 저감시키고 있다.Various methods are used to reduce the amount of harmful exhaust gas generated in an engine. By reducing the combustion temperature by recirculating the exhaust gas, the amount of nitrogen oxide generated is reduced, or toxic exhaust gas is reduced by oxidizing / reducing the exhaust gas using a catalytic converter.

또한, 엔진에서 실화가 발생될 경우 다량의 유해 배기 가스가 발생되므로, 실화 발생 여부를 감지하고 있다. 즉, 실화가 발생되면 운전자에게 경고하여 실화 발생 요인을 제거하도록 함으로써 유해 배기 가스가 발생되지 않도록 하고 있다.In addition, since a large amount of harmful exhaust gas is generated when a misfire occurs in the engine, it is detected whether misfire has occurred. That is, when a misfire occurs, the driver is warned to remove the misfire occurrence factor so that no harmful exhaust gas is generated.

그러나, 엔진에서의 실화 발생 여부에 대한 확인이 곤란하고 실화가 발생되더라도 항상 엔진을 점검할 수는 없으므로 실화 발생에 의한 유해 가스 발생량을 저감시키기가 어려운 문제점이 있다.However, it is difficult to confirm whether or not a misfire has occurred in the engine, and even if a misfire occurs, it is difficult to always check the engine, so it is difficult to reduce the amount of harmful gas generated by misfire.

따라서, 북미의 배기 가스 규제중 하나인 OBD-Ⅱ는 실화 발생 여부를 모니터링하도록 요구하고 있다.Therefore, OBD-II, one of North America's exhaust gas regulations, requires monitoring the occurrence of misfire.

본 발명은 상기한 문제점을 해결하기 위하여 안출된 것으로서, 각가속도를 이용하여 실화 여부를 판정함과 아울러 실화 발생의 빈도를 확인하여 시스템의 고장 여부를 판정함으로써, OBD-Ⅱ의 규제 조항을 만족시키고 사용자가 고장 항목을 재빨리 확인토록 하여 유해 배기 가스의 발생량이 저감되도록 하는 엔진 실화 제어 방법을 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, by using the angular acceleration to determine whether the misfire and the frequency of occurrence of misfire to determine whether the system failure, satisfying the regulatory provisions of OBD-II and users It is an object of the present invention to provide an engine misfire control method that enables a quick check of a fault item so that the amount of harmful exhaust gas is reduced.

도 1은 크랭크샤프트의 각가속도의 변화 상태가 개략적으로 도시된 도표이고,1 is a diagram schematically showing a change state of the angular acceleration of the crankshaft,

도 2는 본 발명에 의한 엔진 실화 제어 방법이 도시된 순서도이다.2 is a flowchart illustrating an engine misfire control method according to the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

An : 각가속도 TH : 각가속도 규정치An: Angular acceleration TH: Angular acceleration regulation

Rmf : 실화율 THcd : 실화율 규정치Rmf: misfire rate THcd: misfire rate

본 발명은 크랭크샤프트의 각가속도를 연산하여 규정치 이하인 경우 실화로 판정하는 제1단계와, 1000 회전 이상에서 실화율이 2.2% 이상이면 유해 배기 가스가 규제치의 1.5배를 초과하는 시스템 고장으로 판정하는 제2단계와, 200∼1000 회전시 실화율이 규정치 이상이면 촉매가 손상되는 시스템 고장으로 판정하는 제3단계와, 200 회전 이하에서는 실화 발생에 관계없이 판정을 중지하는 제4단계로 구성된 것을 특징으로 한다.The present invention provides a first step of calculating the angular acceleration of the crankshaft to be a misfire when it is below a prescribed value, and a system failure to determine that harmful exhaust gas exceeds 1.5 times the regulated value when the misfire rate is more than 2.2% at 1000 revolutions or more. 2 steps, and a third step of determining that the system is a failure of the catalyst if the misfire rate at 200 to 1000 rotations is above the prescribed value, and a fourth step of stopping determination regardless of the occurrence of misfire at 200 or less rotations. do.

이하, 본 발명의 실시 예를 첨부된 도면을 참조하여 상세하게 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명의 엔진 실화 제어 방법은 도 2에 도시된 바와 같이 크랭크샤프트의 각가속도(An)를 연산하여 규정치(TH) 이하인 경우 실화(Misfire)로 판정하는 제1단계와, 1000 회전 이상에서 실화율(Rmf)이 2.2% 이상이면 유해 배기 가스가 규제치의 1.5배를 초과하는 시스템 고장으로 판정하는 제2단계와, 200∼1000 회전시 실화율(Rmf)이 규정치(THcd) 이상이면 촉매가 손상되는 시스템 고장으로 판정하는 제3단계와, 200 회전 이하에서는 실화 발생에 관계없이 판정을 중지하는 제4단계로 구성된다.As shown in FIG. 2, the engine misfire control method of the present invention calculates the angular acceleration An of the crankshaft and determines a misfire when it is equal to or less than the prescribed value TH. Rmf) is 2.2% or more, the second step of determining that the harmful exhaust gas is a system failure exceeding 1.5 times the regulated value, and if the burn rate Rmf at 200 to 1000 rotations is above the prescribed value (THcd), the catalyst is damaged. And a third step of determining that there is a failure, and a fourth step of stopping the determination regardless of occurrence of misfire in 200 revolutions or less.

이때, 상기한 각가속도 규정치(TH) 및 실화율 규정치(THcd)는 엔진 회전수(Ne)와 부하(μv)에 의해 결정된다.At this time, the angular acceleration regulation value TH and misfire rate regulation value THcd are determined by the engine speed Ne and the load μv.

상기와 같이 구성된 본 발명의 엔진 실화 제어 방법은 크랭크샤프트의 회전수에 따라 별도의 기준을 이용하여 시스템 고장 여부를 판단하게 된다.In the engine misfire control method of the present invention configured as described above, it is determined whether a system failure is performed by using a separate reference according to the rotation speed of the crankshaft.

먼저, 엔진이 실화 모니터링 상태인지를 확인하여, 실화 모니터링 중이면 크랭크샤프트의 각가속도(An)를 연산한다. 각가속도(An)가 연산되면 각가속도 규정치(TH)와 비교하여 연산된 각가속도(An)가 규정치(TH) 이하이면 실화로 판정하고 그렇지 않으면 정상 상태로 판정한다.First, it is checked whether the engine is a misfire monitoring state, and if the misfire monitoring is performed, the angular acceleration An of the crankshaft is calculated. When the angular acceleration An is calculated, if the calculated angular acceleration An is equal to or less than the prescribed value TH, the misfire is determined as true.

이때, 크랭크샤프트의 회전수가 1000회 이상인지를 확인하고, 1000회 이상이면 실화율(Rmf)을 연산한다. 연산된 실화율(Rmf)이 2.2% 이상이면 유해 배기 가스가 규제치의 1.5배를 초과하는 시스템 고장으로 판정하고, 그렇지 않으면 정상 상태로 판정한다.At this time, it is checked whether the rotation speed of the crankshaft is 1000 times or more, and if it is 1000 times or more, the misfire rate Rmf is calculated. If the calculated misfire rate Rmf is 2.2% or more, it is determined that the noxious exhaust gas is a system failure of more than 1.5 times the regulated value, otherwise it is determined to be in a normal state.

또, 크랭크샤프트의 회전수가 1000회 이하일 경우 200회 이상인지를 확인하여, 200∼1000회 사이이면 실화율(Rmf)을 연산하고, 그렇지 않으면 판정을 종료한다. 실화율(Rmf)이 연산되면 연산된 실화율과 실화율 규정치(THcd)를 비교하여, 규정치(THcd)를 초과하면 촉매에 손상을 일으키는 시스템 고장으로 판정하고 그렇지 않으면 정상 상태로 판정한다.If the number of rotations of the crankshaft is 1000 or less, it is checked whether it is 200 or more, and if it is between 200 and 1000 times, the misfire rate Rmf is calculated, otherwise the determination is finished. When the misfire rate Rmf is calculated, the calculated misfire rate and the misfire rate threshold value THcd are compared, and when the threshold value THcd is exceeded, it is determined as a system failure causing damage to the catalyst, and otherwise it is determined as a normal state.

이와 같이, 본 발명의 엔진 실화 제어 방법은 북미의 OBD-Ⅱ 규정을 만족시킬 뿐 아니라 실화 발생시 실화 발생 요인을 재빨리 확인토록 함으로써 실화로 인한 유해 배기 가스 발생을 최소화할 수 있는 이점이 있다.As described above, the engine misfire control method of the present invention not only satisfies the OBD-II regulations of North America, but also has an advantage of minimizing the generation of harmful exhaust gas due to misfire by promptly identifying the misfire occurrence factor when misfire occurs.

Claims (2)

크랭크샤프트의 각가속도를 연산하여 규정치 이하인 경우 실화로 판정하는 제1단계와, 1000 회전 이상에서 실화율이 2.2% 이상이면 유해 배기 가스가 규제치의 1.5배를 초과하는 시스템 고장으로 판정하는 제2단계와, 200∼1000 회전시 실화율이 규정치 이상이면 촉매가 손상되는 시스템 고장으로 판정하는 제3단계와, 200 회전 이하에서는 실화 발생에 관계없이 판정을 중지하는 제4단계로 구성된 것을 특징으로 하는 엔진 실화 제어 방법.A first step of calculating the angular acceleration of the crankshaft to be a misfire if it is less than the prescribed value, and a second step of determining that the exhaust gas is more than 1.5 times the regulated value if the misfire rate is more than 2.2% at 1000 revolutions or more; Engine failure, comprising: a third step of determining a system failure in which the catalyst is damaged when the fire rate at 200 to 1000 revolutions is equal to or higher than a prescribed value; and a fourth step of stopping determination regardless of occurrence of a burnout at or below 200 revolutions. Control method. 제 1 항에 있어서,The method of claim 1, 상기한 규정치는 엔진 회전수와 부하에 의해 결정되는 것을 특징으로 하는 엔진 실화 제어 방법.Said prescribed value is determined by engine speed and load, The engine misfire control method characterized by the above-mentioned.
KR1019970031918A 1997-07-10 1997-07-10 Method of misfire control KR100251205B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102213233B1 (en) * 2019-11-28 2021-02-08 주식회사 현대케피코 Misfire diagnosis system and method for single cylinder engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100836311B1 (en) * 2006-12-14 2008-06-09 현대자동차주식회사 Misfire detection control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102213233B1 (en) * 2019-11-28 2021-02-08 주식회사 현대케피코 Misfire diagnosis system and method for single cylinder engine

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