KR100398214B1 - Method for minimizing a difference of fuel/air ratio of each cylinder - Google Patents
Method for minimizing a difference of fuel/air ratio of each cylinder Download PDFInfo
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- KR100398214B1 KR100398214B1 KR10-2000-0084348A KR20000084348A KR100398214B1 KR 100398214 B1 KR100398214 B1 KR 100398214B1 KR 20000084348 A KR20000084348 A KR 20000084348A KR 100398214 B1 KR100398214 B1 KR 100398214B1
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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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
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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
- F02D41/008—Controlling each cylinder individually
- F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
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- 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
본 발명은 다수의 기통(실린더)을 가진 엔진에서 각 실린더의 공연비 편차를 최소화시키기 위한 것으로서, 본 발명에 따른 실린더별 공연비 편차 최소화 방법은 공회전 상태에서 각 실린더로 공급되는 연료를 순차적으로 차단하여 나타나는 엔진 회전수의 감소(drop)를 반복 측정하는 단계; 각 실린더별 엔진 회전수의 감소 평균을 산출하는 단계; 각 실린더 별 엔진 회전수 감소에 대한 데이터를 이용하여 평균값과 평균값에서 벗어난 실린더별 분포를 백분율(%)로 산출하여 각 실린더별 분사 맵에 반영하는 단계; 각 실린더의 분사 맵을 결정하는 단계를 포함하며, 각 실린더의 분사 맵은 다음 식에 의하여 결정된다.The present invention is to minimize the air-fuel ratio deviation of each cylinder in the engine having a plurality of cylinders (cylinders), the method of minimizing the air-fuel ratio deviation for each cylinder according to the present invention appears by sequentially blocking the fuel supplied to each cylinder in the idle state Repeatedly measuring a drop in engine speed; Calculating a reduction average of the engine speed for each cylinder; Calculating the average value and the distribution of cylinders deviating from the average value as a percentage (%) by using data on the engine speed reduction for each cylinder and reflecting the result in the injection map for each cylinder; Determining an injection map of each cylinder, wherein the injection map of each cylinder is determined by the following equation.
분사 맵i=초기 분사 맵+K(엔진 회전수 감소량i-평균 회전수 감소량)Injection map i = initial injection map + K (engine speed reduction i-average speed reduction)
여기서, i는 실린더 번호, K는 보정 계수,Where i is the cylinder number, K is the correction factor,
평균 회전수 감소량=(어느 한 실린더의 반복하여 측정한 회전수Average rotational speed reduction = (repeated rotation of any one cylinder
감소량의 합/실린더 수)Sum / cylinder of reduction)
본 발명은 각 실린더의 조건에 맞는 적절한 양의 연료를 산출하여 그 값을 ECU에 저장함으로서 ECU로 하여금 각 실린더에 적절한 양의 연료를 분사시킨다.The present invention calculates an appropriate amount of fuel for each cylinder condition and stores the value in the ECU so that the ECU injects the appropriate amount of fuel into each cylinder.
Description
본 발명은 실린더별 공연비 편차 최소화 방법에 관한 것이다.The present invention relates to a method for minimizing deviation of air-fuel ratio for each cylinder.
일반적인 차량 엔진에서는 산소 센서를 통하여 공연비 피드백 제어를 실행하고 있으나, 각 기통(실린더) 별로 제어를 하는 것이 아니라 엔진 전체의 평균치에 의한 제어를 실행하고 있다. 따라서 엔진의 하드웨어적인 변화나 구조적인 특성에 의한 각 실린더의 공연비 보정을 이룰 수 없게 된다. 또한, 공기량과 엔진 회전수에 따라 설정되는 기존의 분사 맵(injection map)은 각 실린더에 관계없이 동일한 데이터를 사용하고 있다.In a general vehicle engine, air-fuel ratio feedback control is performed through an oxygen sensor, but control is performed by an average value of the entire engine rather than control by each cylinder (cylinder). Therefore, the air-fuel ratio correction of each cylinder due to the hardware change or structural characteristics of the engine cannot be achieved. In addition, the existing injection map set according to the amount of air and the engine speed uses the same data regardless of each cylinder.
그 한 예를 도 1을 통하여 설명하면 다음과 같다. 도 1은 엔진의 각 실린더와 출력 및 배기 관계를 도시한 개략도로서, 엔진의 6개 실린더(C1 내지 C6)는 배기로(E; exhaust)를 기준으로 전방의 실린더와 후방의 실린더로 구분할 수 있다. 후방의 실린더(C1, C3 및 C5)들은 배기 간섭으로 인하여 전방의 실린더(C2, C4 및 C6)들에 비하여 배압(back pressure)이 높게 되며, 전방의 실린더들(C2, C4 및 C6) 중에서도 중앙의 실린더(C4)는 주 배기로(Em; main stream)와 바로 연결되기 때문에 배압이 가장 낮을 수도 있다.An example thereof will be described with reference to FIG. 1. 1 is a schematic diagram showing the output and exhaust relationship with each cylinder of the engine, wherein the six cylinders C1 to C6 of the engine can be divided into a cylinder in front and a cylinder in the rear based on an exhaust path E; . The rear cylinders C1, C3 and C5 have higher back pressure than the front cylinders C2, C4 and C6 due to exhaust interference, and among the cylinders C2, C4 and C6 in the front, The cylinder C4 may have the lowest back pressure because the cylinder C4 is directly connected to the main exhaust stream (Em).
따라서 전방의 실린더(C2, C4 및 C6), 특히 중앙 실린더(c4)는 가장 낮은 배압으로 인하여 흡입되는 공기량이 가장 많게 되며, 이와 같은 상태에서 모든 실린더(C1 내지 C6)에 동일한 양의 연료가 분사되므로 전방의 중앙 실린더(C4)는 가장 낮은 연비를 나타나게 된다.Therefore, the front cylinders C2, C4 and C6, especially the central cylinder c4, have the highest amount of air sucked due to the lowest back pressure, and in this state, the same amount of fuel is injected into all the cylinders C1 to C6. Therefore, the front center cylinder C4 has the lowest fuel economy.
따라서, 본 발명은 다수의 기통(실린더)을 가진 엔진에서 각 실린더의 공연비 편차를 최소화시키기 위한 것으로서, 생산 라인에서 각 실린더를 순차적으로 연료를 차단(cut off)하여 회전수 변화에 대응한 만큼 연료량을 각 실린더별로 차등적으로 부과하는 실린더별 공연비 편차 최소화 방법을 제공하는데 그 목적이 있다.Accordingly, the present invention is to minimize the variation in the air-fuel ratio of each cylinder in the engine having a plurality of cylinders (cylinders), the amount of fuel by corresponding to the rotational speed change by cutting off each cylinder in the production line sequentially The purpose of the present invention is to provide a method for minimizing the variation in air-fuel ratio by cylinder, which is differentially imposed on each cylinder.
본 발명에 따른 실린더별 공연비 편차 최소화 방법은 공회전 상태에서 각 실린더로 공급되는 연료를 순차적으로 차단하여 나타나는 엔진 회전수의 감소(drop)를 반복 측정하는 단계; 각 실린더별 엔진 회전수의 감소 평균을 산출하는 단계; 각 실린더 별 엔진 회전수 감소에 대한 데이터를 이용하여 평균값과 평균값에서 벗어난 실린더별 분포를 백분율(%)로 산출하여 각 실린더별 분사 맵에 반영하는 단계; 각 실린더의 분사 맵을 결정하는 단계를 포함하며, 각 실린더의 분사 맵은 다음 식에 의하여 결정된다.According to the present invention, there is provided a method of minimizing variation in air-fuel ratio for each cylinder, by repeatedly measuring a drop in engine speed which is indicated by sequentially blocking fuel supplied to each cylinder in an idle state; Calculating a reduction average of the engine speed for each cylinder; Calculating the average value and the distribution of cylinders deviating from the average value as a percentage (%) by using data on the engine speed reduction for each cylinder and reflecting the result in the injection map for each cylinder; Determining an injection map of each cylinder, wherein the injection map of each cylinder is determined by the following equation.
분사 맵i=초기 분사 맵+K(엔진 회전수 감소량i-평균 회전수 감소량)Injection map i = initial injection map + K (engine speed reduction i-average speed reduction)
여기서, i는 실린더 번호,Where i is the cylinder number,
K는 보정 계수,K is the correction factor,
평균 회전수 감소량=(어느 한 실린더의 반복하여 측정한 회전수Average rotational speed reduction = (repeated rotation of any one cylinder
감소량의 합/실린더 수)Sum / cylinder of reduction)
본 발명은 여러 차례의 측정을 통하여 각 실린더의 조건에 맞는 적절한 양의 연료를 산출하여 그 값을 ECU에 저장함으로서 ECU로 하여금 각 실린더에 적절한 양의 연료를 분사시키게 된다.The present invention calculates an appropriate amount of fuel for each cylinder condition through several measurements and stores the value in the ECU so that the ECU injects the appropriate amount of fuel into each cylinder.
도 1은 엔진의 실린더들과 출력 및 배기 관계를 도시한 개략도.1 is a schematic diagram showing the output and exhaust relationship with cylinders of an engine.
도 2는 본 발명에 따른 공연비 최소화 방법을 설명하기 위한 플로우 챠트.2 is a flowchart illustrating a method for minimizing air-fuel ratio according to the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
C1 내지 C2 : 실린더C1 to C2: cylinder
이하, 본 발명을 첨부한 도면을 참고하여 보다 상세히 설명한다.Hereinafter, with reference to the accompanying drawings of the present invention will be described in more detail.
도 2는 본 발명에 따른 공연비 최소화 방법을 설명하기 위한 플로우 챠트로서, 본 발명에서도 공기량과 엔진 회전수에 따라 설정된 분사 맵(injection map)을 각 실린더에 관계없이 동일한 데이터를 사용하나, 여기에 각종 보정 계수를 더하거나 곱함으로서 최종적인 연료 분사량을 결정하게 된다.FIG. 2 is a flow chart for explaining an air-fuel ratio minimizing method according to the present invention. In the present invention, an injection map set according to the amount of air and the engine speed is used regardless of each cylinder, The final fuel injection amount is determined by adding or multiplying the correction factors.
즉, 각 실린더의 분사 맵은 동일한 데이터를 가지는 것으로서, 이는 차량에 장착되는 전자 제어 유니트(이하, ECU라 칭함)는 모든 실린더에 대하여 동일한 데이터를 갖게 되며, 본 발명에서는 차량의 생산 라인에서 ECU가 장착되면 측정 장비를 연결하게 된다. 차량의 공회전 상태(단계 103)에서 이 측정 장비가 각 실린더를 하나의 실린더씩 순차적으로 연료를 차단하며 이때 나타나는 엔진 회전수의 감소(drop)을 측정한다(단계 104-1 내지 104-n).That is, the injection map of each cylinder has the same data, which means that the electronic control unit (hereinafter referred to as ECU) mounted on the vehicle will have the same data for all the cylinders. Once installed, the measuring equipment is connected. In the idle state of the vehicle (step 103), the measuring equipment cuts off each cylinder one cylinder in sequence and measures the drop in engine speed which appears at this time (steps 104-1 to 104-n).
데이터의 신뢰성을 높이기 위하여 이러한 과정을 설정된 회수만큼 반복 실시하여(단계 105) 각 실린더별 엔진 회전수의 감소 평균을 산출한다. 여기서, 공기가 적게 유입되는 실린더는 연료를 차단시키더라도 많은 양의 공기가 유입되는 실린더에 비하여 엔진 회전수 감소가 적게 나타난다.In order to increase the reliability of the data, this process is repeated as many times as the set number of times (step 105) to calculate a reduction average of the engine speed of each cylinder. Here, even if the cylinder is a small amount of air flowing in, the engine speed decreases less than the cylinder in which a large amount of air is introduced even if the fuel is blocked.
각 실린더 별 데이터를 이용하여 평균값과 평균값에서 벗어난 실린더별 분포를 백분율(%)로 산출(단계 106)하여 각 실린더별 분사 맵에 반영한다(단계 107). 즉, 공기가 적게 유입되는 실린더에는 그 연료 분사량을 적게 하며, 반대로 공기가 많이 유입되는 실린더에는 그 연료 분사량을 증가시킨다. 이때 연료 분사량은 엔진 회전수 감소량에 의하여 결정된다.Using the cylinder-specific data, the average value and the distribution for each cylinder deviating from the average value are calculated as a percentage (step 106) and reflected in the injection map for each cylinder (step 107). That is, the fuel injection amount is decreased in the cylinder into which less air is introduced, and the fuel injection amount is increased in the cylinder into which much air is introduced. At this time, the fuel injection amount is determined by the engine speed reduction amount.
본 발명에서, 각 실린더의 분사맵은 다음과 같은 식에 의하여 결정된다.In the present invention, the injection map of each cylinder is determined by the following equation.
분사 맵i=초기 분사 맵+K(엔진 회전수 감소량i-평균 회전수 감소량)Injection map i = initial injection map + K (engine speed reduction i-average speed reduction)
여기서, i는 실린더 번호,Where i is the cylinder number,
K는 보정 계수,K is the correction factor,
평균 회전수 감소량=(어느 한 실린더의 반복하여 측정한 회전수Average rotational speed reduction = (repeated rotation of any one cylinder
감소량의 합/실린더 수)Sum / cylinder of reduction)
이와 같이 산출된 각 실린더의 분사 맵은 ECU에 저장되며(단계 107), 이후 각 실린더에는 ECU에 기억된 분사 맵에 따라 적절한 양의 연료 분사가 이루어진다.The injection map of each cylinder thus calculated is stored in the ECU (step 107), and then each cylinder is injected with an appropriate amount of fuel in accordance with the injection map stored in the ECU.
이상과 같은 본 발명은 여러 차례의 측정을 통하여 각 실린더의 조건에 맞는 적절한 양의 연료를 산출하여 그 값을 ECU에 저장함으로서 ECU로 하여금 각 실린더에 적절한 양의 연료를 분사시키게 함으로서 모든 실린더의 공연비 편차를 최소화시킬 뿐만 아니라 연비 향상 및 배출가스량을 최소화시킬 수 있는 효과를 얻을 수 있다.As described above, the present invention calculates an appropriate amount of fuel for each cylinder condition through several measurements and stores the value in the ECU, thereby causing the ECU to inject the appropriate amount of fuel into each cylinder, thereby reducing the air-fuel ratio of all cylinders. In addition to minimizing the deviation, it is possible to obtain the effect of improving fuel efficiency and minimizing the amount of exhaust gas.
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5982534A (en) * | 1982-10-29 | 1984-05-12 | Nippon Denso Co Ltd | Control of fuel injection amount for internal-combustion engine |
KR980009822A (en) * | 1996-07-20 | 1998-04-30 | 박병재 | How to control air-fuel ratio |
KR19980053213A (en) * | 1996-12-26 | 1998-09-25 | 박병재 | Injection quantity correction method by cylinder-by-cylinder learning |
KR20020022355A (en) * | 2000-09-20 | 2002-03-27 | 이계안 | System for compensating air fuel ratio deviation of each cylinder for engine and method for the same |
-
2000
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5982534A (en) * | 1982-10-29 | 1984-05-12 | Nippon Denso Co Ltd | Control of fuel injection amount for internal-combustion engine |
KR980009822A (en) * | 1996-07-20 | 1998-04-30 | 박병재 | How to control air-fuel ratio |
KR19980053213A (en) * | 1996-12-26 | 1998-09-25 | 박병재 | Injection quantity correction method by cylinder-by-cylinder learning |
KR20020022355A (en) * | 2000-09-20 | 2002-03-27 | 이계안 | System for compensating air fuel ratio deviation of each cylinder for engine and method for the same |
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