KR100375769B1 - Fuel quantity correction method when low temperature start - Google Patents
Fuel quantity correction method when low temperature start Download PDFInfo
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- KR100375769B1 KR100375769B1 KR10-2000-0081020A KR20000081020A KR100375769B1 KR 100375769 B1 KR100375769 B1 KR 100375769B1 KR 20000081020 A KR20000081020 A KR 20000081020A KR 100375769 B1 KR100375769 B1 KR 100375769B1
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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
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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
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
- F02D2009/0201—Arrangements; Control features; Details thereof
- F02D2009/0223—Cooling water temperature
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
본 발명은 저온 출발시 연료량 보정방법에 관한 것으로서,The present invention relates to a fuel amount correction method at low temperature start,
종래의 연료량 보정방법에서는 엔진회전수 및 냉각수의 온도에 따라 보정되는 연료 공급량이 그때의 엔진회전수에서 최대로 공급가능하게 설정된 연료공급량을 넘어서지 못하도록 설정되어있으므로 엔진 냉각수의 온도가 초저온, 즉, 약 40℃ 이하의 상태에서 차량이 출발하려고 할때에도 최대로 공급가능하게 설정된 연료 공급량 이내에서 연료가 엔진에 공급됨에 따라 저온상태에서의 차량 및 엔진의 마찰력에 의해 차량의 출발성이 현저히 떨어지는 문제점이 있었고, 심할경우에는 엔진의 rpm이 급속히 감소하면서 시동이 꺼지는 현상까지 발생하였다.In the conventional fuel amount correction method, since the fuel supply amount corrected according to the engine speed and the coolant temperature is set so as not to exceed the fuel supply amount set to be maximally supplied at the engine speed at that time, the temperature of the engine coolant is extremely low, that is, about As the fuel is supplied to the engine within the fuel supply amount set to be able to supply the maximum even when the vehicle is about to start at 40 ° C or below, there is a problem that the starting ability of the vehicle is significantly decreased due to the frictional force of the vehicle and the engine at low temperature. In some cases, the engine's rpm decreased rapidly, causing the engine to shut down.
따라서, 상기 문제점을 해결하기 위한 본 발명은 일정온도 이하의 저온에서 차량이 출발할때 기존에 설정되어있는 연료량에 냉각수온도와 엔진회전수에 따라 새로 연산되는 보정치를 합하여 보다 많은 양의 연료가 엔진에 공급되도록 하므로서, 저온 출발시 엔진의 연소력을 향상시켜 출력이 대폭 향상되도록 하여 차량의 출발이 용이해지도록 함은 물론 rpm저하로 인한 엔진 꺼짐 현상을 미연에 방지할 수 있도록 한 저온 출발시 연료량 보정방법에 관한 것이다.Accordingly, the present invention for solving the above problems is that when the vehicle starts at a low temperature below a certain temperature, a larger amount of fuel is added by adding a correction value newly calculated according to the coolant temperature and the engine speed when the vehicle starts. By supplying to the engine, it is possible to improve the combustion power of the engine when starting at low temperature, so that the output is greatly improved, making it easier to start the vehicle, and to prevent the engine off due to the rpm decrease. It relates to a correction method.
Description
본 발명은 저온 출발시 연료량 보정방법에 관한 것으로서, 특히 일정온도 이하의 저온에서 차량이 출발할때 기존에 설정되어있는 연료량에 냉각수온도와 엔진회전수에 따라 새로 연산되는 보정치를 합하여 보다 많은 양의 연료가 엔진에 공급되도록 하므로서, 저온 출발시 엔진의 연소력을 향상시켜 출력이 대폭 향상되도록 하여 차량의 출발이 용이해지도록 함은 물론 rpm저하로 인한 엔진 꺼짐 현상을 미연에 방지할 수 있도록 한 저온 출발시 연료량 보정방법에 관한 것이다.The present invention relates to a method for compensating fuel amount at low temperature start, in particular, when a vehicle starts at a low temperature below a certain temperature, a larger amount of fuel is set by adding a newly calculated correction value according to the coolant temperature and engine speed. By supplying fuel to the engine, it improves the combustion power of the engine when starting at low temperature, so that the output is greatly improved, which makes it easier to start the vehicle, and also prevents engine shutdown due to rpm reduction. It relates to a fuel amount correction method at the start.
엔진은 일정양의 연료와 공기를 혼합하여 연소시켜 동력을 발생시키는 것으로, 엔진 냉각수온도, 엔진rpm, 대기압력 등과같은 요인에 따라 엔진으로 공급되는연료량을 적절히 조절하여 엔진이 최적의 상태로 연소되도록 제어하는 연료량 보정방법이 제공되고 있다.The engine generates power by mixing and mixing a certain amount of fuel and air, and adjusts the amount of fuel supplied to the engine according to factors such as engine coolant temperature, engine rpm, and atmospheric pressure so that the engine is combusted optimally. A fuel amount correction method for controlling is provided.
도 1 은 종래의 연료량 보정방법을 도시한 플로우챠트로서,1 is a flow chart showing a conventional fuel amount correction method,
엔진이 구동하고, 엑셀이 개도되면 차량에 탑재된 ECU(미도시되었음)는 엔진의 rpm과 냉각수온도와 대기압력을 판단하고, 판단된 현재의 상태에 따라 엔진으로 공급할 연료량을 설정한다.When the engine is driven and Excel is opened, the ECU (not shown) mounted on the vehicle determines the rpm, coolant temperature, and atmospheric pressure of the engine, and sets the amount of fuel to be supplied to the engine according to the determined current state.
일반적으로 엔진 회전수가 낮으면 작은양의 연료가 공급되도록하고, 회전수가 높으면 많은 양의 연료가 공급되도록 하며, 또 냉각수의 온도가 낮으면 적은양의 연료가 공급되도록 하고, 냉각수 온도가 높으면 많은 양의 연료가 공급되도록 한다.Generally, a small amount of fuel is supplied when the engine speed is low, a large amount of fuel is supplied when the engine speed is high, and a small amount of fuel is supplied when the temperature of the coolant is low, and a large amount is supplied when the coolant temperature is high. To supply fuel.
하지만, 종래의 연료량 보정방법에서는 엔진회전수 및 냉각수의 온도에 따라 보정되는 연료 공급량이 그때의 엔진회전수에서 최대로 공급가능하게 설정된 연료공급량을 넘어서지 못하도록 설정되어있으므로 엔진 냉각수의 온도가 초저온, 즉, 약 40℃ 이하의 상태에서 차량이 출발하려고 할때에도 최대로 공급가능하게 설정된 연료 공급량 이내에서 연료가 엔진에 공급됨에 따라 저온상태에서의 차량 및 엔진의 마찰력에 의해 차량의 출발성이 현저히 떨어지는 문제점이 있었고, 심할경우에는 엔진의 rpm이 급속히 감소하면서 시동이 꺼지는 현상까지 발생하였다.However, in the conventional fuel amount correction method, since the fuel supply amount corrected according to the engine speed and the coolant temperature is set so as not to exceed the fuel supply amount set to be maximally supplied at the engine speed at that time, the temperature of the engine coolant is extremely low, that is, When the vehicle is about to start at about 40 ℃ or less, fuel is supplied to the engine within the maximum fuel supply that is set to be able to be supplied. In severe cases, the engine's rpm decreased rapidly, causing the engine to turn off.
따라서, 상기 문제점을 해결하기 위한 본 발명은 일정온도 이하의 저온에서 차량이 출발할때 기존에 설정되어있는 연료량에 냉각수온도와 엔진회전수에 따라새로 연산되는 보정치를 합하여 보다 많은 양의 연료가 엔진에 공급되도록 하므로서, 저온 출발시 엔진의 연소력을 향상시켜 출력이 대폭 향상되도록 하여 차량의 출발이 용이해지도록 함은 물론 rpm저하로 인한 엔진 꺼짐 현상을 미연에 방지할 수 있도록 한 저온 출발시 연료량 보정방법을 제공함을 목적으로 한다.Accordingly, the present invention for solving the above problems is that when the vehicle starts at a low temperature below a certain temperature, a larger amount of fuel is added to the amount of fuel previously set by adding a correction value newly calculated according to the coolant temperature and the engine speed. By supplying to the engine, it is possible to improve the combustion power of the engine when starting at low temperature, so that the output is greatly improved, making it easier to start the vehicle, and to prevent the engine off due to the rpm decrease. It aims to provide a correction method.
상기 목적달성을 위한 본 발명은,The present invention for achieving the above object,
엔진이 구동하고, 엑셀이 개도되면 엔진회전수, 냉각수온, 대기압력에 따라 연료량을 설정하는 단계와, 상기 단계이후 냉각수온이 설정온도에 도달하는지를 판단하고 그 결과에 따라 연료량을 보정하는 단계를 포함하는 연료량 보정방법에 있어서,When the engine is driven and the Excel is opened, the step of setting the fuel amount according to the engine speed, the cooling water temperature and the atmospheric pressure, and determining whether the cooling water temperature reaches the set temperature after the step and correcting the fuel amount according to the result In the fuel amount correction method comprising,
냉각수온이 40℃ 이하인지를 판단하는 제 1 단계와;A first step of determining whether the cooling water temperature is 40 ° C. or less;
제 1 단계의 판단결과 냉각수온이 40℃ 이하이면 냉각수온에 따른 연료량 설정맵에 따라 제 1 보정치(Q1)를 연산하는 제 2 단계와;A second step of calculating a first correction value Q1 according to the fuel amount setting map according to the cooling water temperature if the cooling water temperature is 40 ° C. or less as a result of the determination in the first step;
제 2 단계에서 엔진회전수를 검출하고, 검출된 회전수와 "회전수에 따른 연료량 설정맵"에 따라 연료량 제 2 보정치(Q2)를 연산하는 제 3 단계와;A third step of detecting the engine speed in the second step and calculating a fuel amount second correction value Q2 according to the detected speed and the "fuel amount setting map according to the rotation speed";
상기 제 1 보정치(Q1)와 제 2 보정치(Q2)를 곱하여 최종보정값을 연산한 후 상기 얻어진 최종보정값을 현재 rpm에 대응하는 최대 연료량(Q3)에 더하여 목표 연료분사량을 확정하는 제 4 단계; 를 더 포함하여 진행되는 것을 특징으로 한다.A fourth step of determining a target fuel injection amount by multiplying the first correction value Q1 and the second correction value Q2 to calculate a final correction value, and then adding the obtained final correction value to the maximum fuel amount Q3 corresponding to the current rpm; ; It characterized in that the further including.
도 1 은 종래의 연료량 보정방법을 보인 플로우챠트.1 is a flow chart showing a conventional fuel amount correction method.
도 2 는 본 발명의 저온출발시 연료량 보정방법을 보인 플로우챠트.Figure 2 is a flow chart showing a fuel amount correction method when starting at low temperature of the present invention.
도 3 은 본 발명에 적용되는 연료량 추가보정방법을 설명하기위한 도면.3 is a view for explaining a fuel amount additional correction method applied to the present invention.
도 4 의 (가)(나)는 종래와 본 발명에 의한 연료공급량을 보인 그래프.Figure 4 (a) (b) is a graph showing the fuel supply amount according to the prior art and the present invention.
이하, 첨부된 도면 도 2 내지 도 4 를 참조하여 본 발명의 바람직한 실시예를 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, FIGS. 2 to 4.
먼저, 본 발명에서는 냉각수온도가 40℃ 이하일때 적용할 "냉각수온에 따른 연료량 설정맵"과 "회전수에따른 연료량설정맵"을 준비한다.First, the present invention prepares the "fuel amount setting map according to the cooling water temperature" and the "fuel amount setting map according to the rotation speed" to be applied when the coolant temperature is 40 ° C or less.
상기 냉각수온에따른 연료량 설정맵은 도 3 의 그래프에 도시된 바와같이 냉각수온도가 40℃ 이하일때 적용되는 연료량 반영치가 설정되어 있다.In the fuel amount setting map according to the cooling water temperature, as shown in the graph of FIG. 3, a fuel amount reflecting value applied when the cooling water temperature is 40 ° C. or lower is set.
또한 상기 회전수에따른 연료량 설정맵은 도 3 의 그래프에 도시된 바와같이 엔진 회전수가 2000rpm에 도달할때까지의 연료량 반영치가 설정되어 있다.In addition, as shown in the graph of FIG. 3, the fuel amount setting map according to the rotational speed has a fuel amount reflected value until the engine rotational speed reaches 2000 rpm.
상기 냉각수온에따른 연료량설정맵과 엔진회전수에따른 연료량 설정맵은 ECU가 엔진으로 공급되는 연료량을 산출할때 사용되며, 그 사용시기는 냉각수의 온도가 40℃ 이하일때 이다.The fuel amount setting map according to the coolant temperature and the fuel amount setting map according to the engine speed are used when the ECU calculates the amount of fuel supplied to the engine, and the use time is when the temperature of the coolant is 40 ° C or lower.
본 발명의 동작을 설명하면 다음과 같다.The operation of the present invention will be described as follows.
엔진이 구동하고, 엑셀이 개도되면 차량에 탑재된 ECU(미도시되었음)는 엔진의 rpm과 냉각수온도와 대기압력을 판단하고, 판단된 현재의 상태에 따라 엔진으로 공급할 연료량을 설정한다.When the engine is driven and Excel is opened, the ECU (not shown) mounted on the vehicle determines the rpm, coolant temperature, and atmospheric pressure of the engine, and sets the amount of fuel to be supplied to the engine according to the determined current state.
상기 단계 이후 ECU는 현재의 냉각수온도를 판단한다.After this step, the ECU determines the current coolant temperature.
상기 판단결과 현재 냉각수온도가 40℃ 이하이면 ECU는 미리 준비된 냉각수온에따른 연료량설정맵과 엔진회전수에따른 연료량설정맵을 이용하여 연료량 추가보정단계를 수행한다.As a result of the determination, if the current coolant temperature is 40 ° C. or lower, the ECU performs an additional fuel level correction step using a fuel amount setting map according to the coolant temperature prepared in advance and a fuel amount setting map according to the engine speed.
즉, ECU는 냉각수온이 40℃ 이하이면 상기 준비된 냉각수온에따른 연료량 설정맵에 따라 제 1 보정치(Q1)를 연산하고, 이후 ECU는 현재의 엔진 rpm을 검출하고, 검출된 rpm과 상기 준비된 회전수에따른 연료량 설정맵에 따라 제 2보정치(Q2)를 연산한다.That is, when the coolant temperature is 40 ° C. or lower, the ECU calculates the first correction value Q1 according to the fuel amount setting map according to the prepared coolant temperature, and then the ECU detects the current engine rpm, and detects the detected rpm and the prepared rotation. The second correction value Q2 is calculated according to the fuel amount setting map according to the number.
그리고, 상기 얻어진 제 1 보정치(Q1)와 제 2 보정치(Q2)를 곱하여 최종 보정치를 연산한 후 현재의 rpm에 엔진에 공급가능한 최대의 연료량에 상기 얻어진 최종 보정치를 합하여 엔진에 공급할 목표 연료분사량을 확정하게 된다.After calculating the final correction value by multiplying the obtained first correction value Q1 and the second correction value Q2, the target fuel injection amount to be supplied to the engine by adding the final correction value to the maximum amount of fuel that can be supplied to the engine at the current rpm. Will be confirmed.
상기 최종적으로 연산된 목표 연료분사량은 현재의 엔진 rpm 하에서 기존에 설정되어 있는 최대 연료량보다 상기 얻어진 최종 보정치만큼 더 증가한 양이 되므로 엔진의 출력이 높아지게되는 것이다.The final calculated target fuel injection amount is increased by the final correction value obtained above the maximum fuel amount previously set under the current engine rpm, so that the output of the engine is increased.
상기 확정된 연료분사량에 따라 엔진에 연료가 분사되도록 함에 따라 엔진으로는 많은 양의 연료가 공급되어 연소효율이 매우 높아지게되어 최대출력을 얻게되고, 이에의해 저온상태에서 차량 및 엔진의 마찰력이 높아진상태이더라도 이를 극복하고 차량이 정상적으로 출발하게되는 것이다.As the fuel is injected into the engine according to the determined fuel injection amount, a large amount of fuel is supplied to the engine, so that the combustion efficiency is very high, thereby obtaining the maximum output, whereby the frictional force between the vehicle and the engine is increased at low temperatures. Even if this is overcome, the vehicle will start normally.
그리고, 상기 제어과정중에 냉각수의 온도가 40℃를 넘어서게되면 이전의 연료 보정방법에 의존하여 엔진으로 공급되는 연료량을 결정한다.When the temperature of the coolant exceeds 40 ° C. during the control process, the amount of fuel supplied to the engine is determined depending on the previous fuel correction method.
도 4 의 (가)와 (나)는 종래와 본 발명에 의해 엔진으로 공급되는 연료량을 그래프로 나타낸 것이다.4A and 4B are graphs showing the amount of fuel supplied to the engine according to the related art and the present invention.
종래의 기술에 의하면, 도 4 의 (가)와같이 냉각수온도가 40℃이하인 상태에서 차량이 출발하려할 때에도 엔진으로 공급되는 연료량이 엔진 rpm 증가에 비례하여 점진적으로 증가되고 있음을 알 수 있는데 반해,According to the related art, as shown in (a) of FIG. 4, even when the vehicle is about to start at a coolant temperature of 40 ° C. or lower, the amount of fuel supplied to the engine increases gradually in proportion to the increase of the engine rpm. ,
본 발명에 의하면, 도 4 의 (나)와같이 냉각수온도가 40℃이하에서 차량이 출발하려할때에는 기존에 설정된 연료량에 보정치가 추가되어 엔진으로 공급되는연료량이 급격히 증가하고 있음을 알 수 있다.According to the present invention, as shown in (b) of FIG. 4, when the vehicle is about to start at 40 ° C. or lower, a correction value is added to the existing fuel amount and the amount of fuel supplied to the engine is rapidly increased.
상기 설명과같은 본 발명의 연료량 보정방법에 의하면, 냉각수 온도가 40℃ 이하인 저온상태에서 차량이 출발하려고할때 엔진으로 공급되는 연료의 양이 급격히 증가하면서 차량의 출발성이 향상되는 효과를 기대할 수 있는 것이다.According to the fuel amount correction method of the present invention as described above, when the vehicle is about to start in a low temperature state of the coolant temperature is 40 ℃ or less, the amount of fuel supplied to the engine is rapidly increased and the startability of the vehicle can be expected to be improved. It is.
이상에서 설명한 바와같이 본 발명은 일정온도 이하의 저온에서 차량이 출발할때 기존에 설정되어있는 연료량에 냉각수온도와 엔진회전수에 따라 새로 연산되는 보정치를 합하여 보다 많은 양의 연료가 엔진에 공급되도록 하므로서, 저온 출발시 엔진의 연소력을 향상시켜 출력이 대폭 향상되도록 하여 차량의 출발이 용이해지도록 함은 물론 rpm저하로 인한 엔진 꺼짐 현상을 미연에 방지할 수 있도록 한 저온 출발시 연료량 보정방법을 제공하는 효과를 기대할 수 있다.As described above, when the vehicle starts at a low temperature below a certain temperature, the present invention adds a predetermined amount of fuel to the engine to supply a larger amount of fuel by adding a correction value newly calculated according to the coolant temperature and the engine speed. Therefore, it is possible to improve the combustion power of the engine at low temperature so that the output is greatly improved, thereby making it easier to start the vehicle and to prevent the engine off due to the rpm decrease. You can expect the effect to provide.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01271641A (en) * | 1988-04-20 | 1989-10-30 | Mazda Motor Corp | Device for controlling fuel of engine |
| JPH0693904A (en) * | 1992-09-09 | 1994-04-05 | Mikuni Corp | Electronically controlled fuel injection device |
| JPH0914013A (en) * | 1995-06-28 | 1997-01-14 | Daihatsu Motor Co Ltd | Internal combustion engine air-fuel ratio controlling method |
| JPH1077879A (en) * | 1996-08-30 | 1998-03-24 | Suzuki Motor Corp | Start-up time control device for internal combustion engine |
| KR19990020446A (en) * | 1997-08-30 | 1999-03-25 | 정몽규 | Fuel injection volume control |
-
2000
- 2000-12-23 KR KR10-2000-0081020A patent/KR100375769B1/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01271641A (en) * | 1988-04-20 | 1989-10-30 | Mazda Motor Corp | Device for controlling fuel of engine |
| JPH0693904A (en) * | 1992-09-09 | 1994-04-05 | Mikuni Corp | Electronically controlled fuel injection device |
| JPH0914013A (en) * | 1995-06-28 | 1997-01-14 | Daihatsu Motor Co Ltd | Internal combustion engine air-fuel ratio controlling method |
| JPH1077879A (en) * | 1996-08-30 | 1998-03-24 | Suzuki Motor Corp | Start-up time control device for internal combustion engine |
| KR19990020446A (en) * | 1997-08-30 | 1999-03-25 | 정몽규 | Fuel injection volume control |
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| KR20020051617A (en) | 2002-06-29 |
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