KR100211690B1 - Fuel injection control method preventing sudden drop of engine r.p.m. when low temperature - Google Patents
Fuel injection control method preventing sudden drop of engine r.p.m. when low temperature Download PDFInfo
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- KR100211690B1 KR100211690B1 KR1019950053724A KR19950053724A KR100211690B1 KR 100211690 B1 KR100211690 B1 KR 100211690B1 KR 1019950053724 A KR1019950053724 A KR 1019950053724A KR 19950053724 A KR19950053724 A KR 19950053724A KR 100211690 B1 KR100211690 B1 KR 100211690B1
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- engine speed
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- fuel
- control method
- engine
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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
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
- F02D31/007—Electric control of rotation speed controlling fuel supply
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- 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 저온으로 인해 엔진에 부하가 걸려 엔진 회전수가 급격히 저하할 시, 이를 방지키 위해 저하되는 만큼의 연료량을 증가 공급토록 하는 저온 시 엔진 회전수의 급저하 방지를 위한 연료제어 방법에 관한 것으로, 최대 엔진 회전수 저하값을 설정하고, 이 값과 현 엔진 회전수를 비교한 후 엔진 회전수가 저하된 만큼만 연료량을 증가하여 공급토록 하므로써, 쓸데없이 낭비되는 연료량을 효율적으로 제어한다.The present invention relates to a fuel control method for preventing a sudden drop in the engine speed at low temperatures to increase the amount of fuel that is reduced in order to prevent this, when the engine speed is sharply lowered due to the low temperature. By setting the maximum engine speed reduction value and comparing this value with the current engine speed, the amount of fuel is increased and supplied only as much as the engine speed decreases, thereby efficiently controlling the amount of waste fuel that is wasted.
Description
제1도는 본 발명의 연료제어방법을 설명하기 위한 그래프.1 is a graph for explaining a fuel control method of the present invention.
제2도는 본 발명의 연료제어방법 과정을 도시한 순서도이다.2 is a flow chart showing the fuel control method process of the present invention.
본 발명은 저온 시 엔진 회전수의 급저하 방지를 위한 연료제어 방법에 관한 것이다.The present invention relates to a fuel control method for preventing a sudden drop in engine speed at low temperatures.
일반적으로, 겨울철처럼 외기 온도가 매우 낮은 추운 날씨에는 차량에 문제가 많이 발생하는 바, 특히 극저온이 비교적 오래동안 유지되면 트랜스미션 오일의 점도가 매우 높아지게 된다.In general, in cold weather where the outside air temperature is very low, such as winter, a lot of problems occur in the vehicle, especially if the cryogenic temperature is maintained for a relatively long time, the viscosity of the transmission oil becomes very high.
트랜스미션 오일의 점도가 외기 온도에 의해 높이진 상태가 되면 실질적으로 트랜스미션(T/M) 오일이 거의 굳어 있는 상태가 되는 바, 이 상태에서 시동을 걸고, 급출발을 하게 되면 출발 시 클러치 연동에 따라 트랜스미션에 갑작스런 부하가 인가된다.When the viscosity of the transmission oil is raised by the outside temperature, the transmission oil becomes substantially solid.When starting and starting at this state, the transmission is started according to the clutch interlocking. Sudden load is applied.
트랜스미션 오일이 굳어 있는 상태에서, 트랜스미션에 급격한 부하가 인가되면 상기한 트랜스미션 오일로 인해 엔진 회전수(RPM)가 급격히 저하되는 경우를 볼 수 있다.In a state in which the transmission oil is hardened, if a rapid load is applied to the transmission, the engine speed (RPM) may be sharply lowered due to the transmission oil.
즉, 클러치를 통해 트랜스미션에 전달되는 동력이 상기한 트랜스미션 오일의 점도 때문에 트랜스미션을 구동시키기 어렵게 되고, 이로 인해 엔진 회전수가 급격하게 저하됨과 아울러 시동이 꺼지는 경우가 발생되는 것이다.In other words, the power transmitted to the transmission through the clutch is difficult to drive the transmission due to the viscosity of the transmission oil, which causes a sharp decrease in the engine speed and turn off.
상기한 바와 같은 현상은 통상 흡입 공기량의 증대로 대응되지만, 공연비 희박(LEAN PEAK)이 발생되기 때문에 낭비되는 연료량이 증대된다.The above-described phenomenon usually corresponds to an increase in the amount of intake air, but the amount of fuel wasted is increased because an air-fuel ratio lean (LEAN PEAK) is generated.
따라서 본 발명은 상기한 문제점을 해결하기 위한 것으로서, 외기 온도가 극 저온일 때 최대 엔진 회전수 저하값을 설정하고, 현재 엔진 회전수가 상기 설정한 회전수 보다 작으면 더이상 저하되지 않도록 연료를 공급하여 시동이 꺼지게되는 경우를 방지코자 하는데 목적이 있다.Therefore, the present invention is to solve the above problems, by setting the maximum engine speed reduction value when the ambient temperature is extremely low, and supplying the fuel so that the current engine speed is not lowered any more than the set rotation speed The purpose is to prevent the engine from turning off.
이하, 본 발명의 일실시예를 첨부한 도면을 참조하여 상세히 설명하면 다음과 같다.Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
상기에서도 잠시 언급한 바와 같이 극 저온시 엔진 시동을 걸고 즉시 클러치를 접속시켜 트랜스미션에 동력을 전달하게 되면, 부하로 인해 엔진 회전수가 급격히 저하되는 것을 제1도에 도시된 그래프를 보면 알 수 있을 것이다.As mentioned above, if the engine is started at an extremely low temperature and the clutch is immediately connected to transmit power to the transmission, it can be seen from the graph shown in FIG. 1 that the engine speed drops sharply due to the load. .
본 발명에서는 상기 그래프에 도시한 바와 같이 최대 엔진 회전수 저하값을 설정(NeØ)하고, 현재 입력되는 엔진 회전수가 상기 설정값 보다 작으면 연료량 보정을 취하여 엔진 회전수가 저하되는 것을 방지하는 것이다.In the present invention, as shown in the graph, the maximum engine speed decrease value is set (NeØ), and if the engine speed currently input is smaller than the set value, the fuel amount is corrected to prevent the engine speed from being lowered.
즉, 외기 온도가 극 저온일 때 연료량의 기본값에 곱해지는 보정값인, 보정 초기치를 Kcold[i=0] = KØ (KØ는 그래프에 표기된 값임)로 설정하고; 초기 이후 보정값의 계산과 연료량 보정은 하기 식(1)(2)에 따라 계산한다.That is, the initial value of correction, which is a correction value multiplied by the default value of fuel amount when the outside temperature is extremely low, is set to K cold [i = 0] = KØ (KØ is a value indicated in the graph); The calculation of the correction value and the fuel amount correction after the initial stage are calculated according to the following equation (1) (2).
상기한 (1)식중 i는 시간(sec 또는 min)에 따른 순차적인 값으로 예를 들면 (i=1, 2, 3, 4‥‥)가 된다.In said formula (1), i is a sequential value according to time (sec or min), for example, (i = 1, 2, 3, 4 ...).
또한, D 값은 Kcold값으로 나타나는 그래프의 기울기인 바, 상기한 기울기의 값은 설계자가 임의적으로 조정하거나, 차량의 종류 및 트랜스미션 등의 형태에 따라 각각 상이한 값으로 조정되어, 극저온시 차량이 최적의 성능을 나타내게 된다.In addition, the D value is an inclination of the graph represented by a K cold value, and the inclination value is adjusted by the designer arbitrarily or by a different value depending on the type of vehicle and transmission, and the like. Optimum performance will be shown.
물론, 상기한 외기 온도가 극 저온 상태임을 판별하는 것은 기존에 엔진에 설치되어 있는 수온 센서등을 사용하여 엔진의 온도를 체크함과 아울러 엔진의 온도와 대략 동일한 온도를 나타내는 트랜스미션의 온도를 엔진 온도로 추산하여 검출하게 된다.Of course, to determine that the outside air temperature is an extremely low temperature state by using a water temperature sensor installed in the engine, such as checking the temperature of the engine and the temperature of the transmission showing a temperature approximately equal to the engine temperature It is estimated by.
상기한 바와 같은 본 발명의 연료 제어 과정을 제2도에 도시한 순서도를 참조하여 설명하면 아래와 같다.Referring to the fuel control process of the present invention as described above with reference to the flow chart shown in FIG.
출발 등을 위해 엔진 시동을 걸게 되면 ECU등이 수온 센서로 엔진 즉, 트랜스미션의 온도를 체크하게 되는 바, 실질적으로 외기 온도에 의해 낮아진 온도를 검출하게 되고, 상기한 온도가 일정 온도(미리 설정되어 있는 값) 이하로 낮아지면 이를 ECU에 전달하게 된다.When the engine is started for starting, the ECU checks the temperature of the engine, that is, the transmission, with a water temperature sensor, and detects the temperature lowered by the outside air temperature. If it is lower than the value), it is transmitted to the ECU.
ECU에 신호가 전달되면 ECU가 현재의 엔진 회전수(RPM)을 체크하게 되는 바, 이때 엔진 회전수가 저하될 수 있는 최대값 즉, 트랜스미션에 부하가 인가되었을 때 시동이 꺼지지 않는 상태를 유지하는 최대 엔진 회전수 저하값(NeØ)이 설정되고(S1); 이어 현 차량의 엔진 회전수(RPM)를 입력받는다(S2).When the signal is transmitted to the ECU, the ECU checks the current engine speed (RPM), which is the maximum value at which the engine speed can be reduced, that is, the maximum that the engine does not turn off when a load is applied to the transmission. The engine speed reduction value NeØ is set (S1); Next, the engine speed (RPM) of the current vehicle is input (S2).
현재 차량의 엔진 회전수(RPM)을 입력받으면 이 값이 상기 설정한 최대 엔진 회전수 저하값(NeØ) 보다 작은가(NeØ RPM)의 여부를 판단하게(S3) 된다;When receiving the engine speed RPM of the current vehicle, it is determined whether the value is smaller than the set maximum engine speed decrease value NeØ (NeØ RPM) (S3);
현재 엔진 회전수가 NeØ값보다 작으면 상기한 Kcold[i=0] = KØ에 따른 보정 초기값을 기본 연료량에 곱하여 연료량 공급을 증대시킴으로써 엔진 회전수 저하를 방지한다(S4).If the current engine speed is smaller than the NeØ value, the engine speed reduction is prevented by increasing the fuel amount supply by multiplying the correction initial value according to K cold [i = 0] = KØ by the basic fuel amount (S4).
이때, 상기한 보정 초기값은 차량의 상태, 엔진 종류, 트랜스미션 종류 등에 따라 각각 최적값으로 미리 설정되어 있는 상태가 되는 바, 실질적으로 외부 온도에 의해 트랜스미션의 온도가 낮을 때 클러치를 통해 동력이 전달되면서 엔진 회전수가 낮아지면 ECU가 보정 초기치를 연료량에 곱하여 엔진에 공급하도록 하는 것이다.At this time, the initial value of the correction is set to an optimum value in advance according to the state of the vehicle, the engine type, the transmission type, and the like, and the power is transmitted through the clutch when the transmission temperature is low due to the external temperature. If the engine speed decreases, the ECU will multiply the initial calibration value by the amount of fuel to supply the engine.
보정 초기값에 따른 연료량이 엔진에 공급된 후 연속된 연료량 보정은 식(1)(2)을 이용하여 행한다.After the fuel amount according to the correction initial value is supplied to the engine, continuous fuel amount correction is performed using equations (1) and (2).
즉, 미리 설정되어 있는 값인 Kcold값의 기울기 값에 따라 순차적인 연료량 보정을 행하게 되고, 일정 시간 후 상기한 보정 플로우를 종료하여 정상적인 연료 공급량으로 조정된다.That is, sequential fuel amount correction is performed according to the inclination value of the K cold value which is a preset value, and after a predetermined time, the above-described correction flow is terminated to adjust to the normal fuel supply amount.
물론, 상기한 시간은 실험등에 의해 차량 구동 후 트랜스미션이 정상온도로 높아지는 시간으로 정해지게 된다.Of course, the time is set to the time when the transmission is raised to the normal temperature after driving the vehicle by experiment or the like.
이상에서 상세히 설명한 바와 같이 본 발명은 부하로 인한 엔진 회전수 급저하를 방지키 위해, 엔진 회전수가 저하된 만큼만 연료량을 증가하여 공급토록 함으로써, 쓸데없이 낭비되는 연료량을 효율적으로 제어한다.As described in detail above, in order to prevent the engine speed drop due to the load, the present invention increases and supplies the fuel amount only as much as the engine speed decreases, thereby efficiently controlling the amount of unnecessary waste.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950053724A KR100211690B1 (en) | 1995-12-21 | 1995-12-21 | Fuel injection control method preventing sudden drop of engine r.p.m. when low temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950053724A KR100211690B1 (en) | 1995-12-21 | 1995-12-21 | Fuel injection control method preventing sudden drop of engine r.p.m. when low temperature |
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| Publication Number | Publication Date |
|---|---|
| KR970044789A KR970044789A (en) | 1997-07-26 |
| KR100211690B1 true KR100211690B1 (en) | 1999-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019950053724A KR100211690B1 (en) | 1995-12-21 | 1995-12-21 | Fuel injection control method preventing sudden drop of engine r.p.m. when low temperature |
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| Country | Link |
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| KR (1) | KR100211690B1 (en) |
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1995
- 1995-12-21 KR KR1019950053724A patent/KR100211690B1/en not_active IP Right Cessation
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| Publication number | Publication date |
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| KR970044789A (en) | 1997-07-26 |
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