KR20010037491A - Improved method for starting performance of vehicle - Google Patents

Improved method for starting performance of vehicle Download PDF

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Publication number
KR20010037491A
KR20010037491A KR1019990045056A KR19990045056A KR20010037491A KR 20010037491 A KR20010037491 A KR 20010037491A KR 1019990045056 A KR1019990045056 A KR 1019990045056A KR 19990045056 A KR19990045056 A KR 19990045056A KR 20010037491 A KR20010037491 A KR 20010037491A
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South Korea
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fuel
amount
determining whether
vehicle
engine
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KR1019990045056A
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Korean (ko)
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이해욱
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이계안
현대자동차 주식회사
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Priority to KR1019990045056A priority Critical patent/KR20010037491A/en
Publication of KR20010037491A publication Critical patent/KR20010037491A/en

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
    • F02D2200/602—Pedal position
    • 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
    • F02D41/16—Introducing closed-loop corrections for idling
    • 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

Abstract

PURPOSE: A starting performance improving method for a vehicle is provided to properly compensate a fuel amount with relation to a supercharge pressure at a desired time point, thereby improving the starting performance at a low speed. CONSTITUTION: A starting performance improving method for a vehicle includes the steps of determining whether an engine is in an idle state by measuring a current engine rpm and supercharge air pressure, determining whether a vehicle is started by detecting an opening degree of an acceleration pedal, repeating a normal fuel mapping or the above steps after checking whether the engine rpm is decreased by clutch engagement, determining whether a fuel amount is proper for an engine load state when the engine rpm is normal, compensating a lack fuel amount if a fuel amount is not sufficient, and determining whether the normal fuel mapping is carried out as a fuel supply amount is properly compensated for a supercharge compensating unit to reach an initial pressure.

Description

차량의 출발성능 향상방법{Improved method for starting performance of vehicle}Improved method for starting performance of vehicle}

본 발명은 차량의 출발성능 향상방법에 관한 것으로, 더욱 상세하게는 차량을 출발시키고자 하여 엔진회전수를 높였을 때 과급압이 충분하게 상승하지 못한 상태에서 연료량을 보상할 수 있게 함으로써, 저속에서의 출발성능을 높일 수 있게 한 차량의 출발성능 향상방법에 관한 것이다.The present invention relates to a method of improving the starting performance of a vehicle, and more particularly, to compensate the amount of fuel in a state in which the supercharge pressure does not sufficiently increase when the engine speed is increased to start the vehicle, It relates to a method of improving the starting performance of a vehicle that can increase the starting performance of the vehicle.

일반적으로 T/C 또는 TCI를 적용하고 있는 디젤엔진의 경우 T/C에서 발생된 부스터 압력(과급공기압)에 따라 적정 속도를 유지시켜 주도록 연료량을 공급시켜 주게 된다.In general, a diesel engine using T / C or TCI supplies fuel to maintain an appropriate speed according to booster pressure (charged air pressure) generated from T / C.

이러한 디젤엔진은 기계식과 전자식 인젝션 펌프를 사용하고 있는 엔진 모두에 적용되고 있으며, 특히 전자식 인젝션 펌프를 사용하는 디젤엔진의 경우에는 다음과 같은 도표에서 보는 바와 같이 과급공기압에 따라 연료량을 가감시켜주게 된다.These diesel engines are applied to both engines using mechanical and electronic injection pumps. Especially in the case of diesel engines using electronic injection pumps, the amount of fuel is added or subtracted according to the charge air pressure as shown in the following chart. .

이때, 연료공급량은 엔진회전수가 일정 범위내에서는 일정하지만 과급공기압이 변화에 따라 달라지게 되는데, 과급공기압이 커지게 되면 연료공급량은 많아지게 되고, 반대로 과급공기압이 낮으면 연료공급량은 적어지게 된다.At this time, the fuel supply amount is constant within a certain range of the engine speed, but depending on the change in the boost air pressure, if the boost air pressure is increased, the fuel supply amount is increased, on the contrary, if the boost air pressure is low, the fuel supply amount is reduced.

그러나, T/C와 TCI가 적용된 디젤엔진에서 이와 같은 방법으로 연료공급량을 증가시키는 경우 차량을 출발시키기 위해 가속패달을 밞아 엔진회전수를 증가시키면서 클러치 패달을 서서히 떼게 되면 연료량의 증가로 엔진회전수가 증가하여야 하나, 클러치가 인게이지되고 이 시점에서의 과급압이 연료량을 보상하기 위한 과급공기압 상태에 미치지 못하게 되는 터보레그(turbo lag)가 발생하게 되고, 이에 따라 차량이 저속에서는 출발성능이 떨어지게 되는 문제가 발생하게 되어 이에 대한 개선이 필요하게 되었다.However, in the case of increasing the fuel supply in this way in diesel engines with T / C and TCI, if the clutch pedal is gradually released while increasing the engine speed by accelerating the accelerator pedal to start the vehicle, the engine speed is increased by increasing the fuel amount. It should increase, but a turbo lag occurs where the clutch is engaged and the boost pressure at this point does not reach the state of the boost air pressure to compensate for the fuel volume, resulting in the vehicle deteriorating at low speed. Problems have arisen and improvements are needed.

본 발명은 이러한 점을 감안하여 안출한 것으로, 현재의 엔진회전수와 과급공기압을 측정하여 엔진이 아이들 상태에 있는가를 판단하는 과정과; 가속패달가 개구된 정도를 검출하여 차량이 출발여부를 판단하는 과정과; 클러치 인게이지로 엔진회전수가 떨어졌는지를 확인하여 정상연료맵핑을 수행하거나 상기 과정을 반복하는 과정과; 엔진회전수가 정상인 상태에서 엔진 부하 상태에 따라 적정 연료량인지를 판단하는 과정과; 이 과정에서 연료량이 부족하면 일정량의 연료를 반복하여 적정 연료량만큼 반복하여 보상받는 과정과; 연료공급량이 적정량만큼 보상받아 과급보상장치의 개시 압력에 도달하여 정상 연료 맵핑이 이루어지는가를 판단하는 과정으로 이루어진 것을 특징으로 하는 것이다.The present invention has been made in view of this point, the process of determining whether the engine is in the idle state by measuring the current engine speed and the boost air pressure; Determining whether the vehicle starts by detecting the degree of opening of the accelerator pedal; Checking whether the engine speed drops with the clutch engagement to perform normal fuel mapping or to repeat the above process; Determining whether the amount of fuel is appropriate according to the engine load state in a state where the engine speed is normal; If the amount of fuel is insufficient in this process, repeating a predetermined amount of fuel and repeatedly compensating for the appropriate amount of fuel; The fuel supply amount is compensated by an appropriate amount, characterized in that it consists of a process of determining whether the normal fuel mapping is achieved by reaching the starting pressure of the supercharge compensation device.

도 1은 본 발명에 따른 출발성능을 향상시키기 위한 방법을 나타내는 플로우 챠트,1 is a flow chart showing a method for improving starting performance according to the present invention;

도 2는 본 발명에 따라 엔진회전수에 대한 연료량의 변화를 나타내는 그래프,2 is a graph showing a change in fuel amount with respect to engine speed in accordance with the present invention;

도 3은 본 발명에 따라 엔진회전수에 대한 과급공기압의 변화를 나타내는 그래프.Figure 3 is a graph showing the change in the boost air pressure for the engine speed in accordance with the present invention.

이를 첨부도면을 참조하여 보다 상세하게 설명하면 다음과 같다.This will be described in more detail with reference to the accompanying drawings.

첨부도면 도 1은 본 발명에 따른 출발성능을 향상시키기 위한 방법을 나타내는 플로우 챠트이다.1 is a flowchart showing a method for improving starting performance according to the present invention.

본 발명은 과급기가 구비된 디젤엔진이 장착된 차량을 출발시킬 때에 클러치가 인게이지되는 순간을 파악하고, 이때 연료를 보상해줄 만큼 과급공기압이 올라가 있지 않더라도 공급연료량을 증가시켜서 출발성능을 향상시킬 수 있게 한 것이다.The present invention can grasp the moment when the clutch is engaged when starting a vehicle equipped with a diesel engine equipped with a turbocharger, and at this time, even if the boost air pressure is not raised enough to compensate for fuel, the starting fuel can be increased to improve starting performance. It was made.

이를 위하여, 먼저 엔진회전수 Prmp가 적정범위인 650 ∼ 850 rpm에 있는지를 확인하고, 적정범위에 있으면 이때의 과급공기압 Bp가 760 ∼ 860mmHg 범위에 드는지를 확인하여 엔진이 아이들 상태임을 확인하게 된다.To do this, first check whether the engine speed P rmp is in the proper range of 650 to 850 rpm, and if it is in the proper range, check whether the boost air pressure B p is within the range of 760 to 860 mmHg to confirm that the engine is in the idle state. do.

이때, 과급공기압 Bp가 현재의 엔진회전수에 맞는 압력이면 가속패달이 밞혀져서 얼마정도 개구되었는지를 확인하게 되고, 엔진회전수에 부적절한 압력이면 상술한 전 단계를 계속확인하게 된다.At this time, if the boost air pressure B p is a pressure corresponding to the current engine speed, it is checked how much the accelerator pedal is opened and opened. If the pressure is inappropriate for the engine speed, the above-described previous step is continuously checked.

이어, 아이들 상태임을 확인한 다음 가속패달에 의한 개도 정도가 20%를 넘었는지를 확인하게 되며, 이렇게 개도 정도를 확인하는 것으로 차량의 출발연부를 판단하게 된다.Subsequently, after confirming that the idle state, the degree of opening due to the acceleration pedal is over 20%, and the opening degree of the vehicle is determined by checking the degree of opening.

만약, 가속패달의 개도가 기준치 20%를 넘지 않게 되면 엔진이 아이들상태인지 그리고 현재의 과급공기압은 적절한가를 계속 확인하게 되고, 가속패달의 개도가 기준치 20%를 넘게 되면 클러치 조작에 의하여 엔진회전수 감소현상(RPM drop 현상)이 일어나고 있는지를 판단하여 정상적으로 연료펌프를 구동시키거나 또는 부족한 만큼의 연료를 보상해 주게 된다.If the opening of the accelerator pedal does not exceed the standard value of 20%, the engine is idle and the current boost air pressure is continuously checked. If the opening of the accelerator pedal exceeds the standard value of 20%, the engine speed is controlled by the clutch operation. By determining if a drop (RPM drop) is occurring, the fuel pump is normally driven or compensated for insufficient fuel.

엔진회전수 감소는 클러치 인게이지에 의해 생기는 현상으로, 차량의 초기 출발시에 엔진회전수의 증가량에 맞게 연료량이 공급되면 발생하지 않게 되나 공급연료량이 부족하거나 엔진에 부하가 걸리게 되면 나타나게 된다.The decrease in engine speed is a phenomenon caused by the clutch engagement, and does not occur when the amount of fuel is supplied according to the increase of the engine speed at the initial start of the vehicle, but appears when the amount of supplied fuel is insufficient or the load is applied to the engine.

첨부도면 2는 본 발명에서 엔진회전수에 따라 무부하 상태와 부하가 걸려 있을 때를 비교한 것으로, 부하가 걸려있을 때에 연료량이 더 많이 필요로 하는 것을 알 수 있다.2 is a comparison of a no-load state and a load applied according to the engine speed according to the present invention, and it can be seen that a larger amount of fuel is required when the load is applied.

이렇게 클러치 인게이지 상태인지를 엔진회전수가 1200rpm 이상 되었는가를 확인하여 엔진회전수 감소현상이 일어나지 않으면 정상적으로 기존의 정상 연료 맵핑을 수행하여 출발을 하게 되고, 만일 엔진회전수가 적정치보다 낮으면 이때의 연료공급량을 측정하게 된다.In this way, if the engine speed is 1200 rpm or more, it is determined whether the clutch engagement state is higher. If the engine speed decrease does not occur, the normal fuel mapping is performed normally. If the engine speed is lower than the proper value, the fuel The supply will be measured.

이 연료량의 측정은 클러치 인게이지 현상이 일어나지 않더라도 엔진에 부하가 걸려 있는 상태라면 그만큼에 해당하는 연료를 더 보상해주기 위한 것으로, 아이들 상태에서의 연료량을 기준으로 공급되는 연료량이 5mg/st 이상인가를 확인하게 된다.This fuel amount measurement is to compensate for the corresponding amount of fuel if the engine is under load even if clutch engagement is not occurring. You will be confirmed.

여기서, 공급되는 연료량이 5mg/st 이하이면 엔진회전수가 더 높아져야 함은 물론 이에 따른 과급공기압 또한 더 높아져야 하기 때문에 상술한 첫번째 단계부터 다시 각 단계를 수행하게 되며, 연료공급량이 기준값 이상이면 이때의 연료량과 미리 설정된 연료량을 비교하게 된다.In this case, if the amount of supplied fuel is 5 mg / st or less, the engine speed should be higher and the boost air pressure must be higher accordingly. Therefore, each step is performed again from the first step described above. And the preset amount of fuel is compared.

이때, 공급된 연료량이 설정된 연료량(H)보다 적으면 일정량씩 연료량을 증가시키는 것을 반복하게 되고, 이렇게 하여 반복하여 증가된 연료량이 설정된 연료량만큼 증가하게 되면 이때의 과급공기압을 확인하게 된다.At this time, if the supplied fuel amount is less than the set fuel amount (H), it is repeated to increase the fuel amount by a predetermined amount, and in this way, if the increased fuel amount is increased by the set fuel amount repeatedly, the boost air pressure at this time is confirmed.

이렇게 과급공기량을 확인하여 연료량에 대하여 과급공기압이 낮으면 현재의 연료량에 대한 연료량을 증가시키는 과정을 반복하게 되고, 과급공기량이 높게 되면 정상적인 연료 맵핑을 수행하게 되는 것이다.As such, if the boost air pressure is low with respect to the fuel amount, the process of increasing the fuel amount with respect to the current fuel amount is repeated. If the boost air amount is high, normal fuel mapping is performed.

즉, 이때의 과급공기압은 과급보상장치의 작동개시에 따른 적정 압력인가를 판단하는 것으로, 첨부도면 3에서 보는 바와 같이 클러치 인게이지 지점인 약 900mmHg에서 작동하게 된다.That is, the boost air pressure at this time is to determine the appropriate pressure according to the operation start of the boost compensation device, as shown in the accompanying drawing 3 will operate at about 900mmHg, the clutch engagement point.

이상에서 본 바와 같이 본 발명은 차량의 아이들 상태와 출발여부를 판단하고, 현재의 엔진회전수에 대하여 클러치 인게이지에 의해 rpm 드롭 현상 및 부하상태인가를 판단하여 연료량의 공급 및 과급공기압을 비교하여 과급보상장치의 작동개시 압력에 도달하였는지를 판정함으로써, 필요한 시점에서 과급압에 대한 연료량 보상이 적절하게 이루어지게 되어 저속에서 출발성능을 향상시킬 수 있는 효과가 있다.As described above, the present invention determines the idle state of the vehicle and whether the vehicle is started, and determines whether the rpm drop phenomenon and the load state are determined by the clutch engagement gauge with respect to the current engine speed, and compares the supply of the fuel amount and the boost air pressure. By determining whether the operation start pressure of the supercharge compensation device has been reached, the fuel amount compensation for the boost pressure is appropriately made at the required time point, thereby improving the starting performance at low speed.

Claims (1)

현재의 엔진회전수와 과급공기압을 측정하여 엔진이 아이들 상태에 있는가를 판단하는 과정과; 가속패달가 개구된 정도를 검출하여 차량이 출발여부를 판단하는 과정과; 클러치 인게이지로 엔진회전수가 떨어졌는지를 확인하여 정상연료맵핑을 수행하거나 상기 과정을 반복하는 과정과; 엔진회전수가 정상인 상태에서 엔진 부하 상태에 따라 적정 연료량인지를 판단하는 과정과; 이 과정에서 연료량이 부족하면 일정량의 연료를 반복하여 적정 연료량만큼 반복하여 보상받는 과정과; 연료공급량이 적정량만큼 보상받아 과급보상장치의 개시 압력에 도달하여 정상 연료 맵핑이 이루어지는가를 판단하는 과정으로 이루어진 것을 특징으로 하는 차량의 출발성능 향상방법.Determining whether the engine is in an idle state by measuring the current engine speed and the boost air pressure; Determining whether the vehicle starts by detecting the degree of opening of the accelerator pedal; Checking whether the engine speed drops with the clutch engagement to perform normal fuel mapping or to repeat the above process; Determining whether the amount of fuel is appropriate according to the engine load state in a state where the engine speed is normal; If the amount of fuel is insufficient in this process, repeating a predetermined amount of fuel and repeatedly compensating for the appropriate amount of fuel; A method of improving starting performance of a vehicle, comprising: determining whether a normal fuel mapping is achieved by reaching a starting pressure of a turbocharger by compensating a fuel supply amount by an appropriate amount.
KR1019990045056A 1999-10-18 1999-10-18 Improved method for starting performance of vehicle KR20010037491A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100427293B1 (en) * 2001-12-18 2004-04-14 현대자동차주식회사 Method of controlling fuel for diesel engine
KR100527702B1 (en) * 2002-09-26 2005-11-09 현대자동차주식회사 a device and the method for a correction of fuel injection in diesel engine
KR100931115B1 (en) * 2007-12-12 2009-12-10 현대자동차주식회사 How to improve the startability of diesel engines

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63174548U (en) * 1987-03-13 1988-11-11
JPH05106479A (en) * 1991-10-16 1993-04-27 Nissan Motor Co Ltd Output control device for internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63174548U (en) * 1987-03-13 1988-11-11
JPH05106479A (en) * 1991-10-16 1993-04-27 Nissan Motor Co Ltd Output control device for internal combustion engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100427293B1 (en) * 2001-12-18 2004-04-14 현대자동차주식회사 Method of controlling fuel for diesel engine
KR100527702B1 (en) * 2002-09-26 2005-11-09 현대자동차주식회사 a device and the method for a correction of fuel injection in diesel engine
KR100931115B1 (en) * 2007-12-12 2009-12-10 현대자동차주식회사 How to improve the startability of diesel engines

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