KR20090099781A - Diesel engine equipped with a water pump and a method for controlling the same - Google Patents

Diesel engine equipped with a water pump and a method for controlling the same Download PDF

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Publication number
KR20090099781A
KR20090099781A KR1020080024963A KR20080024963A KR20090099781A KR 20090099781 A KR20090099781 A KR 20090099781A KR 1020080024963 A KR1020080024963 A KR 1020080024963A KR 20080024963 A KR20080024963 A KR 20080024963A KR 20090099781 A KR20090099781 A KR 20090099781A
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South Korea
Prior art keywords
temperature
water pump
engine
cooling water
controlling
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KR1020080024963A
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Korean (ko)
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KR101371439B1 (en
Inventor
유승범
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현대자동차주식회사
현대자동차 유럽기술연구소
기아자동차주식회사
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Priority to KR1020080024963A priority Critical patent/KR101371439B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P5/12—Pump-driving arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F01P2025/64—Number of revolutions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F01P2025/66—Vehicle speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2050/00—Applications
    • F01P2050/22—Motor-cars

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

PURPOSE: A diesel engine equipped with a water pump and a method for controlling the same are provided to reduce engine load and improve efficiency by driving the water pump with electrical energy. CONSTITUTION: A diesel engine equipped with a water pump comprises a water pump(102), a control unit(100), and a diesel engine(104). In the engine, the water pump is driven with electricity and circulates the cooling water of the engine. The control unit controls the flow of the cooling water by controlling the capacity of the water pump. The control unit senses cooling water temperature, external temperature, discharge temperature, engine RPM, and car speed. The diesel engine includes the water pump controlling the pumping capacity of the water pump.

Description

워터펌프를 구비한 디젤엔진 및 이의 제어 방법{DIESEL ENGINE EQUIPPED WITH A WATER PUMP AND A METHOD FOR CONTROLLING THE SAME}Diesel engine with water pump and its control method {DIESEL ENGINE EQUIPPED WITH A WATER PUMP AND A METHOD FOR CONTROLLING THE SAME}

본 발명은 워터펌프를 구비한 디젤엔진에 관한 것으로서, 전기 에너지로 구동되는 워터펌프에 의해서 냉각수의 흐름 양이 컨트롤되는 디젤엔진 및 이의 제어 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diesel engine having a water pump, and more particularly, to a diesel engine and a control method thereof in which an amount of cooling water is controlled by a water pump driven by electric energy.

일반적으로 엔진에는 쿨링 시스템이 필요하다. 만약 쿨링 시스템이 없으면 부품들은 고열에 의해서 정상적으로 작동하지 않는다.In general, the engine requires a cooling system. If there is no cooling system, the parts will not work normally due to high heat.

상기 쿨링 시스템은 워터 자켓, 써모스탯, 워터펌프, 라디에이터, 캡, 팬, 팬 벨트 및 냉각수 호스 등을 포함한다.The cooling system includes a water jacket, a thermostat, a water pump, a radiator, a cap, a fan, a fan belt, a coolant hose, and the like.

일반적으로 워터펌프는 자체적인 구동력을 가지고 있지 않다. 따라서 상기 워터펌프는 엔진의 크랭크 샤프트의 운동 에너지를 전달받아 작동된다.Generally, the water pump does not have its own driving force. Therefore, the water pump is operated by receiving the kinetic energy of the crankshaft of the engine.

엔진이 시동되면 엔진의 냉각수온이나 운전조건에 상관없이 상기 워터펌프는 작동되고, 냉각수는 상기 엔진 내부 또는 라디에이터를 순환한다.When the engine is started, the water pump is operated regardless of the coolant temperature or the operating conditions of the engine, and the coolant circulates in the engine or the radiator.

엔진이 웜웝(warm up)되기 전에 냉각수가 강제로 순환되므로 배기가스의 온도도 천천히 올라가게 된다. 한편 배기가스의 정화효율을 향상시키기 위해서는 배 기가스의 온도가 적정한 고온(예를 들면, 250℃)이 되어야 한다.As the coolant is forced to circulate before the engine warms up, the temperature of the exhaust gases also rises slowly. On the other hand, in order to improve the purification efficiency of the exhaust gas, the temperature of the exhaust gas should be an appropriate high temperature (for example, 250 ℃).

특히, 디젤엔진에서 SCR 또는 LNT 시스템을 적용했을 때 NOx의 정화효율을 향상시키는 방법은 배기가스의 온도를 신속하게 정상 온도로 높이는 것이다. In particular, when applying the SCR or LNT system in a diesel engine, a method of improving the NOx purification efficiency is to quickly increase the exhaust gas temperature to a normal temperature.

이와 같이 배기가스의 온도를 높여야 하는 시기에 낮은 온도의 냉각수가 강제로 순환되는 경우 배기가스는 더 천천히 정상 온도에 도달하게 된다.As such, when coolant of low temperature is forced to circulate at a time when the temperature of the exhaust gas needs to be increased, the exhaust gas reaches the normal temperature more slowly.

냉각수온이 적정한 온도에 이르는 시간은 디젤엔진일 경우 가솔린엔진과 대비해서 30-50% 느리므로 디젤엔진의 배기가스 정화효율이 더욱 낮아지는 문제점이 있다.When the temperature of the cooling water reaches an appropriate temperature is 30-50% slower than that of the gasoline engine in the case of the diesel engine, the exhaust gas purification efficiency of the diesel engine is further lowered.

본 발명은, 엔진을 웜웝시킬 때 배기가스의 온도를 적정수준으로 높이기 위해서 냉각수의 순환을 컨트롤하는 워터펌프를 구비한 디젤엔진 및 이의 제어 방법을 제공한다.The present invention provides a diesel engine having a water pump for controlling the circulation of cooling water in order to raise the temperature of the exhaust gas to an appropriate level when the engine is warmed, and a control method thereof.

또한 냉각수온의 온도가 적정온도 미만일 경우 냉각수의 흐름 양을 저감시키고 냉각수온의 온도가 적정온도 이상일 경우 냉각수의 흐름 양을 늘리는 워터펌프를 구비한 디젤엔진 및 이의 제어 방법을 제공한다.In addition, the present invention provides a diesel engine having a water pump and a method of controlling the same, which reduces the amount of flow of the cooling water when the temperature of the cooling water is lower than the appropriate temperature and increases the amount of cooling water when the temperature of the cooling water is higher than the appropriate temperature.

본 실시예에 따른 워터펌프를 구비한 디젤엔진은, 전기에 의해서 작동되어 상기 엔진의 냉각수를 순환시키는 워터펌프 및 상기 워터펌프의 용량을 제어하여 상기 냉각수의 흐름 양을 제어하는 제어 유닛을 포함하고, 상기 제어 유닛은 냉각수온, 외부온도, 배기온도, 엔진 알피엠(RPM) 및 차속을 감지하여 상기 워터펌프의 펌핑 용량을 제어할 수 있다.A diesel engine having a water pump according to the present embodiment includes a water pump operated by electricity to circulate the cooling water of the engine, and a control unit controlling the flow amount of the cooling water by controlling the capacity of the water pump. The control unit may control the pumping capacity of the water pump by detecting a coolant temperature, an external temperature, an exhaust temperature, an engine RPM, and a vehicle speed.

또한 상기 배기온도가 250℃ 미만일 때 상기 워터펌프는 상기 차속과 상기 냉각수온의 크기에 따라서 상기 워터펌프의 듀티 값을 제어하고, 상기 배기온도가 250℃ 이상일 때 상기 워터펌프는 상기 차속과 상기 알피엠의 크기에 의해서 설정된 상기 냉각수온의 목표치에 따라서 상기 워터펌프를 듀티 값을 제어할 수 있다.In addition, the water pump controls the duty value of the water pump according to the size of the vehicle speed and the cooling water temperature when the exhaust temperature is less than 250 ℃, the water pump is the vehicle speed and the ALPM when the exhaust temperature is 250 ℃ or more According to the target value of the cooling water temperature set by the size of the water pump can control the duty value.

또한 상기 엔진에서 배출되는 배기가스를 정화하기 위한 후처리 장치에 구비된 촉매(catalyst)의 온도를 체크하는 온도 센서를 포함하고, 상기 냉각수온이 설 정된 목표치 미만이면 상기 워터펌프의 듀티 값을 감소시켜 상기 냉각수의 흐름 양을 저감시키고, 상기 냉각수온이 설정된 목표치 이상이면 상기 워터펌프의 듀티 값을 증가시킴으로써 상기 냉각수의 흐름 양을 증가시킬 수 있다.In addition, a temperature sensor for checking the temperature of the catalyst (catalyst) provided in the after-treatment device for purifying the exhaust gas discharged from the engine, and if the cooling water temperature is less than the set target value to reduce the duty value of the water pump By reducing the flow amount of the cooling water, if the cooling water temperature is greater than the set target value it can be increased by increasing the duty value of the water pump.

아울러, 본 실시예에 따른 워터펌프를 구비한 디젤엔진의 제어 방법은, 엔진의 냉각수온을 감지하는 제1 단계, 엔진의 알피엠을 감지하는 제2 단계, 차량의 속도를 감지하는 제3 단계, 배기가스의 온도를 감지하는 제4 단계 및 상기 냉각수온, 상기 알피엠, 상기 속도 및 상기 배기가스의 온도에 따라서 전기 에너지에 의해서 구동되는 워터펌프의 듀티 값을 제어하여 냉각수의 흐름 양을 제어하는 제5 단계를 포함할 수 있다.In addition, the control method of the diesel engine having a water pump according to the present embodiment, the first step of detecting the cooling water temperature of the engine, the second step of detecting the AlpM of the engine, the third step of detecting the speed of the vehicle, A fourth step of sensing the temperature of the exhaust gas and controlling a duty value of the water pump driven by the electric energy according to the cooling water temperature, the ALPM, the speed and the temperature of the exhaust gas to control the flow amount of the cooling water. It may include five steps.

또한 상기 제5 단계에서, 상기 배기가스의 온도가 250℃ 미만일 경우 상기 워터펌프는 상기 냉각수온과 상기 속도에 의해서 설정된 듀티 값으로 컨트롤되고, 상기 제5 단계에서, 상기 배기가스의 온도가 250℃ 이상일 경우 상기 워터펌프는 상기 속도와 상기 알피엠에 의해서 설정된 상기 냉각수온의 목표치에 의해서 컨트롤될 수 있다.In addition, in the fifth step, when the temperature of the exhaust gas is less than 250 ℃ the water pump is controlled to the duty value set by the cooling water temperature and the speed, in the fifth step, the temperature of the exhaust gas is 250 ℃ If abnormal, the water pump may be controlled by the speed and the target value of the cooling water temperature set by the ALPM.

또한 상기 냉각수온이 설정된 냉각수온의 목표치 미만일 경우 상기 워터펌프의 듀티 값을 증가시켜 냉각수의 흐름 양을 증가시키고, 상기 냉각수온이 설정된 냉각수온의 목표치 이상일 경우 상기 워터펌프의 듀티 값을 감소시켜 냉각수의 흐름 양을 저감시킬 수 있다. 또한 상기 워터펌프의 최소 및 최대 듀티 값을 체크하는 것이 바람직하다.In addition, when the cooling water temperature is less than the target value of the set cooling water temperature, the duty value of the water pump is increased to increase the flow amount of the cooling water, and when the cooling water temperature is more than the target value of the set cooling water temperature, the duty value of the water pump is reduced to reduce the cooling water. Can reduce the amount of flow. It is also desirable to check the minimum and maximum duty values of the water pump.

이상 설명한 바와 같이 본 발명의 실시예에 따른 워터펌프를 구비한 디젤엔진에 의하면, 워터펌프가 전기에너지로 구동됨으로써 엔진로드가 감소하고, 효율이 향상된다.As described above, according to the diesel engine having the water pump according to the embodiment of the present invention, the engine load is reduced and the efficiency is improved by driving the water pump with electric energy.

또한, 엔진의 운동상태와 주행 상태에 따라서 워터펌프가 가변적으로 구동됨으로써 엔진의 워업시간이 줄어들고 배기가스가 신속하게 정상범위에 도달한다.In addition, the water pump is variably driven according to the motion state and the driving state of the engine, thereby reducing the engine up time and rapidly exhausting the exhaust gas.

아울러, 배기가스의 온도가 신속하게 정상범위에 도달하므로 배기가스의 정화효율이 향상된다.In addition, since the temperature of the exhaust gas rapidly reaches the normal range, the purification efficiency of the exhaust gas is improved.

이하, 첨부한 도면을 참고로 하여 본 발명의 실시예에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

이하, 첨부한 도면을 참고로 하여, 본 발명의 실시예에 따른 워터펌프를 구비한 디젤엔진에 대해 상세히 설명한다.Hereinafter, a diesel engine having a water pump according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 실시예에 따른 워터펌프를 구비한 디젤엔진의 구성도이다.1 is a block diagram of a diesel engine having a water pump according to an embodiment of the present invention.

도 1을 참조하면, 차량은 전자 제어 유닛(100, ECU: engine control unit), 워터펌프(102), 엔진(104) 및 라디에이터(106)를 구비한다.Referring to FIG. 1, a vehicle includes an electronic control unit 100, an engine control unit (ECU), a water pump 102, an engine 104, and a radiator 106.

또한, 배기라인 중간에는 정화장치(112)가 구비되고, 상기 정화장치(112)에는 온도 센서(110)가 구비되며, 상기 엔진(104)과 상기 라디에이터(106) 사이 냉각수 라인에는 써모스텟(108)이 장착된다.In addition, a purifier 112 is provided in the middle of the exhaust line, the purifier 112 is provided with a temperature sensor 110, and a thermostat 108 in the cooling water line between the engine 104 and the radiator 106. ) Is mounted.

상기 전자 제어 유닛(100)은 상기 엔진(104)과 상기 정화장치(112)에 구비된 센서 등을 통해서 외기온도(Temperature of Atmosphere), 엔진의 냉각수온(Temperature of Cooling Water), 엔진의 알피엠(Rotation Per Minute), 차량의 속도(Velocity) 및 배기가스 온도(Temperature of Exhaust Gas) 등에 대한 데이터 신호를 인가 받는다.The electronic control unit 100 uses a sensor of the engine 104 and the purifier 112 to provide an outdoor temperature, a temperature of the engine, and an engine of the engine. Data signals for Rotation Per Minute, Velocity of Vehicle, and Temperature of Exhaust Gas are received.

상기 정화장치(112)는 SCR/LNT system을 갖고 있으며, 상기 system에는 산소를 검출하는 산소센서(미도시)와 NOx검출하는 NOx센서(미도시)가 설치되는 것이 바람직하다. 본 실시예에서 상기 산소센서와 상기 NOx센서에 대해서는 언급하지 않는다.The purifier 112 has an SCR / LNT system, and the system is preferably provided with an oxygen sensor (not shown) for detecting oxygen and a NOx sensor (not shown) for detecting NOx. In this embodiment, the oxygen sensor and the NOx sensor are not mentioned.

상기 냉각수온(TCW: temperature of cooling water)의 온도가 낮으면 상기 써모스탯(108)에 의해서 상기 엔진(104)에서만 냉각수가 순환하고, 상기 냉각수온(TCW)의 온도가 높으면 상기 엔진(104)과 상기 라디에이터(106) 사이에 냉각수가 순환한다.When the temperature of the cooling water (TCW) is low, the coolant circulates only in the engine 104 by the thermostat 108, and when the temperature of the cooling water temperature TCW is high, the engine 104. And the coolant circulates between the radiator 106.

본 실시예에서, 상기 워터펌프(102)는 상기 전자 제어 유닛(100)의 제어 신호에 따라서 전기적인 에너지로 작동된다. 또한 상기 냉각수온(TCW)이나 배기가스 온도(TEG: temperature of exhaust gas) 등에 따라서 상기 워터펌프(102)의 작동 용량이 적절하게 컨트롤된다.In this embodiment, the water pump 102 is operated with electrical energy in accordance with the control signal of the electronic control unit 100. In addition, the operating capacity of the water pump 102 is appropriately controlled according to the cooling water temperature TCW, the temperature of exhaust gas (TEG), and the like.

도 2는 본 발명의 실시예에 따른 워터펌프를 구비한 디젤엔진의 배기가스 제어 순서도이다.2 is a flowchart illustrating an exhaust gas control of a diesel engine having a water pump according to an exemplary embodiment of the present invention.

도 2를 참조하면, 외기온도(TA: Temperature of Atmosphere), 냉각수 온(TCW), 속도(V: velocity), 배기가스 온도(TEG) 등의 데이터 신호가 입력되고, 상기 배기가스의 온도(TEG)가 250℃ 미만인지를 판단한다.Referring to FIG. 2, data signals such as a temperature of atmosphere (TA), a coolant temperature (TCW), a velocity (V), and an exhaust gas temperature (TEG) are input, and the temperature of the exhaust gas (TEG) is input. ) Is determined to be less than 250 ° C.

정화장치의 정화효율이 50%를 넘는 온도를 LOT(light off temperature)라고 하는데, 본 실시예에서 LOT는 약 250℃ 이다.The temperature at which the purification efficiency of the purification device exceeds 50% is called light off temperature (LOT). In this embodiment, the LOT is about 250 ° C.

상기 배기가스 온도(TEG)가 250℃ 미만이면 상기 냉각수온(TCW)과 차량의 속도(V)에 의해서 상기 워터펌프(102)의 듀티 값이 조절된다.When the exhaust gas temperature TEG is less than 250 ° C., the duty value of the water pump 102 is adjusted by the cooling water temperature TCW and the speed V of the vehicle.

또한 상기 배기가스(TEG)의 온도가 250℃ 이상이면 상기 엔진(104)의 알피엠(RPM)과 냉각수온(TCW)에 의해서 설정된 상기 냉각수온(TCW)의 목표치에 따라 상기 워터펌프(102)의 듀티 값이 콘트롤된다.In addition, when the temperature of the exhaust gas (TEG) is 250 ℃ or more according to the target value of the cooling water temperature (TCW) set by the RPM (RPM) and the cooling water temperature (TCW) of the engine 104 of the water pump 102 The duty value is controlled.

도 3a 및 도 3b는 본 발명의 실시예에 따른 워터펌프를 구비한 디젤엔진의 실험 데이터 표이다.3A and 3B are experimental data tables of a diesel engine having a water pump according to an embodiment of the present invention.

도 3a를 참조하면, 가로는 냉각수온(TCW)을 나타내고, 세로는 차량의 속도(V)를 나타낸다. 전술한 바와 같이, 배기가스의 온도가 250℃ 미만일 때 상기 워터펌프(102)에 의해서 순환되는 냉각수의 흐름 양은 냉각수온(TCW)과 속도(V)에 의해서 컨트롤된다.Referring to FIG. 3A, the horizontal represents the cooling water temperature TCW, and the vertical represents the speed V of the vehicle. As described above, the flow amount of the cooling water circulated by the water pump 102 when the temperature of the exhaust gas is less than 250 ° C is controlled by the cooling water temperature (TCW) and the speed (V).

예를 들어, 냉각수온(TCW)이 -20℃이고 속도(V)가 20km/h 일 때, 듀티 값은 0%므로 상기 워터펌프(102)는 최소 또는 작동되지 않는다. 또한 냉각수온(TCW)이 40℃이고 속도(V)가 60km/h 일 때, 상기 워터펌프(102)의 듀티 갑은 30%로 설정된다.For example, when the cooling water temperature (TCW) is -20 ° C and the speed (V) is 20 km / h, the water pump 102 is minimum or not activated because the duty value is 0%. In addition, when the cooling water temperature (TCW) is 40 ℃ and the speed (V) 60km / h, the duty box of the water pump 102 is set to 30%.

상기와 같이 냉각수온(TCW) 및 상기 배기가스 온도(TEG)에 따라서 상기 워터 펌프(102)의 작동 용량이 저감되어 상기 냉각수온(TCW)과 상기 배기가스 온도(TEG)가 정상 온도로 신속하게 도달하게 된다. 따라서 엔진의 연비와 힘뿐만 아니라 상기 정화장치(112)의 정화효율도 향상된다.As described above, the operating capacity of the water pump 102 is reduced according to the cooling water temperature TCW and the exhaust gas temperature TEG so that the cooling water temperature TCW and the exhaust gas temperature TEG are quickly returned to the normal temperature. Will be reached. Therefore, the fuel efficiency and power of the engine as well as the purification efficiency of the purifier 112 is improved.

도 3b를 참조하면, 전술한 바와 같이, 상기 배기가스(TEG)의 온도가 250℃ 이상일 때 상기 워터펌프(102)는 속도(V)와 알피엠(RPM)에 의해서 설정된 냉각수온(TCW)의 목표치에 따라 컨트롤된다.Referring to FIG. 3B, as described above, when the temperature of the exhaust gas TEG is 250 ° C. or more, the water pump 102 has a target value of the cooling water temperature TCW set by the speed V and RPM. Controlled by

예를 들어, 속도(V)가 20km/h이고 알피엠(RPM)이 2000일 때 냉각수온(TCW)의 목표치(object value)는 100℃가 된다. 상기 목표치(object value)와 실제 냉각수온(TCW)을 비교하여 상기 워터펌프(102)의 용량을 조절한다.For example, when the speed V is 20 km / h and the RPM is 2000, the object value of the cooling water temperature TCW becomes 100 ° C. The capacity of the water pump 102 is adjusted by comparing the object value with the actual cooling water temperature TCW.

도 4는 본 발명의 실시예에 따른 워터펌프를 구비한 디젤엔진의 냉각수온 제어 순서도이다.Figure 4 is a flow chart of the cooling water temperature control of the diesel engine having a water pump according to an embodiment of the present invention.

전술한 바와 같이, 현재 차량의 속도(V)와 알피엠(RPM)에 의해서 냉각수온(TCW)의 목표치(object value)가 설정되고, 실제 냉각수온(TCW)의 크기와 상기 목표치(object value)가 서로 비교된다.As described above, an object value of the cooling water temperature TCW is set by the speed V and the RPM of the current vehicle, and the size and the object value of the actual cooling water temperature TCW are set. Are compared with each other.

만약 실제 냉각수온(TCW)이 상기 목표치(object value)보다 작으면 상기 워터펌프(102)의 듀티를 감소시켜 냉각수가 천천히 순환하도록 하고, 실제 냉각수온(TCW)이 상기 목표치(object value)보다 크면 상기 워터펌프(102)의 듀티를 증가시켜 냉각수가 빨리 순환하도록 한다.If the actual cooling water temperature TCW is less than the object value, the duty of the water pump 102 is reduced to allow the cooling water to circulate slowly, and if the actual cooling water temperature TCW is greater than the object value. The duty of the water pump 102 is increased to allow the coolant to circulate faster.

상기 냉각수온(TCW)의 목표치(object value)를 피드백 콘트롤(feed back control)함으로써 상기 냉각수온(TCW)은 상기 목표치(object value) 부근에서 항상 일정하게 유지된다.By feedback control of the object value of the cooling water temperature TCW, the cooling water temperature TCW is always kept constant near the object value.

상기 워터펌프(102)의 최소 및 최대 운전량을 컨트롤하기 위해서, 도시한 바와 같이 상기 워터펌프(102)의 최소 및 최대 듀티 값을 계속적으로 체크하는 것이 바람직하다.In order to control the minimum and maximum operation amount of the water pump 102, it is preferable to continuously check the minimum and maximum duty values of the water pump 102 as shown.

본 실시예에서, 상기 정화장치(112)에 SCR 또는 LNT system을 적용할 때 NOx의 정화 효율은 상기 정화장치(112)에 구비된 촉매(catalyst)의 온도가 얼마나 신속하게 정상 온도로 상승하느냐에 달렸다.In this embodiment, the purification efficiency of NOx when applying the SCR or LNT system to the purifier 112 depends on how quickly the temperature of the catalyst (catalyst) provided in the purifier 112 rises to the normal temperature. .

실제로 냉간 상태에서 엔진이 시동되면 정화장치의 촉매 온도가 낮아 정화효율이 낮아짐으로써 배기관에서 검은 연기(먼지와 NOx)가 발생되는 것을 볼 수 있다. In fact, when the engine is started in a cold state, the catalyst temperature of the purifier is lowered, thereby lowering the purification efficiency, and thus, black smoke (dust and NOx) is generated in the exhaust pipe.

특히 디젤 엔진의 냉각수는 적정 온도에 도달하는 시간이 가솔린 엔진보다30 내지 50% 늦기 때문에 냉각수의 온도를 신속하게 올리는 것이 더욱 중요하다.In particular, it is more important to increase the temperature of the coolant rapidly because the cooling water of the diesel engine is 30 to 50% later than the gasoline engine.

또한, 본 실시예에서, 상기 워터펌프(102)의 작동 용량이 자동차의 운행 상태에 따라서 적절하게 컨트롤됨으로써 상기 라디에이터(106)의 크기와 용량도 최소화될 수 있다.In addition, in the present embodiment, the operating capacity of the water pump 102 is appropriately controlled according to the driving state of the vehicle so that the size and capacity of the radiator 106 may be minimized.

본 실시예에서는 냉각수와 배기가스의 온도가 낮은 상태에서 상기 워터펌프(102)의 운전을 적절하게 컨트롤함으로써 냉각수온과 배기가스의 온도를 신속하게 올리고 상기 정화장치(112)의 정화효율과 상기 엔진(104)의 연비를 동시에 상승시킨다.In this embodiment, by controlling the operation of the water pump 102 in a state where the temperature of the cooling water and the exhaust gas is low, the temperature of the cooling water temperature and the exhaust gas is quickly raised, and the purification efficiency of the purifier 112 and the engine are increased. The fuel economy of 104 is raised at the same time.

이상을 통해 본 발명의 실시예에 대하여 설명하였지만, 본 발명은 이에 한정 되는 것이 아니고 특허청구범위와 발명의 상세한 설명 및 첨부한 도면의 범위 안에서 여러 가지로 변형하여 실시하는 것이 가능하고 이 또한 본 발명의 범위에 속하는 것은 당연하다.Although the embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

도 1은 본 발명의 실시예에 따른 워터펌프를 구비한 디젤엔진의 구성도이다.1 is a block diagram of a diesel engine having a water pump according to an embodiment of the present invention.

도 2는 본 발명의 실시예에 따른 워터펌프를 구비한 디젤엔진의 배기가스 제어 순서도이다.2 is a flowchart illustrating an exhaust gas control of a diesel engine having a water pump according to an exemplary embodiment of the present invention.

도 3a 및 도 3b는 본 발명의 실시예에 따른 워터펌프를 구비한 디젤엔진의 실험 데이터 표이다.3A and 3B are experimental data tables of a diesel engine having a water pump according to an embodiment of the present invention.

도 4는 본 발명의 실시예에 따른 워터펌프를 구비한 디젤엔진의 냉각수온 제어 순서도이다.Figure 4 is a flow chart of the cooling water temperature control of the diesel engine having a water pump according to an embodiment of the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

100: 전자 제어 유닛(ECU)100: electronic control unit (ECU)

102: 워터펌프102: water pump

104: 엔진104: engine

106: 라디에이터106: radiator

108: 써모스탯108: thermostat

110: 온도 센서110: temperature sensor

112: 정화장치112: purifier

Claims (5)

엔진에 있어서,In the engine, 전기에 의해서 작동되어 상기 엔진의 냉각수를 순환시키는 워터펌프; 및A water pump operated by electricity to circulate the coolant of the engine; And 상기 워터펌프의 용량을 제어하여 상기 냉각수의 흐름 양을 제어하는 제어 유닛;A control unit for controlling the flow amount of the cooling water by controlling the capacity of the water pump; 을 포함하고,Including, 상기 제어 유닛은 냉각수온, 외부온도, 배기온도, 엔진 알피엠(RPM) 및 차속을 감지하여 상기 워터펌프의 펌핑 용량을 콘트롤하는 워터펌프를 구비한 디젤엔진.The control unit is a diesel engine having a water pump for controlling the pumping capacity of the water pump by sensing the coolant temperature, external temperature, exhaust temperature, engine RPM and vehicle speed. 제1 항에 있어서,According to claim 1, 상기 배기온도가 250℃ 미만일 때 상기 워터펌프는 상기 차속과 상기 냉각수온의 크기에 따라서 상기 워터펌프의 듀티 값을 제어하고,When the exhaust temperature is less than 250 ℃ the water pump controls the duty value of the water pump according to the vehicle speed and the magnitude of the cooling water temperature, 상기 배기온도가 250℃ 이상일 때 상기 워터펌프는 상기 차속과 상기 알피엠의 크기에 의해서 설정된 상기 냉각수온의 목표치에 따라서 상기 워터펌프를 듀티 값을 제어하는 워터펌프를 구비한 디젤엔진.And a water pump for controlling the duty value of the water pump according to a target value of the cooling water temperature set by the vehicle speed and the size of the ALPM when the exhaust temperature is 250 ° C. or more. 엔진의 냉각수온을 감지하는 제1 단계;A first step of detecting the coolant temperature of the engine; 엔진의 알피엠을 감지하는 제2 단계;A second step of detecting an ALPM of the engine; 차량의 속도를 감지하는 제3 단계;Detecting a speed of the vehicle; 배기가스의 온도를 감지하는 제4 단계; 및A fourth step of sensing the temperature of the exhaust gas; And 상기 냉각수온, 상기 알피엠, 상기 속도 및 상기 배기가스의 온도에 따라서 전기 에너지에 의해서 구동되는 워터펌프의 듀티 값을 제어하여 냉각수의 흐름 양을 제어하는 제5 단계;A fifth step of controlling a flow amount of the cooling water by controlling a duty value of the water pump driven by electric energy according to the cooling water temperature, the ALPM, the speed, and the temperature of the exhaust gas; 를 포함하는 워터펌프를 구비한 디젤엔진의 제어 방법.Control method of a diesel engine having a water pump comprising a. 제3 항에 있어서,The method of claim 3, wherein 상기 제5 단계에서,In the fifth step, 상기 배기가스의 온도가 250℃ 미만일 경우 상기 워터펌프는 상기 냉각수온과 상기 속도에 의해서 설정된 듀티 값으로 컨트롤되는 워터펌프를 구비한 디젤엔진의 제어 방법.And the water pump is controlled to a duty value set by the cooling water temperature and the speed when the temperature of the exhaust gas is less than 250 ° C. 제3 항에 있어서,The method of claim 3, wherein 상기 제5 단계에서,In the fifth step, 상기 배기가스의 온도가 250℃ 이상일 경우 상기 워터펌프는 상기 속도와 상기 알피엠에 의해서 설정된 상기 냉각수온의 목표치에 의해서 컨트롤되는 워터펌프를 구비한 디젤엔진의 제어 방법.And the water pump is controlled by the speed and the target value of the cooling water temperature set by the ALPM when the temperature of the exhaust gas is 250 ° C or higher.
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CN106382154A (en) * 2016-11-04 2017-02-08 力帆实业(集团)股份有限公司 Motorcycle cooling system and engine cooling method
CN111561381A (en) * 2020-04-20 2020-08-21 中国第一汽车股份有限公司 Intelligent closed-loop control heat management method for gasoline engine based on electric water pump
CN115163282A (en) * 2022-07-14 2022-10-11 东风汽车集团股份有限公司 Control method and control system for cooling engine

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KR20020058787A (en) * 2000-12-30 2002-07-12 이계안 Method for a water pump on/off controlling in vehicles
JP4446914B2 (en) * 2005-03-22 2010-04-07 ダイハツ工業株式会社 Heat dissipation device control method for internal combustion engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106382154A (en) * 2016-11-04 2017-02-08 力帆实业(集团)股份有限公司 Motorcycle cooling system and engine cooling method
CN111561381A (en) * 2020-04-20 2020-08-21 中国第一汽车股份有限公司 Intelligent closed-loop control heat management method for gasoline engine based on electric water pump
CN115163282A (en) * 2022-07-14 2022-10-11 东风汽车集团股份有限公司 Control method and control system for cooling engine
CN115163282B (en) * 2022-07-14 2023-12-05 东风汽车集团股份有限公司 Control method and control system for engine cooling

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