KR20090055232A - A thermostat control method for preventing engine frozen - Google Patents

A thermostat control method for preventing engine frozen Download PDF

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Publication number
KR20090055232A
KR20090055232A KR1020070122053A KR20070122053A KR20090055232A KR 20090055232 A KR20090055232 A KR 20090055232A KR 1020070122053 A KR1020070122053 A KR 1020070122053A KR 20070122053 A KR20070122053 A KR 20070122053A KR 20090055232 A KR20090055232 A KR 20090055232A
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South Korea
Prior art keywords
temperature
engine
pcv
nipple
cooling circuit
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KR1020070122053A
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Korean (ko)
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김석태
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현대자동차주식회사
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Priority to KR1020070122053A priority Critical patent/KR20090055232A/en
Publication of KR20090055232A publication Critical patent/KR20090055232A/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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/16—Indicating devices; Other safety devices concerning coolant 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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/20—Indicating devices; Other safety devices concerning atmospheric freezing conditions, e.g. automatically draining or heating during frosty weather
    • 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
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • 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
    • 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)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

A thermostat control method of an engine cooling circuit for preventing engine freeze is provided to prevent engine freeze by increasing the engine temperature and the blow-by gas temperature going out through the PCV valve. A thermostat control method of an engine cooling circuit for preventing engine freeze comprises as follows. An ECU (Electric Control Unit) determines whether outside temperature is the preset freezing temperature or not. When the outside temperature is the freezing temperature, the ECU determines whether the valve temperature on the PCV(Positive Crankcase Ventilation) is lower than that the nipple temperature or not. When PCV nipple freeze is detected, the engine cooling circuit is driven by increasing an electric thermostat opening temperature.

Description

엔진 결빙 방지를 위한 엔진 냉각 회로의 써모스탯 제어방법 {a thermostat control method for preventing engine frozen}Thermostat control method for preventing engine freezing {a thermostat control method for preventing engine frozen}

본 발명은 엔진 결빙 방지를 위한 엔진 냉각 회로의 써모스탯 제어방법에 관한 것으로, 더 자세하게는 외부기온이 엔진 결빙발생온도에 해당되고 PCV 밸브측 온도가 PCV 니플측 온도보다 낮을 때에 전자식 써모스탯 개방온도를 상승시켜 엔진 온도 및 PCV 밸브측 블로바이 가스 온도를 상승시키도록 한 것에 관한 것이다.The present invention relates to a thermostat control method of an engine cooling circuit for preventing engine freezing. More specifically, the electronic thermostat opening temperature when the external air temperature corresponds to the engine freezing temperature and the PCV valve side temperature is lower than the PCV nipple side temperature. To raise the engine temperature and the PCV valve side blow-by gas temperature.

일반적으로 유럽, 북미, 중국, 러시아 등 혹한기 기후에 있는 지역에서 장시간 운전시 엔진에 구성된 벤틸레이션 시스템(VENTILATION SYSTEM)은 낮은 온도 및 주행풍 등으로 결빙이 발생될 수 있다.In general, in a cold climate region such as Europe, North America, China, Russia, the VENTILATION SYSTEM configured in the engine during long time operation may cause freezing due to low temperature and running wind.

이러한 결빙을 방지하기 위하여 벤틸레이션계 호스(HOSE)에 보온용 패드를 적용하거나 엔진룸 내에 엔진커버를 적용하거나 온수 라인을 설치하는 등의 보온 대책이 강구되고 있다.In order to prevent such freezing, a thermal insulation measure such as applying a thermal pad to a ventilation hose, applying an engine cover in an engine room, or installing a hot water line has been taken.

도 1에는 차량 벤틸레이션 시스템의 개략 구성도가 도시되어 있고, 도 2에는 동 벤틸레이션 시스템의 PCV 니플의 종단면도가 도시되어 있다.1 is a schematic structural diagram of a vehicle ventilation system, and FIG. 2 is a longitudinal cross-sectional view of a PCV nipple of the ventilation system.

종래의 벤틸레이션 시스템은 엔진의 열기를 보존하기 위한 보온 대책(보온용 PAD, 엔진 커버, 온수라인 등)으로 엔진 조립시 복잡성, 추가 비용 발생, 더 큰 엔진룸 레이아웃(LAYOUT) 확보 등 생산성 문제 및 확실한 보온이 유지되지 못할 경우 바로 결빙이 발생되는 결함을 안고 있다.Conventional ventilation system is a thermal insulation measure (thermal insulation PAD, engine cover, hot water line, etc.) to preserve the heat of the engine, productivity problems such as complexity, additional cost, larger engine room layout (LAYOUT) when assembling the engine and There is a defect that can cause freezing immediately if it is not kept warm.

그리고 실차 상태에서의 벤틸레이션은 스로틀 부분 개도된 상태로 브리더(BREATHER) 측보다는 주로 PCV(Positive Crankcase Ventilation) 밸브를 통하여 블로바이 가스(BLOW-BY GAS) 이동이 이루어지며, 결빙 발생상태를 보면 PCV 밸브를 통하여 외부로 유출된 따뜻한 블로바이 가스가 서지탱크(S/TANK)측 스로틀 바디를 통하여 유입된 차가운 흡입 공기와 만나면서 가스내 함유된 수증기에 의하여 PCV 니플의 서지탱크(S/TANK)측에 결빙이 발생된다.In the actual vehicle state, the ventilation is opened to the throttle part, and the blow-by gas is moved through the positive crankcase ventilation (PCV) valve rather than the breather side. The warm blow-by gas leaked out through the valve meets the cold intake air introduced through the throttle body on the side of the surge tank (S / TANK) and is connected to the surge tank (S / TANK) side of the PCV nipple by the water vapor contained in the gas. Freezing occurs.

이때 더 오랜 시간이 지날수록 결빙되어지는 수증기의 양이 증가하여 결국 PCV 라인에 막혀 엔진에 치명적인 손상(BLOW-BY가스 팽창에 의한 폭발 등)을 입힐 수 있다.Over time, the amount of water vapor that freezes increases, eventually clogging up the PCV line and causing fatal damage to the engine (such as explosions caused by BLOW-BY gas expansion).

한편 도 3에는 종래의 엔진 냉각 회로도가 도시되어 있고, 도 4에는 종래의 엔진 냉각 회로에 적용된 왁스식 써모스탯의 개념도가 도시되어 있다.Meanwhile, FIG. 3 shows a conventional engine cooling circuit diagram, and FIG. 4 shows a conceptual diagram of a wax thermostat applied to a conventional engine cooling circuit.

도 3의 종래의 엔진 냉각 회로에 있어서 냉각수의 흐름을 조절하여 냉각수의 적정온도를 유지할 수 있도록 하는 왁스식 써모스탯은 수온이 낮을 때에 밸브를 닫아 라디에이터(RADIATOR)로 냉각수가 흐르지 않고 바이패스 통로로 순환하도록 하여 열의 발산을 막게 되며, 수온이 높을 때에 밸브를 열어 냉각수가 라디에이터를 순환하도록 한다.In the conventional engine cooling circuit of FIG. 3, a wax thermostat that maintains an appropriate temperature of the cooling water by adjusting the flow of the cooling water is closed by a valve when the water temperature is low, and the cooling water does not flow to the radiator. This prevents heat from dissipating and opens the valve when the water temperature is high to allow the coolant to circulate the radiator.

도 4에서 11은 피스톤, 12는 시트, 13은 엘리먼트 조립체, 14는 스프링, 15는 프레임, 16은 바이패스 스프링, 17은 바이패스 밸브, 18은 지글 밸브, 19는 메인 밸브이다.4, 11 is a piston, 12 is a seat, 13 is an element assembly, 14 is a spring, 15 is a frame, 16 is a bypass spring, 17 is a bypass valve, 18 is a sizzling valve, and 19 is a main valve.

이처럼 종래의 엔진 냉각 회로는 외부 온도에 따라 팽창율이 달라지는 왁스식 써모스탯(10)을 사용하여 왁스의 온도 특성에 따라 냉각수가 라디에이터쪽으로 순환되어 냉각되도록 구성된다.(왁스 특성에 따른 냉각수 개방 온도 : 82℃~92℃)As described above, the conventional engine cooling circuit is configured such that the cooling water is circulated to the radiator and cooled according to the temperature characteristic of the wax by using the wax type thermostat 10 whose expansion rate is changed according to the external temperature. 82 ℃ ~ 92 ℃)

이렇듯 왁스의 특성에 따라 엔진을 냉각하는 종래의 엔진 냉각 회로에 있어서는 차량 및 주행 환경이 고려되지 않은 채 특정 냉각 수온에 따라서만 엔진을 냉각하게 된다.As described above, in the conventional engine cooling circuit for cooling the engine according to the characteristics of the wax, the engine is cooled only according to the specific cooling water temperature without considering the vehicle and the driving environment.

본 발명은 상기와 같은 종래의 실정을 감안하여 안출한 것이며, 그 목적이 혹한지에서 PCV 밸브를 통하여 외부로 유출된 따뜻한 블로바이 가스가 서지탱크(S/TANK)측 스로틀 바디를 통하여 유입된 차가운 흡입 공기와 만나면서 가스내 함유된 수증기에 의하여 PCV 니플의 서지탱크(S/TANK)측에 결빙되는 것을 방지할 수 있도록 하는 엔진 결빙 방지를 위한 엔진 냉각 회로의 써모스탯 제어방법을 제공하는 데에 있는 것이다.The present invention has been devised in view of the conventional situation as described above, and the cold blowby gas flowed out through the surge tank (S / TANK) side throttle body through the PCV valve to the outside in case of severe cold The present invention provides a method of controlling the thermostat of an engine cooling circuit for preventing engine freezing, which prevents freezing on the surge tank (S / TANK) side of a PCV nipple while encountering intake air. will be.

본 발명은 상기의 목적을 달성하기 위하여 외부기온이 엔진 결빙발생온도에 해당되고 PCV 밸브측 온도가 PCV 니플측 온도보다 낮을 때에 전자식 써모스탯 개방온도를 상승시켜 엔진 온도 및 PCV 밸브측 블로바이 가스 온도를 상승시키도록 하는 것을 특징으로 한다.In order to achieve the above object, the present invention increases the electronic thermostat opening temperature when the external air temperature corresponds to the engine freezing temperature and the PCV valve side temperature is lower than the PCV nipple side temperature, thereby increasing the engine temperature and the PCV valve side blow-by gas temperature. It is characterized by increasing the.

즉, 본 발명의 엔진 결빙 방지를 위한 엔진 냉각 회로의 써모스탯 제어방법은 전자식 써모스탯으로 라디에이터의 냉각수 순환을 제어하도록 하되, 전자제어유니트(ECU)에서 외부기온이 설정된 결빙발생온도(예를 들면 -30℃)인가를 판단하여 결빙발생온도이면 PCV측의 밸브 온도가 니플 온도보다 낮은가를 판단하고, PCV측의 밸브 온도가 니플 온도보다 낮아 PCV 니플에 결빙이 감지된 경우 혹한기 운전조건으로 전환하여 전자식 써모스탯 개방온도(예를 들면 82℃~92℃)를 상승시켜 엔진 냉각 회로를 구동하도록 하여서 되는 것이다.That is, the thermostat control method of the engine cooling circuit for preventing engine freezing of the present invention is to control the cooling water circulation of the radiator with an electronic thermostat, the external temperature is set in the electronic control unit (ECU) frost generation temperature (for example -30 ℃), it is determined that the temperature of the PCV valve is lower than the nipple temperature if the temperature of the freezing occurs, and if the PCV nipple detects freezing because the valve temperature of the PCV valve is lower than the temperature of the nipple, it switches to the cold operation condition. The electronic thermostat opening temperature (for example, 82 degreeC-92 degreeC) is raised to drive an engine cooling circuit.

본 발명에 있어서 전자식 써모스탯이 혹한기 운전조건으로 전환되어 전자식 써모스탯 개방온도가 상승되면 엔진 온도가 동반 상승하게 되고, PCV 밸브측 블로바이 가스 온도가 상승하게 되며, 그에 따라 PCV 니플측에 따뜻한 블로바이 가스가 공급되므로 PCV 니플의 결빙을 방지할 수 있게 된다.In the present invention, when the electronic thermostat is switched to the cold weather operating conditions and the electronic thermostat opening temperature is increased, the engine temperature is increased together, and the PCV valve side blow-by gas temperature is increased, and thus the warm blow on the PCV nipple side. Bi-gas is supplied to prevent freezing of the PCV nipple.

본 발명에 있어서 외부기온이 설정된 결빙발생온도보다 높거나 PCV 밸브 온도가 PCV 니플 온도보다 높으면 전자식 써모스탯 개방온도를 상승시키지 않는 일반운전조건으로 엔진 냉각 회로를 구동하게 된다.In the present invention, when the external air temperature is higher than the set ice generation temperature or the PCV valve temperature is higher than the PCV nipple temperature, the engine cooling circuit is driven in a general operation condition which does not increase the electronic thermostat opening temperature.

본 발명에 있어서는 외부기온이 엔진 결빙발생온도에 해당되고 PCV 밸브측 온도가 PCV 니플측 온도보다 낮을 때에 전자식 써모스탯 개방온도를 상승시킴으로써 엔진 온도와 PCV 밸브를 통하여 나가는 블로바이 가스 온도를 상승시켜 PCV 니플측 발생하는 결빙물을 녹이고 엔진 결빙을 방지하게 된다.In the present invention, when the external air temperature corresponds to the engine freezing temperature and the PCV valve side temperature is lower than the PCV nipple side temperature, the electronic thermostat opening temperature is increased to increase the engine temperature and the blow-by gas exiting through the PCV valve to increase the PCV. The nipple side melts frost and prevents engine icing.

따라서 본 발명에 의하면 혹한지에서 엔진 결빙에 의한 손상을 방지할 수 있게 되어 차량의 안전성 및 상품성을 크게 향상시킬 수 있게 되는 등의 효과를 얻을 수 있게 된다.Therefore, according to the present invention, it is possible to prevent damage caused by the engine freezing in cold weather, and thus, it is possible to obtain an effect of greatly improving the safety and the merchandise of the vehicle.

이하 본 발명의 구체적인 기술내용을 첨부도면에 의거하여 더욱 자세히 설명하면 다음과 같다.Hereinafter, the specific technical details of the present invention will be described in more detail with reference to the accompanying drawings.

도 5에는 본 발명의 한 실시예의 전자식 써모스탯 제어 흐름도가 도시되어 있고, 도 6에는 동 실시예의 엔진 냉각 회로도가 도시되어 있다.5 shows an electronic thermostat control flow diagram of one embodiment of the invention, and FIG. 6 shows an engine cooling circuit diagram of the embodiment.

본 발명의 엔진 결빙 방지를 위한 엔진 냉각 회로의 써모스탯 제어방법은 전자식 써모스탯으로 라디에이터의 냉각수 순환을 제어하도록 하되, 전자제어유니트(ECU)에서 외부기온이 설정된 결빙발생온도(예를 들면 -30℃)인가를 판단하여 결빙발생온도이면 PCV측의 밸브 온도가 니플 온도보다 낮은가를 판단하고, PCV측의 밸브 온도가 니플 온도보다 낮아 PCV 니플에 결빙이 감지된 경우 혹한기 운전조건으로 전환하여 전자식 써모스탯 개방온도(예를 들면 82℃~92℃)를 상승시켜 엔진 냉각 회로를 구동하도록 한 것이다.Thermostat control method of the engine cooling circuit for preventing engine icing of the present invention is to control the cooling water circulation of the radiator with an electronic thermostat, the frost generation temperature (ex. -30) the external temperature is set in the electronic control unit (ECU) ℃) is judged whether the temperature of the PCV side valve is lower than the nipple temperature if the temperature of the freezing occurs, and if the PCV nipple is detected because the valve temperature of the PCV side is lower than the nipple temperature, switch to the cold weather operating conditions The stat opening temperature (for example, 82 ℃ ~ 92 ℃) was raised to drive the engine cooling circuit.

본 발명에 있어서 전자식 써모스탯이 혹한기 운전조건으로 전환되어 전자식 써모스탯 개방온도가 상승되면 엔진 온도가 동반 상승하게 되고, PCV 밸브측 블로바이 가스 온도가 상승하게 되며, 그에 따라 PCV 니플측에 따뜻한 블로바이 가스가 공급되므로 PCV 니플의 결빙을 방지할 수 있게 된다.In the present invention, when the electronic thermostat is switched to the cold weather operating conditions and the electronic thermostat opening temperature is increased, the engine temperature is increased together, and the PCV valve side blow-by gas temperature is increased, and thus the warm blow on the PCV nipple side. Bi-gas is supplied to prevent freezing of the PCV nipple.

본 발명에 있어서 외부기온이 설정된 결빙발생온도보다 높거나 PCV 밸브 온도가 PCV 니플 온도보다 높으면 전자식 써모스탯 개방온도를 상승시키지 않는 일반운전조건으로 엔진 냉각 회로를 구동하게 된다.In the present invention, when the external air temperature is higher than the set ice generation temperature or the PCV valve temperature is higher than the PCV nipple temperature, the engine cooling circuit is driven in a general operation condition which does not increase the electronic thermostat opening temperature.

본 발명에 있어서 결빙발생온도 및 혹한기 운전조건의 전자식 써모스탯 개방온도는 각 지역의 실정에 맞게끔 조절할 수 있게 됨은 물론이다.In the present invention, the electronic thermostat opening temperature of the freezing generation temperature and cold operation conditions can be adjusted to suit the actual situation of each region.

본 발명은 기존 전자제어 써모스탯을 이용한 엔진 냉각 회로와 동일한 엔진 냉각 회로를 사용하며, 전자식 써모스탯 및 전자제어유니트이 제어로직, 그리고 PCV 밸브 및 니플 온도 측정으로 혹한지 엔진 결빙 방지를 구현하게 된다.The present invention uses the same engine cooling circuit as the engine cooling circuit using the conventional electronically controlled thermostat, and the electronic thermostat and the electronic control unit implement the control logic and the PCV valve and nipple temperature measurement to prevent the engine freezing.

본 발명에 있어서 엔진 결빙 발생시 1차 대책점은 서지탱크(S/TANK)측 PCV 니플측으로, PCV 밸브를 통하여 나가는 블로바이 가스 온도를 상승시켜 PCV 니플측 발생한 결빙물을 녹여 엔진 결빙을 방지하게 된다.In the present invention, when the engine ice occurs, the primary countermeasure is the surge tank (S / TANK) side of the PCV nipple side to increase the blow-by gas temperature exiting through the PCV valve to melt the ice generated on the PCV nipple side to prevent engine freezing. .

참고적으로 차량 주행 조건에서의 엔진내 블로바이 가스(BLOW-BY GAS)의 흐름을 살펴보면 엔진내 블로바이 가스는 PCV 밸브에서 PCV 니플을 통하여 서지탱크(S/TANK) 내측으로 새로운 공기와 혼합되어 다시 엔진 연소실측으로 유입되며, 이 때 브리더(BREATHER) 라인으로는 외부의 새로운 공기가 엔진 내측으로 유입된 다.For reference, the flow of the blow-by gas in the engine under vehicle driving conditions is that the blow-by gas in the engine is mixed with fresh air from the PCV valve through the PCV nipple into the surge tank (S / TANK). It is flowed back into the engine combustion chamber, and fresh air is introduced into the engine through the breather line.

이와 같은 블로바이 가스(BLOW-BY GAS)의 흐름으로 인하여 정상 상태에서는 PCV 밸브측 온도가 PCV 니플측 온도보다 높게 된다.Due to the flow of the blow-by gas, the PCV valve side temperature becomes higher than the PCV nipple side temperature in a normal state.

차량 운행 조건중 엔진의 1차 결빙은 따뜻한 블로바이 가스(BLOW-BY GAS)와 차가운 새로운 공기가 만나는 PCV 니플 부위(S/TANK측)에서 발생된다.The primary icing of the engine during vehicle operation occurs at the PCV nipple (S / TANK side) where the warm blow-by gas meets the cool new air.

즉, 블로바이 가스내의 수분이 차가운 외부 새로운 공기와 만나 응축되면서 PCV 니플 부위에 결빙생성물 발생되며, 결빙에 의하여 PCV 니플이 막히게 될 경우 PCV 밸브를 통하여 블로바이 가스(BLOW-BY GAS) 배출이 불가능해지게 되고, 외부의 새로운 공기를 받아들이던 브리더(BREATHER) 라인을 통하여 블로바이 가스가 배출된다.That is, moisture in the blow-by gas condenses with cold outside air, causing freezing to occur at the PCV nipple, and if the PCV nipple is blocked by freezing, blow-by gas cannot be discharged through the PCV valve. The blow-by gas is discharged through a breather line that receives fresh air from the outside.

도 7에는 결빙 미발생 정상 주행조건과 결빙 발생 조건하에서의 PCV 밸브 및 PCV 니플 온도 변화 그래프가 도시되어 있는 바, 전술한 바와 같이 정상 주행 조건에서는 PCV 밸브측 온도가 PCV 니플측 온도보다 높게 되지만 결빙 발생시에는 PCV 밸브측 온도가 PCV 니플측 온도보다 낮게 되어 정상 주행 조건 대비하여 온도 역전현상이 발생하게 된다.7 shows a graph of PCV valve and PCV nipple temperature changes under normal running conditions and freezing conditions without freezing. As described above, the PCV valve side temperature is higher than the PCV nipple side temperature under normal running conditions. In this case, the PCV valve side temperature is lower than the PCV nipple side temperature, resulting in a temperature reversal phenomenon compared to the normal driving conditions.

본 발명은 외부기온이 엔진 결빙발생온도에 해당되고 PCV 밸브측 온도가 PCV 니플측 온도보다 낮을 때에 전자식 써모스탯 개방온도를 상승시킴으로써 엔진의 고온 열기를 이용하여 결빙 생성을 방지하게 된다.According to the present invention, when the external air temperature corresponds to the engine freezing generation temperature and the PCV valve side temperature is lower than the PCV nipple side temperature, the electronic thermostat opening temperature is increased to prevent the formation of freezing by using the high temperature heat of the engine.

본 발명에 있어서 혹한지 운전 조건에서 써모스탯 개방 온도는 일반 운전 조건의 82℃~92℃보다 10℃ 정도 높은 92℃~102℃로 할 수 있지만 이에 한정하지는 않는다.In the present invention, the thermostat opening temperature may be 92 ° C. to 102 ° C., which is about 10 ° C. higher than 82 ° C. to 92 ° C. under normal operating conditions, but is not limited thereto.

도 8에는 본 발명의 전자식 써모스탯 개방온도 상승에 따른 PCV 밸브 및 PCV 니플 온도변화 시험 그래프가 도시되어 있다.FIG. 8 is a graph illustrating a test result of a PCV valve and a PCV nipple temperature change according to an increase in the electronic thermostat opening temperature of the present invention.

도 8에서 ①은 전자식 써모스탯의 개방온도를 82℃에서 시작한 경우 엔진측 PCV 밸브 및 PCV 니플측 온도를 나타내며, ②는 전자식 써모스탯의 개방온도를 92℃에서 시작한 경우 엔진측 PCV 밸브 및 PCV 니플측 온도를 나타낸다.In Fig. 8, ① indicates the engine side PCV valve and PCV nipple side temperature when the opening temperature of the electronic thermostat starts at 82 ° C, and ② indicates the engine side PCV valve and PCV nipple when the opening temperature of the electronic thermostat starts at 92 ° C. Indicates side temperature.

도 8과 같이 전자식 써모스탯 개방온도를 10℃ 정도 올릴 경우 PCV 밸브측으로 나가는 블로바이 가스온도는 약 10℃ 정도 상승 효과가 있으며, 이는 결빙 취약 부위인 PCV 니플의 서지탱크측 온도를 상승시키는 결과를 보여주고 있다.As shown in FIG. 8, when the electronic thermostat opening temperature is increased by about 10 ° C., the blow-by gas temperature exiting to the PCV valve side has an effect of about 10 ° C., which increases the surge tank side temperature of the PCV nipple, which is a weak part of freezing. Is showing.

도 1은 차량 벤틸레이션 시스템의 개략 구성도1 is a schematic configuration diagram of a vehicle ventilation system

도 2는 동 벤틸레이션 시스템의 PCV 니플의 종단면도2 is a longitudinal cross-sectional view of the PCV nipple of the same ventilation system.

도 3은 종래의 엔진 냉각 회로도3 is a conventional engine cooling circuit diagram

도 4는 종래의 엔진 냉각 회로에 적용된 왁스식 써모스탯의 개념도4 is a conceptual diagram of a wax-type thermostat applied to a conventional engine cooling circuit

도 5는 본 발명의 한 실시예의 전자식 써모스탯 제어 흐름도5 is an electronic thermostat control flowchart of an embodiment of the present invention.

도 6은 동 실시예의 엔진 냉각 회로도6 is an engine cooling circuit diagram of the embodiment;

도 7은 결빙 미발생 정상 주행조건과 결빙 발생 조건하에서의 PCV 밸브 및 PCV 니플 온도 변화 그래프7 is a graph showing changes in PCV valves and PCV nipples under normal running conditions without freezing and under freezing conditions.

도 8에는 본 발명의 전자식 써모스탯 개방온도 상승에 따른 PCV 밸브 및 PCV 니플 온도변화 시험 그래프8 is a test graph of the PCV valve and PCV nipple temperature change according to the increase in the electronic thermostat opening temperature of the present invention

Claims (3)

전자식 써모스탯으로 라디에이터의 냉각수 순환을 제어하도록 하되, 전자제어유니트(ECU)에서 외부기온이 설정된 결빙발생온도인가를 판단하여 결빙발생온도이면 PCV측의 밸브 온도가 니플 온도보다 낮은가를 판단하고, PCV측의 밸브 온도가 니플 온도보다 낮아 PCV 니플에 결빙이 감지된 경우 혹한기 운전조건으로 전환하여 전자식 써모스탯 개방온도를 상승시켜 엔진 냉각 회로를 구동하도록 한 것을 특징으로 하는 엔진 결빙 방지를 위한 엔진 냉각 회로의 써모스탯 제어방법.An electronic thermostat controls the cooling water circulation of the radiator, and determines whether the external air temperature is set to the set ice formation temperature in the electronic control unit (ECU), and if it is the freezing temperature, it is determined whether the valve temperature on the PCV side is lower than the nipple temperature. If the valve temperature on the side is lower than the nipple temperature and the icing is detected in the PCV nipple, the engine cooling circuit for preventing engine icing is characterized in that the engine cooling circuit is driven by increasing the electronic thermostat opening temperature by switching to the cold operating condition. Thermostat control method. 제1항에 있어서, 외부기온이 설정된 결빙발생온도보다 높거나 PCV 밸브 온도가 PCV 니플 온도보다 높으면 전자식 써모스탯 개방온도를 상승시키지 않는 일반운전조건으로 엔진 냉각 회로를 구동하는 것을 특징으로 하는 엔진 결빙 방지를 위한 엔진 냉각 회로의 써모스탯 제어방법.The engine icing circuit of claim 1, wherein the engine cooling circuit is driven under a general operation condition in which the electronic thermostat opening temperature is not increased when the external temperature is higher than the set icing temperature or the PCV valve temperature is higher than the PCV nipple temperature. Thermostat control method of engine cooling circuit for protection. 제1항 또는 제2항에 있어서, 혹한지 운전 조건에서 써모스탯 개방 온도는 일반 운전 조건의 82℃~92℃보다 높은 92℃~102℃로 하는 것을 특징으로 하는 엔진 결빙 방지를 위한 엔진 냉각 회로의 써모스탯 제어방법.The engine cooling circuit according to claim 1 or 2, wherein the thermostat opening temperature is set at 92 ° C to 102 ° C, which is higher than 82 ° C to 92 ° C of normal operating conditions in cold operating conditions. Thermostat control method.
KR1020070122053A 2007-11-28 2007-11-28 A thermostat control method for preventing engine frozen KR20090055232A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102691548A (en) * 2011-03-21 2012-09-26 通用汽车环球科技运作有限责任公司 System and method for preventing icing in positive crankcase ventilation systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102691548A (en) * 2011-03-21 2012-09-26 通用汽车环球科技运作有限责任公司 System and method for preventing icing in positive crankcase ventilation systems

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