KR20010063122A - Method for diagnosing thermostat of engine cooling system for a motor vehicle - Google Patents

Method for diagnosing thermostat of engine cooling system for a motor vehicle

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Publication number
KR20010063122A
KR20010063122A KR1019990059999A KR19990059999A KR20010063122A KR 20010063122 A KR20010063122 A KR 20010063122A KR 1019990059999 A KR1019990059999 A KR 1019990059999A KR 19990059999 A KR19990059999 A KR 19990059999A KR 20010063122 A KR20010063122 A KR 20010063122A
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KR
South Korea
Prior art keywords
cooling water
thermostat
temperature
water temperature
engine
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KR1019990059999A
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Korean (ko)
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KR100337512B1 (en
Inventor
채승진
Original Assignee
류정열
기아자동차주식회사
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Priority to KR1019990059999A priority Critical patent/KR100337512B1/en
Publication of KR20010063122A publication Critical patent/KR20010063122A/en
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Publication of KR100337512B1 publication Critical patent/KR100337512B1/en

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Classifications

    • 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
    • F01P11/18—Indicating devices; Other safety devices concerning coolant pressure, coolant flow, or liquid-coolant level
    • 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
    • F01P2025/50—Temperature using two or more temperature sensors
    • 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
    • F01P2031/00—Fail safe
    • F01P2031/20—Warning devices
    • 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
    • F01P2070/00—Details
    • F01P2070/10—Details using electrical or electromechanical means
    • 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
    • F01P7/161—Controlling of coolant flow the coolant being liquid by thermostatic control by bypassing pumps
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/02—Control of temperature without auxiliary power with sensing element expanding and contracting in response to changes of temperature

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

PURPOSE: A diagnosing method of a thermostat is provided to keep thermal efficiency of an engine regularly regardless of combustion heat by alarming a driver of an abnormal thermostat. CONSTITUTION: A first engine oil temperature(T1) is detected from a first temperature sensor(S1). The T1 is one of the engine oil flowing to a thermostat through an oil passage of a water jacket. The changes(delta-T2) of a second engine oil temperature(T2) are detected(S2). If the T1 is lower than opening temperature(T0), the delta-T2 is compared with first reference value(Tr1)(S4). If the delta-T2 is larger than the Tr1, the thermostat is opened at a lower temperature than the T0. An alarm device is operated to warn a driver of the delta-T2 lower than the Tr1(S5). If the T1 is not lower than the T0, the T1 is compared with the T0(S6). If the T1 is higher than the T0, the delta-T2 is compared with second reference value(Tr2)(S7). If the thermostat is not opened at the T0, the engine oil of the water jacket does not flow inT0 a radiaT0r. Thereby, the T2 does not rise up and the thermostat is not opened at the T0. If the delta-T2 is lower than the Tr2, the thermostat is not opened at a higher temperature than the T0. The engine oil circulates T0 the radiaT0r through a bypass pipe opened by an actuaT0r. Therefore, the engine is prevented from overheating.

Description

차량용 엔진냉각장치의 서모스탯 고장진단방법{Method for diagnosing thermostat of engine cooling system for a motor vehicle}Method for diagnosing thermostat failure of vehicle cooling system {Method for diagnosing thermostat of engine cooling system for a motor vehicle}

본 발명은 구동시 많은 열이 발생되는 차량용 엔진을 냉각시키기 위한 장치에 관한 것으로, 보다 상세하게는 냉각수의 순환을 제어하는 서모스탯(thermostat)의 고장을 진단하는 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cooling a vehicle engine, in which a large amount of heat is generated during driving, and more particularly, to a method for diagnosing a failure of a thermostat controlling the circulation of cooling water.

차량용 엔진의 실린더에 형성된 연소실에서 발생되는 연소가스의 온도는 대략 2,000℃ 이상이며, 이 열의 상당량이 실린더와 실린더 헤드, 피스톤, 및 밸브 등으로 전달된다. 이와 같이 엔진 구성 부품으로 연소가스의 열이 전달되는 것에 의해, 엔진 구성 부품의 온도가 과도하게 상승되면, 부품의 열변형이 일어나거나 실린더 벽의 윤활 불량에 따른 중대한 열적 장해가 발생된다. 또한, 연소 상태도 나빠지고, 노크 또는 조기 점화와 같은 이상 연소로 인해 엔진의 출력이 저하될 뿐만 아니라 피스톤의 용손과 같은 부품의 손상이 발생된다.The temperature of the combustion gas generated in the combustion chamber formed in the cylinder of the vehicle engine is approximately 2,000 ° C. or more, and a substantial amount of this heat is transferred to the cylinder, the cylinder head, the piston, the valve, and the like. As the heat of the combustion gas is transferred to the engine components in this way, excessively high temperatures of the engine components cause thermal deformation of the components or serious thermal disturbances due to poor lubrication of the cylinder walls. In addition, the combustion condition worsens, and abnormal combustion, such as knocking or premature ignition, causes not only the output of the engine to be lowered, but also damage to parts such as a piston loss.

따라서, 차량에는 엔진의 작동시 연소가스에 의해 발생된 열을 냉각시키기 위한 냉각 장치가 필수적으로 구비되어 있다. 이러한 냉각 장치는 공기를 이용한 공냉식과 물을 이용한 수냉식으로 크게 구분되는 바, 4행정 내연기관을 채택한 차량은 거의 대부분 수냉식 엔진 냉각장치를 사용하고 있다.Therefore, the vehicle is essentially provided with a cooling device for cooling the heat generated by the combustion gas during the operation of the engine. These cooling devices are largely divided into air-cooled air and water-cooled water. Most vehicles employing a four-stroke internal combustion engine use water-cooled engine coolers.

도 1은 일반적인 수냉식 엔진 냉각 장치의 일 예를 보인 것이다.1 shows an example of a general water-cooled engine cooling device.

도면에 도시된 바와 같이, 수냉식 엔진 냉각장치는 연소실이 형성된 엔진의 실린더 및 실린더 헤드(이하, 엔진(1)로 통칭함)를 둘러싸고 있는 뤄터재킷(2), 냉각수를 압송하기 위한 워터펌프(3), 냉각수를 외기와 열교환시키기 위한 라디에이터(4), 냉각수의 온도에 따라 작동되며 라디에이터(4)의 열교환 작용을 촉진시키기 위한 냉각팬(5), 및 워터재킷(2)과 라디에이터(4) 사이에 설치된 서모스탯(thermostat)(6)을 포함하고 있다.As shown in the figure, the water-cooled engine cooler includes a router jacket 2 surrounding a cylinder and a cylinder head (hereinafter collectively referred to as engine 1) of an engine in which a combustion chamber is formed, and a water pump 3 for pumping cooling water. ), A radiator (4) for exchanging coolant with the outside air, a cooling fan (5) operated according to the temperature of the coolant and promoting heat exchange of the radiator (4), and between the water jacket (2) and the radiator (4). It contains a thermostat (6) installed on it.

워터재킷(2)에는 냉각수가 순환되는 통로가 형성되어 있으며, 이 냉각수 통로는 라디에이터(4)와 연결되어 있고, 그 중간 일측에 워터펌프(3)가 설치되어 있다. 또한, 워터재킷의 냉각수 통로 일측에는 순환되는 냉각수의 온도를 검출하기 위한 냉각수온 센서(9)가 설치되어 있다.The water jacket 2 is provided with a passage through which cooling water is circulated, and the cooling water passage is connected to the radiator 4, and a water pump 3 is provided at one side thereof. In addition, one side of the cooling water passage of the water jacket is provided with a cooling water temperature sensor 9 for detecting the temperature of the cooling water circulated.

이에 따라 워터펌프(3)가 작동되면, 냉각수가 워터재킷(2)의 냉각수 통로를 따라 순환되면서 엔진(1)으로 전달된 연소가스의 열을 흡수하여 엔진(1)을 냉각시킨다. 엔진(1)의 열을 흡수하여 그 온도가 상승된 냉각수는 라디에이터(4)로 순환되고, 라디에이터(4)에서 외기와 열교환되어 냉각된다. 라디에이터(4)에서 냉각된 냉각수는 다시 워터펌프(3)에 의해 워터재킷(2)으로 압송되어 엔진(1)을 냉각시키게 된다. 이때, 냉각수온 센서(9)에서 검출되는 냉각수온이 소정치 이상 상승되면 라디에이터(4)에서의 냉각수의 열교환이 촉진되도록 냉각팬(5)이 구동된다.Accordingly, when the water pump 3 is operated, cooling water is circulated along the cooling water passage of the water jacket 2 to absorb heat of the combustion gas delivered to the engine 1 to cool the engine 1. Cooling water whose heat is absorbed by the engine 1 and whose temperature is raised is circulated to the radiator 4, and is cooled by heat exchange with outside air in the radiator 4. The coolant cooled in the radiator 4 is again pumped by the water pump 3 to the water jacket 2 to cool the engine 1. At this time, when the cooling water temperature detected by the cooling water temperature sensor 9 rises by a predetermined value or more, the cooling fan 5 is driven to promote heat exchange of the cooling water in the radiator 4.

그러나, 엔진(1)이 지나치게 냉각되면 연소에서 발생된 열량 중에서 냉각에 의해 손실되는 열량이 커, 엔진(1)의 열효율이 낮아지고 연료소비량이 증가되는 등의 문제가 발생된다.However, if the engine 1 is excessively cooled, the amount of heat lost by cooling is greater among the heat generated from combustion, resulting in lowered thermal efficiency of the engine 1 and increased fuel consumption.

이를 방지하기 위해, 워터재킷(2)과 라디에이터(4) 사이에 설치된 서모스탯(6)이 냉각수온에 따라 냉각수의 순환을 제어함으로써 냉각수의 온도를 일정하게 유지한다. 서모스탯(6)은 통상적으로 워터재킷(2)의 냉각수 통로의 출구측에 설치되어 있으며, 워터재킷(2)으로부터 유출되는 냉각수의 온도가 소정온도(통상적으로 80~90℃) 이하로 떨어지면 폐쇄되어, 냉각수 통로를 폐쇄함으로써 냉각수가 워터재킷(2)의 냉각수 통로를 통해 순환하는 것을 방지한다. 이 경우, 워터펌프(3)는 정지되거나, 그렇지 않으면 워터펌프(3)에 의해 압송되는 냉각수가워터재킷(2)으로 순환되지 않고 별도의 통로를 통해 워터펌프(3)로부터 라디에이터(4)의 입구측으로 바이패스된다.To prevent this, the thermostat 6 provided between the water jacket 2 and the radiator 4 maintains the temperature of the cooling water constant by controlling the circulation of the cooling water according to the cooling water temperature. The thermostat 6 is normally installed at the outlet side of the cooling water passage of the water jacket 2, and is closed when the temperature of the cooling water flowing out of the water jacket 2 falls below a predetermined temperature (typically 80 to 90 ° C). By closing the cooling water passage, the cooling water is prevented from circulating through the cooling water passage of the water jacket 2. In this case, the water pump 3 is stopped or otherwise the cooling water pumped by the water pump 3 is not circulated to the water jacket 2 but through the separate passage of the radiator 4. Bypass to the inlet side.

그런데, 이러한 차량용 엔진냉각장치에 있어서, 서모스탯(6)이 고장날 경우 다음과 같은 문제점이 발생될 수 있다.However, in such a vehicle engine cooling device, when the thermostat 6 is broken, the following problems may occur.

즉, 서모스탯이 고장나 개방 온도 이상이 되어도 닫힌 상태를 유지할 경우, 엔진으로부터 발생되는 열에 의해 데워진 워터 재킷 내부의 냉각수가 냉각되지 않게 되어 엔진이 과열되므로, 실린더가 변형되거나 실린더의 유막이 파괴되어 윤활 불량이 발생된다. 또한, 과열된 냉각수가 수증기로 변화되어 라디에이터 내부의 압력을 상승시키게 되므로, 상승된 압력에 의해 주행중 라디에에이터 캡으로부터 수증기가 급격하게 토출되는 현상이 발생된다.In other words, if the thermostat remains closed even if the thermostat fails or exceeds the opening temperature, the coolant inside the water jacket warmed by the heat generated from the engine will not cool and the engine will overheat. Poor lubrication occurs. In addition, since the superheated cooling water is changed to water vapor to increase the pressure inside the radiator, a phenomenon in which water vapor is rapidly discharged from the radiator cap while driving is caused by the elevated pressure.

다른 한편으로, 서모스탯이 개방 온도 이하에서도 계속 개방된 상태로 유지될 경우, 냉각수가 계속 라디에이터를 거쳐 냉각되므로 연소에 의해 생긴 열이 냉각에 의해 상실되어 엔진의 열효율이 저하된다.On the other hand, when the thermostat is kept open even below the opening temperature, since the coolant continues to cool through the radiator, the heat generated by the combustion is lost by the cooling, which lowers the thermal efficiency of the engine.

본 발명은 상기와 같은 문제점을 해결하기 위해 안출된 것으로, 서모스탯의 고장을 진단하여 운전자에게 경고함으로써 상술한 문제점을 예방할 수 있는 차량용 엔진냉각장치의 서모스탯 고장진단방법을 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, the object of the present invention is to provide a method for diagnosing a thermostat failure of an engine cooling device for a vehicle that can prevent the above problems by diagnosing a failure of the thermostat and warning the driver. .

도 1은 차량용 엔진 냉각 장치의 구성을 개략적으로 보인 도면.1 is a view schematically showing the configuration of a vehicle engine cooling device;

도 2는 본 발명의 일 실시예에 따른 서모스탯 고장진단방법을 수행하기 위한 구성을 가지는 차량용 엔진 냉각 장치의 구성을 개략적으로 보인 도면.Figure 2 is a schematic view showing the configuration of a vehicle engine cooling apparatus having a configuration for performing a thermostat failure diagnosis method according to an embodiment of the present invention.

도 3은 본 발명의 일 실시예에 따른 차량용 엔진 냉각 장치의 서모스탯 고장 진단 방법을 설명하기 위한 흐름도.Figure 3 is a flow chart for explaining a thermostat failure diagnosis method of the vehicle engine cooling apparatus according to an embodiment of the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1 ; 엔진 2 ; 워터 재킷One ; Engine 2; Water jacket

4 ; 라디에이터 6 ; 서모스탯4 ; Radiator 6; Thermostat

9 ; 제 1 냉각수온 센서 10 ; 제 2 냉각수온 센서9; First cooling water temperature sensor 10; 2nd coolant temperature sensor

11 ; 바이패스관11; Bypass tube

상기와 같은 목적은, 워터 재킷의 내부에 설치된 제 1 냉각 수온 센서 및 라디에이터의 냉각수 통로에 설치된 제 2 냉각 수온 센서로부터 각각 제 1냉각수온(T1) 및 제 2 냉각수온의 변화율(ΛT2)을 검출하는 단계; 제 1 냉각수온(T1)을 개방 온도(To)와 비교하고, 제 1 냉각수온이 개방 온도(To)보다 낮을 경우에는 제 2 냉각수온의 변화율(ΛT2)과 제 1 기준치(Tr1)를 비교하여 제 2 냉각수온의 변화율(ΛT2)이 제 1 기준치(Tr1) 보다 크면 서모스탯이 고장인 것으로 판단하며, 제 1 냉각수온(T1)이 개방 온도(To)보다 높을 경우에는 제 2 냉각수온의 변화율(ΛT2)과 제 2 기준치(Tr2)를 비교하여 제 2 냉각수온의 변화율(ΛT2)이 제 2 기준치(Tr2) 보다 작으면 서모스탯이 고장인 것으로 판단하는 단계; 및 단계에서 서모스탯이 고장인 것으로 판단되면 경보 장치를 작동시켜 운전자에게 경고하는 단계를 포함하는 본 발명에 따른 차량용 엔진냉각장치의 서모스탯 고장진단방법에 의해 달성된다.The above object is the rate of change of the first cooling water temperature T 1 and the second cooling water temperature ΛT 2 from the first cooling water temperature sensor installed in the water jacket and the second cooling water temperature sensor installed in the cooling water passage of the radiator, respectively. Detecting; The first cooling water temperature (T 1 ) is compared with the opening temperature (T o ), and when the first cooling water temperature is lower than the opening temperature (T o ), the rate of change (ΛT 2 ) and the first reference value (T) of the second cooling water temperature (T o ). By comparing r1 ), if the change rate ΛT 2 of the second cooling water temperature is greater than the first reference value T r1 , it is determined that the thermostat is broken, and the first cooling water temperature T 1 is greater than the opening temperature T o . when high, is less than the second rate of change of cooling water temperature (ΛT 2) and the second reference value (T r2) for the rate of change (ΛT 2) the second reference value (T r2) of the second cooling water temperature as compared to a thermostat failure Judging by; And if it is determined that the thermostat is a failure in the step is achieved by the thermostat failure diagnosis method of the vehicle engine cooling apparatus according to the invention comprising operating a warning device to warn the driver.

바람직하게는, 서모스탯의 고장을 판단하는 단계에서 제 1 냉각수온(T1)이 개방 온도(To)보다 높고 제 2 냉각수온의 변화율(ΛT2)이 제 2 기준치(Tr2) 보다 클 경우에는 경고 단계와 함께 서모스탯을 거치지 않고 별도의 바이패스관을 통해 워터 재킷의 냉각수를 라디에이터로 바이패스시키는 단계를 실시한다.Preferably, in the step of determining the failure of the thermostat, the first cooling water temperature (T 1 ) is higher than the opening temperature (T o ) and the rate of change (ΛT 2 ) of the second cooling water temperature is larger than the second reference value (T r2 ). In the case of a warning step and bypassing the thermostat, bypassing the water jacket's coolant to the radiator through a separate bypass pipe.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

도 2는 본 발명의 일 실시예에 따른 서모스탯 고장진단방법을 수행하기 위한 구성을 가지는 차량용 엔진냉각장치를 개략적으로 도시한 구성도이고, 도 3은 본 발명의 일 실시예에 따른 서모스탯 고장진단방법의 흐름도다.Figure 2 is a schematic diagram showing a vehicle engine cooling apparatus having a configuration for performing a thermostat failure diagnosis method according to an embodiment of the present invention, Figure 3 is a thermostat failure according to an embodiment of the present invention This is a flow chart of the diagnostic method.

도 2에 도시된 바와 같이, 본 발명의 일 실시예에 따른 서모스탯 고장 진단 방법을 수행하기 위해, 워터 재킷(2)의 서모스탯(6)에 인접한 위치에 제 1 냉각수온 센서(9)가 설치되고, 라디에이터(4)의 서모스탯(6)에 인접한 일측에는 제 2 냉각 수온 센서(10)가 설치된다. 또한, 워터 재킷(2)과 라디에이터(4) 사이에 바이패스관(11)이 설치되어 있으며, 이 바이패스관(11)은 액츄에이터(12)로 구동되는 밸브(13)에 의해 개폐된다.As shown in FIG. 2, in order to perform a method for diagnosing a thermostat failure according to an embodiment of the present invention, a first cooling water temperature sensor 9 is provided at a position adjacent to the thermostat 6 of the water jacket 2. The second cooling water temperature sensor 10 is installed at one side adjacent to the thermostat 6 of the radiator 4. In addition, a bypass pipe 11 is provided between the water jacket 2 and the radiator 4, and the bypass pipe 11 is opened and closed by a valve 13 driven by the actuator 12.

한편, 도 3을 참조하여 본 발명에 따른 서모스탯 고장 진단 방법을 설명한다.Meanwhile, a thermostat failure diagnosis method according to the present invention will be described with reference to FIG. 3.

우선, 제 1 냉각수온 센서(9)로부터 제 1 냉각수온(T1)을 검출한다(S1). 여기서, 제 1 냉각수온은 워터재킷(2)의 냉각수 통로를 순환하고 서모스탯(6)으로 유입되는 냉각수의 온도다. 그리고, 제 2 냉각수온(T2)의 변화량(ΛT2)을 검출한다(S2). 여기서, 제 2 냉각수온(T2)은 서모스탯(6)을 통과하여 라디에이터(4)로 유출되는 냉각수의 온도며, ΛT2는 제 2 냉각수온 센서(10)로부터 검출된 제 2 냉각수온(T2)의 소정 시간 동안의 변화량이다.First, the first cooling water temperature T 1 is detected from the first cooling water temperature sensor 9 (S1). Here, the first cooling water temperature is the temperature of the cooling water circulated in the cooling water passage of the water jacket 2 and introduced into the thermostat 6. Then, the change amount ΛT 2 of the second cooling water temperature T 2 is detected (S2). Here, the second cooling water temperature (T 2) are said temperature of the cooling water flowing out of the radiator (4) through the thermostat (6), ΛT 2 is turned on a second cooling water detected by the second cooling water temperature sensor 10 ( T 2 ) is a change amount during a predetermined time.

다음으로, 제 1 냉각수온(T1)과 서모스탯(6)의 개방온도(To)를비교한다(S3).Next, the opening temperature T o of the first cooling water temperature T 1 and the thermostat 6 is compared (S3).

S3단계에서 제 1 냉각수온(T1)이 개방온도(To) 보다 낮은 경우에는, 제 2 냉각수온의 변화량(ΛT2)와 제 1 기준치(Tr1)를 비교한다(S4). 즉, 서모스탯(6)이 고장나 개방온도(To)보다 낮은 온도에서 열리게 되면 워터재킷(2)으로부터 유입되는 데워진 냉각수가 라디에이터(4)의 냉각수와 혼합되어 라디에이터(4)의 냉각수온, 즉 제 2 냉각수온(T2)이 상승되기 때문에, 따라서 S4 단계로부터 서모스탯(6)이 개방된 것을 검출할 수 있다. S4 단계에서 제 2 냉각수온(T2)의 변화량(ΛT2)이 제 1 기준치(Tr1) 보다 크면, 서모스탯(6)이 개방온도(To) 이하에서 개방된 상태이므로, 경보 장치를 작동시켜 운전자에게 경고한다(S5). 여기서, 경보장치는 경고등 또는 경음기가 사용될 수 있다.When the first cooling water temperature T 1 is lower than the opening temperature T o in step S3, the change amount ΛT 2 of the second cooling water temperature is compared with the first reference value T r1 (S4). That is, when the thermostat 6 fails or is opened at a temperature lower than the opening temperature T o , the warmed coolant flowing from the water jacket 2 is mixed with the coolant of the radiator 4 to cool the temperature of the radiator 4, In other words, since the second cooling water temperature T 2 is raised, it is possible to detect that the thermostat 6 is opened from the step S4. If the change amount ΛT 2 of the second cooling water temperature T 2 is greater than the first reference value T r1 at step S4, the thermostat 6 is opened at or below the opening temperature T o , and thus the alarm device is Operate to warn the driver (S5). Here, the warning device may be used warning lights or horns.

S3 단계에서 제 1 냉각수온(T1)이 개방온도(To)보다 낮지 않으면, 제 1 냉각수온(T1)이 개방온도(To)보다 높은지 판단한다(S6). 만약 제 1 냉각수온(T1)이 개방온도(To)보다 높으면, 제 2 냉각수온의 변화량(ΛT2)와 제 2 기준치(Tr2)를 비교한다(S7). 즉, 서모스탯(6)이 고장나 개방온도(To)에서 개방되지 않은 경우, 워터재킷(2)의 냉각수가 라디에이터(4)로 유출되지 않아 제 2 냉각수온(T2)이 상승되지 않기 때문에, S7 단계로부터 서모스탯(6)이 개방온도(To)에서 개방되지 않은 것을 검출할 수 있다.If the first cooling water temperature (T 1 ) is not lower than the opening temperature (T o ) in step S3, it is determined whether the first cooling water temperature (T 1 ) is higher than the opening temperature (T o ) (S6). If the first cooling water temperature T 1 is higher than the opening temperature T o , the change amount Λ T 2 of the second cooling water temperature is compared with the second reference value T r2 (S7). That is, when the thermostat 6 fails or is not opened at the opening temperature T o , the cooling water of the water jacket 2 does not flow out to the radiator 4 so that the second cooling water temperature T 2 does not rise. Therefore, it can be detected from the step S7 that the thermostat 6 is not opened at the opening temperature T o .

S7 단계에서 제 2 냉각수온의 변화량(ΛT2)이 제 2 기준치(Tr2) 보다 작으면, 서모스탯(6)이 개방온도 이상에서 개방되지 않은 상태이다. 이 경우, 액츄에이터(12)를 작동시켜 바이패스관(11)을 개방한다(S8). 이에 따라, 워터 재킷(2)의 냉각수가 바이패스관(11)을 통해 라디에이터로 순환될 수 있어, 서모스탯(6)의 고장에 따른 엔진(1)의 과열을 방지할 수 있다. 동시에, 경보 장치를 작동시켜 운전자에게 서모스탯(6)의 고장을 경고한다(S4).If the change amount ΛT 2 of the second cooling water temperature is smaller than the second reference value T r2 in the step S7, the thermostat 6 is not opened above the opening temperature. In this case, the actuator 12 is operated to open the bypass pipe 11 (S8). Accordingly, the coolant of the water jacket 2 can be circulated to the radiator through the bypass pipe 11, thereby preventing overheating of the engine 1 due to the failure of the thermostat 6. At the same time, by operating the alarm device to warn the driver of the failure of the thermostat (6) (S4).

상기된 바와 같은 본 발명에 따르면, 워터재킷의 냉각수온과 라디에이터의 냉각수온의 변화량으로부터 서모스탯의 고장을 진단하며 이를 운전자에게 경고한다. 따라서, 운전자가 서모스탯의 고장을 적시에 검출하여 교체할 수 있으므로, 서모스탯의 고장으로 인한 엔진의 과열이나 엔진의 열효율 저하 등과 같은 여러 가지 문제점들을 해결할 수 있는 장점이 있다.According to the present invention as described above, the failure of the thermostat from the amount of change in the cooling water temperature of the water jacket and the cooling water temperature of the radiator is diagnosed and warns the driver. Therefore, since the driver can detect and replace the failure of the thermostat in a timely manner, there is an advantage that can solve various problems such as overheating of the engine or lowering of the thermal efficiency of the engine due to the failure of the thermostat.

이상에서는, 본 발명을 특정의 바람직한 실시예에 대해서 도시하고 설명하였다. 그러나, 본 발명은 상술한 실시예에만 한정되는 것은 아니며 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 이하의 특허청구범위에 기재된 본 발명의 기술적 사상의 요지를 벗어남이 없이 얼마든지 다양하게 변경실시할 수 있을 것이다.In the above, the present invention has been illustrated and described with respect to certain preferred embodiments. However, the present invention is not limited only to the above-described embodiments, and those skilled in the art to which the present invention pertains can vary as many without departing from the spirit of the technical idea of the present invention described in the claims below. Modifications may be made.

Claims (2)

워터 재킷의 내부에 설치된 제 1 냉각 수온 센서 및 라디에이터의 냉각수 통로에 설치된 제 2 냉각 수온 센서로부터 각각 제 1 냉각수온(T1) 및 제 2 냉각수온의 변화율(ΛT2)을 검출하는 단계;Detecting a rate of change (ΛT 2 ) of the first cooling water temperature (T 1 ) and the second cooling water temperature, respectively, from the first cooling water temperature sensor installed in the water jacket and the second cooling water temperature sensor installed in the cooling water passage of the radiator; 상기 제 1 냉각수온(T1)을 개방 온도(To)와 비교하고, 상기 제 1 냉각수온이 상기 개방 온도(To)보다 낮을 경우에는 상기 제 2 냉각수온의 변화율(ΛT2)과 제 1 기준치(Tr1)를 비교하여 상기 제 2 냉각수온의 변화율(ΛT2)이 제 1 기준치(Tr1) 보다 크면 서모스탯이 고장인 것으로 판단하며, 상기 제 1 냉각수온(T1)이 상기 개방 온도(To)보다 높을 경우에는 상기 제 2 냉각수온의 변화율(ΛT2)과 제 2 기준치(Tr2)를 비교하여 상기 제 2 냉각수온의 변화율(ΛT2)이 제 2 기준치(Tr2) 보다 작으면 서모스탯이 고장인 것으로 판단하는 단계; 및The first cooling water temperature (T 1 ) is compared with the opening temperature (T o ), and when the first cooling water temperature is lower than the opening temperature (T o ), the rate of change (ΛT 2 ) of the second cooling water temperature and the second 1 comparing the reference value T r1 with the change rate ΛT 2 of the second cooling water temperature larger than the first reference value T r1 , it is determined that the thermostat is faulty, and the first cooling water temperature T 1 is When the opening temperature T o is higher than the change rate ΛT 2 of the second cooling water temperature and the second reference value T r2 , the change rate ΛT 2 of the second cooling water temperature is the second reference value T r2. Less than) determining that the thermostat is faulty; And 상기 단계에서 서모스탯이 고장인 것으로 판단되면 경보 장치를 작동시켜 운전자에게 경고하는 단계를 포함하는 차량용 엔진냉각장치의 서모스탯 고장진단방법.If it is determined that the thermostat is in the step of malfunctioning, the thermostat failure diagnosis method of the vehicle engine cooling system comprising the step of operating a warning device to warn the driver. 제 1 항에 있어서, 상기 서모스탯의 고장을 판단하는 단계에서 상기 제 1 냉각수온(T1)이 상기 개방 온도(To)보다 높고 상기 제 2 냉각수온의 변화율(ΛT2)이 제 2 기준치(Tr2) 보다 클 경우에는 상기 경고 단계와 함께 상기 서모스탯을 거치지 않고 별도의 바이패스관을 통해 워터 재킷의 냉각수를 라디에이터로 바이패스시키는 단계를 실시하는 것을 특징으로 하는 차량용 엔진냉각장치의 서모스탯 고장진단방법.The method of claim 1, wherein in the step of determining the failure of the thermostat, the first cooling water temperature (T 1 ) is higher than the opening temperature (T o ) and the rate of change (ΛT 2 ) of the second cooling water temperature is a second reference value. If greater than (T r2 ) and the warning step of the engine cooling apparatus for a vehicle, characterized in that the step of bypassing the cooling water of the water jacket to the radiator through a separate bypass pipe without passing through the thermostat How to diagnose stat failure.
KR1019990059999A 1999-12-21 1999-12-21 Method for diagnosing thermostat of engine cooling system for a motor vehicle KR100337512B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020036518A (en) * 2000-11-10 2002-05-16 이계안 Water temperature sensor diagnosis controlled device of vehicle and method thereof
KR100907369B1 (en) * 2007-07-31 2009-07-10 현대자동차주식회사 Control apparatus for gas temperature of CNG engine
CN109653860A (en) * 2018-12-14 2019-04-19 安徽江淮汽车集团股份有限公司 A kind of thermostat rationality diagnostic method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020036518A (en) * 2000-11-10 2002-05-16 이계안 Water temperature sensor diagnosis controlled device of vehicle and method thereof
KR100907369B1 (en) * 2007-07-31 2009-07-10 현대자동차주식회사 Control apparatus for gas temperature of CNG engine
CN109653860A (en) * 2018-12-14 2019-04-19 安徽江淮汽车集团股份有限公司 A kind of thermostat rationality diagnostic method
CN109653860B (en) * 2018-12-14 2020-07-24 安徽江淮汽车集团股份有限公司 Thermostat rationality diagnosis method

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