KR100201439B1 - Control and apparatus of abnormal diagnosis for thermostat - Google Patents

Control and apparatus of abnormal diagnosis for thermostat Download PDF

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Publication number
KR100201439B1
KR100201439B1 KR1019960068117A KR19960068117A KR100201439B1 KR 100201439 B1 KR100201439 B1 KR 100201439B1 KR 1019960068117 A KR1019960068117 A KR 1019960068117A KR 19960068117 A KR19960068117 A KR 19960068117A KR 100201439 B1 KR100201439 B1 KR 100201439B1
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South Korea
Prior art keywords
water temperature
cooling water
thermostat
engine
temperature
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KR1019960068117A
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Korean (ko)
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KR19980049408A (en
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김충공
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정몽규
현대자동차주식회사
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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
    • 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
    • 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
    • F01P2031/00—Fail safe
    • F01P2031/18—Detecting fluid leaks
    • 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
    • F01P2031/00—Fail safe
    • F01P2031/32—Deblocking of damaged thermostat

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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

본 발명은 엔진 냉각수의 순환을 제어하는 서모스탯(THERMOSTAT)의 고장판단 장치 및 그에 따른 제어방법에 대한 것으로서, 이를 위해 시동시 제1냉각수온센서(4)로부터 수온값(WT)을 체크하여 30℃보다 작은지 82℃보다 큰지를 판단하는 단계와(S1), 상기의 단계(S1)를 만족하면 차속이 10KPH 이상인지를 판단하는 단계와(S2); 차속이 10KPH 이상이라 판단되면 라디에이터(3) 입출구측의 제2,3냉각수온센서(5)(6)로부터 수온을 체크하는 단계와(S3), 상기의 단계에서 체크된 제2,3냉각수온센서(5)(6)로부터의 냉각수온 차이를 계산하여 수온차(ΔWT)가 설정온도(WTO) 이상인지를 판단하는 단계와(S4), 수온차(ΔWT)가 설정온도(WTO) 이상이면 이때의 제1냉각수온센서(4)로부터의 수온을 체크하여 30℃보다 작으면 냉각수가 리킹상태라고 판정하는 단계와; 수온차(ΔWT)가 설정온도(WTO) 이하이면 이때의 제1냉각수온센서로부터의 수온을 체크하여 82℃보다 크면 서모스탯(2)이 스틱상태라고 판정하는 단계로서 제어가 수행되도록 하는 것이 특징이다.The present invention relates to a failure determination device of the thermostat (THERMOSTAT) for controlling the circulation of the engine coolant and a control method thereof, and for this purpose, by checking the water temperature value (WT) from the first cooling water temperature sensor (4) at start-up 30 Determining whether the vehicle speed is greater than or equal to 10 KPH (S2); If it is determined that the vehicle speed is 10KPH or more, the step of checking the water temperature from the second and third cooling water temperature sensors 5 and 6 on the radiator 3 inlet and outlet sides (S3) and the second and third cooling water temperatures checked in the above steps Determining whether the water temperature difference ΔWT is greater than or equal to the set temperature WT O by calculating the difference in cooling water temperature from the sensors 5 and 6 (S4), and the water temperature difference ΔWT is the set temperature WT O. Checking the water temperature from the first cooling water temperature sensor 4 at this time and determining that the cooling water is in a leaking state when the temperature is less than 30 ° C; When the water temperature difference ΔWT is lower than or equal to the set temperature WT O , the water temperature from the first cooling water temperature sensor is checked at this time, and when the temperature difference is greater than 82 ° C., the control is performed as a step of determining that the thermostat 2 is in a stick state. It is characteristic.

Description

서모스탯(THERMOSTAT)의 고장 판단 장치 및 그에따른 제어방법Fault determination device of thermostat and its control method

본 발명은 엔진 냉각수의 순환을 제어하는 서모스탯(THERMOSTAT)의 고장판단 방법에 대한 것이다.The present invention relates to a failure determination method of the thermostat (THERMOSTAT) for controlling the circulation of the engine coolant.

일반적으로 서모스탯은 엔진의 냉각수 출구측으로 장착되어 냉각수의 일정 온도에 따라서 냉각수 통로를 개폐시키면서 엔진의 예열 및 냉각이 촉진될 수 있도록 하는 냉각수 유동 단속 수단이다.In general, the thermostat is a coolant flow control means that is mounted to the coolant outlet side of the engine to facilitate the preheating and cooling of the engine while opening and closing the coolant passage in accordance with a predetermined temperature of the coolant.

즉 엔진에서 가열된 냉각수는 차량에 따라서 일정 온도(통상 약 82℃)를 기준으로 냉각수에 의해 왁스가 수축 및 팽창을 하면서 서모스탯이 작동되어 라디에이터로 냉각수를 유도시켜 냉각되도록 한 후 재차 엔진으로 공급시켜 엔진이 냉각되도록 하는 것이 엔진의 수냉식 냉각장치인바 한편 냉시동시와 같이 냉각수온이 찬경우에는 상기 서모스탯을 통해 바로 엔진으로 재순환되도록 하므로서 엔진에서의 예열이 촉진되도록 하고 있다.That is, the cooling water heated in the engine is supplied to the engine after the thermostat is operated by inducing cooling water to the radiator while the wax is contracted and expanded by the cooling water based on a certain temperature (usually about 82 ° C) depending on the vehicle. It is a water-cooled cooling device of the engine to allow the engine to cool, while when the coolant temperature is cold, such as during cold start, it is recycled directly to the engine through the thermostat to facilitate preheating in the engine.

이렇게 서모스탯의 작동에 의해 엔진을 순환하게 되는 냉각수의 유동을 제어하므로서 냉시동시에는 엔진의 워밍 업(WARMING UP)을 촉진하고, 그 이후에는 엔진이 과열되지 않도록 하므로서 항상 엔진은 적정의 온도를 유지하면서 안정된 구동성이 유지되도록 하고 있다.By controlling the flow of coolant that circulates the engine by the operation of the thermostat in this way, the engine warms up during cold start, and afterwards, the engine maintains the proper temperature at all times by preventing the engine from overheating. While maintaining a stable driveability.

그러나 상기와 같은 서모스탯이 고장에 의해 라디에이터측으로 계속 열려진 상태가 지속되거나 반대로 닫혀진 상태가 장기화되면 누수(Leaking) 또는 고착(Stick)에 의해 고장을 유발하게 되면서 엔진은 채 가열되지 못한 상태에서 다시 냉각이 되면서 엔진 예열이 대폭 지연이 되거나 반대로 과열된 냉각수가 곧바로 엔진으로 다시 유도되면서 엔진 과열을 촉진시키게 되므로서 엔진 부조를 발생시키게 되는 사례가 많다.However, if the state in which the thermostat is continuously opened to the radiator side due to a failure or the state in which the thermostat is closed is prolonged, the thermostat is caused to leak due to leakage or sticking, and the engine is cooled again without being heated. As a result, the engine preheating is greatly delayed or, on the contrary, the superheated coolant is directly led back to the engine to promote the engine overheating, thereby causing the engine relief.

이에 상기한 문제점을 해결하기 위하여 서모스탯의 작동 상태를 라디에이터 입출구측으로 각각 장착시킨 별도의 수온 센서에 의한 엔진 냉각수 온도차에 의해서 작동 이상 여부를 판정할 수 있도록 하는데 본 발명의 목적이 있다.In order to solve the above problems, it is an object of the present invention to determine whether the operation abnormality is determined by an engine coolant temperature difference by a separate water temperature sensor mounted to the radiator inlet and outlet sides of the thermostat.

상기한 목적을 달성시키기 위하여 본 발명은 엔진으로부터 유출되는 냉각수온을 감지하는 제1냉각수온센서와, 유입되는 냉각수온에 따라 개폐되는 서모스탯과, 가열된 냉각수를 열교환시키는 라디에이터와, 엔진으로 냉각수를 강제순환시키도록 하는 워터 펌프로서 이루어지는 엔진 냉각구조에 있어서, 상기 라디에이터측 유입구와 유출구로는 각각 제2,3냉각수온센서가 장착되도록 하고, 상기 제2,3냉각수온센서로부터의 출력신호는 전자 제어 장치에 체크되도록 하는 구성으로서, 시동시 제1냉각수온센서로부터 수온을 체크하여 30℃보다 작은지 82℃보다 큰지를 판단하는 단계와, 상기의 단계를 만족하면 차속이 10KPH 이상인지를 판단하는 단계와; 차속이 10KPH 이상이라 판단되면 라디에이터 입출구측의 제2,3냉각수온센서로부터 수온을 체크하는 단계와, 상기의 단계에서 체크된 제2,3냉각수온센서로부터의 냉각수온 차이를 계산하여 수온차가 설정온도 이상인지를 판단하는 단계와, 수온차가 설정온도 이상이면 이때의 제1냉각수온센서로부터의 수온을 체크하여 30℃보다 작으면 냉각수가 리킹상태라고 판정하는 단계와; 수온차가 설정온도 이하이면 이때의 제1냉각수온센서로부터의 수온을 체크하여 82℃보다 크면 서모스탯이 스틱상태라고 판정하는 단계로서 이루어지도록 하는 것이 특징이다.In order to achieve the above object, the present invention provides a first coolant temperature sensor for detecting a coolant temperature flowing out of an engine, a thermostat that is opened and closed according to the inlet coolant temperature, a radiator for heat-exchanging the heated coolant, and coolant with an engine. In the engine cooling structure consisting of a water pump for forced circulation, the radiator side inlet and outlet ports are equipped with second and third cooling water temperature sensors, respectively, and the output signal from the second and third cooling water temperature sensors is A configuration to check the electronic control device, the step of checking the water temperature from the first cooling water temperature sensor at start-up to determine whether it is less than 30 ℃ or greater than 82 ℃, and if the above step is satisfied to determine whether the vehicle speed is 10KPH or more Making a step; If it is determined that the vehicle speed is 10 KPH or more, the water temperature difference is set by checking the water temperature from the second and third cooling water temperature sensors at the radiator inlet and outlet sides, and calculating the difference of the cooling water temperature from the second and third cooling water temperature sensors checked at the above step. Determining whether the temperature is equal to or greater than temperature, checking the water temperature from the first cooling water temperature sensor at this time when the temperature difference is greater than or equal to the set temperature, and determining that the cooling water is in the leaking state when the temperature is smaller than 30 ° C; If the water temperature difference is less than the set temperature, the water temperature from the first cooling water temperature sensor at this time is checked and characterized in that it is made as a step of determining that the thermostat is in the stick state if it is greater than 82 ℃.

도 1 은 본 발명에 따른 실시예 구조도1 is a structural diagram of an embodiment according to the present invention

도 2 는 본 발명에 따른 제어 순서를 도시한 플로우차트2 is a flowchart illustrating a control sequence according to the present invention.

※ 도면 중 주요 부분에 대한 부호의 설명※ Explanation of the code for the main part of the drawing

1 : 엔진1: engine

2 : 서모스탯(THERMOSTAT)2: Thermostat

3 : 라디에이터3: radiator

4 : 제 1 냉각 수온 센서4: first cooling water temperature sensor

5 : 제 2 냉각 수온 센서5: second cooling water temperature sensor

6 : 제 3 냉각 수온 센서6: third cooling water temperature sensor

7 : 전자 제어 장치(Eletronic Control Unit)7: Electronic Control Unit

이를 첨부한 실시예 도면을 참조하여 보다 상세하게 설명하면 도 1 은 본 발명에 따른 실시예 구조를 도시한 개략도로서, 도면 부호 1 은 엔진이다.Referring to this in more detail with reference to the accompanying drawings, Figure 1 is a schematic diagram showing an embodiment structure according to the present invention, 1 is an engine.

엔진(1)으로부터 냉각수가 유출되는 단부에는 제1냉각수온센서(4)와 함께 서모스탯(2)이 장착되고, 상기 서모스탯(2)으로부터는 라디에이터(3) 및 워터 펌프(9)가 연결이 되는바 특히 워터 펌프(9)로 연결되도록 하는 파이프는 통상 바이패스관(8)이라 하여 엔진의 수냉식 냉각장치를 이룬다.A thermostat (2) is mounted at the end portion at which the coolant flows out of the engine (1) together with the first coolant temperature sensor (4), and a radiator (3) and a water pump (9) are connected from the thermostat (2). In particular, the pipe to be connected to the water pump 9 is generally referred to as the bypass pipe (8) to form a water-cooled cooling device of the engine.

이에 본 발명에서는 상기 라디에이터(3)의 유출입구에 각각 제2냉각수온센서(5)와 제3냉각수온센서(6)가 장착되도록 하고, 전자 제어 장치(7, Electronic Control Unit, 이하 ECU로 약칭함)에서는 상기한 제1,2,3냉각수온센서(4)(5)(6)로부터의 온도값을 체크되면서 서모스탯(2)의 고장 여부를 판정하도록 하는 것이다.Accordingly, in the present invention, the second cooling water temperature sensor 5 and the third cooling water temperature sensor 6 are mounted at the outlets of the radiator 3, respectively, and abbreviated as an electronic control unit 7, hereinafter called ECU. In the above), the temperature values from the first, second, and third cooling water temperature sensors 4, 5, and 6 are checked while determining whether or not the thermostat 2 is broken.

즉 엔진(1)으로부터 유출되는 냉각수와 라디에이터(3)측으로 유도되는 냉각수와 라디에이터(3)를 통과한 냉각수의 온도를 ECU(7)가 체크하여 서모스탯(2)의 작동성이 체크되도록 하는 것이다.That is, the ECU 7 checks the temperature of the coolant flowing out of the engine 1 and the coolant introduced to the radiator 3 and the coolant passing through the radiator 3 so that the operability of the thermostat 2 is checked. .

이하 상기의 구성에 따른 서모스탯(2)의 고장 판단 과정을 살펴보면 도 2 에서와 같이 우선 ECU(7)에서는 시동시 제1냉각수온센서(4)를 통해 엔진으로부터 유출되는 냉각수 온도(WT)를 체크한다(S1).Referring to the failure determination process of the thermostat (2) according to the above configuration as shown in FIG. 2, first, the ECU (7) is the coolant temperature (WT) flowing out from the engine through the first cooling water temperature sensor (4) when starting Check (S1).

이때 체크되는 냉각수 온도(WT)가 30℃보다 작거나 82℃보다 큰지를 체크하여(S2) 상기의 조건을 만족하지 않으면 판정을 유보하고, 만족하면 이때의 차속을 체크하여 현재의 차속이 10KPH 이상이 되는지를 체크한다(S3).At this time, if the coolant temperature (WT) checked is smaller than 30 ° C or higher than 82 ° C (S2), the determination is suspended if the above conditions are not satisfied. It is checked whether it becomes (S3).

차속이 10KPH 이상으로 체크되면 제2,3냉각수온센서(5)(6)로부터 수온을 체크하고(S4), 상기 제2,3냉각수온센서(5)(6)로부터의 수온차(ΔWT)를 계산한다(S5).If the vehicle speed is checked at 10 KPH or more, the water temperature is checked from the second and third cooling water temperature sensors 5 and 6 (S4), and the water temperature difference ΔWT from the second and third cooling water temperature sensors 5 and 6 is determined. Calculate (S5).

상기의 단계에서의 계산된 수온차(ΔWT)가 설정온도보다 큰지를 판단하여(S6) 설정온도(WTO)보다 크면 다시 제1냉각수온센서(4)에서의 체크되는 수온값이 30℃보다 작은지를 체크하여(S7) 작다고 판단되면 리킹상태로 고장판정을 하고(S8), 크다고 판단되면 정상으로 판정을 한다(S11).It is determined whether the calculated water temperature difference ΔWT in the above step is greater than the set temperature (S6), and if it is larger than the set temperature (WT O ), the water temperature value checked by the first cooling water temperature sensor 4 is again higher than 30 ° C. If it is determined to be small (S7), if it is determined to be small, a failure determination is made in a leaking state (S8). If it is determined to be large, it is determined to be normal (S11).

또한 상기의 단계에서(S6) 체크되는 수온차(ΔWT)가 설정온도(WTO)보다 작다고 판단되면 다시 제1냉각수온센서(4)에서의 체크되는 수온값이 82℃보다 큰지를 체크하여(S9), 크다고 판단되면 스틱상태로 고장판정을 하고(S10), 크지 않다고 판단되면 정상으로 판정을 한다(S11).In addition, if it is determined in the above step (S6) that the water temperature difference ΔWT checked is smaller than the set temperature WT O , it is again checked whether the water temperature value checked by the first cooling water temperature sensor 4 is greater than 82 ° C. ( S9), if it is determined to be large, a failure determination is made in a stick state (S10).

한편 상기에서 수온차(ΔWT)의 설정온도값(WTO)은 5℃ 로서 셋팅되도록 한다.Meanwhile, the set temperature value WT O of the water temperature difference ΔWT is set to 5 ° C.

상기와 같이 라디에이터(3)의 유입구와 유출구측 수온차(ΔWT)가 설정온도(WTO) 이상에서 제1냉각수온센서(4)에서의 수온이 30℃ 이하로 체크되면 이는 서모스탯(2)으로부터 유도되는 냉각수가 라디에이터(3)로 유입되기 전에 외부로 누수됨을 의미하게 되므로 ECU(7)에서는 이때를 고장으로 판정하게 되며, 만일 수온차(ΔWT)가 설정온도(WTO) 이하로 체크되면서 제1냉각수온센서(4)에서의 수온이 82℃ 이상으로 체크되면 이는 서모스탯(2)의 밸브가 막혀(STICK) 냉각수가 라디에이터(3)측으로 제대로 유도되지 못하고 있음을 의미하게 되므로 이때에도 ECU(7)에서는 고장으로 판정을 한다.As described above, when the inlet and outlet side water temperature difference ΔWT of the radiator 3 is above the set temperature WT O , the water temperature of the first cooling water temperature sensor 4 is checked to be 30 ° C. or lower. This means that the coolant derived from leaks to the outside before the radiator 3 flows into the radiator 3, so that the ECU 7 determines the failure as a failure, and if the water temperature difference ΔWT is checked below the set temperature WT O. If the water temperature in the first cooling water temperature sensor 4 is checked to be 82 ° C. or higher, this means that the valve of the thermostat 2 is blocked (STICK), which means that the coolant is not properly guided to the radiator 3 side. In (7), a failure is determined.

상기와 같은 고장판정시 ECU(7)에서는 운전석에 설치되는 별도의 경고수단(10) 즉 경고등이나 디지털 신호기를 작동시켜 알려주게 되는바 이때의 단순한 고장경고를 알려주게 할 수도 있고, 보다 상세하게 리킹상태인지 스틱상태인지를 구별해서 알려주게 할 수도 있는데 예를들어 경고등의 경우 램프의 색깔로 구별하는 식으로 형성되도록 한다.In the failure determination as described above, the ECU 7 informs by operating a separate warning means 10 installed in the driver's seat, that is, a warning light or a digital signal bar, and may indicate a simple failure warning at this time. You can also tell if the status is sticky or not. For example, a warning light can be formed by distinguishing the color of the lamp.

한편 상기와 같은 판단값은 ECU(7)내에서 고장 코드로 기억을 하고 있다 출력되는 신호에 따라 고장판단이 수행되도록 한다.On the other hand, the above-described determination value is stored in the ECU 7 as a fault code so that fault determination is performed according to the output signal.

이로서 종전에는 서모스탯(2)의 고장시 잘못된 엔진 제어에 의해서 엔진 부조등 대단히 심각한 엔진 손상을 유발시키게 되므로서 엔진 구동성을 악화시키고, 내구력을 저하시키곤 하였으나 본 발명의 적용시 서모스탯(2)의 정확하고 신속한 고장 판정에 의해 즉각적인 점검 및 정비를 할 수가 있도록 하므로서 제어계통에서의 안정적인 제어작동을 제공할 수가 있게 된다.As a result, in the past, when the thermostat 2 failed, the engine control was deteriorated due to the inaccurate engine control, resulting in very serious engine damage such as engine relief. It is possible to provide stable control operation in the control system by enabling immediate inspection and maintenance by accurate and rapid failure determination.

그러므로 본 발명에 따라 서모스탯(2)의 정확한 작동성에 대한 정보 제공이 가능해져 운전자는 보다 편안한 운전을 할 수가 있게 되는 동시에 적절한 시기의 고장 판단으로 효율적인 정비가 가능해져 안정되게 엔진을 보호하게 되는 매우 유익한 효과가 있게 되는 것이다.Therefore, according to the present invention, it is possible to provide information on the correct operability of the thermostat (2), so that the driver can operate more comfortably and at the same time, the efficient maintenance is possible by determining the failure at the appropriate time. It will have a beneficial effect.

Claims (4)

엔진(1)으로부터 유출되는 냉각수온을 감지하는 제1냉각수온센서(4)와, 유입되는 냉각수온에 따라 개폐되는 서모스탯(2)과, 가열된 냉각수를 열교환시키는 라디에이터(3)와, 엔진(1)으로 냉각수를 강제순환시키도록 하는 워터 펌프(9)로서 이루어지는 엔진 냉각구조에 있어서,A first coolant temperature sensor 4 for detecting the coolant temperature flowing out of the engine 1, a thermostat 2 that is opened and closed according to the inlet coolant temperature, a radiator 3 for exchanging the heated coolant, and an engine In the engine cooling structure composed of a water pump (9) for forcibly circulating cooling water by (1), 상기 라디에이터(3)측 유입구와 유출구로는 각각 제2,3냉각수온센서(5)(6)가 장착되도록 하고, 상기 제2,3냉각수온센서(5)(6)로부터의 출력신호는 전자 제어 장치(7)에 체크되도록 하는 구성을 특징으로 하는 서모스탯의 고장판단 장치.The inlet and outlet of the radiator 3 side are respectively equipped with second and third cooling water temperature sensors 5 and 6, and output signals from the second and third cooling water temperature sensors 5 and 6 are electronic. Thermostat failure determination device characterized in that the control device 7 to be checked. 시동시 제1냉각수온센서(4)로부터 수온값(WT)을 체크하여 30℃보다 작은지 82℃보다 큰지를 판단하는 단계와(S1),Checking the water temperature value (WT) from the first cooling water temperature sensor (4) at startup to determine whether it is less than 30 ℃ or greater than 82 ℃ (S1), 상기의 단계(S1)를 만족하면 차속이 10KPH 이상인지를 판단하는 단계와(S2);Determining whether the vehicle speed is 10 KPH or more when the step S1 is satisfied (S2); 차속이 10KPH 이상이라 판단되면 라디에이터(3) 입출구측의 제2,3냉각수온센서(5)(6)로부터 수온을 체크하는 단계와(S3),If it is determined that the vehicle speed is 10 KPH or more, checking the water temperature from the second and third cooling water temperature sensors 5 and 6 on the radiator 3 inlet and outlet sides (S3), 상기의 단계에서 체크된 제2,3냉각수온센서(5)(6)로부터의 냉각수온 차이를 계산하여 수온차(ΔWT)가 설정온도(WTO) 이상인지를 판단하는 단계와(S4),Determining whether the water temperature difference ΔWT is greater than or equal to the set temperature WT O by calculating a difference in cooling water temperature from the second and third cooling water temperature sensors 5 and 6 checked in the above step (S4), 수온차(ΔWT)가 설정온도(WTO) 이상이면 이때의 제1냉각수온센서(4)로부터의 수온을 체크하여 30℃보다 작으면 냉각수가 리킹상태라고 판정하는 단계와;Checking the water temperature from the first cooling water temperature sensor 4 at this time when the water temperature difference ΔWT is equal to or higher than the set temperature WT O and determining that the cooling water is in the leaking state when the water temperature difference ΔWT is less than 30 ° C; 수온차(ΔWT)가 설정온도(WTO) 이하이면 이때의 제1냉각수온센서로부터의 수온을 체크하여 82℃보다 크면 서모스탯(2)이 스틱상태라고 판정하는 단계;Checking the water temperature from the first cooling water temperature sensor at this time when the water temperature difference ΔWT is less than or equal to the set temperature WT O and determining that the thermostat 2 is in a stick state when it is larger than 82 ° C; 로서 이루어지도록 하는 것을 특징으로 하는 서모스탯의 고장판단 제어방법.Fault determination control method of the thermostat, characterized in that made as. 제 2 항에 있어서,The method of claim 2, 상기에서 제2,3냉각수온센서(5)(6)로부터 감지되는 수온값간 수온차(ΔWT)에 대한 전자 제어 장치(7)내 설정온도는(WTO)는 5℃ 로서 셋팅됨을 특징으로 하는 서모스탯의 고장판단 제어방법.In the above, the set temperature (WT O ) in the electronic control apparatus 7 for the water temperature difference ΔWT between the temperature values detected by the second and third cooling water temperature sensors 5 and 6 is set as 5 ° C. How to control fault determination of thermostat. 제 2 항에 있어서,The method of claim 2, 전자 제어 장치(7)에서 스틱상태 또는 리킹상태로 고장 판정이 되면 상기 전자 제어 장치(7)는 운전석에 별도로 설치되는 경고수단(10)을 작동시켜 이를 운전자에게 알려줄 수 있도록 함을 특징으로 하는 서모스탯의 고장판단 제어방법.When it is determined that the electronic control device 7 is in the stick state or the leaking state, the electronic control device 7 operates the warning means 10 separately installed in the driver's seat so that the driver can be notified. How to control fault determination of stats.
KR1019960068117A 1996-12-19 1996-12-19 Control and apparatus of abnormal diagnosis for thermostat KR100201439B1 (en)

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KR100376667B1 (en) * 1999-08-16 2003-03-15 현대자동차주식회사 Method for sensing out of order thermostat of vehicle
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KR100411079B1 (en) * 2000-12-30 2003-12-18 기아자동차주식회사 A method for diagnose an engine cooling system and a system thereof
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