KR20070045477A - A misfuction detection method and apparatus of the coolant temperature sensor - Google Patents

A misfuction detection method and apparatus of the coolant temperature sensor Download PDF

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KR20070045477A
KR20070045477A KR1020050101808A KR20050101808A KR20070045477A KR 20070045477 A KR20070045477 A KR 20070045477A KR 1020050101808 A KR1020050101808 A KR 1020050101808A KR 20050101808 A KR20050101808 A KR 20050101808A KR 20070045477 A KR20070045477 A KR 20070045477A
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cooling water
temperature sensor
water temperature
temperature
failure
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KR1020050101808A
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Korean (ko)
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KR100747229B1 (en
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장수영
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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
    • 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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/14—Safety means against, or active at, failure of coolant-pumps drives, e.g. shutting engine down; Means for indicating functioning of coolant pumps
    • 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
    • F01P2025/08—Temperature
    • F01P2025/42—Intake manifold 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements

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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 냉각수온센서 고장진단 방법 및 장치에 한 것으로서, 특히 종래의 지멘스 로직(LOGIC)을 이용한 서모스탯의 모니터링(THERMOSTAT MONITORING)에서, 냉각수온 센서가 고장을 일으켜 냉각수온센서의 측정온도가 특정 온도의 영역에서의 값만을 나타내어 고착(STUCK)되는 경우에 있어서, 새로운 로직을 추가함으로써 보다 확장된 온도영역에서 냉각수온센서의 고장여부의 진단이 가능해져 고장난 냉각수온센서를 조기에 정비 또는 교체할 수 있고, 원가의 상승이 없다는 점과 함께 OBD-Ⅱ의 법규에 대응할 수 있는 효과를 가지게 되는 이점이 있다. The present invention relates to a method and apparatus for diagnosing a cooling water temperature sensor, in particular, in a conventional THERMOSTAT MONITORING using Siemens logic (LOGIC), the cooling water temperature sensor causes a failure so that the measured temperature of the cooling water temperature sensor is specified. In the case of sticking by showing only the value in the temperature range, it is possible to diagnose the failure of the coolant temperature sensor in the extended temperature range by adding new logic, so that the failed coolant temperature sensor can be repaired or replaced early. In addition, there is no cost increase, and there is an advantage of having an effect that can cope with the regulations of OBD-II.

냉각수온센서, 서모스탯(THERMOSTAT), Cooling Water Temperature Sensor, Thermostat,

Description

냉각수온센서의 고장 진단 방법 및 장치 {A misfuction detection method and apparatus of the coolant temperature sensor}A misfuction detection method and apparatus of the coolant temperature sensor

도 1은 냉각수온센서가 70 ℃ 이상에서 고착된 상태를 보여주는 그래프,1 is a graph showing a state in which the cooling water temperature sensor is fixed at 70 ° C. or higher,

도 2는 차량의 소킹여부에 따른 흡기온 상승여부를 나타낸 그래프, 2 is a graph showing whether the intake air temperature rises depending on whether the vehicle is soaked;

도 3은 본 발명에 따른 54.75 ℃ 이상에서 고착된 냉각수온 센서의 고장을 진단하는 로직의 순서도(FLOW-CHART),3 is a flow chart (FLOW-CHART) for diagnosing the failure of the cooling water temperature sensor stuck at 54.75 ℃ or more according to the present invention,

도 4는 본 발명에 따른 냉각수온센서 고장진단 장치의 블록도이다.4 is a block diagram of a cooling water temperature sensor failure diagnosis apparatus according to the present invention.

<도면의 주요 부분에 관한 부호의 설명><Explanation of symbols on main parts of the drawings>

10: 냉각수온센서 20: 흡기온센서10: cooling water temperature sensor 20: intake air temperature sensor

30: ECU(Electronic Control Unit) 30: Electronic Control Unit (ECU)

본 발명은 차량의 냉각수온센서의 고장 진단 방법 및 장치에 관한 것이다. 특히 냉각수온센서의 고장진단의 진입조건을 만족하고 모델 냉각수온과 일정 시간동안 흡기온의 거동을 살펴서, 냉각수온센서의 고장여부를 진단하는 방법 및 장치에 관한 것이다.The present invention relates to a method and apparatus for diagnosing a failure of a cooling water temperature sensor of a vehicle. In particular, the present invention relates to a method and apparatus for diagnosing a failure of a cooling water temperature sensor by satisfying the entry condition of the failure diagnosis of the cooling water temperature sensor and examining the model cooling water temperature and the behavior of the intake air temperature for a predetermined time.

일반적으로 자동차 분야에 있어서, 특히 북미의 OBD-Ⅱ(On Board Diagnosis) 법규에 대응하기 위해, 냉각 수온 센서 등의 고장 여부를 ECU(Electronic Control Unit)에서 판단하고 이는 ECU 내부의 소프트웨어(Software) 또는 로직(Logic)에 의해 이루어진다. In the automotive field, in particular, in order to comply with the OBD-II (On Board Diagnosis) laws of North America, the ECU (Electronic Control Unit) determines whether a cooling water temperature sensor or the like has failed, It is done by logic.

냉각수온센서의 고장으로 인해 냉각수온센서가 특정온도 이상의 영역에서의 값만을 가지고 그 이하의 값을 가지지 않는 경우, 냉각수온센서가 특정온도 이상에서 고착(Stuck)되었다고 하고, 상기 OBD-Ⅱ 법규를 만족하기 위해서는, 실제 냉각수온이 상승하는 경우에도 냉각수온센서의 측정온도가 설정 상한값 이하의 영역에서의 값만을 나타내게 되어 냉각수온센서가 설정 상한값 이하에서 고착되는 현상 또는 실제 냉각수온이 하강하는 경우에도 냉각수온센서의 측정온도가 설정 하한값 이상의 영역에서의 값만을 나타내게 되어 냉각수온센서가 설정 하한값 이상에서 고착되는 현상이 발생하면 이를 고장으로 진단하여야 한다. If the cooling water temperature sensor has only a value in a region above a certain temperature due to a malfunction of the cooling water temperature sensor and does not have a value below that, it is said that the cooling water temperature sensor is stuck at a temperature above a certain temperature. In order to be satisfied, even when the actual coolant temperature rises, the measured temperature of the coolant temperature sensor shows only the value in the range below the set upper limit value, and even if the coolant temperature sensor is stuck below the set upper limit value or the actual coolant temperature drops. If the measured temperature of the coolant temperature sensor shows only the value in the region above the set lower limit value, if the phenomenon occurs that the coolant temperature sensor is stuck above the set lower limit value, it should be diagnosed as a failure.

도 1은 냉각수온센서가 70 ℃ 이상에서 고착된 상태를 보여주는 그래프이다. 그래프에서 고장난 냉각수온센서의 경우, 시동 초기 실제 냉각수온이 0 ℃ 에서부터 상승하다가 70 ℃ 이하로 그 값이 하강하는 경우에 냉각수온센서의 측정온도가 70 ℃ 이상의 영역에서의 값만을 나타내게 된다. 1 is a graph showing a state in which the cooling water temperature sensor is fixed at 70 ° C. or higher. In the case of the failed cooling water temperature sensor in the graph, when the actual cooling water temperature rises from 0 ° C and falls below 70 ° C at the initial stage of startup, the measured temperature of the cooling water temperature sensor is only displayed in the range of 70 ° C or more.

종래 로직의 서모스탯 모니터링(THERMOSTAT MONITORING)에 의하면, 시동시 냉각수온이 54.75 ℃ 이하인 경우에는, 로직 자체에서 계산한 냉각수온 값과 센서에 의한 냉각수온을 비교하여 고장을 진단하였지만, 냉각수온센서가 54.75 ℃ 이상에서 고착된 경우에는 냉각수온센서의 고장을 진단할 수 없다.According to conventional THERMOSTAT MONITORING, when the coolant temperature is 54.75 ℃ or lower at startup, the fault is diagnosed by comparing the coolant temperature calculated by the logic itself with the coolant temperature by the sensor. If it is stuck above 54.75 ℃, it is impossible to diagnose the failure of the cooling water temperature sensor.

냉각수온센서가 완전히 고착되어 전혀 움직이지 않는 경우를 진단하는 로직은 있지만, 상기한 바와 같은 종래기술에 따른 냉각수온센서 고장진단방법에 의하는 경우에는 도 1의 그래프와 같이 높은 온도영역에서 고착된 냉각수온센서의 고장을 진단할 수 없는 문제점이 있다. Although there is logic for diagnosing the case where the cooling water temperature sensor is completely fixed and not moving at all, the cooling water temperature sensor is fixed in a high temperature region as shown in the graph of FIG. There is a problem that can not diagnose the failure of the cooling water temperature sensor.

본 발명은 상기한 종래 기술의 문제점을 해결하기 위하여 안출된 것으로서, 냉각수온 센서가 특정 온도 이상에서 고착된 경우, 새로운 로직을 추가함으로써 높은 온도영역에서의 냉장수온센서의 고장을 진단할 수 있는 방법 및 장치를 제공하는데 그 목적이 있다.The present invention has been made to solve the above-mentioned problems of the prior art, and when the cooling water temperature sensor is stuck at a specific temperature or more, a method for diagnosing the failure of the cold water temperature sensor in a high temperature region by adding new logic. And to provide a device.

상기한 과제를 해결하기 위한 본 발명에 따른 냉각수온센서의 고장 진단은 시동시 흡기온과 시동시 냉각수온을 이용하여 냉각수온센서의 고장진단의 진입 조건에 해당하는지를 판단하는 제 1단계와; 상기 제 1단계에서 냉각수온센서의 고장진단의 진입 조건에 해당한다고 판단되는 경우, 모델 냉각수온 값을 계산하는 제 2 단계; 상기 제 2단계 후, 모델 냉각수온 값이 기준 온도 값 이상이 될 때까지 모델 냉각수온 값의 계산을 반복하는 제 3단계; 상기 제 3단계에서, 상기 모델 냉각수온 값이 기준 온도 값 이상이 되면, 주행중 흡기온이 증가하는지를 판단하는 제 4단계와; 상기 제 4단계에서 주행중 흡기온이 증가하는 경우, 냉각수온센서를 고장으로 판단하는 제 5단계를 포함하여 구성된다.Diagnosis of the cooling water temperature sensor according to the present invention for solving the above problems comprises the first step of determining whether the entry condition of the failure diagnosis of the cooling water temperature sensor using the intake air temperature and the cooling water temperature at startup; A second step of calculating a model coolant temperature value when it is determined that the first step corresponds to an entry condition for failure diagnosis of the coolant temperature sensor; A third step of repeating the calculation of the model cooling water temperature value until the model cooling water temperature value is equal to or greater than the reference temperature value after the second step; In the third step, determining whether the intake air temperature increases while the model coolant temperature is greater than or equal to a reference temperature value; In the fourth step, when the intake air temperature increases while driving, the cooling water temperature sensor is configured to include a fifth step of determining the failure.

이하, 본 발명의 실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

냉각수온은 자동차가 일정 시간 운행하지 않는 경우에는 외부의 온도에 따라 변동된다. 차량을 충분히 오랜 시간동안 시동을 오프(OFF)하게 되면 즉, 차량을 소킹(OVERNIGHT SOAKING)시키면 흡기온과 냉각수온은 대기온으로 수렴하게 된다. Cooling water temperature is changed according to the outside temperature when the car is not running for a certain time. When the vehicle is turned off for a long time, that is, when the vehicle is OVERNIGHT SOAKING, the intake air temperature and the cooling water temperature converge to the atmospheric temperature.

도 2는 차량의 소킹여부에 따른 흡기온 상승여부를 나타낸 그래프이다. 도 2를 참조하면, 시동시 냉각수온이 특정 온도보다 큰 상태에서는 차량이 충분히 소킹되지 않은 상태가 되어 차량 주행 시 흡기온은 내려가고, 차량이 충분히 소킹된 상태에서는 주행시 흡기온은 올라가는 현상이 발생한다. 2 is a graph showing whether the intake air temperature rises depending on whether the vehicle is soaked. Referring to FIG. 2, when the cooling water temperature is greater than a specific temperature at start-up, the vehicle is not sufficiently soaked, and the intake temperature is lowered when the vehicle is driven, and the intake temperature is increased when the vehicle is sufficiently soaked. do.

따라서 차량이 이전 사이클에서 워밍업(Warmming Up)되고 충분히 소킹된 후, 냉각수온이 54.75 ℃ 보다 큰 경우임에도 불구하고 흡기온이 증가하면 이는 냉각수온센서의 고장진단의 진입조건에 반하게 되어 고장으로 판단하는 방식을 그 특징으로 한다. Therefore, after the vehicle has warmed up in the previous cycle and soaked sufficiently, if the intake air temperature increases despite the case where the coolant temperature is greater than 54.75 ° C, this is contrary to the entry condition of the failure diagnosis of the coolant temperature sensor and is considered to be a failure. It is characterized by the way of doing.

도 3은 본 발명에 따른 54.75 ℃ 이상에서 고착된 냉각수온 센서의 고장을 진단하는 로직의 순서도(FLOW-CHART)이고, 도 4는 본 발명에 따른 냉각수온센서 고장진단 장치의 블록도로서, 본 발명에 따른 냉각수온센서의 고장 진단 방법을 살펴보면 다음과 같다.3 is a flow chart (FLOW-CHART) of diagnosing the failure of the cooling water temperature sensor stuck at 54.75 ℃ or more according to the present invention, Figure 4 is a block diagram of the cooling water temperature sensor failure diagnosis apparatus according to the present invention, Looking at the failure diagnosis method of the cooling water temperature sensor according to the invention as follows.

우선, 냉각수온센서의 고장진단의 진입조건을 판단하는 단계(S10)로서 차량의 소킹여부, 냉각수온센서(10)를 통해 얻은 시동시 냉각수온이 특정온도보다 큰 값인지여부, 이전 구동사이클(Driving Cycle)에서 차량이 워밍업(Warmming Up)되었는지 여부로 이루어진다. First, as a step (S10) of determining the entry condition of the failure diagnosis of the cooling water temperature sensor, whether or not the vehicle is soaked, whether the cooling water temperature at the start obtained through the cooling water temperature sensor 10 is greater than a specific temperature, and the previous driving cycle ( In the driving cycle, the vehicle is warmed up.

여기서 시동시의 흡기온 값이 차량이 소킹된 상태에서의 흡기온의 기준온도보다 더 큰 값인 경우에는 냉각의 효과가 없으므로, 차량의 소킹여부는 흡기온센서(20)롤 통해 얻은 시동시의 흡기온 값이 차량의 소킹(Soaking)된 상태에서의 흡기온의 기준온도보다 작은 지 여부와 이전 구동사이클에서 ECU(30)에 저장된 값보다 작은 지 여부로 판단한다.Here, if the intake air temperature at the start is greater than the reference temperature of the intake air temperature when the vehicle is soaked, there is no cooling effect. It is determined whether the ON value is smaller than the reference temperature of the intake air temperature in the soaked state and whether the ON value is smaller than the value stored in the ECU 30 in the previous driving cycle.

한편, 냉각수온센서의 고장진단의 진입조건(S10)을 모두 만족하는 경우에는 ECU(30)에서 모델 냉각수온 값을 계산하는 단계(S20)로 넘어가며 이 때 모델 냉각수온 값이 기준 값보다 커질 때까지 로직을 반복한다(S20, S30).On the other hand, when all the entry conditions (S10) of the failure diagnosis of the cooling water temperature sensor are satisfied, the process proceeds to step (S20) of calculating the model cooling water temperature value in the ECU 30, where the model cooling water temperature value becomes larger than the reference value. The logic is repeated until (S20, S30).

여기서 모델 냉각수온이란, 냉각수온센서의 고장 진단에 사용되는 가상의 수온으로 초기 시동시 흡기온 센서(20)의 온도를 읽어 이를 초기값으로 설정하고 이후는 공기량 센서의 출력정보를 이용하여 엔진에 흡입되는 공기량이 많아지면 수온 상승률이 비교적 급격히 이루어지도록 하며, 반대로 흡입공기량이 작아지는 영역은 모델온도 상승이 완만하게 이루어지도록 한다. 로직에 따라서는 모델수온 구간별로도 상승기울기를 다르게 할 수 있다.Here, the model cooling water temperature is a virtual water temperature used for diagnosing the failure of the cooling water temperature sensor. The temperature of the intake air temperature sensor 20 is read at the time of initial start-up and set to an initial value. As the amount of air sucked in increases, the rate of increase in water temperature is made relatively sharply. On the contrary, the area in which the amount of intake air decreases makes the model temperature rise slowly. Depending on the logic, the rising slope can be different for each model water temperature section.

모델 냉각수온 값이 기준온도보다 커지면(S30) 주행중 흡기온이 증가하는 지를 진단하는 단계(S40)로 간다. 도 2에 도시된 바와 같이, 주행중 흡기온이 증가되는 경우는 차량이 충분히 소킹된 상태에서 일어나는 현상이므로 위 로직의 진입조건과 상반되는 것이므로 냉각수온 센서(10)를 고장으로 진단하게 되는 단계(S50)로 가게 된다. 주행중 흡기온이 감소하면 고장 진단을 중지하게 된다.  When the model coolant temperature value is greater than the reference temperature (S30), the step of diagnosing whether the intake air temperature increases while driving is performed (S40). As shown in FIG. 2, when the intake air temperature is increased while driving, a phenomenon occurs in a state in which the vehicle is sufficiently soaked, and thus is opposite to the entry condition of the logic. Go to) If the intake temperature decreases while driving, the diagnosis of the fault stops.

상기 1단계(S10) 또는 상기 4단계(S40)가 만족되지 않는 경우에는 진단을 종료하고 종래의 지멘스 로직을 이용한 서모스탯의 모니터링(THERMOSTAT MONITORING)을 통해 고장여부를 진단하면 된다.If the first step (S10) or the fourth step (S40) is not satisfied, the diagnosis is terminated and the failure is diagnosed through the monitoring (THERMOSTAT MONITORING) of the thermostat using the conventional Siemens logic.

상기와 같이 구성되는 본 발명의 냉각수온센서 고장진단장치 및 방법에 의한다면 새로운 로직을 추가함으로써 종래의 로직으로는 판단할 수 없었던 높은 온도영역에서의 냉각수온센서의 고장여부를 진단할 수 있게 됨에 따라, 보다 확장된 온도영역에서 냉각수온센서의 고장여부의 진단이 가능해져 고장난 냉각수온센서를 조기에 정비 또는 교체할 수 있고, 원가의 상승이 없다는 점과 함께 OBD-Ⅱ의 법규에 대응할 수 있는 효과를 가지게 되는 이점이 있다. According to the cold water temperature sensor failure diagnosis apparatus and method of the present invention configured as described above by adding a new logic it is possible to diagnose the failure of the coolant temperature sensor in the high temperature region that could not be determined by the conventional logic. Therefore, it is possible to diagnose the failure of the cooling water temperature sensor in the extended temperature range, so that the failed cooling water temperature sensor can be repaired or replaced at an early stage, and there is no increase in cost, and it can cope with the regulations of the OBD-II. There is an advantage to having an effect.

Claims (6)

시동시 흡기온과 시동시 냉각수온을 이용하여 냉각수온센서의 고장진단의 진입 조건에 해당하는지를 판단하는 제 1단계와;A first step of determining whether it corresponds to an entry condition for failure diagnosis of the cooling water temperature sensor by using the intake air temperature at startup and the cooling water temperature at startup; 상기 제 1단계에서 냉각수온센서의 고장진단의 진입 조건에 해당한다고 판단되는 경우, 모델 냉각수온 값을 계산하는 제 2단계; A second step of calculating a model coolant temperature value when it is determined that the first step corresponds to an entry condition of a failure diagnosis of the coolant temperature sensor; 상기 제 2단계 후, 모델 냉각수온 값이 기준 온도 값 이상이 될 때까지 모델 냉각수온 값의 계산을 반복하는 제 3단계;A third step of repeating the calculation of the model cooling water temperature value until the model cooling water temperature value is equal to or greater than the reference temperature value after the second step; 상기 제 3단계에서, 상기 모델 냉각수온 값이 기준 온도 값 이상이 되면, 주행중 흡기온이 증가하는지를 판단하는 제 4단계와; In the third step, determining whether the intake air temperature increases while the model coolant temperature is greater than or equal to a reference temperature value; 상기 제 4단계에서 주행중 흡기온이 증가하는 경우, 냉각수온센서를 고장으로 판단하는 제 5단계를 포함하는 것을 특징으로 하는 냉각수온센서의 고장 진단 방법.And a fifth step of determining the cooling water temperature sensor as a failure when the intake air temperature increases while driving in the fourth step. 청구항 1 에 있어서,The method according to claim 1, 상기 제 1단계 또는 상기 제 4단계가 만족되지 않는 경우에는 진단을 종료하고 종래 서모스탯 모니터링을 통하여 고장을 진단하는 것을 더 포함하는 것을 특징으로 하는 냉각수온센서의 고장 진단 방법.If the first step or the fourth step is not satisfied, the diagnostic method of the cooling water temperature sensor, characterized in that further comprising the step of diagnosing the failure through the conventional thermostat monitoring. 청구항 1 에 있어서,The method according to claim 1, 상기 제 1단계에서 시동시 냉각수온이 54.75 ℃ 보다 큰 것을 특징으로 하는 냉각수온센서의 고장 진단 방법.The method of diagnosing a failure of a cooling water temperature sensor, wherein the cooling water temperature is greater than 54.75 ° C. at the start of the first step. 청구항 1 에 있어서,The method according to claim 1, 상기 제 1단계는 차량이 소킹되고, 시동시 냉각수온이 소정온도보다 크며, 이전 구동사이클에서 차량이 워밍업된 경우에 진단 진입조건을 만족하는 것으로 판단하는 단계로 구성된 것을 특징으로 하는 냉각수온센서의 고장 진단 방법.Wherein the first step is characterized in that the vehicle is soaked, the coolant temperature at start-up is greater than the predetermined temperature, and the step of determining that the diagnostic entry condition is satisfied when the vehicle is warmed up in the previous drive cycle of the cooling water temperature sensor How to diagnose faults. 청구항 4 에 있어서,The method according to claim 4, 상기 차량의 소킹여부는 시동시 흡기온이 흡기온의 기준온도보다 작고, 이전 구동사이클에서 ECU에 저장된 값보다 작은 지로 판단하는 것을 특징으로 하는 냉각수온센서의 고장 진단 방법.The soaking of the vehicle determines whether the intake temperature at start-up is lower than a reference temperature of the intake temperature and smaller than a value stored in the ECU in a previous driving cycle. 냉각수온을 측정하기 위한 냉각수온 센서와; 흡기온을 측정하기 위한 흡기온 센서와; 상기 냉각수온 센서와 흡기온 센서의 출력을 입력받아, 모델 냉각수온이 기준값보다 큰 경우 주행중 흡기온의 상승여부에 따라 냉각수온센서의 고장을 진단하는 ECU를 포함하여 구성된 것을 특징으로 하는 냉각수온센서의 고장 진단 장치.A cooling water temperature sensor for measuring the cooling water temperature; An intake air temperature sensor for measuring intake air temperature; Cooling water temperature sensor and the output of the intake air temperature sensor, the coolant temperature sensor comprising a ECU for diagnosing the failure of the cooling water temperature sensor according to whether the intake temperature rises while the model coolant temperature is greater than the reference value Fault diagnosis device.
KR1020050101808A 2005-10-27 2005-10-27 A misfuction detection method and apparatus of the coolant temperature sensor KR100747229B1 (en)

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KR20190130882A (en) * 2018-05-15 2019-11-25 현대자동차주식회사 Fault diagnosis method of coolant temperature sensor for vehicles
FR3098153A1 (en) * 2019-07-02 2021-01-08 Psa Automobiles Sa PROCEDURE FOR VERIFYING A TEMPERATURE MEASUREMENT IN A HEAT TRANSFER CIRCUIT OF A THERMAL ENGINE

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KR100612964B1 (en) * 2004-04-08 2006-08-14 현대자동차주식회사 Coolant thermostat monitoring system of vehicle and method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190130882A (en) * 2018-05-15 2019-11-25 현대자동차주식회사 Fault diagnosis method of coolant temperature sensor for vehicles
FR3098153A1 (en) * 2019-07-02 2021-01-08 Psa Automobiles Sa PROCEDURE FOR VERIFYING A TEMPERATURE MEASUREMENT IN A HEAT TRANSFER CIRCUIT OF A THERMAL ENGINE

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