KR20050120985A - Air temperature sensor monitoring control method of vehicle - Google Patents
Air temperature sensor monitoring control method of vehicle Download PDFInfo
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- KR20050120985A KR20050120985A KR1020040046115A KR20040046115A KR20050120985A KR 20050120985 A KR20050120985 A KR 20050120985A KR 1020040046115 A KR1020040046115 A KR 1020040046115A KR 20040046115 A KR20040046115 A KR 20040046115A KR 20050120985 A KR20050120985 A KR 20050120985A
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- 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
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
- F02D2009/0201—Arrangements; Control features; Details thereof
- F02D2009/0223—Cooling water temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
- F02D2009/0201—Arrangements; Control features; Details thereof
- F02D2009/0225—Intake air or mixture temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
본 발명은 흡기온 센서 자기진단의 진입 조건을 강화함으로써 흡기온 센서의 오판 판정을 개선할 수 있는 차량의 흡기온 센서 자기진단 제어방법에 관한 것으로, 시동 및 시동시 냉각수온과 흡기온이 입력되는 가를 검출하는 단계와; 시동후 일정 시간이 경과된 경우 냉각수온과 임의의 설정 온도(A)를 비교하는 단계와; 현재 냉각수온과 시동시 냉각수온의 차이값과 임의의 설정 온도(B)를 비교하는 단계와; 냉각수온이 임의의 설정 온도(A) 보다 크거나, 현재 냉각수온과 시동시 냉각수온의 차이값이 임의의 설정 온도(B)보다 크면 시동후 냉각수온 변화가 있었음을 판단하고, 차속 센서로부터 입력되는 차속과 자기진단 진입을 위해 설정된 최소 차속을 비교하는 단계와; 입력 차속이 설정된 최소 차속 이상이면, 드라이빙 사이클(Driving Cycle)이 만족된 상태로 판단하고, 임의의 설정 시간(C)동안 차속 센서로부터 입력되는 차속과 설정된 임의의 차속을 비교하는 단계와; 입력된 차속이 설정된 임의의 차속보다 작으면 흡기온 센서 자기진단 진입을 위한 예비 조건(Pre-condition)을 만족한 것으로 판단하고, 흡기온 센서의 자기 진단 제어동작을 수행하는 단계를 포함하여 이루어진다.The present invention relates to an intake temperature sensor self-diagnosis control method of a vehicle which can improve the determination of a wrong decision of the intake temperature sensor by strengthening the entry condition of the intake temperature sensor self-diagnosis. Detecting a value; Comparing a cooling water temperature with a predetermined set temperature (A) when a predetermined time has elapsed after startup; Comparing the difference between the current cooling water temperature and the cooling water temperature at startup and an arbitrary set temperature (B); If the coolant temperature is greater than the predetermined set temperature (A) or if the difference between the current coolant temperature and the coolant temperature at startup is greater than the set temperature (B), it is determined that the coolant temperature has changed after startup, Comparing the vehicle speed with the minimum vehicle speed set for entry into the self-diagnosis; Determining that the driving cycle is satisfied when the input vehicle speed is equal to or greater than the set minimum vehicle speed, and comparing the vehicle speed input from the vehicle speed sensor with a predetermined vehicle speed for an arbitrary set time (C); When the input vehicle speed is smaller than a predetermined vehicle speed, the controller determines that the pre-condition for entering the intake air temperature sensor self-diagnosis is satisfied, and performing a self-diagnosis control operation of the intake air temperature sensor.
Description
본 발명은 차량의 흡기온 센서 자기진단 제어방법에 관한 것이다.The present invention relates to a self-diagnosis control method of an intake air temperature sensor of a vehicle.
통상적으로, 흡기온 센서의 자기진단은 크게, 자기진단 진입을 위한 예비 조건(Pre-condition), 자기진단의 과정으로 나누어진다.In general, the self-diagnosis of the intake air temperature sensor is largely divided into a pre-condition and a self-diagnosis process for entering the self-diagnosis.
자기진단의 주된 알고리즘(Algorithm)은 도 1에 도시된 바와 같이 시동시의 흡기온과 현재의 흡기온을 실시간으로 비교하여 두 온도의 차이가 일정 값을 초과하지 않으면 흡기온이 차이가 없는 것(Stuck)으로 간주하여 고장(Fail)으로 판정한다.As shown in FIG. 1, the main algorithm of self-diagnosis compares the intake temperature at the start-up with the current intake temperature in real time, and there is no difference in intake temperature unless the difference between the two temperatures exceeds a predetermined value. It is regarded as Stuck and is determined as a Fail.
도 1은 종래 기술에 따른 차량의 흡기온 센서 자기진단 제어방법을 도시한 흐름도이다.1 is a flowchart illustrating a method of controlling intake temperature sensor self-diagnosis of a vehicle according to the related art.
도 1을 참조하면, 종래 기술에 따른 흡기온 센서 자기진단을 위한 예비 조건은 다음과 같다.Referring to FIG. 1, preliminary conditions for self-diagnosis of the intake air temperature sensor according to the related art are as follows.
먼저, 시동 및 시동시 냉각수온과 흡기온이 제어부로 입력되는 것을 가정한다(S110).First, it is assumed that the cooling water temperature and the intake air temperature are input to the controller at startup and startup (S110).
제어부는 시동후 일정 시간이 경과된 경우 냉각수온과 임의의 설정 온도(A)를 비교한다.The controller compares the cooling water temperature with a predetermined set temperature A when a predetermined time has elapsed since the start-up.
그리고, 현재 냉각수온과 시동시 냉각수온의 차이값과 임의의 설정 온도(B)를 비교한다.Then, the difference between the current cooling water temperature and the cooling water temperature at startup and an arbitrary set temperature (B) are compared.
만약, 냉각수온이 임의의 설정 온도(A) 보다 크거나, 현재 냉각수온과 시동시 냉각수온의 차이값이 임의의 설정 온도(B)보다 크면 시동후 냉각수온 변화가 있었음을 의미한다(S112).If the coolant temperature is greater than the predetermined set temperature (A), or if the difference between the current coolant temperature and the coolant temperature at startup is greater than the predetermined set temperature (B), it means that there has been a change in the coolant temperature after starting (S112). .
이러한 경우 제어부는 흡기온 센서 자기진단 진입을 위한 예비 조건(Pre-condition)을 만족한 것으로 판단한다(S114).In this case, the controller determines that the pre-condition for entering the intake air temperature sensor self diagnosis is satisfied (S114).
이어서, 제어부는 흡기온 센서의 자기진단 제어동작을 수행한다.Subsequently, the controller performs a self-diagnosis control operation of the intake air temperature sensor.
예를 들어, 전술한 (S114)에서 흡기온 센서 자기진단 진입을 위한 예비 조건이 만족된 것으로 판단되면, 제어부는 (S116)으로 진행하여 현재의 흡기온과 시동시 냉각수온의 차이값과 임의의 설정 온도(C)를 비교한다.For example, if it is determined in step S114 that the preliminary condition for entering the intake air temperature sensor self-diagnosis is satisfied, the control unit proceeds to step S116 and the difference between the current intake temperature and the cooling water temperature at startup and an arbitrary value. Compare the set temperature (C).
만약, 전술한 (S116)에서 현재의 흡기온과 시동시 냉각수온의 차이값이 임의의 설정 온도(C)보다 크면 제어부는 흡기온 센서를 정상으로 판단한다.If the difference between the current intake temperature and the cooling water temperature at startup is greater than a predetermined set temperature C in step S116, the controller determines that the intake temperature sensor is normal.
이와는 반대로, 전술한 (S116)에서 현재의 흡기온과 시동시 냉각수온의 차이값이 임의의 설정 온도(C)보다 크지 않으면 제어부는 흡기온 센서를 고장으로 판단한다.On the contrary, if the difference between the current intake temperature and the cooling water temperature at startup is not greater than a predetermined set temperature C in the above-described S116, the controller determines the intake temperature sensor as a failure.
위와 같은 방법을 사용할 때 종래에는 시동후 일정 시간이 경과하였더라도 시동시 흡기온과 현재 흡기온의 차이가 없을 수 있는 조건 발생으로 흡기온 센서가 정상임에도 고장으로 오판하는 경우가 발생하는 문제점이 있었다.When using the above method, even if a predetermined time has passed after the start, there has been a problem that a malfunction occurs even though the intake temperature sensor is normal due to a condition in which there may be no difference between the intake temperature and the current intake temperature at the start.
본 발명의 목적은 흡기온 센서 자기진단의 진입 조건을 강화함으로써 흡기온 센서의 오판 판정을 개선할 수 있는 차량의 흡기온 센서 자기진단 제어방법을 제공하는데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a method for controlling intake temperature sensor self-diagnosis of a vehicle which can improve the misjudge determination of the intake temperature sensor by strengthening the entry condition of the intake temperature sensor self-diagnosis.
상기와 같은 목적을 달성하기 위하여 본 발명은 차량의 흡기온 센서 자기진단 제어방법에 있어서, 시동 및 시동시 냉각수온과 흡기온이 입력되는 가를 검출하는 단계와; 시동후 일정 시간이 경과된 경우 냉각수온과 임의의 설정 온도(A)를 비교하는 단계와; 현재 냉각수온과 시동시 냉각수온의 차이값과 임의의 설정 온도(B)를 비교하는 단계와; 냉각수온이 임의의 설정 온도(A) 보다 크거나, 현재 냉각수온과 시동시 냉각수온의 차이값이 임의의 설정 온도(B)보다 크면 시동후 냉각수온 변화가 있었음을 판단하고, 차속 센서로부터 입력되는 차속과 자기진단 진입을 위해 설정된 최소 차속을 비교하는 단계와; 입력 차속이 설정된 최소 차속 이상이면, 드라이빙 사이클(Driving Cycle)이 만족된 상태로 판단하고, 임의의 설정 시간(C)동안 차속 센서로부터 입력되는 차속과 설정된 임의의 차속을 비교하는 단계와; 입력된 차속이 설정된 임의의 차속보다 작으면 흡기온 센서 자기진단 진입을 위한 예비 조건(Pre-condition)을 만족한 것으로 판단하고, 흡기온 센서의 자기 진단 제어동작을 수행하는 단계를 포함하여 이루어지는 것을 특징으로 한다.In order to achieve the above object, the present invention provides a method for controlling the self-diagnosis of the intake temperature sensor of a vehicle, the method comprising: detecting whether a cooling water temperature and an intake temperature are input at startup and startup; Comparing a cooling water temperature with a predetermined set temperature (A) when a predetermined time has elapsed after startup; Comparing the difference between the current cooling water temperature and the cooling water temperature at startup and an arbitrary set temperature (B); If the coolant temperature is greater than the predetermined set temperature (A) or if the difference between the current coolant temperature and the coolant temperature at startup is greater than the set temperature (B), it is determined that there has been a change in the coolant temperature after starting, and it is input from the vehicle speed sensor. Comparing the vehicle speed with the minimum vehicle speed set for entry into the self-diagnosis; Determining that the driving cycle is satisfied when the input vehicle speed is equal to or greater than the set minimum vehicle speed, and comparing the vehicle speed input from the vehicle speed sensor with a predetermined vehicle speed for an arbitrary set time (C); Determining that the input vehicle speed is smaller than a predetermined vehicle speed, determining that the pre-condition for entering the intake temperature sensor self-diagnosis is satisfied, and performing a self-diagnosis control operation of the intake temperature sensor. It features.
이하 본 발명의 바람직한 실시예를 첨부한 도면을 참조하여 상세히 설명한다. 하기 설명 및 첨부 도면과 같은 많은 특정 상세들이 본 발명의 보다 전반적인 이해를 제공하기 위해 나타나 있으나, 이들 특정 상세들은 본 발명의 설명을 위해 예시한 것으로 본 발명이 그들에 한정됨을 의미하는 것은 아니다. 그리고 본 발명의 요지를 불필요하게 흐릴 수 있는 공지 기능 및 구성에 대한 상세한 설명은 생략한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.
도 2는 본 발명의 실시예에 따른 차량의 흡기온 센서 자기진단 제어동작에 따른 신호의 흐름을 도시한 도면이다.2 is a diagram illustrating a signal flow according to an intake temperature sensor self-diagnosis control operation of a vehicle according to an exemplary embodiment of the present invention.
본 발명의 실시예에 따른 차량의 흡기온 센서 자기진단 제어장치는 냉각수온을 검출하는 냉각수 온도 검출센서, 흡기온도를 검출하는 흡기온도 검출센서, 엔진 회전수를 검출하여 엔진의 기동상태에 관련된 신호를 제어부로 입력하는 엔진 회전수 검출센서, 차속 센서, 제어부(ECU)를 포함하여 구성한다.The intake temperature sensor self-diagnosis control apparatus for a vehicle according to an embodiment of the present invention includes a coolant temperature detection sensor for detecting a coolant temperature, an intake temperature sensor for detecting an intake temperature, and a signal related to an engine running state by detecting an engine speed. And an engine speed detection sensor, a vehicle speed sensor, and a control unit ECU for inputting the control unit to the control unit.
제어부는 본 발명의 실시예에 따른 차량의 흡기온 센서 자기진단 제어에 관련된 전반적인 제어동작을 수행하는 일종의 마이크로 프로세서로 구성한다.The control unit is configured as a kind of microprocessor that performs the overall control operation related to the intake temperature sensor self-diagnosis control of the vehicle according to an embodiment of the present invention.
도 3은 본 발명의 실시예에 따른 차량의 흡기온 센서 자기진단 제어방법을 도시한 흐름도이다.3 is a flowchart illustrating a method of controlling intake temperature sensor self-diagnosis of a vehicle according to an exemplary embodiment of the present invention.
흡기온 센서의 자기진단은 크게, 자기진단 진입을 위한 예비 조건(Pre-condition), 시동시의 흡기온과 시동 이후의 흡기온의 최소/최대 흡기온의 실시간 갱신, 자기진단의 과정으로 나누어진다.Self-diagnosis of intake temperature sensor is divided into pre-condition for entering self-diagnosis, real-time update of minimum and maximum intake temperature of intake temperature at startup and intake temperature after startup, and self-diagnosis. .
본 발명의 실시예에서는 차속 조건을 추가하여 자기진단 진입을 강화하는 특징이 있다.In an embodiment of the present invention, it is characterized by reinforcing the self-diagnosis by adding the vehicle speed condition.
도 3을 참조하면, 본 발명의 실시예에 따른 흡기온 센서 자기진단의 주된 알고리즘(Algorithm)은 다음과 같다.Referring to Figure 3, the main algorithm (Algorithm) of the intake air temperature sensor self-diagnosis according to an embodiment of the present invention is as follows.
먼저, 제어부는 시동 및 시동시 냉각수온과 흡기온이 입력되는 가를 검출한다(S310).First, the control unit detects whether the cooling water temperature and the intake temperature are input at startup and startup (S310).
제어부는 시동후 일정 시간이 경과된 경우 냉각수온과 임의의 설정 온도(A)를 비교한다.The controller compares the cooling water temperature with a predetermined set temperature A when a predetermined time has elapsed since the start-up.
그리고, 현재 냉각수온과 시동시 냉각수온의 차이값과 임의의 설정 온도(B)를 비교한다.Then, the difference between the current cooling water temperature and the cooling water temperature at startup and an arbitrary set temperature (B) are compared.
만약, 냉각수온이 임의의 설정 온도(A) 보다 크거나, 현재 냉각수온과 시동시 냉각수온의 차이값이 임의의 설정 온도(B)보다 크면 제어부는 시동후 냉각수온 변화가 있었음을 판단한다(S312).If the coolant temperature is greater than the predetermined set temperature (A), or if the difference between the current coolant temperature and the coolant temperature at startup is greater than the predetermined set temperature (B), the controller determines that the coolant temperature has changed after startup ( S312).
그리고, 차속 센서로부터 입력되는 차속과 자기진단 진입을 위해 설정된 최소 차속을 비교한다.Then, the vehicle speed input from the vehicle speed sensor is compared with the minimum vehicle speed set for the self-diagnosis entry.
제어부는 입력 차속이 설정된 최소 차속 이상이면, 드라이빙 사이클(Driving Cycle)이 만족된 상태로 판단한다.If the input vehicle speed is equal to or greater than the set minimum vehicle speed, the controller determines that the driving cycle is satisfied.
이어서, 임의의 설정 시간(C)동안 차속 센서로부터 입력되는 차속과 설정된 임의의 차속을 비교한다(S314).Subsequently, the vehicle speed input from the vehicle speed sensor for the predetermined setting time C is compared with the predetermined vehicle speed (S314).
만약, 전술한 (S314)에서 입력된 차속이 설정된 임의의 차속보다 작으면 제어부는 흡기온 센서 자기진단 진입을 위한 예비 조건(Pre-condition)을 만족한 것으로 판단한다(S316).If the vehicle speed input in operation S314 is smaller than the predetermined vehicle speed, the controller determines that the pre-condition for entering the intake air temperature sensor self diagnosis is satisfied (S316).
즉, 제어부는 시동후 일정 시간 경과된 상태에서 냉각수온이 임의의 설정 온도(A)를 초과하고, 현재 냉각수온과 시동시 냉각수온의 차이값이 임의의 설정 온도(B)를 초과하면 웜업(Warm Up)된 것으로 판단한다.That is, when the cooling water temperature exceeds a certain set temperature (A) after a certain time has elapsed after starting, and the difference value between the current cooling water temperature and the cooling water temperature at startup exceeds a certain set temperature (B), a warm-up ( Warm Up).
이어서, 차속이 임의 설정 차속 이상이면, 드라이빙 사이클(Driving Cycle)을 일단 만족하여 흡기온 센서 자기진단 진입을 위한 예비 조건이 만족된 것으로 판단한다.Subsequently, when the vehicle speed is greater than or equal to the predetermined predetermined vehicle speed, it is determined that the driving cycle is satisfied once and the precondition for entering the intake air temperature sensor self diagnosis is satisfied.
흡기온 센서 자기진단 진입을 위한 예비 조건이 만족된 상태에서 제어부는 임의의 시간 동안 차속과 설정된 임의의 차속을 비교한다.The controller compares the vehicle speed with a predetermined vehicle speed for a predetermined time while the precondition for entering the intake air temperature sensor self-diagnosis is satisfied.
고속에서는 흡기온 센서의 자기진단시 오판 가능성이 있으므로 차속이 일정 차속 이하인 경우에만 흡기온 센서의 자기진단을 실행하기 위함이다.At high speeds, the self-diagnosis of the intake air temperature sensor may be misjudged, so that the self-diagnosis of the intake air temperature sensor is performed only when the speed of the intake air temperature sensor is lower than a certain speed.
이어서, 제어부는 흡기온 센서의 자기 진단 제어동작을 수행한다.Subsequently, the controller performs a self-diagnostic control operation of the intake air temperature sensor.
예를 들어, 전술한 (S316)에서 흡기온 센서 자기진단 진입을 위한 예비 조건이 만족된 것으로 판단되면, 제어부는 (S318)으로 진행하여 현재의 흡기온과 시동시 냉각수온의 차이값과 임의의 설정 온도(D)를 비교한다.For example, when it is determined in step S316 that the preliminary conditions for entering the intake air temperature sensor self-diagnosis are satisfied, the control unit proceeds to step S318 and the difference between the current intake temperature and the cooling water temperature at startup and an arbitrary value. Compare the set temperature (D).
그리고, 최대 흡기온과 최소 흡기온의 차이값과 임의의 설정 온도(E)를 비교한다.And the difference value of the maximum intake air temperature and the minimum intake air temperature, and arbitrary preset temperature E are compared.
만약, 전술한 (S318)에서 현재의 흡기온과 시동시 냉각수온의 차이값이 임의의 설정 온도(D)보다 크면 제어부는 흡기온 센서를 정상으로 판단한다.If the difference between the current intake temperature and the cooling water temperature at startup is greater than a predetermined set temperature (D) in step S318, the controller determines that the intake temperature sensor is normal.
또한, 전술한 (S318)에서 최대 흡기온과 최소 흡기온의 차이값과 임의의 설정 온도(E)보다 크면 제어부는 흡기온 센서를 정상으로 판단한다.In addition, when the difference between the maximum intake temperature and the minimum intake temperature and the predetermined set temperature (E) is greater than in the above-described S318, the controller determines that the intake temperature sensor is normal.
이와는 반대로, 전술한 (S318)에서 현재의 흡기온과 시동시 냉각수온의 차이값이 임의의 설정 온도(D)보다 크지 않으면 제어부는 흡기온 센서를 고장으로 판단한다.On the contrary, if the difference value between the current intake temperature and the cooling water temperature at startup is not greater than a predetermined set temperature D in the above-described S318, the controller determines the intake temperature sensor as a failure.
또한, 전술한 (S318)에서 최대 흡기온과 최소 흡기온의 차이값과 임의의 설정 온도(E)보다 크지 않으면 제어부는 흡기온 센서를 고장으로 판단한다.In addition, in step S318, if the difference between the maximum intake temperature and the minimum intake temperature is not greater than the predetermined set temperature E, the controller determines the intake temperature sensor as a failure.
한편, 전술한 (S310)에서 시동 및 시동시 냉각수온과 흡기온이 입력되면, 제어부는 (S320)으로 진행하여 최소 흡기온 초기값과 최대 흡기온 초기값은 시동시 흡기온과 같은 값으로 설정한다.On the other hand, if the cooling water temperature and the intake temperature are input during start-up and start-up in the above-described (S310), the control unit proceeds to (S320) and set the minimum intake temperature initial value and the maximum intake temperature initial value to the same value as the intake temperature at start-up do.
최소 흡기온 초기값 = 최대 흡기온 초기값 = 시동시 흡기온Minimum Intake Temperature Initial Value = Maximum Intake Temperature Initial Value = Intake Temperature at Startup
그리고, (S322)으로 진행하여 흡기온과 최소 흡기온을 비교하고, 흡기온이 최소 흡기온 미만이면, 최소 흡기온을 흡기온으로 설정한다.In step S322, the intake air temperature is compared with the minimum intake air temperature, and if the intake air temperature is less than the minimum intake air temperature, the minimum intake air temperature is set to the intake air temperature.
전술한 (S322)에서 흡기온이 최소 흡기온보다 크면 제어부는 (S324)으로 진행하여 흡기온과 최대 흡기온을 비교한다.If the intake air temperature is greater than the minimum intake air temperature (S322) described above, the control unit proceeds to (S324) to compare the intake air temperature and the maximum intake air temperature.
만약, 전술한 (S324)에서 흡기온이 최대 흡기온을 초과하면, 제어부는 최대 흡기온을 흡기온으로 설정한다.If the intake air temperature exceeds the maximum intake air temperature (S324) described above, the controller sets the maximum intake air temperature to the intake air temperature.
이와는 달리, 흡기온이 최대 흡기온을 초과하지 않으면 최소 & 최대 흡기온을 시동시 흡기온으로 설정한다.Alternatively, if the intake temperature does not exceed the maximum intake temperature, the minimum & maximum intake temperature is set to the intake temperature at startup.
즉, 제어부는 시작시 흡기온과 실시간 흡기온의 차이를 비교하여 변화가 없고, 시동후 흡기온의 최대/최소 온도를 갱신하고 최대/최소 온도를 비교하여 그 차이값이 일정 온도(E) 미만이면 흡기온 센서 고장으로 판정한다.That is, the control unit compares the difference between the intake air temperature and the real-time intake air temperature at the start, there is no change, and after starting, it updates the maximum / minimum temperature of the intake air temperature and compares the maximum / minimum temperature so that the difference is less than the predetermined temperature (E). If it is, it is determined that the intake air temperature sensor has failed.
즉, 흡기온과 시동시 흡기온의 차이값과 임의의 설정 온도(D)를 비교하고, 실시간 갱신된 최고 흡기온과 실시간 갱신된 최소 흡기온의 차이값과 임의의 설정 온도(E)를 비교한다.That is, the difference between the difference between the intake temperature and the intake temperature at startup and the predetermined set temperature (D), and the difference between the real-time updated maximum intake temperature and the real-time updated minimum intake temperature and the predetermined set temperature (E) do.
흡기온 센서의 자기진단 모니터링(Monitoring) 구간 중 최대/최소 흡기온을 비교함으로써 흡기온 센서 고장 유무를 판별하기 위함이다.This is to determine whether there is a failure of the intake air temperature sensor by comparing the maximum and minimum intake air temperature in the self-diagnostic monitoring section of the intake air temperature sensor.
상기한 바와 같이 본 발명의 실시예는 시동시의 흡기온과 현재의 흡기온을 실시간으로 비교하고, 실시간 갱신된 최소/최대 흡기온 차이의 절대치를 비교하여 모두 만족하면 센서 고장(Fail)으로 판정한다.As described above, the embodiment of the present invention compares the intake temperature at the start-up with the current intake temperature in real time, compares the absolute value of the minimum / maximum intake temperature difference updated in real time, and determines that all are satisfied as a sensor failure. do.
상술한 바와 같이 본 발명에 따른 차량의 흡기온 센서 자기진단 제어방법은 흡기온 센서 자기진단의 예비 조건(Pre-condition)에 차속 조건의 추가로 자기진단 진입 조건을 강화함으로써 흡기온 센서의 오판 판정을 개선할 수 있으며, 북미 강화 OBD 규제를 만족시킬 수 있는 효과가 있다.As described above, the method for controlling the self-diagnosis of the intake air temperature sensor of the vehicle according to the present invention is to determine the misjudgment of the intake air temperature sensor by reinforcing the self-diagnosis entry condition in addition to the pre-condition of the intake air temperature sensor self-diagnosis. In addition, it has the effect of satisfying North American tightened OBD regulations.
도 1은 종래 기술에 따른 차량의 흡기온 센서 자기진단 제어방법을 도시한 흐름도.1 is a flowchart illustrating a method for controlling intake temperature sensor self-diagnosis of a vehicle according to the related art.
도 2는 본 발명의 실시예에 따른 차량의 흡기온 센서 자기진단 제어동작에 따른 신호의 흐름을 도시한 도면.2 is a diagram illustrating a signal flow according to an intake temperature sensor self-diagnosis control operation of a vehicle according to an exemplary embodiment of the present invention.
도 3은 본 발명의 실시예에 따른 차량의 흡기온 센서 자기진단 제어방법을 도시한 흐름도.3 is a flowchart illustrating a method for controlling self-diagnosis of intake air temperature sensors of a vehicle according to an exemplary embodiment of the present invention.
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