KR100680335B1 - Method of detecting a failure of an intake air temperature sensor - Google Patents

Method of detecting a failure of an intake air temperature sensor Download PDF

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KR100680335B1
KR100680335B1 KR1020040057702A KR20040057702A KR100680335B1 KR 100680335 B1 KR100680335 B1 KR 100680335B1 KR 1020040057702 A KR1020040057702 A KR 1020040057702A KR 20040057702 A KR20040057702 A KR 20040057702A KR 100680335 B1 KR100680335 B1 KR 100680335B1
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temperature sensor
condition
failure
intake air
air temperature
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KR1020040057702A
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Korean (ko)
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KR20060008047A (en
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조준관
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현대자동차주식회사
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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
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F02D2200/501—Vehicle speed
    • 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

Abstract

본 발명에 따른 흡기온 센서의 고장 감지 방법은, 미리 설정되어 있는 모니터링 조건을 만족하는지를 판단하는 단계와, 모니터링 조건 만족시 미리 설정되어 있는 판정조건 성립기간 중에 흡기온 센서 전압의 최대값과 최소값을 계측하여 상기 최대값과 최소값의 편차가 미리 설정되어 있는 고장판정 기준값 보다 작은지를 판단하는 단계와; 상기 편차가 고장판정 기준값 보다 작으면 고장판정횟수에 "1"을 더하는 단계와, 상기와 같이 계산된 고장판정횟수가 미리 설정되어 있는 기준횟수 보다 크면 흡기온 센서의 스틱 고장으로 판정하는 단계를 포함하여 구성되어, 흡기온 센서의 전압이 변해야 하는 조건을 만족했음에도 불구하고 흡기온 센서 전압의 최대값과 최소값의 편차가 흡기온 센서의 노이즈 수준 미만일 경우 흡기온 센서의 스틱 고장이 발생한 것으로 판단한다.In the fault detection method of the intake air temperature sensor according to the present invention, the method may include determining whether a preset monitoring condition is satisfied, and determining a maximum value and a minimum value of the intake temperature sensor voltage during a predetermined determination condition establishment period when the monitoring condition is satisfied. Determining whether the deviation between the maximum value and the minimum value is smaller than a predetermined failure determination reference value; And adding "1" to the failure determination frequency when the deviation is smaller than the failure determination reference value, and determining the stick failure of the intake air temperature sensor if the failure determination count calculated as described above is greater than the preset reference frequency. Even though the condition of changing the voltage of the intake temperature sensor is satisfied, it is determined that the stick failure of the intake temperature sensor occurs when the deviation between the maximum value and the minimum value of the intake temperature sensor voltage is less than the noise level of the intake temperature sensor.

Description

흡기온 센서의 고장 감지 방법 {Method of detecting a failure of an intake air temperature sensor} Method of detecting a failure of an intake air temperature sensor             

도 1은 본 발명에 따른 흡기온 센서의 고장 감지 방법의 순서도이다.1 is a flow chart of a failure detection method of the intake air temperature sensor according to the present invention.

본 발명은 흡기온 센서의 고장 감지 방법에 관한 것으로, 좀더 상세하게는 흡기온 센서의 스틱 고장(stick failure)을 판단하기 위한 흡기온 센서의 고장 감지 방법에 관한 것이다.The present invention relates to a failure detection method of the intake air temperature sensor, and more particularly, to a failure detection method of the intake air temperature sensor for determining a stick failure of the intake air temperature sensor.

일반적으로, 차량에는 엔진 제어를 위해 흡기온 센서가 구비되는데, 이러한 흡기온 센서의 전압이 일정 전압을 초과하거나 미만일 경우 흡기온 센서의 단선 및 단락 고장 판정을 하였다.In general, a vehicle is provided with an intake air temperature sensor for controlling the engine. When the voltage of the intake air temperature sensor exceeds or falls below a predetermined voltage, disconnection and short circuit failure of the intake air temperature sensor is determined.

예를 들어, 흡기온 센서의 전압이 4.57V 이상일 경우 센서 소스(source)와 단락된 것으로 판정하며, 흡기온 센서의 전압이 0.2V 이하일 경우 센서 그라운드와 단락 또는 단선된 것으로 판단하는 것이다.For example, when the voltage of the intake temperature sensor is 4.57V or more, it is determined that the sensor source is shorted, and when the voltage of the intake temperature sensor is 0.2V or less, it is determined that the sensor ground is shorted or disconnected.

그러나, 이러한 방법은, 흡기온 센서의 단선 및 단락에 대해서만 고장 판정이 가능하므로, 실제로 흡기온 센서가 스틱(stick) 고장이 발생했을 경우, 흡기온 센서의 고장 판정을 하지 못하므로, 고장난 흡기온 센서로부터 측정된 잘못된 흡기온을 가지고 엔진 관리 시스템 제어시 보정 팩터로 사용하므로, 차량의 운전성에 악영향을 미친다. 즉, 잘못 측정된 흡기온을 가지고 연료량의 흡기온에 따른 보정, 점화시기의 흡기온에 따른 보정 등을 수행함에 따라 차량의 운전성에 악영향을 미치게 되는 것이다.However, this method is capable of failure determination only for disconnection and short circuit of the intake air temperature sensor. Therefore, if the intake air temperature sensor actually fails, the intake air temperature sensor cannot be determined. Since the wrong intake temperature measured from the sensor is used as a correction factor when controlling the engine management system, the driving performance of the vehicle is adversely affected. In other words, the correction of the amount of fuel with the intake temperature and the correction of the intake temperature of the ignition timing with the wrong measured intake temperature adversely affects the driving performance of the vehicle.

또한, 흡기온 센서의 기능상의 고장을 판단하는 로직이 없으므로, 필드에서 흡기온 센서의 스틱 고장이 발생했을 경우, 흡기온 조건을 OBD-Ⅱ 모니터링의 진입조건으로 사용하는 항목에 대해서는 모니터링을 수행할 수 없을 뿐만 아니라, 고장판정 조건이 흡기온에 영향을 받는 항목에 대해서는 정상을 고장으로 오판정하는 경우도 발생할 수 있으므로, OBD 관련 법규에 위배되어 불이익을 받을 소지가 있다.In addition, since there is no logic to determine the functional failure of the intake air temperature sensor, if the stick failure of the intake air temperature sensor occurs in the field, the item that uses the intake air condition as the entry condition for OBD-II monitoring can be monitored. In addition, there may be a case in which the fault determination condition is influenced by the intake air temperature, which may cause a misjudgement of the normal as a failure, and thus may be disadvantageous due to violation of OBD related laws.

이에, 본 발명은 상기와 같은 종래의 제 문제점들을 해소하기 위해 안출된 것으로, 흡기온 센서의 전압이 변해야 하는 조건을 만족했음에도 불구하고 흡기온 센서 전압의 최대값과 최소값의 편차가 흡기온 센서의 노이즈 수준 미만일 경우 흡기온 센서의 스틱 고장이 발생한 것으로 판단하는 흡기온 센서의 고장 감지 방법을 제공하는데 그 목적이 있다.
Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and even though the condition for changing the voltage of the intake temperature sensor is satisfied, the deviation between the maximum value and the minimum value of the intake temperature sensor voltage is It is an object of the present invention to provide a failure detection method of the intake air temperature sensor that determines that a stick failure of the intake air temperature sensor is less than the noise level.

상기한 바와 같은 목적을 달성하기 위한 흡기온 센서의 고장 감지 방법은, 엔진 스톨 및 시동 모드가 아니고, 냉각수온이 미리 설정되어 있는 판정조건 성립온도보다 크고, 수온센서가 정상이고, 흡기온센서의 단선 및 단락이 아닐 경우에 모니터링 조건을 만족하는 것으로 판단하는 모니터링 조건 만족여부 판단 단계와;
상기 모니터링 조건 만족시, 차속이 주행조건 성립차속 보다 큰 상태를 만족하는 전체 누적시간이 주행조건 성립시간 이상이고, 그 후 차량이 정차된 조건을 만족하는 전체 누적시간이 정차조건 성립시간 이상일 때 판정조건이 성립하는 것으로 판단하여, 상기 판정조건이 성립할 때 흡기온 센서 전압의 최대값과 최소값을 계측하여 상기 최대값과 최소값의 편차가 미리 설정되어 있는 고장판정 기준값 보다 작은지를 판단하는 단계와;
상기 편차가 고장판정 기준값 보다 작으면 고장판정횟수에 "1"을 더하는 단계와;
상기 고장판정횟수가 미리 설정되어 있는 기준횟수보다 크면 흡기온 센서의 스틱 고장으로 판정하는 단계 및;
상기 편차가 고장판정 기준값 이상이면 흡기온 센서의 스틱 고장이 아니라고 판단하고 상기 고장판정횟수를 "0"으로 리셋시키는 단계;를 포함하여 구성된다.The failure detection method of the intake air temperature sensor for achieving the above object is not an engine stall and a start-up mode, but the coolant temperature is greater than a predetermined determination condition establishment temperature, the water temperature sensor is normal, and Monitoring condition satisfaction determination step of determining that the monitoring condition is satisfied in the case of disconnection and short circuit;
When the monitoring condition is satisfied, the determination is made when the total cumulative time that satisfies the condition where the vehicle speed is greater than the driving condition establishment speed is greater than or equal to the running condition establishment time, and after that the total cumulative time that satisfies the condition where the vehicle is stopped is equal to or greater than the stopping condition establishment time. Determining that the condition is true, and determining the maximum value and the minimum value of the intake air temperature sensor voltage when the determination condition is satisfied to determine whether the deviation between the maximum value and the minimum value is smaller than a predetermined failure determination reference value;
Adding "1" to the number of failure determinations if the deviation is less than the failure determination reference value;
Determining that the stick failure of the intake air temperature sensor is greater than the predetermined reference number of times;
And determining that it is not a stick failure of the intake air temperature sensor when the deviation is equal to or greater than a failure determination reference value and resetting the failure determination frequency to “0”.

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

도 1은 본 발명에 따른 흡기온 센서의 고장 감지 방법의 순서도이다. 상기 도 1에 도시된 바와 같이, 본 발명에 따른 흡기온 센서의 고장 감지 방법은, 단계(S1)에서 고장판정횟수를 "0"으로 리셋시킨다.1 is a flow chart of a failure detection method of the intake air temperature sensor according to the present invention. As shown in FIG. 1, in the method for detecting a failure of the intake air temperature sensor according to the present invention, the number of failure determinations is reset to “0” in step S1.

이어서, 단계(S2)에서는 미리 설정되어 있는 모니터링 조건을 만족하는지를 판단하여, 모니터링 조건을 만족하면 단계(S3)를 수행한다.Subsequently, in step S2, it is determined whether a preset monitoring condition is satisfied, and if the monitoring condition is satisfied, step S3 is performed.

이때, 상기 모니터링 조건은, 엔진 스톨(Stall) 및 시동 모드가 아니고, 냉각수온센서에 의해 감지된 냉각수온이 미리 설정되어 있는 판정조건 성립온도(예를 들어, 76℃; 엔진의 워밍업 조건) 보다 크고, 리얼 타임 판정에 따른 냉각수온센서가 정상이고, 흡기온센서의 단선 및 단락이 아닐 경우에, 모니터링 조건을 만족하는 것으로 판단한다.In this case, the monitoring condition is not the engine stall and the start mode, but rather than a determination condition establishment temperature (for example, 76 ° C .; warm-up condition of the engine) in which the coolant temperature detected by the coolant temperature sensor is preset. If the cooling water temperature sensor according to the real time determination is large and the disconnection and short circuit of the intake air temperature sensor are not normal, it is determined that the monitoring condition is satisfied.

그리고, 상기 단계(S3)에서는, 미리 설정되어 있는 판정조건이 성립할 때 흡기온 센서 전압의 최대값과 최소값을 계측하여 상기 최대값과 최소값의 편차가 미리 설정되어 있는 고장판정 기준값(예를 들어, 0.2V; 흡기온 센서의 최대 노이즈 전압) 보다 작은지를 판단하여, 고장판정 기준값 보다 작으면 단계(S4)를 수행하고, 고장판정 기준값 이상이면 단계(S7)를 수행한다.In the step S3, when a predetermined determination condition is established, the maximum and minimum values of the intake air temperature sensor voltage are measured, and the failure determination reference value (for example, the deviation between the maximum and minimum values is set in advance). If it is smaller than the failure determination reference value, step S4 is performed, and if it is more than the failure determination reference value, step S7 is performed.

이때, 상기 판정조건 성립조건은, 상기 차속이 주행조건 성립차속(예를 들어, 50Km/h; 주행풍에 의해 흡기온이 떨어질 수 있는 최소한의 차속) 보다 큰 상태를 만족하는 전체 누적시간이 주행조건 성립시간(예를 들어, 60sec; 주행풍에 의해 흡기온이 떨어질 수 있는 최소 시간) 이상이고, 그 후 차량이 정차된 조건(예를 들어, 차속<1.25Km/h)을 만족하는 전체 누적시간이 정차조건 성립시간(예를 들어, 30sec; 주행풍이 없어 흡기온이 상승할 수 있는 최소시간) 이상인 조건을 만족할 때, 판정조건이 성립하는 것으로 판단한다.At this time, the determination condition establishment condition, the total cumulative time that satisfies the state that the vehicle speed is greater than the running condition establishment vehicle speed (for example, 50Km / h; the minimum vehicle speed that the intake air temperature can drop due to the running wind) is running Total cumulative that meets conditions (e.g. 60sec; minimum time that the intake temperature can drop due to running wind) after the condition establishment time (e.g., vehicle speed <1.25 km / h) When the time satisfies a condition equal to or greater than the stop condition establishment time (for example, 30 sec; the minimum time at which the intake temperature can rise due to no running wind), it is determined that the determination condition is satisfied.

상기 단계(S4)에서는 고장판정횟수에 "1"을 더하고, 이어서 단계(S5)에서는 상기와 같이 계산된 고장판정횟수가 미리 설정되어 있는 기준횟수(예를 들어, 5회; 1D/C당 고장 판정 횟수) 보다 큰지를 판단하여 5회 보다 크면 단계(S6)를 수행한다.In step S4, "1" is added to the number of failure determinations, and then in step S5, the number of failure determinations calculated as described above is set in advance (for example, five times; failures per 1D / C). If it is greater than five times, it is determined whether the number is greater than five times.

상기 단계(S6)에서는 흡기온 센서의 스틱 고장으로 판정하고, 상기 단계(S7)에서는 흡기온 센서의 스틱 고장이 아니라고 판단하여 상기 단계(S1)을 수행하여 상기 고장판정횟수를 "0"으로 리셋시킨다.In step S6, it is determined that the stick failure of the intake air temperature sensor is determined, and in step S7, it is determined that it is not a stick failure of the intake air temperature sensor, and the step S1 is performed to reset the failure determination frequency to " 0 ". Let's do it.

즉, 흡기온 센서의 전압이 변화되는 조건이 성립했는데도 불구하고, 흡기온 센서의 전압의 최대값과 최소값의 편차가 흡기온 센서 전압 노이즈(예를 들어, 0.2V) 수준 미만일 경우 흡기온 센서가 스틱 고장난 것으로 판정하는 것이다.That is, despite the condition that the voltage of the intake temperature sensor is changed, if the deviation between the maximum value and the minimum value of the intake temperature sensor is less than the intake temperature sensor voltage noise (for example, 0.2V) level, the intake temperature sensor is It is determined that the stick has failed.

이상에서 설명한 바와 같이 본 발명에 따르면, 흡기온 센서의 전압이 변해야 하는 조건을 만족했음에도 불구하고 흡기온 센서 전압의 최대값과 최소값의 편차가 흡기온 센서의 노이즈 수준 미만일 경우 흡기온 센서의 스틱 고장이 발생한 것으로 판단함으로써, 차량의 운전성을 향상시킬 수 있을 뿐만 아니라 OBD 모니터링을 정확하게 수행할 수 있고, 흡기온 센서로 인한 차량 문제 발생시 정비가 용이하게 하는 효과가 있다.
As described above, according to the present invention, the stick failure of the intake temperature sensor when the deviation between the maximum value and the minimum value of the intake temperature sensor voltage is less than the noise level of the intake temperature sensor even though the condition for changing the voltage of the intake temperature sensor is satisfied. By determining that this has occurred, not only can the driving performance of the vehicle be improved, but also OBD monitoring can be accurately performed, and the maintenance is easy when a vehicle problem occurs due to the intake air temperature sensor.

Claims (4)

엔진 스톨 및 시동 모드가 아니고, 냉각수온이 미리 설정되어 있는 판정조건 성립온도보다 크고, 수온센서가 정상이고, 흡기온센서의 단선 및 단락이 아닐 경우에 모니터링 조건을 만족하는 것으로 판단하는 모니터링 조건 만족여부 판단 단계와;Monitoring condition that judges that the monitoring condition is satisfied when the coolant temperature is not higher than the engine stall and start mode, and the coolant temperature is higher than the preset determination condition, the water temperature sensor is normal, and the disconnection and short circuit of the intake air temperature sensor are not satisfied. Determining whether or not; 상기 모니터링 조건 만족시, 차속이 주행조건 성립차속 보다 큰 상태를 만족하는 전체 누적시간이 주행조건 성립시간 이상이고, 그 후 차량이 정차된 조건을 만족하는 전체 누적시간이 정차조건 성립시간 이상일 때 판정조건이 성립하는 것으로 판단하여, 상기 판정조건이 성립할 때 흡기온 센서 전압의 최대값과 최소값을 계측하여 상기 최대값과 최소값의 편차가 미리 설정되어 있는 고장판정 기준값 보다 작은지를 판단하는 단계와;When the monitoring condition is satisfied, the determination is made when the total cumulative time that satisfies the condition where the vehicle speed is greater than the driving condition establishment speed is greater than or equal to the running condition establishment time, and then the total cumulative time that satisfies the condition where the vehicle is stopped is greater than or equal to the stopping condition establishment time Determining that the condition is true, and determining the maximum value and the minimum value of the intake air temperature sensor voltage when the determination condition is satisfied to determine whether the deviation between the maximum value and the minimum value is smaller than a predetermined failure determination reference value; 상기 편차가 고장판정 기준값 보다 작으면 고장판정횟수에 "1"을 더하는 단계와;Adding "1" to the number of failure determinations if the deviation is less than the failure determination reference value; 상기 고장판정횟수가 미리 설정되어 있는 기준횟수보다 크면 흡기온 센서의 스틱 고장으로 판정하는 단계 및;Determining that the stick failure of the intake air temperature sensor is greater than the predetermined reference number of times; 상기 편차가 고장판정 기준값 이상이면 흡기온 센서의 스틱 고장이 아니라고 판단하고 상기 고장판정횟수를 "0"으로 리셋시키는 단계;Determining that it is not a stick failure of the intake air temperature sensor when the deviation is equal to or greater than a failure determination reference value and resetting the failure determination frequency to "0"; 를 포함하여 구성된 것을 특징으로 하는 흡기온 센서의 고장 감지 방법.Failure detection method of the intake air temperature sensor, characterized in that configured to include. 삭제delete 삭제delete 삭제delete
KR1020040057702A 2004-07-23 2004-07-23 Method of detecting a failure of an intake air temperature sensor KR100680335B1 (en)

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Publication number Priority date Publication date Assignee Title
JPH1061479A (en) * 1996-08-23 1998-03-03 Toyota Motor Corp Abnormality detecting device for air temperature sensor
KR19980046122A (en) * 1996-12-11 1998-09-15 박병재 INTAKE AIR TEMPERATURE SENSOR
KR20010059152A (en) * 1999-12-30 2001-07-06 이계안 Thermistor sensor fail diagnosis method
JP2003028000A (en) * 2001-07-17 2003-01-29 Fuji Heavy Ind Ltd Diagnostic system for intake air temperature sensor for engine
JP2003193902A (en) 2001-12-21 2003-07-09 Mitsubishi Motors Corp Failure determining device for intake air temperature detecting means

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1061479A (en) * 1996-08-23 1998-03-03 Toyota Motor Corp Abnormality detecting device for air temperature sensor
KR19980046122A (en) * 1996-12-11 1998-09-15 박병재 INTAKE AIR TEMPERATURE SENSOR
KR20010059152A (en) * 1999-12-30 2001-07-06 이계안 Thermistor sensor fail diagnosis method
JP2003028000A (en) * 2001-07-17 2003-01-29 Fuji Heavy Ind Ltd Diagnostic system for intake air temperature sensor for engine
JP2003193902A (en) 2001-12-21 2003-07-09 Mitsubishi Motors Corp Failure determining device for intake air temperature detecting means

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