JPH04342855A - Exhaust gas temperature abnormality detecting device of internal combustion engine - Google Patents
Exhaust gas temperature abnormality detecting device of internal combustion engineInfo
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- JPH04342855A JPH04342855A JP11498591A JP11498591A JPH04342855A JP H04342855 A JPH04342855 A JP H04342855A JP 11498591 A JP11498591 A JP 11498591A JP 11498591 A JP11498591 A JP 11498591A JP H04342855 A JPH04342855 A JP H04342855A
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- exhaust gas
- gas temperature
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- 230000005856 abnormality Effects 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 claims description 13
- 230000002159 abnormal effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
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Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、内燃機関の異常を排気
温度により検出する排気温度異常検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust temperature abnormality detection device for detecting abnormality in an internal combustion engine based on exhaust temperature.
【０００２】0002
【従来の技術】内燃機関の作動中、内燃機関が正常に作
動しているかどうかを判定する方法に、内燃機関の排気
温度から判定する方法がある。この従来の内燃機関にお
ける排気温度異常検出装置は、計測した排気温度をある
特定値と大小判別し、特定値より大きい場合を異常とし
ていた。2. Description of the Related Art During operation of an internal combustion engine, there is a method of determining whether or not the engine is operating normally based on the temperature of the exhaust gas of the engine. This conventional exhaust temperature abnormality detection device for an internal combustion engine distinguishes the measured exhaust temperature from a certain specific value and determines that it is abnormal if it is larger than the specific value.
【０００３】0003
【発明が解決しようとする課題】内燃機関の作動中、排
気温度は負荷と周囲温度の変化の影響が大きく、同じ値
の排気温度でも燃焼における排気温度は異なっている場
合が多く、上記従来の特定値の大小判別では、異常の検
出が不正確である。また、大小判別のための特定値は、
内燃機関の排気温度の正常値と異常値との境界にする必
要があるが、排気温度は負荷や周囲温度により変化する
ため、正常値と異常値との境界が不特定であるため、そ
の設定が困難である。[Problem to be Solved by the Invention] During operation of an internal combustion engine, the exhaust temperature is greatly affected by changes in load and ambient temperature, and even if the exhaust temperature is the same, the exhaust temperature during combustion often differs. Anomaly detection is inaccurate when determining the size of a specific value. In addition, the specific value for size discrimination is
It is necessary to set the boundary between the normal value and abnormal value of the exhaust gas temperature of an internal combustion engine, but since the exhaust temperature changes depending on the load and ambient temperature, the boundary between the normal value and abnormal value is unspecified, so it is difficult to set it. is difficult.
【０００４】本発明は上記実情に鑑みてなされたもので
、負荷や周囲温度の変化の影響を受けず、排気温度の異
常を確実に検出し得る内燃機関の排気温度異常検出装置
を提供することを目的とする。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an exhaust gas temperature abnormality detection device for an internal combustion engine that can reliably detect abnormalities in exhaust gas temperature without being affected by changes in load or ambient temperature. With the goal.
【０００５】[0005]
【課題を解決するための手段】本発明に係る内燃機関の
異常検出装置は、図２に示すように内燃機関の出力を検
出する負荷信号検出器２と、内燃機関の周囲の温度を検
出する周囲温度検出器３と、内燃機関から排気される排
気温度を検出する排気温度検出器４と、上記負荷信号検
出器２により検出された負荷信号及び予め記憶された負
荷−排気温度データに基づいて基準周囲温度での排気温
度を算出する排気温度算出手段１１と、上記周囲温度検
出器３により検出された周囲温度と基準周囲温度との温
度差及び予め記憶している周囲上昇温度−排気上昇温度
データに基づいて排気上昇温度を算出する排気上昇温度
算出手段１３と、この手段１３により算出された排気上
昇温度と上記排気温度算出手段１１により算出された基
準周囲温度での排気温度から推定排気温度を算出する推
定排気温度手段１４と、この手段１４により算出された
推定排気温度と上記排気温度検出器４により検出された
排気温度との温度差を求め、この温度差が設定された値
より小さい場合に正常、大きい状態が設定時間以上継続
した場合に異常と判定する判定手段１６、１８と、この
判定手段１６、１８の判定結果を表示する判定結果表示
器７とを具備したことを特徴とする。[Means for Solving the Problems] As shown in FIG. 2, the abnormality detection device for an internal combustion engine according to the present invention includes a load signal detector 2 for detecting the output of the internal combustion engine, and a load signal detector 2 for detecting the temperature around the internal combustion engine. Based on the ambient temperature detector 3, the exhaust temperature detector 4 that detects the temperature of exhaust gas exhausted from the internal combustion engine, the load signal detected by the load signal detector 2, and the load-exhaust temperature data stored in advance. Exhaust temperature calculation means 11 that calculates the exhaust gas temperature at a reference ambient temperature, and the temperature difference between the ambient temperature detected by the ambient temperature detector 3 and the reference ambient temperature and the ambient temperature rise minus the exhaust gas rise temperature stored in advance. An exhaust gas temperature rise calculation means 13 that calculates the exhaust gas temperature rise based on data, and an estimated exhaust gas temperature based on the exhaust gas temperature rise calculated by this means 13 and the exhaust temperature at the reference ambient temperature calculated by the exhaust temperature calculation means 11. The estimated exhaust gas temperature means 14 calculates the temperature difference between the estimated exhaust temperature calculated by this means 14 and the exhaust temperature detected by the exhaust temperature detector 4, and this temperature difference is smaller than a set value. It is characterized by comprising determining means 16 and 18 which determines that the condition is normal and abnormal if the large condition continues for a set time or more, and a determination result display 7 that displays the determination results of the determining means 16 and 18. do.
【０００６】[0006]
【作用】本発明に係る内燃機関の異常検出装置は、負荷
信号検出器２の検出信号、つまり、内燃機関の出力であ
る負荷信号Ｐを入力し、予め記憶されている負荷−排気
温度データより基準周囲温度ＴＡＯでの排気温度ＴＥＸ
Ｏ を算出する。次に周囲温度検出器３により検出され
た周囲温度信号ＴＡ を入力し、基準周囲温度ＴＡＯと
の差ＴＡＳを求め、周囲上昇温度−排気上昇温度データ
より排気上昇温度ＴＥＸＳ を算出する。以上により算
出された上記排気温度ＴＥＸＯ と上記排気上昇温度Ｔ
ＥＸＳ とにより推定排気温度ＴＥＸＰ を求める。[Operation] The internal combustion engine abnormality detection device according to the present invention inputs the detection signal of the load signal detector 2, that is, the load signal P which is the output of the internal combustion engine, and calculates the load-exhaust temperature data stored in advance. Exhaust temperature TEX at standard ambient temperature TAO
Calculate O. Next, the ambient temperature signal TA detected by the ambient temperature detector 3 is input, the difference TAS from the reference ambient temperature TAO is determined, and the exhaust gas temperature rise TEXS is calculated from the ambient temperature rise minus exhaust gas temperature rise data. The above exhaust gas temperature TEXO and the above exhaust gas rise temperature T calculated as above
Estimated exhaust gas temperature TEXP is determined by EXS.
【０００７】排気温度の実測値は排気温度信号ＴＥＸと
して入力される。そこで、実測値と推定値の差をＴＥＸ
Ｃ として求め、排気温度差ＴＥＸＣの絶対値が許容値
Ａを超えているか否かを判別する。温度差ＴＥＸＣ の
絶対値が許容値Ａを超えると持続時間ｔがカウントされ
、許容値内であると持続時間ｔがリセットされ、正常と
判定される。
また、持続時間ｔが許容時間Ｂを超えると判定結果表示
器７へ異常信号を出力する。The actual measured value of the exhaust gas temperature is input as an exhaust temperature signal TEX. Therefore, the difference between the actual measured value and the estimated value is expressed as TEX.
C, and it is determined whether the absolute value of the exhaust gas temperature difference TEXC exceeds the allowable value A. When the absolute value of the temperature difference TEXC exceeds the tolerance value A, the duration time t is counted, and if it is within the tolerance value, the duration time t is reset and it is determined to be normal. Furthermore, if the duration t exceeds the allowable time B, an abnormality signal is output to the determination result display 7.
【０００８】上記のように内燃機関の出力（負荷）と周
囲温度により推定排気温度を算出し、その値を実際の排
気温度と比較して異常を判定するため、負荷と周囲温度
の変化の影響が大きい排気温度に対してより正確な正常
／異常の判定が可能となる。As described above, the estimated exhaust gas temperature is calculated based on the output (load) of the internal combustion engine and the ambient temperature, and this value is compared with the actual exhaust temperature to determine abnormality, so the influence of changes in the load and ambient temperature is calculated. It is possible to more accurately determine whether the exhaust gas is normal or abnormal when the exhaust temperature is large.
【０００９】[0009]
【実施例】以下、図面を参照して本発明の一実施例を説
明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【００１０】図１は本発明の一実施例に係る内燃機関の
異常検出装置の全体の概略構成を示すブロック図である
。同図において１はＣＰＵで、このＣＰＵ１には、内燃
機関の出力（負荷）を検出して負荷信号Ｐを出力する負
荷信号検出器２、内燃機関の周囲温度を検出して周囲温
度信号ＴＡ を出力する周囲温度検出器３、内燃機関の
排気温度を検出して排気温度信号ＴＥＸを出力する排気
温度検出器４が接続されると共に、ＲＯＭ５、ＲＡＭ６
及び判定結果表示器７が接続される。上記ＲＯＭ５には
正常／異常を判定するためのプログラムが書き込まれ、
ＲＡＭ６には基準周囲温度ＴＡＯ、負荷−排気温度デー
タ、周囲上昇温度−排気上昇温度データ、及び正常／異
常の判定をするための許容値Ａ、許容時間Ｂがデータと
して格納されている。FIG. 1 is a block diagram showing the overall general structure of an abnormality detection device for an internal combustion engine according to an embodiment of the present invention. In the figure, 1 is a CPU, and this CPU 1 includes a load signal detector 2 that detects the output (load) of the internal combustion engine and outputs a load signal P, and a load signal detector 2 that detects the ambient temperature of the internal combustion engine and outputs an ambient temperature signal TA. An ambient temperature detector 3 that outputs an output, an exhaust temperature detector 4 that detects the exhaust temperature of the internal combustion engine and outputs an exhaust temperature signal TEX are connected, and the ROM 5 and RAM 6
and a judgment result display 7 are connected. A program for determining normality/abnormality is written in the ROM5,
The RAM 6 stores as data the reference ambient temperature TAO, load-exhaust temperature data, ambient temperature rise-exhaust temperature rise data, and allowable value A and allowable time B for determining normality/abnormality.
【００１１】上記ＣＰＵ１は、ＲＯＭ５に記憶されたプ
ログラムに従って動作し、各検出器２〜４からの検出デ
ータ及びＲＡＭ６に格納されたデータに基づいて推定排
気温度を算出し、その値を実際の排気温度信号ＴＥＸと
比較して、排気温度の正常／異常を判定し、その判定結
果を判定結果表示器７に出力する。次に上記ＣＰＵ１の
詳細を図２を参照して説明する。The CPU 1 operates according to a program stored in the ROM 5, calculates the estimated exhaust gas temperature based on the detection data from each of the detectors 2 to 4 and the data stored in the RAM 6, and uses that value as the actual exhaust temperature. It compares with the temperature signal TEX to determine whether the exhaust gas temperature is normal or abnormal, and outputs the determination result to the determination result display 7. Next, details of the CPU 1 will be explained with reference to FIG. 2.
【００１２】ＣＰＵ１は、排気温度算出手段１１、周囲
温度差算出手段１２、排気上昇温度算出手段１３、推定
排気温度算出手段１４、排気温度差算出手段１５、排気
温度差判定手段１６、持続時間カウント手段１７、持続
時間判定手段１８により構成される。The CPU 1 includes an exhaust temperature calculation means 11, an ambient temperature difference calculation means 12, an exhaust gas temperature rise calculation means 13, an estimated exhaust temperature calculation means 14, an exhaust temperature difference calculation means 15, an exhaust temperature difference determination means 16, and a duration count. It is composed of a means 17 and a duration determining means 18.
【００１３】排気温度算出手段１１は、負荷信号検出器
２により検出された負荷信号ＰとＲＡＭ６に格納された
基準周囲温度ＴＡＯ及び同基準周囲温度ＴＡＯにおける
負荷−排気温度データにより、基準周囲温度ＴＡＯでの
排気温度ＴＥＸＯ を算出し、推定排気温度算出手段１
４に出力する。The exhaust temperature calculation means 11 calculates the reference ambient temperature TAO based on the load signal P detected by the load signal detector 2, the reference ambient temperature TAO stored in the RAM 6, and the load-exhaust temperature data at the reference ambient temperature TAO. The estimated exhaust gas temperature calculation means 1 calculates the exhaust gas temperature TEXO at
Output to 4.
【００１４】周囲温度差算出手段１２は、周囲温度検出
器３により検出された周囲温度ＴＡと上記基準周囲温度
ＴＡＯとの差ＴＡＳを算出し、排気上昇温度算出手段１
３へ出力する。The ambient temperature difference calculation means 12 calculates the difference TAS between the ambient temperature TA detected by the ambient temperature detector 3 and the reference ambient temperature TAO, and calculates the difference TAS between the ambient temperature TA detected by the ambient temperature detector 3 and the reference ambient temperature TAO.
Output to 3.
【００１５】排気上昇温度算出手段１３は、上記温度差
ＴＡＳとＲＡＭ６に格納された周囲上昇温度−排気上昇
温度データに基づき排気上昇温度ＴＥＸＳを算出し、上
記推定排気温度算出手段１４に出力する。The exhaust gas temperature rise calculation means 13 calculates the exhaust gas temperature rise TEXS based on the temperature difference TAS and the ambient temperature rise-exhaust gas temperature data stored in the RAM 6, and outputs it to the estimated exhaust gas temperature calculation means 14.
【００１６】推定排気温度算出手段１４は、上記排気温
度ＴＥＸＯ と上記排気上昇温度ＴＥＸＳとを加算して
推定排気温度ＴＥＸＰ を算出し、これを排気温度差算
出手段１５に出力する。The estimated exhaust gas temperature calculating means 14 calculates an estimated exhaust gas temperature TEXP by adding the above exhaust gas temperature TEXO and the above exhaust gas rise temperature TEXS, and outputs this to the exhaust gas temperature difference calculating means 15.
【００１７】排気温度差算出手段１５は、上記推定排気
温度ＴＥＸＰ と排気温度検出器４により得られた実際
の排気温度ＴＥＸとを減算して排気温度差ＴＥＸＣ を
算出し、これを排気温度差判定手段１６に出力する。The exhaust gas temperature difference calculating means 15 calculates an exhaust gas temperature difference TEXC by subtracting the estimated exhaust gas temperature TEXP and the actual exhaust gas temperature TEX obtained by the exhaust temperature detector 4, and uses this as an exhaust temperature difference judgment. Output to means 16.
【００１８】排気温度差判定手段１６は、上記排気温度
差ＴＥＸＣ とＲＡＭ６に格納された許容値Ａとの大小
関係を判別する。ここで上記排気温度差ＴＥＸＣ が許
容値Ａを超えた場合、持続時間カウント手段１７にて持
続時間ｔをカウントし、そのカウント値を持続時間判定
手段１８へ出力する。The exhaust gas temperature difference determining means 16 determines the magnitude relationship between the exhaust gas temperature difference TEXC and the allowable value A stored in the RAM 6. If the exhaust gas temperature difference TEXC exceeds the allowable value A, the duration counting means 17 counts the duration t, and outputs the counted value to the duration determining means 18.
【００１９】持続時間判定手段１８は、上記持続時間ｔ
が上記ＲＡＭ６に格納された許容時間Ｂとの長短関係を
判別し、持続時間ｔが許容時間Ｂより短い場合、正常と
判定し、長い場合は異常と判定し、判定結果を判定結果
表示器７に出力する。次に上記実施例における排気温度
異常検出の処理動作を図３のフローチャートを参照して
説明する。The duration determining means 18 determines the duration t.
determines the length relationship between the duration t and the allowable time B stored in the RAM 6, and if the duration t is shorter than the allowable time B, it is determined to be normal, and if it is longer, it is determined to be abnormal, and the determination result is displayed on the determination result display 7. Output to. Next, the processing operation for detecting an abnormality in exhaust temperature in the above embodiment will be explained with reference to the flowchart of FIG.
【００２０】ＣＰＵ１は、ＲＯＭ５に書き込まれたプロ
グラムに基づいて作動し、内燃機関の排気温度の異常検
出処理を行なう。ＣＰＵ１は、まず、ＲＡＭ６に格納さ
れている基準周囲温度ＴＡＯと負荷−排気温度データを
読出して排気温度算出手段１１に入力する（ステップＳ
１ ，Ｓ２ ）。このとき排気温度算出手段１１は、負
荷信号検出器２より入力される内燃機関の出力（負荷）
である負荷信号Ｐを読込み（ステップＳ３ ）、上記基
準周囲温度ＴＡＯ、負荷−排気温度データ及び負荷信号
Ｐにより基準周囲温度ＴＡＯでの排気温度ＴＥＸＯ を
算出し（ステップＳ４ ）、これを推定排気温度算出手
段１４に出力する。The CPU 1 operates based on a program written in the ROM 5, and performs abnormality detection processing of the exhaust gas temperature of the internal combustion engine. The CPU 1 first reads out the reference ambient temperature TAO and the load-exhaust temperature data stored in the RAM 6 and inputs them to the exhaust temperature calculation means 11 (step S
1, S2). At this time, the exhaust temperature calculation means 11 calculates the output (load) of the internal combustion engine inputted from the load signal detector 2.
(step S3), calculates the exhaust gas temperature TEXO at the reference ambient temperature TAO from the reference ambient temperature TAO, load-exhaust temperature data, and load signal P (step S4), and calculates this as the estimated exhaust gas temperature. It is output to the calculation means 14.
【００２１】一方、周囲温度差算出手段１２は、周囲温
度検出器３により検出された内燃機関の周囲温度信号Ｔ
Ａ を読込み（ステップＳ５ ）、この周囲温度信号Ｔ
Ａ から基準周囲温度ＴＡＯを減算して温度差ＴＡＳを
求め（ステップＳ６ ）、排気上昇温度算出手段１３へ
出力する。この排気上昇温度算出手段１３は、ＲＡＭ６
に格納されている周囲上昇温度−排気上昇温度データを
読出し（ステップＳ７ ）、上記温度差ＴＡＳと周囲上
昇温度−排気上昇温度データにより周囲温度差ＴＡＳに
おける排気上昇温度ＴＥＸＳ を算出して（ステップＳ
８ ）、推定排気温度算出手段１４へ出力する。On the other hand, the ambient temperature difference calculating means 12 calculates the ambient temperature signal T of the internal combustion engine detected by the ambient temperature detector 3.
A (step S5), and this ambient temperature signal T
The temperature difference TAS is obtained by subtracting the reference ambient temperature TAO from A (step S6), and is output to the exhaust gas temperature rise calculation means 13. This exhaust gas temperature rise calculating means 13 is stored in the RAM 6
The ambient temperature rise-exhaust temperature rise data stored in is read out (step S7), and the exhaust gas rise temperature TEXS at the ambient temperature difference TAS is calculated from the temperature difference TAS and the ambient temperature rise-exhaust temperature rise data (step S7).
8) and output to the estimated exhaust gas temperature calculation means 14.
【００２２】推定排気温度算出手段１４は、排気上昇温
度ＴＥＸＳ と先に入力された基準周囲温度ＴＡＯでの
排気温度ＴＥＸＯ を加算して推定排気温度ＴＥＸＰ
を求め（ステップＳ９ ）、排気温度差算出手段１５に
入力する。上記推定排気温度算出手段１４により求めた
推定排気温度ＴＥＸＰ は、内燃機関が正常であるとき
の値である。The estimated exhaust gas temperature calculation means 14 adds the exhaust gas temperature rise TEXS and the exhaust gas temperature TEXO at the previously input reference ambient temperature TAO to calculate the estimated exhaust gas temperature TEXP.
is determined (step S9) and input to the exhaust gas temperature difference calculation means 15. The estimated exhaust gas temperature TEXP obtained by the estimated exhaust gas temperature calculation means 14 is a value when the internal combustion engine is normal.
【００２３】この排気温度差算出手段１５は、排気温度
検出器４により検出された内燃機関の実際の排気温度信
号ＴＥＸを読込み（ステップＳ１０）、この排気温度信
号ＴＥＸから上記推定排気温度ＴＥＸＰ を減算して温
度差ＴＥＸＣ を求め（ステップＳ１１）、排気温度差
判定手段１６へ出力する。The exhaust gas temperature difference calculating means 15 reads the actual exhaust gas temperature signal TEX of the internal combustion engine detected by the exhaust temperature detector 4 (step S10), and subtracts the estimated exhaust gas temperature TEXP from this exhaust temperature signal TEX. Then, the temperature difference TEXC is determined (step S11) and outputted to the exhaust gas temperature difference determining means 16.
【００２４】排気温度差判定手段１６は、ＲＡＭ６に格
納されている許容値Ａを読込み（ステップＳ１２）、上
記排気温度差ＴＥＸＣ と許容値Ａとの大小関係を判別
する。
ただし、温度差ＴＥＸＣ が負の値である場合も考えら
れるので、許容値Ａと比較するのは温度差ＴＥＸＣ の
絶対値である。つまり、排気温度差判定手段１６は、温
度差ＴＥＸＣ の絶対値と許容値Ａの大小関係を判別す
る（ステップＳ１３）。ここで、温度差ＴＥＸＣ の絶
対値が許容値Ａより小さい場合、排気温度差判定手段１
６は、排気温度は正常値に保持されていると判断して正
常信号を判定結果表示器７に出力する（ステップＳ１４
）。The exhaust gas temperature difference determining means 16 reads the tolerance value A stored in the RAM 6 (step S12), and determines the magnitude relationship between the exhaust gas temperature difference TEXC and the tolerance value A. However, since it is possible that the temperature difference TEXC is a negative value, it is the absolute value of the temperature difference TEXC that is compared with the tolerance value A. That is, the exhaust gas temperature difference determining means 16 determines the magnitude relationship between the absolute value of the temperature difference TEXC and the allowable value A (step S13). Here, if the absolute value of the temperature difference TEXC is smaller than the allowable value A, the exhaust temperature difference determining means 1
6 determines that the exhaust gas temperature is maintained at a normal value and outputs a normal signal to the determination result display 7 (step S14).
).
【００２５】しかし、温度差ＴＥＸＣ の絶対値が許容
値Ａより大きい場合、排気温度差判定手段１６は、持続
時間カウント手段１７にその判定結果信号、例えば“１
”信号を出力する。持続時間カウント手段１７は、排気
温度差判定手段１６から“１”信号が出力されている間
、カウント動作を行なって持続時間ｔをカウントし（ス
テップＳ１５）、“１”信号が“０”信号に戻った際、
あるいは予め設定した時間を経過した際に、その計測値
を持続時間判定手段１８に出力する。このとき持続時間
判定手段１８は、ＲＡＭ６から許容時間Ｂを読出して持
続時間ｔとの大小関係を判別し（ステップＳ１６，Ｓ１
７）、持続時間ｔが許容時間Ｂより小さい場合は、持続
時間カウント手段１７をリセット（ステップ１８）して
正常信号を判定結果表示器７に出力し（ステップ１４）
、持続時間ｔが許容時間Ｂより大きい場合は、異常信号
を判定結果表示器７に出力する（ステップ１９）。すな
わち、排気温度差ＴＥＸＣ が許容値Ａを越えた場合で
あっても、短い時間であれば正常であると判定する。そ
して、排気温度差ＴＥＸＣ が許容値Ａを越えている状
態が一定時間以上続いた場合に異常であると判定し、そ
の判定結果を判定結果表示器７に出力して異常が発生し
た旨を表示する。However, if the absolute value of the temperature difference TEXC is larger than the allowable value A, the exhaust gas temperature difference determining means 16 sends the determination result signal to the duration counting means 17, for example, "1".
The duration counting means 17 performs a counting operation to count the duration t while the "1" signal is output from the exhaust gas temperature difference determining means 16 (step S15), and outputs the "1" signal. When the signal returns to “0” signal,
Alternatively, when a preset time has elapsed, the measured value is output to the duration determination means 18. At this time, the duration determining means 18 reads the allowable time B from the RAM 6 and determines the magnitude relationship with the duration t (steps S16, S1
7) If the duration t is smaller than the allowable time B, the duration count means 17 is reset (step 18) and a normal signal is output to the determination result display 7 (step 14).
, if the duration t is longer than the allowable time B, an abnormality signal is output to the determination result display 7 (step 19). That is, even if the exhaust gas temperature difference TEXC exceeds the allowable value A, it is determined to be normal for a short period of time. Then, if the exhaust gas temperature difference TEXC exceeds the allowable value A for a certain period of time or more, it is determined that there is an abnormality, and the determination result is output to the determination result display 7 to indicate that an abnormality has occurred. do.
【００２６】以上のような判定方法により、内燃機関の
出力（負荷）と周囲温度の変化の影響が大きい排気温度
に対して、より正確な正常／異常判定結果を導くことが
可能となる。[0026] The above-described determination method makes it possible to derive more accurate normality/abnormality determination results for the exhaust temperature, which is greatly affected by changes in the output (load) of the internal combustion engine and the ambient temperature.
【００２７】[0027]
【発明の効果】以上詳記したように本発明によれば、負
荷と周囲温度の変化の影響が大きい排気温度に対して、
負荷と周囲温度より推定排気温度を算出し、その値を実
際の排気温度と比較し、正常／異常を判定するようにし
たので、より正確な正常／異常の判定が可能となり、こ
れにより排気温度異常検出装置の信頼性が向上する。[Effects of the Invention] As detailed above, according to the present invention, the exhaust temperature, which is greatly affected by changes in load and ambient temperature,
The estimated exhaust temperature is calculated from the load and ambient temperature, and the value is compared with the actual exhaust temperature to determine whether it is normal or abnormal. The reliability of the abnormality detection device is improved.
【図１】本発明の一実施例に係る内燃機関の排気温度異
常検出装置の概略構成を示すブロック図。FIG. 1 is a block diagram showing a schematic configuration of an exhaust gas temperature abnormality detection device for an internal combustion engine according to an embodiment of the present invention.
【図２】同実施例におけるＣＰＵ部分の詳細を示すブロ
ック図。FIG. 2 is a block diagram showing details of a CPU portion in the same embodiment.
【図３】同実施例における排気温度異常検出の処理動作
を示すフローチャート。FIG. 3 is a flowchart showing a processing operation for detecting abnormality in exhaust temperature in the same embodiment.
１…ＣＰＵ、２…負荷信号検出器、３…周囲温度検出器
、４…排気温度検出器、５…ＲＯＭ、６…ＲＡＭ、７…
判定結果表示器、１１…排気温度算出手段、１２…周囲
温度差算出手段、１３…排気上昇温度算出手段、１４…
推定排気温度算出手段、１５…排気温度差算出手段、１
６…排気温度差判定手段、１７…持続時間カウント手段
、１８…持続時間判定手段。1...CPU, 2...Load signal detector, 3...Ambient temperature detector, 4...Exhaust temperature detector, 5...ROM, 6...RAM, 7...
Judgment result display, 11... Exhaust temperature calculation means, 12... Ambient temperature difference calculation means, 13... Exhaust gas temperature rise calculation means, 14...
Estimated exhaust gas temperature calculation means, 15...Exhaust gas temperature difference calculation means, 1
6... Exhaust temperature difference determining means, 17... Duration counting means, 18... Duration determining means.
Claims (1)
出器と、内燃機関の周囲の温度を検出する周囲温度検出
器と、内燃機関から排気される排気温度を検出する排気
温度検出器と、上記負荷信号検出器により検出された負
荷信号及び予め記憶された負荷−排気温度データに基づ
いて基準周囲温度での排気温度を算出する排気温度算出
手段と、 上記周囲温度検出器により検出された周囲
温度と基準周囲温度との温度差及び予め記憶している周
囲上昇温度−排気上昇温度データに基づいて排気上昇温
度を算出する排気上昇温度算出手段と、この手段により
算出された排気上昇温度と上記排気温度算出手段により
算出された基準周囲温度での排気温度から推定排気温度
を算出する推定排気温度算出手段と、この手段により算
出された推定排気温度と上記排気温度検出器により検出
された排気温度との温度差を求め、この温度差が設定さ
れた値より小さい場合に正常、大きい状態が設定時間以
上継続した場合に異常と判定する判定手段と、この判定
手段の判定結果を表示する判定結果表示器とを具備した
ことを特徴とする内燃機関の排気温度異常検出装置。1. A load signal detector that detects the output of an internal combustion engine, an ambient temperature detector that detects the temperature around the internal combustion engine, and an exhaust temperature detector that detects the temperature of exhaust gas exhausted from the internal combustion engine. Exhaust temperature calculation means for calculating the exhaust temperature at a reference ambient temperature based on the load signal detected by the load signal detector and pre-stored load-exhaust temperature data; and the ambient temperature detected by the ambient temperature detector. an exhaust gas temperature rise calculation means for calculating an exhaust gas temperature rise based on the temperature difference between the temperature and a reference ambient temperature and pre-stored ambient temperature rise-exhaust gas temperature data; an estimated exhaust gas temperature calculation means for calculating an estimated exhaust gas temperature from the exhaust gas temperature at a reference ambient temperature calculated by the exhaust temperature calculation means; an estimated exhaust gas temperature calculated by this means; and an exhaust temperature detected by the exhaust temperature detector. a determination means that calculates the temperature difference between 1. An exhaust temperature abnormality detection device for an internal combustion engine, characterized by comprising a display device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11498591A JPH04342855A (en) | 1991-05-20 | 1991-05-20 | Exhaust gas temperature abnormality detecting device of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11498591A JPH04342855A (en) | 1991-05-20 | 1991-05-20 | Exhaust gas temperature abnormality detecting device of internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04342855A true JPH04342855A (en) | 1992-11-30 |
Family
ID=14651497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11498591A Withdrawn JPH04342855A (en) | 1991-05-20 | 1991-05-20 | Exhaust gas temperature abnormality detecting device of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04342855A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008035496A1 (en) * | 2006-09-22 | 2008-03-27 | Nissan Diesel Motor Co., Ltd. | Device and method for detecting abnormality of exhaust gas temperature sensor |
| JP2008180505A (en) * | 2008-04-16 | 2008-08-07 | Hitachi Cable Ltd | Cold water circulation system |
| GB2492355A (en) * | 2011-06-28 | 2013-01-02 | Gm Global Tech Operations Inc | Method for determining the temperature at a specific point in an exhaust pipe of an internal combustion engine |
| WO2015151436A1 (en) * | 2014-03-31 | 2015-10-08 | 株式会社デンソー | Temperature measurement device |
| WO2015151437A1 (en) * | 2014-03-31 | 2015-10-08 | 株式会社デンソー | Temperature measurement device |
| WO2016103463A1 (en) * | 2014-12-26 | 2016-06-30 | 日本郵船株式会社 | Device, program, recording medium, and method for determining device normality and abnormality involving loads |
-
1991
- 1991-05-20 JP JP11498591A patent/JPH04342855A/en not_active Withdrawn
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008076311A (en) * | 2006-09-22 | 2008-04-03 | Nissan Diesel Motor Co Ltd | Abnormality detector for exhaust temperature sensor |
| US8091415B2 (en) | 2006-09-22 | 2012-01-10 | Ud Trucks Corporation | Apparatus for and method of detecting abnormality in exhaust gas temperature sensor |
| US8549902B2 (en) | 2006-09-22 | 2013-10-08 | Ud Trucks Corporation | Apparatus for and method of detecting abnormality in exhaust gas temperature sensor |
| WO2008035496A1 (en) * | 2006-09-22 | 2008-03-27 | Nissan Diesel Motor Co., Ltd. | Device and method for detecting abnormality of exhaust gas temperature sensor |
| JP2008180505A (en) * | 2008-04-16 | 2008-08-07 | Hitachi Cable Ltd | Cold water circulation system |
| GB2492355B (en) * | 2011-06-28 | 2017-01-11 | Gm Global Tech Operations Llc | Method for evaluating an exhaust gas temperature in a exhaust pipe of an internal combustion engine |
| GB2492355A (en) * | 2011-06-28 | 2013-01-02 | Gm Global Tech Operations Inc | Method for determining the temperature at a specific point in an exhaust pipe of an internal combustion engine |
| WO2015151436A1 (en) * | 2014-03-31 | 2015-10-08 | 株式会社デンソー | Temperature measurement device |
| JP2015194440A (en) * | 2014-03-31 | 2015-11-05 | 株式会社デンソー | Temperature measuring device |
| JP2015194439A (en) * | 2014-03-31 | 2015-11-05 | 株式会社デンソー | temperature measuring device |
| WO2015151437A1 (en) * | 2014-03-31 | 2015-10-08 | 株式会社デンソー | Temperature measurement device |
| WO2016103463A1 (en) * | 2014-12-26 | 2016-06-30 | 日本郵船株式会社 | Device, program, recording medium, and method for determining device normality and abnormality involving loads |
| JPWO2016103463A1 (en) * | 2014-12-26 | 2017-04-27 | 日本郵船株式会社 | Apparatus, program, recording medium and method for determining normality / abnormality of apparatus with load |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980806 |