JP7287327B2 - Engine valve clearance abnormality detection device and engine valve clearance abnormality detection method - Google Patents

Engine valve clearance abnormality detection device and engine valve clearance abnormality detection method Download PDF

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JP7287327B2
JP7287327B2 JP2020063500A JP2020063500A JP7287327B2 JP 7287327 B2 JP7287327 B2 JP 7287327B2 JP 2020063500 A JP2020063500 A JP 2020063500A JP 2020063500 A JP2020063500 A JP 2020063500A JP 7287327 B2 JP7287327 B2 JP 7287327B2
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engine valve
valve clearance
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JP2021161927A (en
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崇 石川
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Isuzu Motors Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/12—Testing internal-combustion engines by monitoring vibrations

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Description

エンジンバルブのバルブクリアランスの異常を検出するエンジンバルブクリアランス異常検出装置及びエンジンバルブクリアランス異常検出方法に関する。 The present invention relates to an engine valve clearance abnormality detection device and an engine valve clearance abnormality detection method for detecting abnormality in the valve clearance of an engine valve.

エンジン温間時には、エンジンバルブ（具体的には、吸排気バルブ）が燃焼熱で熱膨張する事でエンジン冷間時よりもバルブリフト量が増大するので、エンジン温間時に（即ち、エンジンの通常の運転状態で）最適なバルブリフト量を得るべく、エンジン冷間時には、カムからエンジンバルブに動力を伝達する経路中（例えば、カムとタペットとの間やカムとロッカアームとの間）に規定のバルブクリアランスが存在する。 When the engine is warm, the engine valve (specifically, the intake and exhaust valves) expands due to the heat of combustion, and the valve lift increases more than when the engine is cold. In order to obtain the optimum amount of valve lift when the engine is cold, a specified Valve clearance exists.

特開２００６－３１６７６２号公報Japanese Patent Application Laid-Open No. 2006-316762 特開２０１２－１３２４２０号公報JP 2012-132420 A

然し乍ら、例えば、カムが摩耗すると、バルブクリアランスが規定からズレて異常となり、バルブリフト量が変動してエンジン性能が低下する虞が有るので、バルブクリアランスの異常を検出する事が望ましい。 However, when the cam wears, for example, the valve clearance deviates from the specified value and becomes abnormal, and the valve lift amount fluctuates, which may reduce the engine performance. Therefore, it is desirable to detect the valve clearance abnormality.

以上の事情に鑑み、エンジンバルブのバルブクリアランスの異常を検出する事が可能なエンジンバルブクリアランス異常検出装置及びエンジンバルブクリアランス異常検出方法を提供する事を目的とする。 In view of the above circumstances, it is an object of the present invention to provide an engine valve clearance abnormality detection device and an engine valve clearance abnormality detection method capable of detecting an abnormality in the valve clearance of an engine valve.

エンジンバルブのバルブクリアランスの異常を検出するエンジンバルブクリアランス異常検出装置であって、前記エンジンバルブの駆動音を検出する駆動音検出装置と、前記駆動音検出装置で検出された前記エンジンバルブの駆動音を基に前記バルブクリアランスが異常か否かを判定する異常判定装置と、を備えるエンジンバルブクリアランス異常検出装置を提供する。 An engine valve clearance abnormality detection device for detecting an abnormality in a valve clearance of an engine valve, comprising: a drive sound detection device for detecting a drive sound of the engine valve; and a drive sound of the engine valve detected by the drive sound detection device. and an abnormality determination device for determining whether or not the valve clearance is abnormal based on the above.

前記異常判定装置は、エンジン回転数が低い運転領域では、前記エンジンバルブの駆動音の音圧を基に前記バルブクリアランスが異常か否かを判定する事が望ましい。 It is preferable that the abnormality determination device determines whether or not the valve clearance is abnormal based on the sound pressure of the driving sound of the engine valve in an operating region where the engine speed is low.

前記異常判定装置は、エンジン回転数が高い運転領域では、前記エンジンバルブの駆動音の周波数を基に前記バルブクリアランスが異常か否かを判定する事が望ましい。 Preferably, the abnormality determination device determines whether or not the valve clearance is abnormal based on the frequency of the driving sound of the engine valve in an operating region where the engine speed is high.

また、エンジンバルブのバルブクリアランスの異常を検出するエンジンバルブクリアランス異常検出方法であって、前記エンジンバルブの駆動音を検出するステップと、
検出された前記エンジンバルブの駆動音を基に前記バルブクリアランスが異常か否かを判定するステップと、を備えるエンジンバルブクリアランス異常検出方法を提供する。 Also, an engine valve clearance abnormality detection method for detecting an abnormality in a valve clearance of an engine valve, comprising the step of detecting a driving sound of the engine valve;
and determining whether or not the valve clearance is abnormal based on the detected driving sound of the engine valve.

エンジンバルブのバルブクリアランスの異常を検出する事が可能なエンジンバルブクリアランス異常検出装置及びエンジンバルブクリアランス異常検出方法を提供する事が出来る。 It is possible to provide an engine valve clearance abnormality detection device and an engine valve clearance abnormality detection method capable of detecting an abnormality in the valve clearance of an engine valve.

エンジンバルブクリアランス異常検出装置の構成を説明する図である。It is a figure explaining the structure of an engine valve clearance abnormality detection apparatus. エンジンバルブクリアランス異常検出装置の動作を説明する図である。It is a figure explaining operation|movement of an engine valve clearance abnormality detection apparatus.

［構成］
図１に示す様に、エンジンバルブクリアランス異常検出装置１００は、エンジンバルブ１０１のバルブクリアランス１０２の異常を検出するものであって、駆動音検出装置１０３と、異常判定装置１０４と、を備える。 [composition]
As shown in FIG. 1, the engine valve clearance abnormality detection device 100 detects abnormality in the valve clearance 102 of the engine valve 101, and includes a driving sound detection device 103 and an abnormality determination device 104.

エンジンバルブ１０１は、吸排気バルブである。バルブクリアランス１０２は、例えば、カム１０５で揺動されるロッカアーム１０６とエンジンバルブ１０１との間に存在するものであって、ロッカアーム１０６に取り付けられたアジャストスクリュ１０７で調整される。 The engine valve 101 is an intake/exhaust valve. A valve clearance 102 exists, for example, between a rocker arm 106 oscillated by a cam 105 and the engine valve 101 , and is adjusted by an adjusting screw 107 attached to the rocker arm 106 .

駆動音検出装置１０３は、エンジンバルブ１０１の駆動音を検出するものであって、例えば、エンジンバルブ１０１の駆動音を効率的に集音する事が可能な指向性マイクで実現される。 The drive sound detection device 103 detects the drive sound of the engine valve 101, and is realized by, for example, a directional microphone capable of efficiently collecting the drive sound of the engine valve 101. FIG.

異常判定装置１０４は、駆動音検出装置１０３で検出されたエンジンバルブ１０１の駆動音を基にバルブクリアランス１０２が異常か否かを判定するものであって、例えば、電子制御装置１０８の一部機能で実現される。 The abnormality determination device 104 determines whether or not the valve clearance 102 is abnormal based on the driving sound of the engine valve 101 detected by the driving sound detection device 103. is realized by

具体的には、異常判定装置１０４は、駆動音検出装置１０３で検出されたエンジンバルブ１０１の駆動音を、バルブクリアランス１０２が規定からズレていない場合のエンジンバルブ１０１の駆動音と比較する事で、バルブクリアランス１０２が異常か否かを判定する。エンジンバルブ１０１の駆動音は、例えば、音圧、周波数、及び／又は波形を記録する事で比較を可能とする。 Specifically, the abnormality determination device 104 compares the drive sound of the engine valve 101 detected by the drive sound detection device 103 with the drive sound of the engine valve 101 when the valve clearance 102 does not deviate from the regulation. , to determine whether the valve clearance 102 is abnormal. The driving sound of the engine valve 101 can be compared by recording sound pressure, frequency and/or waveform, for example.

バルブクリアランス１０２が規定からズレていない場合のエンジンバルブ１０１の駆動音は、例えば、予め実機による実験を通じて記録しておく。また、バルブクリアランス１０２を調整した後の所定のエンジン駆動時間に亘って駆動音検出装置１０３で検出されたエンジンバルブ１０１の駆動音を機械学習する事で、バルブクリアランス１０２が規定からズレていない場合のエンジンバルブ１０１の駆動音を特定しても良い。 The drive sound of the engine valve 101 when the valve clearance 102 does not deviate from the regulation is recorded in advance through experiments using an actual machine, for example. In addition, when the valve clearance 102 does not deviate from the regulation by machine learning the driving sound of the engine valve 101 detected by the driving sound detection device 103 over a predetermined engine driving time after the valve clearance 102 is adjusted. , the driving sound of the engine valve 101 may be specified.

異常判定装置１０４は、エンジン回転数が低い運転領域では、エンジンバルブ１０１の駆動音の音圧（音の大きさ）を基にバルブクリアランス１０２が異常か否かを判定すると共に、エンジン回転数が高い運転領域では、エンジンバルブ１０１の駆動音の周波数（音の高さ）を基にバルブクリアランス１０２が異常か否かを判定する。尚、エンジン回転数は、エンジン回転数センサ１０９で検出される。 The abnormality determination device 104 determines whether or not the valve clearance 102 is abnormal based on the sound pressure (loudness) of the driving sound of the engine valve 101 in an operating region where the engine speed is low. In the high operating region, it is determined whether or not the valve clearance 102 is abnormal based on the frequency (pitch) of the drive sound of the engine valve 101 . Incidentally, the engine speed is detected by an engine speed sensor 109 .

エンジン回転数が低い運転領域では、エンジンバルブ１０１の開閉速度が遅く、エンジンバルブ１０１の駆動音の周波数が低いので、エンジンバルブ１０１の開閉速度が少しでも変動すると、エンジンバルブ１０１の駆動音の周波数の変動に与える影響が大きく、エンジンバルブ１０１の駆動音の比較が正確に行い難い。 In the operating region where the engine speed is low, the opening/closing speed of the engine valve 101 is slow and the frequency of the driving sound of the engine valve 101 is low. , and it is difficult to accurately compare the drive sounds of the engine valves 101 .

従って、エンジン回転数が低い運転領域では、エンジンバルブ１０１の駆動音の音圧を、バルブクリアランス１０２が規定からズレていない場合のエンジンバルブ１０１の駆動音の音圧と比較する事で、バルブクリアランス１０２が異常か否かを判定する事が望ましい。 Therefore, in the operating region where the engine speed is low, by comparing the sound pressure of the driving sound of the engine valve 101 with the sound pressure of the driving sound of the engine valve 101 when the valve clearance 102 does not deviate from the regulation, the valve clearance It is desirable to determine whether 102 is abnormal.

また、エンジン回転数が高い運転領域では、エンジンバルブ１０１の開閉速度が速く、エンジンバルブ１０１の駆動音の周波数が高いので、エンジンバルブ１０１の開閉速度が多少変動しても、エンジンバルブ１０１の駆動音の周波数の変動に与える影響が小さい。 In addition, in an operating region where the engine speed is high, the opening and closing speed of the engine valve 101 is high, and the frequency of the driving sound of the engine valve 101 is high. It has little influence on the fluctuation of sound frequency.

従って、エンジン回転数が高い運転領域では、エンジンバルブ１０１の駆動音の周波数を、バルブクリアランス１０２が規定からズレていない場合のエンジンバルブ１０１の駆動音の周波数と比較する事で、バルブクリアランス１０２が異常か否かを正確に判定する事が出来る。 Therefore, in the operating region where the engine speed is high, by comparing the frequency of the drive sound of the engine valve 101 with the frequency of the drive sound of the engine valve 101 when the valve clearance 102 does not deviate from the regulation, the valve clearance 102 is Whether or not there is an abnormality can be accurately determined.

尚、エンジン回転数が低い運転領域とエンジン回転数が高い運転領域との区分は、例えば、エンジン回転数が閾値以上であればエンジン回転数が高い運転領域とし、エンジン回転数が閾値未満であればエンジン回転数が低い運転領域とする。 It should be noted that the division between the operating region with a low engine speed and the operating region with a high engine speed is, for example, an operating region with a high engine speed if the engine speed is greater than or equal to a threshold value, and an operating region with a high engine speed if the engine speed is less than the threshold value. If so, the operating range is set to a low engine speed.

エンジンバルブ１０１の駆動音を比較する際に、エンジンバルブ１０１の駆動音の音圧を基にした方が周波数を基にするよりもバルブクリアランス１０２が異常か否かを正確に判定する事が出来るエンジン回転数を予め実験で決定しておき、これを閾値として設定する。 When comparing the drive sound of the engine valve 101, whether or not the valve clearance 102 is abnormal can be determined more accurately based on the sound pressure of the drive sound of the engine valve 101 than based on the frequency. The engine speed is determined in advance by experiment, and this is set as the threshold value.

また、エンジンバルブクリアランス異常検出装置１００は、異常判定装置１０４でバルブクリアランス１０２が異常と判定された場合に、バルブクリアランス１０２の異常を、エンジンの操作者（例えば、エンジンが搭載された車両を運転する者）、管理者（例えば、エンジンが搭載された車両を管理する者）、及び／又は作業者（例えば、エンジンが搭載された車両を整備する者）へ通知しても良い。 In addition, when the abnormality determination device 104 determines that the valve clearance 102 is abnormal, the engine valve clearance abnormality detection device 100 detects abnormality in the valve clearance 102 by an engine operator (for example, a person driving a vehicle equipped with an engine). (for example, a person who manages a vehicle equipped with an engine), and/or a worker (for example, a person who maintains a vehicle equipped with an engine).

通知は、例えば、エンジンが搭載された車両のインジケータや画面を通じて表示したり、通信回線を通じてエンジンが搭載された車両から離れたサービスセンタに居る管理者の情報端末に表示したり、エンジンが搭載された車両の近くに居る作業者の情報端末に表示したりする事で行われる。尚、定置されたエンジンでは、エンジンの稼働状態を表示するインジケータや画面を通じて表示する事で通知を行う事が出来る。 The notification may be displayed, for example, through an indicator or screen on the vehicle in which the engine is installed, or may be displayed in the information terminal of an administrator located in a service center away from the vehicle in which the engine is installed through a communication line. This is done by displaying it on the information terminal of the worker near the vehicle. In the case of a stationary engine, notification can be given by displaying the operating status of the engine through an indicator or a screen.

［動作］
図２に示す様に、エンジンバルブクリアランス異常検出装置１００は、ステップＳ１０１で、駆動音検出装置１０３がエンジンバルブ１０１の駆動音を検出するか、異常判定装置１０４が駆動音検出装置１０３で検出されたエンジンバルブ１０１の駆動音を読み込む。 [motion]
As shown in FIG. 2, in the engine valve clearance abnormality detection device 100, in step S101, the drive sound detection device 103 detects the drive sound of the engine valve 101, or the abnormality determination device 104 detects the drive sound detection device 103. The driving sound of the engine valve 101 is read.

次のステップＳ１０２では、異常判定装置１０４が、エンジン回転数センサ１０９で検出されたエンジン回転数が閾値以上か否かを判定し、閾値以上の場合はステップＳ１０３に進み、閾値未満の場合はステップＳ１０４に進む。 In the next step S102, the abnormality determination device 104 determines whether or not the engine speed detected by the engine speed sensor 109 is equal to or greater than the threshold. Proceed to S104.

ステップＳ１０３では、異常判定装置１０４が、駆動音検出装置１０３で検出されたエンジンバルブ１０１の駆動音の周波数を、バルブクリアランス１０２が規定からズレていない場合のエンジンバルブ１０１の駆動音の周波数と比較し、両者が所定の類似範囲に有る場合は、バルブクリアランス１０２が正常と判定し、そうでなければバルブクリアランス１０２が異常と判定する。 In step S103, the abnormality determination device 104 compares the frequency of the drive sound of the engine valve 101 detected by the drive sound detection device 103 with the frequency of the drive sound of the engine valve 101 when the valve clearance 102 does not deviate from the regulation. If both are within a predetermined similarity range, it is determined that the valve clearance 102 is normal, otherwise it is determined that the valve clearance 102 is abnormal.

また、ステップＳ１０４では、異常判定装置１０４が、駆動音検出装置１０３で検出されたエンジンバルブ１０１の駆動音の音圧を、バルブクリアランス１０２が規定からズレていない場合のエンジンバルブ１０１の駆動音の音圧と比較し、両者が所定の類似範囲に有る場合は、バルブクリアランス１０２が正常と判定し、そうでなければバルブクリアランス１０２が異常と判定する。 In step S104, the abnormality determination device 104 determines the sound pressure of the driving sound of the engine valve 101 detected by the driving sound detecting device 103 as the sound pressure of the driving sound of the engine valve 101 when the valve clearance 102 does not deviate from the regulation. When compared with the sound pressure, if both are within a predetermined similar range, it is determined that the valve clearance 102 is normal, otherwise it is determined that the valve clearance 102 is abnormal.

尚、エンジンバルブ１０１の駆動音は、バルブクリアランス１０２が同一であっても、他の要因で僅かに変動する虞が有るので、その変動を考慮して類似範囲を予め特定しておき、エンジンバルブ１０１の駆動音を比較した際の乖離がその範囲内であれば、駆動音検出装置１０３で検出されたエンジンバルブ１０１の駆動音と予め記録されたエンジンバルブ１０１の駆動音とが一致すると判定すれば良い。 Even if the valve clearance 102 is the same, the driving sound of the engine valve 101 may vary slightly due to other factors. If the divergence when comparing the driving sounds of 101 is within that range, it is determined that the driving sound of the engine valve 101 detected by the driving sound detection device 103 matches the previously recorded driving sound of the engine valve 101. Good luck.

以上に説明した様に、エンジンバルブクリアランス異常検出装置１００によれば、エンジンバルブのバルブクリアランスの異常を検出する事が出来る。 As described above, according to the engine valve clearance abnormality detection device 100, an abnormality in the valve clearance of the engine valve can be detected.

１００ エンジンバルブクリアランス異常検出装置
１０１ エンジンバルブ
１０２ バルブクリアランス
１０３ 駆動音検出装置
１０４ 異常判定装置
１０５ カム
１０６ ロッカアーム
１０７ アジャストスクリュ
１０８ 電子制御装置
１０９ エンジン回転数センサ 100 engine valve clearance abnormality detection device 101 engine valve 102 valve clearance 103 drive sound detection device 104 abnormality determination device 105 cam 106 rocker arm 107 adjusting screw 108 electronic control device 109 engine speed sensor

Claims (2)

エンジンバルブのバルブクリアランスの異常を検出するエンジンバルブクリアランス異常検出装置であって、
前記エンジンバルブの駆動音を検出する駆動音検出装置と、
前記駆動音検出装置で検出された前記エンジンバルブの駆動音を基に前記バルブクリアランスが異常か否かを判定する異常判定装置と、
を備え、
前記異常判定装置は、エンジン回転数が低い運転領域では、前記エンジンバルブの駆動音の音圧を基に前記バルブクリアランスが異常か否かを判定する
事を特徴とするエンジンバルブクリアランス異常検出装置。 An engine valve clearance abnormality detection device for detecting an abnormality in the valve clearance of an engine valve,
a drive sound detection device for detecting the drive sound of the engine valve;
an abnormality determination device that determines whether or not the valve clearance is abnormal based on the driving sound of the engine valve detected by the driving sound detection device;
with
The abnormality determination device determines whether or not the valve clearance is abnormal based on the sound pressure of the driving sound of the engine valve in an operating region where the engine speed is low.
An engine valve clearance abnormality detection device characterized by: エンジンバルブのバルブクリアランスの異常を検出するエンジンバルブクリアランス異常検出装置であって、 An engine valve clearance abnormality detection device for detecting an abnormality in the valve clearance of an engine valve,
前記エンジンバルブの駆動音を検出する駆動音検出装置と、 a drive sound detection device for detecting the drive sound of the engine valve;
前記駆動音検出装置で検出された前記エンジンバルブの駆動音を基に前記バルブクリアランスが異常か否かを判定する異常判定装置と、 an abnormality determination device that determines whether or not the valve clearance is abnormal based on the driving sound of the engine valve detected by the driving sound detection device;
を備え、 with
前記異常判定装置は、エンジン回転数が高い運転領域では、前記エンジンバルブの駆動音の周波数を基に前記バルブクリアランスが異常か否かを判定する The abnormality determination device determines whether or not the valve clearance is abnormal based on the frequency of the driving sound of the engine valve in an operating region where the engine speed is high.
事を特徴とするエンジンバルブクリアランス異常検出装置。 An engine valve clearance abnormality detection device characterized by:
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Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2000257456A (en) 1999-03-10 2000-09-19 Toyota Motor Corp Electromagnetic drive valve
JP2001021455A (en) 1999-07-07 2001-01-26 Fuji Heavy Ind Ltd Engine-diagnosing apparatus
JP2003214944A (en) 2002-01-29 2003-07-30 Daihatsu Motor Co Ltd Failure inspection device depending on abnormal noise

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AT397579B (en) * 1982-05-12 1994-05-25 List Hans VALVE CLEARANCE CONTROL DEVICE
JPS639833A (en) * 1986-07-01 1988-01-16 Ube Ind Ltd Abnormality diagnosing method for valve part of internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000257456A (en) 1999-03-10 2000-09-19 Toyota Motor Corp Electromagnetic drive valve
JP2001021455A (en) 1999-07-07 2001-01-26 Fuji Heavy Ind Ltd Engine-diagnosing apparatus
JP2003214944A (en) 2002-01-29 2003-07-30 Daihatsu Motor Co Ltd Failure inspection device depending on abnormal noise

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