WO2017183410A1 - ステアリングシステムの異音検出方法及びステアリングシステムの評価装置 - Google Patents
ステアリングシステムの異音検出方法及びステアリングシステムの評価装置 Download PDFInfo
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- WO2017183410A1 WO2017183410A1 PCT/JP2017/013227 JP2017013227W WO2017183410A1 WO 2017183410 A1 WO2017183410 A1 WO 2017183410A1 JP 2017013227 W JP2017013227 W JP 2017013227W WO 2017183410 A1 WO2017183410 A1 WO 2017183410A1
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- steering system
- sound
- column shaft
- microphone
- steering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
- G01H1/003—Measuring characteristics of vibrations in solids by using direct conduction to the detector of rotating machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/06—Steering behaviour; Rolling behaviour
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
- G01N29/42—Detecting the response signal, e.g. electronic circuits specially adapted therefor by frequency filtering or by tuning to resonant frequency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/0481—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/014—Resonance or resonant frequency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/101—Number of transducers one transducer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/102—Number of transducers one emitter, one receiver
Definitions
- the present invention relates to a method for detecting abnormal noise of a steering system and a steering system evaluation apparatus.
- the final inspection for abnormal noise caused by the steering system is performed by a test driver inspecting and evaluating the abnormal noise caused by the steering system by distinguishing it from other noises in a vehicle running test.
- tire road noise and engine noise are dominant in the vehicle cabin noise, and the S / N ratio of abnormal noise caused by the steering system is small. Often difficult.
- a microphone or an acceleration is attached to the lower portion of the electric power steering device by repeatedly inputting vibrations to the gear meshing portion and causing the abnormal noise caused by the rotation of the gear meshing portion. It is known to detect with a sensor (see, for example, Patent Document 1).
- An object of the present invention is to provide a method for detecting an abnormal sound of a steering system and an evaluation device for the steering system that can accurately detect an abnormal noise generated from the steering system by increasing the S / N ratio.
- the present invention has the following configuration.
- a method for detecting abnormal noise of a steering system comprising: a column shaft that rotatably supports a steering wheel; and detecting abnormal noise from a steering system that steers wheels according to rotation of the column shaft, Using a microphone disposed facing the column shaft end of the column shaft on the steering wheel side, the sound from the column shaft end is measured,
- An abnormal sound detection method for a steering system wherein an abnormal sound detection signal caused by the steering system is generated from a sound signal output from the microphone.
- An evaluation device for a steering system that includes a column shaft that rotatably supports a steering wheel, and detects abnormal noise from a steering system that steers a wheel according to the rotation of the column shaft, A microphone disposed facing the column shaft end of the column shaft on the steering wheel side; A gantry comprising a vibrator for supporting the steering system and applying vibration; While applying vibration to the pedestal by the vibrator, the sound from the column shaft end is measured using the microphone, and abnormal noise caused by the steering system is detected from the sound signal output from the microphone.
- a steering system evaluation apparatus comprising:
- abnormal noise generated from the steering system can be detected accurately.
- 2 is a spectrogram of a detected audio signal in the first embodiment. It is the spectrogram of the detected audio
- FIG. 1 is a perspective view of a steering system that detects abnormal noise by the abnormal noise detection method of the present invention.
- the traveling direction of the vehicle will be described as the front, and the reverse direction opposite to the traveling direction will be referred to as the rear.
- the steering wheel 13 is supported on the rear end portion of the column shaft 15 so as to be rotatable.
- the column shaft 15 is rotatably supported by the steering column 17 in a state where the cylindrical steering column 17 is inserted in the axial direction.
- the front end portion of the column shaft 15 is connected to the rear end portion of the intermediate shaft 21 via the universal joint 19.
- the front end portion of the intermediate shaft 21 is connected to the input shaft 27 of the steering gear unit 25 via another universal joint 23.
- the steering gear unit 25 transmits the rotation of the input shaft 27 to a pair of left and right steering shafts 29 connected to the front wheels of the vehicle and extending in the vehicle width direction.
- FIG. 2 is a schematic configuration diagram of a steering wheel and a detection device in which a microphone is installed.
- the abnormal noise detection method according to this configuration detects an abnormal noise from the steering system using the microphone 31 and the detection device 33.
- the microphone 31 has a sound collecting unit 35 at the tip, and the sound collecting unit 35 captures sound and outputs a sound signal.
- the microphone 31 for example, various types such as a dynamic microphone and a condenser microphone can be used.
- the microphone 31 is disposed so as to face the steering wheel 13. At that time, the steering wheel 13 removes an attachment member such as an air bag module from the wheel body, and exposes the end 45 of the column shaft 15.
- an attachment member such as an air bag module
- the end portion 54 is a male screw portion is shown, but a configuration in which components attached to the end portion 45 are exposed may be used.
- the microphone 31 is disposed on the vehicle rear side with respect to the column shaft 15, and the sound collection unit 35 of the microphone 31 is disposed at a position facing the end 45 of the column shaft 15.
- the microphone 31 is connected to the detection device 33 via the signal cable 32.
- the detection device 33 includes a frequency analysis unit 37, a rattle sound component extraction unit 39, and an evaluation unit 41.
- the frequency analysis unit 37 performs frequency analysis based on the sound signal output from the microphone 31.
- the rattle sound component extraction unit 39 extracts a rattle sound component resulting from a collision when each component constituting the steering system 11 is relatively displaced from the frequency analysis result by the frequency analysis unit 37.
- the evaluation unit 41 obtains an evaluation value based on the rattle sound component extracted by the rattle sound component extraction unit 39, and evaluates the abnormal sound of the steering system 11.
- FIG. 3 is an explanatory diagram showing details of the arrangement of the microphone 31.
- the distance L between the end portion 45 of the column shaft 15 and the microphone 31 is 50 mm or less.
- the microphone 31 is preferably installed as close as possible to the end 45 of the column shaft 15 so as not to interfere with the column shaft 15, and the distance L is more preferably 10 mm or less.
- the microphone 31 is preferably disposed on the axis X of the column shaft 15. However, if the sound collecting unit 35 faces the end 45 of the column shaft 15, the microphone 31 is inclined with respect to the axis X of the column shaft 15. It may be. For example, although depending on the directivity of the microphone 31, the inclination angle ⁇ from the axis X of the column shaft 15 may be within a range of ⁇ 50 °, preferably ⁇ 30 °.
- the microphone 31 is preferably installed in a state where the space 45 including only the air layer is provided between the end portion 45 of the column shaft 15 and the microphone 31. That is, the microphone 31 is installed in a state where sound is not blocked or hardly blocked from the end 45 of the column shaft 15.
- FIG. 4 is an explanatory view showing one form of abnormal noise detection of a steering system mounted on a vehicle.
- an abnormal noise from the steering system 11 is detected while the vehicle V is running with the steering system 11 mounted on the vehicle V.
- the detection device 33 is operated to drive the vehicle V.
- uneven roads such as cobblestone roads such as Belgian roads and cobblestone roads in which some rounded stones are embedded in the ground regularly or irregularly at a pitch of 10 cm to 100 cm.
- R is run at a speed of 10 km / h to 40 km / h.
- a sound emitted from the end 45 of the column shaft 15 is detected using the microphone 31 while the vehicle V is traveling.
- the microphone 31 outputs the detected sound to the detection device 33 as a sound signal.
- the detection device 33 inputs the sound signal from the microphone 31 to the frequency analysis unit 37 and performs frequency analysis.
- the frequency analysis unit 37 obtains a frequency spectrum that is a sound pressure intensity distribution for each frequency of the sound signal, and outputs the obtained frequency spectrum to the rattle sound component extraction unit.
- the rattle sound component extraction unit 39 extracts a rattle sound component that is an abnormal sound signal caused by the steering system 11 from the frequency spectrum output from the frequency analysis unit 37.
- the rattle sound component extraction unit 39 uses a high-pass filter, a low-pass filter, or a band-pass filter from the input frequency spectrum, and the sound pressure intensity in the frequency band of 300 Hz to 8 kHz with a sense of rattle sound. Are selectively extracted, and the signal is used as an abnormal sound signal. It is more preferable to extract the rattle sound frequency band from 500 Hz to 5 kHz and extract the sound pressure intensity in the frequency band.
- the evaluation unit 41 evaluates the steering system 11 by determining whether or not the sound pressure intensity of the obtained abnormal sound signal is within a preset allowable range, for example.
- the abnormal noise of the steering system 11 is detected by the microphone 31 arranged at the position opposite to the end 45 of the column shaft 15. Since all the components of the steering system 11 are connected to the end portion 45 of the column shaft 15, sound in the steering system 11 is emitted from the end portion 45 of the column shaft 15. By detecting this sound, the noise inside the steering system can be accurately grasped. Since the steering wheel 13 itself amplifies sound using the end portion 45 of the column shaft 15 as a sound source, the microphone 31 is disposed at a position facing the steering wheel 13 to further improve the S / N ratio of the sound signal. be able to.
- the abnormal noise of the steering system 11 can be measured with higher sensitivity.
- FIG. 5 is an explanatory view schematically showing the positional relationship between the column shaft 15 and the microphone 31.
- a space S consisting only of an air layer is formed between the end 45 of the column shaft 15 and the microphone 31.
- the present invention is not limited thereto, and a member 47 such as a sheet or a cover that does not shield sound propagation or has a low shielding effect may be disposed in a part of the space S.
- the member 47 has an effect of passing a specific frequency component including a rattle sound and blocking other frequency components, the signal processing by the rattle sound component extraction unit 39 can be simplified or omitted. .
- the rattle sound is more accurately extracted by selectively extracting the sound pressure intensity in the frequency band of 300 Hz to 8 kHz including the frequency band of the rattle sound caused by the steering system 11 from the sound measured by the microphone 31.
- the noise is always stable and accurate without being affected by other sound components such as tire noise when the vehicle travels. Can be evaluated.
- the support structure of the microphone 31 is not limited as long as the microphone 31 is disposed so as to face the end portion 45 of the column shaft 15.
- the microphone 31 is preferably supported integrally with the steering wheel 13. If the microphone 31 is supported on the steering wheel 13 in this manner, the microphone 31 does not interfere with the operation of the steering wheel 13, and the surrounding members There is no interference.
- the noise from the steering system 11 is measured using only the microphone 31, but the vibration sensor 43 for detecting vibration may be used in combination.
- the vibration sensor 43 is attached to a position connected to the column shaft 15 such as the end 45 of the column shaft 15, and the vibration of the column shaft 15 is detected by the vibration sensor 43.
- the vibration sensor 43 outputs the detected vibration to the detection device 33 as a vibration detection signal.
- the detection device 33 evaluates the input vibration detection signal together with the sound pressure intensity described above.
- vibration sensor 43 various types of sensors such as a MEMS acceleration sensor applying a MEMS (Micro Electro Mechanical System) technology and a piezoelectric acceleration sensor can be used as the acceleration sensor.
- MEMS acceleration sensor applying a MEMS (Micro Electro Mechanical System) technology
- piezoelectric acceleration sensor can be used as the acceleration sensor.
- the detection device 33 may perform evaluation based on the detected vibration intensity, or may perform frequency analysis on the input vibration detection signal and perform evaluation based on the spectrum intensity in a specific frequency band. By using the spectrum intensity, the noise component is reduced, and highly accurate evaluation is possible. In addition, a more reliable evaluation can be performed by a synergistic effect with the evaluation based on the sound pressure intensity.
- FIG. 6 is an explanatory diagram showing an embodiment for detecting an abnormal noise of the steering system alone.
- abnormal noise detection is performed in a state where the steering system 11 is mounted alone on the gantry 51.
- the gantry 51 includes a rectangular bottom plate portion 53, column portions 55 erected at each corner of the bottom plate portion 53, and a frame body 57 fixed to the upper ends of these column portions 55, and the steering system 11. Is supported in the same manner as in-vehicle.
- the gantry 51 is provided with a vibrator 61.
- the vibrator 61 can arbitrarily apply vibration to the steering system 11 supported by the gantry 51. For example, by applying the same vibration pattern to the steering system 11 as that generated when the vehicle V travels, the steering system 11 is imparted with vibration applied during actual traveling while being supported by the gantry 51.
- the portion to which vibration is applied may be the steering shaft 29 that is a tie rod, and the excitation direction may be not only the axial direction of the steering shaft 29 but also the vertical direction.
- the steering gear unit 25 may be vibrated in the vertical direction.
- each of the above parts may be individually excited or simultaneously excited. Thereby, a pseudo driving state can be reproduced in the steering system 11.
- the sound generated from the steering system 11 is measured by using the microphone 31 and the detection device (evaluation device) 33 similar to the configuration shown in FIG. Can be evaluated. Further, the steering system 11 may be evaluated using the microphone 31 and the vibration sensor 43 at the same time. In that case, the reliability of the evaluation result can be further improved.
- the abnormal noise generated from the steering system 11 can be detected accurately and reliably in a situation close to the time when the vehicle V is traveling without mounting the steering system 11 on the vehicle V.
- each of the abnormal noise detection methods described above by arranging the microphone 31 at a position opposite to the end 45 of the column shaft 15, it is possible to reliably detect abnormal noise such as a rattle sound emitted from the steering system 11. In addition, it is possible to accurately detect the rattle sound, which was difficult to detect with the microphone placed at the ear position of the test driver, with an intensity suitable for human hearing. In addition, even when there is no space for installing the microphone 31 below the steering system 11, it can be easily attached to the column shaft 15 and the degree of freedom in abnormal noise inspection can be improved.
- the present invention is not limited to the above-described embodiments, but can be modified by those skilled in the art based on combinations of the configurations of the embodiments, descriptions in the specification, and well-known techniques. Application is also within the scope of the present invention and is within the scope of protection.
- Example 1 a sound emitted from the column shaft 15 was detected using the microphone 31 disposed at a position facing the end 45 of the column shaft 15. The distance L between the column shaft 15 and the microphone 31 was 15 mm. Further, as Comparative Example 1, sound was detected by a microphone placed at the ear position of the test driver.
- FIG. 7 is a spectrogram of the detected sound signal in Example 1
- FIG. 8 is a spectrogram of the detected sound signal in Comparative Example 1.
- an intermittent peak which is a rattle sound component
- Comparative Example 1 As shown in FIG. 7, in Example 1, an intermittent peak, which is a rattle sound component, was detected at 500 Hz to 2000 Hz.
- Comparative Example 1 As shown in FIG. 8, intermittent peaks that are rattle sound components were not clearly detected.
- FIG. 9 is a graph showing average spectra in Example 1 and Comparative Example 1. Comparing the average spectra of Example 1 and Comparative Example 1 from the figure, in Example 1, the dominant peak level at 500 Hz to 2000 Hz is high.
- FIG. 10 is a graph showing a spectrum when the frequency spectrum of the sound pressure of Example 1 shown in FIG. 9 is subjected to a mask process using a bandpass filter.
- the spectral intensity of the rattle sound component can be selectively extracted by performing mask processing with a band pass filter of 300 Hz to 5000 Hz. This makes it possible to diagnose and evaluate rattle sounds in line with human hearing.
- a method for detecting abnormal noise of a steering system comprising: a column shaft that rotatably supports a steering wheel; and detecting abnormal noise from a steering system that steers a wheel according to rotation of the column shaft, Using a microphone disposed facing the column shaft end of the column shaft on the steering wheel side, the sound from the column shaft end is measured,
- An abnormal sound detection method for a steering system wherein an abnormal sound detection signal caused by the steering system is generated from a sound signal output from the microphone.
- the abnormal noise from the steering system is amplified and the S / N ratio is increased. Can be detected in an improved state. Further, since the sound signal of the measured sound has a large S / N ratio, it is possible to easily detect an abnormal sound caused by the steering system.
- An evaluation apparatus for a steering system that includes a column shaft that rotatably supports a steering wheel, and detects abnormal noise from a steering system that steers a wheel according to the rotation of the column shaft, A microphone disposed facing the column shaft end of the column shaft on the steering wheel side; A gantry comprising a vibrator for supporting the steering system and applying vibration; While applying vibration to the pedestal by the vibrator, the sound from the column shaft end is measured using the microphone, and abnormal noise caused by the steering system is detected from the sound signal output from the microphone.
- a steering system evaluation apparatus comprising: According to this steering system evaluation apparatus, it is possible to detect an abnormal noise during traveling of the steering system in a pseudo manner, and to easily evaluate the generated abnormal noise.
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Abstract
Description
また、テストドライバーの耳位置近傍に設置したマイクロホンで音を検出し、その音信号に基づいて評価を行うとしても、ステアリングシステムに起因する異音の成分のみを抽出することは難しいのが実情であった。
(1) ステアリングホイールを回転可能に支持するコラムシャフトを有し、前記コラムシャフトの回転に応じて車輪を転舵させるステアリングシステムからの異音を検出するステアリングシステムの異音検出方法であって、
前記コラムシャフトの前記ステアリングホイール側のコラムシャフト端部に対面して配置されるマイクロホンを用いて、前記コラムシャフト端部からの音を計測し、
前記マイクロホンから出力される音信号から前記ステアリングシステムに起因する異音検出信号を生成する
ステアリングシステムの異音検出方法。
(2) ステアリングホイールを回転可能に支持するコラムシャフトを有し、前記コラムシャフトの回転に応じて車輪を転舵させるステアリングシステムからの異音を検出するステアリングシステムの評価装置であって、
前記コラムシャフトの前記ステアリングホイール側のコラムシャフト端部に対面して配置されるマイクロホンと、
前記ステアリングシステムを支持し、振動を付与する加振器を備える架台と、
前記加振器により前記架台に振動を付与しながら、前記マイクロホンを用いて、前記コラムシャフト端部からの音を計測し、前記マイクロホンから出力される音信号から前記ステアリングシステムに起因する異音検出信号を生成する検出装置と、
を備えるステアリングシステムの評価装置。
図1は本発明の異音検出方法により異音を検出するステアリングシステムの斜視図である。以下、車両の進行方向を前方、進行方向とは反対の後退方向を後方と称して説明する。
コラムシャフト15の端部45とマイクロホン31との間の距離Lは、50mm以下とする。なお、マイクロホン31は、コラムシャフト15と干渉しない程度にコラムシャフト15の端部45に近付けて設置するのが好ましく、距離Lを10mm以下とするのがより好ましい。
<車両走行検査>
まず、ステアリングシステム11を、車両に搭載し、車両と一体にされた状態で異音を検出する形態を説明する。
(異音の検出)
図4は車両に搭載されたステアリングシステムの異音検出の一形態を示す説明図である。図示例の形態においては、ステアリングシステム11を車両Vに搭載した状態で、車両Vを走行させながら、ステアリングシステム11からの異音を検出する。
検出装置33は、マイクロホン31からの音信号を、周波数分析部37に入力し、周波数分析を行う。周波数分析部37は、音信号の周波数毎の音圧強度分布である周波数スペクトルを求め、求めた周波数スペクトルを、ラトル音成分抽出部に出力する。
評価部41は、得られた異音信号の音圧強度が、例えば、予め設定した許容範囲内であるか否かを判断し、ステアリングシステム11を評価する。
例えば、部材47が、ラトル音を含む特定周波数成分を通過させ、他の周波数成分を遮る効果を有していれば、ラトル音成分抽出部39による信号処理を簡単化、又は省略することもできる。
上記例では、マイクロホン31のみを用いてステアリングシステム11からの異音を計測しているが、振動を検出する振動センサ43を併用してもよい。その場合、図3に示すように、振動センサ43をコラムシャフト15の端部45等のコラムシャフト15に接続される位置に取り付け、この振動センサ43によりコラムシャフト15の振動を検出する。振動センサ43は、検出した振動を振動検出信号として検出装置33に出力する。検出装置33は、入力された振動検出信号を前述した音圧強度と併せて評価する。
次に、ステアリングシステム単体の異音を検出する形態を説明する。
図6はステアリングシステム単体の異音を検出する一形態を示す説明図である。図示例の形態においては、ステアリングシステム11を架台51に単体で搭載した状態で異音検出を行う。
図7は実施例1における検出された音信号のスペクトログラムであり、図8は比較例1における検出された音声信号のスペクトログラムである。図7に示すように、実施例1では、500Hz~2000Hzにラトル音成分である断続的なピークが検出された。これに対して比較例1では、図8に示すように、ラトル音成分である断続的なピークが明瞭に検出されなかった。
(1)ステアリングホイールを回転可能に支持するコラムシャフトを有し、前記コラムシャフトの回転に応じて車輪を転舵させるステアリングシステムからの異音を検出するステアリングシステムの異音検出方法であって、
前記コラムシャフトの前記ステアリングホイール側のコラムシャフト端部に対面して配置されるマイクロホンを用いて、前記コラムシャフト端部からの音を計測し、
前記マイクロホンから出力される音信号から前記ステアリングシステムに起因する異音検出信号を生成する
ステアリングシステムの異音検出方法。
このステアリングシステムの異音検出方法によれば、コラムシャフト端部に対面するマイクロホンにより、コラムシャフト端部からの音を計測することで、ステアリングシステムからの異音が増幅されて、S/N比が改善された状態で検出できる。また、計測された音の音信号は、S/N比が大きいため、ステアリングシステムに起因する異音を容易に検出できる。
このステアリングシステムの異音検出方法によれば、実走行時と略同じ状態で異音検出が行え、検出精度を向上できる。
このステアリングシステムの異音検出方法によれば、コラムシャフト端部とマイクロホンとの距離を近付けることで、コラムシャフト端部からの音をより大きな音圧で計測できる。
(4)前記コラムシャフト端部と前記マイクロホンとの間は、空気層のみからなる空間である(1)~(3)のいずれか一つに記載のステアリングシステムの異音検出方法。
このステアリングシステムの異音検出方法によれば、コラムシャフト端部からの音を遮蔽されることなく、そのまま計測できる。
求めた前記周波数スペクトルの300Hz~8kHzの周波数帯のスペクトル強度を抽出した信号を前記異音検出信号とする(1)~(4)のいずれか一つに記載のステアリングシステムの異音検出方法。
このステアリングシステムの異音検出方法によれば、計測された音の音信号からラトル音成分が選択的に抽出されるため、ステアリングシステムの異音をより正確に評価できる。
このステアリングシステムの異音検出方法によれば、ステアリングシステムの車両搭載状態における異音検出が行え、より高精度な評価が行える。
このステアリングシステムの異音検出方法によれば、擬似的にステアリングシステムの走行時の異音を検出でき、発生する異音の評価を簡便に行える。
前記コラムシャフトの前記ステアリングホイール側のコラムシャフト端部に対面して配置されるマイクロホンと、
前記ステアリングシステムを支持し、振動を付与する加振器を備える架台と、
前記加振器により前記架台に振動を付与しながら、前記マイクロホンを用いて、前記コラムシャフト端部からの音を計測し、前記マイクロホンから出力される音信号から前記ステアリングシステムに起因する異音検出信号を生成する検出装置と、
を備えるステアリングシステムの評価装置。
このステアリングシステムの評価装置によれば、擬似的にステアリングシステムの走行時の異音を検出でき、発生する異音の評価を簡便に行える。
13 ステアリングホイール
15 コラムシャフト
29 操舵軸
31 マイクロホン
33 検出装置(評価装置)
45 端部(コラムシャフト端部)
51 架台
61 加振器
S 空間
V 車両
Claims (5)
- ステアリングホイールを回転可能に支持するコラムシャフトを有し、前記コラムシャフトの回転に応じて車輪を転舵させるステアリングシステムからの異音を検出するステアリングシステムの異音検出方法であって、
前記コラムシャフトの前記ステアリングホイール側のコラムシャフト端部に対面して配置されるマイクロホンを用いて、前記コラムシャフト端部からの音を計測し、
前記マイクロホンから出力される音信号から前記ステアリングシステムに起因する異音検出信号を生成する
ステアリングシステムの異音検出方法。 - 前記ステアリングホイールが前記コラムシャフトに取り付けられた状態で行う請求項1に記載のステアリングシステムの異音検出方法。
- 前記ステアリングシステムを搭載した車両を走行させて前記マイクロホンによる音の検出を行う請求項1又は請求項2に記載のステアリングシステムの異音検出方法。
- 加振器を備える架台に搭載された前記ステアリングシステムを、前記加振器により前記架台に振動を付与しながら前記マイクロホンによる音の検出を行う
請求項1又は請求項2に記載のステアリングシステムの異音検出方法。 - ステアリングホイールを回転可能に支持するコラムシャフトを有し、前記コラムシャフトの回転に応じて車輪を転舵させるステアリングシステムからの異音を検出するステアリングシステムの評価装置であって、
前記コラムシャフトの前記ステアリングホイール側のコラムシャフト端部に対面して配置されるマイクロホンと、
前記ステアリングシステムを支持し、振動を付与する加振器を備える架台と、
前記加振器により前記架台に振動を付与しながら、前記マイクロホンを用いて、前記コラムシャフト端部からの音を計測し、前記マイクロホンから出力される音信号から前記ステアリングシステムに起因する異音検出信号を生成する検出装置と、
を備えるステアリングシステムの評価装置。
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BR112018015685-0A BR112018015685A2 (ja) | 2016-04-21 | 2017-03-30 | An allophone detecting method of a steering system, and an evaluation system of a steering system |
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JP6225368B1 (ja) | 2017-11-08 |
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