JP4762123B2 - Tire wear amount estimation device and vehicle equipped with tire wear amount estimation device - Google Patents

Tire wear amount estimation device and vehicle equipped with tire wear amount estimation device Download PDF

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JP4762123B2
JP4762123B2 JP2006335883A JP2006335883A JP4762123B2 JP 4762123 B2 JP4762123 B2 JP 4762123B2 JP 2006335883 A JP2006335883 A JP 2006335883A JP 2006335883 A JP2006335883 A JP 2006335883A JP 4762123 B2 JP4762123 B2 JP 4762123B2
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tire
wear amount
wheel
acceleration
tire wear
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JP2008143459A (en
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泰通 若尾
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Bridgestone Corp
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Bridgestone Corp
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Priority to US12/519,067 priority patent/US8493200B2/en
Priority to PCT/JP2007/072508 priority patent/WO2008072453A1/en
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本発明は、タイヤトレッド部の摩耗量を推定する装置に関するものである。   The present invention relates to an apparatus for estimating a wear amount of a tire tread portion.

一般に、タイヤが摩耗すると、その摩耗度合に応じて湿潤路における排水性能が低下するなど、タイヤの性能は大きく変化することから、自動車の安全性を高める上では、路面と接触しているタイヤの状態、特に、その摩耗度合を検知することは重要である。タイヤの摩耗が更に進むと、バーストの危険性も高くなる。
タイヤの摩耗量を推定する方法としては、図４（ａ）〜（ｃ）に示すような、複数の導電ゴム抵抗体５１ａと抵抗体５１ｂを並列に接続した抵抗手段５１とこの抵抗手段５１に直列に接続した直流電源５２を備えたセンサ５３と、このセンサ５３の検出信号をアンテナ５４を介して送信する送信部５５とを備えたタイヤ装着ユニット５０をタイヤトレッド部６０のブロック６１内に埋設して、当該ブロック６１の摩耗に応じて変化する上記抵抗手段５１の抵抗値を検出してタイヤトレッド部６０の摩耗量を推定する方法が提案されている（例えば、特許文献１参照）。
特開２００５−２８９５０号公報 In general, when a tire wears, the performance of the tire changes greatly, such as the drainage performance on wet roads decreases according to the degree of wear, so in order to increase the safety of the automobile, the tire that is in contact with the road surface It is important to detect the condition, in particular its degree of wear. As the tire wears further, the risk of burst increases.
As a method for estimating the wear amount of the tire, as shown in FIGS. 4A to 4C, a resistance means 51 in which a plurality of conductive rubber resistors 51a and a resistor 51b are connected in parallel and the resistance means 51 are used. A tire mounting unit 50 including a sensor 53 including a DC power supply 52 connected in series and a transmission unit 55 that transmits a detection signal of the sensor 53 via an antenna 54 is embedded in a block 61 of the tire tread unit 60. And the method of detecting the resistance value of the said resistance means 51 which changes according to the abrasion of the said block 61, and estimating the abrasion amount of the tire tread part 60 is proposed (for example, refer patent document 1).
JP 2005-28950 A

しかしながら、上記方法では、タイヤトレッド部６０のブロック６１内にアンテナ５４を有する送信部５５を備えたタイヤ装着ユニット５０を埋設してやる必要があるため、タイヤトレッド部６０を加工する必要があった。   However, in the above method, since it is necessary to embed the tire mounting unit 50 including the transmitting unit 55 having the antenna 54 in the block 61 of the tire tread unit 60, it is necessary to process the tire tread unit 60.

本発明は、従来の問題点に鑑みてなされたもので、タイヤトレッド部に加工を施すことなく、タイヤの摩耗量を精度よく計測することのできるタイヤ摩耗量推定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 conventional problems, and an object of the present invention is to provide a tire wear amount estimation device that can accurately measure the wear amount of a tire without processing the tire tread portion. To do.

一般に、タイヤの摩耗が進展するとタイヤ外周は減少するため、同じ対地速度でも車輪の回転速度Ｖw0は増加する。よって、タイヤの摩耗が進展すると同じ車両前後加速度ａxでも車輪回転速度の変化量である車輪回転加速度ａx ＝(ｄＶw0 /ｄｔ)は大きくなる。
本発明者は、鋭意検討の結果、上記車両前後加速度ａxに対する車輪回転加速度ａwの比である加速度比Ｒがタイヤ摩耗量の大きさと高い相関関係を持つことから、上記加速度比Ｒを用いてタイヤの摩耗量を推定するようにすれば、タイヤトレッド部に加工を施すことなく、タイヤの摩耗量を精度よく推定できることを見出し本発明に到ったものである。
すなわち、本願の請求項１に記載の発明は、タイヤの摩耗量を推定する装置であって、車体側に装着された車両前後加速度測定手段と、車輪の回転速度を測定する車輪回転速測定手段と、上記測定された車輪の回転速度の変化量を算出する手段と、上記測定された車両前後加速度と上記算出された車輪回転速度の変化量とからタイヤの摩耗量を推定する摩耗量推定手段とを備えたことを特徴とするものである。
請求項２に記載の発明は、請求項１に記載のタイヤ摩耗量推定装置において、当該車両のタイヤにタイヤ内圧を検知する手段を設けるとともに、上記検知されたタイヤ内圧に基づいて、上記測定された車輪回転速度を補正する補正手段を設けたものである。
請求項３に記載の発明は、請求項１または請求項２に記載のタイヤ摩耗量推定装置において、上記推定されたタイヤ摩耗量が予め設置された所定値を超えた場合に警報を発する警報手段を更に設けたものである。
また、請求項４に記載の車両は、請求項１〜請求項３のいずれかに記載のタイヤ摩耗量推定装置を搭載したことを特徴とするものである。 In general, when tire wear progresses, the outer periphery of the tire decreases, so that the wheel rotation speed V w0 increases even at the same ground speed. Therefore, as the wear of the tire progresses, the wheel rotational acceleration a x = (dV w0 / dt), which is the amount of change in the wheel rotational speed, increases even at the same vehicle longitudinal acceleration a x .
As a result of intensive studies, the present inventor uses the acceleration ratio R because the acceleration ratio R, which is the ratio of the wheel rotational acceleration a w to the vehicle longitudinal acceleration a x , has a high correlation with the amount of tire wear. Thus, the present inventors have found that if the tire wear amount is estimated, the tire wear amount can be accurately estimated without processing the tire tread portion.
That is, the invention according to claim 1 of the present application is an apparatus for estimating the wear amount of a tire, and includes vehicle longitudinal acceleration measuring means mounted on the vehicle body side, and wheel rotational speed measuring means for measuring the rotational speed of the wheel. And means for calculating the measured change amount of the wheel rotational speed, and a wear amount estimating means for estimating the wear amount of the tire from the measured vehicle longitudinal acceleration and the calculated change amount of the wheel rotational speed. It is characterized by comprising.
According to a second aspect of the present invention, in the tire wear amount estimating device according to the first aspect, the tire of the vehicle is provided with means for detecting the tire internal pressure, and the measurement is performed based on the detected tire internal pressure. A correction means for correcting the wheel rotation speed is provided.
According to a third aspect of the present invention, in the tire wear amount estimating device according to the first or second aspect, an alarm means for issuing a warning when the estimated tire wear amount exceeds a predetermined value set in advance. Is further provided.
A vehicle according to a fourth aspect is equipped with the tire wear amount estimating device according to any one of the first to third aspects.

本発明によれば、タイヤ摩耗量推定装置を、車体側に設けられた車両前後加速度を測定する車両前後加速度測定手段と、車輪の回転速度を測定する車輪回転速測定手段と、上記測定された車輪の回転速度の変化量を算出する手段と、上記測定された車両前後加速度と上記算出された車輪回転速度の変化量とからタイヤの摩耗量を推定する摩耗量推定手段とから構成し、車両前後加速度と車輪回転速度の変化量とからタイヤの摩耗量を推定するようにしたので、タイヤトレッド部に加工を施すことなく、タイヤトレッド部の摩耗量を精度よく推定することができる。
このとき、当該車両のタイヤにタイヤ内圧を検知する手段を設け、上記測定された車輪回転速度を上記検知されたタイヤ内圧に基づいて補正するようにすれば、タイヤトレッド部の摩耗量を更に精度よく推定することができる。
また、上記推定されたタイヤ摩耗量が予め設置された所定値を超えた場合に警報を発する警報手段を更に設けるようにすれば、タイヤが不適切な状態になる前に、当該タイヤの状態を、例えば、警報手段等を用いてドライバーに認識させることができる。
更には、上記判定結果を利用して、溝深さ不足によるハイドロプレーニングを未然に防止する対策をとることができるので、安全性が向上する。 According to the present invention, the tire wear amount estimating device is a vehicle longitudinal acceleration measuring means for measuring the vehicle longitudinal acceleration provided on the vehicle body side, a wheel rotational speed measuring means for measuring the rotational speed of the wheel, and the above measurement. A vehicle comprising: means for calculating a change amount of a wheel rotation speed; and a wear amount estimation means for estimating a tire wear amount from the measured vehicle longitudinal acceleration and the calculated wheel rotation speed change amount. Since the wear amount of the tire is estimated from the longitudinal acceleration and the change amount of the wheel rotation speed, the wear amount of the tire tread portion can be accurately estimated without processing the tire tread portion.
At this time, if the tire of the vehicle is provided with a means for detecting the tire internal pressure and the measured wheel rotational speed is corrected based on the detected tire internal pressure, the amount of wear on the tire tread portion can be further improved. Can be estimated well.
Further, if a warning means for issuing a warning when the estimated amount of tire wear exceeds a predetermined value set in advance, the state of the tire is changed before the tire becomes inappropriate. For example, the driver can be made to recognize using an alarm means or the like.
Furthermore, since the above determination result can be used to take measures to prevent hydroplaning due to insufficient groove depth, safety is improved.

以下、本発明の最良の形態について、図面に基づき説明する。
図１は、本最良の形態に係るタイヤ摩耗量推定装置１０の構成を示す機能ブロック図である。同図において、１１は車体側に設置される、対地車両速度の変化を検出する車両前後加速度測定手段、１２は車輪の回転速度を検出する車輪速センサ、１３は当該車両のタイヤのタイヤ気室内の圧力(以下、タイヤ内圧という)を検知する圧力センサ、１４は上記圧力センサ１３で検知されたタイヤ内圧に基づいて上記車輪速センサ１２で検出された車輪回転速度を補正する車輪回転速度補正手段、１５は上記車輪回転速度補正手段１４で補正された車輪回転速度の変化量を算出する車輪回転加速度算出手段、１６は上記車両前後加速度測定手段１１で検出された車両前後加速度ａxと上記車輪回転加速度算出手段１５で算出された車輪回転加速度ａw ＝(ｄＶw/ｄｔ)との比である加速度比Ｒ＝(ａw/ａx)を算出する加速度比算出手段、１７は上記算出された加速度比Ｒから当該タイヤの摩耗量を推定するタイヤ摩耗量推定手段、１８は上記推定された摩耗量が所定の値を超えたときにタイヤの摩耗進行しているという警報を発する警報手段で、車輪回転速度補正手段１４、車輪回転加速度算出手段１５、加速度比算出手段１６、及び、タイヤ摩耗量推定手段１７により、本タイヤ摩耗量推定装置１０の演算部１９を構成する。
本例では、図２に示すように、車両前後加速度測定手段１１と演算部１９とを車体１側に設置するとともに、警報手段１８を運転席の前方に設けられた表示パネル２に取付けるようにしている。また、車輪速センサ１２は図示しないドライブシャフト近傍に、圧力センサ１３はタイヤ３の図示しないホイールのタイヤ気室内側に設置している。
なお、上記車両前後加速度測定手段１１としては加速度センサなどが挙げられる。また、車輪速センサ１２としては閉磁路タイプの磁気センサを用いることができるが、ベアリング一体型のセンサなど、他のタイプのセンサを用いてもよい。また、圧力センサ１３としては、データを車体側に送信する必要があることから、ホイール装着タイプの無線内圧検知装置（ＴＰＭＳ）を用いることが好ましい。 Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 is a functional block diagram showing a configuration of a tire wear amount estimating apparatus 10 according to the best mode. In the figure, 11 is a vehicle longitudinal acceleration measuring means installed on the vehicle body side for detecting a change in the speed of the ground vehicle, 12 is a wheel speed sensor for detecting the rotational speed of the wheel, and 13 is a tire chamber of the tire of the vehicle. A pressure sensor for detecting the pressure of the tire (hereinafter referred to as tire internal pressure), 14 is a wheel rotational speed correcting means for correcting the wheel rotational speed detected by the wheel speed sensor 12 based on the tire internal pressure detected by the pressure sensor 13. , 15 the wheel rotational speed correction means 14 the wheel rotational acceleration calculating means for calculating a change amount of the corrected wheel rotation speed, 16 the vehicle detected vehicle longitudinal acceleration a x and the wheel in the longitudinal acceleration measuring means 11 Acceleration ratio calculating means 17 for calculating an acceleration ratio R = (a w / a x ), which is a ratio to the wheel rotational acceleration a w = (dV w / dt) calculated by the rotational acceleration calculating means 15, A tire wear amount estimation means 18 for estimating the wear amount of the tire from the calculated acceleration ratio R, and issues a warning that the tire wear has progressed when the estimated wear amount exceeds a predetermined value. The alarm means includes the wheel rotation speed correction means 14, the wheel rotation acceleration calculation means 15, the acceleration ratio calculation means 16, and the tire wear amount estimation means 17, and constitutes a calculation unit 19 of the tire wear amount estimation device 10.
In this example, as shown in FIG. 2, the vehicle longitudinal acceleration measuring means 11 and the calculation unit 19 are installed on the vehicle body 1 side, and the alarm means 18 is attached to the display panel 2 provided in front of the driver's seat. ing. Further, the wheel speed sensor 12 is installed in the vicinity of a drive shaft (not shown), and the pressure sensor 13 is installed on the tire chamber side of a wheel (not shown) of the tire 3.
An example of the vehicle longitudinal acceleration measuring means 11 is an acceleration sensor. Further, as the wheel speed sensor 12, a closed magnetic circuit type magnetic sensor can be used, but other types of sensors such as a bearing integrated sensor may be used. Moreover, as the pressure sensor 13, since it is necessary to transmit data to the vehicle body side, it is preferable to use a wheel mounting type wireless internal pressure detection device (TPMS).

次に、本発明のタイヤ摩耗量推定装置１０を用いたタイヤ摩耗量の推定方法について説明する。
まず、車体１側に配置された車両前後加速度測定手段１１により、対地車両の速度変化である車両前後加速度ａxを測定するとともに、車輪速センサ１２により車輪回転速度Ｖw0を測定する。一方、タイヤ内圧が減少するとタイヤ外周も減少する傾向にあることから、本例では、タイヤ３に圧力センサ１３を設置してタイヤ内圧を検知するとともに、車輪回転速度補正手段１４を設けて、上記検知されたタイヤ内圧に基づいて上記測定された車輪回転速度Ｖw0を補正する。以下、補正後の車輪回転速度をＶwとする。
次に車輪回転加速度算出手段１５にて、上記車輪回転速度補正手段１４で補正された車輪回転速度の変化量である車輪回転加速度ａw ＝(ｄＶw/ｄｔ)を算出し、加速度比算出手段１６にて、上記車両前後加速度測定手段１１で検出された車両前後加速度ａxと上記車輪回転加速度ａwとの比である加速度比Ｒ＝(ａw/ａx)を算出する。
タイヤ摩耗量推定手段１７では、新品時の加速度比Ｒ0に対する上記算出された加速度比Ｒの比を求め、この比の値によりタイヤの摩耗量を推定する。タイヤ摩耗量が大きいと上記加速度比Ｒは大きくなるので、例えば、１よりも大きな閾値Ｋ１，Ｋ２を設定して、（Ｒ/Ｒ0）＜Ｋ１ならば摩耗量が小さく、Ｋ１≦（Ｒ/Ｒ0）＜Ｋ２ならば摩耗量が中程度、Ｋ２≦（Ｒ/Ｒ0）ならば摩耗量大、のように摩耗量（磨耗度合）を推定する。
そして、タイヤ摩耗量推定手段１７にて摩耗量大と推定された場合には、警報手段１８にその信号を入力し、表示パネル２に設けられた警報用のＬＥＤを点滅させるなどしてドライバーにタイヤの摩耗が進展していることを認識させる。
タイヤの摩耗が進展すると溝深さ不足するので、水深が浅くてもハイドロプレーニングが起きやすくなる。そこで、タイヤが不適切な状態になる前に、警報手段１８を用いて、当該タイヤの状態をドライバーに認識させるようにすれば、ドライバーはタイヤ交換したりするなどの処置を行うことができるので、車両の安全性を高めることができる。 Next, a tire wear amount estimation method using the tire wear amount estimation apparatus 10 of the present invention will be described.
First, the vehicle longitudinal acceleration measuring means 11 disposed on the vehicle body 1, with measuring the vehicle longitudinal acceleration a x is a change in velocity of the ground vehicle to measure the wheel rotational speed V w0 by the wheel speed sensor 12. On the other hand, when the tire internal pressure decreases, the tire outer periphery also tends to decrease. Therefore, in this example, the pressure sensor 13 is installed in the tire 3 to detect the tire internal pressure, and the wheel rotation speed correction means 14 is provided. The measured wheel rotational speed V w0 is corrected based on the detected tire internal pressure. Hereinafter, the corrected wheel rotation speed is V w .
Next, the wheel rotation acceleration calculation means 15 calculates the wheel rotation acceleration a w = (dV w / dt), which is the amount of change in the wheel rotation speed corrected by the wheel rotation speed correction means 14, and the acceleration ratio calculation means. At 16, an acceleration ratio R = (a w / a x ), which is a ratio between the vehicle longitudinal acceleration a x detected by the vehicle longitudinal acceleration measuring means 11 and the wheel rotational acceleration a w , is calculated.
The tire wear amount estimating means 17 obtains the ratio of the calculated acceleration ratio R to the new acceleration ratio R 0 and estimates the tire wear amount from the value of this ratio. Since the acceleration ratio R increases when the tire wear amount is large, threshold values K1 and K2 greater than 1, for example, are set. If (R / R 0 ) <K1, the wear amount is small, and K1 ≦ (R / If R 0 ) <K2, the wear amount is estimated to be medium, and if K 2 ≦ (R / R 0 ), the wear amount is large.
If the wear amount is estimated to be large by the tire wear amount estimating means 17, the signal is inputted to the alarm means 18, and the alarm LED provided on the display panel 2 is blinked to the driver. Recognize that tire wear is advancing.
When tire wear progresses, the groove depth becomes insufficient, so that hydroplaning is likely to occur even when the water depth is shallow. Therefore, if the driver is made to recognize the state of the tire by using the alarm means 18 before the tire becomes in an inappropriate state, the driver can take measures such as changing the tire. , Can increase the safety of the vehicle.

このように本最良の形態では、車体１側に車両前後加速度測定手段１１を設置し、車体１側にて車両前後加速度ａxを測定するとともに、車輪速センサ１２により車輪回転速度Ｖw0を測定し、これを圧力センサ１３で検知したタイヤ内圧に基づいて補正した車輪回転速度をＶwに変換した後、車輪回転速度Ｖwの変化量である車輪回転加速度ａw＝(ｄＶw/ｄｔ)を算出し、この車輪回転加速度ａwの上記車両前後加速度ａxに対する比である加速度比Ｒ＝(ａw/ａx)を算出し、この加速度比Ｒに基づいてタイヤの摩耗量を推定するようにしたので、タイヤトレッド部に加工を施すことなく、タイヤトレッド部の摩耗量を精度よく推定することができる。 As described above, in this best mode, the vehicle longitudinal acceleration measuring means 11 installed in the vehicle body 1 side, with measuring the vehicle longitudinal acceleration a x in the vehicle body 1 side, measure the wheel rotational speed V w0 by the wheel speed sensor 12 and, after the wheel rotational speed which is corrected based on this internal tire pressure detected by the pressure sensor 13 was converted to V w, the amount of change in the wheel rotation speed V w wheel rotation acceleration a w = (dV w / dt ) , And an acceleration ratio R = (a w / a x ), which is a ratio of the wheel rotational acceleration a w to the vehicle longitudinal acceleration a x , is calculated, and the amount of tire wear is estimated based on the acceleration ratio R. Since it did in this way, the abrasion amount of a tire tread part can be estimated accurately, without processing a tire tread part.

なお、上記最良の形態では、摩耗量を摩耗の度合として大，中，小の３段階に分けたが、閾値を１つにし、タイヤ交換時期をドライバーに知らせるだけの構成としてもよい。
また、摩耗量を摩耗の度合を更に細かく分類することも可能であるが、タイヤの摩耗を調べる目的は、車両の走行安全性にあるので、本例のように３段階程度に分類する方が実用的である。
また、上記加速度比Ｒ＝(ａw/ａx)の摩耗による変化はタイヤ種（外径の違い）によって異なるので、タイヤ種に応じて摩耗量を推定する必要があることはいうまでもない。具体的には、摩耗量を推定する閾値Ｋ１，Ｋ２の値をタイヤ種に応じて設定したり、予めタイヤ種に応じて設定された補正係数を準備しておき、推定された摩耗量を補正するなどの方法を用いるようにすれば、タイヤ種に応じて摩耗量を推定することが可能となる。 In the above-described best mode, the wear amount is divided into three levels of large, medium, and small as the degree of wear. However, a configuration may be adopted in which the threshold is set to one and only the tire replacement time is notified to the driver.
Although it is possible to classify the amount of wear more finely, the purpose of examining the wear of the tire is to drive the vehicle, so it is better to classify it into about three stages as in this example. It is practical.
Further, since the change in the acceleration ratio R = (a w / a x ) due to wear differs depending on the tire type (difference in outer diameter), it is needless to say that the wear amount needs to be estimated according to the tire type. . Specifically, the threshold values K1 and K2 for estimating the wear amount are set according to the tire type, or a correction coefficient set in advance according to the tire type is prepared to correct the estimated wear amount. If a method such as this is used, the wear amount can be estimated according to the tire type.

本発明によるタイヤ摩耗量推定装置を搭載した車両をスムースなアスファルト路面にて走行させ、車両加速度０．２Ｇにおける車両前後加速度ａxと車輪回転速度Ｖw0とを測定した。試験に使用したタイヤは２２５/５５Ｒ１７で、新品(摩耗量ゼロ)、摩耗中期(摩耗量中)、摩耗後期(摩耗量大、残溝２ｍｍ)の各タイヤについて車両前後加速度ａxと車輪回転速度Ｖw0とを測定した。
また、内圧依存性検討のため、一般的な内圧範囲（１５０，２００，２５０ｋＰａ）で新品タイヤのタイヤ内圧と車輪回転速度との関係を調べた。その結果を図３のグラフに示す。このグラフからわかるように、車輪回転速度には内圧依存性があるので、本例のように、測定した車輪回転速度をタイヤ内圧で補正することは有効であることが分かる。
なお、今回用いたタイヤでは、今回の標準状態である２００ｋＰａに対する補正式は以下のようになる。
Ｖw（補正値）＝Ｖw0（計測値）/(1.01−0.000057×圧力値［kPa］)
次に、上記補正式を用いて実測された各タイヤの車輪回転速度Ｖw0を補正して、車輪回転速度補正値Ｖwを求め、この車輪回転速度補正値Ｖwと車両前後加速度ａxとから加速度比を求めた結果を以下の表１に示す。
なお、加速度比の大きさについては、新品タイヤの場合を１０００としたインデックス値で表わした。また、車両前後加速度ａxと車輪回転加速度ａwについては、０．５秒間の平均値を用いた。

Figure 0004762123
表１に示すように、タイヤ摩耗量が大きくなるにつれて加速度比が大きくなり、かつ、新品、摩耗中期、摩耗後期とで加速度比間に有意差があることから、加速度比を求めることにより、タイヤの摩耗度合を精度よく推定できることが確認された。 The vehicle equipped with the tire wear amount estimating apparatus according to the present invention is run at a smooth asphalt road was measured vehicle and the longitudinal acceleration a x and the wheel rotation speed V w0 in vehicle acceleration 0.2 G. The tires used in the test were 225 / 55R17, and the vehicle longitudinal acceleration a x and the wheel rotation speed were measured for new tires (zero wear), middle wear (middle wear), and late wear (large wear, 2 mm remaining groove). V w0 was measured.
Further, in order to examine the dependency on the internal pressure, the relationship between the tire internal pressure of the new tire and the wheel rotation speed was examined in a general internal pressure range (150, 200, 250 kPa). The result is shown in the graph of FIG. As can be seen from this graph, since the wheel rotation speed depends on the internal pressure, it is understood that it is effective to correct the measured wheel rotation speed with the tire internal pressure as in this example.
In the tire used this time, the correction formula for the standard state of 200 kPa is as follows.
V w (correction value) = V w0 (measured value) / (1.01−0.000057 × pressure value [kPa])
Next, the wheel rotational speed V w0 of each tire measured using the above correction formula is corrected to obtain a wheel rotational speed correction value V w , and this wheel rotational speed correction value V w and the vehicle longitudinal acceleration a x Table 1 below shows the result of the acceleration ratio obtained from the above.
In addition, the magnitude of the acceleration ratio is represented by an index value with 1000 as a new tire. Also, the vehicle longitudinal acceleration a x and the wheel rotation acceleration a w, using an average value of 0.5 seconds.
Figure 0004762123
 As shown in Table 1, the acceleration ratio increases as the amount of tire wear increases, and there is a significant difference between the acceleration ratios in the new article, middle wear stage, and late wear stage. It was confirmed that the degree of wear can be accurately estimated.

以上説明したように、本発明によれば、タイヤトレッド部に加工を施すことなく、タイヤトレッド部の摩耗量を精度よく推定することができる。また、当該タイヤの状態を、例えば、警報手段等を用いてドライバーに認識させるなどすれば、車両の走行安全性を向上させることができる。   As described above, according to the present invention, it is possible to accurately estimate the wear amount of the tire tread portion without processing the tire tread portion. In addition, if the driver recognizes the state of the tire using, for example, an alarm means, the driving safety of the vehicle can be improved.

本発明の最良の形態に係るタイヤ摩耗量推定装置の構成を示す機能ブロック図である。It is a functional block diagram which shows the structure of the tire wear amount estimation apparatus which concerns on the best form of this invention. タイヤ摩耗量推定装置に使用される測定手段の配置を示す図である。It is a figure which shows arrangement | positioning of the measurement means used for a tire wear amount estimation apparatus. タイヤ内圧と車輪回転速度との関係を示す図である。It is a figure which shows the relationship between a tire internal pressure and a wheel rotational speed. 従来のタイヤの摩耗量の推定方法を示す図である。It is a figure which shows the estimation method of the abrasion amount of the conventional tire.

符号の説明Explanation of symbols

１ 車体、２ 表示パネル、３ タイヤ、
１０ タイヤ摩耗量推定装置、１１ 車両前後加速度測定手段、１２ 車輪速センサ、
１３ 圧力センサ、１４ 車輪回転速度補正手段、１５ 車輪回転加速度算出手段、
１６ 加速度比算出手段、１７ タイヤ摩耗量推定手段、１８ 警報手段。 1 body, 2 display panel, 3 tires,
10 tire wear amount estimation device, 11 vehicle longitudinal acceleration measuring means, 12 wheel speed sensor,
13 pressure sensors, 14 wheel rotation speed correction means, 15 wheel rotation acceleration calculation means,
16 acceleration ratio calculating means, 17 tire wear amount estimating means, 18 alarm means.

Claims (4)

車体側に装着された車両前後加速度測定手段と、車輪の回転速度を測定する車輪回転速測定手段と、上記測定された車輪の回転速度の変化量を算出する手段と、上記測定された車両前後加速度と上記算出された車輪回転速度の変化量とからタイヤの摩耗量を推定する摩耗量推定手段とを備えたことを特徴とするタイヤ摩耗量推定装置。   Vehicle longitudinal acceleration measuring means mounted on the vehicle body side, wheel rotational speed measuring means for measuring the rotational speed of the wheel, means for calculating a change in the measured rotational speed of the wheel, and the measured vehicle longitudinal speed A tire wear amount estimating device comprising: a wear amount estimating means for estimating a wear amount of a tire from acceleration and the calculated change amount of the wheel rotation speed. 当該車両のタイヤにタイヤ内圧を検知する手段を設けるとともに、上記検知されたタイヤ内圧に基づいて、上記測定された車輪回転速度を補正する補正手段を設けたことを特徴とする請求項１に記載のタイヤ摩耗量推定装置。   2. The vehicle tire according to claim 1, further comprising means for detecting tire internal pressure, and correction means for correcting the measured wheel rotation speed based on the detected tire internal pressure. Tire wear estimation device. 上記推定されたタイヤ摩耗量が予め設置された所定値を超えた場合に警報を発する警報手段を更に設けたことを特徴とする請求項１または請求項２に記載のタイヤ摩耗量推定装置。   3. The tire wear amount estimating apparatus according to claim 1, further comprising alarm means for issuing an alarm when the estimated tire wear amount exceeds a predetermined value set in advance. 請求項１〜請求項３のいずれかに記載のタイヤ摩耗量推定装置を搭載した車両。   A vehicle equipped with the tire wear amount estimation device according to any one of claims 1 to 3.
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US12/519,067 US8493200B2 (en) 2006-12-13 2007-11-21 Apparatus for estimating tire wear amount and a vehicle on which the apparatus for estimating tire wear is mounted
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