JP2003146037A - Tire pressure drop detecting method and device and program for tire decompression determination - Google Patents
Tire pressure drop detecting method and device and program for tire decompression determinationInfo
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- JP2003146037A JP2003146037A JP2001348533A JP2001348533A JP2003146037A JP 2003146037 A JP2003146037 A JP 2003146037A JP 2001348533 A JP2001348533 A JP 2001348533A JP 2001348533 A JP2001348533 A JP 2001348533A JP 2003146037 A JP2003146037 A JP 2003146037A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はタイヤ空気圧低下検
出方法および装置、ならびにタイヤ減圧判定のプログラ
ムに関する。さらに詳しくは、タイヤの減圧を高精度に
検出することができるタイヤ空気圧低下検出方法および
装置、ならびにタイヤ減圧判定のプログラムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire pressure drop detecting method and apparatus, and a tire pressure reduction determination program. More specifically, the present invention relates to a tire pressure drop detecting method and apparatus capable of detecting a tire pressure reduction with high accuracy, and a tire pressure reduction determination program.
【０００２】[0002]
【従来の技術および発明が解決しようとする課題】従来
より、車両に装着された４輪タイヤの回転（車輪速）情
報からタイヤの減圧を検出するタイヤ空気圧低下検出装
置（ＤＷＳ）がある。この装置は、タイヤが減圧すると
正常内圧のタイヤより外径（タイヤの動荷重半径）が減
少するため、他の正常なタイヤに比べると回転速度や回
転角速度が増加するという原理を用いている。たとえば
タイヤの回転角速度の相対的な差から内圧低下を検出す
る方法（特開昭６３−３０５０１１号公報参照）では、
判定値ＤＥＬとして、
ＤＥＬ＝｛（Ｆ１＋Ｆ４）／２−（Ｆ２＋Ｆ３）／２｝
／｛（Ｆ１＋Ｆ２＋Ｆ３＋Ｆ４）／４｝×１００（％）
を用いている。ここで、Ｆ１〜Ｆ４は、それぞれ前左タ
イヤ、前右タイヤ、後左タイヤおよび後右タイヤの回転
角速度である。2. Description of the Related Art Conventionally, there is a tire pressure drop detecting device (DWS) for detecting a tire pressure reduction from rotation (wheel speed) information of a four-wheel tire mounted on a vehicle. This device uses the principle that when the tire is depressurized, the outer diameter (the dynamic load radius of the tire) is smaller than that of the tire having the normal inner pressure, and therefore the rotation speed and the rotation angular velocity are increased as compared with other normal tires. For example, in the method of detecting the decrease in internal pressure from the relative difference in the rotational angular velocities of the tires (see Japanese Patent Laid-Open No. 63-305011),
As the determination value DEL, DEL = {(F1 + F4) / 2- (F2 + F3) / 2}
/ {(F1 + F2 + F3 + F4) / 4} × 100 (%) is used. Here, F1 to F4 are rotational angular velocities of the front left tire, the front right tire, the rear left tire, and the rear right tire, respectively.
【０００３】たとえば自然に空気圧が漏れるなどの場合
には、４輪タイヤが同時に減圧することがある。For example, when the air pressure naturally leaks, the four-wheel tires may be decompressed at the same time.
【０００４】しかしながら、従来の方法は４輪の対角に
ある回転角速度の和同士の差から減圧判定しているた
め、４輪タイヤの同時減圧を検出することができない。
このため、減圧しているとわからず、走行を続けること
により、タイヤの転がり抵抗の増加による燃費の悪化、
ひいてはバーストにつながるという問題がある。However, in the conventional method, since the pressure reduction is determined from the difference between the sums of the rotational angular velocities diagonally of the four wheels, the simultaneous pressure reduction of the four-wheel tires cannot be detected.
For this reason, it is not known that the pressure is reduced, and by continuing running, deterioration of fuel efficiency due to increase in rolling resistance of tires,
As a result, there is a problem that it leads to a burst.
【０００５】本発明は、叙上の事情に鑑み、１輪タイヤ
の減圧を検出することができるとともに、４輪タイヤの
同時減圧を検出し、減圧判定の精度を向上させることが
できるタイヤ空気圧低下検出方法および装置、ならびに
タイヤ減圧判定のプログラムを提供することを目的とす
る。In view of the above circumstances, the present invention is capable of detecting the pressure reduction of a one-wheel tire and simultaneously detecting the pressure reduction of four-wheel tires to improve the accuracy of pressure reduction determination. It is an object of the present invention to provide a detection method and apparatus, and a tire decompression determination program.
【０００６】[0006]
【課題を解決するための手段】本発明のタイヤ空気圧低
下検出方法は、車両に装着したタイヤから得られる回転
情報に基づいてタイヤの内圧低下を検出するタイヤ空気
圧低下検出方法であって、前記各タイヤの回転情報を検
出する工程と、前記各タイヤの回転情報から車輪速度を
演算する工程と、前記各タイヤの車輪速度を記憶する工
程と、前記車両の絶対速度を計測する工程と、当該計測
された車両の絶対速度と前記各タイヤの車輪速度とを比
較し、タイヤの空気圧低下を判定する工程を含むことを
特徴とする。The tire pressure drop detecting method of the present invention is a tire air pressure drop detecting method for detecting a tire internal pressure drop based on rotation information obtained from a tire mounted on a vehicle. A step of detecting the rotation information of the tire, a step of calculating the wheel speed from the rotation information of each tire, a step of storing the wheel speed of each tire, a step of measuring the absolute speed of the vehicle, and the measurement It is characterized by including a step of comparing the absolute speed of the vehicle and the wheel speed of each of the tires, and determining a decrease in the air pressure of the tire.
【０００７】また、本発明のタイヤ空気圧低下検出装置
は、車両に装着したタイヤから得られる回転情報に基づ
いてタイヤの内圧低下を検出するタイヤ空気圧低下検出
装置であって、前記各タイヤの回転情報を検出する回転
情報検出手段と、該各タイヤの回転情報から車輪速度を
演算する演算手段と、該各タイヤの車輪速度を記憶する
記憶手段と、前記車両の絶対速度を計測する計測手段
と、当該計測された車両の絶対速度と前記各タイヤの車
輪速度とを比較し、タイヤの空気圧低下を判定する減圧
判定手段とを備えてなることを特徴とする。The tire air pressure drop detecting device of the present invention is a tire air pressure drop detecting device for detecting a decrease in tire internal pressure based on rotation information obtained from a tire mounted on a vehicle. A rotation information detecting means for detecting the wheel speed, a calculating means for calculating the wheel speed from the rotation information of each tire, a storage means for storing the wheel speed of each tire, and a measuring means for measuring the absolute speed of the vehicle, It is characterized by comprising decompression determining means for comparing the measured absolute velocity of the vehicle with the wheel velocity of each tire to determine a decrease in tire air pressure.
【０００８】さらに本発明のタイヤ減圧判定のプログラ
ムは、タイヤの空気圧低下を判定するためにコンピュー
タを、各タイヤの回転情報から車輪速度を演算する演算
手段、該各タイヤの車輪速度を記憶する記憶手段、前記
車両の絶対速度を計測する計測手段、当該計測された車
両の絶対速度と前記各タイヤの車輪速度とを比較し、タ
イヤの空気圧低下を判定する減圧判定手段として機能さ
せることを特徴とする。Further, the tire decompression determination program of the present invention uses a computer for determining a decrease in tire air pressure, computing means for computing wheel speed from rotation information of each tire, and memory for storing the wheel speed of each tire. Means, measuring means for measuring the absolute speed of the vehicle, comparing the measured absolute speed of the vehicle and the wheel speed of each tire, and functioning as a decompression determining means for determining a decrease in tire air pressure, To do.
【０００９】[0009]
【発明の実施の形態】以下、添付図面に基づいて、本発
明のタイヤ空気圧低下検出方法および装置、ならびにタ
イヤ減圧判定のプログラムを説明する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a tire pressure drop detecting method and apparatus of the present invention, and a tire pressure reducing judgment program will be described with reference to the accompanying drawings.
【００１０】図１に示すように、本発明の一実施の形態
にかかわるタイヤ空気圧低下検出装置は、たとえば４輪
車両に備えられた４つのタイヤＦＬ、ＦＲ、ＲＬおよび
ＲＲ（以下、総称してＷｉという。ここで、ｉ＝１〜
４、１：前左タイヤ、２：前右タイヤ、３：後左タイ
ヤ、４：後右タイヤ）の空気圧が低下しているか否かを
検出するもので、タイヤＷｉにそれぞれ関連して設けら
れた通常の回転情報検出手段１を備えている。As shown in FIG. 1, a tire pressure drop detecting device according to an embodiment of the present invention includes four tires FL, FR, RL and RR (hereinafter, collectively referred to as "four-wheel vehicle"). Wi, where i = 1 to
(4, 1: front left tire, 2: front right tire, 3: rear left tire, 4: rear right tire) is used to detect whether or not the air pressure has dropped, and is provided in association with each tire Wi. Also, the normal rotation information detecting means 1 is provided.
【００１１】前記回転情報検出手段１としては、電磁ピ
ックアップなどを用いて回転パルスを発生させてパルス
の数から車輪速度（回転速度）を測定する車輪速センサ
またはダイナモのように回転を利用して発電を行ない、
この電圧から車輪速度を測定するものを含む角速度セン
サなどを用いることができる。前記回転情報検出手段１
の出力はＡＢＳ（アンチロックブレーキシステム）など
のコンピュータである制御ユニット２に与えられる。制
御ユニット２には、空気圧が低下したタイヤＷｉを知ら
せるための液晶表示素子、プラズマ表示素子またはＣＲ
Ｔなどで構成された低μ路警報表示器３、およびドライ
バーによって操作することができる初期化スイッチ４が
接続されている。As the rotation information detecting means 1, a rotation speed is generated by using an electromagnetic pickup or the like to generate a rotation pulse and measure the wheel speed (rotation speed) from the number of pulses. To generate electricity,
An angular velocity sensor or the like including one that measures the wheel velocity from this voltage can be used. The rotation information detecting means 1
Is given to a control unit 2 which is a computer such as an ABS (antilock brake system). The control unit 2 includes a liquid crystal display element, a plasma display element, or a CR for notifying the tire Wi of which the air pressure has dropped.
A low μ road warning indicator 3 composed of T etc. and an initialization switch 4 which can be operated by a driver are connected.
【００１２】制御ユニット２は、図２に示されるよう
に、外部装置との信号の受け渡しに必要なＩ／Ｏインタ
ーフェイス２ａと、演算処理の中枢として機能するＣＰ
Ｕ２ｂと、該ＣＰＵ２ｂの制御動作プログラムが格納さ
れたＲＯＭ２ｃと、前記ＣＰＵ２ｂが制御動作を行なう
際にデータなどが一時的に書き込まれたり、その書き込
まれたデータなどが読み出されるＲＡＭ２ｄとから構成
されている。As shown in FIG. 2, the control unit 2 has an I / O interface 2a required for exchanging signals with an external device, and a CP functioning as a center of arithmetic processing.
It comprises a U2b, a ROM 2c in which a control operation program for the CPU 2b is stored, and a RAM 2d for temporarily writing data or reading the written data when the CPU 2b performs a control operation. There is.
【００１３】前記回転情報検出手段１では、タイヤＷi
の回転数に対応したパルス信号（以下、車輪速パルスと
いう）が出力される。またＣＰＵ２ｂでは、回転情報検
出手段１から出力された車輪速パルスに基づき、所定の
サンプリング周期ΔＴ(sec)、たとえばΔＴ＝１秒ごと
に各タイヤＷiの回転角速度Ｆiが算出される。In the rotation information detecting means 1, the tire W i
A pulse signal (hereinafter referred to as a wheel speed pulse) corresponding to the number of revolutions is output. Further, the CPU 2b calculates the rotational angular velocity F i of each tire W i at a predetermined sampling period ΔT (sec), for example, ΔT = 1 second, based on the wheel speed pulse output from the rotation information detecting means 1.
【００１４】ここで、タイヤＷiは、規格内でのばらつ
き（初期差異）が含まれて製造されるため、各タイヤＷ
iの有効転がり半径（一回転により進んだ距離を２πで
割った値）は、すべてのタイヤＷiがたとえ正常内圧で
あっても、同一とは限らない。そのため、各タイヤＷi
の回転角速度Ｆiはばらつくことになる。そこで、初期
差異によるばらつきを打ち消すために補正した回転角速
度Ｆ１iを算出する。具体的には、
Ｆ１1＝Ｆ1
Ｆ１2＝ｍＦ2
Ｆ１3＝Ｆ3
Ｆ１4＝ｎＦ4
と補正される。前記補正係数ｍ、ｎは、たとえば車両が
直線走行していることを条件として回転角速度Ｆiを算
出し、この算出された回転角速度Ｆiに基づいて、ｍ＝
Ｆ1／Ｆ2、ｎ＝Ｆ3／Ｆ4として得られる。そして、前記
Ｆ１iに基づき、各車輪のタイヤの車輪速度Ｖｉを算出
する。Here, since the tires W i are manufactured with variations (initial differences) within the specifications included, the tires W i are
The effective rolling radius of i (a value obtained by dividing the distance traveled by one rotation by 2π) is not necessarily the same even if all the tires W i have normal internal pressure. Therefore, each tire W i
The rotational angular velocity F i of fluctuates. Therefore, the rotational angular velocity F1 i corrected to cancel the variation due to the initial difference is calculated. Specifically, F1 1 = F 1 F1 2 = mF 2 F1 3 = F 3 F1 4 = nF 4 is corrected. For the correction coefficients m and n, for example, the rotational angular velocity F i is calculated under the condition that the vehicle is traveling straight, and m = m based on the calculated rotational angular velocity F i.
Obtained as F 1 / F 2 , n = F 3 / F 4 . Then, the wheel speed Vi of the tire of each wheel is calculated based on the F1 i .
【００１５】４輪タイヤの同時減圧は、ＡＢＳの制御に
使用している推定車体速度と４輪タイヤの各車輪速度を
比較して判定することができる。しかしながら、この推
定車体速度は、あくまでも車両の推定速度であるので、
路面から見た実際の車両速度とは異なり、正確に４輪タ
イヤの同時減圧を判定することは難しい。Simultaneous decompression of four-wheel tires can be determined by comparing the estimated vehicle speed used for ABS control with each wheel speed of the four-wheel tires. However, since this estimated vehicle speed is just the estimated vehicle speed,
Unlike the actual vehicle speed seen from the road surface, it is difficult to accurately determine the simultaneous decompression of the four-wheel tires.
【００１６】そこで、減圧判定の精度を向上させるため
に、本実施の形態では、前記各タイヤＷｉの回転情報を
検出する回転情報検出手段１と、前記各タイヤＷｉの回
転情報から車輪速度を演算する演算手段と、該各タイヤ
の車輪速度を記憶する記憶手段と、前記車両の絶対速度
を計測する計測手段と、当該計測された車両の絶対速度
と前記各タイヤの車輪速度とを比較し、タイヤの空気圧
低下を判定する減圧判定手段とを備えている。Therefore, in order to improve the accuracy of the pressure reduction determination, in this embodiment, the wheel speed is calculated from the rotation information detecting means 1 for detecting the rotation information of each tire Wi and the rotation information of each tire Wi. Computing means, storage means for storing the wheel speed of each tire, measuring means for measuring the absolute speed of the vehicle, comparing the measured absolute speed of the vehicle and the wheel speed of each tire, And a decompression determining means for determining a decrease in tire air pressure.
【００１７】そして、本実施の形態におけるタイヤ減圧
判定のプログラムは、制御ユニット２を、各タイヤの回
転情報から車輪速度を演算する演算手段、該各タイヤの
車輪速度を記憶する記憶手段、前記車両の絶対速度を計
測する計測手段、当該計測された車両の絶対速度と前記
各タイヤの車輪速度とを比較し、タイヤの空気圧低下を
判定する減圧判定手段として機能させる。In the tire decompression determination program according to the present embodiment, the control unit 2 controls the calculating means for calculating the wheel speed from the rotation information of each tire, the storing means for storing the wheel speed of each tire, and the vehicle. Of the absolute speed of the vehicle, and the measured absolute speed of the vehicle and the wheel speed of each tire are compared to function as a decompression determining means for determining a decrease in the air pressure of the tire.
【００１８】路面から見た車両の絶対速度は、たとえば
ＩＴＳ（Intelligent Transport Systems：高度道路交
通システム）によりわかる。なお、ＩＴＳとは、カー・
ナビゲーション・システムなど自動車をインテリジェン
ト化するシステムと、広域交通管制システムなど道路を
インテリジェント化するするシステムを融合させたマル
チメディア時代の交通システムであり、現在、各省庁が
連携してＩＴＳ構築にあたっている。またはＡＨＳ（Au
tomated Highway System：自動運転道路システム）など
により求めることができる。ＡＨＳとは、道路と自動車
の協調により、危険警告や運転補助を行なって安全な走
行を支援するシステムである。The absolute speed of the vehicle viewed from the road surface can be known by, for example, ITS (Intelligent Transport Systems). ITS is a car
It is a transportation system in the multimedia era that fuses systems that intelligentize automobiles such as navigation systems with systems that intelligentize roads such as wide area traffic control systems. Currently, ministries and agencies are working together to build ITS. Or AHS (Au
tomated Highway System: Automated driving road system). The AHS is a system that cooperates with roads and automobiles to provide danger warnings and driving assistance to support safe driving.
【００１９】前記絶対速度には、ＧＰＳ（全地球測位シ
ステム）と時間により計測できる絶対速度や、路面埋め
込みセンサと通過時間から計測できる絶対速度などがあ
る。たとえば道路の一定区間に埋め込まれた磁気マーカ
を、図１〜２に示されるように、車両側に備えられた磁
気センサ５が通過することで時間と距離により算出する
ことができる。The absolute speed includes an absolute speed that can be measured by GPS (Global Positioning System) and time, and an absolute speed that can be measured by a road surface embedded sensor and passage time. For example, as shown in FIGS. 1 and 2, a magnetic marker embedded in a certain section of a road can be calculated from time and distance by passing a magnetic sensor 5 provided on the vehicle side.
【００２０】前記ＧＰＳを用いる場合、送受信機、たと
えばＧＰＳアンテナなどを使用したカーナビゲーション
装置などの車両位置検出手段を備える必要がある。When using the GPS, it is necessary to provide a vehicle position detecting means such as a car navigation device using a transceiver, for example, a GPS antenna.
【００２１】つぎに図３に基づいて本実施の形態にかか
わるタイヤ空気圧低下検出装置の動作について説明す
る。Next, the operation of the tire pressure drop detecting device according to this embodiment will be described with reference to FIG.
【００２２】まずＡＢＳセンサなどのセンサから得られ
た車両の各車輪タイヤのある時点の車輪速データを用い
て、車両の４輪タイヤのそれぞれの車輪速度Ｖｉ（ｉ：
１〜４）を計算する（ステップＳ１）。そして、たとえ
ばＩＴＳにより車両の絶対速度Ｖを計測する（ステップ
Ｓ２）。ＩＴＳにより正しい車両車速（車両の絶対速
度）がわかれば、各車輪タイヤの車輪速度Ｖｉを補正な
どする必要性はないので、各車輪速度Ｖｉと車両の絶対
速度ＳＶとの大小関係を直接比較し、各タイヤがどのよ
うな状態であるかを判断する（ステップＳ３）。ついで
車両の絶対速度ＳＶより大きい（速い）車輪速度、たと
えばＶ１があれば、現在車両が直線走行をしているか否
かを判断する（ステップＳ４）。ここで、タイヤの回転
角速度は、初期差異によるばらつきだけでなく、たとえ
ば車両がコーナーを走行するときのコーナー内側のタイ
ヤの旋回半径とコーナー外側のタイヤの旋回半径との差
（以下、タイヤ旋回半径差という）および車両の荷重移
動によってもばらつく。すなわち車両の荷重移動によっ
て、コーナー内側のタイヤの有効ころがリ半径およびコ
ーナー外側のタイヤの有効ころがり半径が、それぞれ
（１＋β×横方向加速度Ｇ）おとび（１−β×横方向加
速度Ｇ）に示した分だけ変動するので、回転角速度はこ
れらに示した分に対応するようにばらつくことになる。
なお、定数βは、（車両の荷重×車両の重心の地面から
の高さ×タイヤの有効転がり半径の変動率）／（キング
ピン間の距離（トレッド幅）×１００）から求めること
ができる。したがって、たとえば旋回半径計算処理にて
車両の荷重移動に起因するばらつきを排除した車両の旋
回半径が計算され、ついで該旋回半径に基づいて、タイ
ヤ旋回半径差に起因するばらつきを排除するように、算
出された初期補正後の回転角速度から車輪速度が補正さ
れる（ステップＳ５）。ついでＴ時間以上、車輪速度Ｖ
ｉ（ｉ＝１）が絶対速度ＳＶより所定値、たとえば１０
秒間以上、差が０．０３をこえる大きさであれば、当該
タイヤは減圧していると判断して、警報を発する（ステ
ップＳ６、Ｓ７）。Ｔ時間までに車輪速度Ｖｉ（ｉ＝
１）が絶対速度ＳＶに等しくなっていればタイヤは減圧
していないと判断する。また、前記ステップＳ３におい
て、４輪タイヤの各車輪速度Ｖｉ（ｉ＝１〜４）が車両
の絶対速度ＳＶより大きい場合についても同様なステッ
プＳ４〜６により、４輪減圧も判定することができる。
また、本実施の形態では、前記ステップＳ３において、
４輪タイヤのうち、たとえば車輪速度Ｖｉ（ｉ＝２、
４）が車両の絶対速度ＳＶより大きい場合についても同
様なステップＳ４〜６により、４輪車両の同サイド（右
側）の２輪タイヤの同時減圧も検出することができる。First, using the wheel speed data of each wheel tire of the vehicle at a certain time obtained from a sensor such as an ABS sensor, each wheel speed Vi (i:
1 to 4) are calculated (step S1). Then, for example, the absolute speed V of the vehicle is measured by ITS (step S2). If the correct vehicle speed (absolute speed of the vehicle) is known from the ITS, it is not necessary to correct the wheel speed Vi of each wheel tire. Therefore, the magnitude relationship between each wheel speed Vi and the absolute speed SV of the vehicle is directly compared. The state of each tire is determined (step S3). Then, if there is a wheel speed higher (higher) than the absolute speed SV of the vehicle, for example, V1, it is determined whether or not the vehicle is currently traveling straight (step S4). Here, the rotational angular velocity of the tire is not only the variation due to the initial difference, but also the difference between the turning radius of the tire inside the corner and the turning radius of the tire outside the corner when the vehicle travels in the corner (hereinafter, tire turning radius). Difference) and the load movement of the vehicle. That is, the effective rolling radius of the tire inside the corner and the effective rolling radius of the tire outside the corner are respectively (1 + β × lateral acceleration G) and (1-β × lateral acceleration G) due to the load movement of the vehicle. Since it changes by the indicated amount, the rotational angular velocity will vary corresponding to the indicated amount.
The constant β can be calculated from (vehicle load × height of vehicle center of gravity from the ground × rate of change in effective rolling radius of tire) / (distance between kingpins (tread width) × 100). Therefore, for example, the turning radius of the vehicle is calculated in the turning radius calculation process by eliminating the variation caused by the load movement of the vehicle, and then the variation caused by the tire turning radius difference is eliminated based on the turning radius. The wheel speed is corrected from the calculated rotational angular speed after initial correction (step S5). Then, T time or more, wheel speed V
i (i = 1) is a predetermined value from the absolute speed SV, for example, 10
If the difference exceeds 0.03 for a second or more, it is determined that the tire is decompressed and an alarm is issued (steps S6 and S7). Wheel speed Vi (i =
If 1) is equal to the absolute speed SV, it is determined that the tire is not decompressed. Further, even when the wheel speeds Vi (i = 1 to 4) of the four-wheel tires are larger than the absolute vehicle speed SV in the step S3, the four-wheel decompression can be determined by the same steps S4 to S6. .
Further, in the present embodiment, in step S3,
Among four-wheel tires, for example, wheel speed Vi (i = 2,
Even when 4) is larger than the absolute speed SV of the vehicle, it is possible to detect the simultaneous decompression of the two-wheel tires on the same side (right side) of the four-wheel vehicle by the same steps S4 to S6.
【００２３】つぎに本発明を実施例に基づいて説明する
が、本発明はかかる実施例のみに限定されるものではな
い。Next, the present invention will be explained based on examples, but the present invention is not limited to such examples.
【００２４】実施例１
４輪に正常内圧（２００ｋＰａ）のタイヤ（タイヤサイ
ズ：２１５／５０Ｒ１７）が装着されたセドリック（車
両）を用意した。そして、絶対速度を計測するようにプ
ログラミングされたタイヤ空気圧低下検出装置を搭載し
た。Example 1 A cedric (vehicle) equipped with tires (tire size: 215 / 50R17) having normal internal pressure (200 kPa) on four wheels was prepared. Then, a tire pressure drop detecting device programmed so as to measure an absolute speed was installed.
【００２５】ついでＡＨＳ（自動運転道路システム）と
同様なシステムを設定するために、住友ゴム工業(株)の
岡山テストコースに、１０ｍ間隔の位置に光電管を設置
した。ついで光電管を用いて、１０ｍを通過する時間を
求め、距離と時間で計算された速度を車両の絶対速度と
定義する。ついで前記光電管のあいだを５回走行させた
のちの絶対速度と各車輪速度を計算した結果を表１に示
す。表１から、車両の絶対速度と各車輪速度との差は
０．０１ｋｍ／ｈ程度である。Next, in order to set up a system similar to the AHS (Automatic Driving Road System), photoelectric cells were installed at 10 m intervals on the Okayama test course of Sumitomo Rubber Industries, Ltd. Then, using a phototube, the time for passing 10 m is obtained, and the speed calculated by the distance and time is defined as the absolute speed of the vehicle. Next, Table 1 shows the results of calculation of the absolute speed and the wheel speeds after traveling five times between the photocells. From Table 1, the difference between the absolute vehicle speed and each wheel speed is about 0.01 km / h.
【００２６】[0026]
【表１】 [Table 1]
【００２７】つぎに前記４つのタイヤの空気圧をそれぞ
れ２５％減圧（１５０ｋＰａ）したのち、同様な走行試
験を５回行なった。このときの絶対速度と各車輪速度を
計算した結果を表２に示す。表２から、車両絶対速度と
各車輪速度との差は０．０６ｋｍ／ｈ程度である。Next, the air pressure of each of the four tires was reduced by 25% (150 kPa), and the same running test was conducted 5 times. Table 2 shows the results of calculating the absolute speed and the wheel speeds at this time. From Table 2, the difference between the vehicle absolute speed and each wheel speed is about 0.06 km / h.
【００２８】[0028]
【表２】 [Table 2]
【００２９】このように車両の絶対速度に対し、内圧が
下がると動荷重半径が小さくなり車輪の回転速度が速く
なることから、絶対速度と各車輪速度をモニターし、そ
の大小関係の差が所定値、たとえば０．０３をこえかつ
１０秒以上持続している場合に、警報を発する。したが
って、４輪タイヤの同時減圧の場合でもドライバーに注
意を喚起して安全走行させることができる。As described above, since the dynamic load radius becomes smaller and the wheel rotation speed becomes faster when the internal pressure decreases with respect to the absolute speed of the vehicle, the absolute speed and each wheel speed are monitored, and the difference in magnitude relationship is determined. If it exceeds a value, for example, 0.03 and continues for 10 seconds or more, an alarm is issued. Therefore, even when the four-wheel tires are simultaneously depressurized, the driver can be alerted to drive safely.
【００３０】[0030]
【発明の効果】以上説明したとおり、本発明によれば、
１輪タイヤの減圧を検出することができるとともに、減
圧判定の精度を向上させるために、４輪タイヤの同時減
圧を検出することができる。As described above, according to the present invention,
It is possible to detect the decompression of the one-wheel tire, and it is possible to detect the simultaneous decompression of the four-wheel tire in order to improve the accuracy of the decompression determination.
【図１】本発明のタイヤ空気圧低下検出装置の一実施の
形態を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of a tire pressure drop detecting device of the present invention.
【図２】図１のタイヤ空気圧低下検出装置の電気的構成
を示すブロック図である。FIG. 2 is a block diagram showing an electrical configuration of the tire pressure drop detecting device of FIG.
【図３】本発明のフローチャートの一例である。FIG. 3 is an example of a flowchart of the present invention.
１ 回転情報検出手段 ２ 制御ユニット ３ 低μ路警報表示器 ４ 初期化スイッチ ５ 磁気センサ 1 Rotation information detection means 2 control unit 3 Low μ road warning indicator 4 initialization switch 5 Magnetic sensor
Claims (3)
情報に基づいてタイヤの内圧低下を検出するタイヤ空気
圧低下検出方法であって、前記各タイヤの回転情報を検
出する工程と、前記各タイヤの回転情報から車輪速度を
演算する工程と、前記各タイヤの車輪速度を記憶する工
程と、前記車両の絶対速度を計測する工程と、当該計測
された車両の絶対速度と前記各タイヤの車輪速度とを比
較し、タイヤの空気圧低下を判定する工程を含むタイヤ
空気圧低下検出方法。1. A tire pressure drop detecting method for detecting a decrease in tire internal pressure based on rotation information obtained from a tire mounted on a vehicle, the method comprising: detecting rotation information of each tire; A step of calculating a wheel speed from rotation information, a step of storing the wheel speed of each tire, a step of measuring an absolute speed of the vehicle, an absolute speed of the measured vehicle, and a wheel speed of each tire. And a method for detecting a decrease in tire air pressure, the method including:
情報に基づいてタイヤの内圧低下を検出するタイヤ空気
圧低下検出装置であって、前記各タイヤの回転情報を検
出する回転情報検出手段と、該各タイヤの回転情報から
車輪速度を演算する演算手段と、該各タイヤの車輪速度
を記憶する記憶手段と、前記車両の絶対速度を計測する
計測手段と、当該計測された車両の絶対速度と前記各タ
イヤの車輪速度とを比較し、タイヤの空気圧低下を判定
する減圧判定手段とを備えてなるタイヤ空気圧低下検出
装置。2. A tire air pressure drop detecting device for detecting a decrease in tire internal pressure based on rotation information obtained from a tire mounted on a vehicle, comprising: rotation information detecting means for detecting rotation information of each tire; Calculation means for calculating the wheel speed from the rotation information of each tire, storage means for storing the wheel speed of each tire, measuring means for measuring the absolute speed of the vehicle, and the measured absolute speed of the vehicle and the A tire air pressure drop detection device comprising: a pressure reduction determination means for comparing a wheel speed of each tire to determine a tire air pressure drop.
ンピュータを、各タイヤの回転情報から車輪速度を演算
する演算手段、該各タイヤの車輪速度を記憶する記憶手
段、前記車両の絶対速度を計測する計測手段、当該計測
された車両の絶対速度と前記各タイヤの車輪速度とを比
較し、タイヤの空気圧低下を判定する減圧判定手段とし
て機能させるためのタイヤ減圧判定のプログラム。3. A computer for determining a decrease in tire air pressure, a computing means for computing a wheel speed from rotation information of each tire, a storage means for storing a wheel speed of each tire, and an absolute speed of the vehicle. And a tire decompression determination program for functioning as a decompression determination means for determining a decrease in tire air pressure by comparing the measured absolute vehicle speed with the wheel speed of each tire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001348533A JP2003146037A (en) | 2001-11-14 | 2001-11-14 | Tire pressure drop detecting method and device and program for tire decompression determination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001348533A JP2003146037A (en) | 2001-11-14 | 2001-11-14 | Tire pressure drop detecting method and device and program for tire decompression determination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003146037A true JP2003146037A (en) | 2003-05-21 |
Family
ID=19161343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001348533A Pending JP2003146037A (en) | 2001-11-14 | 2001-11-14 | Tire pressure drop detecting method and device and program for tire decompression determination |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003146037A (en) |
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| JP2006130941A (en) * | 2004-11-02 | 2006-05-25 | Sumitomo Rubber Ind Ltd | Tire discrimination device and method |
| JP2007320401A (en) * | 2006-05-31 | 2007-12-13 | Sumitomo Rubber Ind Ltd | Method and device for determining road surface friction coefficient, and program for determining road surface friction coefficient |
| JP2008007098A (en) * | 2006-05-31 | 2008-01-17 | Sumitomo Rubber Ind Ltd | Lowered tire-air pressure alarming method |
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| EP1974962A2 (en) | 2007-03-30 | 2008-10-01 | Sumitomo Rubber Industries, Ltd. | Method for alarming a decrease in tire air-pressure and device thereof, and program thereof |
| US7522032B2 (en) | 2005-08-09 | 2009-04-21 | Sumitomo Rubber Industries, Ltd. | Method for detecting decrease in inner pressure of tire using GPS speed information |
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| US7831346B2 (en) | 2003-11-25 | 2010-11-09 | Sumitomo Rubber Industries, Inc. | Method for detecting decompression of tires and device thereof, and program for judging decompression of tires |
| US7551992B2 (en) | 2003-11-25 | 2009-06-23 | Sumitomo Rubber Industries, Ltd. | Detecting tire decompression based on wheel speed |
| JP4672333B2 (en) * | 2004-11-02 | 2011-04-20 | 住友ゴム工業株式会社 | Tire identification apparatus and method |
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| JP2007320401A (en) * | 2006-05-31 | 2007-12-13 | Sumitomo Rubber Ind Ltd | Method and device for determining road surface friction coefficient, and program for determining road surface friction coefficient |
| JP2008007098A (en) * | 2006-05-31 | 2008-01-17 | Sumitomo Rubber Ind Ltd | Lowered tire-air pressure alarming method |
| JP4604062B2 (en) * | 2006-05-31 | 2010-12-22 | 住友ゴム工業株式会社 | Tire pressure drop warning method |
| JP2008143460A (en) * | 2006-12-13 | 2008-06-26 | Bridgestone Corp | Tire wear loss estimating device and vehicle mounted therewith |
| WO2008072453A1 (en) * | 2006-12-13 | 2008-06-19 | Kabushiki Kaisha Bridgestone | Device for estimating tire wear amount and vehicle mounted with device for estimating tire wear amount |
| US8493200B2 (en) | 2006-12-13 | 2013-07-23 | Kabushiki Kaisha Bridgestone | Apparatus for estimating tire wear amount and a vehicle on which the apparatus for estimating tire wear is mounted |
| EP1974962A2 (en) | 2007-03-30 | 2008-10-01 | Sumitomo Rubber Industries, Ltd. | Method for alarming a decrease in tire air-pressure and device thereof, and program thereof |
| CN110244076A (en) * | 2019-06-21 | 2019-09-17 | 威海立方盛电子科技有限公司 | A kind of distributed method and wind measuring device monitoring the economic speed per hour of vehicle safety |
| GB2585913A (en) * | 2019-07-23 | 2021-01-27 | Airbus Operations Ltd | Method of Assessing the health of an aircraft tyre |
| US11917934B2 (en) | 2020-12-22 | 2024-03-05 | Kubota Corporation | Agricultural machine, and system and method for controlling agricultural machine |
| JP7439812B2 (en) | 2021-12-01 | 2024-02-28 | トヨタ自動車株式会社 | Air pressure abnormality determination system and air pressure abnormality determination method |
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