JP2003165318A - Method and device for detecting lowering of tire air pressure and program for deciding tire pressure reduction - Google Patents
Method and device for detecting lowering of tire air pressure and program for deciding tire pressure reductionInfo
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- JP2003165318A JP2003165318A JP2001365049A JP2001365049A JP2003165318A JP 2003165318 A JP2003165318 A JP 2003165318A JP 2001365049 A JP2001365049 A JP 2001365049A JP 2001365049 A JP2001365049 A JP 2001365049A JP 2003165318 A JP2003165318 A JP 2003165318A
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- tire
- rotation information
- wheels
- detecting
- rear wheels
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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、タイヤに駆動と制動がか
かっていない車両から得られる回転情報（回転車輪速デ
ータ）を用いることにより、前輪または後輪の２輪タイ
ヤの同時減圧を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, by using the rotation information (rotating wheel speed data) obtained from a vehicle in which the tires are not driven and braked, it is possible to detect simultaneous decompression of two front tires or two rear tires. The present invention relates to a detection method and device, 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】しかしながら、この方法は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、
前輪２輪の同時減圧または後輪２輪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 this method, since the pressure reduction is determined from the difference between the sums of the rotational angular velocities at the diagonals of the four wheels,
Simultaneous decompression of two front wheels or simultaneous decompression of two rear wheels cannot be detected. For this reason, there is a problem that if the vehicle is depressurized and the vehicle continues to run, the rolling resistance of the tires increases and the fuel consumption deteriorates, resulting in a burst.
【０００４】本発明は、叙上の事情に鑑み、前輪２輪の
同時減圧または後輪２輪の同時減圧を検出することがで
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を提供することを目的とす
る。In view of the above circumstances, the present invention provides a tire air pressure drop detecting method and apparatus capable of detecting simultaneous decompression of two front wheels or simultaneous decompression of two rear wheels, and a tire decompression determination program. The purpose is to do.
【０００５】[0005]
【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を記憶する工程
と、直線走行時で、タイヤに駆動と制動がかかっていな
いときの前記車両の前輪２輪の回転情報と後輪２輪の回
転情報とを比較する工程と、該前輪２輪と後輪２輪の回
転情報の比較値と所定のしきい値との関係に基づいて、
前輪２輪の同時減圧または後輪２輪の同時減圧を判定す
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 tire rotation information, a step of storing the rotation information of each tire, a rotation information and a rear wheel of the two front wheels of the vehicle when driving and braking are not applied to the tire during straight running Based on the step of comparing the rotation information of the two wheels and the relation between the comparison value of the rotation information of the two front wheels and the two rear wheels and a predetermined threshold value,
The method is characterized by including a step of determining simultaneous decompression of two front wheels or simultaneous decompression of two rear wheels.
【０００６】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、前記各タイヤの回転情報を記憶する回
転情報記憶手段と、直線走行時で、タイヤに駆動と制動
がかかっていないときの前記車両の前輪２輪の回転情報
と後輪２輪の回転情報とを比較する比較手段と、該前輪
２輪と後輪２輪の回転情報の比較値と所定のしきい値と
の関係に基づいて、前輪２輪の同時減圧または後輪２輪
の同時減圧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. Rotation information detecting means for detecting the rotation information, rotation information storing means for storing the rotation information of each tire, rotation information of the two front wheels of the vehicle when the tire is not driven and braked during straight running. Simultaneous decompression of the two front wheels or a comparison means for comparing the rotation information of the two rear wheels with a comparison value of the rotation information of the two front wheels and the two rear wheels and a predetermined threshold value. It is characterized by comprising a pressure reduction determining means for determining simultaneous pressure reduction of the two rear wheels.
【０００７】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を記憶する回転情報記憶手
段、直線走行時で、タイヤに駆動と制動がかかっていな
いときの前記車両の前輪２輪の回転情報と後輪２輪の回
転情報とを比較する比較手段、該前輪２輪と後輪２輪の
回転情報の比較値と所定のしきい値との関係に基づい
て、前輪２輪の同時減圧または後輪２輪の同時減圧を判
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。The tire decompression determination program of the present invention further includes a computer for determining a decrease in tire air pressure, rotation information storage means for storing rotation information of each tire, and driving and braking of the tire during straight running. Comparing means for comparing the rotation information of the two front wheels and the rotation information of the two rear wheels of the vehicle when not applied, the comparison value of the rotation information of the two front wheels and the two rear wheels, and a predetermined threshold value It is characterized by functioning as a decompression determining means for determining simultaneous decompression of the two front wheels or simultaneous decompression of the two rear wheels based on the relationship with.
【０００８】[0008]
【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.
【０００９】図１に示されるように、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、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 has four tires FL, FR, RL and RR provided on a four-wheel vehicle.
(Hereinafter, they are collectively referred to as Wi. Here, i = 1 to 4,
1: front left tire, 2: front right tire, 3: rear left tire,
(4: rear right tire) detects whether or not the air pressure of the tire has decreased, and is provided with a normal rotation information detection means 1 provided in association with each tire Wi.
【００１０】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ＣＲＴなどで構成された表示器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 and a rotation speed is used like a dynamo or a wheel speed sensor for measuring a 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 provided to the control unit 2 which is a computer such as ABS. Connected to the control unit 2 are a liquid crystal display device for notifying the tire Wi whose air pressure has dropped, a display device 3 including a plasma display device or a CRT, and an initialization switch 4 that can be operated by a driver. There is.
【００１１】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 necessary 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.
【００１２】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 Wi
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 rotation angular velocity F i of each tire Wi based on the wheel speed pulse output from the rotation information detecting means 1 every predetermined sampling period ΔT (sec), for example, ΔT = 1 second.
【００１３】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 tire Wi is manufactured with a variation (initial difference) within the standard included, each tire W is
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 Wi have normal internal pressure. Therefore, each tire Wi
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 .
【００１４】本発明では、減圧判定の精度を向上させる
ために、４輪タイヤのうち、１輪タイヤの減圧を判定す
るとともに、前輪２輪の同時減圧または後輪２輪の同時
減圧を判定することができる。たとえば減圧判定のしき
い値として、前輪または後輪の２輪タイヤが同時に２５
％減圧していると判定するしきい値に設定している場
合、１輪タイヤが５０％に減圧しているときを判定する
ことができる。In the present invention, in order to improve the accuracy of the pressure reduction determination, the pressure reduction of one of the four tires is determined, and the simultaneous pressure reduction of the two front wheels or the pressure reduction of the two rear wheels is determined. be able to. For example, as the threshold value for the decompression determination, the front and rear two-wheel tires are set to 25 at the same time.
When the threshold value for determining that the% tire pressure is reduced is set, it is possible to determine when the one-wheel tire is reduced to 50%.
【００１５】すなわち本実施の形態では、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の回転情報を記憶する回転情報記憶手段
と、直線走行時で、タイヤに駆動と制動がかかっていな
いときの前記車両の前輪２輪の回転情報と後輪２輪の回
転情報とを比較する比較手段と、該前輪２輪と後輪２輪
の回転情報の比較値と所定のしきい値との関係に基づい
て、前輪２輪の同時減圧または後輪２輪の同時減圧を判
定する減圧判定手段とを備えている。That is, in the present embodiment, the rotation information detecting means 1 for detecting the rotation information of each of the tires Wi, the rotation information storage means for storing the rotation information of each of the tires Wi, and the tires during straight running Comparing means for comparing the rotation information of the two front wheels and the rotation information of the two rear wheels of the vehicle when neither driving nor braking is applied, and a comparison value of the rotation information of the two front wheels and the two rear wheels. Pressure reduction determining means for determining the simultaneous pressure reduction of the two front wheels or the simultaneous pressure reduction of the two rear wheels based on the relationship with a predetermined threshold value.
【００１６】なお、前記比較値としては、たとえば比の
変動量以外にも差などがあげられる。本実施の形態で
は、該比較値が比の変動量である場合について説明す
る。The comparison value may be, for example, a difference in addition to the variation amount of the ratio. In the present embodiment, a case where the comparison value is a variation amount of the ratio will be described.
【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、前記各タイヤ
Ｗｉの回転情報を記憶する回転情報記憶手段、直線走行
時で、タイヤに駆動と制動がかかっていないときの前記
車両の前輪２輪の回転情報と後輪２輪の回転情報とを比
較する比較手段、該前輪２輪と後輪２輪の回転情報の比
較値と所定のしきい値との関係に基づいて、前輪２輪の
同時減圧または後輪２輪の同時減圧を判定する減圧判定
手段として機能させる。In the tire pressure reduction determination program according to the present embodiment, the control unit 2 is a rotation information storage unit that stores rotation information of each tire Wi, and the tire is driven and braked during straight running. Comparing means for comparing the rotation information of the front two wheels and the rotation information of the rear two wheels of the vehicle when there is no such, a comparison value of the rotation information of the front two wheels and the rear two wheels, and a predetermined threshold value. Based on the relationship, it is made to function as a pressure reduction determining means for determining the simultaneous pressure reduction of the two front wheels or the simultaneous pressure reduction of the two rear wheels.
【００１８】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.
【００１９】まず車両が直線走行しており、かつタイヤ
に駆動と制動がかかっているか否かを判断する（ステッ
プＳ１）。この判断法としては、たとえば舵角センサの
情報を用いて直線走行（条件１）と判断するとともに、
ＡＢＳなどの車両の走行状態を制御する装置で計算され
ているトルク情報を予め規定されているしきい値と比較
することにより、駆動と制動がかかっていない（条件
２）と判断する。ついでこれらの条件１、２を満たして
いる場合、車両の前輪２輪および後輪２輪の回転車輪速
度の和（ＶＦ、ＶＲ）をそれぞれ求める（ステップＳ
２、Ｓ３）。ついで前記前輪と後輪の回転車輪速度の比
（ＶＦ／ＶＲ）を求める（ステップＳ４）。この比をＶ
ＲＡＴＩＯとすると、通常正常内圧である場合、ＶＲＡ
ＴＩＯは、前輪と後輪の回転車輪速度がほぼ等しくなる
ことから１近辺になる。これに対し、前輪２輪および後
輪２輪のうち、いずれか一方の側の２輪タイヤが減圧し
ているとＶＲＡＴＩＯは１から離れていく。したがっ
て、１からの回転車輪速度の比の変動量（１−ＶＲＡＴ
ＩＯ）の絶対値を求める（ステップＳ５）。そして、こ
の絶対値ＤＶＲＡＴＩＯが所定のしきい値、たとえば
０．００３をこえているか否かが判断され（ステップＳ
６）、０．００３以上である場合、前輪２輪または後輪
２輪が同時に減圧していると判断する（ステップＳ
７）。なお、前記しきい値は、予め実験を行ない減圧走
行したデータにより、設定することができる。First, it is determined whether the vehicle is traveling straight and the tires are being driven and braked (step S1). As this determination method, for example, it is determined that the vehicle is traveling straight (condition 1) using information from the steering angle sensor, and
By comparing the torque information calculated by the device for controlling the running state of the vehicle such as ABS with a predetermined threshold value, it is determined that driving and braking are not applied (condition 2). Then, when these conditions 1 and 2 are satisfied, the sum (VF, VR) of the rotating wheel speeds of the two front wheels and the two rear wheels of the vehicle is obtained (step S).
2, S3). Then, the ratio (VF / VR) of the rotating wheel speeds of the front wheels and the rear wheels is obtained (step S4). This ratio is V
If it is RATIO, when normal internal pressure is normal, VRA
TIO is around 1 because the rotating wheel speeds of the front wheels and the rear wheels are almost equal. On the other hand, VRATIO moves away from 1 when the tire on either side of the two front wheels and the two rear wheels is depressurized. Therefore, the fluctuation amount of the ratio of the rotating wheel speed from 1 (1-VRAT
The absolute value of (IO) is calculated (step S5). Then, it is determined whether or not this absolute value DVRATIO exceeds a predetermined threshold value, for example, 0.003 (step S
6) If 0.003 or more, it is determined that the two front wheels or the two rear wheels are simultaneously depressurized (step S).
7). Note that the threshold value can be set based on data obtained by conducting an experiment in advance and reducing the pressure.
【００２０】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。
実施例１
車両として、正常内圧（２．２×１０5Ｐａ）の夏タイ
ヤが装着されたＦＦ（フロントエンジン・フロントドラ
イブ）車を用意した。前記タイヤのタイヤサイズは１８
５／７０Ｒ１４である。また、車両の走行条件として
は、搭乗者２名にて直線コースを一定速度（５０ｋｍ／
ｈ）で直線走行する条件を採用した。Next, the present invention will be explained based on examples, but the present invention is not limited to such examples. Example 1 As a vehicle, an FF (front engine / front drive) vehicle equipped with a summer tire having a normal internal pressure (2.2 × 10 5 Pa) was prepared. The tire size of the tire is 18
It is 5 / 70R14. In addition, as a driving condition of the vehicle, two passengers can drive the straight course at a constant speed (50 km /
The condition of running straight in h) was adopted.
【００２１】実施例２
前記車両の前輪の２輪タイヤの空気圧をそれぞれ２５％
減圧させたのち、車両を前記走行条件で走行させた。Example 2 The air pressure of each of the two front tires of the vehicle is set to 25%.
After depressurizing, the vehicle was run under the above running conditions.
【００２２】前記実施例１、２について、前後輪の車輪
速度の比ＤＬＲ（ＶＲＡＴＩＯ）、右サイドと左サイド
（同サイド）の車輪速度の比ＤＦＲおよび対角線上の和
の車輪速度の比ＤＥＬを求めた。その結果を図４〜５に
示す。For the first and second embodiments, the front and rear wheel speed ratio DLR (VRATIO), the right side and left side (the same side) wheel speed ratio DFR, and the diagonal sum wheel speed ratio DEL are shown. I asked. The results are shown in FIGS.
【００２３】図４から、正常内圧では、車輪速度の比Ｄ
ＦＲおよびＤＥＬは１近辺であり、前後輪の車輪速度の
比ＤＬＲ（ＶＲＡＴＩＯ）は１．００１５近辺である。
そして、図５から、前輪２輪タイヤが共に２５％減圧で
ある場合でも、同サイドの車輪速度の比ＤＦＲおよび対
角線上の和の車輪速度の比ＤＥＬはあまり変動していな
いが、前後輪の車輪速度の比ＤＬＲ（ＶＲＡＴＩＯ）
は、変動量が大きく０．００３をこえて１．００３以上
であることがわかる。これにより、前輪の２輪タイヤが
同時に減圧していることを判定することができる。From FIG. 4, at normal internal pressure, the wheel speed ratio D
FR and DEL are around 1, and the wheel speed ratio DLR (VRATIO) of the front and rear wheels is around 1.0015.
From FIG. 5, even when the front two-wheel tires both have a 25% pressure reduction, the wheel speed ratio DFR on the same side and the sum wheel speed ratio DEL on the diagonal line do not fluctuate much, but Wheel speed ratio DLR (VRATIO)
It can be seen that the fluctuation amount is greater than 0.003 and is 1.003 or more. This makes it possible to determine that the two front tires are simultaneously depressurized.
【００２４】[0024]
【発明の効果】以上説明したとおり、本発明によれば、
直線走行時で、タイヤに駆動と制動がかかっていない車
両の前輪２輪の回転情報（回転車輪速度）と後輪２輪の
回転情報（回転車輪速度）を比較し、著しく違いが見ら
れる場合は、前輪および後輪のいずれかの２輪タイヤが
同時に減圧していると判断することができる。As described above, according to the present invention,
When running straight and comparing the rotation information (rotating wheel speed) of the two front wheels and the rotating information (rotating wheel speed) of the two rear wheels of a vehicle in which the tires are not driven or braked, and a significant difference is found Can determine that the tires of either of the front wheels and the rear wheels are simultaneously decompressed.
【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.
【図４】正常内圧のタイヤの場合の、前後輪の車輪速度
の比ＤＬＲ（ＶＲＡＴＩＯ）、右サイドと左サイドの車
輪速度の比ＤＦＲおよび対角線上の和の車輪速度の比Ｄ
ＥＬと時間との関係を示す図である。FIG. 4 shows a front and rear wheel speed ratio DLR (VRATIO), a right-side and left-side wheel speed ratio DFR, and a diagonal sum wheel speed ratio D in the case of a tire having normal internal pressure.
It is a figure which shows the relationship between EL and time.
【図５】前輪２輪タイヤが２５％減圧である場合の、前
後輪の車輪速度の比ＤＬＲ（ＶＲＡＴＩＯ）、右サイド
と左サイドの車輪速度の比ＤＦＲおよび対角線上の和の
車輪速度の比ＤＥＬと時間との関係を示す図である。FIG. 5 is a front-rear wheel speed ratio DLR (VRATIO), a right-side and left-side wheel speed ratio DFR, and a diagonal sum wheel speed ratio when the front two-wheel tires have a pressure reduction of 25%. It is a figure which shows the relationship between DEL and time.
１ 回転情報検出手段 ２ 制御ユニット ３ 表示器 ４ 初期化スイッチ 1 Rotation information detection means 2 control unit 3 display 4 initialization switch
フロントページの続き (72)発明者 梁瀬 未南夫 兵庫県神戸市中央区脇浜町３丁目６番９号 住友ゴム工業株式会社内 Ｆターム(参考） 2F055 AA12 BB03 CC14 DD20 EE39 FF31 FF41 GG03 GG31 Continued front page (72) Inventor Minamio Yase 3-6-9 Wakihama-cho, Chuo-ku, Kobe-shi, Hyogo Sumitomo Rubber Industries, Ltd. F term (reference) 2F055 AA12 BB03 CC14 DD20 EE39 FF31 FF41 GG03 GG31
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を記憶する工程
と、直線走行時で、タイヤに駆動と制動がかかっていな
いときの前記車両の前輪２輪の回転情報と後輪２輪の回
転情報とを比較する工程と、該前輪２輪と後輪２輪の回
転情報の比較値と所定のしきい値との関係に基づいて、
前輪２輪の同時減圧または後輪２輪の同時減圧を判定す
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 storing the rotation information, a step of comparing the rotation information of the two front wheels and the rotation information of the two rear wheels of the vehicle when the tire is not driven and braked during straight running, and the front wheel Based on the relationship between the comparison value of the rotation information of the two wheels and the two rear wheels and a predetermined threshold value,
A method for detecting a decrease in tire air pressure, which includes the step of determining simultaneous decompression of two front wheels or simultaneous decompression of two rear wheels.
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、前記各タイヤの回転情報を
記憶する回転情報記憶手段と、直線走行時で、タイヤに
駆動と制動がかかっていないときの前記車両の前輪２輪
の回転情報と後輪２輪の回転情報とを比較する比較手段
と、該前輪２輪と後輪２輪の回転情報の比較値と所定の
しきい値との関係に基づいて、前輪２輪の同時減圧また
は後輪２輪の同時減圧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 internal pressure of a tire based on rotation information obtained from a tire mounted on a vehicle, comprising: rotation information detecting means for detecting rotation information of each tire; A rotation information storage unit that stores rotation information of each tire is compared with rotation information of two front wheels and two rear wheels of the vehicle when the tire is not driven and braked during straight running. The simultaneous decompression of the two front wheels or the simultaneous decompression of the two rear wheels is determined based on the comparison means and the relationship between the comparison value of the rotation information of the two front wheels and the two rear wheels and a predetermined threshold value. A tire pressure drop detecting device comprising a pressure reduction determining means.
ンピュータを、各タイヤの回転情報を記憶する回転情報
記憶手段、直線走行時で、タイヤに駆動と制動がかかっ
ていないときの前記車両の前輪２輪の回転情報と後輪２
輪の回転情報とを比較する比較手段、該前輪２輪と後輪
２輪の回転情報の比較値と所定のしきい値との関係に基
づいて、前輪２輪の同時減圧または後輪２輪の同時減圧
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 rotation information storage means for storing rotation information of each tire, front wheels of the vehicle when driving and braking are not applied to the tire during straight running. Two wheel rotation information and rear wheel 2
Comparison means for comparing rotation information of wheels, simultaneous decompression of two front wheels or two rear wheels based on a relationship between a comparison value of rotation information of the two front wheels and two rear wheels and a predetermined threshold value. A tire decompression determination program for functioning as a decompression determination means for determining simultaneous decompression.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001365049A JP2003165318A (en) | 2001-11-29 | 2001-11-29 | Method and device for detecting lowering of tire air pressure and program for deciding tire pressure reduction |
| EP02023808A EP1306235B1 (en) | 2001-10-25 | 2002-10-23 | Method and apparatus for detecting decrease in tire air-pressure |
| DE60231098T DE60231098D1 (en) | 2001-10-25 | 2002-10-23 | Method and device for detecting tire pressure loss |
| US10/280,060 US6831553B2 (en) | 2001-10-25 | 2002-10-25 | Method and apparatus for detecting decrease in tire air-pressure and program for judging decompression of tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001365049A JP2003165318A (en) | 2001-11-29 | 2001-11-29 | Method and device for detecting lowering of tire air pressure and program for deciding tire pressure reduction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003165318A true JP2003165318A (en) | 2003-06-10 |
Family
ID=19175138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001365049A Pending JP2003165318A (en) | 2001-10-25 | 2001-11-29 | Method and device for detecting lowering of tire air pressure and program for deciding tire pressure reduction |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003165318A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2386431A2 (en) | 2010-05-11 | 2011-11-16 | Sumitomo Rubber Industries, Ltd. | Apparatus and method for detecting decrease in tire air pressure and program for detecting decrease in tire air pressure |
| US8261606B2 (en) | 2008-11-26 | 2012-09-11 | Sumitomo Rubber Industries, Ltd. | Apparatus and method for detecting decrease in tire air pressure and program for detecting decrease in tire air pressure |
-
2001
- 2001-11-29 JP JP2001365049A patent/JP2003165318A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8261606B2 (en) | 2008-11-26 | 2012-09-11 | Sumitomo Rubber Industries, Ltd. | Apparatus and method for detecting decrease in tire air pressure and program for detecting decrease in tire air pressure |
| EP2386431A2 (en) | 2010-05-11 | 2011-11-16 | Sumitomo Rubber Industries, Ltd. | Apparatus and method for detecting decrease in tire air pressure and program for detecting decrease in tire air pressure |
| US8423228B2 (en) | 2010-05-11 | 2013-04-16 | Sumitomo Rubber Industries, Ltd. | Apparatus and method for detecting decrease in tire air pressure and program for detecting decrease in tire air pressure |
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