JP3129555B2 - Tire pressure abnormality detection method and device - Google Patents
Tire pressure abnormality detection method and deviceInfo
- Publication number
- JP3129555B2 JP3129555B2 JP04340000A JP34000092A JP3129555B2 JP 3129555 B2 JP3129555 B2 JP 3129555B2 JP 04340000 A JP04340000 A JP 04340000A JP 34000092 A JP34000092 A JP 34000092A JP 3129555 B2 JP3129555 B2 JP 3129555B2
- Authority
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- Japan
- Prior art keywords
- angular velocity
- speed
- vehicle
- wheel
- air pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Description
【0001】[0001]
【産業上の利用分野】本発明は乗用車、トラックなどの
車輌のタイヤ空気圧異常の検出方法および検出装置に関
する。さらに詳しくは、ABS(アンチ−ロック−ブレ
ーキング−システム)の車輪速度パルスを利用して低コ
ストを実現しながら、加速度検出器を1つ設けるという
最小限のコスト増で、2輪以上の同時異常も簡便かつ確
実に検出できる方法および装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting abnormal tire air pressure in vehicles such as passenger cars and trucks. More specifically, while realizing low cost by using ABS (anti-lock-braking-system) wheel speed pulses, the minimum cost increase of one acceleration detector and the simultaneous increase of two or more wheels are achieved. The present invention relates to a method and an apparatus that can easily and reliably detect an abnormality.
【0002】[0002]
【従来の技術】タイヤの空気圧は車輌の性能に多大の影
響を及ぼし、とくに空気圧の減少は安全に係わる問題で
ある。このため、従来からタイヤの空気圧異常を検出す
る手段が数多く提案されてきた。しかしながら、これら
の提案は実用化に際して高信頼性と低コストを両立させ
ることが困難であったため広く普及することがなかっ
た。近年、ABSの普及に伴いABSの車輪速度パルス
を利用し、低コストかつ高信頼性を兼ね備えたシステム
が提案されているが、該システムは1輪の異常に対して
は信頼性を有するものの2輪以上の同時異常に対して不
安を残している。2. Description of the Related Art The pressure of a tire greatly affects the performance of a vehicle, and the reduction of the pressure is a problem related to safety. For this reason, many means for detecting an abnormal air pressure of a tire have been conventionally proposed. However, these proposals did not spread widely because it was difficult to achieve both high reliability and low cost in practical use. In recent years, with the spread of ABS, a system that uses the wheel speed pulse of the ABS and has both low cost and high reliability has been proposed. He is worried about simultaneous abnormalities over the ring.
【0003】[0003]
【発明が解決しようとする課題】ところで、通常こうし
た空気圧異常を検出する装置は、検出の手段によりいく
つかに分類される。1つは空気圧を直接に検知するタイ
プであり、もう1つは空気圧によって変化する物理量
(たわみ量、回転数など)を検知するタイプである。By the way, devices for detecting such air pressure abnormalities are generally classified into several types by means of detection. One is a type that directly detects the air pressure, and the other is a type that detects a physical quantity (a deflection amount, a rotation speed, and the like) that changes according to the air pressure.
【0004】前者は信頼性において有利な反面、回転体
から固定側への信号の伝達などの難しい問題があるため
装置が複雑、高価になりやすい。また、後者は装置が単
純、安価な代わりに信頼性に乏しい面がある。[0004] The former is advantageous in reliability, but has a difficult problem such as transmission of a signal from the rotating body to the fixed side, so that the apparatus is complicated and tends to be expensive. In the latter, the device is simple and inexpensive, but has poor reliability.
【0005】また、こうした車輪速から空気圧異常を検
出するシステムでは、通常、正常輪の車輪速度パルスと
の比較によって異常が判断されるため、少なくとも1本
のタイヤの空気圧は正常でなければならないため、4輪
同時の異常は理論的に検出することができない。In a system for detecting an abnormal air pressure based on the wheel speed, the abnormality is usually determined by comparing the wheel pressure with a wheel speed pulse of a normal wheel. Therefore, the air pressure of at least one tire must be normal. The simultaneous abnormality of four wheels cannot be detected theoretically.
【0006】本発明は、叙上の事情に鑑み、低コストで
かつ信頼性が高く、しかも4輪同時の異常の検出も可能
となる、タイヤ空気圧異常検出方法および装置を提供す
ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a method and apparatus for detecting an abnormality in tire pressure, which is low-cost, highly reliable, and capable of detecting abnormalities of four wheels at the same time. I do.
【0007】[0007]
【課題を解決するための手段】本発明により、(a)4
輪車輛の、タイヤを装着した各車輪の角速度を検出する
工程、 (b)検出された角速度に比例した信号を発生する工
程、 (c)車輌の前後方向加速度を検出する工程、 (d)検出された加速度を積分して車輛の走行速度を求
める工程、 (e)求められた車輛の走行速度に比例する信号を発生
する工程、および (f)前記角速度に比例した信号および車輛の走行速度
に比例する信号を演算処理する工程からなり、前記信号
を演算処理する工程が、正常空気圧で定められた速度毎
に直進実走行を行ない、速度毎に各車輪の角速度を求め
ることにより予め作成されたテーブルであって、タイヤ
の空気圧が正常時の、車輛の走行速度と車輪の角速度と
の関係を示すテーブルから、実走行中の走行速度におけ
る前記テーブル内の車輪の、正常空気圧における角速度
を求め、この正常空気圧での角速度と実走行中の車輪の
角速度とを各車輪毎に比較して、その差が前記テーブル
の車輪の角速度に対して0.05%から0.60%であればその
タイヤの異常を警告する装置を作動させる工程であり、
2輪以上の同時減圧が検出可能である、車輌のタイヤ空
気圧の異常を検出する方法が提供される。According to the present invention, (a) 4
Detecting the angular velocity of each wheel of a wheeled vehicle equipped with a tire; (b) generating a signal proportional to the detected angular velocity; (c) detecting the longitudinal acceleration of the vehicle; (d) detecting Integrating the determined acceleration to determine a vehicle speed; (e) generating a signal proportional to the determined vehicle speed; and (f) generating a signal proportional to the angular speed and the vehicle speed. A step of calculating a proportional signal, wherein the step of calculating the signal is performed at a speed determined at a normal air pressure.
And then calculate the angular speed of each wheel for each speed.
A table created in advance by Rukoto, tire pressure is normal, the relationship between the vehicle running speed and the wheel angular velocity from shown to tables, wheels in the table in the running speed in actual running of, determine the angular velocity at the normal air pressure, and the angular velocity and a wheel in real running at normal air pressure velocity and compared for each wheel, 0.05% with respect to the wheel of the angular velocity of the difference is the table If it is 0.60%, it is a step to activate the device that warns of abnormality of the tire ,
Provided is a method for detecting an abnormality in tire pressure of a vehicle, capable of detecting simultaneous decompression of two or more wheels .
【0008】また、本発明により、4輪車輛の、タイヤ
を装着した各車輪の角速度を検出する角速度検出手段、
検出された角速度に比例した信号を発生する角速度信号
発生手段、車輌の前後方向加速度を検出する加速度検出
手段、検出された加速度を積分して車輛の走行速度を求
める積分手段、求められた車輛の走行速度に比例する信
号を発生する速度信号発生手段、および前記角速度信号
発生手段および速度信号発生手段から発せられた信号を
演算処理する演算処理手段からなり、前記演算処理手段
が、正常空気圧で定められた速度毎に直進実走行を行な
い、速度毎に各車輪の角速度を求めることにより予め作
成されたテーブルであって、タイヤの空気圧が正常時
の、車輛の走行速度と車輪の角速度との関係を示すテー
ブルから、実走行中の走行速度における前記テーブル内
の車輪の、正常空気圧における角速度を求め、この正常
空気圧での角速度と実走行中の車輪の角速度とを各車輪
毎に比較して、その差が前記テーブルの車輪の角速度に
対して0.05%から0.60%であればそのタイヤの異常を警
告する装置を作動させる工程であり、2輪以上の同時減
圧が検出可能である、車輌のタイヤ空気圧の異常を検出
する装置が提供される。Further, according to the present invention, an angular velocity detecting means for detecting an angular velocity of each wheel on which a tire is mounted in a four-wheel vehicle,
Angular velocity signal generating means for generating a signal proportional to the detected angular velocity, acceleration detecting means for detecting longitudinal acceleration of the vehicle, integrating means for integrating the detected acceleration to obtain the running speed of the vehicle, Speed signal generating means for generating a signal proportional to the traveling speed; and arithmetic processing means for arithmetically processing the signals emitted from the angular velocity signal generating means and the speed signal generating means, wherein the arithmetic processing means is determined by normal air pressure. At a given speed
Work by calculating the angular velocity of each wheel for each speed.
A made table, tire pressure is normal, the relationship between the vehicle running speed and the wheel angular velocity from shown to Te over <br/> table, in the table in the running speed in actual running of the wheels, determine the angular velocity of the normal air pressure, this normal
The angular velocity at the air pressure and the angular velocity of the actual running wheel
To be compared each, the difference is the step of activating the abnormality warning device of the tire if 0.60% to 0.05% with respect to the angular velocity of the wheels of the table, co-down of more than two wheels
An apparatus for detecting an abnormality in tire pressure of a vehicle , the pressure being detectable, is provided.
【0009】[0009]
【作用】本発明においては、車輌の加速度をセンサーに
より計測して、これを車輌の停止時から積分することに
より、現在の車輌の走行速度が求められる。In the present invention, the current running speed of the vehicle is obtained by measuring the acceleration of the vehicle by a sensor and integrating the measured acceleration from the time when the vehicle stops.
【0010】[0010]
【実施例】以下、本発明の車輌のタイヤ空気圧の異常を
検出する方法(以下、単に検出方法という)について各
工程毎に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for detecting an abnormality in the tire pressure of a vehicle (hereinafter, simply referred to as a detection method) according to the present invention will be described for each process.
【0011】工程(a)においては、ABSから発せら
れる車輪速度パルスから、パルスカウンターなどの角速
度検出手段を使用して4輪車輛の、タイヤを装着した各
車輪の角速度が検出される。そして、工程(b)におい
て、D/A変換器などの角速度信号発生手段を使用して
この角速度に比例した信号を発生せしめ、実走行中の車
輛の各車輪の角速度を常時モニタリングする。In the step (a), each wheel-mounted tire of a four-wheeled vehicle is detected from wheel speed pulses emitted from the ABS by using an angular speed detecting means such as a pulse counter.
The angular velocity of the wheel is detected. Then, in step (b), a signal proportional to the angular velocity is generated by using an angular velocity signal generating means such as a D / A converter, so that the vehicle that is actually traveling
The angular velocity of each wheel of the vehicle is constantly monitored.
【0012】工程(c)においては、圧電型または歪ゲ
ージ型加速度変換器などの加速度センサーを使用して、
加速度に比例した電圧をモニターすることにより車輌の
前後方向の加速度が求められる。この加速度をフィルタ
ーを介してA/D変換器に送ってデジタル変換し、一定
時間間隔でサンプリングする。In the step (c), an acceleration sensor such as a piezoelectric or strain gauge type acceleration transducer is used.
By monitoring a voltage proportional to the acceleration, the longitudinal acceleration of the vehicle can be determined. This acceleration is sent to an A / D converter via a filter to be converted into a digital signal, and is sampled at regular time intervals.
【0013】そして、工程(d)において、積分回路な
どの積分手段を使用して、車輌停止時からこのサンプリ
ングされたデジタル値の加速度を積分してゆき、実走行
中の車輌の走行速度を求める。積分はたとえば台形則を
用いて行われる。工程(e)においては、D/A変換器
などの速度信号発生手段を使用してこの走行速度に比例
する信号を発生し、車輌の走行速度を常時モニタリング
する。In the step (d), the acceleration of the sampled digital value is integrated from the stop of the vehicle by using an integrating means such as an integrating circuit, and the actual traveling is performed.
Find the running speed of the middle vehicle. The integration is performed using, for example, the trapezoidal rule. In the step (e), a signal proportional to the running speed is generated by using a speed signal generating means such as a D / A converter to constantly monitor the running speed of the vehicle.
【0014】そして工程(f)において、工程(d)で
求められた車輌の走行速度における正常空気圧での車輪
の角速度を予め作成されたテーブルから求め、これを工
程(a)で求められた車輪の角速度と比較する。この
際、工程(e)および(b)で発せられた信号が利用さ
れる。そして、2つの角速度の差が前記テーブルの車輪
の角速度に対して0.05%から0.60%のあいだにあれば異
常を警告する装置を作動させる。警告はブザーなどの聴
覚に訴えるものや、ランプなどの視覚に訴えるものを用
いて行うことができる。In the step (f), the wheels at normal air pressure at the running speed of the vehicle determined in the step (d)
Of previously obtained from created table angular velocity, comparing this with the step of the wheel obtained in (a) the angular velocity. At this time, the signals emitted in steps (e) and (b) are used. And the difference between the two angular velocities is the wheel of the table
If the angular velocity is between 0.05% and 0.60% of the angular velocity, a device that warns of an abnormality is activated. The warning can be given by using an auditory object such as a buzzer or a visual object such as a lamp.
【0015】前記工程(f)においては、各速度におけ
る各タイヤの正常な空気圧における車輪の角速度を記述
したテーブルが必要であり、かかるテーブルは、正常空
気圧で定められた速度毎に直進実走行を行ない、速度毎
に車輪の角速度を求めることにより作成することができ
る。このようなテーブルの例を表1に示す。In the step (f), a table describing the angular velocity of the wheel at the normal air pressure of each tire at each speed is required. Such a table is used for the actual traveling straight ahead at every speed determined by the normal air pressure. It can be created by calculating the angular velocity of the wheel for each speed. Table 1 shows an example of such a table.
【0016】[0016]
【表1】 [Table 1]
【0017】車輪の角速度は車輌の走行速度によって変
化するので、正常な空気圧の状態であらゆる走行速度で
の車輪の角速度をタイヤ毎に求めておき、これをテーブ
ルにして保持するようにする。[0017] Since the angular speed of the wheel varies with the traveling speed of the vehicle, so as to hold the to previously obtain the angular velocity of the wheels at any speed for every tire in a state of normal pressure, this in table .
【0018】また、車輪の角速度は、空気圧、速度以外
にも荷重、旋回、磨耗、制駆動によっても変化するの
で、これらの影響を取り除く手段、たとえば車輌が旋回
しているか否かを判別したり、制駆動を行なっているか
否かを判別したりする手段(特開昭63-305011 号参照)
を併用すれば、さらに精度の向上を図ることができる。Further, since the angular velocity of the wheel changes due to load, turning, abrasion and braking / driving in addition to the air pressure and speed, means for removing these effects, for example, whether the vehicle is turning or not can be determined. For determining whether or not braking / driving is being performed (see Japanese Patent Application Laid-Open No. 63-305011)
By using together, accuracy can be further improved.
【0019】[0019]
【発明の効果】本発明の検出方法はABSの車輪パルス
を利用しており、システムの信頼性を上げるとともにコ
ストの低減を図ることができる。また、加速度センサー
により計測された加速度を積分することにより車輌速度
を求めこれを基準として、タイヤの減圧を判断するた
め、4輪同時の減圧でも検出することができる。The detection method according to the present invention utilizes the wheel pulse of the ABS, so that the reliability of the system can be improved and the cost can be reduced. In addition, since the vehicle speed is obtained by integrating the acceleration measured by the acceleration sensor, and based on the obtained vehicle speed, the tire pressure reduction is determined.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平4−271907(JP,A) 特開 昭63−305011(JP,A) 欧州特許出願公開291217(EP,A 1) 仏国特許出願公開2568519(FR,A 1) (58)調査した分野(Int.Cl.7,DB名) B60C 23/00 - 23/08 G01L 17/00 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-271907 (JP, A) JP-A-63-305011 (JP, A) European Patent Application Publication 291217 (EP, A1) French Patent Application Publication 2568519 (FR, A1) (58) Fields investigated (Int. Cl. 7 , DB name) B60C 23/00-23/08 G01L 17/00
Claims (2)
車輪の角速度を検出する工程、 (b)検出された角速度に比例した信号を発生する工
程、 (c)車輌の前後方向加速度を検出する工程、 (d)検出された加速度を積分して車輛の走行速度を求
める工程、 (e)求められた車輛の走行速度に比例する信号を発生
する工程、および (f)前記角速度に比例した信号および車輛の走行速度
に比例する信号を演算処理する工程からなり、 前記信号を演算処理する工程が、正常空気圧で定められ
た速度毎に直進実走行を行ない、速度毎に各車輪の角速
度を求めることにより予め作成されたテーブルであっ
て、タイヤの空気圧が正常時の、車輛の走行速度と車輪
の角速度との関係を示すテーブルから、実走行中の走行
速度における前記テーブル内の車輪の、正常空気圧にお
ける角速度を求め、この正常空気圧での角速度と実走行
中の車輪の角速度とを各車輪毎に比較して、その差が前
記テーブルの車輪の角速度に対して0.05%から0.60%で
あればそのタイヤの異常を警告する装置を作動させる工
程であり、2輪以上の同時減圧が検出可能であることを
特徴とする車輌のタイヤ空気圧の異常を検出する方法。(A) detecting the angular velocity of each wheel equipped with tires of a four-wheeled vehicle; (b) generating a signal proportional to the detected angular velocity; (c) longitudinal acceleration of the vehicle. (D) integrating the detected acceleration to determine a vehicle speed, (e) generating a signal proportional to the determined vehicle speed, and (f) determining the angular velocity. Calculating a proportional signal and a signal proportional to the traveling speed of the vehicle, wherein the step of calculating the signal is determined at normal air pressure.
The vehicle travels straight ahead at each speed, and the angular speed of each wheel at each speed.
A table created in advance by determining the degree
Te, tire pressure is normal, the relationship between the vehicle running speed and the wheel angular velocity from shown to tables, the wheels in the table in the running speed in actual running, the normal air pressure Contact
Seeking kicking angular speed, long the normal and the angular velocity at the air pressure and the wheel angular velocity in the actual running to compare for each wheel, 0.60 percent 0.05% relative to the wheel of the angular velocity of the difference is the table For example, a method of operating a device for warning an abnormality of the tire, wherein the simultaneous decompression of two or more wheels can be detected .
角速度を検出する角速度検出手段、 検出された角速度に比例した信号を発生する角速度信号
発生手段、 車輌の前後方向加速度を検出する加速度検出手段、 検出された加速度を積分して車輛の走行速度を求める積
分手段、 求められた車輛の走行速度に比例する信号を発生する速
度信号発生手段、および前記角速度信号発生手段および
速度信号発生手段から発せられた信号を演算処理する演
算処理手段からなり、 前記演算処理手段が、正常空気圧で定められた速度毎に
直進実走行を行ない、速 度毎に各車輪の角速度を求める
ことにより予め作成されたテーブルであって、タイヤの
空気圧が正常時の、車輛の走行速度と車輪の角速度との
関係を示すテーブルから、実走行中の走行速度における
前記テーブル内の、正常空気圧における角速度を求め、
この正常空気圧での角速度と実走行中の車輪の角速度と
を各車輪毎に比較して、その差が前記テーブルの車輪の
角速度に対して0.05%から0.60%であればそのタイヤの
異常を警告する装置を作動させて、2輪以上の同時減圧
が検出可能であることを特徴とする車輌のタイヤ空気圧
の異常を検出する装置。2. An angular velocity detecting means for detecting an angular velocity of each wheel equipped with tires of a four-wheeled vehicle, an angular velocity signal generating means for generating a signal proportional to the detected angular velocity, and an acceleration for detecting a longitudinal acceleration of the vehicle. Detecting means, integrating means for integrating the detected acceleration to determine the running speed of the vehicle, speed signal generating means for generating a signal proportional to the determined running speed of the vehicle, and said angular speed signal generating means and speed signal generating means And arithmetic processing means for arithmetically processing the signal emitted from the control unit, wherein the arithmetic processing means is provided for each speed determined at normal air pressure.
Performs a straight real run, determine the angular velocity of each wheel in each velocity
A table created in advance by the air pressure in the tire is normal, the relationship between the vehicle running speed and the wheel angular velocity from shown to tables, in the table in the running speed in actual running, normal determine the angular velocity in air pressure,
The angular velocity at this normal air pressure and the angular velocity of the wheels during actual running are
The then compared for each wheel, if 0.60 percent 0.05% relative to the wheel of the angular velocity of the difference is the table actuates the device to warn the abnormality of the tire, 2 or more wheels simultaneous deflation
An apparatus for detecting an abnormality in tire pressure of a vehicle, wherein the apparatus is capable of detecting a tire pressure.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP04340000A JP3129555B2 (en) | 1992-12-21 | 1992-12-21 | Tire pressure abnormality detection method and device |
EP93310322A EP0607690B1 (en) | 1992-12-21 | 1993-12-20 | Method and device for detecting pneumatic abnormalities of tyre |
DE69308203T DE69308203T2 (en) | 1992-12-21 | 1993-12-20 | Method and device for detecting tire defects |
US08/169,397 US5442331A (en) | 1992-12-21 | 1993-12-20 | Method and device for detecting a deflated tire by comparing angular velocity and forward/backward speed data with a data table |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP04340000A JP3129555B2 (en) | 1992-12-21 | 1992-12-21 | Tire pressure abnormality detection method and device |
Publications (2)
Publication Number | Publication Date |
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JPH06183229A JPH06183229A (en) | 1994-07-05 |
JP3129555B2 true JP3129555B2 (en) | 2001-01-31 |
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Application Number | Title | Priority Date | Filing Date |
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JP04340000A Expired - Lifetime JP3129555B2 (en) | 1992-12-21 | 1992-12-21 | Tire pressure abnormality detection method and device |
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JP (1) | JP3129555B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN113459733B (en) * | 2021-08-06 | 2023-07-21 | 常州禄安汽车科技有限公司 | Method for judging simultaneous deficiency of four wheels of vehicle |
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1992
- 1992-12-21 JP JP04340000A patent/JP3129555B2/en not_active Expired - Lifetime
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JPH06183229A (en) | 1994-07-05 |
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