JPH08297063A - Pneumatic pressure detection method for tire - Google Patents

Pneumatic pressure detection method for tire

Info

Publication number
JPH08297063A
JPH08297063A JP10207195A JP10207195A JPH08297063A JP H08297063 A JPH08297063 A JP H08297063A JP 10207195 A JP10207195 A JP 10207195A JP 10207195 A JP10207195 A JP 10207195A JP H08297063 A JPH08297063 A JP H08297063A
Authority
JP
Japan
Prior art keywords
tire
resonance frequency
air pressure
predetermined
pneumatic 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.)
Pending
Application number
JP10207195A
Other languages
Japanese (ja)
Inventor
Toshiyuki Ikeda
俊之 池田
Motohide Takasugi
元英 高杉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to JP10207195A priority Critical patent/JPH08297063A/en
Publication of JPH08297063A publication Critical patent/JPH08297063A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To detect lowering of pneumatic pressure of individual tire surely under any air leakage state by comparing the variation with time in the resonance frequency of tire with a predetermined reference value and deciding the lowering of pneumatic pressure. CONSTITUTION: Each wheel is provided with a speed sensor 1 and a pulse signal corresponding to the rotational speed of wheel is detected and delivered to an arithmetic section 2. The arithmetic section 2 detects the resonance frequency of each tire at a predetermined time interval based on the signal thus received and the resonance frequency is stored in a memory 3 in order to monitor the time variation thereof. More specifically, it is judged that the pneumatic pressure of tire T has lowered when the resonance frequency drops below a predetermined lower limit during a unit time, or when the frequency drops during a unit time exceeds a reference value continuously by a predetermined number of times, or when the total frequency drop for predetermined number of times of detection exceeds a reference value. The pneumatic pressure drop is presented at a display section 4 and alarmed to a driver.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は自動車のタイヤの空気圧
低下を運転者に知らせる装置等に有用なタイヤ空気圧検
知方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire pressure detecting method useful for a device or the like for informing a driver of a decrease in air pressure of an automobile tire.

【0002】[0002]

【従来の技術】従来、自動車に搭載される機能として、
タイヤの空気圧が正常時よりも低下した場合、これを検
知して運転者に知らせる装置が開発されている。その一
例として、タイヤの内部に空気圧の変化に反応する検知
器を取付け、タイヤの空気圧を直接検知するようにした
ものがあるが、この場合はタイヤの内部に加工を必要と
するため、構造が複雑になり、実用化に際して不利であ
る。そこで、タイヤの空気圧を間接的に検知するように
したものが提案されている(特開平5−133831号
公報)。これによれば、車両走行時に車輪の回転速度か
らタイヤの共振周波数成分を含む信号を検出し、検出し
た信号から抽出される共振周波数と空気圧との関係が所
定の基準に対して異なった場合、これを空気圧の低下と
して運転者に警告するようになっている。従って、タイ
ヤ自体には何等加工を必要としないので、構造を簡単に
することができるが、使用者がタイヤやホイールの種別
を変更すると、共振周波数と空気圧との関係における特
性が変わり、予め設定されている基準では正しく検知す
ることができないという欠点がある。また、このような
欠点を解消するために、左右のタイヤにおける共振周波
数を比較し、その差に基づいて一方のタイヤの空気圧低
下を検知するようにしたものが提案されている(特開平
5−330322号)。
2. Description of the Related Art Conventionally, as a function to be mounted on an automobile,
A device has been developed that detects when the tire pressure is lower than normal and notifies the driver of it. As an example, there is one that is equipped with a detector that reacts to changes in air pressure inside the tire and directly detects the air pressure of the tire.In this case, however, processing is required inside the tire, so the structure is It becomes complicated and is disadvantageous for practical use. Therefore, there has been proposed a device in which the air pressure of the tire is indirectly detected (Japanese Patent Laid-Open No. 5-133831). According to this, when a signal including a resonance frequency component of the tire is detected from the rotation speed of the wheel when the vehicle is running, and the relationship between the resonance frequency and the air pressure extracted from the detected signal is different from a predetermined reference, The driver is warned of this as a decrease in air pressure. Therefore, the tire itself does not require any processing, so the structure can be simplified, but when the user changes the type of tire or wheel, the characteristics in the relationship between the resonance frequency and the air pressure change, and the preset However, there is a drawback in that the standard cannot be detected correctly. Further, in order to eliminate such a defect, there has been proposed one in which the resonance frequencies of the left and right tires are compared with each other and the decrease in the air pressure of one of the tires is detected based on the difference (Japanese Patent Application Laid-Open No. Hei 5 (1993) -58). 330322).

【0003】[0003]

【発明が解決しようとする課題】前述したように、左右
のタイヤの空気圧を相対的に比較するようにしたもので
は、タイヤやホイールの種別に関係なく検知を行うこと
ができるが、自然に空気が漏洩したときなど、左右のタ
イヤの空気圧が互いに等しく低下した場合には空気圧の
差が生じないので、各タイヤを相対的に比較しても空気
圧の低下を検知することができないという問題点があっ
た。また、一方のタイヤを応急タイヤとして一時的に種
別の異なるものに交換した場合には、それぞれのタイヤ
の空気圧は正常でも互いに条件が異なるため、相対的に
比較すると一方のタイヤの空気圧が低下したものとして
検知され、誤った警告を発するという問題点があった。
As described above, in the case where the air pressures of the left and right tires are relatively compared with each other, the detection can be performed regardless of the type of the tire or the wheel. If the air pressures of the left and right tires drop equally with each other, such as when there is a leak, the difference in air pressure does not occur, so there is a problem that the drop in air pressure cannot be detected even if the tires are compared relatively. there were. Also, when one of the tires was temporarily replaced with a different type as an emergency tire, the air pressure of each tire was normal, but the conditions were different from each other. There was a problem that it was detected as a thing and issued a false warning.

【0004】本発明は前記問題点に鑑みてなされたもの
であり、その目的とするところは、個々のタイヤにおけ
る空気圧の低下を確実に検知することのできるタイヤ空
気圧検知方法を提供することにある。
The present invention has been made in view of the above problems, and an object of the present invention is to provide a tire air pressure detecting method capable of surely detecting a decrease in air pressure in each tire. .

【0005】[0005]

【課題を解決するための手段】本発明は前記目的を達成
するために、請求項1では、車両走行時におけるタイヤ
の共振周波数成分を含む信号を検出し、検出した信号か
ら抽出される共振周波数に基づいてタイヤの空気圧を検
知するようにしたタイヤ空気圧検知方法において、前記
共振周波数を所定の単位時間おきに検出し、共振周波数
の時間的な変化が所定の基準と相違するか否かを判別す
るようにしている。
In order to achieve the above-mentioned object, the present invention, in claim 1, detects a signal including a resonance frequency component of a tire when a vehicle is running, and extracts a resonance frequency from the detected signal. In the tire air pressure detection method for detecting the tire air pressure based on, the resonance frequency is detected every predetermined unit time, and it is determined whether or not the temporal change of the resonance frequency is different from a predetermined reference. I am trying to do it.

【0006】また、請求項2では、請求項1記載のタイ
ヤ空気圧検知方法において、前記共振周波数が所定の下
限値以下になったか否かを判別するようにしている。
According to a second aspect of the present invention, in the tire air pressure detecting method according to the first aspect, it is determined whether or not the resonance frequency is below a predetermined lower limit value.

【0007】また、請求項3では、請求項1または2記
載のタイヤ空気圧検知方法において、前記共振周波数の
単位時間おきの低下量が所定の基準低下量よりも所定回
数だけ連続して大きかったか否かを判別するようにして
いる。
According to a third aspect of the present invention, in the tire pressure detecting method according to the first or second aspect, whether or not the reduction amount of the resonance frequency per unit time is continuously larger than a predetermined reference reduction amount by a predetermined number of times. I'm trying to determine.

【0008】また、請求項4では、請求項1、2または
3記載のタイヤ空気圧検知方法において、前記共振周波
数の所定時間内における低下量の合計が所定の基準低下
量の合計よりも大きいか否かを判別するようにしてい
る。
According to a fourth aspect of the present invention, in the tire pressure detecting method according to the first, second or third aspect, whether or not the total reduction amount of the resonance frequency within a predetermined time period is larger than the total predetermined reference reduction amount. I'm trying to determine.

【0009】[0009]

【作用】請求項1によれば、所定の単位時間おきに共振
周波数が検出され、共振周波数の時間的変化が所定の基
準と相違するか否かを判別することにより、タイヤの空
気圧の低下が検知されることから、タイヤの種別に関係
なく、しかも複数のタイヤの空気圧を個々に検知するこ
とが可能である。
According to the first aspect of the present invention, the resonance frequency is detected every predetermined unit time, and it is determined whether or not the temporal change of the resonance frequency is different from the predetermined reference. Since it is detected, the air pressures of a plurality of tires can be individually detected regardless of the type of tire.

【0010】また、請求項2によれば、請求項1の作用
に加え、前記共振周波数が所定の下限値以下になったか
否かが判別されることから、例えばタイヤの空気圧が自
然漏洩によって標準の空気圧よりも低下したことが検知
される。
Further, according to claim 2, in addition to the function of claim 1, it is judged whether or not the resonance frequency is equal to or lower than a predetermined lower limit value. It is detected that the air pressure is lower than the air pressure.

【0011】また、請求項3によれば、請求項1または
2の作用に加え、共振周波数の単位時間おきの低下量が
所定の基準低下量よりも所定回数だけ連続して大きかっ
た否かが判別されることから、例えばタイヤの亀裂等に
よって空気が徐々に漏洩したことが検知される。
According to claim 3, in addition to the effect of claim 1 or 2, whether or not the reduction amount of the resonance frequency per unit time is continuously larger than the predetermined reference reduction amount by a predetermined number of times. From the determination, it is detected that the air gradually leaks due to, for example, a crack in the tire.

【0012】また、請求項4によれば、請求項1、2ま
たは3の作用に加え、共振周波数の所定時間内における
低下量の合計が所定の基準低下量の合計よりも大きいか
否かが判別されることから、例えばタイヤの破損等によ
って空気圧が急激に低下したことが検知される。
Further, according to claim 4, in addition to the operation of claim 1, 2 or 3, whether or not the total reduction amount of the resonance frequency within a predetermined time is larger than a predetermined reference reduction amount. From the determination, it can be detected that the air pressure has suddenly dropped due to, for example, damage to the tire.

【0013】[0013]

【実施例】図1乃至図5は本発明の一実施例を示すもの
で、図1はタイヤ空気圧検知装置の概略構成図である。
1 to 5 show one embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of a tire air pressure detecting device.

【0014】このタイヤ空気圧検知装置は、自動車の各
車輪の回転速度をそれぞれ検出する複数の速度センサ1
と、各速度センサ1の検出結果に基づいてタイヤTの空
気圧が正常か否かを判別する演算部2と、演算部2のデ
ータを記憶するメモリ3と、演算部2の指令によって警
告を表示する表示部4とから構成されている。
This tire air pressure detecting device comprises a plurality of speed sensors 1 for detecting the rotational speed of each wheel of the automobile.
And a calculation unit 2 that determines whether the air pressure of the tire T is normal based on the detection result of each speed sensor 1, a memory 3 that stores the data of the calculation unit 2, and a warning is displayed by a command of the calculation unit 2. And a display unit 4 that operates.

【0015】各速度センサ1は、例えばタイヤTの車軸
と一体に回転する円盤の近傍に磁石とコイルからなる検
出器を設け、円盤の回転速度に応じたパルス信号を検出
器から出力するように構成されている。この場合、AB
S(アンチロック・ブレーキ・システム)を搭載した車
両には同等のセンサが設けられているので、これを各速
度センサ1として利用することができる。
Each speed sensor 1 is provided with a detector composed of a magnet and a coil, for example, in the vicinity of a disk that rotates integrally with the axle of the tire T, and outputs a pulse signal corresponding to the rotational speed of the disk from the detector. It is configured. In this case, AB
Since a vehicle equipped with S (anti-lock brake system) is provided with an equivalent sensor, it can be used as each speed sensor 1.

【0016】演算部2はマイクロコンピュータによって
構成され、各速度センサ1、メモリ3及び表示部4に接
続されている。この演算部2では各速度センサ1から送
られた信号のパルス間隔に基づいて車輪の回転速度を演
算し、この回転速度から振動成分を抽出する。この振動
成分は、図2に示すように振動レベルがピークに達する
共振周波数を含み、共振周波数はタイヤTのばね定数に
よって決まる。タイヤTのばね定数はタイヤTの空気圧
に依存するため、図3に示すようにタイヤTの空気圧が
低くなると共振周波数も低下する。即ち、演算部2では
各タイヤTの共振周波数を所定時間おきに検出し、これ
をメモリ3に記憶して共振周波数の時間的変化を監視す
るようになっている。
The calculation unit 2 is composed of a microcomputer and is connected to each speed sensor 1, the memory 3 and the display unit 4. The calculation unit 2 calculates the rotation speed of the wheel based on the pulse interval of the signal sent from each speed sensor 1, and extracts the vibration component from this rotation speed. The vibration component includes a resonance frequency at which the vibration level reaches a peak as shown in FIG. 2, and the resonance frequency is determined by the spring constant of the tire T. Since the spring constant of the tire T depends on the air pressure of the tire T, as shown in FIG. 3, when the air pressure of the tire T decreases, the resonance frequency also decreases. That is, the computing unit 2 detects the resonance frequency of each tire T at predetermined intervals, stores this in the memory 3, and monitors the temporal change in the resonance frequency.

【0017】表示部4は車内の所定位置に設けられ、デ
ィスプレイやパイロットランプ等によって各タイヤTの
空気圧低下を運転者に警告するようになっている。
The display unit 4 is provided at a predetermined position inside the vehicle and is designed to warn the driver of a decrease in the air pressure of each tire T by means of a display, a pilot lamp or the like.

【0018】次に、本実施例のタイヤ空気圧検知装置の
動作を図4に示すフローチャートを参照して説明する。
Next, the operation of the tire pressure detecting device of this embodiment will be described with reference to the flow chart shown in FIG.

【0019】即ち、演算部2においては、初期設定とし
て検出回数n及び異常検知回数mをそれぞれ0とした後
(S1,S2)、共振周波数fn を検出する(S3)。
そして、時間tが経過したならば(S4)、前記検出回
数nに1を加え(S5)、共振周波数fn を検出する
(S6)。ここで、検出した共振周波数fn が予め設定
されている下限値fmin 以下でなければ(S6)、単位
時間tにおける共振周波数の低下量Δfn (=fn-1 −
fn )を算出し(S8)、これをメモリ3に記憶する
(S9)。また、図5の実線に示すようにタイヤTの空
気圧が自然漏洩によって正常に低下した場合の低下量に
基づき、単位時間tにおける共振周波数の基準低下量Δ
fs を予め設定しておく。ここで、図5の破線で示すよ
うにタイヤTの空気圧が異常低下し、検出した共振周波
数fn の低下量Δfn が基準低下量Δfs よりも大きく
なった場合には(S10)、異常検知回数mに1を加え
(S11)、この時の異常検知回数mが予め設定された
上限回数ms よりも少なければ(S12)、ステップS
13に移行する。また、ステップS10において共振周
波数fn の低下量Δfn が基準低下量Δfs 以下のとき
には、異常検知回数mを0とし(S14)、ステップS
13に移行する。次に、ステップS13では、この時点
までに検出した共振周波数fn の低下量Δfn の合計Σ
Δfn と、n回分の基準低下量Δfs の合計ΣΔfs
(=Δfs ×n)とを比較し、ΣΔfn がΣΔfs 以下
のときは前記ステップS4に戻る。そして、単位時間t
おきに前述の動作を繰り返すことにより、例えばタイヤ
Tの空気圧が自然漏洩によって標準の空気圧よりも低下
したときなど、前記ステップS7において共振周波数f
n が下限値fmin 以下になった場合には、表示部4によ
って警告を表示し(S15)、前記ステップS4に戻
る。また、共振周波数fn が下限値fmin 以下にならな
くとも、タイヤTの亀裂等によって空気が徐々に漏洩し
たときなど、前記ステップS10において共振周波数f
n の低下量Δfn が連続して基準低下量Δfs 以下にな
り、前記ステップS12において異常検知回数mが上限
回数ms に達した場合には、表示部4によって警告を表
示する(S15)。更に、異常検知回数mが上限回数m
s に達しなくとも、タイヤTの破損等によって空気圧が
急激に低下したときなど、前記ステップS13において
ΣΔfn がΣΔfs よりも大きくなった場合には、表示
部4によって警告を表示する(S15)。尚、前記検知
動作は全てのタイヤTに対して個々に行われる。
That is, in the arithmetic unit 2, the number of detections n and the number of abnormality detections m are initially set to 0 (S1, S2), and then the resonance frequency fn is detected (S3).
When the time t has elapsed (S4), 1 is added to the number of times of detection n (S5), and the resonance frequency fn is detected (S6). Here, if the detected resonance frequency fn is not less than or equal to the preset lower limit value fmin (S6), the decrease amount Δfn (= fn-1 − of the resonance frequency in the unit time t).
fn) is calculated (S8) and stored in the memory 3 (S9). Further, as shown by the solid line in FIG. 5, the reference decrease amount Δ of the resonance frequency at the unit time t is based on the decrease amount when the air pressure of the tire T is normally decreased by natural leakage.
Set fs in advance. Here, when the air pressure of the tire T is abnormally decreased as shown by the broken line in FIG. 5 and the detected decrease amount Δfn of the resonance frequency fn is larger than the reference decrease amount Δfs (S10), the abnormality detection number m Is incremented by 1 (S11), and if the abnormality detection count m at this time is less than the preset upper limit count ms (S12), step S
Move to 13. If the reduction amount Δfn of the resonance frequency fn is equal to or less than the reference reduction amount Δfs in step S10, the abnormality detection number m is set to 0 (S14), and step S14 is performed.
Move to 13. Next, in step S13, the sum Σ of the reduction amounts Δfn of the resonance frequency fn detected up to this point.
The sum of Δfn and the reference decrease amount Δfs for n times ΣΔfs
(= Δfs × n), and when ΣΔfn is equal to or less than ΣΔfs, the process returns to step S4. And the unit time t
By repeating the above operation every other time, for example, when the air pressure of the tire T becomes lower than the standard air pressure due to natural leakage, in step S7, the resonance frequency f
When n becomes equal to or smaller than the lower limit value fmin, a warning is displayed on the display unit 4 (S15), and the process returns to step S4. Even if the resonance frequency fn does not fall below the lower limit value fmin, if the air leaks gradually due to cracks in the tire T, etc.
When the decrease amount Δfn of n becomes equal to or less than the reference decrease amount Δfs and the number m of times of abnormality detection reaches the upper limit number ms in step S12, a warning is displayed by the display unit 4 (S15). Furthermore, the abnormality detection number m is the upper limit number m
If ΣΔfn becomes larger than ΣΔfs in step S13, such as when the air pressure drops sharply due to damage to the tire T or the like even if s does not reach s, a warning is displayed by the display unit 4 (S15). The detection operation is individually performed on all the tires T.

【0020】このように、本実施例によれば、単位時間
tおきに共振周波数fn を検出し、検出した共振周波数
fn が所定の下限値fmin 以下になった場合、または各
時間tごとの低下量Δfn が所定回数ms だけ連続して
基準低下量Δfs よりも大きかった場合、或いはn回だ
け検出した共振周波数fn の低下量Δfn の合計ΣΔf
n がn回分の基準低下量Δfs の合計ΣΔfs よりも大
きかった場合の何れかを判別することにより、タイヤT
の空気圧の低下を検知するようにしたので、タイヤTの
種別に関係なく、しかも各タイヤTの空気圧を個々に検
知することができ、自然漏洩による空気圧の低下は勿論
のこと、タイヤTの亀裂、破損その他如何なる空気の漏
洩状態においても空気圧の低下を速やかに検知すること
ができる。
As described above, according to the present embodiment, the resonance frequency fn is detected at every unit time t, and when the detected resonance frequency fn becomes equal to or lower than the predetermined lower limit value fmin, or decreases at each time t. When the amount Δfn is continuously larger than the reference decrease amount Δfs for the predetermined number of times ms, or the total amount ΣΔf of the decrease amount Δfn of the resonance frequency fn detected only n times.
By determining whether n is larger than the sum ΣΔfs of the reference decrease amounts Δfs for n times, the tire T
Since the decrease in the air pressure of the tire T is detected, the air pressure of each tire T can be detected individually regardless of the type of the tire T, and the decrease of the air pressure due to natural leakage can be obtained, and the tire T can be cracked. It is possible to promptly detect a decrease in air pressure in any state of air leakage such as breakage.

【0021】[0021]

【発明の効果】以上説明したように、請求項1によれ
ば、タイヤの種別に関係なく、しかも複数のタイヤの空
気圧を個々に検知することができるので、タイヤの空気
圧の低下を確実に検知することができる。
As described above, according to the first aspect, it is possible to detect the air pressures of a plurality of tires individually regardless of the type of the tires. Therefore, it is possible to reliably detect the decrease of the tire air pressure. can do.

【0022】また、請求項2、3及び4によれば、請求
項1の効果に加え、タイヤの空気圧が自然漏洩によって
標準の空気圧よりも低下した場合、またはタイヤの亀裂
等によって空気が徐々に漏洩した場合、或いはタイヤの
破損等によって空気圧が急激に低下した場合を検知する
ことができるので、如何なる空気の漏洩状態においても
空気圧の低下を速やかに検知することができる。
According to claims 2, 3 and 4, in addition to the effect of claim 1, when the air pressure of the tire becomes lower than the standard air pressure due to natural leakage, or when the air is gradually cracked due to a crack of the tire or the like. Since it is possible to detect a leak or a sudden drop in air pressure due to tire damage or the like, it is possible to promptly detect a drop in air pressure in any leaked state of air.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例を示すタイヤ空気圧検知装置
の概略構成図
FIG. 1 is a schematic configuration diagram of a tire air pressure detection device showing an embodiment of the present invention.

【図2】周波数と振動レベルとの関係を示す図FIG. 2 is a diagram showing a relationship between frequency and vibration level.

【図3】空気圧と共振周波数との関係を示す図FIG. 3 is a diagram showing a relationship between air pressure and resonance frequency.

【図4】演算部の動作を示すフローチャートFIG. 4 is a flowchart showing the operation of the arithmetic unit.

【図5】共振周波数の時間的変化を示す図FIG. 5 is a diagram showing a change in resonance frequency with time.

【符号の説明】[Explanation of symbols]

1…速度センサ、2…演算部、3…メモリ、4…表示
部。
1 ... Speed sensor, 2 ... Calculation part, 3 ... Memory, 4 ... Display part.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 車両走行時におけるタイヤの共振周波数
成分を含む信号を検出し、検出した信号から抽出される
共振周波数に基づいてタイヤの空気圧を検知するように
したタイヤ空気圧検知方法において、 前記共振周波数を所定の単位時間おきに検出し、共振周
波数の時間的な変化が所定の基準と相違するか否かを判
別することを特徴とするタイヤ空気圧検知方法。
1. A tire air pressure detection method for detecting a signal including a resonance frequency component of a tire when a vehicle is running, and detecting a tire air pressure based on a resonance frequency extracted from the detected signal. A method for detecting tire air pressure, which comprises detecting a frequency every predetermined unit time and determining whether or not a temporal change of the resonance frequency is different from a predetermined reference.
【請求項2】 前記共振周波数が所定の下限値以下にな
ったか否かを判別することを特徴とする請求項1記載の
タイヤ空気圧検知方法。
2. The tire air pressure detection method according to claim 1, wherein it is determined whether or not the resonance frequency is equal to or lower than a predetermined lower limit value.
【請求項3】 前記共振周波数の単位時間おきの低下量
が所定の基準低下量よりも所定回数だけ連続して大きか
ったか否かを判別することを特徴とする請求項1または
2記載のタイヤ空気圧検知方法。
3. The tire pressure according to claim 1, wherein it is determined whether or not the amount of decrease in the resonance frequency per unit time is continuously larger than a predetermined reference amount of decrease by a predetermined number of times. Detection method.
【請求項4】 前記共振周波数の所定時間内における低
下量の合計が所定の基準低下量の合計よりも大きいか否
かを判別することを特徴とする請求項1、2または3記
載のタイヤ空気圧検知方法。
4. The tire pressure according to claim 1, wherein it is determined whether or not a total reduction amount of the resonance frequency within a predetermined time is larger than a predetermined reference reduction amount total. Detection method.
JP10207195A 1995-04-26 1995-04-26 Pneumatic pressure detection method for tire Pending JPH08297063A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10207195A JPH08297063A (en) 1995-04-26 1995-04-26 Pneumatic pressure detection method for tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10207195A JPH08297063A (en) 1995-04-26 1995-04-26 Pneumatic pressure detection method for tire

Publications (1)

Publication Number Publication Date
JPH08297063A true JPH08297063A (en) 1996-11-12

Family

ID=14317542

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10207195A Pending JPH08297063A (en) 1995-04-26 1995-04-26 Pneumatic pressure detection method for tire

Country Status (1)

Country Link
JP (1) JPH08297063A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100335303C (en) * 2003-05-19 2007-09-05 汕头高新技术产业开发区东奇汽车科技有限公司 Method for monitoring pressure vehicle tyre and system of realizing said method
US7388478B2 (en) 2004-04-28 2008-06-17 Denso Corporation Apparatus for detecting tire inflation pressure
JP2019111896A (en) * 2017-12-22 2019-07-11 住友ゴム工業株式会社 Detection device for pressure reduction in tire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100335303C (en) * 2003-05-19 2007-09-05 汕头高新技术产业开发区东奇汽车科技有限公司 Method for monitoring pressure vehicle tyre and system of realizing said method
US7388478B2 (en) 2004-04-28 2008-06-17 Denso Corporation Apparatus for detecting tire inflation pressure
JP2019111896A (en) * 2017-12-22 2019-07-11 住友ゴム工業株式会社 Detection device for pressure reduction in tire

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