JPH03262715A - Tire abnormality judging device - Google Patents
Tire abnormality judging deviceInfo
- Publication number
- JPH03262715A JPH03262715A JP6029890A JP6029890A JPH03262715A JP H03262715 A JPH03262715 A JP H03262715A JP 6029890 A JP6029890 A JP 6029890A JP 6029890 A JP6029890 A JP 6029890A JP H03262715 A JPH03262715 A JP H03262715A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- temperature
- surface temperature
- sensor
- abnormality
- 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
Links
- 230000005856 abnormality Effects 0.000 title claims abstract description 61
- 230000002159 abnormal effect Effects 0.000 claims abstract description 7
- 230000000630 rising effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 230000009172 bursting Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Emergency Alarm Devices (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、タイヤの表面温度に基づいてバーストの危険
性等のタイヤ異常を検出するタイヤ異常判定装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a tire abnormality determination device that detects tire abnormalities such as the risk of bursting based on the tire surface temperature.
（従来の技術）
自動車の走行中にバンク等によってタイヤの空気圧が減
少するとタイヤの表面温度が異常上昇する。かかる点に
鑑み、例えば本出願人によって出願された特願平１−５
３５１４号出願に記載されている様に、温度センサを用
いてタイヤの表面温度を測定し、その測定値からタイヤ
の表面温度の異常上昇を検出し、それによってタイヤ異
常、即ちバンク等の空気圧の異常によるタイヤバースト
の危険性等を検知することが考えられている。(Prior Art) When the air pressure of a tire decreases due to banking or the like while a car is running, the surface temperature of the tire increases abnormally. In view of this point, for example, the patent application No. 1-5 filed by the present applicant
As described in the No. 3514 application, a temperature sensor is used to measure the surface temperature of a tire, and an abnormal increase in the tire surface temperature is detected from the measured value. It is being considered to detect the risk of tire burst due to an abnormality.
その様なタイヤの表面温度によるタイヤ異常検知システ
ムの具体例としては、例えば自動車の走行中のタイヤ表
面温度を、特にトレッド表面の温度を温度センサにより
検出し、その検出温度が予め設定された所定のしきい値
を超えた場合タイヤの表面温度が異常上昇しておりタイ
ヤバーストの危険性等のタイヤ異常があると判断し、警
報を発するように構成することが考えられる。As a specific example of such a tire abnormality detection system based on the tire surface temperature, for example, the tire surface temperature while a car is running, especially the tread surface temperature, is detected by a temperature sensor, and the detected temperature is set at a predetermined temperature. If the threshold value is exceeded, it may be determined that the surface temperature of the tire has increased abnormally and there is a tire abnormality such as a risk of tire burst, and a warning may be issued.
（発明が解決しようとする課題）
しかしながら、タイヤの表面温度は、バンク等のタイヤ
異常の場合には勿論上昇するが、それ以外の様々な外的
要因、例えば外気温や路面温度等のタイヤの雰囲気温度
の上昇によっても上昇する。(Problem to be Solved by the Invention) However, the surface temperature of a tire naturally increases in the case of a tire abnormality such as a bank, but it also increases due to various external factors such as outside temperature and road surface temperature. It also increases as the ambient temperature increases.
また、温度センサの側においても、例えば白金抵抗体を
利用した放射熱吸収型（赤外線吸収型）温度センサの場
合の様に、そのセンサの雰囲気温度（センサケース等の
センサ自体の温度も含む）によってセンサの出力が変動
し、従ってタイヤの表面温度は変化していなくともセン
サの雰囲気温度が上昇したことによって検出温度が上昇
してしまうことがある。Also, on the temperature sensor side, for example, in the case of a radiant heat absorption type (infrared absorption type) temperature sensor using a platinum resistor, the ambient temperature of the sensor (including the temperature of the sensor itself such as the sensor case) Therefore, even if the tire surface temperature does not change, the detected temperature may rise due to an increase in the ambient temperature of the sensor.
即ち、上記の様に、温度センサからの出力値（タイヤ表
面温度の検出値）は、タイヤの雰囲気温度やセンサの雰
囲気温度等の外的要因によっても変化するので、上記セ
ンサの出力値をそのまま単に予め設定されたしきい値と
大小比較するのみでタイヤの異常判定を行なう場合には
、その様な外的要因による変化分（ノイズ）を含んだま
まの値に基づく異常判定となり、異常判定の信頼性が低
いという問題がある。That is, as mentioned above, the output value from the temperature sensor (detected value of tire surface temperature) also changes depending on external factors such as the ambient temperature of the tire and the ambient temperature of the sensor, so the output value of the above sensor cannot be used as is. If tire abnormality is determined simply by comparing the size with a preset threshold value, the abnormality determination will be based on the value that still includes changes (noise) due to such external factors, and the abnormality determination will be There is a problem of low reliability.
本発明の目的は、上記事情に鑑み、上記外的要因に左右
されることなく信頼性の高い判定を行なうことのできる
タイヤ異常判定装置を提供することにある。In view of the above-mentioned circumstances, an object of the present invention is to provide a tire abnormality determination device that can perform highly reliable determination without being influenced by the above-mentioned external factors.
（課題を解決するための手段）
本願の第１の発明は、上記目的を達成するため、タイヤ
の表面温度を検出するタイヤ温度センサと、該センサに
より検出されたタイヤ表面温度の時間に対する変化率を
算出する変化率算出手段と、該算出手段により算出され
た変化率に基づいてタイヤ表面温度が異常上昇したか否
かの判定を行なう異常判定手段とを備えて成ることを特
徴とする。(Means for Solving the Problems) In order to achieve the above object, the first invention of the present application provides a tire temperature sensor that detects the surface temperature of a tire, and a rate of change over time of the tire surface temperature detected by the sensor. The present invention is characterized by comprising: a change rate calculation means for calculating the change rate; and an abnormality determination means for determining whether the tire surface temperature has abnormally increased based on the change rate calculated by the calculation means.
本願の第２の発明は、上記目的を達成するため、タイヤ
の表面温度を検出するタイヤ温度センサと、該センサに
より検出されたタイヤ表面温度が所定の七きい値より大
のときにタイヤ表面温度の異常上昇と判定する異常判定
手段と、上記タイヤまたはタイヤ温度センサの雰囲気温
度を検出する雰囲気温度センサと、該雰囲気温度センサ
により検出された雰囲気温度に応じて上記しきい値を変
更するしきい値変更手段とを備えて成ることを特徴とす
る。In order to achieve the above object, the second invention of the present application provides a tire temperature sensor that detects the surface temperature of a tire, and a tire surface temperature sensor that detects the tire surface temperature when the tire surface temperature detected by the sensor is greater than a predetermined threshold value. abnormality determining means for determining an abnormal increase in temperature; an atmospheric temperature sensor for detecting the atmospheric temperature of the tire or the tire temperature sensor; and a threshold for changing the threshold according to the atmospheric temperature detected by the atmospheric temperature sensor. and a value changing means.
本願の第３の発明は、上記目的を達成するため、タイヤ
の表面温度を検出するタイヤ温度センサと、該センサに
より検出された複数のタイヤの表面温度を比較してその
温度差を算出する温度差算出手段と、該温度差算出手段
により算出された温度差が所定のしきい値より大のとき
にタイヤ表面温度の異常上昇と判定する異常判定手段と
を備えて成ることを特徴とする。In order to achieve the above object, the third invention of the present application provides a tire temperature sensor that detects the surface temperature of a tire, and a temperature sensor that compares the surface temperatures of a plurality of tires detected by the sensor and calculates the temperature difference. The present invention is characterized in that it comprises a difference calculation means, and an abnormality determination means that determines that the tire surface temperature has increased abnormally when the temperature difference calculated by the temperature difference calculation means is larger than a predetermined threshold value.
（作 用）
上記第１の発明においては、タイヤ表面温度の時間に対
する変化率（上昇率）に基づいて例えばその変化率が所
定のしきい値より大であるか否かによりタイヤの異常判
定（タイヤ表面温度が異常上昇したか否かの判定）が行
なわれる。(Function) In the first invention, tire abnormality determination ( A determination is made as to whether or not the tire surface temperature has increased abnormally.
前述の様にタイヤがパンク等の異常を起こしたときには
急激にタイヤ表面温度が上昇するが、タイヤの雰囲気温
度やタイヤセンサの雰囲気温度は急激には上昇せず、そ
れらに起因するセンサ出力値の上昇は極めてゆるやかで
あって時間に対する上昇率としてはタイヤ異常の場合に
比して極めて小さい値となる。As mentioned above, when a tire experiences an abnormality such as a puncture, the tire surface temperature rises rapidly, but the ambient temperature of the tire and the ambient temperature of the tire sensor do not rise rapidly, and the sensor output value due to these The increase is extremely gradual, and the rate of increase over time is extremely small compared to the case of tire abnormality.
従って、上述の様にタイヤ表面温度の変化率に基づいて
異常判定を行なうようにすれば、タイヤの雰囲気温度変
化やタイヤ温度センサの雰囲気温度変化等の外的要因に
よる影響を受けない信頼性の高いタイヤの異常判定を行
なうことができる。Therefore, if abnormalities are determined based on the rate of change in the tire surface temperature as described above, reliability can be improved without being affected by external factors such as changes in the tire's ambient temperature or the tire temperature sensor's ambient temperature. It is possible to determine whether a tire has a high level of abnormality.
上記第２の発明においては、異常か否かの基準となるし
きい値をタイヤの雰囲気温度またはタイヤ温度センサの
雰囲気温度（センサケース温度等のセンサ自体の温度も
含む）に応じて変化させてタイヤの異常判定が行なわれ
る。In the second aspect of the invention, the threshold value serving as a reference for determining whether or not there is an abnormality is changed depending on the ambient temperature of the tire or the ambient temperature of the tire temperature sensor (including the temperature of the sensor itself such as the sensor case temperature). A tire abnormality determination is performed.
従って、タイヤ温度センサの出力値そのものがタイヤの
雰囲気温度やタイヤ温度センサの雰囲気温度等の外的要
因による変化分を含んでいても、その変化分は異常判定
の際それらの外的要因に基づいてしきい値を変化させる
ことによりキャンセルでき、よって上記外的要因による
影響を受けない信頼性の高い異常判定を行なうことがで
きる。Therefore, even if the output value of the tire temperature sensor itself includes changes due to external factors such as the ambient temperature of the tire and the ambient temperature of the tire temperature sensor, the changes will be based on those external factors when determining an abnormality. This can be canceled by changing the threshold value, making it possible to perform a highly reliable abnormality determination that is not affected by the above-mentioned external factors.
上記第３の発明においては、複数のタイヤの表面温度検
出値を比較し、その差に基づいてタイヤの異常判定が行
なわれる。In the third aspect of the invention, the surface temperature detection values of a plurality of tires are compared, and a tire abnormality determination is performed based on the difference.
上記タイヤの雰囲気温度変化やタイヤ温度センサの雰囲
気温度変化等の外的要因によるセンサ出力値の変化は各
タイヤについてほぼ同様に発生する。従って、各タイヤ
例えば左右前輪のタイヤについて検出温度の差を取れば
、その温度差には上記外的要因による変化分は含まれて
おらず、よってその温度差に基づいてタイヤ異常判定を
行なう、例えばその温度差が所定のしきい値より大のと
きは温度の高い方のタイヤの表面温度が異常上昇してる
と判定するようにすれば、上記外的要因による影響を受
けない信頼性の高い異常判定を行なうことができる。Changes in the sensor output value due to external factors such as changes in the ambient temperature of the tire and changes in the ambient temperature of the tire temperature sensor occur approximately the same for each tire. Therefore, if the difference in the detected temperature of each tire, for example, the left and right front tires, is determined, the temperature difference does not include the change due to the above external factors, and therefore tire abnormality is determined based on the temperature difference. For example, if the temperature difference is greater than a predetermined threshold, it can be determined that the surface temperature of the tire with the higher temperature has increased abnormally, resulting in a highly reliable tire that is not affected by the external factors mentioned above. Abnormality can be determined.
（実 施 例）
以下、図面を参照しながら本発明の実施例について詳細
に説明する。(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
まず、第１の発明の実施例について説明する。First, an embodiment of the first invention will be described.
第１図は第１の発明の一実施例を示すブロック図である
。図示の実施例は、前後左右のそれぞれのタイヤの表面
温度を検出するタイヤ温度センサ２ＦＬ、２ＦＲ，２Ｒ
Ｌ、２ＲＲと、該タイヤ温度センサから入力された各タ
イヤの表面温度の時間に対する変化率（上昇率）を算出
する変化率算出手段４と、該算出手段４によって算出さ
れた各タイヤの表面温度変化率に基づいてそれぞれのタ
イヤの表面温度が異常上昇したか否かを判定する異常判
定手段６と、該異常判定手段６によって異常上昇したと
判定された場合にその判定を受けて運転者等に警報を発
するランプやブザー等の警報手段８とを備えて成る。FIG. 1 is a block diagram showing an embodiment of the first invention. The illustrated embodiment includes tire temperature sensors 2FL, 2FR, and 2R that detect the surface temperature of each of the front, rear, left, and right tires.
L, 2RR, a rate of change calculation means 4 for calculating the rate of change (increase rate) over time in the surface temperature of each tire input from the tire temperature sensor, and the surface temperature of each tire calculated by the calculation means 4. Abnormality determination means 6 determines whether the surface temperature of each tire has increased abnormally based on the rate of change, and when the abnormality determination means 6 determines that the surface temperature has increased abnormally, a driver etc. The alarm means 8, such as a lamp or a buzzer, is provided to issue an alarm.
上記タイヤの表面温度変化率に基づくタイヤ異常判定の
具体例を挙げると次の通りである。A specific example of tire abnormality determination based on the tire surface temperature change rate is as follows.
例えば、第２図に示す様に、各センサ２ＦＬ。For example, as shown in FIG. 2, each sensor 2FL.
２ＦＲ，２ＲＬ、２ＲＲの出力（タイヤ表面の検出温度
） ＴＰＬ、 ＴＰＲ，ＴＲＬ、 ＴＲＲに基づいて各
タイヤの時間に対する表面温度変化率↑（↑ＦＬ＋ ↑
ＰＲｒ ↑ＲＬ＋ ↑ＲＲ）を算出し、各変化率↑をそ
れぞれ予め設定された所定のしきい値ＴＴＨと比較し、
変化率↑が上記所定のしきい値Ｔ。Ｈより大であるとき
はそのタイヤの表面温度が異常上昇していると判定し、
警報を発するように構成することができる。Output of 2FR, 2RL, 2RR (detected temperature of tire surface) Based on TPL, TPR, TRL, and TRR, the rate of change in surface temperature of each tire over time ↑ (↑FL+ ↑
PRr ↑RL+ ↑RR) is calculated, and each rate of change ↑ is compared with a predetermined threshold TTH set in advance,
The rate of change ↑ is the predetermined threshold T. If it is greater than H, it is determined that the surface temperature of the tire has increased abnormally,
It can be configured to issue an alarm.
また、第３図に示す様に、第２図の場合と同様にして各
タイヤの時間に対する表面温度変化率↑ＦＬ＋ ↑ＦＲ
＋ ↑れ、↑ＲＲを算出し、左右のタイヤの表面温度変
化率の差、例えば１↑ＰＬ−↑ＰＲＩおよび１↑ＲＬ−
↑ＲＲＩを算出し、あるいは前後のタイヤの表面温度変
化率の差、例えば１↑ＰＬ−↑ＲＬおよび１↑ＰＲ−↑
ＲＲＩを算出し、それらの差を予め設定された所定のし
きい値ＴＴＨと比較し、差がそのＴＴＨより大であると
きは温度の高い方のタイヤの表面温度が異常上昇してい
ると判定し、警報を発するようにしても良い。Also, as shown in Figure 3, the rate of change in surface temperature of each tire over time ↑FL + ↑FR in the same manner as in Figure 2.
+ ↑RE, ↑RR are calculated, and the difference in surface temperature change rate of the left and right tires, for example, 1↑PL-↑PRI and 1↑RL-
↑Calculate the RRI, or calculate the difference in surface temperature change rate between the front and rear tires, such as 1↑PL-↑RL and 1↑PR-↑
The RRI is calculated and the difference between them is compared with a predetermined threshold TTH, and if the difference is greater than the TTH, it is determined that the surface temperature of the higher temperature tire has increased abnormally. However, a warning may be issued.
また、第４図に示す様に、第２図の場合と同様にして各
タイヤの時間に対する表面温度変化率↑ＰＬ＋ ↑ＰＲ
＋ ↑ＲＬ＋ ↑ＲＲを算出し、それらの変化率の中か
ら最大の変化率（最大上昇率）↑１．８を選出し、その
↑１．８と残りの３つの変化率の平均↑Ａｖ□との差↑
、、１−↑ＡＶＥを予め設定された所定のしきい値Ｔ７
Ｈと比較し、上記差がＴＴＨまり大のきにはその最大変
化率を示したタイヤの表面温度が異常上昇していると判
定し、警報を発するようにしても良い。In addition, as shown in Figure 4, in the same manner as in Figure 2, the surface temperature change rate of each tire with respect to time ↑PL + ↑PR
+ ↑RL+ ↑RR, select the maximum rate of change (maximum rate of increase) ↑1.8 from those rates of change, and calculate the average of that ↑1.8 and the remaining three rates of change ↑Av□ Difference with ↑
,, 1-↑AVE is set in advance as a predetermined threshold T7
When the difference is greater than TTH, it may be determined that the surface temperature of the tire exhibiting the maximum rate of change has increased abnormally, and an alarm may be issued.
また、第５図に示す様に、上記第２．３．４図の場合に
おいてそれぞれ↑、左右の差もしくは前後の差および↑
１．１−↑ＡｖＥがＴＴＨより大であっても直ちにタイ
ヤ異常とは判定せず、その↑等がＴＴＨより大である状
態が一定時間継続した場合にタイヤの表面温度が異常上
昇していると判定し、警報を発するようにしても良い。In addition, as shown in Figure 5, in the case of Figure 2.3.4 above, ↑, left and right difference or front and back difference, and ↑
1.1- Even if ↑AvE is greater than TTH, it is not immediately determined that the tire is abnormal, but if the condition in which ↑ etc. is greater than TTH continues for a certain period of time, the tire surface temperature has increased abnormally. It may be determined that this is the case, and an alarm may be issued.
さらには、同一コースを何回も周回するレーシングカー
の場合には、例えばコース中に所定の地点を定め、その
地点における前回の周回時のタイヤ表面温度と今回の周
回時のタイヤ表面温度とを比較し、その差が予め設定さ
れた所定のしきい値より大となった場合には上記と同様
に警報を発するようにしても良い。この方法は、実質的
には上記第２図に示す方法と同一である。Furthermore, in the case of a racing car that laps the same course many times, for example, a predetermined point is set on the course, and the tire surface temperature at that point during the previous lap and the tire surface temperature during the current lap are calculated. The comparison may be made, and if the difference is greater than a predetermined threshold value, an alarm may be issued in the same manner as above. This method is substantially the same as the method shown in FIG. 2 above.
前述の様に、タイヤがパンク等の異常を起こしたときに
は急激にタイヤ表面温度が上昇するが、タイヤの雰囲気
温度やタイヤ温度センサの雰囲気温度は急激には上昇せ
ず、それらの外的要因に起因するタイヤ温度センサ出力
値の上昇は極めてゆるやかであって温度上昇率としては
タイヤ異常の場合に比して極めて小さい値となる。従っ
て、上述の様にタイヤ表面温度の変化率に基づいて異常
判定を行なうようにすれば、タイヤの雰囲気温度変化や
タイヤ温度センサの雰囲気温度変化等の外的要因による
影響を受けない信頼性の高いタイヤの異常判定を行なう
ことができる。As mentioned above, when a tire experiences an abnormality such as a puncture, the tire surface temperature rises rapidly, but the ambient temperature of the tire and the ambient temperature of the tire temperature sensor do not rise rapidly, and are dependent on these external factors. The resulting increase in the output value of the tire temperature sensor is extremely gradual, and the temperature increase rate is extremely small compared to the case of tire abnormality. Therefore, if abnormalities are determined based on the rate of change in the tire surface temperature as described above, reliability can be improved without being affected by external factors such as changes in the tire's ambient temperature or the tire temperature sensor's ambient temperature. It is possible to determine whether a tire has a high level of abnormality.
次に、第２の発明の実施例について説明する。Next, an embodiment of the second invention will be described.
第６図は第２の発明の一実施例を示すブロック図である
。図示の実施例は、前後左右のそれぞれのタイヤの表面
温度を検出するタイヤ温度センサ２ＦＬ、２ＦＲ，２Ｒ
Ｌ、２ＲＲと、該タイヤ温度センサから入力された各タ
イヤの表面温度を所定のしきい値と比較してタイヤの表
面温度がしきい値より大であるときはそのタイヤの表面
温度が異常上昇していると判定する異常判定手段６と、
該異常判定手段６による異常判定を受けて運転者等に警
報を発する警報手段８と、上記タイヤの雰囲気温度また
はタイヤ温度センサの雰囲気温度を検出する雰囲気温度
センサ１０と、該センサ１０によって検出された雰囲気
温度に応じて上記しきい値を変更するしきい値変更手段
１２とを備えて成る。FIG. 6 is a block diagram showing an embodiment of the second invention. The illustrated embodiment includes tire temperature sensors 2FL, 2FR, and 2R that detect the surface temperature of each of the front, rear, left, and right tires.
L, 2RR, and the surface temperature of each tire inputted from the tire temperature sensor are compared with a predetermined threshold value, and if the surface temperature of the tire is higher than the threshold value, the surface temperature of that tire is abnormally increased. an abnormality determining means 6 for determining that the
An alarm means 8 that issues a warning to the driver etc. upon receiving an abnormality determination by the abnormality determination means 6; an atmospheric temperature sensor 10 that detects the atmospheric temperature of the tire or the atmospheric temperature of the tire temperature sensor; threshold value changing means 12 for changing the threshold value according to the ambient temperature.
上記実施例においては、第７図に示す様に、各タイヤの
表面温度Ｔ （ＴＰＬＩ ＴＰＲＩ ＴＲＬ、 Ｔ＄ｌ
Ｒ）が各タイヤ温度センサ２ＰＬ、２ＦＲ，２ＲＬ。In the above embodiment, as shown in FIG. 7, the surface temperature T (TPLI TPRI TRL, T$l
R) is each tire temperature sensor 2PL, 2FR, 2RL.
２ＲＲから異常判定手段６に入力され、一方雰囲気温度
センサｌＯによって検出されたタイヤまたはタイヤ温度
センサの雰囲気温度１００丁が上記しきい値変更手段１
２に入力され、該しきい値変更手段１２により上記７０
０丁に基づき上記しきい値Ｔ１８が適宜変更され、上記
異常判定手段６によりその変更されたしきい値ＴＴＨと
各タイヤの表面温度Ｔとが比較され、その表面温度Ｔが
しきい値ＴＴ）ｌより大であるときはタイヤの表面温度
が異常上昇していると判定し、その判定に基づいて警報
が発せられる。2RR is input to the abnormality determination means 6, and on the other hand, the 100 tires or the ambient temperature of the tire temperature sensor detected by the ambient temperature sensor 1O is inputted to the threshold value changing means 1.
2, and the threshold value changing means 12 inputs the above 70
The threshold value T18 is changed as appropriate based on the 0 tires, and the abnormality determining means 6 compares the changed threshold value TTH with the surface temperature T of each tire, and the surface temperature T is the threshold value TT). When it is greater than 1, it is determined that the tire surface temperature has increased abnormally, and an alarm is issued based on this determination.
上記雰囲気温度Ｔ ＯＵＴとは、タイヤの雰囲気温度お
よび／またはタイヤ温度センサの雰囲気温度（センサケ
ース等のセンサ自体の温度も含む）であって、例えば外
気温、路面温度、タイヤ温度センサのセンサケース温度
等を使用することができる。The above-mentioned ambient temperature T OUT refers to the ambient temperature of the tire and/or the ambient temperature of the tire temperature sensor (including the temperature of the sensor itself such as the sensor case), such as the outside temperature, road surface temperature, and the sensor case of the tire temperature sensor. Temperature, etc. can be used.
また、上記雰囲気温度Ｔ ｏｕＴに基づくしきい値ＴＴ
Ｈの変更は、その雰囲気温度Ｔ。ＬＩＴの変化により各
タイヤ温度センサの出力値が変化する方向に変化させて
行なえば良く、通常は例えば第８図に示す様にＴ。ｕＴ
が上昇するとＴＴＨも上昇するように変化させれば良い
。In addition, the threshold value TT based on the above ambient temperature T outT
H is changed by the ambient temperature T. This can be done by changing the output value of each tire temperature sensor in the direction of change due to the change in LIT, and usually, for example, T as shown in FIG. uT
What is necessary is to change it so that when TTH increases, TTH also increases.
上述の様にタイヤやタイヤ温度センサの雰囲気温度に基
づいてしきい値を変化させれば、タイヤ温度センサの出
力値がその様な外的要因に起因する変化分を含んでいて
もそれらの変化分をタイヤの異常判定の際キャンセルす
ることができ、よってそれらの外的要因に左右されない
信頼性の高い異常判定を行なうことができる。As mentioned above, if the threshold value is changed based on the ambient temperature of the tire or the tire temperature sensor, even if the output value of the tire temperature sensor includes changes caused by such external factors, those changes will be ignored. Therefore, highly reliable abnormality determination can be performed that is not influenced by these external factors.
次に、第３の発明の実施例について説明する。Next, an embodiment of the third invention will be described.
第９図は第３の発明の一実施例を示すブロック図である
。図示の実施例は、前後左右のそれぞれのタイヤの表面
温度を検出するタイヤ温度センサ２ＦＬ、２ＰＲ，２Ｒ
Ｌ、２ＲＲと、該タイヤ温度センサから入力された各タ
イヤの表面温度の差を算出する温度差算出手段１４と、
該算出手段１４によって算出された温度差と予め設定さ
れた所定のしきい値とを比較し、温度差がその所定のし
きい値よりも大であときは温度の高い方のタイヤの表面
温度が異常上昇したと判定する異常判定手段６と、該判
定手段６による異常判定を受けて運転者等に警報を発す
る警報手段８とを備えて成る。FIG. 9 is a block diagram showing an embodiment of the third invention. The illustrated embodiment includes tire temperature sensors 2FL, 2PR, and 2R that detect the surface temperature of each of the front, rear, left, and right tires.
L, 2RR, and a temperature difference calculation means 14 that calculates the difference between the surface temperature of each tire inputted from the tire temperature sensor;
The temperature difference calculated by the calculating means 14 is compared with a predetermined threshold value set in advance, and if the temperature difference is larger than the predetermined threshold value, the surface temperature of the tire with a higher temperature is determined. The vehicle is equipped with an abnormality determining means 6 for determining that the vehicle has increased abnormally, and an alarm means 8 for issuing a warning to the driver etc. in response to the abnormality determination by the determining means 6.
上記温度差に基づくタイヤ異常判定の具体例を挙げると
次の通りである。A specific example of tire abnormality determination based on the temperature difference is as follows.
例えば、第１０図に示す様に、各センサ２ＦＬ。For example, as shown in FIG. 10, each sensor 2FL.
２ＦＲ，２ＲＬ、２ＲＲの出力（タイヤ表面の検出温度
）ＴＰＬ・ＴＦＲ・ＴＲＬ・ ＴＲＲに基づ（１て・左
右のタイヤの表面温度差、例えばＩＴＰＬ ＴＰＲお
よびＩＴＲＬ ＴＲＲＩを算出し、あるいは前後のタ
イヤの表面温度差、例えばＩＴＦＬ ＴＲＬＩおよび
ＩＴＦＲＴＲＲＩを算出し、それらの差を予め設定され
た所定のしきい値ＴＴＨと比較し、差がそのＴＴＨより
大であるときは温度の高い方のタイヤの表面温度が異常
上昇していると判定し、警報を発することができる。Based on the output (detected temperature of the tire surface) of 2FR, 2RL, and 2RR (the detected temperature of the tire surface) TPL, TFR, TRL, and TRR (1) Calculate the surface temperature difference between the left and right tires, for example, ITPL TPR and ITRL TRRI, or calculate the Calculate the surface temperature difference, for example ITFL TRLI and ITFRTRRI, and compare those differences with a preset predetermined threshold TTH, and if the difference is greater than TTH, the surface of the tire with higher temperature It can determine that the temperature has risen abnormally and issue an alarm.
また、第１１図に示す様に、各タイヤの表面温度Ｔ Ｐ
ＬＩ Ｔ ＰＲＩ Ｔ ｌｉｔ、 Ｔ ＲＲの中から最
大の表面温度Ｔ、、、を選出し、そのＴ１．つと残りの
３つの表面温度の平均ＴＡｖＥとの差Ｔｅａｍ ＴＡ
ＶＥを予め設定された所定のしきい値ＴＴＨと比較し、
上記差がＴＴ）Ｉより大のきにはその最大表面温度を示
したタイヤの表面温度が異常上昇していると判定し、警
報を発するようにしても良い。In addition, as shown in FIG. 11, the surface temperature of each tire T P
The maximum surface temperature T, , is selected from LI T PRI T lit, T RR, and its T1. Team TA
Comparing VE with a predetermined threshold value TTH,
When the difference is greater than TT)I, it may be determined that the surface temperature of the tire exhibiting the maximum surface temperature has increased abnormally, and an alarm may be issued.
また、前記第１の発明の場合と同様に、上記第１０、１
１図の場合において左右の差もしくは前後の差およびＴ
ｍａｘ ＴＡＶＥがＴＴＨより大であっても直ちにタ
イヤ異常とは判定せず、その左右の差等がＴＴＨより大
である状態が一定時間継続した場合にタイヤの表面温度
が異常上昇していると判定し、警報を発するようにして
も良い。Further, as in the case of the first invention, the tenth and the
In the case of Figure 1, the left and right difference or the front and back difference and T
Even if max TAVE is greater than TTH, it is not immediately determined that the tire is abnormal, but if the difference between the left and right sides continues to be greater than TTH for a certain period of time, it is determined that the tire surface temperature has increased abnormally. However, a warning may be issued.
前述の様にタイヤの雰囲気温度変化やタイヤ温度センサ
の雰囲気温度変化によるタイヤ温度センサ出力値の変化
は各タイヤについてほぼ同様に発生する。従って、各タ
イヤ例えば左右罰輪のタイヤについて検出温度の差を取
れば、その温度差には上記外的要因による変化分は含ま
れておらず、よって上述の様に各タイヤの温度差に基づ
いて、タイヤ異常判定を行なう、即ちその温度差が所定
のしきい値より大のときは温度の高い方のタイヤの表面
温度が異常上昇していると判定するようにすれば、上記
外的要因により影響を受けない信頼性の高い異常判定を
行なうことができる。As described above, changes in the output value of the tire temperature sensor due to changes in the ambient temperature of the tire or changes in the ambient temperature of the tire temperature sensor occur in substantially the same way for each tire. Therefore, if we take the difference in detected temperature between each tire, for example the left and right tires, the temperature difference does not include the change due to the external factors mentioned above, and therefore, as mentioned above, it is based on the temperature difference between each tire. In other words, if the temperature difference is larger than a predetermined threshold value, it is determined that the surface temperature of the higher temperature tire has increased abnormally, and the above external factors can be eliminated. It is possible to perform highly reliable abnormality judgments that are not affected by this.
第（２図は上記第２の発明における雰囲気温度Ｔ ０Ｌ
Ｉ７の一例である路面温度とタイヤ表面温度との関係を
示す図であり、図示の様に路面温度の上昇によってタイ
ヤ表面温度も上昇する。(Figure 2 shows the atmospheric temperature T 0L in the second invention above.
It is a diagram showing the relationship between road surface temperature and tire surface temperature, which is an example of I7, and as shown in the figure, as the road surface temperature increases, the tire surface temperature also increases.
上記タイヤ温度センサ２ （２ＦＬ、２ＦＲ，２ＲＬ
２ＲＲ）や雰囲気温度センサ】０としての路面温度セ
ンサ１０ａとしては、たとえば白金抵抗体を利用した放
射熱吸収型（赤外線吸収型）温度センサを好適に用いる
ことができる。The above tire temperature sensor 2 (2FL, 2FR, 2RL
2RR) or ambient temperature sensor] As the road surface temperature sensor 10a, for example, a radiant heat absorption type (infrared absorption type) temperature sensor using a platinum resistor can be suitably used.
上記タイヤ温度センサ２は例えば側面概略図である第１
３図および平面概略図である第１４図に示す様に、タイ
ヤのトレッド表面の温度を検出すべく該トレッド表面に
対向させてタイヤハウス内に配設するれば良いが、特に
タイヤトレッド表面のうちタイヤの内側面に近い部分、
例えば内側面からの距離１が５０〜６０＃の部分の温度
を検出するように配設するのが望ましい。The tire temperature sensor 2 is, for example, a first
As shown in Fig. 3 and Fig. 14, which is a schematic plan view, the temperature of the tire tread surface may be detected by disposing it in the tire house so as to face the tread surface. The part near the inner surface of the tire,
For example, it is desirable to arrange the sensor so as to detect the temperature at a distance 1 from the inner surface of 50 to 60#.
タイヤ温度センサとして上記の様な放射熱吸収型温度セ
ンサを用いた場合、該センサがタイヤ表面以外からの放
射熱による温度上昇を検出すると異常判定の信頼性が低
下する。従って、かかるタイヤ表面以外からの放射熱を
吸収した場合における異常判定の信頼性低下を抑制する
ためには、検出対象であるタイヤ表面の温度が高い方が
有利である。しかして、タイヤには一般にキャンバ角が
与えられているのでトレッド面の中で内側に近い部分の
負荷が大きく、そのため第１５図に示す様に内側に近い
部分の温度が他の部分に比して高い。When a radiant heat absorption type temperature sensor as described above is used as a tire temperature sensor, if the sensor detects a temperature increase due to radiant heat from sources other than the tire surface, the reliability of abnormality determination decreases. Therefore, in order to suppress a decrease in the reliability of abnormality determination when radiant heat is absorbed from sources other than the tire surface, it is advantageous that the temperature of the tire surface to be detected is higher. However, since tires are generally given a camber angle, the load on the inner part of the tread surface is greater, and as a result, as shown in Figure 15, the temperature of the inner part is higher than other parts. It's expensive.
よって、上述の様にタイヤトレッド表面のうち内側面に
近い部分の温度を検出するように配設することによって
、異常判定の信頼性をより高めることができる。Therefore, by arranging the sensor to detect the temperature of the portion of the tire tread surface close to the inner surface as described above, the reliability of abnormality determination can be further improved.
なお、上記第１３図および第１４図には上記路面温度セ
ンサｌＯａと同じく雰囲気温度センサの一例である外気
温センサ１０ｂの配設態様も示されている。Note that FIGS. 13 and 14 also show the arrangement of an outside temperature sensor 10b, which is an example of an ambient temperature sensor like the road surface temperature sensor lOa.
（発明の効果）
以上詳述した様に、第１の発明は検出されたタイヤ表面
温度そのものではなくその表面温度の時間に対する変化
率に基づいて、第２の発明は検出されたタイヤ表面温度
そのものを用いるが判定の基準となるしきい値を外的要
因に基づいて変化させ、第３の発明は検出されたタイヤ
表面温度そのものではなく複数のタイヤの表面温度の差
に基づいて、それぞれタイヤの異常判定を行なう様に構
成されているので、タイヤの雰囲気温度やタイヤ温度セ
ンサの雰囲気温度等の外的要因に左右されることなく正
確な信頼性の高いタイヤの異常判定を行なうことができ
る。(Effects of the Invention) As detailed above, the first invention is based on the detected tire surface temperature itself, but not on the rate of change of the surface temperature over time, and the second invention is based on the detected tire surface temperature itself. However, the threshold value serving as the criterion for determination is changed based on external factors, and the third invention is based on the difference in surface temperature of a plurality of tires, not on the detected tire surface temperature itself, to determine the temperature of each tire. Since the tire is configured to perform abnormality determination, it is possible to accurately and highly reliable determine whether the tire is abnormal or not, regardless of external factors such as the ambient temperature of the tire or the ambient temperature of the tire temperature sensor.
第１図は本願の第１の発明の一実施例を示すブロック図
、
第２図〜第５図はそれぞれ第１の発明における異常判定
の具体例を示すフローチャート、第６図は本願の第２の
発明の一実施例を示すブロック図、
第７図は第２の発明における異常判定の具体例を示すフ
ローチャート、
第８図は第２の発明における雰囲気温度としきい値との
関係の一例を示す図、
第９図は第３の発明の一実施例を示すブロック図、
第１０図、第１１図は第３の発明における異常判定の具
体例を示すフローチャート、
第１２図は第２の発明における雰囲気温度の一例である
路面温度とタイヤの表面温度との関係を示す図、
第１３図および第１４図はタイヤ温度センサおよび雰囲
気温度センサの配設態様の一例を示す側面概略図および
平面概略図、
第１５図はタイヤトレッド表面の温度分布を示す図であ
る。
２ （２ＦＬ、２ＦＲ，２ＲＬ、２ＲＲ）・・・タイヤ
温度センサ
４・・・変化率算出手段 ６・・・異常判定手段１０
・・・雰囲気温度センサ １２・・・しきい値変更手段
１４・・・温度差算出手段
第１図
第２図
第３図
第
９
図
第
図
第
図
第
２
図
で隻￥ＰFIG. 1 is a block diagram showing an embodiment of the first invention of the present application, FIGS. 2 to 5 are flowcharts each showing a specific example of abnormality determination in the first invention, and FIG. FIG. 7 is a flow chart showing a specific example of abnormality determination in the second invention; FIG. 8 is an example of the relationship between ambient temperature and threshold value in the second invention. 9 is a block diagram showing an embodiment of the third invention, FIGS. 10 and 11 are flowcharts showing a specific example of abnormality determination in the third invention, and FIG. 12 is a block diagram showing an embodiment of the third invention. A diagram showing the relationship between road surface temperature, which is an example of ambient temperature, and tire surface temperature. FIGS. 13 and 14 are a schematic side view and a schematic plan view showing an example of the arrangement of the tire temperature sensor and the ambient temperature sensor. , FIG. 15 is a diagram showing the temperature distribution on the tire tread surface. 2 (2FL, 2FR, 2RL, 2RR) Tire temperature sensor 4 Change rate calculation means 6 Abnormality determination means 10
...Ambient temperature sensor 12...Threshold value changing means 14...Temperature difference calculating means Fig. 1 Fig. 2 Fig. 3 Fig. 9 Fig. Fig. Fig. 2
Claims (3)
、該センサにより検出されたタイヤ表面温度の時間に対
する変化率を算出する変化率算出手段と、該算出手段に
より算出された変化率に基づいてタイヤ表面温度が異常
上昇したか否かの判定を行なう異常判定手段とを備えて
成ることを特徴とするタイヤ異常判定装置。(1) A tire temperature sensor that detects the tire surface temperature, a rate of change calculation means that calculates the rate of change over time of the tire surface temperature detected by the sensor, and a rate of change calculated by the calculation means. A tire abnormality determining device comprising: abnormality determining means for determining whether or not the tire surface temperature has increased abnormally.
、該センサにより検出されたタイヤ表面温度が所定のし
きい値より大のときにタイヤ表面温度の異常上昇と判定
する異常判定手段と、上記タイヤまたはタイヤ温度セン
サの雰囲気温度を検出する雰囲気温度センサと、該雰囲
気温度センサにより検出された雰囲気温度に応じて上記
しきい値を変更するしきい値変更手段とを備えて成るこ
とを特徴とするタイヤ異常判定装置。(2) a tire temperature sensor that detects the tire surface temperature; an abnormality determining means that determines that the tire surface temperature has increased abnormally when the tire surface temperature detected by the sensor is greater than a predetermined threshold; It is characterized by comprising: an atmospheric temperature sensor that detects the atmospheric temperature of a tire or a tire temperature sensor; and a threshold value changing means that changes the threshold value in accordance with the atmospheric temperature detected by the atmospheric temperature sensor. Tire abnormality determination device.
、該センサにより、検出された複数のタイヤの表面温度
を比較してその温度差を算出する温度差算出手段と、該
温度差算出手段により算出された温度差が所定のしきい
値より大のときにタイヤ表面温度の異常上昇と判定する
異常判定手段とを備えて成ることを特徴とするタイヤ異
常判定装置。(3) a tire temperature sensor that detects the surface temperature of a tire, a temperature difference calculation means that compares the surface temperatures of a plurality of tires detected by the sensor and calculates a temperature difference, and a temperature difference calculation means that A tire abnormality determining device comprising: abnormality determining means for determining an abnormal increase in tire surface temperature when the calculated temperature difference is greater than a predetermined threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6029890A JPH03262715A (en) | 1990-03-12 | 1990-03-12 | Tire abnormality judging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6029890A JPH03262715A (en) | 1990-03-12 | 1990-03-12 | Tire abnormality judging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03262715A true JPH03262715A (en) | 1991-11-22 |
Family
ID=13138125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6029890A Pending JPH03262715A (en) | 1990-03-12 | 1990-03-12 | Tire abnormality judging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03262715A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0367893A (en) * | 1989-08-04 | 1991-03-22 | Takashi Machida | Winch device in crane truck |
| JP2002264619A (en) * | 2001-03-06 | 2002-09-18 | Railway Technical Res Inst | Obstacle warning device |
| WO2004014671A1 (en) | 2002-08-12 | 2004-02-19 | Bridgestone Corporation | Method, device, and recording medium where program is recorded, for deciding residual travel life and end of life of run-flat tire that continues traveling in run-flat condition |
| US7543489B2 (en) | 2004-04-12 | 2009-06-09 | Bridgestone Corporation | Method and device for determining endstage of lifetime of run-flat tire under run-flat state |
| JP2009190733A (en) * | 2009-05-28 | 2009-08-27 | Yokohama Rubber Co Ltd:The | Monitoring system for tire surface temperature, its monitoring method, its monitoring program and its monitoring screen display method |
| US8547216B2 (en) | 2010-12-01 | 2013-10-01 | Honda Motor Co., Ltd. | Tire temperature measurement system |
| WO2014192261A1 (en) * | 2013-05-28 | 2014-12-04 | 株式会社デンソー | Wireless communication apparatus for vehicle |
| WO2020145018A1 (en) * | 2019-01-09 | 2020-07-16 | 横浜ゴム株式会社 | Tire failure prediction system and tire failure prediction method |
| WO2020246320A1 (en) * | 2019-06-03 | 2020-12-10 | 横浜ゴム株式会社 | Tire failure prediction system and tire failure prediction method |
-
1990
- 1990-03-12 JP JP6029890A patent/JPH03262715A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0367893A (en) * | 1989-08-04 | 1991-03-22 | Takashi Machida | Winch device in crane truck |
| JP2002264619A (en) * | 2001-03-06 | 2002-09-18 | Railway Technical Res Inst | Obstacle warning device |
| WO2004014671A1 (en) | 2002-08-12 | 2004-02-19 | Bridgestone Corporation | Method, device, and recording medium where program is recorded, for deciding residual travel life and end of life of run-flat tire that continues traveling in run-flat condition |
| US7543489B2 (en) | 2004-04-12 | 2009-06-09 | Bridgestone Corporation | Method and device for determining endstage of lifetime of run-flat tire under run-flat state |
| JP2009190733A (en) * | 2009-05-28 | 2009-08-27 | Yokohama Rubber Co Ltd:The | Monitoring system for tire surface temperature, its monitoring method, its monitoring program and its monitoring screen display method |
| US8547216B2 (en) | 2010-12-01 | 2013-10-01 | Honda Motor Co., Ltd. | Tire temperature measurement system |
| WO2014192261A1 (en) * | 2013-05-28 | 2014-12-04 | 株式会社デンソー | Wireless communication apparatus for vehicle |
| JP2014232949A (en) * | 2013-05-28 | 2014-12-11 | 株式会社デンソー | Vehicle radio communication apparatus |
| WO2020145018A1 (en) * | 2019-01-09 | 2020-07-16 | 横浜ゴム株式会社 | Tire failure prediction system and tire failure prediction method |
| JP2020111126A (en) * | 2019-01-09 | 2020-07-27 | 横浜ゴム株式会社 | Tire trouble prediction system and tire trouble prediction method |
| US11884112B2 (en) | 2019-01-09 | 2024-01-30 | The Yokohama Rubber Co., Ltd. | Tire failure prediction system and tire failure prediction method |
| WO2020246320A1 (en) * | 2019-06-03 | 2020-12-10 | 横浜ゴム株式会社 | Tire failure prediction system and tire failure prediction method |
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