1248882 九、發明說明 【發明所屬之技術領域】 本發明係有關於一種輪胎狀態感測裝置的定位 (Locating)方法，特別有關於一種可短時間内自動地辨識出 複數個輪胎狀態感測裝置之所在位置的定位方法。 【先前技術】 汽車輪胎胎壓不足，輕者造成行車上不方便，像是比較 耗油，汽車操控性受到影響，同時輪胎耐久性和胎紋壽命也 降低。重者造成汽車輪胎爆胎，危及乘客的生命安全。輪胎 監測系統可幫助駕駛人於車内隨時檢查車輛輪胎的狀況，例 如壓/JBL度荨，因而可有效地增加車輛的安全性。 請參照第1圖，其為繪示習知之輪胎監測系統的結構^ 意圖。其中，輪胎狀態感測裝置12、14、16和18係分別夺 裝在四個輪胎中，天線22、24、26和28係分別安裝在車^ 主體架構中靠近輪胎狀態感測装置12、14、16和18的位還 上，天線22、24、26和28並連接至位於車子主體架構中# 接收器3G(具有訊號接收電路）。運作時，輪胎狀態感測裝置 係輪流以無線的方式發射輪胎的狀況訊號，天線22、24、 26和28接收訊號後，將訊號傳送至接收器％，再透過顯示 裝置（未繪示）通知駕駛人輪胎的狀況。 畐接收器3 0收到訊號後，首先，輪 獅月口&測糸統必須辨 識Is射此訊號之輪胎狀態感測裝置的位 „ ^ ^ e Μ I万月匕告知駕駛人 此讯唬疋屬於那一個輪 一般，習 白$ 4辨識輪胎狀態感測 1248882 裝置與輪胎之相對位置的技術，係由操作人員對輪胎一一進 行放氣再充氣的動作，藉由每一個輪胎壓力的急遽下降，使 其中之輪胎狀態感測裝置持續地發射輪胎的狀況訊號，再將 此訊號解碼而獲得此輪胎狀態感測裝置的識別編號，因而建 立輪胎狀態感測裝置與輪胎位置的對應關係。因此，於運作 時，當接收器收到某一訊號時，經解碼後可得某一輪胎狀態 感測裝置的識別編號，再透過前述之輪胎狀態感測裝置與輪 胎的對應關係，便可確認發射此訊號的輪胎位置。 然而，前述之習知技術無法自動地執行，須透過人為操 作方能完成。對輪胎一一放氣再充氣的動作相當曠日廢時^ 而且每當更換新胎或變換輪胎的位置時，又得重新辨識輪胎 狀態感測裝置的位置，故習知技術相當缺乏效率且耗時費 力，無法滿足消費者的需求。 、 因此，非常迫切需要發展一種輪胎狀態感測裝置的定位 方法，藉以自動地辨識輪胎狀態感測裝置的位置，和大幅地 縮短辨識時間，因而有效地節省人力物力，滿足消費者的需 求0 【發明内容】 本發明的目的就是在提供一種輪胎狀態感測裝置的定 位方法，藉以自動地辨識輪胎狀態感測裝置的位置， = 使用人力。 須 、—本發明之又一目的就是在提供一種輪胎狀態感測裝置 的疋位方法，藉以大幅地縮短辨識輪胎狀態感测裝置的時 1248882 間0 根據本發明之上述目的，提出一種輪胎狀態感測裝置的 疋位方法，藉以辨識安裝在一運輸工具之複數個輪胎狀態感 測襞置的位置。 依照本發明之較佳實施例，本發明之輪胎狀態感測裝置 的定位方法至少包括下列步驟：提供複數個天線，其中此些 天線係分別安裝在靠近輪胎狀態感測裝置的位置；進入定位 拉式；將天線全部啟動；接收並解碼一訊號，其中此訊號至 少包括有一識別編號，而此識別編號係屬於此些輪胎狀態感 測裝置之一第一輪胎狀態感測裝置，故此訊號係由第一輪胎 狀態感測裝置所發射；判斷訊號是否於一段時間中持續被發 射’並產生第一判斷結果；當第一判斷結果為是，則取得天 線共同接收此訊號後所產生的一信號強度；判斷識別編號是 否屬於此運輸工具，並產生第二判斷結果；以及當第二判斷 結果為是，則進行辨識訊號位置的步驟。辨識訊號位置的步 驟至少包括下列步驟·輪流快速地開關天線，天線接收此訊 號後產生複數個信號強度變化值，其中每一個天線的啟動狀 態或關閉狀態均持續地維持於一段時間中；比較此些信號強 度變化值，而得一最大值；決定正在發射訊號之第一輪胎狀 態感測裝置的位置，其中該最大值係於開關天線中之第一天 線時所產生，故第一輪胎狀態感測裝置係對應於第一天線。 因此，應用本發明，可自動地辨識輪胎狀態感測裝置的 位置，而無須使用人力；大幅地縮短辨識輪胎狀態感測裝置 的時間，而有效地節省人力物力，並滿足消費者的需求。 1248882 【實施方式】 本發明的特徵係在於當確定 發射訊號時，輪流快速地開關天線，並取得複數個信號強度 變化值，其中產生此些信號強度變化值中之最大值之天線的 所在位置，即為正在發射訊號之輪胎狀態感測裝置所對應的 位置。 本發明可應用於如第1圖所示之輪胎監測系統，以下僅 使用第1圖來方便說明本發明之輪胎狀態感測裝置的定位 方法，然而，本發明並不在此限。本發明可應用於具有任意 數目之輪胎（包括備胎）的任何運輸工具（如汽車、機車等）。 4參照第1圖和第2圖，第2圖為繪示本發明實施例之 輪胎狀態感測裝置的定位方法的訊號示意圖，其中輪胎狀態 感測裝置12、14、16 #口 18輪流每隔第一段時間(例如：i 分鐘）持續地發射訊號經第二段時間（例如：1〇ms)之久。如 第2圖所不’在時間點⑺時’首先，發現輪胎狀態感測裝 置正在發射訊號。然後，輪胎監測系統進入一定位模式。於 時間點to至時間點tl之間(該段期間於下文簡稱為第三段 :間)’天線22、24、26和28接收到關於某一輪胎之狀況 H將此訊號傳到接收器3M灸，將此訊號解碼。由於 包括有輪胎狀態感測裝置的識別編號，故由此識別編 h 口此訊號係自例如輪胎狀態感測裝置14戶斤發射。缺 而，由於此時系統不知道輪胎狀態感 ‘,、、 個輪胎，故奉矫盔半俨A LL〜上/ 你位於那一 糸、洗，，，、/去侍知此訊號係關於那-個輪胎的狀況。 1248882 接著，系統會判斷此訊號是否於時間點t〇至時間點^ 之間持續被發射，即訊號是否於此段時間中持續被接收写 3〇所收到，若判斷結果為是，則取得天線22、24、26和28 共同接收此訊號後由接收器30所產生之第一信號強度（如 t〇至tl間之訊號曲線70的信號強度平均值）。然後，判斷 前述之識別編號是否屬於系統（即是否由系統所在之運輪工 具中的輪胎狀態感測裝置所發射出來）。若識別編號是屬於 系統，則進行辨識訊號位置的步驟。於時間點tl時，將天 線22、24、26和28全部關閉，再輪流快速地先開後關每一 個天線，並使每一個天線的啟動狀態均持續地維持一段時間 (例如：0.44ms)。例如：將天線22、24、26和28全部關閉 後’於時間點tl開啟天線22，再於時間點t2關閉天線22 並開啟天線24;再於時間點t3關閉天線24並開啟天線26 ; 再於時間點t4關閉天線26並開啟天線28 ;然後，於時間 點15全部開啟天線2 2、2 4、2 6和2 8 ，其中時間點11、12 t3、t4和t5的間隔為例如：〇.44ms(此段期間於下文簡稱為 第四段時間）。當快速地輪流開關天線22、24、26和28時， 訊號曲線70的第一信號強度會隨之變化為訊號曲線72、 74、76和78的複數個第二信號強度，比較第一信號強度和 第二信號強度後，可獲得的複數個信號強度變化值（差值）。 接著，比較此些信號強度變化值，而得一最大值，即訊 號曲線74，而訊號曲線74係於開關天線24時所產生，即 代表天線24最靠近正在發射訊號的輪胎狀態感測裝置。由 於此輪胎狀態感測裝置必定具有前述之識別編號，而此識別 1248882 編號係屬於輪胎狀態感測裝置14，故系統可辨識出輪胎狀 態感測裝置14的位置係對應於天線24,即輪胎狀態感測裝 置14係偵測天線24所對應的輪胎。 然後，於時間點t5之後，系統會分別接收到輪胎狀態 感測裝置12、16和18所發射的訊號，重覆上述步驟後，系 統便可分別辨識出所有輪胎狀態感測裝置12、16和18的位 值得一提的是，輪胎狀態感測裝置係每隔例如丨分鐘持 續地發射訊號例如1 〇ms，因此，本發明之辨識一個輪胎狀 態感測裝置的操作時間（如時間點t0至t5)必須於1〇ms中完 成。因而，本發明所使用之訊號接收電路必須能於例如1〇_ 内反應出天線影響信號強度的變化值。又，其中本發明所使 用之天線可為同一規格型式的天線。 另外，本發明實施例之辨識訊號位置的步驟亦可於時間 點tl時，維持天線22、24、26和28於啟動狀態，再輪流 快速地先關後開每一個天線，並使每一個天線的關閉狀態均 持縯地維持一段時間（例如：〇 44nis)。例如：於時間點u 關閉天線22 ’再於時間點t2開啟天線22並關閉天線24 ; 再於時間點t3開啟天線24並關閉天線26 ;再於時間點t4 開啟天線26並關閉天線28 ;然後，於時間點t5全部開啟 天線28 。當快速地輪流關開天線22、24、％和28時，訊 號曲線70的信號強度會隨之減弱，而分別產生第二信號強 度強度，並獲得第一信號強度與第二信號強度間的複數個信 7虎強度變化值（差值）。接著，比較此些信號強度變化值，以 10 1248882 找出何者變化最大（減少最多），便可得知產生最大變化值的 天線所對應的輪胎’即是正在發射訊號之輪胎狀態感測裝置 的所在位置。 請參照第3A圖和第3B^，其為分麟示本發明實施 例之輪胎狀態感測裝置的定位方法和辨識訊號位置步驟的 =程示意圖。如第3A圖所示，首先，進行步驟ι〇〇以提供 複數個天線，其巾此些天線係以分別安裝在靠近複數個輪胎 狀態感測裝置的位置，輪胎狀態感測裝置係安裝在一運輸工 具中。在輪胎監測系統進入定位模式（步驟11〇)後，將天線 全部啟動（步驟120)。接著，進行步驟13〇以接收並解碼一 Λ號其中此成號至少包括有-識別編號，而此識別編號係 屬於輪胎狀態感測裝置中之第一輪胎狀態感測裝置，故此訊 號係由第一輪胎狀態感測裝置所發射。然後，進行步驟14〇 以判斷是否#續發射訊號，即此訊號是否於一段時間中持續 被I射右步驟14〇的結果為是，則取得天線共同接收訊號 (/妾收器所獲得的訊號）後所產生的信號強度（步驟15〇)。進 行ν驟160以判斷訊號之識別編號是否屬於此運輸工具。若 步驟1 6〇的結果為是，則進行辨識訊號位置的步驟1 70。若 步驟140或步驟16〇的結果為否，則回到步驟13〇以繼續接 收並解碼一訊號。 如第3Β圖所示’於辨識訊號位置的步驟17〇中，首先， 輪流快速地開關每一個天線（步驟172)，接收器接收此訊號 後產生複數個信號強度變化值，其中每一個天線的啟動狀態 或關閉狀態均持續地維持於一段時間中。如上所述，在辨識 11 1248882 訊號位置的步驟〗7 _ 义 产Ή _止 仃之刖，可先將天線全部關閉，再輪 抓决速地先開後關每一個 均持續地維持於一…一個天線的啟動狀態 推^ _、又守間中，或者，在辨識訊號位置的步驟 則，仍舊保持全部天線於啟動狀態， 關後開每一個关始甘山— 丹輪抓决速地先 达认 天線，其中母一個天線的關閉狀態均持續地維 持於一段時間中。 接著，進行步冑m以比較此些信號強度變化值，而得 =大值。然後，進行步驟176以決定正在發射訊號之第一 ::狀態_'置的位置，其中此最大值係於開關 天線日守所產生，故第一輪胎狀態感測裝置係對應於第一 ?良，即第-輪胎狀態感測裝置係_ 一天線所對應的輪 月口…、後’重覆上述步驟以一一分別辨識出所有輪胎狀態感 測裝置的位置。 由上述本發明較佳實施例可知，應用本發明的優點 可自動地辨識輪胎狀態感測裝置的位置，大幅地縮短辨識時 間，因而有效地節省人力物力，並滿足消費者的需求。 雖然本备明已以一較佳實施例揭露如上，然其並非用以 限疋本發明，任何熟習此技藝者，在不脫離本發明之精神和 範圍内，當可作各種之更動與潤飾，因此本發明之保護範圍 當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 第1圖為繪示習知之輪胎監測系統的結構示意圖。 第2圖為繪示本發明實施例之輪胎狀態感測裝置的定 12 !248882 位方法的訊號示意圖。 第3 A圖為繪示本發明實施例之輪胎狀態感測裝置的定 位方法的流程示意圖。 第3 B圖為繪示本發明實施例之辨識訊號位置步驟的流 程示意圖。 【主要元件符號說明】 12、14、16 ' 18 :輪胎狀態感測裝置 22、24、26、28 :天線 3〇 :接收器 70、72、74、76、78 :訊號曲線 100 :提供複數個天線 110 :進入定位模式 120 :將天線全部啟動 13 0 :接收並解碼訊號 140:判斷訊號是否持續發射 150 :取得信號強度 160 :判斷識別編號是否屬於此運輸工具 17 0 :進行辨識訊號位置的步驟 172 :輪流快速地開關天線 174 :比較信號強度變化值 17 6 ·決定正在發射訊號之輪胎狀態感測裝置的位置 t0、tl、t2、t3、t4、t5 :時間點 131248882 IX. Description of the Invention [Technical Field] The present invention relates to a positioning method of a tire state sensing device, and more particularly to a method for automatically recognizing a plurality of tire state sensing devices in a short time. The location method of the location. [Prior Art] Insufficient tire pressure in automobile tires, which is inconvenient for driving, such as fuel consumption, car handling is affected, and tire durability and tread life are also reduced. The heavy ones cause tires in car tires, endangering the safety of passengers. The tire monitoring system helps the driver to check the condition of the vehicle tires at any time in the vehicle, such as the pressure/JBL degree, thus effectively increasing the safety of the vehicle. Please refer to FIG. 1 , which is a schematic diagram showing the structure of a conventional tire monitoring system. Wherein, the tire state sensing devices 12, 14, 16, and 18 are respectively captured in four tires, and the antennas 22, 24, 26, and 28 are respectively mounted in the vehicle body structure near the tire state sensing devices 12, 14 The bits 16 and 18 are also connected, and the antennas 22, 24, 26 and 28 are connected to the receiver 3G (with signal receiving circuit) located in the vehicle body structure. In operation, the tire state sensing device wirelessly transmits the condition signal of the tire, and after receiving the signal, the antennas 22, 24, 26 and 28 transmit the signal to the receiver %, and then transmit the notification through the display device (not shown). The condition of the driver's tires.畐 After the receiver 30 receives the signal, first of all, the wheel lion mouth & amp system must identify the position of the tire state sensing device that emits this signal „ ^ ^ e Μ I Wan Yue 匕 inform the driver of this message 唬疋 belongs to that one round, Xi Bai $ 4 identifies the tire state sensing 124882 The relative position of the device and the tire is the action of the operator to deflate and re-inflate the tire one by one, with the impatience of each tire pressure Decreasing, wherein the tire state sensing device continuously emits a condition signal of the tire, and then decoding the signal to obtain an identification number of the tire state sensing device, thereby establishing a correspondence relationship between the tire state sensing device and the tire position. During operation, when the receiver receives a certain signal, it can obtain the identification number of a tire state sensing device after decoding, and then confirm the transmission through the corresponding relationship between the tire state sensing device and the tire. The position of the tire of this signal. However, the above-mentioned prior art cannot be automatically performed and must be completed by human operation. The tire is deflated and re-inflated. When the time of the new tire or the change of the tire is changed, the position of the tire state sensing device has to be re-recognized, so the conventional technology is rather inefficient and time consuming, and cannot meet the needs of the consumer. Therefore, it is very urgent to develop a positioning method of a tire state sensing device, thereby automatically recognizing the position of the tire state sensing device and greatly shortening the identification time, thereby effectively saving manpower and material resources and satisfying the needs of consumers. SUMMARY OF THE INVENTION An object of the present invention is to provide a positioning method of a tire state sensing device, thereby automatically recognizing the position of the tire state sensing device, = using manpower. - A further object of the present invention is to provide a tire The clamping method of the state sensing device is used to greatly shorten the time of identifying the tire state sensing device. According to the above object of the present invention, a clamping method of the tire state sensing device is proposed, thereby identifying the installation in a transportation tool. The position of the plurality of tire state sensing devices. In an embodiment, the positioning method of the tire state sensing device of the present invention at least includes the steps of: providing a plurality of antennas, wherein the antennas are respectively mounted at positions close to the tire state sensing device; entering the positioning pull type; Receiving and decoding a signal, wherein the signal includes at least one identification number, and the identification number belongs to one of the tire state sensing devices of the tire state sensing device, so the signal is determined by the first tire state sensing device Transmitting; determining whether the signal is continuously transmitted for a period of time and generating a first determination result; when the first determination result is yes, obtaining a signal strength generated after the antenna collectively receives the signal; determining whether the identification number belongs to Transporting the tool and generating a second determination result; and when the second determination result is yes, performing the step of identifying the signal position. The step of identifying the signal position includes at least the following steps: rotating the antenna rapidly in turn, and the antenna receives the signal to generate a complex number Signal strength change value, in which each antenna is activated Or the off state is continuously maintained for a period of time; comparing the signal strength change values to obtain a maximum value; determining the position of the first tire state sensing device that is transmitting the signal, wherein the maximum value is in the switching antenna When the first antenna is generated, the first tire state sensing device corresponds to the first antenna. Therefore, by applying the present invention, the position of the tire state sensing device can be automatically recognized without using labor; the time for recognizing the tire state sensing device is greatly shortened, and manpower and material resources are effectively saved, and the demand of the consumer is satisfied. 1248882 [Embodiment] The present invention is characterized in that when determining a transmission signal, the antenna is rapidly switched in turn, and a plurality of signal strength change values are obtained, wherein the position of the antenna that generates the maximum of the signal strength change values is obtained. That is, the position corresponding to the tire state sensing device that is transmitting the signal. The present invention can be applied to a tire monitoring system as shown in Fig. 1. Hereinafter, only the first figure will be used to conveniently explain the positioning method of the tire state sensing device of the present invention, however, the present invention is not limited thereto. The invention is applicable to any vehicle (e.g., automobile, locomotive, etc.) having any number of tires, including spare tires. 4, FIG. 1 and FIG. 2, FIG. 2 is a schematic diagram showing the signal positioning method of the tire state sensing device according to the embodiment of the present invention, wherein the tire state sensing devices 12, 14, 16 are alternately rotated. The first period of time (eg, i minutes) continuously transmits the signal for a second period of time (eg, 1 〇 ms). As shown in Fig. 2, at the time point (7), first, it was found that the tire state sensing device was transmitting a signal. The tire monitoring system then enters a positioning mode. Between the time point and the time point t1 (this period is hereinafter referred to as the third paragraph: between) the antennas 22, 24, 26 and 28 receive the condition H about a certain tire and transmit the signal to the receiver 3M. Moxibustion, decode this signal. Since the identification number of the tire state sensing device is included, the signal is thus recognized from the tire state sensing device 14 for example. Lack, because the system does not know the sense of tire status,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, The condition of the tires. 1248882 Next, the system will determine whether the signal is continuously transmitted between the time point t〇 and the time point ^, that is, whether the signal is continuously received and received by the user during the time period, and if the judgment result is yes, the system obtains The first signal strength (eg, the average signal strength of the signal curve 70 between t〇 and t1) generated by the receiver 30 after the antennas 22, 24, 26, and 28 collectively receive the signal. Then, it is judged whether or not the aforementioned identification number belongs to the system (i.e., whether it is emitted by the tire state sensing device in the wheel tool in which the system is located). If the identification number belongs to the system, the step of identifying the signal position is performed. At time t1, the antennas 22, 24, 26 and 28 are all turned off, and then each antenna is turned on and off first in turn, and the starting state of each antenna is continuously maintained for a period of time (for example: 0.44 ms). . For example, after the antennas 22, 24, 26, and 28 are all turned off, the antenna 22 is turned on at the time point t1, the antenna 22 is turned off and the antenna 24 is turned on at the time point t2, and the antenna 24 is turned off and the antenna 26 is turned on at the time point t3; The antenna 26 is turned off and the antenna 28 is turned on at the time point t4; then, the antennas 2 2, 2 4, 2 6 and 2 8 are all turned on at the time point 15, wherein the intervals of the time points 11, 12 t3, t4 and t5 are, for example: 〇 .44ms (this period is referred to below as the fourth period of time). When the switch antennas 22, 24, 26, and 28 are rapidly turned, the first signal strength of the signal curve 70 changes to a plurality of second signal strengths of the signal curves 72, 74, 76, and 78, and the first signal strength is compared. And a plurality of signal strength change values (differences) obtained after the second signal strength. Then, the signal strength change values are compared to obtain a maximum value, i.e., the signal curve 74, and the signal curve 74 is generated when the antenna 24 is switched, i.e., the antenna 24 is closest to the tire state sensing device that is transmitting the signal. Since the tire state sensing device must have the aforementioned identification number, and the identification 1248882 number belongs to the tire state sensing device 14, the system can recognize that the position of the tire state sensing device 14 corresponds to the antenna 24, that is, the tire state. The sensing device 14 detects the tire corresponding to the antenna 24. Then, after time t5, the system will receive the signals transmitted by the tire state sensing devices 12, 16 and 18 respectively. After repeating the above steps, the system can identify all the tire state sensing devices 12, 16 and It is worth mentioning that the tire state sensing device continuously transmits a signal such as 1 〇ms every, for example, 丨 minute. Therefore, the present invention recognizes the operation time of a tire state sensing device (e.g., at time t0 to T5) must be completed in 1〇ms. Therefore, the signal receiving circuit used in the present invention must be able to reflect, for example, a change in the signal strength of the antenna in the range of 1 〇 _. Further, the antenna used in the present invention may be an antenna of the same specification type. In addition, the step of recognizing the signal position in the embodiment of the present invention may also maintain the antennas 22, 24, 26, and 28 in the activated state at the time point t1, and then turn off each antenna quickly and then turn off each antenna, and make each antenna The off state is maintained for a period of time (for example: 〇 44nis). For example: turn off the antenna 22' at the time point u and turn on the antenna 22 and turn off the antenna 24 at the time point t2; turn on the antenna 24 and turn off the antenna 26 at the time point t3; turn on the antenna 26 and turn off the antenna 28 at the time point t4; At the time point t5, the antenna 28 is fully turned on. When the antennas 22, 24, %, and 28 are turned off rapidly, the signal strength of the signal curve 70 is weakened, and the second signal intensity is respectively generated, and a complex number between the first signal strength and the second signal strength is obtained. The letter 7 tiger intensity change value (difference). Then, compare the signal strength change values, find out which one has the largest change (the most decrease) at 10 1248882, and know that the tire corresponding to the antenna that produces the maximum change value is the tire state sensing device that is transmitting the signal. location. Please refer to FIG. 3A and FIG. 3B, which are schematic diagrams showing the positioning method of the tire state sensing device and the step of identifying the signal position in the embodiment of the present invention. As shown in FIG. 3A, first, a step ι is performed to provide a plurality of antennas, such that the antennas are respectively mounted at positions close to the plurality of tire state sensing devices, and the tire state sensing device is mounted on the tire state sensing device. In the transportation vehicle. After the tire monitoring system enters the positioning mode (step 11A), the antennas are all activated (step 120). Then, step 13 is performed to receive and decode an nickname, wherein the number includes at least an identification number, and the identification number belongs to the first tire state sensing device in the tire state sensing device, so the signal is A tire state sensing device emits. Then, step 14 is performed to determine whether or not to continue transmitting the signal, that is, whether the signal continues to be detected by the right step 14〇 for a period of time, and then the antenna obtains the signal (the signal obtained by the receiver) is obtained. The signal strength produced after (step 15〇). A ν step 160 is performed to determine if the identification number of the signal belongs to the vehicle. If the result of step 16 为 is YES, then step 1 70 of identifying the signal position is performed. If the result of step 140 or step 16 is negative, then return to step 13 to continue receiving and decoding a signal. As shown in Fig. 3, in step 17 of identifying the signal position, first, each antenna is rapidly switched in turn (step 172), and the receiver receives the signal to generate a plurality of signal strength change values, wherein each antenna The startup state or the shutdown state is continuously maintained for a period of time. As mentioned above, in the step of identifying the position of the 11 1248882 signal, the step 7 _ 义 Ή _ 仃 刖 刖 刖 刖 刖 刖 刖 刖 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线 天线The start state of an antenna is pushed to _, and the keeper is in the middle, or, in the step of recognizing the position of the signal, all the antennas are still in the activated state, and each of the off-goers is turned off. Ganshan - Dan Wheel grasps the speed first The antenna is recognized, wherein the off state of one of the mother antennas is continuously maintained for a period of time. Next, step m is performed to compare the signal strength change values to obtain a large value. Then, step 176 is performed to determine the position of the first::state_' of the transmitting signal, wherein the maximum value is generated by the switching antenna, so the first tire state sensing device corresponds to the first That is, the first-tire state sensing device _ an antenna corresponding to the lunar port ..., then 'repeated the above steps to identify the position of all the tire state sensing devices one by one. As is apparent from the above-described preferred embodiments of the present invention, the advantages of the present invention can be used to automatically recognize the position of the tire state sensing device, greatly shorten the identification time, thereby effectively saving manpower and material resources, and satisfying the needs of consumers. While the present invention has been described above in terms of a preferred embodiment, it is not intended to limit the invention, and various modifications and changes may be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of a conventional tire monitoring system. FIG. 2 is a schematic diagram showing the signal of the 12!248882 bit method of the tire state sensing device according to the embodiment of the present invention. Fig. 3A is a flow chart showing the positioning method of the tire state sensing device according to the embodiment of the present invention. Figure 3B is a flow chart showing the steps of identifying the signal position in the embodiment of the present invention. [Description of main component symbols] 12, 14, 16 ' 18 : Tire state sensing devices 22, 24, 26, 28: Antenna 3: Receiver 70, 72, 74, 76, 78: Signal curve 100: Provide a plurality of Antenna 110: Enter positioning mode 120: Start all antennas 13 0: Receive and decode signal 140: Determine whether the signal continues to transmit 150: Obtain signal strength 160: Determine whether the identification number belongs to this vehicle 17 0: Step of identifying the signal position 172: Turning the antenna 174 in turn quickly: Comparing the signal strength change value 17 6 · Determining the position of the tire state sensing device that is transmitting the signal t0, tl, t2, t3, t4, t5: time point 13