201115113 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種可攜式導航設 備及其方法，並且特別是關於一種具有加 油提示功能之可攜式導航設備及其方法。 【先前技術】 _ 可攜式導航設備現今已隨科技新進 而日益普及，並且尤其是可攜式導航設備 藉由併合PDA、行動電話或 MP3播放器 等等的各式特性而進一步含有導航、備忘 錄、通訊及娛樂的組合。然而以導航而 言，使用者著實最關切油料問題，亦即油 料含量是否能以完成導航路徑。目前，車 載電腦多經配備有油料提示系統，然而， $ 可攜式導航設備卻普遍缺乏加油提示功 能。由於可攜式導航設備以被廣泛地使 用，因此若能在可攜式導航設備中配署有 加油提示功能實極為有利。不過，可攜式 導航設備確實異於車載電腦而無法監視 駕駛狀態和油料含量，因此在現有市場上 4 201115113 可攜式導航設備尚未配備有此一加油提 示功能。 現參照第1圖，此係根據習知技藝之 可攜式導航設備的方塊圖。即如圖示，可 攜式導航設備10透過一 GPS衛星11以取 得一衛星定位資料，並且GPS接收器12 將衛星定位資料傳送至處理單元1 3。在處 理單元13獲悉可攜式導航設備10的目前 位置之後，接著即自電子地圖資料庫 14 擷取所需之電子地圖，藉此取得可攜式導 航設備 1 〇與目的地之間的地理關係。可 攜式導航設備10進一步含有一顯示單元 15、一音訊輸出單元 16以及一輸入單元 1 7，被視為與一使用者相溝通的操作介 面，而使用者可藉此以輸入所規劃之目的 地。最後，處理單元 13透過一路徑導航 單元131進行數學運算以向使用者提供一 導航路徑。路徑導航單元131可為藉由載 入並執行經嵌入於記憶單元 1 8之内的路 徑導航電腦程式碼所實作。前述工作流程 為現有市場上之各式可搞式導航設備的 原始模型。故而所需者係仰賴工程投入以 致力於將此加油提示功能整合至可攜式 5 201115113 導航設備之内。 根據前述問題，本案發明人在此即已 進行廣泛研究與實驗而累積出成功的開 發與設計結果；故而提出一種具有加油提 示功能之可攜式導航設備以作為改善所 述問題的基礎和實現方式。 【發明内容】 本發明之一目的在於提供一種具有 加油提示功能的可攜式導航設備及其方 法，藉以將加油提示功能整合於可攜式導 航設備之内。 根據本發明之目的，茲提供一種具有 加油提示功能的可攜式導航設備。其包括 一顯示單元、一音訊輸出單元、一輸入單 元、一處理單元、一電子地圖資料庫、一 記憶單元，以及用以自一 GP S衛星接收衛 星定位資料的一 GPS接收器，其中處理單 元包含用以產生一導航路徑的一路徑導 航單元。本發明之可攜式導航設備的特徵 在於記憶單元含有一駕駛習慣表及一油 6 201115113 料消耗參考資料庫，並且處理單元更含有 一油料記錄單元及一加油提示單元。路徑 導航單元、油料記錄單元及加油提示單元 可分別地藉由載入並執行般入於記憶單 元之内的路徑導航、油料記錄及加油提示 電腦程式碼所實作。駕駛習慣表可按照一 使用者的駕駛習慣以記錄複數個道路等 級與複數個相對應的平均車速，同時油料 消耗參考資料庫裡儲存有車速與油料消 耗速率之間的關係。油料記錄單元記錄有 油料量值。加油提示單元能夠依據導航路 徑、駕駛習慣表和油料消耗參考資料庫而 在當一目前位置趨近於導航路徑之附近 加油站時，或是在當產生一新的導航路徑 或一經重新規劃的路徑時，自動地計算出 對於自目前位置行旅至靠近導航路徑之 次* 加油站所需要的預測油料消耗’並且 能夠在當預測油料消耗大於油料量值時 提示一警告信號。 根據本發明之目的，茲提供一種用以 在一可攜式導航設備上執行一加油提示 功能的方法，包含下列步騾：建立一駕駛 習慣表以按照一使用者的駕駛習慣來記 201115113 錄複數個道路等級與複數個相對應的平 均車速；提供一油料消耗參考資料庫以儲 存車速與油料消耗速率之間的關係；提供 一油料記錄表以記錄油料量值；利用路徑 導航單元以產生一導航路徑；以及利用加 油提示單元以依據導航路徑、駕駛習慣表 和油料消耗參考資料庫而在當車韩趨近 於導航路徑之附近加油站時，或是在當產 生一新的導航路徑或一經重新規劃的路 徑時，自動地計算出對於從一目前位置行 旅至靠近導航路徑之次一加油站所需要 的預測油料消耗，並且在當預測油料消耗 大於油料量值時提示一警告信號。 在此，自動地計算出預測油料消耗的 步驟進一步包含下列步驟：將自目前位置 至次一加油站的導航路徑劃分成複數個 道路區段；決定各道路區段的道路等級； 取得道路等級的平均車速以決定各道路 區段的相對應油料消耗速率；藉由將各個 油料消耗速率乘上各道路區段之各個距 離以計鼻出各道路區段的各個區段性油 料消耗；以及將所有的區段性油料消耗加 總以產生預測油料消耗。 8 201115113 即如前述，藉由根據本發明之具有加 油提示功能的可攜式導航設備可提供一 個或多個的下列優點： (1) 本發明可讓使用者能夠獲知目 前油料量值是否足供行旅至靠近導航路 徑或目的地之次一加油站；若否，則可產 生加油提示信號以警示使用者需先行加 油，藉此避免於路途中耗盡油料。 (2) 本發明能夠預先以道路之各式 等級做為參考，藉以改善油料消耗速率估 算。 (3) 油料消耗可為根據使用者的駕 駛習慣所算得。 【實施方式】 現參照第2圖，其係為根據本發明具 有一加油提示功能之可攜式導航設備的 方塊圖，如圖所示，具有一加油提示功能 的可攜式導航設備100可含有一 GPS接收 器12以供接收來自一 GPS衛星11的衛星 定位資料、一處理單元1 3、一電子地圖資 201115113 料庫14、一顯示單元15、一音訊輸出單 元16、一輸入單元17和一記憶單元18。 值得注意的是，處理單元13可包含一路 徑導航單元1 3 1、一油料記錄單元1 3 2及 一加油提示單元 1 3 3，並且記憶單元 18 可包含一駕駛習慣表1 8 1及一油料消耗參 考資料庫 1 8 2。路徑導航單元 1 3 1、油料 記錄單元1 3 2及加油提示單元1 3 3可為分 別地藉由載入並執行經嵌入於記憶單元 1 8之内的路徑導航、油料記錄及加油提示 電腦程式碼所實作。 在此，路徑導航單元1 3 1係經規劃以 產生一導航路徑。駕駛習慣表1 8 1可按照 一使用者的駕駛習慣以記錄複數個道路 等級及複數個相對應平均車速。駕駛習慣 表 181更佳為在使用者之曰常駕駛過程 中，藉由接收自GPS接收器12的衛星定 位資料進行統計分析所決定，或者是藉由 透過輸入單元 17的人工輸入所提供，如 此以獲得針對使用者而對應於各複數個 道路等級的平均車速。記憶單元 1 8更可 含有一個以上的駕駛習慣表1 8 1以供記錄 不同使用者的駕駛習慣。 201115113 油料消耗參考資料庫1 8 2可用以儲存 車速與油料消耗速率之間的關係。油料消 耗參考資料庫182更佳可為經由一車載電 腦，或是藉由透過輸入單元 17的人工輸 入所提供。換言之，使用者可按人工方式 來設定油料消耗參考資料庫1 8 2。例如， 使用者可從一製造商取得其車輛的油料 消耗資料。一般說來，車輛製造商可提供 車輛按不同速度的油料消耗速率。然而， 車輛的油料消耗資料大致係依據使用者 的駕駛習慣，以及交通阻塞或交通號誌的 道路條件而定，因此亦能藉由根據本發明 在平常駕駛過程中記錄油料消耗資料，來 建立油料消耗參考資料庫1 8 2。此外，若 可攜式導航設備 1 〇 0係經連接至車載電 腦，則可自車載電腦取得油料消耗參考資 料庫 1 8 2。記錄油料消耗資料的技術為眾 所週知，故而在此不予贅述。 同時，油料記錄單元1 3 2可對油料參 數值加以記錄。最好，油料記錄單元 1 3 2 係經由一車載電腦或是藉由接受透過輸 入單元的人工輸入所提供。此外，油料記 錄單元132更可提供一操作介面，讓使用 201115113 者能夠在當車輛進入一加油站時輸入油 料量值。操作介面可包含各式選項按鍵及 圖像，像是油箱加滿、加入多少油料、所 加油料的價格，藉以讓使用者能夠輸入此 次加油的油料參數值。例如，油料記錄單 元1 3 2可包含一加油按鍵以提供多次加油 之間的行旅距離，藉此計算出平均油料消 耗速率。每次加滿車輛的空油箱後，駕驶 即可按下加油按鍵以獲取車輛於目前加 油與可攜式導航設備所記錄之前次加油 間的總行旅距離，並且可利用行旅距離和 油料箱的含量分別地作為分母與分子以 計算出平均油料消耗速率。此項資訊亦可 用以作為油料消耗參考資料庫 1 8 2 的來 源。 此外，加油提示單元133可在當一車 輛趨近導航路徑之附近加油站時，即使用 者可設定一預定距離值，當兩者距離小於 此值時，便判定為趨近，或是在當產生一 新的路控或' —重新規劃的路徑時’根據導 航路徑、駕駛習慣表及油料消耗參考資料 庫自動地計算出對於自目前位置行旅至 靠近導航路徑之次一加油站所需要的預 12 201115113 測油料消耗，即使用者可設定一預定距離 值，當兩者距離小於此值時，便判定為靠 近，並且在當預測油料消耗大於油料量值 時提示一警告信號。因此，當車輛的油料 量值低於預測油料消耗時，亦即無法依照 剩餘油料完成導航路徑，具有本發明之加 油提示功能的可攜式導航設備1 0 0將通知 使用者需立即加油，例如分別地透過顯示 單元15或音訊輸出單元16而按一警告音 響或閃光的形式，藉以避免車輛於路途上 故障。 同時，具有加油提示功能的可攜式導 航設備100可進一步含有一加油按鍵。加 油按鍵可為按一圖像或一機鑰的形式所 表現。當使用者按下加油按鍵時，路徑導 航單元131可搜尋位於使用者附近的一鄰 近加油站，並且提供將使用者導引至鄰近 加油站的一導航路徑。此外，當彳貞測到可 攜式導航設備100的目前車輛位置位於一 加油站時，接著可提示一操作介面並予顯 示於顯示單元 15上，以供使用者輸入目 前的加油量值。 現參照第3圖，其中說明根據本發明 13 201115113 之第一實施例而具有加油提示功能之可 攜式導航設備的略圖。即如圖不 > 當產生 一新的路徑或一重新規劃的路徑時，例如 一使用者剛啟動可攜式導航設備或是改 變一路徑或目的地，則一加油提示單元 133可首先分析一自一目前位置192至一 次一加油站1 9 3之導航路徑 1 9 1 a並將其 劃分成複數個道路區段，同時決定各個道 路區段的等級，像是設有各種車速限制的 快速道路、高速公路、收費道路、平面道 路、高架道路、市區道路或鄉區道路，藉 此取得道路等級的平均車速，再根據一駕 駛習慣表1 8 1 a和油料消耗參考資料庫1 8 2 來決定道路區段的相對應油料消耗速 率，其單位可為例如每單位距離的油料容 積。然後，可藉由將各個油料消耗速率乘 上各道路區段的距離以計算出各個道路 區段的區段性油料消耗，並且加總區段性 油料消耗來產生預測油料消耗 1 3 4。在 此，處理單元1 3及記憶單元1 8内之各項 元件的功能和性質係類推於第2圖，故為 簡化之目的而省略其說明。 換言之，若可攜式導航設備需重新計 14 201115113 算一新的導航路徑.，例如使用者更改目的 地或在錯誤的十字路口處轉彎，則在計算 出新的導航路徑之後，加油提示單元133 將搜尋靠近新導航路徑的次一加油站並 且再度進行前述的油料檢查詢程序。例 如，即如第3圖所示，一新的導航路徑產 生後，並且一 ABC道路及一公路#2係經 納入於自目前位置192至次一加油站193 的導航路徑 191a之内，同時對一使用者 而言，根據駕駛習慣表1 8 1 a在AB C道路 上的平均車速為50km/h且在公路#2上的 平均車速為 70km/h。而依ABC道路及公 路#2，自目前位置192至次一加油站193 的距離分別為3.1km和5.7km。從而，預 測油料消耗1 3 4即為4.1 9 L除以5 0 k m然 後乘上 3.1km，以及 4.32L除以 50km然 後乘上5.7 k m，的總和。接著，當預測油 料消耗1 3 4大於油料記錄單元1 3 2的油料 量值135時，加油提示單元133即產生一 警告信號以提醒使用者先行加油。 現參照第4圖，其中說明根據本發明 之第二實施例，係為具有一加油提示功能 之可攜式導航設備的略圖。即如圖示，當 15 201115113 一車輛趨近一靠近導航路徑 191b的第一 加油站194時，一加油提示單元133可首 先對一自目前位置 192至一第二加油站 1 9 5 (亦即次一加油站）的導航路徑1 9 1 b進 行分析並將其劃分成複數個道路區段，同 時決定各個道路區段的道路等級，像是設 有各種車速限制的快速道路、高速公路、 收費道路、平面道路、高架道路、市區道 路或鄉區道路（或者可先行分析並決定導 航路徑 1 9 1 b的道路等級，然後再按照各 道路等級將自目前位置192至一第二加油 站1 9 5的導航路徑1 9 1 b劃分成複數個道 路區段），藉此取得各道路等級的平均車 速以根據一駕駛習慣表 1 8 1 b和一油料消 耗參考資料庫1 8 2來決定各道路區段的相 對應油料消耗速率，其單位可為每單位距 離的油料容積。然後，可藉由將各個油料 消耗速率乘上各道路區段的距離以計算 出各個道路區段的區段性油料消耗，並且 後續地加總各區段性油料消耗來產生預 測油料消耗1 3 4。在此，記憶單元1 8 0内 201115113 即如第4圖所示，一 DEF道路、公路 #4、公路#23和XYZ道路係經納入於自目 前位置192至第二加油站195的導航路徑 191b之内，並且對一使用者而言，根據駕 駛習慣表1 8 1 b而自目前位置1 9 2至第二 加油站195其平均車速分別為在DEF道路 上為40km/h，在公路#4上80km/h，在公 路#23 上 80km/h 且在 XYZ 道路上 60km/h。而各DEF道路、公路#4、公路#23 和 XYZ 道路上的距離則分別為 2km、 3.7 k m、8 k m及3.4 k m。如此，預測油料消 耗 134 即為 4.14L除以 50km然後乘上 2km，4.04L 除以 50km 然後乘上 3.7km， 4.04L除以50km然後乘上8km，以及4.25L 除以 5 0 k m然後乘上 3.4 k m，的總和。接 著，當預測油料消耗1 3 4大於油料記錄單 元1 3 2的油料量值1 3 5時，加油提示單元 1 3 3即產生一警告信號以提醒使用者在第 一加油站1 9 4處加油。 如第5圖說明，根據本發明之第三實 施例，係為於一可攜式導航設備上執行加 油提示功能之方法的流程圖。圖中，方法 係經應用於可攜式導航設備，藉以避免使 17 201115113 用者在行旅過程中耗盡油料，包含下列步 驟：在步驟S51處，建立一駕駛習慣表， 係根據一使用者的駕駛習慣記錄有複數 個道路等級以及複數個相對應的平均車 速。然後，在步驟S52處提供儲存車速與 油料消耗速率間之關係的' —油料消耗參 考資料庫，並且在步驟S 5 3處提供一記錄 油料量值的油料記錄表，接著一路徑導航 單元可在步驟S54處產生自一起點至一目 的地的一導航路徑。由於產生一導航路徑 的技術為眾所週知，故而在此不予贅述。 在步驟S55處，在當一目前位置趨近 一靠近導航路徑的加油站時，或是在當產 生一新的導航路徑或一經重新規劃的路 徑時，藉由利用一加油提示單元而根據導 航路徑、駕駛習慣表及油料消耗參考資料 庫以自動地計算出對於自目前位置行旅 至一靠近導航路徑之次一加油站所需的 預測油料消耗。接著，在步驟S 5 6處，當 預測油料消耗大於油料量值時，向使用者 提示警告信號。例如，假設預測油料消耗 為1 0.5 L，然而油料量值為6 L，則表示使 用者若未加油即無法抵達目的地，故而產 201115113 生警告信號並按影像或音訊方式輸出，藉 以提醒使用者需先行加油。 第6圖說明，根據本發明之另一具體 實施例，用以在一可攜式導航設備上執行 一加油提示功能之方法的流程圖。在圖 中，一使用者正按照一導航路徑行旅，同 時執行加油提示功能以提醒使用者進行 B 加油，包含下列步驟。在步驟S 6 1處，取 得所有靠近導航路徑的加油站。在步驟 S62處，決定使用者是否趨近一第一加油 站。其中，可攜式導航設備可依即時方式 產生使用者的目前位置，同時若使用者之 目前位置與第一加油站之間的距離小於 一預定距離值，則斷定使用者趨近第一加 油站。 • 在步驟S63處，若使用者正趨近第一 加油站，則計算出自目前位置至第二加油 站（亦即次一加油站）所需要的預測油料消 耗。或者，若鄰近加油站為使用者於此一 導航路徑上將能經過的最後一者，則計算 出到達目的地的預測油料消耗。 在步驟S64處，獲取目前油料量值並 201115113 且與預測油料消耗相比較，同時若目前油 料量值小於預測油料消耗，則在步驟S 6 5 處產生警告信號。警告信號進一步更係按 視像形式或音聽形式所輸出，藉以提醒使 用者需在先前加油站處進行加油，否則使 用者可能無法抵達次一加油站或目的地。 以上所述僅為舉例性，而非為限制性 者。任何未脫離本發明之精神與範疇，而 對其進行之等效修改或變更，均應包含於 後附之申請專利範圍中。 【圖式簡單說明】 第1圖 根據先前技藝之可攜式導航設 備的方塊圖； 第2圖 根據本發明具有一加油提示 功能之可攜式導航設備的方塊 圖； 第3圖 根據本發明第一實施例之具有 加油提示功能之可攜式導航設 20 201115113 備的略圖； 第4圖 根據本發明第二實施例之具有 加油提示功能之可攜式導航設 備的略圖； 第5圖 根據本發明第三實施例之用以 & 在一可攜式導航設備上執行加 油提示功能之方法的流程圖； 以及 第6圖 根據本發明之第四實施例之用 以在可攜式導航設備上執行加 油提示功能之方法的流程圖。 [s ] 21 201115113 【主要元件符號說明】 10 :可攜式導航設備； 11 : GPS 衛星； 12 : GPS接收器； 1 3 :處理單元； 14 :電子地圖資料庫； 1 5 :顯示單元； 16 :音訊輸出單元； 17 :輸入單元； 18 :記憶單元； 1〇〇:具有加油提示功能的可攜式導航 設備； 1 3 1 :路徑導航單元； 1 3 2 :油料記錄單元； 1 3 3 :加油提示單元； 1 3 4 :預測油料消耗； 201115113 1 3 5 :油料量值； 1 8 1 :駕駛習慣表； 1 8 1 a :駕駛習慣表； 1 8 1 b :駕駛習慣表； 1 8 2 .油料消耗參考資料庫， | 1 9 1 a :導航路徑； 1 9 1 b :導航路徑； 1 9 2 :目前加油站； 1 9 3 :次一加油站； 194 :第一加油站； 1 9 5 :第二加油站；以及 S5 1〜S56 :步驟°201115113 VI. Description of the Invention: [Technical Field] The present invention relates to a portable navigation device and a method thereof, and more particularly to a portable navigation device having a fueling reminding function and a method thereof. [Prior Art] _ Portable navigation devices are now becoming more and more popular with new technologies, and in particular, portable navigation devices further include navigation, memos by combining various characteristics of PDAs, mobile phones or MP3 players, and the like. , a combination of communication and entertainment. However, in terms of navigation, the user is most concerned about the fuel problem, that is, whether the oil content can complete the navigation path. At present, the on-board computer is often equipped with an oil reminder system. However, the portable navigation device generally lacks the fueling reminder function. Since portable navigation devices are widely used, it is advantageous to have a fueling reminder function in a portable navigation device. However, portable navigation devices are indeed different from on-board computers and cannot monitor driving conditions and fuel content, so in the existing market, 4 201115113 portable navigation devices are not equipped with this fueling reminder. Referring now to Figure 1, there is shown a block diagram of a portable navigation device in accordance with conventional techniques. That is, as illustrated, the portable navigation device 10 transmits a satellite positioning data through a GPS satellite 11 and the GPS receiver 12 transmits the satellite positioning data to the processing unit 13. After the processing unit 13 learns the current location of the portable navigation device 10, the electronic map is then retrieved from the electronic map database 14 to obtain the geographic relationship between the portable navigation device 1 and the destination. . The portable navigation device 10 further includes a display unit 15, an audio output unit 16, and an input unit 177, which are regarded as an operation interface for communicating with a user, and the user can thereby input the intended purpose. Ground. Finally, the processing unit 13 performs mathematical operations through a path navigation unit 131 to provide a navigation path to the user. The path navigation unit 131 can be implemented by loading and executing a path navigation computer program code embedded in the memory unit 18. The aforementioned workflow is the original model of various types of navigable navigation devices on the existing market. Therefore, the people who rely on the project are committed to integrating this fueling reminder function into the portable 5 201115113 navigation device. According to the foregoing problems, the inventors of the present invention have conducted extensive research and experiments to accumulate successful development and design results; therefore, a portable navigation device with a fueling reminding function is proposed as a basis and implementation for improving the problem. . SUMMARY OF THE INVENTION One object of the present invention is to provide a portable navigation device having a fueling reminding function and a method thereof for integrating a fueling reminding function into a portable navigation device. In accordance with the purpose of the present invention, a portable navigation device having a fueling reminder function is provided. The utility model comprises a display unit, an audio output unit, an input unit, a processing unit, an electronic map database, a memory unit, and a GPS receiver for receiving satellite positioning data from a GP S satellite, wherein the processing unit A path navigation unit for generating a navigation path is included. The portable navigation device of the present invention is characterized in that the memory unit comprises a driving habit table and an oil consumption reference library, and the processing unit further comprises an oil recording unit and a fueling reminding unit. The path navigation unit, the oil recording unit, and the fueling reminder unit can be implemented by loading and executing path navigation, fuel recording, and fueling prompt computer code, respectively, into the memory unit. The driving habit table can record a plurality of road grades corresponding to a plurality of average speeds according to a user's driving habit, and the relationship between the vehicle speed and the fuel consumption rate is stored in the fuel consumption reference database. The oil record unit records the amount of oil. The fueling reminder unit can be based on the navigation route, the driving habit table, and the fuel consumption reference library when the current location approaches the gas station near the navigation path, or when a new navigation path or a re-planned path is generated. At the time, the predicted fuel consumption required for the next *gas station from the current location to the navigation path is automatically calculated and a warning signal can be prompted when the predicted fuel consumption is greater than the fuel amount. In accordance with the purpose of the present invention, a method for performing a fueling reminder function on a portable navigation device includes the following steps: establishing a driving habit table to record a number of 201115113 recordings according to a user's driving habits. a road grade corresponding to a plurality of average speeds; a fuel consumption reference database is provided to store the relationship between the vehicle speed and the fuel consumption rate; an oil record table is provided to record the oil amount value; and the route navigation unit is utilized to generate a navigation a path; and using a fueling reminder unit to follow a navigation path, a driving habit table, and a fuel consumption reference library when the vehicle is approaching a navigation station near the navigation path, or when a new navigation path is generated or once again When planning the route, the predicted fuel consumption required for the next gas station from a current location to the navigation path is automatically calculated, and a warning signal is presented when the predicted fuel consumption is greater than the fuel amount. Here, the step of automatically calculating the predicted fuel consumption further comprises the steps of: dividing the navigation path from the current position to the next gas station into a plurality of road sections; determining the road grade of each road section; obtaining the road grade Average vehicle speed to determine the corresponding fuel consumption rate for each road segment; by multiplying the individual fuel consumption rates by the respective distances of the various road segments to account for each segmental fuel consumption of each road segment; The segmental fuel consumption is summed to produce a predicted fuel consumption. 8 201115113 As described above, the portable navigation device with the fueling reminder function according to the present invention can provide one or more of the following advantages: (1) The present invention allows the user to know whether the current fuel amount is sufficient. Travel to the next gas station near the navigation route or destination; if not, a fueling reminder signal can be generated to alert the user to refuel first to avoid running out of fuel on the road. (2) The present invention can preliminarily use the various grades of the road as a reference to improve the fuel consumption rate estimation. (3) Oil consumption can be calculated based on the user's driving habits. [Embodiment] Referring now to FIG. 2, which is a block diagram of a portable navigation device having a fueling reminding function according to the present invention, as shown in the figure, a portable navigation device 100 having a fueling reminding function may include a GPS receiver 12 for receiving satellite positioning data from a GPS satellite 11, a processing unit 13 , an electronic map resource 201115113 library 14, a display unit 15, an audio output unit 16, an input unit 17 and a Memory unit 18. It should be noted that the processing unit 13 can include a path navigation unit 133, an oil recording unit 133, and a fueling reminder unit 133, and the memory unit 18 can include a driving habit table 181 and an oil. Consume reference library 1 8 2. The path navigation unit 1 3 1 , the oil recording unit 1 3 2 and the fueling reminding unit 1 3 3 can be used to load and execute the path navigation, oil record and fueling prompt computer program embedded in the memory unit 18, respectively. The code is implemented. Here, the path navigation unit 131 is planned to generate a navigation path. The driving habits table 1 8 1 can record a plurality of road grades and a plurality of corresponding average vehicle speeds according to a user's driving habits. The driving habit table 181 is preferably determined by statistical analysis of satellite positioning data received from the GPS receiver 12 during normal driving by the user, or by manual input through the input unit 17, The average vehicle speed corresponding to each of the plurality of road grades is obtained for the user. Memory unit 1 8 can contain more than one driving habit table 1 8 1 for recording the driving habits of different users. 201115113 Oil Consumption Reference Library 1 8 2 can be used to store the relationship between vehicle speed and fuel consumption rate. The fuel consumption reference library 182 is preferably provided via a vehicle or via manual input through the input unit 17. In other words, the user can manually set the fuel consumption reference library 1 8 2 . For example, the user can obtain fuel consumption data for his vehicle from a manufacturer. In general, vehicle manufacturers can provide fuel consumption rates for vehicles at different speeds. However, the fuel consumption data of the vehicle is roughly determined according to the driving habits of the user and the road conditions of the traffic jam or traffic sign. Therefore, it is also possible to establish the fuel material by recording the oil consumption data during the usual driving process according to the present invention. Consume reference library 1 8 2. In addition, if the portable navigation device 1 〇 0 is connected to the onboard computer, the fuel consumption reference library 1 8 2 can be obtained from the onboard computer. Techniques for recording oil consumption data are well known and will not be described here. At the same time, the oil recording unit 133 can record the value of the oil parameter. Preferably, the oil record unit 1 3 2 is provided via an onboard computer or by accepting manual input through the input unit. In addition, the oil record unit 132 provides an operating interface that allows the use of the 201115113 to enter the amount of fuel when the vehicle enters a gas station. The operation interface can include various option buttons and images, such as the tank filling, the amount of fuel added, and the price of the fuel, so that the user can input the fuel parameter value of the fueling. For example, the oil record unit 132 can include a fueling button to provide travel distance between multiple refuelings, thereby calculating an average fuel consumption rate. After filling up the empty fuel tank of the vehicle, you can press the fuel button to get the total travel distance between the vehicle and the previous fueling station recorded by the current refueling and portable navigation equipment, and the travel distance and the content of the oil tank can be utilized. The denominator and the numerator are used separately to calculate the average fuel consumption rate. This information can also be used as a source of reference for the oil consumption reference library. In addition, the fueling prompting unit 133 can set a predetermined distance value when a vehicle approaches a navigational station near the navigation path, and when the distance between the two is less than the value, it is determined to be approaching, or when When a new road control or '-re-planned path is generated', the pre-requisites required for the next gas station from the current location to the navigation path are automatically calculated according to the navigation route, the driving habit table and the fuel consumption reference library. 12 201115113 Fuel consumption, that is, the user can set a predetermined distance value. When the distance between the two is less than this value, it is determined to be close, and a warning signal is prompted when the predicted fuel consumption is greater than the oil amount. Therefore, when the fuel amount of the vehicle is lower than the predicted fuel consumption, that is, the navigation path cannot be completed according to the remaining oil, the portable navigation device 100 having the fueling reminding function of the present invention will notify the user that the fuel needs to be refueled immediately, for example, In the form of a warning sound or a flash, respectively, through the display unit 15 or the audio output unit 16, the vehicle is prevented from malfunctioning on the road. Meanwhile, the portable navigation device 100 having the fueling reminding function may further include a fueling button. The fuel button can be expressed as an image or a key. When the user presses the fueling button, the path navigation unit 131 can search for a nearby gas station located near the user and provide a navigation path that directs the user to the adjacent gas station. In addition, when it is determined that the current vehicle position of the portable navigation device 100 is located at a gas station, an operation interface can then be presented and displayed on the display unit 15 for the user to input the current fuel amount value. Referring now to Figure 3, there is illustrated a schematic diagram of a portable navigation device having a fueling alert function in accordance with a first embodiment of the present invention 13 201115113. That is, if a new path or a re-planned path is generated, for example, a user just starts a portable navigation device or changes a path or destination, a fueling prompting unit 133 may first analyze one. From a current position 192 to a navigation station 1 9 3 navigation path 1 9 1 a and divide it into a plurality of road sections, and at the same time determine the level of each road section, such as a fast road with various speed limits , highways, toll roads, plane roads, elevated roads, urban roads or rural roads, to obtain the average speed of road grades, according to a driving habits table 1 8 1 a and oil consumption reference database 1 8 2 The corresponding fuel consumption rate of the road section is determined, the unit of which may be, for example, the oil volume per unit distance. The predicted fuel consumption can then be calculated by multiplying the individual fuel consumption rates by the distance of each road segment to calculate the segmental fuel consumption for each road segment and summing the segmental fuel consumption to produce a predicted fuel consumption 1 34. Here, the functions and properties of the respective elements in the processing unit 13 and the memory unit 18 are similar to those in Fig. 2, and the description thereof will be omitted for the sake of simplification. In other words, if the portable navigation device needs to recalculate 14 201115113 to calculate a new navigation path, for example, the user changes the destination or turns at the wrong intersection, after the new navigation path is calculated, the fueling prompt unit 133 The next gas station near the new navigation route will be searched and the aforementioned oil inspection inquiry procedure will be performed again. For example, as shown in FIG. 3, after a new navigation path is generated, and an ABC road and a highway #2 are included in the navigation path 191a from the current position 192 to the next gas station 193, and simultaneously For a user, the average speed on the AB C road is 50 km/h according to the driving habits table and the average speed on the highway #2 is 70 km/h. According to ABC Road and Road #2, the distance from the current location 192 to the next gas station 193 is 3.1 km and 5.7 km, respectively. Thus, the predicted fuel consumption of 1 3 4 is 4.1 9 L divided by 5 0 k m and then multiplied by 3.1 km, and 4.32 L divided by 50 km and then multiplied by 5.7 k m. Next, when the predicted oil consumption 134 is greater than the oil amount 135 of the oil recording unit 133, the fueling prompting unit 133 generates a warning signal to remind the user to refuel first. Referring now to Figure 4, there is illustrated a schematic diagram of a portable navigation device having a fueling alert function in accordance with a second embodiment of the present invention. That is, as shown in the figure, when a vehicle approaches a first gas station 194 near the navigation path 191b, a fueling prompting unit 133 may firstly operate from a current position 192 to a second gas station 1 9 5 (ie, The navigation route of the second gas station is analyzed and divided into a plurality of road sections, and the road grades of the various road sections are determined, such as expressways, highways, and tolls with various speed limits. Roads, flat roads, elevated roads, urban roads or rural roads (or road grades of the navigation route 1 9 1 b can be analyzed and determined first, and then from the current location 192 to a second gas station according to each road grade 1 The navigation path of 9 5 is divided into a plurality of road sections), thereby obtaining an average vehicle speed of each road grade to determine each according to a driving habit table 1 8 1 b and an oil consumption reference library 1 8 2 The corresponding fuel consumption rate of the road section, the unit of which can be the oil volume per unit distance. Then, the segmental oil consumption of each road segment can be calculated by multiplying the individual fuel consumption rates by the distance of each road segment, and then each segmental fuel consumption is summed to generate predicted fuel consumption. 4. Here, the memory unit 1180 is as shown in FIG. 4, and a DEF road, highway #4, highway #23, and XYZ road are incorporated in the navigation path 191b from the current position 192 to the second gas station 195. Within the user, and according to the driving habits table 1 8 1 b, the average speed from the current position 1 9 2 to the second gas station 195 is 40 km/h on the DEF road, respectively, on the highway #4 Upper 80km/h, 80km/h on highway #23 and 60km/h on XYZ road. The distances on the DEF Road, Highway #4, Highway #23 and XYZ roads are 2km, 3.7k m, 8km and 3.4km, respectively. Thus, the predicted fuel consumption 134 is 4.14L divided by 50km and then multiplied by 2km, 4.04L divided by 50km and then multiplied by 3.7km, 4.04L divided by 50km and then multiplied by 8km, and 4.25L divided by 50 km and then multiplied The sum of 3.4 km. Then, when the predicted fuel consumption 134 is greater than the oil amount value 1 3 5 of the oil recording unit 133, the fueling prompt unit 133 generates a warning signal to remind the user to refuel at the first gas station 194. . As illustrated in Figure 5, a third embodiment of the present invention is a flow diagram of a method of performing a fueling reminder function on a portable navigation device. In the figure, the method is applied to a portable navigation device to avoid causing the user to run out of fuel during the travel process, and the following steps are included: at step S51, a driving habit table is established, according to a user's Driving habits are recorded with a plurality of road grades and a plurality of corresponding average speeds. Then, at step S52, a fuel consumption reference library storing the relationship between the vehicle speed and the fuel consumption rate is provided, and an oil record table for recording the oil amount value is provided at step S53, and then a path navigation unit can be At step S54, a navigation path from a point to a destination is generated. Since the technique of generating a navigation path is well known, it will not be described here. At step S55, when a current location approaches a gas station near the navigation path, or when a new navigation path or a re-planned path is generated, the navigation path is utilized by utilizing a fueling prompting unit. The driving habit table and the fuel consumption reference library automatically calculate the predicted fuel consumption required for the next gas station from the current location to a navigation route. Next, at step S56, when the predicted fuel consumption is greater than the oil amount, the warning signal is presented to the user. For example, suppose that the predicted fuel consumption is 1 0.5 L. However, if the oil value is 6 L, it means that the user cannot reach the destination without refueling. Therefore, the 201115113 warning signal is generated and output as video or audio to remind the user. Need to refuel first. Figure 6 illustrates a flow chart of a method for performing a fueling alert function on a portable navigation device in accordance with another embodiment of the present invention. In the figure, a user is following a navigation path and performing a fueling reminder function to remind the user to perform B refueling, including the following steps. At step S61, all gas stations near the navigation path are taken. At step S62, it is determined whether the user approaches a first gas station. The portable navigation device can generate the current location of the user in an instant manner, and if the distance between the current location of the user and the first gas station is less than a predetermined distance value, it is determined that the user approaches the first gas station. . • At step S63, if the user is approaching the first gas station, the predicted fuel consumption required from the current position to the second fuel station (i.e., the next gas station) is calculated. Alternatively, if the adjacent gas station is the last one that the user will pass on this navigation path, the predicted fuel consumption to the destination is calculated. At step S64, the current fuel amount value is acquired and 201115113 is compared with the predicted fuel consumption, and if the current oil amount is less than the predicted fuel consumption, a warning signal is generated at step S65. The warning signal is further output in the form of video or audio, to remind the user to refuel at the previous gas station, otherwise the user may not be able to reach the next gas station or destination. The foregoing is illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a portable navigation device according to the prior art; FIG. 2 is a block diagram of a portable navigation device having a fueling reminding function according to the present invention; FIG. 4 is a schematic diagram of a portable navigation device having a fueling reminding function according to a second embodiment of the present invention; FIG. 5 is a schematic diagram of a portable navigation device having a fueling reminding function; A flowchart of a method for performing a fueling prompt function on a portable navigation device in accordance with a third embodiment; and FIG. 6 is for performing on a portable navigation device according to a fourth embodiment of the present invention Flowchart of the method of refueling the prompt function. [s ] 21 201115113 [Description of main component symbols] 10 : Portable navigation device; 11 : GPS satellite; 12 : GPS receiver; 1 3 : Processing unit; 14 : Electronic map database; 1 5 : Display unit; : audio output unit; 17: input unit; 18: memory unit; 1〇〇: portable navigation device with fueling reminder function; 1 3 1 : path navigation unit; 1 3 2: oil recording unit; 1 3 3 : Refueling reminder unit; 1 3 4: predicted oil consumption; 201115113 1 3 5: oil quantity; 1 8 1 : driving habits; 1 8 1 a: driving habits; 1 8 1 b: driving habits; 1 8 2 Oil Consumption Reference Library, | 1 9 1 a : Navigation Path; 1 9 1 b : Navigation Path; 1 9 2: Current Gas Station; 1 9 3: Next Gas Station; 194: First Gas Station; 5: second gas station; and S5 1~S56: step °