本論文主要是針對汽車多媒體導航裝置在各種功能模式下之消耗功率及溫度做一研究討論，目的在於如何改善汽車多媒體導航裝置之散熱，避免過熱保護或當機。使用之實驗方法是以定電壓的方式，先在平台上對每一個功能模式確認其消耗電流並計算出消耗功率。進一步再使用溫度紀錄器量測出每一個功能模式之溫度曲線圖，兩者做一比較，可以確認出數位化視頻光碟模式加上衛星導航模式其消耗功率最大，溫度亦是最高狀態，故選定為此次研究之目標功能模式。接下來需在實車上架設量測設備，進而研究各種導熱係數及散熱面積對溫度之關係。 在本論文中導熱係數及散熱面積是重要參數，其代表之意義為可以從汽車音響內將多少熱帶出汽車音響外，使汽車音響可以在標準溫度中或低於工作溫度中正常工作。因此隨著導熱係數及散熱面積之數值增加，可以有效地降低系統內之溫度，經過實驗數據及公式計算後，可以得到一優化結果，使用仕樣 – 3散熱鰭片、天寶(TEMPO) T16與Pioneer PMP-P-300C-D導熱片可以有效降低系統內溫度，達到讓系統正常工作的目的。 ;This paper focuses on the study of the navigational multimedia system and addresses the power consumption and temperature under various functions, the purpose is how to improve the navigational multimedia system device cooling, to avoid overheating protection or shutdown. Test method is based on constant voltage, where each function is tested for voltage used and in turn to compute the power consumption. The next step is to use temperature recorder to measure the temperature profile of each function. With this data we are able to verify that the digitized disc mode combining with GPS mode makes the power consumption and temperature highest. Therefore we use it as the main target model for this study. In this thesis, the thermal conductivity and cooling surface are important parameters, which indicate how much the amount of heat be dissipated from the multimedia system, so that the system can functioned well at standard temperature or even below a specified working temperature. With the increase in thermal conductivity and cooling surface we are able to effectively lower the temperature within the system, after experimental data and formula calculation, an optimization result can be obtained, using official type-3 HSK, TEMPO T16 and Pioneer PMP-P-300C-D heat conduction sheet can effectively reduce the temperature in the system, and achieve the purpose of making the system work normally.
