臺灣博碩士論文加值系統

目前引擎修護技師於四行程引擎進汽門洩漏的診斷工作上，大都使用壓縮壓力錶、真空錶與空氣流量錶來進行。這些儀錶中，有些使用上稍嫌不便；有些則精密度不高，無法偵測出進汽門微量洩漏的現象。
本研究乃以汽車修護工廠普遍使用的電子示波器，搭配車用的進汽歧管絕對壓力(MAP)感知器來觀察一具四缸四行程引擎在發生進汽門洩漏時，其進汽歧管內的真空脈波變化，進而找出電子示波器波形的波峰與進汽門洩漏程度的關係，以期能透過波形的觀察來判斷進汽門洩漏的現象。
本研究結果顯示，應用電子示波器於引擎進汽歧管所擷取的波峰電壓值與進汽門的洩漏程度成線性關係，其平均R2值達0.985。而試驗中，進汽歧管真空脈波的量測位置經統計分析所得之F值均小於3.49，顯示此量測位置對各缸進汽門洩漏程度之偵測結果並無顯著影響。
因此，應用電子示波器於四缸四行程引擎進汽門洩漏偵測的方法是可行的，而且透過電子示波器觸發來源(trigger source)的安排，更可正確的分辨出發生進汽門洩漏的汽缸。

Currently, most of engine technicians utilize the compression pressure meter, vacuum gauge and air flow gauge to diagnose the intake valve leaking problem for four-stroke engines. Using these tools are found either not convenient or less accuracy for minor leakage.
The electronic oscilloscope, which is generically equipped in modern automotive workshop, was used in this research associated with the manifold absolute pressure sensor (MAP) installed on modern vehicles to observe the vacuum pulse variation in an intake manifold when a intake valve leaking problem occurred in an four-cylinder-four-stroke engine. Based on the findings, one could study the relation between intake valve leakage quantities and waveform’s spikes captured by an electronic oscilloscope. The study, thus, expected to find those intake valve leaking problems by studying their waveform.
The results showed that the waveform’s spikes captured by an oscilloscope having linear relation with the quantity of the intake valve leakage. The average value of R2 was calculated to be 0.985. To verify the effect of measuring locations, one way ANOVA analysis was used. Results showed that the F value was less than 3.49 for each location. That is, measuring locations did not affect the leaking measurements significantly. Thus, applying an electronic oscilloscope to detect the leaking problem in intake valves of a four-cylinder-four-stroke engine is possible. In addition, by appropriately arranging electronic oscilloscope’s trigger source, the linking intake valve could be precisely identified.

謝誌………………………………………………………….………….I
摘要……………………………………………………………………...II
Abstract………………………………………………………………….III
目錄…………………………………………………………………….IV
圖目錄……………………………………………..………………….VI
表目錄……………………………………….………………………IX
第一章緒論……………….………..…………………………………..1
1.1 前言…………………………………………………………..1
1.2 研究目的……………………………………………………..3
第二章文獻探討………………………………………………………4
2.1 四行程引擎工作循環與汽門機構…………………………..4
2.1.1 四行程引擎工作循環………………………………….4
2.1.2 四行程引擎汽門機構………………………………….5
2.1.2.1 汽門的構造…….………………………………5
2.1.2.2 汽門重疊現象……….……………………….…7
2.2引擎點火順序與汽缸之排列………………………………..8
2.3引擎進汽門洩漏檢測方法…………..……………………..9
2.3.1 壓縮壓力錶檢測法…………………………….…….9
2.3.2 真空錶檢測法………………………….…………….11
2.3.3 流量錶檢測法………………………….…………….13
2.4引擎進汽歧管絕對壓力感知器…………………………….14
2.5電子示波器在汽油引擎修護上的應用……………………15
2.5.1常用電子示波器名詞說明………………………..…15
2.5.2電子示波器在汽油引擎修護上的應用…………..…17
第三章實驗設備……………………….……………………………..20
3.1四行程汽油引擎………….…………………..………...20
3.2電子示波器……………….……………………………21
3.3空氣流量錶……….…….………….…………………..21
3.4 壓縮壓力錶………………………………….………..22
3.5 真空錶….……………………………………………..23
3.6 車用進汽歧管絕對壓力感知器…….………………..24
第四章實驗方法…….………………………………………………..26
第五章結果與討論….……………………………………………….35
5.1 引擎進汽歧管真空壓力波形基礎分析………………………35
5.2進汽門洩漏程度與電子示波器波形的變化關係…………….37
5.2.1 各汽缸進汽門不同洩漏程度的電子示波器波形觀察..37
5.2.2 進汽門洩漏程度與電子示波器波形變化分析………..47
5.3電子示波器與傳統進汽門洩漏診斷方法之檢測結果比對….48
5.3.1各汽缸各種進汽門洩漏診斷方法之實驗統計…………48
5.3.2電子示波器與傳統進汽門洩漏診斷方法之檢測比對…54
第六章結論與建議……….…………………………………………62
參考文獻………………….…………………………………………...64

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