| URN | etd-0118112-121150 | Statistics | This thesis had been viewed 599 times. Download 8 times. |
| Author | Kai-Yu Jheng | ||
| Author's Email Address | s630m_aristo@hotmail.com | ||
| Department | Institute of Mechatronic Engineering | ||
| Year | 2011 | Semester | 1 |
| Degree | Master | Type of Document | Master's Thesis |
| Language | zh-TW.Big5 Chinese | Page Count | 68 |
| Title | Efficiency Enhancement by Exhaust Pipe Refitting | ||
| Keyword | |||
| Abstract | An exhaust system usually comprises a manifold at the head, a catalytic converter in the middle, and mufflers at the tail. The pressure of these three components constitute the engine back pressure, which is a chief determinant of engine efficiency. When designing the exhaust system, the production cost, the engine efficiency, and the impact on the environment must be taken into account. Owing to environmental protection and regulation as well as production cost consideration, most exhaust systems are made with mass-produced modular castings, which undermine the engine performance efficiency. In general, the sales markets conduct neither numerical simulation nor field tests on the exhaust system. This research aims to establish an experimental method and standard procedures for controlling engine back pressure through exhaust pipe refitting, which would in turn enhance engine efficiency. Moreover, by improving the refitting design and technique, consumer expenses can be saved. In the experiment, the back pressure data of both the original exhaust system and the refitted exhaust pipe are collected. The engine back pressure is controlled by the ball valve of the original exhaust system coupled with the butterfly valve of the refitted pipe. Changes in engine back pressure under different on-off conditions of the two valves are measured using dynamometers and accelerometers. According to measurements, corresponding adjustments are made in terms of the pressure required by the catalytic converter, back pressure muffler and tail muffler. The actual dash speed recorded by a dynamometer is indicative of the engine efficiency. Experimental results show that the refitted exhaust pipe controls better the back pressure, which in turns shorten the reaching of dash speed by 1.5 sec and increase the engine horse power by 7 kW. The proposed refitting method can also expenses by 10%. |
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| Advisor Committee | |||
| Files | indicate in-campus access only | ||
| Date of Defense | 2012-01-09 | Date of Submission | 2012-01-18 |