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摘 要 为了解决日益严重的环境污染和能源危机的问题，开发了一种以天然气和柴油为燃料的电控双燃料发动机。它是在电控柴油机的基础上改装而成的，采用柴油引燃天然气的方式来工作。由于只需另外加装一套天然气供给系统，适当改变一下燃料供给策略，对原柴油机不必作什么改动，故改装简单、成本低。但改装后天然气替代率高，发动机排放性明显改善。 copyright paper51.com 本设计是在原YC6108电控柴油机的基础上，设计安装一套天然气供给系统，并充分利用原柴油机上的电控系统，通过加装相关传感器，精确控制柴油引燃量和天然气的供给量，来提高原发动机的经济性和排放性。具体来说，一方面分析了电控天然气发动机燃料供给策略，对天然气供给系统进行了整体设计；另一方面重点设计了天然气供给系统的一些主要专用装置，如：气瓶、瓶口阀、手动关闭阀、充气阀、燃气压力调节器、加温器等，对其它所需部件按国家标准进行了选用；同时还根据公交车车架，对天然气供给系统布置与安装进行了分析与设计。 http://www.paper51.com
关键词： 柴油机； 天然气； 双燃料发动机； 供气系统 内容来自论文无忧网 www.paper51.com copyright paper51.com Abstract http://www.paper51.com Inorder to solve the increasingly serious energy crisis and environmentalpollution problems, we develop a electronically controlled dual-fuel engine naturalfor natural gas and diesel fuel. It is Modified by a electronically controlledengine, and work by diesel igniting the natural gas. We only add a natural gassupply system on the diesel engine, and give some appropriate changes in thefuel supply strategy, but the diesel engines emissions significantly improved. paper51.com We develop thiselectronically controlled dual-fuel engine on the basis of the YC6108 DieselEngine. We make full use of the electronic control system on the diesel engine andprecisely control the diesel and natural gas supply to improve the engine ofthe economy and emissions. On the one hand, we analyze fuel supply strategy, anddesign the gas supply system; On the other hand, we focused on the design ofthe gas supply system for some major installations, such as: the cylinder, thecylinder valve, filling gas Valves, gas pressure regulator, heating regulator,etc. We also design the gas supply system layout and installation under the busframe. 内容来自论文无忧网 www.paper51.com Key words： Diesel engine; Natural gas; Dual-fuel diesel engine; Gas supply system copyright paper51.com
copyright paper51.com 目 录 paper51.com
1 前言...................................................................................................................................... 1 copyright paper51.com
2 原始设计数据...................................................................................................................... 2 内容来自www.paper51.com 2．1 柴油机数据................................................................................................................. 2 paper51.com 2．2 公交车数据................................................................................................................. 3 paper51.com 3 系统整体设计...................................................................................................................... 4 paper51.com 3．1 控制原理设计.............................................................................................................. 4 paper51.com 3．2 各部件功用................................................................................................................. 4 内容来自论文无忧网 www.paper51.com 3．2．1 气瓶................................................................................................................ 4 内容来自论文无忧网 www.paper51.com 3．2．2 压力调节器..................................................................................................... 5 paper51.com 3．2．3 气体流量阀..................................................................................................... 5 paper51.com 3．2．4 中央控制器..................................................................................................... 5 内容来自www.paper51.com 3．2．5 油门位置传感器.............................................................................................. 5 内容来自论文无忧网 www.paper51.com
3．2．6 柴油油量控制器.............................................................................................. 5 内容来自论文无忧网 www.paper51.com 3．2．7 冷却水温度传感器........................................................................................... 6 copyright paper51.com
3．2．8 控制面板......................................................................................................... 6 copyright paper51.com
4 储气系统设计...................................................................................................................... 7 http://www.paper51.com
4．1 气瓶设计..................................................................................................................... 7 copyright paper51.com 4．1．1 材料选择......................................................................................................... 7 内容来自www.paper51.com 4．1．2 储气压力确定.................................................................................................. 7 内容来自论文无忧网 www.paper51.com 4．1．3 结构设计......................................................................................................... 8 内容来自论文无忧网 www.paper51.com
4．1．4 尺寸设计......................................................................................................... 8 内容来自论文无忧网 www.paper51.com 4．2 手动关闭阀设计.......................................................................................................... 9 内容来自www.paper51.com 4．2．1 结构设计......................................................................................................... 9 copyright paper51.com 4．2．1 阀杆设计....................................................................................................... 10 http://www.paper51.com 4．3 瓶口阀设计................................................................................................................ 13 内容来自论文无忧网 www.paper51.com 4．3．1 结构设计....................................................................................................... 13 内容来自论文无忧网 www.paper51.com 4．3．2 泄放直径校核................................................................................................ 14 内容来自www.paper51.com 4．4 充气阀设计................................................................................................................ 15 http://www.paper51.com 4．5 其它部件选用............................................................................................................ 16 内容来自www.paper51.com 5 供给系统设计.................................................................................................................... 17 copyright paper51.com 5．1 燃气压力调节器设计.................................................................................................. 17 paper51.com 5．1．1 结构设计....................................................................................................... 17 内容来自论文无忧网 www.paper51.com
5．1．2 阀口设计....................................................................................................... 18 http://www.paper51.com 5．1．3 密封膜片设计................................................................................................ 20 paper51.com 5．1．4 弹簧设计....................................................................................................... 21 paper51.com 5．3 加温器设计................................................................................................................ 25 paper51.com 5．3 其它部件选用............................................................................................................ 26 paper51.com 6 总体布置............................................................................................................................ 27 paper51.com 6．1 气瓶布置................................................................................................................... 27 copyright paper51.com 6．2 气瓶架设计校核......................................................................................................... 30 内容来自www.paper51.com 7 结束语................................................................................................................................ 32 内容来自www.paper51.com 参考文献.................................................................................................................................. 33 http://www.paper51.com
致 谢.................................................................................................................................. 34 内容来自论文无忧网 www.paper51.com
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