本书根据教育部高职高专技能型人才培养模式中培养汽车使用、维修方面的实用型专业人才的目标，为了适应新时期职业院校汽车专业英语的教学要求，结合汽车专业实际需要和教学改革经验编写而成。本书旨在使学生熟悉本专业的英语词汇及用法，了解汽车领域科技文章的结构及体裁，培养学生英语阅读能力和翻译能力，以便更好地直接从国外资料中获取先进的汽车科技信息和知识。
本书针对汽车相关专业的学生英语学习现状，力求浅显、简明、实用性强。需兼顾汽车运用专业、汽车电工电子专业、汽车制造技术专业、汽车整形技术专业等对各部件组成、结构和原理以及较先进的技术资料的要求，也要兼顾汽车营销专业、汽车公估与保险实物专业既要求有结构和原理知识又需要相关的营销和保险知识的需要，设置了情景对话。而且考虑课时有限，篇章力求精而专。因此本教材编写在章节选用上采用汽车基础章节，以求适应面更广。每章前均提出“学习目标”“知识目标”，采用大量的图形和照片来配合讲解各部件组成、结构和原理，展示当前的设备、零部件和系统。每章中都提出问题，结合学习目标让学生思考，要求结合汽车实物，熟悉各部件组成、结构和原理；并给出模拟场景、实物图片等，让学生学会实际运用。各校可根据在教学中教学模式或课时安排需要，部分采用本教材内容。各单元自成体系，可侧重选用相关章节教学。
本书由湖南交通职业技术学院甘辉副教授任主编，湖南交通职业技术学院沈钡、张芳玲老师任副主编。其中，甘辉编写了第七单元与第十～十六单元，沈钡老师编写第二～六单元及对话内容，湖南交通职业技术学院张芳玲老师参与编写第八、九单元和部分中文翻译校稿，湖南交通职业技术学院田青老师编写第一单元，湖南交通职业技术学院许进副教授和黄倩老师编审情景对话，益阳职业技术学院王娇艳老师参与了部分编写整理工作。全书由湖南交通职业技术学院郑颖杰副教授主审。
本书是国家示范高职院校教学改革的阶段成果的一部分，是湖南中华职教社的丛书之一，并得到了中华职教社湖南分社和湖南省教育科学十二五规则课题(CSJK011G2ZJ044高职ESP老师双轨培养模式实证研究)的支持和帮助，在教学推广过程中广泛征求专家和专业老师的意见，得到了许多指导和帮助，在编写中参阅了国内外有关科技文献资料，在此对这些专家和作者一并表示衷心的感谢！
由于编者水平有限，书中难免有不妥之处，敬请读者不吝赐教。
编者
Engine
Engine is a power plant. Its function is to produce power by eombusting the fuel， and drive the automobile through the transmission system of the chassis. Gasoline engine and diesel engine are the most common engines. Gasoline engine is made up of the crank link mechanism， valve mechanism，fuel supply system， cooling system， lubrication system， ignition system and starting system. The way of ignition in diesel engines is compression-ignition， so diesel engine has no ignition system.
Classified by ways of piston ： the internal engine can be divided into reciprocating piston and ro-tary piston.
Classified by the air intake category： the internal combustion engine can be divided into natu-rally aspirated (non-supercharged) engine and forced into the gas (supercharged) engine based onits intake system， whether it adopts supercharger or not.
Classified by the arrangement of the cylinder： the internal combustion engine can be divided in-to single， double out-and three-style based on the arrangements， as well as inline V-type and op-posed.
Classified by the number of cylinders： the internal combustion engine can be divided into sin-gle-cylinder engine and multi-cylinder engine based on the number of cylinders.
Classified by the ways of cooling： the internal combustion engine can be divided into water-cooled engine and air-cooled engine based on the ways of cooling.
Classified by the strokes： the internal combustion engine can be divided into four-stroke inter-nal combustion engine and two-stroke internal combustion engine in accordance to a complete work cycle with the number of strokes required.
Classified by the valves： the internal combustion engine can be divided into side-valve (SV) engine， side-eamshaft (OHV) engine， overhead camshaft (OHC) engine， variable valve timing (VTEC) engine and the Desmo valve train engine based on the use of different valves.
Classified by the type of fuel supplying： the internal combustion engine can be divided into car-buretor engine and EFI engine based on different types of fuel supplying.
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