(One)Start engine be to be that the automobile exercises the device providing driving force. Whose effect is to make fuel burn making power, and then the drive passing a chassis is that driving a carriage wheel makes an automobile run. The engine has the two kinds petrol engine and diesel mainly. Hyundai Motor adopt the dyadic piston internal-combustion engine moving back and forth broadly. It is to do the external output power's by the fact that the combustible gas burns swelling within the cylinder producing pressure , drives a piston to move and makes a crank shaft rotate by the connecting rod. Mainly, including two big organization and five large scale system, they are that crank bar linkage, matches gas organization , fuel supplies with system , firing system (petrol engine) , actuating system , cooling system and lubricating system are composed of. Diesel oil engine firing way is that pressure burns style , is therefore there being no firing. （一）发动机 发动机是为汽车行使提供动力的装置。其作用是使燃料燃烧产生动力，然后通过底盘的传动系驱动车轮使汽车行驶。发动机主要有汽油机和柴油机两种。 现代汽车广泛采用往复活塞式内燃发动机。它是通过可燃气体在汽缸内燃烧膨胀产生压力，推动活塞运动并通过连杆使曲轴旋转来对外输出功率的。主要包括两大机构和五大系统，它们是曲柄连杆机构、配气机构、燃料供给系统、点火系统（汽油发动机）、起动系统、冷却系统和润滑系统组成。柴油发动机的点火方式为压燃式，所以无点火系。
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