作用：汽车发动机是为汽车提供动力的装置，是汽车的心脏，是一个能量转换装

作用：汽车发动机是为汽车提供动力的装置，是汽车的心脏，是一个能量转换装置，作用是将汽油(柴油)的热能通过在密封汽缸内燃烧后膨胀气体，推动活塞作功，转变为机械能。根据动力来源不同，汽车发动机可分为柴油发动机、汽油发动机、电动汽车电动机以及混合动力等。<br>基本组成：汽车发动机通常由两大机构五大系统组成，曲柄连杆机构、配气机构、燃料系、冷却系、润滑系、点火系、起动系。<br><br>工作原理：汽车发动机分为汽油机和柴油机，两者都属于往复活塞式内燃机，是将燃料的化学能转化为活塞运动的机械能并对外输出动力。<br> 汽油发动机转速高，质量小，噪音小，起动容易，制造成本低，柴油发动机压缩比大，热效率高，经济性能和排放性能都比汽油机好

作用：汽车发动机是为汽车提供动力的装置，是汽车的心脏，是一个能量转换装置，作用是将汽油(柴油)的热能通过在密封汽缸内燃烧后膨胀气体，推动活塞作功，转变为机械能。 根据动力来源不同，汽车发动机可分为柴油发动机、汽油发动机、电动汽车电动机以及混合动力等。<br>基本组成：汽车发动机通常由两大机构五大系统组成，曲柄连杆机构、配气机构、燃料系、冷却系、润滑系、点火系、起动系。<br><br>工作原理：汽车发动机分为汽油机和柴油机，两者都属于往复活塞式内燃机，是将燃料的化学能转化为活塞运动的机械能并对外输出动力。<br> 汽油发动机转速高，质量小，噪音小，起动容易，制造成本低，柴油发动机压缩比大，热效率高，经济性能和排放性能都比汽油机好

Function: the automobile engine is a device that provides power for the automobile, the heart of the automobile, and an energy conversion device. Its function is to convert the heat energy of gasoline (diesel) into mechanical energy by expanding the gas after combustion in the sealed cylinder, pushing the piston to work. According to different power sources, automobile engines can be divided into diesel engine, gasoline engine, electric vehicle motor and hybrid power.<br>Basic composition: automobile engine is usually composed of two mechanisms and five systems, including crank and connecting rod mechanism, valve mechanism, fuel system, cooling system, lubrication system, ignition system and starting system.<br>Working principle: the automobile engine is divided into gasoline engine and diesel engine, both of which belong to reciprocating piston internal combustion engine. They convert the chemical energy of fuel into the mechanical energy of piston movement and output power to the outside.<br>Gasoline engine has the advantages of high speed, low quality, low noise, easy starting, low manufacturing cost, large compression ratio, high thermal efficiency, better economic performance and emission performance than gasoline engine<br>