What is the Structure and Principle of an Automobile Engine?

[JudahAnn]

Here is a detailed explanation of the structure and principle of an automobile engine: 1. Structure: A gasoline engine typically consists of two major mechanisms (crank-connecting rod and valve train) and five major systems (fuel supply, lubrication, cooling, ignition, and starting). A diesel engine usually comprises two major mechanisms and four major systems (lacking the ignition system). 2. Principle: The process by which an engine converts thermal energy into mechanical energy is achieved through four continuous stages: intake, compression, power, and exhaust. Each complete sequence of these stages is called a working cycle. If the crankshaft rotates twice and the piston completes four strokes to finish one working cycle, it is called a four-stroke engine. If the crankshaft rotates once, meaning the piston completes two strokes to finish one working cycle, it is called a two-stroke engine.