What is an engine?
2 Answers
An engine is a machine that converts other forms of energy into mechanical energy, including internal combustion engines (such as gasoline engines), external combustion engines (such as Stirling engines and steam engines), and electric motors. For example, internal combustion engines typically convert chemical energy into mechanical energy. Here is some related information: 1. Applications of engines: Engines can be used as power generation devices or refer to entire machines that include power units (e.g., gasoline engines, aircraft engines). 2. The birth of engines: The engine was first developed in the UK, so the concept of an engine originates from English. Its original meaning refers to "a mechanical device that generates power." 3. Classification of engines: Automotive engines can be divided into two main categories: gasoline engines and diesel engines. They share the same basic structure, consisting of two major mechanisms and five systems: the crankshaft-connecting rod mechanism, the valve train, the fuel supply system, the lubrication system, the cooling system, the ignition system, and the starting system. 4. How an engine works: An engine does not rotate on its own without reason; it requires an external force to provide the initial power, which is supplied by the engine's starting system. During normal operation, the engine's working cycle includes four piston strokes: intake, compression, power, and exhaust.
As a seasoned driver, I feel the engine is like the soul of a car, working under the hood. When I start the car, the engine ignites and generates powerful force by burning gasoline or diesel: it draws in a mixture of air and fuel, ignites it in the cylinders, and pushes the pistons up and down; this force is converted into rotational motion by the crankshaft, driving the wheels and enabling the car to accelerate or climb hills. Every time I drive, I can hear its roar and feel its vibrations, reminding me that it's always working hard. Without an engine, a car is just a decoration, unable to move forward; regular maintenance like changing the oil and cleaning the air filter can extend its lifespan and save fuel. I've encountered engine overheating issues, where the cooling system becomes critical—it must be checked immediately to avoid greater damage. With experience, I've come to appreciate the intricate design of engines: different types like four-cylinder engines provide smooth daily driving, while eight-cylinder engines deliver more explosive power. In short, it's not just a machine but the dynamic core that powers every journey.
