What is the working principle of a car engine?

Release time:

2024-03-23

In a four-stroke gasoline engine, this conversion process includes four basic steps: intake stroke, compression stroke, power stroke, and exhaust stroke.

What is the working principle of a car engine?

The working principle of a car engine is to convert chemical energy into mechanical energy.
In a four-stroke gasoline engine, this conversion process involves four basic steps: intake stroke, compression stroke, power stroke, and exhaust stroke. The details are as follows:
Intake stroke. The piston moves from the top dead center to the bottom dead center, the intake valve opens, and the exhaust valve closes. At this time, the air and fuel mixture in the cylinder is drawn into the cylinder.
Compression stroke. The piston continues to move upward, the intake valve closes, and the exhaust valve remains open. At this time, the mixed gas in the cylinder is compressed, and the pressure and temperature rise.
Power stroke. When the piston is close to the top dead center, the spark plug ignites the mixture, causing violent combustion. The high-temperature and high-pressure gas pushes the piston downward, thereby transferring the energy generated by combustion to the crankshaft to drive the machine to operate.
Exhaust stroke. The exhaust valve closes, and the piston moves upward from the bottom dead center, expelling the exhaust gas generated by combustion from the cylinder.
In addition, the car engine also includes other systems such as a cooling system, lubrication system, ignition system, and starting system, which together ensure the normal operation and efficiency of the engine