Mar 26, 2022

How does a four stroke gasoline engine work?

The working process of a four stroke internal combustion engine is composed of four strokes: suction, compression, work, and exhaust.

Four strokes are a working cycle. In a working cycle, the piston reciprocates twice and the crankshaft rotates for two weeks. In the four strokes, only the power stroke gas does external work, and the other three strokes are completed by the inertia of the flywheel.

(1) Intake stroke: the intake valve opens, the exhaust valve closes, the piston moves downward, and the mixture of gasoline and air enters the cylinder;

(2) Compression stroke: both the intake and exhaust valves are closed, the piston moves upward, and the fuel mixture is compressed;

(3) Power stroke: At the end of the compression stroke, the spark plug generates an electric spark, which makes the fuel burn violently and produces high temperature and high pressure gas. The high-temperature and high-pressure gas pushes the piston downward, drives the crankshaft to rotate, and does external work;

(4) Exhaust stroke: the intake valve is closed, the exhaust valve is opened, the piston moves upward, and the exhaust gas is discharged from the cylinder

four stroke gasoline engine