What is the working principle of a four-stroke internal combustion engine?
1 Answers
The working principle of a four-stroke internal combustion engine is as follows: The working process of a four-stroke internal combustion engine consists of four strokes: intake, compression, power, and exhaust. These four strokes form one working cycle. During one working cycle, the piston reciprocates twice, and the crankshaft rotates two turns. Among the four strokes, only the power stroke generates external work, while the other three strokes are completed by the inertia of the flywheel. Here are some additional details: 1. Intake stroke: The intake valve opens, the exhaust valve closes, the piston moves downward, and a 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, causing the fuel to burn violently and produce high-temperature, high-pressure gas. This high-temperature, high-pressure gas pushes the piston downward, driving the crankshaft to rotate and perform external work. 4. Exhaust stroke: The intake valve closes, the exhaust valve opens, the piston moves upward, and the exhaust gas is expelled from the cylinder.
