Kompressionsfasen

Kompressionsfasen, also known as the compression stroke or compression phase, is a critical stage in the four-stroke internal combustion engine cycle. It occurs between the intake stroke and the combustion stroke. During this phase, the piston moves from the bottom dead center (BDC) to the top dead center (TDC), compressing the air-fuel mixture (in a gasoline engine) or just air (in a diesel engine) within the cylinder.

The primary purpose of the compression stroke is to increase the pressure and temperature of the charge, thereby improving combustion efficiency. This is achieved through the mechanical work done by the piston as it moves upward. The compression ratio, which is the ratio of the cylinder volume at TDC to the volume at BDC, is a key factor in determining the efficiency of this process.

The compression stroke is crucial for engine performance, as it directly influences the power output and fuel efficiency. A higher compression ratio generally leads to better fuel efficiency and higher power output, but it also increases the risk of engine knocking (pre-ignition) and can cause wear and tear on engine components. Therefore, the compression ratio is carefully optimized based on the specific design and operating conditions of the engine.

In summary, the compression stroke is a vital phase in the operation of internal combustion engines, where the air-fuel mixture is compressed to enhance combustion and power generation. Its efficiency and effectiveness are determined by factors such as the compression ratio and the engine's design.