In a four-stroke Diesel engine, during which stroke is fuel injected into the cylinder?

In a four-stroke Diesel engine, during which stroke is fuel injected into the cylinder?

• A. Intake
• B. Combustion
• C. Power
• D. Compression

Answer: (D)

In a four-stroke Diesel engine, fuel injection occurs during the compression stroke. This phase follows the intake stroke, where air is drawn into the cylinder. Once the piston moves up during the compression stroke, the air is compressed to a high pressure and temperature. At the end of this stroke, just before the piston reaches the top dead center, the fuel is injected into the highly compressed air. This injection strategy is crucial as it allows the fuel to ignite spontaneously due to the high temperature of the compressed air, leading to combustion. By injecting during the compression stroke, the design capitalizes on the ideal conditions for efficient fuel combustion, optimizing engine performance and efficiency. The timing of this injection is key to the engine's operation, contributing to smoother power delivery and reduced emissions.

In a four-stroke Diesel engine, fuel injection occurs during the compression stroke. This phase follows the intake stroke, where air is drawn into the cylinder. Once the piston moves up during the compression stroke, the air is compressed to a high pressure and temperature. At the end of this stroke, just before the piston reaches the top dead center, the fuel is injected into the highly compressed air.

This injection strategy is crucial as it allows the fuel to ignite spontaneously due to the high temperature of the compressed air, leading to combustion. By injecting during the compression stroke, the design capitalizes on the ideal conditions for efficient fuel combustion, optimizing engine performance and efficiency. The timing of this injection is key to the engine's operation, contributing to smoother power delivery and reduced emissions.