Which cycle of the diesel engine involves the injection of fuel just after compression?

The correct response relates to the operation of a diesel engine, specifically indicating that the power cycle is where fuel injection occurs just after the compression stage. In a diesel engine, the cycle typically consists of four main strokes: intake, compression, power, and exhaust.

During the compression stroke, air is drawn into the cylinder and then compressed to a high pressure and temperature. Once this compression takes place, fuel is injected into the cylinder. The timing of this injection is crucial; it occurs right at the end of the compression stroke, which is when the temperature is sufficiently high to allow the fuel to ignite spontaneously upon contact with the hot compressed air. This process leads to the power stroke, where the combustion of the fuel pushes the piston down, generating power.

Therefore, the power cycle is characterized by this immediate injection following compression, optimizing the conditions for effective combustion and energy production.