What are the phases in a Direct Injection pressure volume cycle?

In a Direct Injection pressure-volume cycle, the correct phases include injection, combustion, expansion, and cooling. Each phase represents a critical part of the cycle where specific actions take place to achieve efficient combustion and power generation.

During the injection phase, fuel is injected directly into the combustion chamber, allowing for better atomization and mixing with the air. The combustion phase follows, where the fuel mixes with air and ignites, leading to rapid combustion. This process releases a significant amount of energy, resulting in the expansion phase where the gases produced from combustion push the piston down, converting chemical energy into mechanical work.

Finally, the cooling phase occurs as the cycle prepares to exhaust the spent gases for the next cycle. This phase ensures that the system operates within optimal temperature limits for efficiency and performance. Understanding these phases is critical for diagnosing and optimizing engine performance, particularly in systems that utilize direct fuel injection technology.