What are the differences between Miller cycle and Atkinson cycle?

[PhoebeLee]

The main difference between the Miller cycle and the Atkinson cycle lies in the size of the intake valve timing. The specific differences between the Miller cycle and the Atkinson cycle are as follows: 1. Different connecting rod mechanisms: The Miller cycle does not have complex connecting rod mechanisms. The Atkinson engine uses relatively complex connecting rods as power. 2. Different principles: The Atkinson cycle utilizes various mechanisms to change the piston's movement process, while the Miller cycle achieves this by delaying the closing of the intake valve. The Miller cycle changes the compression ratio by altering the timing of the intake valve closing. During the piston compression in the Miller cycle, the intake valve closing is delayed, allowing some of the air-fuel mixture that entered the cylinder during the intake process to flow back into the intake manifold, thereby changing the compression ratio.