How does VW's Budack engine cycle work?

Volkswagen's new Budack engine cycleVolkswagen isn't reinventing the way your internal combustion engine works. The automaker has, however, created a new twist on the Otto cycle that's a revised version of the Atkinson cycle. Your standard Otto cycle is the one with which you're most familiar. It's made up of intake, compression, combustion, and exhaust. The Atkinson version of this...

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