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I think the mentioned patent solved a radically different problem related to the usual management strategy of the EGR valve.

I ment "it's a way of using the fly wheel's energy to keep the turbo spinning".

All that makes sense. When throttle is closed the dump valve is open, so the compressor virtually does not consume power. The intake pressure is very low. If at that moment EGR is open the engine starts sucking still hot gas from the exhaust. The compression work will heat them again, the...