Hydrogen Hybrid

The Quasiturbine in Beau de Rocha (Otto) cycle is a relatively simple technology which could be widely used within a few years with substantial efficiency benefits over piston engines in many applications. Large utility plants convert energy more efficiently than small distributed units and should be favored when possible, but on the long term, the Quasiturbine detonation engine is one of the very few means to match utility efficiency the distributed way, while being as chemically clean as possible.  Go to site of origin

Not only the photo-detonation suppresses the energy consuming butterfly vacuum intake valve and so preserving the engine efficiency at low power, but since it requires a much higher compression ratio, it does increases the engine efficiency at full throttle as well.