Abstract
Turbocharging dramatically improves the power density of internal combustion engines both compression ignition and spark ignition. However, a standalone turbocharger suffers of transient and steady state downfalls when the energy to turbine is either smaller or larger than what would be needed by the compressor for the optimum engine operation of a specific point. Here we propose a super-turbocharger. The shaft of the turbocharger is connected to the crankshaft through gear pairs and a continuously variable transmission. Energy is drawn from the crankshaft, or delivered to the crankshaft, to better work in every operating point. This concept is here applied to a four-cylinders direct injection jet ignition engine. Every cylinder features one direct injector about the center of the cylinder, and one jet ignition device also about the center of the cylinder. The direct injector produces mixtures from stoichiometric homogeneous to lean stratified that are then efficiently ignited and rapidly burned by the jet ignitor.