An electronic multi-point injection gasoline system and a mechanical multi- point diesel rotary fuel injection system are applied to the intake of a standard 4-stroke pre-chamber automotive diesel engine to obtain a hybrid combustion.
Hybrid combustion is characterized varying the engine work conditions, principally, the homogeneous and heterogeneous charge relation, the fuel properties (different diesel and gasoline mixtures), the engine speed, the torque and the cooling system temperature.
Three different kinds of hybrid combustion have been found and defined: the self-ignition hybridization, the mixture hybridization of advance and the mixture hybridization of delay.
Every kind of hybrid combustion can be modified in different ways, to reduce the combustion noise, the NOx generation, the particles emission or to improve the fuel ratio.
The heterogeneous combustion modification can be controlled by three principal parameters, the hybridization fuel properties, the hybridization fuel percentage and the time and among of main fuel injection.