Abstract
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 an hybrid combustion. Hybrid combustion is characterised 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 has been found and defined: the self-ignition hybridisation, the mixture hybridisation of advance and the mixture hybridisation 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 principally parameters, the hybridisation fuel properties, the hybridisation fuel percentage and the time and among of main fuel injection.