Multi-cylinder diesel engine with variably actuated valves

摘要

In a Diesel engine with variably actuated valves, the control cam (9) of each inlet valve (V I ) is shaped so as to provoke the opening of the respective inlet valve (V I ) during the engine's normal exhaust phase to accomplish "internal" exhaust gas recirculation (EGR), i.e. EGR inside the engine, due to the fact that, during the normal exhaust phase, part of the exhaust gas (B A ) passes from the cylinder into the inlet port (I), and then returns to the cylinder during the next induction phase. The engine also comprises means for providing "external" EGR, i.e. EGR outside the engine, and the combination of internal EGR and external EGR is used to control the temperature of the charge induced into the cylinder.