Combined crankcase and canister ventilation system

A supercharged combustion engine, the engine comprising:

• a cylinder block,
• a cylinder head,
• a crankcase containing oil,
• an induction air conduit communicating with intake conduits in the cylinder head, the induction air conduit being connected to a supercharging unit and is provided with a throttle valve downstream of said supercharging unit,
• a first evacuation conduit connecting the crankcase with the induction air conduit at a point downstream of the throttle valve for evacuation of blow-by gases from the crankcase,
• a second evacuation conduit connecting the crankcase with the induction air conduit at a point on the intake side of the supercharging unit,
• wherein each evacuation conduit is provided with a valve arranged to limit or prevent the flow of gases from the induction air conduit towards the crankcase,
• a pressure regulator connecting the crankcase with said first and second evacuation conduits via a common conduit, said regulator being arranged to maintain a substantially constant pressure in the crankcase, and
• a device for separating oil from the evacuated blow-by gas,
• at least one further evacuation conduit arranged for ventilation of an emission source and being connected with said first and second evacuation conduits at a point between the pressure regulator and said valves, and
• additional evacuation conduits connected at the point where the common evacuation conduit, which is connected to the pressure regulator, branches into said first and second evacuation conduits.

A supercharged combustion engine comprising:

• a cylinder block, a cylinder head and a crankcase containing oil;
• an induction air conduit communicating with intake conduits in the cylinder head, said induction air conduit being connected to a supercharging unit and provided with a throttle valve downstream of said supercharging unit;
• a first evacuation conduit connecting the crankcase with the induction air conduit at a point downstream of the throttle valve for evacuation of blow-by gases from the crankcase;
• a second evacuation conduit connecting the crankcase with the induction air conduit at a point on an intake side of the supercharging unit;
• a pressure regulator connecting the crankcase with said first and second evacuation conduits via a common conduit, said regulator being arranged to maintain a substantially constant pressure in the crankcase;
• a separator configured to separate oil from the evacuated blow-by gas;
• said evacuation conduit is provided with a valve arranged to limit or prevent the flow of gases from the induction air conduit towards the crankcase;
• at least one additional evacuation conduit, arranged for ventilation of an emission source, is connected with said first and second evacuation conduits at a point between the pressure regulator and said valves;
• and
• an additional evacuation conduit connected between the pressure regulator and the point where the common evacuation conduit branches into said first and second evacuation conduits.

A supercharged combustion engine comprising:

• a cylinder block, a cylinder head and a crankcase containing oil;
• an induction air conduit communicating with intake conduits in the cylinder head, said induction air conduit being connected to a supercharging unit and provided with a throttle valve downstream of said supercharging unit;
• a first evacuation conduit connecting the crankcase with the induction air conduit at a point downstream of the throttle valve for evacuation of blow-by gases from the crankcase;
• a second evacuation conduit connecting the crankcase with the induction air conduit at a point on an intake side of the supercharging unit;
• a pressure regulator connecting the crankcase with said first and second evacuation conduits via a common conduit, said regulator being arranged to maintain a substantially constant pressure in the crankcase;
• a separator configured to separate oil from the evacuated blow-by gas;
• said evacuation conduit is provided with a valve arranged to limit or prevent the flow of gases from the induction air conduit towards the crankcase;
• at least one additional evacuation conduit, arranged for ventilation of an emission source, is connected with said first and second evacuation conduits at a point between the pressure regulator and said valves;
• and
• an additional evacuation conduit connected at the point where the common evacuation conduit, which is connected to the pressure regulator, branches into said first and second evacuation conduits.