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Internal Combustion Engine with Cylinders that can be De-Activated, with Exhaust Gas Recirculation by Variable Control of the Intake Valves, and Method for Controlling an Internal Combustion Engine

  • US 20110313643A1
  • Filed: 05/05/2011
  • Published: 12/22/2011
  • Est. Priority Date: 06/18/2010
  • Status: Active Grant
First Claim
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1. Multi-cylinder internal combustion engine, comprising:

  • at least one intake valve for each cylinder of a plurality of cylinders of the engine,actuator means for the at least one intake valve suitable to vary the time and/or the opening stroke of the at least one intake valve of each cylinder depending on the operating conditions of the engine, and independently from the at least one intake valve of each other cylinder of the plurality of cylinders,electronic control means for controlling said actuator means and for controlling the supply of fuel to the plurality of cylinders of the engine,said electronic control means programmed for;

    deactivating at least one deactivated cylinder of the cylinders of the engine by cutting off fuel supply to said at least one deactivated cylinder of the plurality of cylinders, under operating conditions that do not require the maximum power of the engine and in which one wants to reduce fuel consumption,keeping the intake valves of the at least one deactivated cylinder at least partly open during at least one part of the discharge stage in each deactivated cylinder of the at least one deactivated cylinder, in the abovementioned operating conditions with the at least one deactivated cylinder, so that in the at least one deactivated cylinder part of the burnt gases generated during the operation prior to the deactivation flows into the respective intake conduits during the discharge stage of each cylinder of the at least one deactivated cylinder,keeping the intake valves of the at least one deactivated cylinder closed after the discharge stage in each deactivated cylinder of the at least one deactivated cylinder, as soon as—

    with the subsequent intake stage—

    the burnt gases left in the respective intake conduit return into the cylinder, and before any substantial amount of fresh air starts getting into the cylinder,keeping said intake valves of the at least one deactivated cylinder closed during the compression and expansion stages in each deactivated cylinder of the at least one deactivated cylinder, over the duration of the deactivation condition.

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