Volvo Truck Corporation

David Carlson

Staffan Lundgren

Arne Andersson

Claes Kuylenstierna

The present invention relates to a method for controlling an internal combustion engine arrangement (). The internal combustion engine arrangement () comprises a combustion cylinder () and an inlet valve () arranged to be positioned in a closed position at a distance before a piston () reaches a bottom dead center during normal operation. The inlet valve is further controllable to be arranged in the open position until the piston reaches the bottom dead center if a required volumetric efficiency of the combustion cylinder is higher than a volumetric efficiency during normal operation.

Method for controlling an internal combustion engine arrangement

The invention relates to a system () for operating a valve of an internal combustion engine (), said system comprising a primary fluid circuit () configured to define a fluid passageway for circulating a compressible fluid medium there through being operatively connectable to an actuator () of an actuated flow control valve () of said internal combustion engine, thereby capable of delivering a valve opening force. The system further comprises: a secondary fluid circuit () configured to define a secondary fluid passageway for transporting a compressed fluid medium, and having an inlet passage () connectable to a cylinder for receiving the compressed fluid medium; and an auxiliary pressurized system () comprising a chamber () and at least one reciprocating member () operable in said chamber (), said auxiliary pressurized system () being arranged in fluid communication with said secondary fluid circuit () and in fluid communication with said primary fluid circuit such that said at least one reciprocating member () pressurizes said primary fluid circuit when said compressed fluid medium of the secondary fluid circuit acts on said at least one reciprocating member ().

Pneumatic system for an internal combustion engine

The invention relates to a method () for estimating a cylinder pressure (CP) in an internal combustion engine arrangement (), the method comprising the steps of: initiating () an opening of a valve by an actuator during an expansion stroke; monitoring () the valve to determine a point in time (Tp) when the valve opens; determining () a differential pressure (DP) between the combustion cylinder and a position in a fluid medium exhaust passage () downstream said valve at the point in time (Tp); receiving () data being indicative of a pressure (EP) in the fluid medium passage at the point in time (Tp); and determining () the cylinder pressure (CP) at the point in time (Tp) based on the determined differential pressure (DP) and the data indicative of the pressure in said fluid medium passage.

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Mölndal, Sweden

David Carlson