Method for controlling an internal combustion engine arrangement
AssigneeVolvo Truck Corporation
InventorsArne Andersson, David Carlson
Life of this patent
Estimating the term…
Abstract
The present invention relates to a method for controlling an internal combustion engine arrangement (100). The internal combustion engine arrangement (100) comprises a combustion cylinder (102) and an inlet valve (106) arranged to be positioned in a closed position at a distance before a piston (104) 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.
Claims13
A method for controlling an internal combustion engine arrangement, the internal combustion engine arrangement comprising
- a combustion cylinder housing a reciprocating piston movable between a bottom dead center and a top dead center within the combustion cylinder;
- an inlet valve operable between an open position and a closed position for controlling a flow of air into the combustion cylinder;
- a controllable inlet cam shaft connected to the inlet valve, the inlet cam shaft being arranged to, during normal operation of the internal combustion engine arrangement, position the inlet valve from the closed position to the open position when the piston reaches the top dead center, and to position the inlet valve in the closed position at a predetermined crank angle degree before the piston reaches the bottom dead center;
- and
- a cam phaser connected to the inlet cam shaft, the cam phaser being arranged for variably controlling valve timing of the inlet valve, the method comprising the steps of:
- receiving a signal indicative of an operating mode of the internal combustion engine arrangement;
- determining a required volumetric efficiency of the combustion cylinder for operating the internal combustion engine arrangement in the operating mode;
- and
- if the required volumetric efficiency is higher than a volumetric efficiency of the combustion cylinder during the normal operation of the internal combustion engine arrangement:
- controlling, using the cam phaser connected to the inlet cam shaft, the inlet valve to be arranged in the open position at a number of crank angle degrees after the piston has left the top dead center, the number of crank angle degrees after the piston has left the top dead center corresponds to the predetermined crank angle degree from the bottom dead center when the inlet valve is closed during the normal operation of the internal combustion engine arrangement, and
- maintaining the inlet valve in the open position until the piston reaches the bottom dead center.
An internal combustion engine arrangement comprising a combustion cylinder housing a reciprocating piston movable between a bottom dead center and a top dead center within the combustion cylinder;
- an inlet valve operable between an open and a closed position for controlling a flow of air into the combustion cylinder;
- a controllable inlet cam shaft connected to the inlet valve, the inlet cam shaft being arranged to, during normal operation of the internal combustion engine arrangement, position the inlet valve from the closed position to the open position when the piston reaches the top dead center, and to position the inlet valve in the closed position at a predetermined crank angle degree before the piston reaches the bottom dead center;
- and a cam phaser connected to the inlet cam shaft, the cam phaser being arranged for variably controlling valve timing of the inlet valve, wherein the internal combustion engine arrangement further comprises a control unit configured to:
- receive a signal indicative of an operating mode of the internal combustion engine arrangement;
- determine a required volumetric efficiency of the combustion cylinder for operating the internal combustion engine arrangement in the operating mode;
- and
- if the required volumetric efficiency is higher than a volumetric efficiency of the combustion cylinder during the normal operation of the internal combustion engine arrangement, the control unit is further configured to:
- control the cam phaser connected to the inlet cam shaft to open the inlet valve at a number of crank angle degrees after the top dead center, the number of crank angle degrees after the piston has left the top dead center corresponds to the predetermined crank angle degree from the bottom dead center when the inlet valve is closed during the normal operation of the internal combustion engine arrangement, and
- maintain the inlet valve in the open position until the piston reaches the bottom dead center.
Dependencies are inferred from the claim text.