Patent ID: 7779798
Filing Date: 2010-08-24
Classification: F02D,Y02T

Abstract:
1. A method for determining a switchover condition in order to initiate a valve-lift changeover in an internal combustion engine, comprising an intake section and an exhaust section, at least one cylinder having a combustion chamber, a gas inlet valve and a gas outlet valve, by means of which a gas exchange between the intake section and the combustion chamber or the combustion chamber and the exhaust section is prevented when the gas inlet valve or the gas outlet valve is in a closed position and is otherwise enabled, a valve-lift adjustment device, by means of which a valve lift of the gas inlet valve and/or of the gas outlet valve can be adjusted, the method comprising the steps of: determining a torque requirement, determining an operating variable of the internal combustion engine, which operating variable is representative of an operating state of the internal combustion engine, depending on the operating variable, determining a time period which is needed in the current operating state in order to carry out at least one preparatory measure for the valve-lift changeover, determining a change value which is representative of a change in the torque requirement, and depending on the torque requirement, initiating the time period and the change value, the valve-lift changeover.