Abstract: The invention relates to a method for the operational analysis of an engine and/or for calibrating a controller of the engine, in particular an internal combustion engine, wherein run-up occurs of test points defined by values of a plurality of predetermined operating parameters and selected from a multidimensional test space using a statistical experiment design, whereby at least one operating parameter is in each case changed from one test point to the next test point in a plurality of steps in the run-up of the test points, wherein operational measurements are performed at measurement points resulting from a respective increment and at the actual test points, whereby measurement data from the operational measurements for the analysis and calibration of the controller are output and continuously stored, as well as a corresponding system.

Abstract: An internal combustion engine comprising a variable valve lift system whereby the engine can operate selectively in either of at least two valve lift modes, and a variable valve timing system, as well as a method for controlling valve lift shifting in such an engine are disclosed. The method comprises controlling the variable valve timing system so as to reduce the difference between two of the valve lift modes regarding the output torque of the engine.