In general, the user has to develop a function f(x), which is the second derivative of the valve train lift function S(x). The searched valve lift curve is calculated by integrating f(x) twice, whereas a special attention is turned to the ramps. The user has to define the length and the shape of the ramps and the integration algorithm automatically updates the related splines nodes so that a desired ramp height is achieved. The compensation of the areas in the acceleration curve is done online during the adjustment of the spline nodes. This compensation is a necessary condition that the valve lift reaches the zero position after the valve opening phase. Necessary and sufficient to achieve this condition is a compensation of the curve areas in the first integral. The user can control this condition with a pointer instrument, displayed on the lower right hand side of the screen, while interactively moving the spline nodes and thus adjusting the acceleration characteristic of the valve to his needs.