VERFAHREN ZUM VERÄNDERN DER VENTILSTEUERZEITEN EINER BRENNKR AFTMASCHINE

A technique is used for adjusting the valve timing of an internal combustion engine with a cam shaft and a cam lobe displaced at a rotational angle with respect to one another. Under interposition of a cam following element, such as, for example, a bucket tappet, the cam shaft and the cam lobe work together with intake or exhaust valves as well as the camshaft actuator present on the camshaft, through which the position and/or the attitude of rotation of the camshaft to the crankshaft can be changed. To decrease the valve opening time, the camshaft can be adjusted toward hate" during a valve stroke, while the camshaft is adjusted toward "early" during the immediately subsequent base circle phase of the affected camshaft. To increase the valve opening times the camshaft can be adjusted toward "early" during a valve stroke, while the camshaft is adjusted toward "late" during the immediately subsequent base circle phase of the affected camshaft. This technique permits adjustment of the angular attitude of the camshaft as well influence on the valve stroke curve.