A method of combined identification of intake valve lift phase difference and exhaust valve lift phase difference of an internal combustion engine by means of equal amplitude lines

摘要

In the method of combined identification of intake valve lift phase difference and exhaust valve lift phase difference of a cylinder of an internal combustion engine, cylinder-assignable dynamic pressure oscillations of the intake air in the air intake port and / or the exhaust gas in the exhaust gas exhaust passage are measured in operation and based on the Amplitudes selected signal frequencies of the measured pressure oscillations, lines of the same phase positions determined and brought by projection to a common point of intersection, from which the intake valve lift phase difference and the Auslassventilhub phase difference are determined. This makes it possible to perform a particularly accurate identification of the valve timing in a simple and cost-effective manner, whereby advantages in terms of emissions, consumption, smoothness and performance, and an improvement in the controllability and control of the engine can be achieved.