Method for identifying combined piston stroke phase difference, intake valve stroke phase difference and exhaust valve phase difference of an internal combustion engine

摘要

A method for identifying a combination of piston stroke phase difference, intake valve phase difference, and exhaust valve phase difference of a cylinder of an internal combustion engine, wherein the intake air and / or exhaust gas outflow path in an air suction path is assignable to the cylinder. The dynamic pressure oscillations of the exhaust gas within are measured during operation, and based on the phase position of the selected signal frequency of the measured pressure oscillations, a line with the same phase position is obtained, and a common intersection point by projection and phase shift From this, the intake valve stroke phase difference, the exhaust valve stroke phase difference, and the piston stroke phase difference are determined. Thereby, particularly accurate identification of the control time can be performed easily and at low cost. This improves the benefits regarding exhaust, fuel consumption, quietness and performance during operation, as well as engine closed-loop controllability and open-loop control.