Patent ID: 8887560
Filing Date: 2014-11-18
Classification: F02D,F02M

Abstract:
1. A method for determining a duration for electric actuation of a valve comprising a coil drive, in particular of a direct injection valve for an internal combustion engine, the method comprising: deactivating a current flow through a coil of the coil drive such that the coil is rendered currentless, detecting a time profile of a voltage induced in the currentless coil, calculating a time derivative of the detected voltage profile induced in the currentless coil, calculating or accessing a time derivative of a reference voltage profile, calculating a difference between the time derivative of the detected voltage profile and the time derivative of the reference voltage profile, determining a closing time of the valve based on the calculated difference between the time derivative of the detected time profile and the time derivative of the reference voltage profile, and determining a duration of an electric actuation of the valve for a future injection process based on the determined closing time.