Patent ID: 7058538
Filing Date: 2006-06-06
Classification: F02D

Abstract:
1. Method for determining the instant of reaching of a stroke end position in a deactivation phase of a movable element acting as a shutter and being part of a solenoid electro-valve, wherein it comprises the following steps: a) assessment of nominal deactivation time and deduction from said time of the assessed instant in which the deactivated shutter reaches the stroke end position, b) application of an appreciable current flow through the solenoid during shutter motion, after solenoid deactivation, adjusted in a time range comprising the assessed nominal deactivation instant, c) acquisition of a convenient number of current samples, d) identification of two interpolation curves for acquired data, which approximate the development of the samples acquired before and after the instant in which the shutter reaches the stroke end, respectively, e) determination of the intersection point of said interpolation curves, from which the intersection instant can be inferred, f) identification of shutter stroke end instant with said intersection instant.