Patent ID: 8513909
Filing Date: 2013-08-20
Classification: G05B,H02P

Abstract:
1. A method for processing at least one motor variable of a mechanically commutated DC motor being supplied by an on-board electrical system DC voltage, of an actuating device for a motor vehicle, which comprises the steps of: detecting an armature current and a motor voltage of the mechanically commutated DC motor; determining an actuating position of an actuating element from a time profile of the armature current by counting current ripples contained therein; during an initial phase in which the mechanically commutated DC motor is supplied with current, mapping the armature current, which increases over time, by a function determined from pairs of values, which are detected in a time interval, of the motor voltage and of the armature current and extrapolating a current value of the armature current which can be expected at a later time therefrom; and starting a ripple count for detecting the current ripples, including a first current ripple being generated when the mechanically commutated DC motor is started up, in an event of a deviation in the armature current, which is detected at the later time, from an extrapolated armature current.