Patent · US Active

Correction of counting errors in the evaluation of current ripples in a DC motor

US8310185B2 · kind B2 · utility

4Cited by

1References

10Claims

0Family size

Assignee

BROSE FAHRZEUGTEILE GMBH & CO. · DE

Inventors

Jovan Knezevic · Munich, DE
Wolfgang Uebel · Weitramsdorf, DE

Key dates

Filing date	Sep 16, 2011
Grant date	Nov 13, 2012
Priority date	—
Expiry date	Sep 16, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH02P7/03
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method for detecting a regulating variable of a mechanically commutated DC motor in a positioning device for a motor vehicle is provided. The DC motor has a standard ripple pattern, which contains per engine cycle or semi-cycle at least one index ripple, which is classified with regard to amplitude, duration and/or time position. The counter-electromotoric power is calculated from a measured motor current and the measured motor voltage by a motor model. An alternating element corresponding to the current ripples is extracted from the counter-electromotoric power, which in turn is used to determine the current ripples. Further, in at least one engine cycle or engine semi-cycle the index ripple is identified and the total identified current ripples are counted. The result of the count is hereby corrected when the index ripple is not counted at the expected position.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.