Patent · US Expired

Method for determining a mass airflow

US6999882B2 · kind B2 · utility

24Cited by

6References

14Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Werner Frie · Uttenreuth, DE
Christoph Haberer · Hetzendorf, AT
Harald Liederer · Nieheim, DE

Key dates

Filing date	Jul 28, 2003
Grant date	Feb 14, 2006
Priority date	—
Expiry date	Sep 3, 2023

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02D2041/288
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

In a method for determining a mass airflow in an air duct using a mass airflow sensor, sensor signals at successive times, indicating the magnitude of the mass airflow, are captured and, using a characteristic curve for the mass airflow sensor, corresponding values are determined for the mass airflow. In doing so, a time series of signals is subjected to a vibration analysis, which determines a fundamental vibration and at least one prescribed harmonic vibration of the fundamental vibration, and the existence of a backflow is established if the ratio of the strength of the harmonic vibration to the strength of the fundamental vibration exceeds a prescribed threshold value.

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