Patent · US Expired

Method and device for monitoring the service life of a filter

US6894620B2 · kind B2 · utility

25Cited by

8References

17Claims

0Family size

Assignee

Carl Freudenberg KG · DE

Inventors

Heinz Reinhardt · Chadds Ford, US
Richard Borris · Heppenheim, DE
Christoph Malig · Erkelenz, DE

Key dates

Filing date	Aug 9, 2002
Grant date	May 17, 2005
Priority date	—
Expiry date	Aug 9, 2022

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB60H2003/0683
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A method of monitoring the service life of a filter (1) in a filter system equipped with a fan, in particular a filter (1) in an air conditioning system of a motor vehicle, the instantaneous air speed (21) preferably being measured on each startup of the system using a sensor (2, 20) downstream from the filter (1), compared to the reference air speed (R) from the unloaded filter (1), and transmitted to a service computer and/or indicated on a display, and the need to replace the filter being signaled when this value falls below a predetermined threshold or threshold range of the instantaneous air flow rate (21).

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