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Method and device for monitoring the service life of a filter

  • US 20030052791A1
  • Filed: 08/09/2002
  • Published: 03/20/2003
  • Est. Priority Date: 08/17/2001
  • Status: Active Grant
First Claim
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1. A method of monitoring the service life of a filter (1) in a filter system equipped with a fan, for example in a heating and air conditioning system of a motor vehicle, comprising:

  • measuring the instantaneous air speed (21) using a sensor (2, 20) downstream from the filter (1), comparing it to the reference air speed (R) from the unloaded filter (1), and transmitting it to a service computer or indicating it on a display, wherein the need to replace the filter is signaled when this value drops below a predetermined threshold or threshold range of the instantaneous air speed (21).

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