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Method and device for detecting the state of an air filter in a heating and/or air-conditioning installation of an automobile

  • US 6,107,923 A
  • Filed: 10/06/1998
  • Issued: 08/22/2000
  • Est. Priority Date: 10/07/1997
  • Status: Expired due to Term
First Claim
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1. A method of detecting the state of an air filter in a ventilation system of a passenger compartment of an automobile, comprising:

  • putting the system into a given mode of ventilation;

    measuring a value of a parameter of a flow of air emitted by a ventilator nozzle located in the passenger compartment; and

    comparing the measured value with a reference value to determine whether the filter needs replacing.

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