Device for the detection of the clogging of an air filter
US5429649A · kind A · utility
Inventor
Key dates
| Filing date | Apr 13, 1993 |
| Grant date | Jul 4, 1995 |
| Priority date | — |
| Expiry date | Apr 13, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P13/0066
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A device for the detection of an air filter having an auxiliary air duct opening upstream and downstream of the air filter so as to generate in the auxiliary duct an air flow due to the head loss of the air filter and having a velocity varying in accordance with the head loss; and an electronic circuit delivering from the signals of first and second sensing devices, a signal representative of a limit clogging of the air filter when the air flow speeds within a main duct and the auxiliary duct are differing by a determined value corresponding to a limit head loss of the air filter, the device being applicable to air conditioning equipments fitting automotive vehicles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.