Device and method for detecting filter clogging
US11358085B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2018 |
| Grant date | Jun 14, 2022 |
| Priority date | — |
| Expiry date | Oct 25, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S116/25
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present disclosure relates to a device and to a method for detecting filter soiling of a filter system having at least an air filter installed in an air duct and an electrically controlled fan for producing an air flow in the air duct, wherein the device comprises at least a motor controller for controlling the fan motor by means of PWM control and an evaluating apparatus for determining the actual rotational speed (ni) of the fan in accordance with the actual degree of modulation (Ti) of the motor current for achieving the present rotational speed (ni), wherein, in the evaluating apparatus, setpoint value pairs (nsetpoint, Tsetpoint) for the setpoint rotational speed (nsetpoint) at a certain degree of modulation (Tsetpoint) are also stored, as well as a comparator in order to compare the actual value pairs (ni, Ti) with the setpoint value pairs (nsetpoint, Tsetpoint) and to obtain the degree of filter soiling of the air filter therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.