SYSTEMS AND METHODS FOR DETECTING THE STATUS OF A PARTICLE FILTER

1 . A monitoring device for monitoring an air cleaning system for determining when a particle filter of the air cleaning system needs cleaning or replacement, wherein the monitoring device comprises a remote monitoring device which is for application to the air cleaning system when a periodic monitoring function is to be performed and for removal from the air cleaning system between periodic monitoring functions, wherein the monitoring device comprises:

a microphone adapted to capture sounds of the air cleaning system during use and generating microphone signals;

a processor adapted to process the microphone signals and for monitoring changes in the microphone signals over time; and

an output device adapted to provide information relating to the particle filter status based on evolution of the microphone signals.

2 . The monitoring device as claimed in claim 1 , wherein the monitoring device is for application at a specific monitoring location of the air cleaning system or for positioning at the specific monitoring location relative to the air cleaning system.

3 . The monitoring device as claimed in claim 2 , wherein the specific monitoring location of the air cleaning system is in a vicinity of an air outlet.

4 . The monitoring device as claimed in claim 1 , wherein the processor is adapted to operate a machine learning algorithm.

5 . The monitoring device as claimed in claim 1 , comprises a smartphone or a tablet.

6 . An air cleaning system, comprising:

an air inlet;

a particle filter;

a fan for driving air through the particle filter; and

an air outlet,

wherein the air cleaning system further comprises a docking area configured as a monitoring location to which the monitoring device of claim 1 is applied, for performing the periodic monitoring function of the air cleaning system, thereby providing information relating to the particle filter status based on the evolution of the sound generated at the docking area.

7 . The air cleaning system as claimed in claim 6 , wherein the docking area is in a vicinity of the air outlet.

8 . The air cleaning system as claimed in claim 6 , further comprising software for loading on a smartphone or a tablet thereby to implement a remote monitoring device.

9 . A method for monitoring an air cleaning system for determining when a particle filter of the air cleaning system needs cleaning or replacement, comprising:

applying a remote monitoring device to the air cleaning system or positioning the remote monitoring device relative to the air cleaning system thereby to perform a periodic monitoring function;

wherein during the periodic monitoring function:

capturing sounds of the air cleaning system during use using a microphone and generating microphone signals; and

processing the microphone signals and monitoring changes in the microphone signals over time;

providing information relating to the particle filter status based on evolution of the microphone signals; and

removing the remote monitoring device from the air cleaning system between the periodic monitoring functions.

10 . The method as claimed in claim 9 , comprising applying the monitoring device to a specific monitoring location of the air cleaning system for the periodic monitoring.

11 . The method as claimed in claim 10 , wherein the specific monitoring location of the air cleaning system is in a vicinity of an air outlet.

12 . The method as claimed in claim 9 , comprising training and operating a machine learning algorithm to enable information relating to the particle filter status to be provided based on the evolution of the microphone signals.

13 . A computer program comprising computer program code means which is adapted, when said computer program code is run on a computer, to implement the steps in the method of claim 9 of processing the microphone signals and monitoring changes in the microphone signals over time and providing information relating to the particle filter status based on the evolution of the microphone signals.