Method for controlling a clearing process in a vacuum cleaning device, and vacuum cleaning device

Patent metadata

Field	Value
Publication number	US-12357141-B2
Application number	US-202017442851-A
Country	US
Kind code	B2
Filing date	Apr 9, 2020
Priority date	Apr 23, 2019
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

A method for controlling a clearing process in a vacuum cleaning device, wherein the vacuum cleaning device comprises at least one filter, which is cleared regularly. The method proposed allows, in particular, differential-pressure-dependent filter clearing in accordance with requirements, during which filter aging and/or filter wear can also be taken into account. In a second aspect, the invention relates to a vacuum cleaning device by means of which the proposed control method can be carried out. For this purpose, the vacuum cleaning device can comprise, in particular, a filter clearing unit.

First claim

What is claimed is:

1. A method for controlling a clearing process in a vacuum cleaning device, the vacuum cleaning device comprising at least one filter, the filter being cleared regularly, the method comprising:
stipulating a first reference value for at least one filter clearing process, the first reference value being used to define a defined pressure range, a first differential pressure value for qualitatively acceptable filter clearing being in the defined pressure range so that the defined pressure range includes the first differential pressure value;
operating the vacuum cleaning device and clearing the filter using the at least one filter clearing process with the first reference value as a target value for the clearing, and thereafter obtaining a current state differential pressure value describing a current state of the filter by forming a difference between pressure values detected in a flow of the vacuum cleaning device upstream and downstream of the filter;
determining whether the current state differential pressure value is in the defined pressure range; and
when the current state differential pressure is within the defined pressure range, operating the vacuum cleaning device and keeping the first reference value for at least one subsequent filter clearing process with the first reference value as the target value; and
when the current state differential pressure is outside the defined pressure range, operating the vacuum cleaning device and stipulating a second reference value for at least one further subsequent filter clearing process to account for filter aging and performing the at least one further subsequent filter clearing process using the second reference value as a second target value.

2. The method as recited in claim 1 wherein the second reference value is stipulated as the obtained pressure value and is greater than the first reference value.

3. The method as recited in claim 1 wherein the second reference value can be stipulated as the obtained differential pressure value and less than the first reference value when a filter clearing process results in a lower degree of contamination after a first filter clearing process.

4. The method as recited in claim 1 wherein the flow is an extraction flow of the vacuum cleaning device.

5. The method as recited in claim 1 wherein the first reference value is situated centrally in the defined pressure range.

6. The method as recited in claim 1 wherein the first reference value represents an upper limit of the defined pressure range.

7. The method as recited in claim 6 wherein a lower limit of the defined pressure range is bounded by a threshold value.

8. The method as recited in claim 1 wherein the first reference value represents a lower limit of the defined pressure range.

9. The method as recited in claim 8 wherein an upper limit of the pressure range is bounded by a threshold value.

10. A vacuum cleaning device comprising: a filter, and a controller configured to initiate and carry out a filter cleaning of the vacuum cleaning device by the method as recited in claim 1 .

11. The vacuum cleaning device as recited in claim 10 further comprising sensors for obtaining pressure values, wherein the sensors are arranged in an extraction flow of the vacuum cleaning device upstream and downstream of the filter.

Assignees

• Hilti Ag

Inventors

• Hanslmeier Xaver
• Müller Svenja
• Stahl Rainer
• Wenning Dominik

Classifications

• A47L9/2821

  Pressure, vacuum level or airflow · CPC title

• A47L9/20 Primary

  Means for cleaning filters · CPC title

• A47L9/19 Primary

  Means for monitoring filtering operation · CPC title