Method for operating a heating device, computer program, regulating and control device and heating device

The method uses sensor derivatives and threshold comparisons to enhance flame monitoring in heating appliances, addressing reliability and complexity issues, enabling robust detection of flame loss and flashback without structural changes.

EP4462021B1Active Publication Date: 2026-04-22VAILLANT GMBH(DE)
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Patents
Current Assignee / Owner
VAILLANT GMBH(DE)
Filing Date
2024-05-06
Publication Date
2026-04-22

AI Technical Summary

Technical Problem

Existing flame monitoring methods in heating appliances, particularly those using hydrogen, are inadequate for reliably distinguishing between flame loss and normal power output reductions, and are often complex or require significant structural changes.

Method used

A method involving first and second derivatives of sensor signals, combined with threshold comparisons, to detect flame loss and impending flashback, using UV and temperature sensors, without requiring structural modifications.

Benefits of technology

Enables reliable detection of flame loss and early identification of flashback across the modulation range, enhancing monitoring robustness and simplicity of implementation.

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Abstract

A method is proposed for operating a heating appliance (1) comprising flame monitoring for a burner (3) of the heating appliance (1) with at least one sensor (15), wherein a reference value is calculated based on a first derivative and a second derivative of the signal (18) of the sensor (15), and a flame state (23) is determined by comparing the first reference value with a first predetermined threshold, and / or the at least one sensor (15) is a UV sensor, and a first derivative of the signal (18) of the sensor (15) is compared with a second predetermined threshold, and the signal of the sensor (15) is compared with a third predetermined threshold, and a flame state (23) is determined. Determining the flame state (23) can, in particular, include detecting a flame flashback and / or a flame loss.
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