Closed-loop programming and control of a combustion appliance

Patent metadata

Field	Value
Publication number	US-11073281-B2
Application number	US-201816032435-A
Country	US
Kind code	B2
Filing date	Jul 11, 2018
Priority date	Dec 29, 2017
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

Methods and systems for programming and controlling a control system of a gas valve assembly. The methods and systems include programming a control system in an automated manner to establish an air-fuel ratio based at least in part on a burner firing rate. The established air-fuel ratio may be configured to facilitate meeting a combustion constituent set point of combustion constituents in the combustion exhaust. The methods and systems include controlling operation of a combustion appliance based on closed-loop control techniques and utilizing feedback from a sensor measuring combustion constituents in exhaust from a combustion chamber in the combustion appliance. The combustion constituents on which control of the combustion appliance may be determined include oxygen and/or carbon dioxide.

First claim

What is claimed is:

1. An auto-programming control system for a combustion burner having a gas valve assembly and/or a fan that is controllable to provide a plurality of burner firing rates of the combustion burner, comprising:
a controller configured to control an air-fuel ratio of a fluid flow to the combustion burner by controlling the gas valve assembly to control an amount of fuel that is provided to the combustion burner and/or controlling a fan speed of the fan to control an amount of air that is provided to the combustion burner;
a memory in communication with the controller; and
wherein the controller is configured to control the gas valve assembly of the combustion burner to fire the combustion burner at each of the plurality of burner firing rates, and at each of the plurality of burner firing rates the controller is configured to:
set an initial air-fuel ratio setting;
receive from one or more combustion sensors a measure of a combustion constituent exiting a combustion chamber of the combustion burner at the initial air-fuel ratio setting;
determine a difference between the measure of the combustion constituent exiting the combustion chamber and a combustion constituent set point;
adjust the air-fuel ratio setting until the difference between the measure of the combustion constituent exiting the combustion chamber and the combustion constituent set point is below a threshold, and then save to the memory the adjusted air fuel ratio setting and an association between the adjusted air-fuel ratio setting and the corresponding one of the plurality of burner firing rates; and
move to a next burner firing rate of the plurality of burner firing rates and repeat.

2. The auto-programming control system of claim 1 , wherein adjusting the air-fuel setting comprises adjusting a valve position of the gas valve assembly, and wherein saving the association between the adjusted air fuel ratio setting and the corresponding one of the plurality of burner firing rates comprises saving an association between the valve position and the corresponding one of the plurality of burner firing rates.

3. The auto-programming control system of claim 1 , wherein adjusting the air-fuel ratio setting comprises adjusting the fan speed of the fan to control the amount of air that is provided to the combustion burner, and wherein saving the association between the adjusted air-fuel ratio setting and the corresponding one of the plurality of burner firing rates comprises saving an association between the fan speed and the corresponding one of the plurality of burner firing rates.

4. The auto-programming control system of claim 3 , further comprising:
a user interface in communication with the controller; and
wherein the controller is configured to identify a set of burner firing rates based on a user selection made via the user interface.

5. The auto-programming control system of claim 1 , wherein the measure of the combustion constituent comprises an oxygen concentration and/or a carbon dioxide concentration.

Assignees

• Honeywell Int Inc

Inventors

• Hazzard Frederick
• Bergum Glenn
• Graham Bernard

Classifications

• F23N2235/12

  Fuel valves · CPC title

• F23N2223/08

  Microprocessor; Microcomputer · CPC title

• F23N2900/05002

  Measuring CO2 content in flue gas · CPC title

• F23N2241/04

  Heating water · CPC title

• F23N5/242

  using electronic means · CPC title