Control System And Method For A Solid Fuel Combustion Appliance
AssigneeMaxitrol Company
InventorMark Geoffrey Masen
Life of this patent
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Abstract
Techniques for controlling a solid fuel combustion appliance, e.g., a wood burning stove, are disclosed. A control system measures an exhaust gas temperature of airflow through an outlet of the solid fuel combustion appliance. The control system determines a derivative of the exhaust gas temperature with respect to time. The derivative of the exhaust gas temperature with respect to time is compared to a predetermined threshold. The control system modulates the inlet damper in response to determining that the derivative of the exhaust gas temperature with respect to time reaches the predetermined threshold.
Claims13
1-3. (canceled)
A solid fuel combustion appliance including a housing defining a combustion chamber, an inlet, an outlet, and an opening, the solid fuel combustion appliance comprising:
- an inlet damper movable between a plurality of positions and being configured to control airflow into said inlet;
- a drive mechanism operatively coupled to said inlet damper and being configured to control positions of said inlet damper;
- a controller in communication with said drive mechanism and being configured to control operation of said drive mechanism;
- an exhaust temperature sensor coupled to said controller and being configured to produce measurements of an exhaust gas temperature of airflow through said outlet;
- and
- wherein said controller is configured to:
- receive measurements from said exhaust temperature sensor;
- determine a derivative of the exhaust gas temperature with respect to time;
- determine whether a predetermined time is specified to maintain the inlet damper at a predetermined position;
- compare the derivative of the exhaust gas temperature with respect to time to a predetermined threshold;
- and
- modulate said inlet damper in response to determining that the derivative of the exhaust gas temperature with respect to time reaches the predetermined threshold.
A solid fuel combustion appliance including a housing defining a combustion chamber, an inlet, an outlet, and an opening, the solid fuel combustion appliance comprising:
- an inlet damper movable between a plurality of positions and being configured to control airflow into said inlet;
- a drive mechanism operatively coupled to said inlet damper and being configured to control positions of said inlet damper;
- a controller in communication with said drive mechanism and being configured to control operation of said drive mechanism;
- an exhaust temperature sensor coupled to said controller and being configured to produce measurements of an exhaust gas temperature of airflow through said outlet;
- and
- wherein said controller is configured to:
- receive measurements from said exhaust temperature sensor;
- determine a derivative of the exhaust gas temperature with respect to time;
- compare the derivative of the exhaust gas temperature with respect to time to a predetermined threshold;
- indefinitely determine the derivative until the derivative of the exhaust gas temperature with respect to time reaches the predetermined threshold;
- and
- modulate said inlet damper in response to determining that the derivative of the exhaust gas temperature with respect to time reaches the predetermined threshold.
A solid fuel combustion appliance including a housing defining a combustion chamber, an inlet, an outlet, and an opening, the solid fuel combustion appliance comprising:
- an inlet damper movable between a plurality of positions and being configured to control airflow into said inlet;
- a drive mechanism operatively coupled to said inlet damper and being configured to control positions of said inlet damper;
- a controller in communication with said drive mechanism and being configured to control operation of said drive mechanism;
- an exhaust temperature sensor coupled to said controller and being configured to produce measurements of an exhaust gas temperature of airflow through said outlet;
- and
- wherein said controller is configured to:
- receive measurements from said exhaust temperature sensor;
- determine a derivative of the exhaust gas temperature with respect to time;
- compare the derivative of the exhaust gas temperature with respect to time to a predetermined threshold;
- indefinitely determine the derivative until the derivative of the exhaust gas temperature with respect to time reaches the predetermined threshold;
- and
- modulate the inlet damper in response to selecting one of a plurality of operation modes, wherein the plurality of operation modes specifies a set point for the exhaust gas temperature.
Dependencies are inferred from the claim text.