Intelligent oxygen level controller for biofuel-fired burner

A method for controlling a bio-fuel fire, the method comprising:

• providing a bio-fuel fire control system that includes:
• a first port configured to be coupled to a first oxygen level sensor disposed upstream of a catalytic pollution control device;
• a second port configured to be coupled to a second oxygen level sensor disposed downstream of the catalytic pollution control device;
• a third port configured to be coupled to an air handler that supplies air to the bio-fuel fire;
• and
• a controller coupled to the first, second and third ports;
• repeatedly receiving, via the first and second ports, respective first and second signals indicating first and second amounts of oxygen in exhaust gas from a bio-fuel fire, thereby receiving a series of first and second oxygen level samples;
• for each first and second oxygen level sample:
• comparing, by the controller, the first oxygen level sample to a first predetermined value;
• if, as a result of the comparing, the first oxygen level sample is found to be less than the first predetermined value, generating, by the controller, a first control signal configured to cause the air handler to increase a rate at which the air handler supplies air to the bio-fuel fire;
• comparing, by the controller, the second oxygen level sample to a second predetermined value, less than the first predetermined value;
• if, as a result of the comparing, the second oxygen level sample is found to be less than the second predetermined value, generating, by the controller, the first control signal;
• and
• if the first control signal is generated:
• sending, via the third port, the generated first control signal to the air handler;
• and
• in response to the generated first control signal, increasing, by the air handler, the rate at which air is supplied to the bio-fuel fire.