Patent ID: 7963236
Filing Date: 2011-06-21
Classification: F23N

Abstract:
1. A method for controlling an air-fuel ratio of a boiler using an air pressure sensor, the method comprising: a first step of, when the boiler begins to operate on the basis of a user's setting, measuring an initial value of voltage of the air pressure sensor prior to operating a fan; a second step of determining whether or not the initial value of the air pressure sensor voltage measured in the first step corresponds to a standard initial reference voltage; a third step of, if the initial value of the air pressure sensor voltage prior to operating the fan corresponds to the standard initial reference voltage in the second step, performing a series of processes of controlling the air-fuel ratio without compensating for the initial value of the air pressure voltage; a fourth step of, if the initial value of the air pressure sensor voltage prior to operating the fan exceeds the standard initial reference voltage in the second step, compensating the initial value by an amount that corresponds to the amount that the initial value exceeds the standard initial reference voltage so as to maintain the initial value at the standard initial reference voltage and then performing a series of processes of controlling the air-fuel ratio using the air pressure sensor; and a fifth step of, if the initial value of the air pressure sensor voltage prior to operating the fan falls short of the standard initial reference voltage in the second step, compensating the initial value by an amount that corresponds to the amount that the initial value falls short of the standard initial reference voltage so as to maintain the initial value at the standard initial reference voltage and then performing a series of processes of controlling the air-fuel ratio using the air pressure sensor.