| 摘要 |
PROBLEM TO BE SOLVED: To keep an air-fuel ratio even in a transient time of control when a target rotating speed of a fan is changed, in controlling the air-fuel ratio of a gas burner in which an amount of supply air is controlled by controlling a rotating speed of the fan.SOLUTION: A gas pressure supplied to a gas burner 120 is controlled on the basis of an opening of a gas proportional valve 200, and an amount of air supplied to the gas burner 120 is controlled on the basis of a rotating speed of a combustion fan 160. A command gas pressure for controlling the opening of the gas proportional valve 200 is determined by correcting an ideal gas pressure to achieve a prescribed air fuel ratio to the amount of air on the basis of the detected rotating speed of the combustion fan 160, according to a deviation between a final target gas pressure corresponding to a target heat generation amount and the ideal gas pressure in the gas burner 120. |
