| 摘要 |
PURPOSE:To make it possible to rapidly reach the preset number of revolutions of a fan by switching the control of the number of revolutions to the power control of a fan control power output means when an output manipulated variable for a combustion quantity adjustor is reduced, and by switching the power control to the control of the number of revolutions when the output manipulated variable is increased. CONSTITUTION:A combustion range comparison and judgement means 17 inputs an output manipulated variable PVset for a combustion quantity adjustor 3 and a first reference manipulated variable PVK1 as well as a second reference manipulated variable PVJ1, both of which are set in advance, and outputs a comparison and judgement signal CP upon comparing and judging these variables. An output switching means 18 performs a switching operation on the basis of the comparison and judgement signal CP and switches the fan control output Vc of a control means 19 for the number of revolutions, which controls a fan 4, and the fan control power Vc', outputted from a fan control power output means 15 so as to always keep the preset number of revolutions Nset in a constant state to output it to the fan 4. |
