| 摘要 |
PURPOSE:To previously control fluctuation in a fuel flow rate, by timely transmitting a compensating signal which offsets a portion of fluctuation in the fuel flow rate to a fuel controlling valve in accordance with the timing of opening and closing a valve at the inlet of a burner when the burner is ignited and extinguished. CONSTITUTION:When an opening command 16 is given to a valve at the inlet of a burner, a timer 18 starts counting the time which corresponds to the total amount of the open time (T) of a valve 11 at the inlet of a burner and a feedback restoring time 27. After that a correction signal is allowed to be released from a correction signal generator 20. The correction signal is added to a fuel controlling signal which is an output from a PI controller 13, passing through an analog switch 21, a signal rate controller 22, an uppermost and lowermost bounds setter 23, and adders 36 and 37. Since the correction signal 25 has an entirely reverse wave-form to the wave-form of fluctuation in the fuel flow rate 24, the fluctuation produced at the time of ignition is previously offset, so that the fluctuation in the fuel rate at the time of ignition can be controlled. The fluctuation in the fuel flow rate at the time of extinguishment is also previously offset by the reverse action to the above-mentioned action. |
