| 摘要 |
PURPOSE:To permit quick and proper control, by a method wherein a difference between the amplitude signal of an optical power, obtained from flame, and the amplitude signal of the optical power corresponding to the proper percentage of O2 obtained previously from the flow rate of fuel is obtained and an output for eliminating the deviation is outputted to the control unit of the flow rate of combustion air. CONSTITUTION:A control unit 16 reads an optical power signal X0 from a converter 17 and obtains the average X of the movement of a total signal during DELTAt sec to obtain the absolute value Y0 of the difference, Then, the total sum of (n) pieces of data or the integral value Y of the difference during DELTAt sec is obtained and a curve (a), for example, corresponding to the flow rate Q of fuel is selected to obtain the integral value A corresponding to a proper O2 %. A difference B between a present value Y and the optimum value A is obtained and the amount of control C, in which the amount of control proportional to the difference B is added to the amount of control proportional to the integral value of the difference B, is operated so that the difference B becomes zero. The opening degree of a valve 9 in that case is compared with the same at present and a deviation is obtained by a temperature regulator 13 as an airflow rate regulating signal D to output it to a combustion air flow rate regulator 19. The regulator 19 receives the signals C, D and obtains an airflow rate regulating signal E from a compensating formula to output it to the valve 9 and regulate the opening degree of the same. |
