| 摘要 |
<p>PURPOSE:To restrict an excessive rise in the temperature of tapped hot water even at the time of a rapid change in the amount of hot water and enhance temperature characteristic of tapped hot water, by controlling the amount of heat supplied to a hot water supplying device in accordance with the results of proportional, integrating and differentiating calculations of the difference between a set temperature and the temperature of tapped hot water. CONSTITUTION:In a control gain part 8 conducting a temperature control, the difference TER between a set temperature signal TWR and a supplied hot water temperature signal TWO2 generated by a tapped hot water temperature detector 10 fitted to a process 9 to be controlled is processed by proportional, integrating and differentiating calculating parts 11-13 to obtain outputs Vp, VTi and VTd. The smaller of the sum total TC of the outputs and a comparison output TM obtained from comparison between the output VTd and a predetermined value Vs is selected by a smaller value selector 16, and is given to the process 9. In this case, a predeter mined value multiplier 17 for the integrated value is further provided, and when the output VTd is changed by not less than a predetermined value, the integral amount is maintained at a value which is obtained therefrom by multiplying by a predetermined value according to the sign (plus or minus) of the differential amount, and the thus maintained value is used as an initial value in integrating operation when the output VTd is converged within a predetermined value.</p> |
