| 摘要 |
PURPOSE: To improve reliability of the whole of a system by a method wherein a feedforward signal considering a waste time of the answer of a piping and a valve for radiation from a difference in a quantity of heat between a quantity of heat generated by an engine and an amount of heat absorbed by hot water utilizing equipment is incorporated in a control system to detect the heat source water temperature of an engine inlet and effect feedback control. CONSTITUTION: The inlet temperature of an engine 2 is detected by a temperature sensor 9 and PID computation of a deviation from a set value is effected to control a valve 7. Meanwhile, a rated quantity of a generated heat of an engine 2 is computed by a computing device 12. From the opening of a valve 5 for hot water utilizing equipment 4, a quantity of an absorption heat is computed by utilizing an absorption heat quantity-valve opening characteristic, and from a difference between a rated quantity of a generating heat and a quantity of an absorption heat, a quantity of heat discharged by a radiator 6 is calculated. Based on the quantity of heat, the opening of the valve 7 is decided by utilizing a quantity of the discharge heat-valve opening characteristics of the valve 7. The valve opening signal passes a waste time element, considering the waste time of a piping of which a generation block 20 for a feedforward signal consists and an answer time of the valve 7 and is synthesized and added to a PID computing result. |
