Temperature control device

A temperature control device characterized in comprising:

• a primary circuit that adjusts the temperature of a first heating medium to a specified temperature;
• a secondary circuit that adjusts the temperature of a second heating medium supplied to a load to a target temperature (SV(S));
• a valve that adjusts the flow rate of the first heating medium that is mixed with or exchanges heat with the second heating medium;
• a supply temperature detection unit that detects the current supply temperature (Pt1) of the second heating medium;
• a PID arithmetic unit that calculates the manipulated variable (MV) of said valve based on the target temperature (SV(S)) of the second heating medium, the current supply temperature (Pt1) of the second heating medium, and a predetermined set of PID constants;
• a compensation arithmetic unit that calculates a compensated manipulated variable (MV′) by compensating the manipulated variable (MV) calculated by said PID arithmetic unit, where said compensating comprises multiplying the manipulated variable (MV) by a compensation factor k (0≦k≦1) and where k is defined as follows:
• k=1−(Pt1−PV1)(1−n)/(PV2−PV1)
• where,
• PV1:
• lower limit of the operating temperature of the second heating medium;
• PV2:
• upper limit of the operating temperature of the second heating medium;
• Pt1:
• current supply temperature of the second heating medium;
• and
• n:
• a constant for limiting the manipulated variable when the second heating medium supply temperature is equal to the upper limit PV2;
• and
• a control unit that controls the operation of said valve based on the compensated manipulated variable (MV′), wherein
• the variation (ΔMV) of the manipulated variable (MV) is made proportional to the variation (ΔPV) of the current supply temperature (Pt1) of the second heating medium by means of controlling the operation of said valve based on the compensated manipulated variable (MV′).