Simulation method, recording medium wherein simulation program is stored, simulation device, and system

A simulation method run on a computer simulating the characteristics of a real controlled device including a cooling apparatus that changes a cooling value in accordance with a manipulated value, comprising:

• creating a controlled-device model representing the real controlled device where a manipulated value is an input and a process value for the real controlled device is an output;
• acquiring a first time-related characteristic as input to the controlled-device model;
• and
• calculating a second time-related characteristic from the output from the controlled-device model with respect to the input of the first time-related characteristic,
• wherein the controlled-device model comprises a gain representing a relationship between the manipulated value and an amount decreasing the process value,
• wherein the calculating the second time-related characteristic comprises:
• determining a cooling characteristic that defines a relationship between the manipulated value and a cooling capacity;
• and
• determining the gain from the cooling characteristic in accordance with a process value output immediately prior thereto,
• wherein the cooling characteristic comprises a first cooling characteristic in a region where the manipulated value is closer to zero than the nonlinear point, and a second cooling characteristic in the remaining region, and
• wherein the simulation method further comprises, when determining the cooling characteristic:
• shifting the second cooling characteristic for a reference process value toward the cooling capacity in accordance with a difference between the process value output immediately prior thereto and a reference process value;
• and
• determining the first cooling characteristic so that the first cooling characteristic connects to the shifted second cooling characteristic at the nonlinear point.