Temperature estimation method, temperature estimation program and temperature estimation device

A non-transitory computer-readable storage medium storing a temperature estimation program that, when executed by a computer, causes the computer to execute steps of:

• calculating an internal temperature of a test subject based on a temperature of a surface of the test subject and a temperature at a position away from the test subject;
• detecting a starting point of time of a transient response of the internal temperature;
• obtaining coefficients of each of a plurality of model functions that model a change in the internal temperature during the transient response for a part of a coefficient calculation section from the starting point of time of the transient response until a predetermined transient response convergence evaluation time elapses;
• determining a correction section of the internal temperature for each of the plurality of model functions;
• calculating results of correcting the internal temperature in the correction section using each of the plurality of model functions;
• evaluating the results of correcting the internal temperature to determine a most preferred correction result from the results and select the correction section for the model function among the plurality of model functions that yielded the most preferred correction result;
• and
• replacing data in the selected correction section among time-series data of the internal temperature with the most preferred correction result.

A temperature estimation apparatus, the apparatus comprising:

• a first temperature sensor configured to measure a temperature of a surface of a test subject;
• a second temperature sensor configured to measure a temperature at a position away from the test subject;
• a temperature calculation circuit configured to calculate an internal temperature of the test subject based on the temperature of the surface of the test subject and the temperature at the position away from the test subject;
• a transient response detection circuit configured to detect a starting point of time of a transient response of the internal temperature;
• a coefficient calculation circuit configured to obtain coefficients of each of a plurality of model functions that model a change in the internal temperature during the transient response for a part of a coefficient calculation section from the starting point of time of the transient response until a predetermined transient response convergence evaluation time elapses;
• a correction section determination circuit configured to determine a correction section of the internal temperature for each of the plurality of model functions;
• a temperature correction circuit configured to calculate results of correcting the internal temperature in the correction section using each of the plurality of model functions;
• a correction result evaluation circuit configured to evaluate the results of correcting the internal temperature from the temperature correction circuit to determine a most preferred correction result from the results and select the correction section for the model function among the plurality of model functions that yielded the most preferred correction result;
• and
• a correction result output circuit configured to replace data in the selected correction section among time-series data of the internal temperature with the most preferred correction result.