Patent ID: 8140191

Claim:
An environment control device, comprising: a biological information acquiring portion for acquiring time-series data of biological information of a user; a parameter calculating portion for calculating a parameter about the biological information through chaos analysis of the time-series data acquired by the biological information acquiring portion; an inferring portion for inferring a comfortable feeling of the user on the basis of the parameter calculated by the parameter calculating portion; and a stimulus control portion for controlling generation of a stimulus to be given to the user on the basis of a result of inference made by the inferring portion, wherein the parameter calculating portion includes a first parameter calculating portion for calculating a first parameter about the biological information through the chaos analysis of the time-series data and a second parameter calculating portion for calculating a second parameter about the biological information on the basis of a change of the time-series data, wherein the inferring portion infers the comfortable feeling of the user on the basis of the first parameter calculated by the first parameter calculating portion and the second parameter calculated by the second parameter calculating portion, wherein the first parameter calculating portion calculates a maximum Lyapunov exponent through the chaos analysis of the time-series data, wherein the second parameter calculating portion calculates an amplitude of a pulse wave or a maximum wave height value of the pulse wave from the time-series data, and wherein the inferring portion infers that a thermal sensation of the user has changed in a direction from a neutral state to a hot state in a case where the maximum Lyapunov exponent has increased and the amplitude of the pulse wave or the maximum wave height value of the pulse wave has increased, infers that the thermal sensation of the user has changed in a direction from a cold state to the neutral state in a case where the maximum Lyapunov exponent has decreased and the amplitude of the pulse wave or the maximum wave height value of the pulse wave has increased, infers that the thermal sensation of the user has changed in a direction from the neutral state to the cold state in a case where the maximum Lyapunov exponent has increased and the amplitude of the pulse wave or the maximum wave height value of the pulse wave has decreased, and infers that the thermal sensation of the user has changed in a direction from the hot state to the neutral state in a case where the maximum Lyapunov exponent has decreased and the amplitude of the pulse wave or the maximum wave height value of the pulse wave has decreased.