Gas flow rate measurement device

Abstract

The present invention provides a thermal flow rate measurement device that is capable of highly accurate correction of the temperature of an intake gas flow rate using a two-dimensional correction map that stores a correction value in association with temperature and intake gas flow rate. A gas flow rate measurement device that corrects a flow rate detection signal using a correction amount in which the correction amount is a correction amount in which a position displaced from a grid point of an orthogonal grid on a correction mapA is an acquisition point, and stores positional information of the acquisition pointon the correction mapA, and, at a time of flow rate measurement, determines a reference input flow rate that refers to the correction mapA on the basis of the positional information from a flow rate detection signal, determines a reference input temperature that refers to the correction mapA on the basis of the positional information from a temperature detection signal, and determines a correction amount corresponding to an input flow rate of an input flow rate Q axis corresponding to the reference input flow rate and an input temperature of an input temperature T axis corresponding to the reference input temperature.