PROBLEM TO BE SOLVED: To provide an oxygen flow rate information acquiring device and the like capable of accurately acquiring a flow rate value without a large amount of calculation and based on each of table data.SOLUTION: The flow rate information acquiring device is composed to have a standard flow rate voltage information memory unit for storing flow rate sensor voltage information corresponding to 3 specific flow rate information as the standard voltage information and the standard flow rate information by correlating to the corresponding flow rate information, to select the standard voltage information that is nearest to the output voltage information of the flow rate sensor as the target standard voltage information, to select the voltage information in which the voltage is lower than the target standard voltage information and the voltage information in which the voltage is higher, to select the standard flow rate information corresponding to the target standard voltage information, the lower voltage information and the higher voltage information, to acquire tangent line slope information at the cross point of the target standard voltage information and the target standard flow rate information in an orthogonal coordinate system using the least-square method, and to calculate the output voltage corresponding flow rate information corresponding to the output voltage information of the flow rate sensor based on the tangent line slope information, the output voltage information, the target standard voltage information and the target standard flow rate information.COPYRIGHT: (C)2011,JPO&INPIT【課題】計算量が膨大でなく、且つ、各テーブルデータに基づき流量値を精度良く取得することができる酸素流量情報取得装置等を提供すること。【解決手段】3個の特定の流量情報に対応する流量センサ電圧情報を、当該対応する流量情報と関連付けて、基準電圧情報及び基準流量情報として記憶する基準流量電圧情報記憶部を有し、流量センサの出力電圧情報に最も近い基準電圧情報を選択して目標基準電圧情報とし、目標基準電圧情報より電圧が低い電圧情報と、電圧が高い電圧情報を選択し、目標基準電圧情報、低い電圧情報、高い電圧情報に対応する基準流量情報を選択し、目標基準電圧情報と目標基準流量情報の直交座標系における交点の接線傾き情報を、最小二乗法を用いて求め、接線傾き情報、出力電圧情報、目標基準電圧情報及び目標基準流量情報に基づき、流量線さの出力電圧情報に対応する出力電圧対応流量情報
