信号処理による自動車用熱線式エアフローセンサの検出誤差補正 : 脈動流中におけるボビン式熱線素子の検出流量低下誤差の補正手法

概要

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The bobbin type hot-wire (H/W) element of an air flow sensor has a tend ency to underestimate the actual flow rate when subjected to large-amplitude pulsatile flow. We investigated the causes of this measurement error and propose a new dynamic model for the bobbin type H/W element, which dynamically combines its static nonlinear output characteristic and its dynamic response. By inverting our bobbin type H/W dynamic model, we have developed a signal processing method to correct the measurement error of the bobbin type H/W. Measurements using this signal processing method show that it reduces the bobbin type H/W measurement error.
1999-02-25