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    • 1. 发明公开
    • THERMAL TYPE FLOW MEASURING DEVICE
    • 热式流量测量装置
    • EP1418408A4
    • 2006-11-08
    • EP01956885
    • 2001-08-14
    • HITACHI LTDHITACHI CAR ENG CO LTD
    • HORIE JUNICHIWATANABE IZUMIIGARASHI SHINYANAKADA KEIICHIUEYAMA KEI
    • G01F1/684G01F1/698
    • G01F1/698G01F1/6845
    • A thermal type flow measuring device comprising: an heating resistor (HF); a temperature measuring resistor (Ru) upstream of the heating resistor (HF) with respect to a fluid (Q); and a temperature measuring resistor (Rd) downstream of the heating resistor (HF). A heat sensitive resistance element (CF), the upstream temperature measuring resistor (Ru) and the downstream temperature measuring resistor (Rd) form a first bridge circuit, and this first bridge circuit and the heating resistor (HF) form a second bridge circuit. Feedback control means (OP1, Tr) heat the heating resistor (HF) on the basis of the balance keeping output of the second bridge circuit. The distance between the heat sensitive resistance element (CF) and the heating resistor (HF) is larger than the distance between the upstream temperature measuring resistor (Ru) or the downstream heat sensitive resistor (Rd) and the heating resistor (HF) so that the heat sensitive resistor element (CF) is positioned to receive less thermal influences from the heating resistor (HF) than the upstream temperature measuring resistor (Ru) and the downstream heat sensitive resistor (Rd), and so that the upstream temperature measuring resistor or the downstream temperature measuring resistor is heated by the heating resistor thereby to measure the flow rate of the fluid on the basis of an output for keeping the balance of the first bridge circuit.