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1. 发明公开

EP1418408A4 THERMAL TYPE FLOW MEASURING DEVICE 有权
标题翻译：热式流量测量装置
公开(公告)号：EP1418408A4
公开(公告)日：2006-11-08
申请号：EP01956885
申请日：2001-08-14
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： HORIE JUNICHI , WATANABE IZUMI , IGARASHI SHINYA , NAKADA KEIICHI , UEYAMA KEI
IPC分类号： G01F1/684 , G01F1/698
CPC分类号： G01F1/698 , G01F1/6845
摘要： 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.

2. 发明公开

EP1319929A4 THERMAL TYPE AIR FLOWMETER 审中-公开
标题翻译：热式空气流量计
公开(公告)号：EP1319929A4
公开(公告)日：2006-07-12
申请号：EP00948246
申请日：2000-07-27
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： NAKADA KEIICHI , WATANABE IZUMI , UEYAMA KEI , YAMADA MASAMICHI
IPC分类号： F02D41/18 , G01F1/684 , G01F1/692 , G01F1/698
CPC分类号： G01F1/684 , F02D41/187 , G01F1/6842 , G01F1/6845 , G01F1/692 , G01F1/698 , G01F5/00 , H01L2224/48091 , H01L2224/8592 , H01L2924/19105 , H01L2924/00014
摘要： In a thermal type air flowmeter, an air flow rate measuring element and the intake air temperature measuring element of an intake air temperature sensor are mounted on a single support made of glass ceramic or the like and positioned in an intake passage. The support is held by a holder attached to the pipe wall of an intake pipe. Both surfaces of part of the support that are away from the pipe wall of the intake pipe are constructed such that their heat can be easily removed by air flowing in the intake pipe. Disposed on the heat-removed support surfaces are the air flow rate measuring element and the intake air temperature element. These elements are electrically connected respectively to conductors disposed on the support, and these electric connections are sealed by resin. This allows integration of the intake air temperature sensor and the air flowmeter.

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