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公开(公告)号：EP1957945A1
公开(公告)日：2008-08-20
申请号：EP06819596.5
申请日：2006-11-20
发明人： BIERL, Rudolf , LESSER, Martin , MEYER, Andreas , STEUBER, Frank
IPC分类号： G01F1/66
CPC分类号： G01F1/66 , G01F1/86 , G01F15/043
摘要： A gas, whose mass flow is intended to be determined, flows through a flow channel (2). A device (1) for determining the mass flow has sound transducers (4) at the ends of a measurement path (5), which sound transducers (4) can be used to determine the delay time of sound signals (7, 8). The flow rate of the gas and the speed of sound can be determined from the delay time. A total mass flow is determined from the flow rate and also from pressure and temperature. The proportion of a further gas in the total mass flow can be determined from the speed of sound and the total mass flow can be corrected to the mass flow of the gas.
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2.发明公开SCHALTUNGSANORDNUNG ZUM BIDIREKTIONALEN BETRIEB VON AN DEN ENDEN EINER MESSSTRECKE ANGEORDNETEN SCHALLWANDLERN 有权对于双向运算电路的测量电路的两端ARRANGED声变换器
公开(公告)号：EP2064527A1
公开(公告)日：2009-06-03
申请号：EP07803249.7
申请日：2007-09-05
IPC分类号： G01F1/66
CPC分类号： G01F1/667
摘要： A sensor circuit (11) for a flow sensor comprises terminating impedances (22, 23) connected in parallel to the sound transducers (4, 5) and has a signal generator, which is configured as a power source (31). The circuit arrangement is suitable particularly for the operation of an airflow sensor in internal combustion engines.
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3.发明授权SCHALTUNGSANORDNUNG ZUM BIDIREKTIONALEN BETRIEB VON AN DEN ENDEN EINER MESSSTRECKE ANGEORDNETEN SCHALLWANDLERN 有权对于双向运算电路的测量电路的两端ARRANGED声变换器
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公开(公告)号：EP2029976B1
公开(公告)日：2010-08-18
申请号：EP07729441.1
申请日：2007-05-23
发明人： HACKER-LEMIRE, Birgitta , HAUSCHEL, Jan-Erik , PESAHL, Stefan , SETESCAK, Stephen , STEUBER, Frank
CPC分类号： G01F1/6842 , G01F5/00 , G01F15/12
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公开(公告)号：EP2032820A1
公开(公告)日：2009-03-11
申请号：EP07729728.1
申请日：2007-05-31
发明人： BIERL, Rudolf , LESSER, Martin , MEYER, Andreas , STEUBER, Frank
CPC分类号： G01P3/44 , F02B37/14 , F02B39/16 , F02D41/0007 , F02D41/18 , F02D2041/285 , F02D2200/025
摘要： The present invention relates to a method and a device for monitoring an exhaust-gas turbocharger of an internal combustion engine. In order to create a cheap and also reliably operating method and a corresponding device for monitoring an exhaust-gas turbocharger, it is proposed that a sound transducer (5, 11) which is designed to record rotational-speed-dependent turbocharger operating noise is provided, which sound transducer (5, 11) is connected to an electronic system (10) for frequency analysis for the output of a turbocharger rotational speed signal (figure 1).
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