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    • 74. 发明公开
    • THERMAL FLOW RATE MEASURING DEVICE
    • EINRICHTUNG ZUR MESSUNG DER THERMISCHENSTRÖMUNGSRATE
    • EP1813918A1
    • 2007-08-01
    • EP04822389.5
    • 2004-11-11
    • HITACHI, LTD.
    • KANKE, Atsushi c/o HITACHI, LTD.
    • G01F1/68
    • G01F1/6965G01F1/6845G01F1/72
    • Thermal type flow rate meters for measuring the flow rate of intake air of an internal combustion engine of a motor vehicle or the like have encountered a problem of an increase in pulsation errors during high engine speed and high pulsation. Meanwhile, digitally recovering responses has posed a problem in which pulsation performance is liable to become worse, affected by variation in a clock or the like. The sensor is provided with means for transferring a response variation factor to the engine control unit. The engine control unit is provided with logics for automatically determining the variation factor and correcting a response. Means for detecting a backflow occurrence is provided and a parameter for a response recovery is changed before and after a backflow occurrence. The sensor is provided with a selecting means by which a sensor response can be selected and obtained and the engine control unit is provided means for allowing selection of a response.
    • 用于测量机动车辆等的内燃机的进气的流量的热式流量计已经遇到在高发动机转速和高脉动期间脉动误差增加的问题。 同时,数字恢复响应已经引起了脉动性能易于变差的问题,受到时钟等的变化的影响。 传感器具有用于将响应变化因子传递到发动机控制单元的装置。 发动机控制单元具有用于自动确定变化因子和校正响应的逻辑。 提供用于检测回流发生的装置,并且在回流发生之前和之后改变响应恢复的参数。 该传感器设置有选择装置,通过该选择装置可以选择和获得传感器响应,并且提供引擎控制单元用于允许选择响应的装置。
    • 77. 发明公开
    • System and method for regulating bridge voltage in a intermittently heated hot-wire anemometer
    • 系统和方法,用于在间歇加热的热丝风速计桥电压的调节
    • EP1703262A1
    • 2006-09-20
    • EP06111142.3
    • 2006-03-14
    • TEXAS INSTRUMENTS INCORPORATED
    • HAGAN, Tobin DBALDWIN, David JGROSE, William E
    • G01F1/68
    • G01F1/696
    • In accordance with the teachings of the invention, a system and method for regulating bridge voltage in a discrete-time hot-wire anemometer is provided. In a particular embodiment, the hot-wire anemometer includes a bridge circuit including a hot-wire resistor, first and second input terminals, and first and second output terminals, the hot-wire resistor having a resistance dependent at least in part on an airflow past the hot-wire resistor. The hot-wire anemometer further includes a first operational amplifier coupled to the output terminals of the bridge circuit, the first operational amplifier operable to generate an output signal in response to a voltage differential across the first and second output terminals of the bridge circuit, and a second operational amplifier operable to generate an output signal in response to the output signal of the first operational amplifier and to a discontinuous time control signal. A switching mechanism cycles a supply voltage to the input terminals of the bridge circuit in response to output signal of the second operational amplifier such that the supply voltage is intermittently connected to the input terminals the bridge circuit, and an inductor coupling the switching mechanism to the first input terminal of the bridge circuit operable to low-pass filter an output voltage of the bridge circuit.
    • 在符合本发明的系统和方法用于在离散时间热线风速计调节电压桥的教导雅舞蹈设置。 在特定实施例中,热线风速计包括桥电路,其包括一个热丝电阻,第一和第二输入端子,以及第一和第二输出端子,具有电阻依赖性至少部分地基于在气流中的热丝电阻 经过热丝电阻器。 热线式风速计进一步包括耦合到所述电桥电路的输出端的第一运算放大器,用于在所述第一运算放大器,以在输出信号产生响应于过桥电路的第一和第二输出端的电压差,和 可操作第二运算放大器在输出信号响应于所述第一运算放大器的输出信号和不连续的时间控制信号产生。 一种开关机构的周期检查的电源电压到电桥电路的输入端子,响应于所述第二运算放大器的输出信号并在电源电压间歇地连接到所述输入端子上的电桥电路,以及电感器耦合的切换机构的 桥式电路,用于低通滤波器,以电桥电路的输出电压的第一输入端。