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    • 69. 发明申请
    • Device for Determining a Mass Flow
    • 用于确定质量流量的装置
    • US20090249888A1
    • 2009-10-08
    • US12086300
    • 2006-11-20
    • Rudolf BierlMartin LesserAndreas MeyerFrank Steuber
    • Rudolf BierlMartin LesserAndreas MeyerFrank Steuber
    • G01F1/66G01F1/68
    • G01F1/66G01F1/86G01F15/043
    • A device is provided for determining a mass flow of a first gas flowing in a flowing channel of an internal combustion engine of a motor vehicle. The device includes: sound transducers arranged at respective ends of a measuring path for providing sound signals, a temperature sensor for determining a temperature of an overall mass flowing in the flow channel, and an evaluation unit arranged downstream of the sound transducers. The evaluation unit is capable of carrying out the following: determining a flow rate of the overall mass and a speed of sound based on delay times of the sound signals, determining an overall mass flow based on the flow rate, the temperature, and a pressure of the overall mass in the flowing channel, ascertaining a proportion of a second gas flowing in the flow channel at a temperature above 10° C. and based on the speed of sound and the temperature, and correcting the overall mass flow to obtain the mass flow of the first gas.
    • 提供了一种用于确定在机动车辆的内燃机的流动通道中流动的第一气体的质量流量的装置。 该装置包括:布置在用于提供声音信号的测量路径的相应端部处的声音换能器,用于确定在流动通道中流动的总体质量的温度的温度传感器,以及布置在声音换能器下游的评估单元。 评估单元能够执行以下操作:基于声音信号的延迟时间来确定总质量的流量和声速,基于流量,温度和压力来确定总质量流量 确定在高于10℃的温度下在流动通道中流动的第二气体的比例,并且基于声速和温度校正总体质量流量以获得质量 第一气体的流动。