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    • 94. 发明授权
    • System and method for compensation of contamination of a heated element in a heated element gas flow sensor
    • 用于补偿加热元件气体流量传感器中加热元件污染的系统和方法
    • US06756571B2
    • 2004-06-29
    • US10273050
    • 2002-10-17
    • George SaikalisShigeru Oho
    • George SaikalisShigeru Oho
    • H05B102
    • G01F1/6983F02D41/187G01F1/6965G01N27/18
    • A system for compensation of contamination of a heated element in a heated element gas flow system in which the heated element becomes heated from an ambient temperature to an elevated temperature upon the application of electrical power to the heated element during a startup time period. The system includes a processing circuit having an input and an output. A voltage signal from the heated element is connected to the input of the processing circuit. The processing circuit reads a plurality of temporally spaced input signals as data from the processing circuit input during the startup time period. The processing circuit then computes the parameters of a transfer function corresponding to the data on its input. The processing circuit then calculates a contamination correction factor as a function of at least one parameter of the transfer function. The processing circuit then utilizes the correction factor to modify a measured gas flow rate by the gas flow meter after the heated element attains the elevated steady state temperature to compensate for contamination of the heated element.
    • 一种用于补偿加热元件气体流动系统中被加热元件的污染的系统,其中在启动时间段期间将加热的元件从环境温度加热到升高的温度。 该系统包括具有输入和输出的处理电路。 来自加热元件的电压信号连接到处理电路的输入端。 处理电路在启动时间周期期间从作为处理电路输入的数据读出多个时间间隔的输入信号。 然后,处理电路计算与其输入上的数据相对应的传递函数的参数。 然后,处理电路计算作为传递函数的至少一个参数的函数的污染校正因子。 然后,处理电路利用校正因子在加热元件达到升高的稳态温度之后通过气体流量计来修改测量的气体流量,以补偿被加热元件的污染。