Determining the temperature of an exhaust gas sensor by means of calibrated internal resistance measurement
    1.
    发明授权
    Determining the temperature of an exhaust gas sensor by means of calibrated internal resistance measurement 有权
    通过校准的内阻测量来确定废气传感器的温度

    公开(公告)号:US06939037B2

    公开(公告)日:2005-09-06

    申请号:US10399152

    申请日:2002-07-06

    CPC分类号: F02D41/1496

    摘要: For achieving a highest possible measuring accuracy of a circuit for measuring the internal resistance of an exhaust-gas sensor, a method and a circuit for measuring the internal resistance R1 (10) of an electrochemical cell (12) are provided for determining the temperature of an exhaust-gas sensor, especially of a motor vehicle. The circuit is provided with the objective to improve the control to a constant temperature to therefore also improve the performance of the exhaust-gas sensor. A measurement current I_Mess (20) is applied to the internal resistance R1 (10) of the electrochemical cell (12) and a resulting first voltage is detected. A switchover to a reference resistor R2 takes place from time to time or at regular time intervals. With a switchover to the reference resistor R2, the resulting second voltage is stored and thereafter is applied as a reference value for the measurement of the internal resistance R1 (10). The switchover (18) to the reference resistor R2 takes place, for example, via force/sense lines.

    摘要翻译: 为了实现用于测量排气传感器的内部电阻的电路的最高测量精度,提供了用于测量电化学电池(12)的内部电阻R 1(10)的方法和电路,用于确定温度 的废气传感器,特别是机动车辆。 该电路的目的是改善对恒温的控制,从而也提高废气传感器的性能。 将测量电流I_Mess(20)施加到电化学电池(12)的内部电阻R 1(10),并且检测到所得到的第一电压。 对参考电阻R 2的切换是不时或以规律的时间间隔进行的。 通过切换到参考电阻器R 2,存储所得到的第二电压,然后施加作为用于测量内部电阻R 1(10)的参考值。 例如,通过力/感测线进行到参考电阻器R 2的切换(18)。