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    • 3. 发明授权
    • Catalytic converter diagnostic sensor
    • 催化转化器诊断传感器
    • US5472580A
    • 1995-12-05
    • US257777
    • 1994-06-09
    • Frederick L. Kennard, IIICarlos A. ValdesEarl W. Lankheet
    • Frederick L. Kennard, IIICarlos A. ValdesEarl W. Lankheet
    • F01N11/00G01N27/406G01N27/407
    • F01N11/00G01N27/4065G01N27/407G01N27/4075F02D2041/147Y02T10/47
    • Generally, the instant invention includes a method of using a sensor having an outer electrode including a gold-containing layer to diagnose the efficiency and useful life of a catalytic converter. The sensor having a gold-containing layer is positioned in an exhaust gas, combustion engine downstream from both the engine and the catalytic converter used to clean the exhaust. The sensor produces an voltage output responsive to the combustibles concentration in the exhaust gas. The voltage output from the sensor is measured and compared to a predetermined threshold correlated to a desirable combustibles concentrations in the exhaust stream or to a threshold output indicative of an inefficiently operating catalytic converter. An electrical output is then provided which is responsive to the comparison. The electrical output may be an indicator light, gauge or other devices for instructing the operator of a vehicle that the catalytic converter requires maintenance. The gold-containing layer of the sensor may be a gold alloy containing at least 28 percent by weight gold. The gold-containing layer may be the sole outer electrode of the sensor, or the gold-containing layer may be formed on a conventional platinum electrode of the sensor.
    • 通常,本发明包括使用具有包含含金层的外部电极的传感器来诊断催化转化器的效率和使用寿命的方法。 具有含金层的传感器位于用于清洁排气的发动机和催化转化器下游的废气,内燃机中。 传感器响应于废气中的可燃物浓度产生电压输出。 测量来自传感器的电压输出,并将其与与排气流中期望的可燃物浓度相关联的预定阈值或指示低效操作的催化转化器的阈值输出进行比较。 然后提供响应于比较的电输出。 电输出可以是用于指示车辆的操作者的指示灯,表或其他装置,催化转化器需要维护。 传感器的含金层可以是含有至少28重量%金的金合金。 含金层可以是传感器的唯一外部电极,或者可以在传感器的常规铂电极上形成含金层。