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METHOD FOR DETERMINING HC-CONVERSION EFFICIENCY OF A CATALYST, A DIAGNOSTIC DEVICE CONFIGURED TO CARRY OUT THE METHOD AS WELL AS A MOTOR VEHICLE HAVING SUCH A CATALYST
METHOD FOR DETERMINING HC-CONVERSION EFFICIENCY OF A CATALYST, A DIAGNOSTIC DEVICE CONFIGURED TO CARRY OUT THE METHOD AS WELL AS A MOTOR VEHICLE HAVING SUCH A CATALYST
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机译:确定催化剂的HC转化效率的方法,构造为实施该方法的诊断装置以及具有这种催化剂的机动车
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摘要
The invention relates to a method to determine the HC-conversion efficiency of a catalyst, which is situated in the exhaust gas flow path of an internal combustion engine and which is configured to convert hydrocarbons, by means of an oxygen-sensitive sensor that is installed downstream from the catalyst in the exhaust gas flow path and that exhibits a cross sensitivity to hydrocarbons. The method comprises: detecting a first signal of the downstream sensor in a first situation in which a first HC fraction is present in the exhaust gas upstream from the catalyst; detecting a second signal of the downstream sensor in a second situation in which a second HC fraction that is higher than the first HC fraction is present in the exhaust gas upstream from the catalyst; and determining the HC-conversion efficiency of the catalyst as a function of the first and second signals of the downstream sensor.
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