Method for Heating a SCR System
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United States of America Patent
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Mar 11, 2009
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Mar 11, 2008
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Abstract
Process for heating a urea component of a SCR system comprising besides said component, a temperature sensor, a heating device in the component, according to which: 1. the temperature (Tcpt) of the liquid in the component is determined and compared to a 1.sup.st setpoint (T0); 2. if the temperature (Tcpt) is greater than the 1.sup.st setpoint (T0), step 1 is repeated; 3. if the temperature (Tcpt) is less than or equal to the 1.sup.st setpoint (T0), the heating device is actuated, 4. the time during which the heating device is actuated is measured and the heating device is stopped if this time is greater than a time t1; 5. the temperature (Tcpt) is determined after a time t2 and compared to a 2.sup.nd setpoint (T1 with T1>T0); if the temperature (Tcpt) is less than or equal to the 2.sup.nd setpoint (T1) the heating device is actuated and step 4 is repeated; 6. if the temperature (Tcpt) is greater than the 2.sup.nd septoint (T1), the heating device is stopped and step 1 is repeated.
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