Method for testing the operation of a heating element used for an activated carbon filter
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United States of America Patent
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Dec 3, 2013
Grant Date -
Apr 7, 2011
app pub date -
Oct 5, 2009
filing date -
Oct 5, 2009
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Abstract
The invention relates to a method for testing the operation of an electric heating element which is used for heating activated carbon of an activated carbon filter and/or air which is guided through the activated carbon for the regeneration thereof. The heating element has a PTC-characteristic (positive temperature coefficient characteristic). The strength of a current flow through the heating element in a heating phase selected for the operational testing is measured at a point in time or over a time period and is used for the operational testing, in that at least one measured current flow value is compared with a corresponding current flow value to be anticipated during defect-free operation of the heating element, and the heating element is considered to be defective in the event of a deviation which exceeds a predetermined measurement.
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