METHOD FOR DRAINING A DELIVERY UNIT FOR LIQUID ADDITIVE, DELIVERY UNIT AND MOTOR VEHICLE HAVING A DELIVERY UNIT
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United States of America Patent
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app pub date -
Oct 20, 2014
filing date -
Apr 19, 2012
priority date (Note) -
Abandoned
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Abstract
A method for draining a delivery unit for a liquid additive, in particular a urea-water solution, includes at least: a) producing an electrical connection by using a currentless switch which is constructed to produce an electrical connection when a temperature falls below a threshold temperature; and b) draining the delivery unit when, in step a), the electrical connection has been produced. The method can be used, in particular, in SCR systems for exhaust-gas aftertreatment for motor vehicles. A delivery unit and a motor vehicle having a delivery unit are also provided.
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