| 摘要 |
A method to defrost a control fluid in a tank (10) of an exhaust system (2) provided with exhaust gas aftertreatment in an internal combustion engine (1) comprising a reversible pumping device (11), which is drowned inside the tank (10) and is driven by an electric motor (M), preferably a brushless DC motor (M); the method comprises the steps of detecting the current temperature of the control fluid inside the tank (10); and controlling the electric motor (M) in a non-efficient manner, so as to generate a thermal power due to Joule effect that helps defrost the control fluid close the pumping device (11), in case the current temperature of the control fluid is below a safety value (Vs), which indicates the frosting of the control fluid contained in the tank (10). |
