| 摘要 |
A diesel exhaust fluid (DEF) tank has a pump on or in the bottom thereof. A first resistive heating element 130 is associated with the pump, and a plurality of second resistive heating elements 140 is attached to the inner surface of a side wall of the tank. In a first aspect the pump is housed in a deepening in the bottom of the tank. A second aspect provides a method of heating the tank. The method comprises estimating the freezing conditions of the DEF in the tank using at least two sensors, a first sensor 110 close to the pump, and a second sensor 120 close to the inner surface of the side wall. If the first sensor detects frozen DEF, the first resistive heating element is operated. If the second sensor detects frozen DEF, the plurality of second resistive heating elements is operated. The DEF is typically urea which is decomposed to form ammonia for use in a selective catalytic reduction (SCR) catalyst. |
