Device for providing a liquid reducing agent and motor vehicle having the device
View Patent ↗A device for providing a liquid reducing agent includes a reducing agent tank for storing a reducing agent. The reducing agent tank has a tank bottom including a separate chamber. A dosing or metering unit extracts reducing agent from the reducing agent tank at an extraction point disposed at the separate chamber. The dosing unit is disposed within the separate chamber. A motor vehicle having the device is also provided.
1. A device for providing liquid reducing agent, the device comprising:
a reducing agent tank configured to store liquid reducing agent, said reducing agent tank having a tank interior and a tank bottom;
said tank bottom having a main bottom plane and a separate chamber with an extraction point, said separate chamber being disposed in said tank bottom above said main bottom plane;
said separate chamber being a subvolume not filled with reducing agent, said subvolume of said separate chamber extending from said tank bottom in direction of said tank interior; and
a dosing unit including a pump disposed within said separate chamber and configured to extract the reducing agent from said reducing agent tank at said extraction point.
2. The device according to claim 1 , wherein said dosing unit is detachably connected to said reducing agent tank.
3. The device according to claim 1 , wherein said dosing unit has at least one component selected from the group consisting of:
a filter;
a pressure sensor;
a temperature sensor; and
a valve.
4. The device according to claim 1 , which further comprises a cover configured to close off said separate chamber from the environment, said dosing unit being fastened to said cover.
5. The device according to claim 1 , wherein said separate chamber is configured to be removed from said tank bottom.
6. The device according to claim 3 , which further comprises at least one click closure configured to fix said separate chamber in said tank bottom.
7. The device according to claim 1 , wherein said tank bottom is formed of plastic and said separate chamber is formed as a pot non-detachably inserted into said tank bottom.
8. The device according to claim 7 , wherein said non-detachably inserted pot is at least partially metallic.
9. The device according to claim 7 , which further comprises an O-ring injection-molded into said tank bottom at said pot for sealing.
10. The device according to claim 1 , wherein said separate chamber has a melting heater extending away from said tank bottom.
11. The device according to claim 1 , wherein said separate chamber has at least one heater.
12. The device according to claim 1 , wherein said reducing agent tank is formed with plastic and has at least one opening provided with a metallic sleeve.
13. The device according to claim 1 , wherein:
said tank bottom has a main bottom plane;
said dosing unit has a reducing agent outlet; and
said reducing agent outlet ends at a height of less than 50 mm [millimeters] below said main bottom plane.
14. The device according to claim 1 , which further comprises a stone chip guard disposed below said separate chamber.
15. A motor vehicle, comprising:
an internal combustion engine;
an exhaust-gas treatment system associated with said internal combustion engine and having an injector for reducing agent;
a device according to claim 1 ; and
a reducing agent line connecting said injector to said device.
16. The device according to claim 1 , which further comprises a cover configured to close off said separate chamber from the environment.
17. The device according to claim 1 , wherein said reducing agent tank has a wall, and said separate chamber has a wall with an upper part formed in one piece with said reducing agent tank wall.
18. The device according to claim 1 , wherein said separate chamber has a wall with an upper part formed in one piece with said reducing agent tank bottom.