DEVICE FOR POST-TREATMENT OF WASTE GAS

Abstract

A device for exhaust-gas aftertreatment, including a delivery device 2 for delivering a liquid additive out of a tank 1, a pressure sensor 6, an exhaust line 5, a delivery line 3 leading from the delivery device 2 to the exhaust line 5, and an injection device 4 for introducing the delivered additive into the exhaust line 5. The pressure sensor 6 is arranged on the injection device 4.

Claims

1. A device for exhaust-gas aftertreatment, comprising: a delivery device for delivering a liquid additive out of a tank; a pressure sensor; an exhaust line; a delivery line leading from the delivery device to the exhaust line; and an injection device for introducing the delivered additive into the exhaust line; wherein the pressure sensor (6) is arranged on the injection device (4).

2. The device of claim 1, wherein the pressure sensor (6) is fastened to the housing (7) of the injection device (4).

3. The device of claim 2, the housing (7) of the injection device (4) further comprising an opening (8) into which the pressure sensor (6) is inserted.

4. The device of claim 2, wherein the pressure sensor (6) is flange-mounted on the housing (7) of the injection device (4).

5. The device of claim 4, further comprising: an opening in the housing; and a pressure connection to the pressure sensor; wherein the pressure connection to the pressure sensor (6) exists via the opening (8) in the housing (7).

6. The device of claim 1, wherein the pressure sensor (6) is arranged within the housing (7) of the injection device (4).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The invention will be discussed in more detail on the basis of multiple exemplary embodiments. In the drawings:

[0013] FIG. 1 shows a device according to the invention for exhaust-gas aftertreatment;

[0014] FIG. 2 shows a first enlarged illustration of the injection device; and

[0015] FIG. 3 shown a second enlarged illustration of the injection device.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0016] The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

[0017] FIG. 1 schematically shows a device for exhaust-gas aftertreatment in a motor vehicle. A tank 1 for the liquid additive, in this case an aqueous urea solution, is arranged in the motor vehicle. By means of a delivery device 2, the urea solution is drawn in from the tank 1 and is delivered via a delivery line 3 to an injection device 4. The injection device 4 is arranged on an exhaust line 5 of the motor vehicle. By means of the injection device 4, the urea solution is injected into the exhaust line 5, where it mixes with the exhaust gas. To provide the urea solution to the exhaust-gas line 5 in adequate quantities in a manner dependent on the exhaust-gas flows that arise during the operation of the motor vehicle, the urea solution must be present at the injection device 4 at a particular pressure. The pressure is normally 5 to 7 bar. On the injection device 4, there is arranged a pressure sensor 6 which, owing to the immediate proximity, is connected hydraulically rigidly to the injection device 4. If urea solution is injected via the injection device 4, the pressure drop caused as a result is recorded directly and to the full extent by the pressure sensor 6.

[0018] FIG. 2 shows the injection device 4 arranged on the exhaust line 5 in an enlarged illustration. The pressure sensor 6 is flange-mounted on the housing 7 of the injection device 4. The pressure in the injection device 4 is directly detected by the pressure sensor 6 via an opening 8, and is fed as an electrical signal via a line 9 to a control unit (not illustrated).

[0019] In FIG. 3, the pressure sensor 6 is inserted into the opening 8 of the housing of the injection device 4, such that the pressure sensor is in direct and immediate contact with the additive and measures the pressure prevailing in the injection device 4.

[0020] The description of the invention is merely exemplary in nature and, thus, variations that do not depart from the gist of the invention are intended to be within the scope of the invention. Such variations are not to be regarded as a departure from the spirit and scope of the invention.