WO2019185555A1

WO2019185555A1 - Apparatus for dehumidifying a pressure sensor inlet line of a particle filter, and motor vehicle having the same

Info

Publication number: WO2019185555A1
Application number: PCT/EP2019/057466
Authority: WO
Inventors: Manfred Lauer
Original assignee: Bayerische Motoren Werke Aktiengesellschaft
Priority date: 2018-03-27
Filing date: 2019-03-25
Publication date: 2019-10-03
Also published as: DE102018204591A1

Abstract

The invention relates to an apparatus for dehumidifying a pressure sensor inlet line (11) of a particle filter (7), having an internal combustion engine (1); an air tract (2) upstream of the internal combustion engine (1); an exhaust-gas turbocharger, which comprises a compressor (3) in the air tract (2) and an exhaust-gas turbine (5); the particle filter (7) for filtering exhaust gases of the internal combustion engine (1); a pressure sensor (10), which measures a pressure in the particle filter (7); the pressure sensor line (11), which connects the pressure sensor (10) for the pressure measurement in the particle filter (7) to the particle filter (7), and a purge line (12), by means of which the pressure sensor line (11) can be flowed through with air from the air tract (2). The invention furthermore relates to a motor vehicle having an apparatus of said type.

Description

Device for dehumidifying a pressure sensor supply line of a

Particulate filter and motor vehicle with such

The invention relates to a device for measuring pressure in a

Particle filter of a motor vehicle.

In a particle filter, filtered particles or soot collect during operation, so that the so-called loading of a particle filter increases in the course of operation. Upon reaching a certain loading condition or

Soot content of the particulate filter is regenerated or burned to maintain the filter efficiency of the particulate filter. The loading state can be determined by determining a pressure within a

Particle filter housing, in particular upstream of a filter element, are determined. As an attachment of a pressure sensor on

Particle filter housing is difficult due to its high temperature, the pressure sensor from the particulate filter housing is spaced and connected by means of a hose with the particulate filter. When laying the hose, however, it must be ensured that the line rises from the particle filter to the pressure sensor so that condensation water can drain off. Condensation water in the hose line could otherwise falsify a pressure determination. It would be desirable in this connection to provide a way of determining the pressure in the particle filter, which allows a more flexible or less restrictive laying of the hose line. It is therefore an object of the present invention to at least partially overcome the aforementioned disadvantages. This object is achieved by a device for dehumidifying a pressure sensor supply line of a particulate filter according to claim 1 and a motor vehicle according to claim 9. Advantageous developments of the invention are the subject of the dependent claims.

According to one exemplary embodiment of the invention, an apparatus for dehumidifying a pressure sensor feed line of a particle filter is provided, with an internal combustion engine; an air tract upstream of the

Internal combustion engine; an exhaust gas turbocharger having a compressor in the air duct and an exhaust gas turbine; the particulate filter for filtering exhaust gases of the internal combustion engine; a pressure sensor that measures a pressure in the particulate filter; the pressure sensor line, which connects the pressure sensor for pressure measurement in the particle filter with the particle filter, and a purge line with which the pressure sensor line with air from the air tract can be flowed through. This has the advantage that the pressure sensor line no longer needs to be laid with a steady increase. Thereby

There are new degrees of freedom in the desolation of the pressure sensor and the installation of the pressure sensor line. By cyclically rinsing the

Pressure line towards particle filter can remove moisture from the

Pressure sensor line to be removed.

According to a further embodiment of the invention, the purge line branches off from the air duct downstream of the compressor and upstream of the internal combustion engine. This has the advantage that a sufficiently high pressure level is available to flush the pressure sensor line. According to a further embodiment of the invention, a

Flow through the flushing line can be released and shut off by means of a control valve. According to a further embodiment of the invention is the

Pressure sensor line sections of metal, this section is attached to the particulate filter. As a result, the pressure sensor line can withstand the high temperatures at the particle filter.

According to a further embodiment of the invention is the

Pressure sensor line in sections a rubber hose. This allows a more flexible guidance of the pressure sensor line.

According to a further embodiment of the invention, the

Device further comprises a charge air cooler in the air duct, which is arranged downstream of the compressor. According to a further embodiment of the invention, the purge line branches off from the air tract upstream of the intercooler.

According to a further embodiment of the invention, the purge line branches off from the air duct downstream of the charge air cooler.

In addition, the present invention provides a motor vehicle with such a device.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. These drawings show:

Figure 1 shows schematically a device for dehumidifying a

Pressure sensor supply line of a particulate filter according to a first embodiment of the invention, and Figure 2 shows schematically a device for dehumidifying a

Pressure sensor supply line of a particulate filter according to a second embodiment of the invention. Figure 1 shows schematically a device according to a first

Embodiment of the invention. An internal combustion engine 1, for example a gasoline engine or a diesel engine, is supplied with air via an air tract 2. Thus, the air tract 2 is air supply technology

upstream of the internal combustion engine 1, more precisely located upstream of combustion chambers of the internal combustion engine 1, and includes a compressor 3 of a turbocharger, which compresses a sucked ambient air. Downstream of the compressor 3 is in the air tract 2 a

Intercooler 4 is arranged, which cools the coming of the compressor 3 air. After the intercooler 4, the air is the combustion chambers of the

Internal combustion engine 1 supplied. The compressor 3 of the turbocharger is driven by an exhaust gas turbine 5, which in turn of the from

Internal combustion engine 1 exiting exhaust gases is driven.

Downstream of the exhaust gas turbine 5 is a catalyst 6 and downstream of the catalyst 6, a particulate filter 7 is arranged. It can the

Catalyst 6 and the particulate filter 7, as shown, be arranged in two separate housings. But it is also possible that the

Catalyst 6 and the particulate filter 7 share a common housing.

The particulate filter 7 is an Otto particle filter or a diesel particulate filter. A filter element 8 of the particle filter 7 filters the exhaust gases leaving the internal combustion engine 1, particles, in particular soot, accumulating on the filter element 8. The filter element 8 is of a

Particle filter housing 9 housed. To determine a loading of the particulate filter or the soot content in the particulate filter, a pressure sensor 10 is provided, which is connected via a pressure sensor line 11 with the particulate filter 7. More specifically, the pressure sensor 10 is connected to the interior of the Particle filter housing 9, in particular upstream of the filter element 8, connected.

At the end, which is connected to the particulate filter 7, is the

Pressure sensor line 11 preferably sections of metal to withstand the high temperatures on the particulate filter 7. At the other end, which is connected to the pressure sensor 10, the pressure sensor line 11 is preferably formed in sections as a rubber line. At the

End region, which is connected to the pressure sensor 10, opens a purge line 12 into the pressure sensor line 11. The other end of the

Flush line 12 branches off from the air tract 1. In this first

Embodiment branches off the purge line 12 downstream of the compressor 3 and upstream of the intercooler 4 from the air tract 2 from. Furthermore, the purge line 12 is provided with a control valve 13, with which a

Flow through the purge line 13 can be blocked and released. If necessary, therefore, the pressure line 11 can be traversed or flushed with air from the air tract 2, so that moisture from the

Pressure sensor line 11 is pressed into the particulate filter 11. With regard to the time of activation of the control valve 13 and thus the flushing of the pressure sensor line 11, various possibilities are conceivable.

For example, a flushing after burning off the

Particulate filter 7 take place. The advantage would be that it is avoided that by the flushing and the associated air entry from the air duct 2 in the particulate filter 7 otherwise a burning of the

Particulate filter 7 could be triggered by the flushing. However, it is also conceivable that this is what is desired, so that a flushing can be combined with a burning off of the particle filter 7. In this case, the particle filter can be supplied with oxygen or additional oxygen for regeneration via this line. For this purpose, the control valve 13 must be controlled in a suitable manner. Figure 2 shows schematically a device for dehumidifying the

Pressure sensor supply line 11 of the particulate filter 7 according to a second

Embodiment of the invention. In this case, the second embodiment differs from the first, described above

Embodiment only in that the purge line 12 downstream of the intercooler 4 and upstream of the engine 1 from

Air tract 2 branches off. Apart from this difference, reference is made in full to the description of the first embodiment. Which embodiment could be more suitable for a particular internal combustion engine depends in particular on what temperature prevails after the compressor 3. If this temperature is too high, then by the second embodiment, a comparatively cooler air downstream of the intercooler 4 for flushing the

Pressure sensor line 11 can be used.

While the invention in detail in the drawings and the

While the foregoing description and description has been presented and described, this illustration and description is to be considered illustrative or exemplary, and not restrictive, and is not intended to limit the invention to the disclosed embodiment. The mere fact that certain features are in

various dependent claims should not indicate that a combination of these features could not be used to advantage.

Claims

claims

1. Device for dehumidifying a pressure sensor supply line (11) of a particulate filter (7), with

an internal combustion engine (1);

an air tract (2) upstream of the internal combustion engine (1);

an exhaust gas turbocharger having a compressor (3) in the air duct (2) and an exhaust gas turbine (5);

the particulate filter (7) for filtering exhaust gases of the

Internal combustion engine (1);

a pressure sensor (10) measuring a pressure in the particulate filter (7); the pressure sensor line (11), which connects the pressure sensor (10) for pressure measurement in the particle filter (7) with the particle filter (7), and a purge line (12) with which the pressure sensor line (11) with air from the air tract (2) can be flowed through ,

2. Device according to claim 2, wherein the purge line (12) branches off from the air duct (2) downstream of the compressor (3) and upstream of the internal combustion engine (1).

3. Device according to one of the preceding claims, wherein a flow through the flushing line (12) by means of a control valve (13) can be released and shut off.

4. Device according to one of the preceding claims, wherein the

Pressure sensor line (11) is partially made of metal, wherein this

Section is attached to the particle filter (7).

5. Device according to one of the preceding claims, wherein the pressure sensor line (11) is partially a rubber hose.

6. Device according to one of the preceding claims, further comprising a charge air cooler (4) in the air duct, which is arranged downstream of the compressor (3).

7. Apparatus according to claim 6, wherein the flushing line (12) from

Air tract (2) branches off upstream of the intercooler (4).

8. The device according to claim 6, wherein the purge line (12) branches off from the air duct (2) downstream of the charge air cooler (4).

9. Motor vehicle with a device for dehumidifying a pressure sensor supply line (11) of a particulate filter (7) according to one of claims 1 to 8.