DE102019006546A1 - Tempered compressed air mixture for an oil separator - Google Patents

Abstract

The invention relates to a device (100) for a particularly charged and / or charge air-cooled internal combustion engine, preferably for providing a temperature-controlled compressed air mixture for a compressed air-assisted oil separator (20), in particular for blow-by gases, with: a charge air cooler (10) , a first line (1) upstream of the charge air cooler (10), wherein the first line (1) is preferably designed to carry warm air, a second line (2) downstream of the charge air cooler (10), wherein preferably the second line (2) is designed for guiding cold air, and an oil separator (20), preferably an oil mist separator. The device (100) is particularly characterized in that a first branch line (3) branches off from the first line (1) and a second branch line (4) branches off from the second line (2) in order to connect the oil separator (20) with a Air mixture (M) of air from the first line (1) and air from the second line (2) to be supplied.

Description

The invention relates to a device for a preferably charged internal combustion engine, preferably for providing a temperature-controlled compressed air mixture for compressed air-assisted oil separators, in particular for blow-by gases. The charged internal combustion engine is designed in particular with a charge air cooler for recooling the (expediently pre-compressed) charge air. The oil separator is preferably an oil separator that operates with the aid of charge air.

Oil mist separators working with charge air support for internal combustion engines from e.g. B. Motor vehicles are known in the prior art in a wide variety of designs. It is customary to supply the oil mist separator with charge air, which is taken downstream behind a charge air cooler and which therefore corresponds to cold charge air. Charge air upstream of the charge air cooler is usually too hot to be able to use it for the oil mist separator. The supply of cold charge air can, however, lead to ice formation in the oil mist separator at low outside temperatures due to the water content in the blow-by gases of the internal combustion engine.

One object of the invention is to create a possibility by means of which an oil separator working with charge air support can be operated reliably even at low outside temperatures.

This problem can be solved with the features of the main claim. Advantageous further developments are disclosed in the subclaims or result from the following description of preferred embodiments of the invention.

The invention relates to a device for a (z. B. charged and / or charge air-cooled) internal combustion engine

The internal combustion engine can, for. B. be an internal combustion engine of a motor vehicle, preferably a commercial vehicle (z. B. a truck or bus), or an internal combustion engine z. B. a (especially stationary) work machine or a stationary unit.

The device is preferably used to provide a temperature-controlled compressed air mixture for a compressed air-assisted (z. B. charge air-assisted) working oil separator.

The device comprises e.g. B. a charge air cooler, a first line, a second line and an oil separator, preferably an oil mist separator, e.g. B. an oil separator for blow-by gases.

The first line is preferably formed upstream of the charge air cooler. The first line is preferably used to carry warm (especially hot) air, so that, for. B. a warm air flow can flow through the first line.

The second line is preferably formed downstream of the charge air cooler. The second line is preferably used to carry cold air, so that, for. B. a cold air flow can flow through the second line.

The air in the first line consequently preferably has a higher temperature than the air in the second line.

The device is particularly characterized in that a first branch line (in particular for warm air, expediently for a warm air flow) branches off from the first line and a second branch line (in particular for cold air, expediently a cold air flow) branches off from the second line, in order to supply the oil separator with an air mixture (e.g. an air flow mixture) of air from the first line and air from the second line and thus preferably an air mixture having a (appropriately desired temperature) mixed temperature.

As a result, an air mixture can be fed to the oil separator, the mixed temperature of which is composed of the temperature of the (expediently warm) air upstream of the charge air cooler and the temperature of the (expediently cold) air downstream of the charge air cooler.

It is possible that the air mixture z. B. contains less (expediently hot) air from the first line than (expediently cold) air from the second line.

It is possible that the first branch line z. B. has an at least partially smaller passage cross-section (e.g. a throttle point or essentially its entire length) than the second branch line, so that the air mixture preferably contains less (suitably hot) air from the first line than (suitably cold) air from the second line. In certain cases it can also be expedient for the smaller passage cross-section to be located in the second line and / or the second branch line.

The (expediently desired) mixing temperature and / or the (expediently desired) air mixture can preferably be made possible in that a smaller amount of air is withdrawn from the first line than from the second air line.

The device can e.g. B. have a controllable valve (z. B. a throttle valve) in order to variably control the composition and / or preferably thus the mixing temperature of the air mixture.

It is possible that the valve is formed in the first branch line and / or is designed to throttle a supply of air from the first branch line (expediently for the air mixture and / or the oil separator).

The device can e.g. B. comprise a mixing section for forming the air mixture and thus for mixing air from the first branch line and air from the second branch line.

The mixing section can e.g. B. have a (preferably static) mixer and / or comprise at least one essentially screw-shaped, lamellar and / or grid-shaped mixing element.

The mixing section can e.g. B. include the common line mentioned below, so that the common line can serve as a mixing section, expediently with or without mixing elements promoting the mixing.

The air mixture supplied to the oil separator is preferably a compressed air mixture (e.g. a charge air mixture), in particular a compressed air flow mixture.

The air mixture or compressed air mixture supplied to the oil separator is preferably tapped from the charge air for the internal combustion engine and can thus, for. B. be referred to as a charge air mixture (useful charge air flow mixture).

The oil separator can, for. B. be a compressed air (z. B. charge air) -supported working oil separator by means of the compressed air mixture.

The air (for example the first line, the second line, the first branch line and / or the second branch line) is preferably compressed air and / or, in particular, pre-compressed charge air.

To generate the compressed air and / or the compressed air mixture, the device can be a compressed air generating device, e.g. B. a compressor, preferably upstream of the first conduit.

The device can e.g. B. comprise a control device for controlling an internal combustion engine of the motor vehicle and / or for controlling the valve.

The first branch line and the second branch line can, for. B lead to a common line. The common line is preferably used to supply the air mixture to the oil separator.

In the context of the invention, a compressed air flow mixture (in particular a pre-compressed charge air mixture) with an expediently desired temperature can thus preferably be obtained by removing air (in particular charge air) both before the charge air cooler and after the charge air cooler and mixing the two air flows from the first branch line and the second branch line Mixing temperature can be reached. The mixed temperature can preferably be determined by throttling the air withdrawn upstream of the charge air cooler. The compressed air flow mixture generated by the mixing and thus tempered (in particular a pre-compressed charge air mixture) can then be used to operate the oil separator working with compressed air support.

The internal combustion engine is preferably a supercharged and / or charge air-cooled internal combustion engine,

The invention also relates to a motor vehicle, preferably a commercial vehicle, in particular a truck or bus, with a device as disclosed herein and e.g. B. an internal combustion engine.

It is possible that in particular precompressed charge air can be supplied to the internal combustion engine via the charge air cooler and / or the second line.

The invention further relates to a method for operating a device, preferably as disclosed herein, for an internal combustion engine, preferably for providing a temperature-controlled compressed air mixture for a charge-air-assisted oil separator, preferably for blow-by gases.

The device preferably comprises a charge air cooler, a first line upstream of the charge air cooler (wherein the first line is preferably designed to convey warm air), a second line downstream of the charge air cooler (wherein the second line is preferably designed to convey cold air) and an oil separator, preferably an oil mist separator.

The method is particularly characterized in that a first branch line branches off from the first line and a second branch line branches off from the second line and the oil separator with an air mixture, preferably a compressed air mixture consisting of air from the first line and air from the second line is supplied.

• 1 eine schematische Ansicht einer Vorrichtung gemäß einer Ausführungsform der Erfindung.
• 1 zeigt eine schematische Ansicht einer Vorrichtung 100 für einen aufgeladenen und Ladeluft-gekühlten Verbrennungsmotor z. B. eines Kraftfahrzeugs.

The preferred embodiments and features of the invention described above can be combined with one another as desired. Other advantageous developments of the invention are disclosed in the subclaims or result from the following description of preferred embodiments of the invention in conjunction with the attached figure. It shows:

• 1 a schematic view of a device according to an embodiment of the invention.
• 1 shows a schematic view of a device 100 for a supercharged and charge air-cooled internal combustion engine z. B. a motor vehicle.

The device 100 comprises a charge air cooler 10 , an oil separator 20th , in particular oil mist separators, and a compressed air generating device 50 in the form of a compressor for generating pressurized air, in particular pressurized charge air.

Reference numeral 60 designates schematically from the compressed air generating device 50 intake air, reference numeral 70 schematically designating an engine intake and / or an internal combustion engine.

A first line 1 extends upstream in front of the intercooler 10 , being the first line 1 is designed to conduct warm (hot) air, so that through the first line 1 a warm air current is flowing.

The first line 1 with its input side with the compressed air generating device 50 connected.

A second line 2 extends downstream behind the intercooler 10 , the second line 2 is designed for guiding cold air, so that through the second line 2 a cold air current is flowing.

By means of the interconnection of the intercooler 10 between the first line 1 and the second line 2 consequently has the air of the first line 1 a higher temperature than the air in the second line 2 .

A special feature is that from the first line 1 a first branch line 3 for consequently warm air (in particular a warm air flow) goes off and from the second line 2 a second branch line 4th for consequently cold air (especially a cold air flow) goes off to the oil separator 20th with an air mixture (in particular an air flow mixture) M composed of air from the first line 1 and air from the second line 2 to supply.

This can prevent the oil separator 20th a tempered air mixture M. are supplied, the mixed temperature is composed of the temperature of the (suitably warm) air of the first line 1 and the temperature of the (suitably cold) air of the second line 2 .

That the oil separator 20th supplied air mixture M. preferably has less air from the first line 1 on as air from the second line 2 .

To make this possible, the first branch line 3 z. B. an at least partially smaller passage cross-section, z. B. a throttle point 30th , as the second branch line 4th . However, it is z. B. also possible that the first branch line 3 has a smaller passage cross section than the second branch line essentially over its entire longitudinal extent 4th . In an alternative or additional embodiment, it is possible that the first branch line 3 with a controllable valve 31 Is provided. The valve 31 allows the composition and thus the appropriately desired mixing temperature of the air mixture M. changeable to control, preferably by adding a supply of air from the first branch line 3 is throttled and thus reduced. The valve 31 can thus z. B. be a controllable throttle valve.

The first branch line 3 and the second branch line 4th lead to a common line 5 . The common line 5 serves to supply the air mixture M. to the oil separator 20th .

A mixing section 40 serves to form the air mixture M. and thus for mixing air from the first branch line 3 and air from the second branch line 4th .

The mixing sections 40 can e.g. B. have a static mixer and / or comprise at least one screw-shaped, lamellar and / or grid-shaped mixing element. The mixing section 40 can alternatively or additionally z. B. the common line 5 include so that the mixing of air from the first branch pipe 3 and air from the second branch line 4th also in the common line 5 can take place, expediently with or without mixing promoting mixing elements.

In the context of the invention, it is possible to remove charge air both in front of the charge air cooler 10 as well as after the intercooler 10 and mixing of the two charge air flows from the first branch line 3 and the second branch line 4th a (pressure) air flow mixture M. can be achieved with an appropriately desired temperature-controlled mixing temperature. The mixing temperature can preferably be achieved by throttling the front of the charge air cooler 10 extracted charge air can be determined. The (pressure) air flow mixture generated by the mixing and thus tempered M. can then operate the oil separator that works with compressed air support 20th be used.

The invention is not restricted to the preferred embodiments described above. Rather, a large number of variants and modifications are possible which also make use of the inventive concept and therefore fall within the scope of protection. In addition, the invention also claims protection for the subject matter and the features of the subclaims regardless of the features and claims referred to.

List of reference symbols

1

first line, preferably for warm air, especially charge air

2

second line, preferably for cold air, especially charge air

3

first branch line, preferably for warm air, especially charge air

4th

second branch line, preferably for cold air, in particular charge air

5

common line

10

Intercooler

20th

Oil separator, preferably oil mist separator

30th

Throttling point

31

controllable valve

40

Mixing section

50

Compressed air generating device, preferably a compressor

M.

Air mixture, in particular air flow mixture

Claims (15)

Device (100) for a particularly charged and / or charge air-cooled internal combustion engine, preferably for providing a temperature-controlled compressed air mixture for a compressed air-assisted oil separator (20), preferably for blow-by gases, with: - a charge air cooler (10), - a first line (1) upstream of the charge air cooler (10), wherein the first line (1) is preferably designed to carry warm air, - a second line (2) downstream of the charge air cooler (10), preferably the second line (2) for Guiding cold air is formed, and - an oil separator (20), preferably an oil mist separator, characterized in that a first branch line (3) branches off from the first line (1) and a second branch line (4) from the second line (2) goes off in order to supply the oil separator (20) with an air mixture (M) composed of air from the first line (1) and air from the second line (2). Device (100) according to Claim 1 , characterized in that the air mixture (M) contains less air from the first line (1) than air from the second line (2). Device (100) according to Claim 1 or 2 , characterized in that the first branch line (3) has an at least partially smaller passage cross section than the second branch line (4), so that the air mixture (M) preferably contains less air from the first line (1) than air from the second line ( 2). Device (100) according to one of the preceding claims, characterized in that the first branch line (3) has a throttle point (30). Device (100) according to one of the preceding claims, characterized in that the device (100) has a controllable valve (31) in order to variably control the composition and thus the mixing temperature of the air mixture (M). Device (100) according to Claim 5 , characterized in that the valve (31) - is formed in the first branch line (3), and / or - is designed to throttle a supply of air from the first branch line (3). Device (100) according to one of the preceding claims, characterized in that the device (100) comprises a mixing section (40) for forming the air mixture (M) and thus for mixing air from the first branch line (3) and air from the second Branch line (4). Device (100) according to Claim 7 , characterized in that the mixing section (40) has a preferably static mixer and / or comprises at least one screw-shaped, lamellar or grid-shaped mixing element. Device (100) according to one of the preceding claims, characterized in that the air mixture (M) is a compressed air mixture, preferably a pre-compressed charge air mixture. Device (100) according to one of the preceding claims, characterized in that the air is compressed air and / or pre-compressed charge air. Device (100) according to one of the Claims 5 to 10 , characterized in that the device (100) comprises a control device for controlling the valve (31) and preferably for controlling the internal combustion engine. Device (100) according to one of the preceding claims, characterized in that the first branch line (3) and the second branch line (4) lead to a common line (5), the common line (5) for supplying the air mixture (M) to the oil separator (20). Device (100) according to one of the preceding claims, characterized in that the internal combustion engine is connected to the charge air cooler (10) for recooling pre-compressed charge air. Motor vehicle, preferably commercial vehicle, with an internal combustion engine and a device (100) according to one of the preceding claims, wherein charge air can be fed to the internal combustion engine via the charge air cooler (10) and preferably the second line (2). Method for operating a device (100) for a particularly charged and / or charge air-cooled internal combustion engine, preferably for providing a temperature-controlled compressed air mixture for a compressed air-assisted oil separator (20), preferably for blow-by gases, preferably after a device (100) one of the Claims 1 to 13th , with: - a charge air cooler (10), - a first line (1) upstream of the charge air cooler (10), the first line (1) preferably being designed to carry warm air, - a second line (2) downstream of the charge air cooler ( 10), wherein the second line (2) is preferably designed to carry cold air, and - an oil separator (20), preferably an oil mist separator, characterized in that a first branch line (3) branches off from the first line (1) and from a second branch line (4) branches off the second line (2) and the oil separator (20) is supplied with an air mixture (M) composed of air from the first line (1) and air from the second line (2).

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