DE102018005564A1 - Actuating device for actuating a valve element of an internal combustion engine - Google Patents

Abstract

The invention relates to an actuating device (10) for actuating a valve element of an internal combustion engine, with a housing (12) which has a working space (14), and with an elastic membrane (16) arranged in the working space (14), through which the Working space (14) is divided into two spaces (18, 20), comprising: at least one inlet (30) assigned to one of the spaces (18, 20), via which cooling air, with which the membrane (16 ) can be acted upon directly into a room (18, 20); and at least one outlet (32) assigned to the one room (18, 20), provided in addition to the inlet (30) and spaced apart from the inlet (30), via which outlet during the introduction of the cooling air into the one room (18, 20) the cooling air introduced into the one space (18, 20) via the inlet (30) can be removed from the one space (18, 20).

Description

The invention relates to an actuating device for actuating a valve element of an internal combustion engine according to the preamble of claim 1.

Such an actuating device for actuating a valve element of an internal combustion engine, in particular a motor vehicle, is already the example DE 20 2013 103 608 U1 as known. The actuating device has a housing which has or delimits a working space. In addition, the actuating device comprises an elastic, that is to say elastically deformable, membrane which is arranged in the working space and through which the working space is divided into a first space and a second space.

Furthermore, the DE 10 2013 008 686 A1 a switching intake manifold with a housing forming at least one flow channel and at least one control element influencing a gas flow in the flow channel and / or changing the flow channel, and an actuating device for actuating the control element. It is provided that the actuating device comprises an electropneumatic pressure converter.

Furthermore, from the DE 10 2015 117 174 A1 a cooling device for a turbocharger actuator is known.

The object of the present invention is to further develop an actuating device of the type mentioned at the outset in such a way that a particularly long useful life of the actuating device can be achieved.

This object is achieved by an actuating device with the features of patent claim 1. Advantageous refinements with expedient developments of the invention are specified in the remaining claims.

In order to further develop an actuating device of the type specified in the preamble of patent claim 1 such that a particularly long useful life of the actuating device can be achieved, in particular without having to maintain or repair the actuating device, the invention provides that the actuating device, in particular the housing, has at least one has an inlet assigned to the rooms, via which cooling air can be introduced into the one room. To cool the membrane, the membrane can be acted upon directly by the cooling air introduced into the one room via the inlet. This means that the cooling air introduced into the one space via the inlet can flow directly against the membrane and thus touch or contact it directly, so that the membrane can be cooled particularly advantageously by means of the cooling air.

Furthermore, the actuating device, in particular the housing, has at least one outlet, which is assigned to the room and is provided in addition to the inlet and spaced apart from the inlet, via which outlet the air introduced into the one room is introduced via the inlet into the one room Air can be removed from one room. In other words, cooling air can simultaneously flow into the one room via the inlet and flow out of the one room via the outlet, so that, for example, an at least essentially continuous cooling air flow comprising the cooling air can be realized through the one room. The cooling air flow can cool the membrane particularly advantageously. In other words, a particularly advantageous heat removal from the membrane can be ensured by the cooling air flow, so that excessively high temperatures and thus an undesirably rapid thermal aging, overstressing or damage to the membrane and thus to the actuating device as a whole can be avoided.

Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawing. The features and combinations of features mentioned above in the description and the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the combination indicated in each case, but also in other combinations or on their own, without the scope of Leaving invention.

• 1 ausschnittsweise eine schematische und geschnittene Seitenansicht einer erfindungsgemäßen Stelleinrichtung gemäß einer ersten Ausführungsform zum Betätigen eines Ventilelements einer Verbrennungskraftmaschine; und
• 2 ausschnittsweise eine schematische und geschnittene Seitenansicht der Stelleinrichtung gemäß einer zweiten Ausführungsform.

The drawing shows in:

• 1 Detail of a schematic and sectional side view of an actuating device according to the invention according to a first embodiment for actuating a valve element of an internal combustion engine; and
• 2 excerpts a schematic and sectional side view of the actuating device according to a second embodiment.

Identical or functionally identical elements are provided with the same reference symbols in the figures.

1 shows a detail in a schematic and sectional side view of a first embodiment of an actuating device 10 to the Actuation of a valve element of an internal combustion engine, in particular a motor vehicle. The motor vehicle is designed, for example, as a motor vehicle, in particular as a passenger car, and can be driven by means of the internal combustion engine. The valve element is, for example, a so-called waste gate, which is also referred to as a waste gate valve and is used to set a boost pressure of an exhaust gas turbocharger. The waste gate valve can be designed by means of the actuating device, which is also referred to as a pressure cell or as a pressure cell, in particular as a vacuum box or as a pressure cell 10 moved to different positions and held in different positions, for example. Furthermore, it is conceivable that the valve element is an exhaust gas recirculation valve (EGR valve), for example by means of the adjusting device 10 A quantity of exhaust gas is set via the valve element, which is returned from an exhaust tract to an intake tract of the internal combustion engine and introduced into the intake tract. The valve element is thus used, for example, to set a hot gas flow, in particular to regulate or meter it. As will be explained in more detail below, the actuating device is 10 designed as a membrane box, in particular as a ventilated membrane box. In particular, the actuator 10 designed as a pneumatic actuator, in particular as a pneumatic exhaust gas turbocharger actuator or as a pneumatic EGR actuator.

The actuator 10 has a housing 12 on what a work space 14 has or limited. The actuator 10 also includes one in the work space 14 arranged and elastic, that is elastically deformable membrane 16 through which the work space 14 in two opposite and through the membrane 16 separate rooms. A first of the rooms is a work chamber 18 , and the second room is an operating rod room 20 , The Chamber of Labor 18 is on a first page 22 the membrane 16 arranged, the actuating rod space 20 on a first page 22 facing second side 24 the membrane 16 is arranged. The membrane 16 limits the working chamber 18 or the actuating rod space 20 partly directly or directly, the working chamber 18 or the actuating rod space 20 partly through the membrane 16 and partly through the case 12 is limited.

The actuator 10 also includes an operating rod 26 , which is also referred to as a control or regulating rod. The operating rod 26 is with the membrane 16 coupled and thus by elastic deformation of the membrane 16 along an in 1 with a double arrow 28 illustrated direction of movement translationally relative to the housing 12 movable. The membrane 26 is coupled to the valve element, for example, so that it extends along the direction of movement and relative to the housing 12 translational movement of the actuating rod 26 the valve element can be moved into the different positions. Overall, it can be seen that the housing 12 is designed like a can or is also referred to as a can, so that the adjusting device 10 is designed as a membrane box or as a pressure box. The membrane 16 can in particular be elastically deformed in that an actuating fluid such as air, in particular compressed air, into the working chamber 18 and / or the operating rod space 20 is initiated.

In order to achieve an undesirably rapid thermal aging, overstressing or damage to the actuating device 10 , especially the membrane 16 to avoid and thus a particularly long service life of the actuating device 10 to be able to implement, in particular without the actuating device 10 servicing or repair, the control device 10 , in particular the housing, an inlet through which cooling air can flow 30 on which at the in 1 shown embodiment of the working chamber 18 assigned. About the entrance 30 can the entrance 30 Cooling air flowing through into the working chamber 18 be introduced, the cooling air the membrane 16 , especially the page 22 the membrane 16 , can flow directly and thus touch directly. This allows the membrane 16 by means of in the working chamber 18 initiated and the Chamber of Labor 18 cooling air flowing through can be cooled effectively and efficiently. The cooling air, especially its flow through the inlet 30 , to the working chamber 18 , through the Chamber of Labor 18 and from the working chamber 18 out is in 1 illustrated by arrows.

Furthermore, the control device 10 , especially the housing 12 at least one of the labor chamber 18 assigned, in addition to the inlet 30 provided and from the inlet 30 spaced outlet 32 on what during the about the inlet 30 the cooling air is introduced through the inlet 30 to the work chamber 18 Cooling air introduced from the working chamber 18 is dissipatable. In other words, cooling air can flow through the inlet at the same time 30 to the work chamber 18 flow in and through the outlet 32 from the Chamber of Labor 18 flow out, so that an at least substantially continuous flow of cooling air through the working chamber 18 can be realized through. The cooling air flow can cross the membrane 16 on the website 22 inflow directly, making a special advantageous heat dissipation from the membrane 16 can be guaranteed. This can cause excessive membrane temperatures 16 be avoided.

In the first embodiment, the housing has 12 one on the actuating rod space side 20 ordered execution 34 on which of the operating rod 26 is permeated. In the first embodiment, the implementation is 34 the operating rod space 20 assigned and from the inlet 30 and from the outlet 32 spaced and thus in addition to the inlet 30 and in addition to the outlet 32 intended. The implementation 34 penetrating actuating rod 26 can thus start from the membrane 16 and in particular starting from the actuating rod space 20 by performing 34 through and subsequently to an outside of the work space 14 arranged environment 36 the actuating device 10 extend.

At the in 1 The first embodiment shown is the inlet 30 as a supply connection 38 formed, via which the cooling air designed as actuating fluid, by means of which to actuate the valve element, the membrane 16 elastically deformable and thereby the operating rod 26 translationally relative to the housing 12 is movable into the working chamber 18 can be initiated. 2 shows a second embodiment of the actuating device 10 , In the second embodiment, the inlet is 30 the operating rod space 20 assigned so that also in 2 through the in 2 The arrows shown illustrated cooling air through the inlet 30 in the operating rod area 20 can be initiated or is initiated. Accordingly, the outlet is also 32 the operating rod space 20 assigned. Here is the supply connection 38 from the inlet 30 and from the outlet 32 spaced and in addition to the inlet 30 and in addition to the outlet 32 intended. However, it is provided in the second embodiment that the outlet 32 than performing 34 is trained. In the first embodiment, the inlet comes 30 hence a dual function as the inlet 30 on the one hand is used to bring the cooling air into the working chamber 18 initiate. The entrance 30 is also used as a supply connection 38 used the actuating fluid in the working chamber 18 initiate. In the first embodiment, the cooling air also has a double function, since the cooling air is used on the one hand to cool the membrane 16 and on the other hand for elastic deformation of the membrane 16 is used.

In the second embodiment, the outlet comes 32 a dual function too since the outlet 32 on the one hand is used to pass through the inlet 30 in the operating rod area 20 cooling air introduced from the operating rod space 20 auszuleiten. The other is the outlet 32 than performing 34 used. In the second embodiment, the actuating fluid can be a fluid that is different from the cooling air, so that, for example, the cooling air can have a significantly lower temperature than the actuating fluid.

For example, the valve element is designed as a poppet valve. A desired target path of the actuating rod, also simply referred to as a rod 26 is realized for example by a negative or positive pressure, which is in the working chamber 18 or in the operating rod space 20 is effected. The actuating fluid is provided, for example, by an electropneumatic converter, or the actuating device 10 or the valve element is designed to be self-regulating, so that the actuating fluid is, for example, air which is compressed by means of the exhaust gas turbocharger.

The adjusting device is usually used 10 and thus in particular the membrane 16 exposed to a hot working environment and thus heat radiation from hot exhaust gas-carrying parts and / or high engine compartment temperatures, which increases the service life of the actuating device 10 , especially the membrane 16 , can influence. Now that the membrane 16 Excessively high temperatures of the membrane can be cooled in a particularly simple manner and directly by means of the cooling air 16 be avoided. Overall, it can be seen that there is effective cooling of the membrane 16 represented by the cooling air flow described, which, for example, in the working chamber 18 and / or the operating rod space 20 is initiated and the Chamber of Labor 18 and / or the operating rod space 20 flows through.

In the first embodiment, for example, the membrane is pressurized by the actuating fluid 16 the cooling air flow described, which passes through at least one or more outlet openings, in particular through the outlet 32 , also known as the diaphragm chamber 18 leave again and subsequently the membrane 16 can cool. The outlet opening or the outlet 32 can be designed, for example, as a bore, in particular as an exit bore.

The outlet preferably has 32 a nozzle or a throttle to limit or throttle the cooling air flow, in particular its volume or mass flow, so that the main function of the actuating device is impaired 10 regarding the movement of the operating rod 26 can be avoided.

In the second embodiment, it is provided that a rear side of the membrane 16 about the entrance 30 and the outlet 32 with air, that is flushed with the cooling air, for example in the actuating rod space 20 at least almost the existing ambient pressure is maintained. This can prevent the main function from being influenced. If, for example, the cooling air is removed as purge air from a pressure accumulator of the internal combustion engine or motor vehicle, which is also referred to as a motor, the pressure accumulator being designed as a brake boiler, for example, the described process can also be carried out in the case of a so-called reheating, that is to say when the component temperature rises immediately after the internal combustion engine is deactivated Cooling the membrane 16 be kept active. For example, by means of a bi-metal control, the two embodiments can also be adapted in such a way that the described temperature reduction function is only activated when necessary.

An overpressure or underpressure accumulator is usually used as the source for the membrane 16 deform elastically. For example, the aforementioned electro-pneumatic transducer, which has at least a partial pressure to act on the membrane, is connected in series with the source 16 and ultimately the movement of the operating rod 26 provides. The converter is clocked, for example, via an engine control unit, as required. Since in the first embodiment, the actuating fluid through the outlet 32 at least partly out of the Chamber of Labor 18 can flow out, there is a loss volume flow that over the outlet 32 from the Chamber of Labor 18 flows out. This loss volume flow can be compensated by suitable parameterization in the engine control unit, so that, for example, a control behavior can be set as if there was no loss volume flow or if the actuating fluid did not flow through the outlet 32 from the Chamber of Labor 18 could flow out. This is done analogously for EGR valves, for example. In the case of a self-regulating exhaust gas turbocharger or in the case of a self-regulating actuating device 10 the membrane is acted upon 16 boost pressure generated by the exhaust gas turbocharger itself, so that no electropneumatic converter is present or used. Here, too, the loss volume flow described above can occur, which, however, is extremely low in relation to the air delivery rate for the internal combustion engine and thus cannot interfere with the main function of the self-regulation, in particular when the outlet 32 or one through the outlet 32 formed opening through which the actuating fluid from the working chamber 18 can flow out, is limited by means of a nozzle or throttle.

LIST OF REFERENCE NUMBERS

10

setting device

12

casing

14

working space

16

membrane

18

working chamber

20

Actuating rod space

22

page

24

page

26

actuating rod

28

double arrow

30

inlet

32

outlet

34

execution

36

Surroundings

38

supply terminal

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 202013103608 U1 [0002]
• DE 102013008686 A1 [0003]
• DE 102015117174 A1 [0004]

Claims (6)

Actuating device (10) for actuating a valve element of an internal combustion engine, with a housing (12) which has a working space (14) and with an elastic membrane (16) arranged in the working space (14) through which the working space (14) divided into two rooms (18, 20), characterized by : - at least one inlet (30) assigned to one of the rooms (18, 20), via which cooling air, with which the membrane (16) is used to cool the membrane (16) directly can be acted upon, into which a space (18, 20) can be introduced; and - at least one outlet (32) assigned to the one space (18, 20), provided in addition to the inlet (30) and spaced apart from the inlet (30), via which outlet during the introduction of the cooling air into the one space (18, 20 ) cooling air introduced into the one space (18, 20) via the inlet (30) can be removed from the one space (18, 20). Actuator (10) after Claim 1 , characterized by at least one supply connection (38) assigned to a first of the spaces (18, 20), in addition to the inlet (30) and in addition to the outlet (32) and spaced apart from the inlet (30) and from the outlet (32) ), via which an actuating fluid, by means of which the membrane (16) can be elastically deformed to actuate the valve element, can be introduced into the first space (18). Actuator (10) after Claim 1 , characterized in that the inlet (30) is designed as a supply connection (38), via which the cooling air designed as actuating fluid, by means of which the membrane (16) can be elastically deformed to actuate the valve element, can be introduced into the one space (18) , Actuating device (10) according to one of the preceding claims, characterized in that the housing (12) has a passage (34) which is penetrated by an actuating rod (26) which is coupled to the membrane (16) and which is deformed by elastic deformation of the membrane ( 16) is translationally movable. Actuator (10) after Claim 4 , characterized in that the outlet (32) is designed as the passage (34). Actuator (10) after Claim 4 , characterized in that the outlet (32) is provided in addition to the bushing (34) and is spaced from the bushing (34).

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