DE102013204018A1 - Control device for a motor vehicle - Google Patents

Abstract

The invention relates to a control device for a motor vehicle, in particular for a transmission control of a motor vehicle, comprising a carrier substrate (200) for an electronic module (400) and a cover (300) fixed on the carrier substrate (200), the carrier substrate (200) and the Cover (300) enclose an electronics compartment (302), the carrier substrate (200) in the electronics compartment (302) having a mounting area (215) for the electronics module (400) and an edge area (230) surrounding the mounting area (215), the edge area (215) has a first surface (204) facing the electronics compartment (302). In order to protect the electronic module (400) permanently and reliably against functional impairments as a result of contact with liquid, in particular oil, in particular in the temperature range from −40 ° C. to + 160 ° C., the first surface (204) at least one sharp edge (208) is formed within the electronics space (302), the at least one sharp edge (208) being formed by the intersection of the first surface (204) with a second surface (206) substantially perpendicular thereto, the Edge sharpness of the at least one sharp edge (208) is configured such that the at least one sharp edge (208) forms a liquid barrier which counteracts the penetration of a liquid film from the edge area (230) in the direction of the electronics module (400).

Description

State of the art

The present invention relates to a control device for a motor vehicle, in particular for a transmission control of a motor vehicle, having the features of the independent device claim.

Known automatic transmissions for vehicles often have, in addition to conventional mechanical components, also sensors and actuators in order to be able to detect a specific transmission state on the one hand and to influence the operation of the transmission on the other hand. Corresponding sensors and actuators are connected to control units, in particular to transmission control units, and in particular to electronic modules in control units or in transmission control units.

Such control devices and the electronic modules arranged therein can also be provided directly in the transmission. As a result, these control units are exposed to direct contact with the transmission oil and other aggressive transmission fluids as well as high thermal and mechanical loads. In order to protect the sensitive electronics of the electronic modules permanently and safely against destruction by penetrating gear oil or aggressive gear fluid, the control units for use in the transmission are usually specially designed. In particular, such control devices are designed so that the penetration of gear oil or the transmission fluid is permanently and safely prevented as completely as possible in all operating conditions.

From the DE 198 59 739 A1 is a generic control unit known. The control device comprises a carrier substrate for an electronics module and a lid fixed on the carrier substrate, the carrier substrate and the lid enclosing an electronics compartment.

Disclosure of the invention

Advantages of the invention

According to the invention, a control device for a motor vehicle, in particular for a transmission control of a motor vehicle, is proposed which comprises the following components: a carrier substrate for an electronic module and a lid fixed on the carrier substrate, wherein the carrier substrate and the lid enclose an electronics compartment, the carrier substrate in the electronics compartment a mounting region for the electronic module and an edge region surrounding the mounting region, wherein the edge region has a first surface facing the electronics chamber. According to the invention, at least one sharp edge is formed on the first surface within the electronics compartment, the at least one sharp edge being formed by the section line of the first surface having a second surface substantially perpendicular thereto, the edge sharpness of the at least one sharp edge being configured in such a way that in that the at least one sharp edge forms a liquid barrier, which counteracts the penetration of a liquid film from the edge region in the direction of the electronic module.

Compared to the prior art, the control device for a motor vehicle, in particular for a transmission control of a motor vehicle, with the features of the independent device claim 1 has the advantage that the electronic module particularly reliable and safe against liquid films, especially oil films, especially in the temperature range of -40 ° C to + 160 ° C as present in the liquid state, media is protected. In such transmission controls liquid films can infiltrate the sealing points between the lid and carrier substrate by capillary action or by diffusion in small quantities. They can then penetrate as liquid film on the first surface of the carrier substrate in the direction of the electronic module, in particular creeping. Particularly advantageously, a particularly cost-effective and easy to produce liquid barrier is realized by the invention, which permanently ensures the functionality of the electronic module. The liquid barrier advantageously utilizes the physical effect of the so-called edge escape in order to counteract the penetration of the liquid film in the direction of the electronic module.

Advantageous embodiments and further developments of the invention are made possible by the measures specified in the dependent claims.

Because the edge dimension of the at least one sharp edge is 50 microns or less, in particular 20 microns or less, a liquid film, in particular an oil film, especially in the temperature range of -40 ° C to + 160 ° C, particularly reliable at the sharp Retained edge and prevented from penetrating in the direction of the electronic module. Such a sharp edge formed causes a particularly high expression of the physical effect of the edge escape, which causes the liquid film at this edge undergoes a curved surface and thus initially stopped at the edge of the edge and thus does not overflow the edge.

Characterized in that the edge sharpness of the at least one sharp edge is formed such that the surface energy of the first surface at the at least one sharp edge changed so abruptly that a liquid film, in particular an oil film, at the at least one sharp edge entenden behavior shows is advantageously effected that the liquid film is reliably stopped at the edge of the edge and not further in the direction of the electronic module can spread.

Due to the abrupt change in the surface energy of the first surface at the at least one sharp edge, wherein the surface energy of the first surface at the at least one sharp edge preferably abruptly greatly reduced, is caused by the thermodynamic effect that the surface energy of the liquid film tends to a minimum in that the liquid film exhibits entangling behavior at the sharp edge with the abrupt reduction in surface energy occurring there.

Dewetting behavior means that the liquid of the liquid film on the first surface in the region of the sharp edge bulges, preferably strongly bulges, wherein the contact angle between the surface of the liquid film and the first surface is in the range of 90 °, and preferably greater than 90 ° becomes. This phenomenon, which forms a curved surface of the liquid film in the region of the sharp edge, is referred to as edge escape. In this case, the surface tension of the liquid film causes a minimization of the surface of the liquid film and causes the liquid is displaced in the direction of the flat surface of the first surface. In the area of the edge, the layer thickness increases up to a bead formation.

In an advantageous development of the invention, it is provided that a groove is introduced into the first surface, wherein the groove has a first groove wall facing away from the electronics module and a second groove wall facing the electronics module. On an imaginary straight line in the first surface, which starts from the electronic module and extends toward the cover and thereby cuts the groove, the first groove wall thus lies closer to the electronics module than the second groove wall. The first groove wall can thus be referred to as a groove inner wall, the second groove wall as a groove outer wall. This refinement advantageously has the effect that the advance of a liquid film, in particular an oil film, is counteracted by lengthening the path length and thus the creepage distance for the liquid film on the first surface in the direction of the electronic module. This advantageously increases the area over which the liquid film can be distributed, as a result of which the liquid film can be bound more easily to the first surface or into the groove. In addition, the groove advantageously forms a type of liquid reservoir, similar to a moat. As a result, even larger amounts of liquid or liquid films, which move not only by capillary forces on the electronic module, are prevented from penetrating in the direction of the electronic module.

The fact that the groove rotates around the electronic module advantageously has the effect that the liquid barrier formed by the groove protects the electronic module from the penetration of a liquid film in a particularly reliable manner. Particularly advantageous can be by a circumferential groove, in particular by the electronics module completely and in particular ring-like closed circumferential groove, even larger amounts of liquid safely stop against the advance to the electronics module out. For a liquid film penetrated into the groove preferably fills up the groove serving as a liquid reservoir. In addition, the liquid film can be distributed along the bottom of the groove and thus diluted in its strength by the capillary forces. It is particularly advantageous that a circumferential groove ensures that there is no single planar creepage distance from the cover to the electronics module on the first surface, so that a propagation of a liquid film in the direction of the electronics module is counteracted particularly effectively by this structural measure.

The fact that the at least one sharp edge is formed by a cutting line between the first surface and the second groove wall, wherein the second groove wall as the second surface is substantially perpendicular to the first surface, is advantageously achieved that a penetration of the liquid film, in particular a Oil film is counteracted in the direction of the electronic module at a particularly far away from the electronics module body. Furthermore, it is advantageously effected that, in the event of this sharp edge being exceeded, the advance of the liquid film from the groove located immediately behind the sharp edge, which serves as a liquid reservoir and lengthens the creep path for the liquid film, can be counteracted further.

Characterized in that the at least one sharp edge is formed by a line of intersection between the first surface and the first groove wall, wherein the first groove wall as the second surface is substantially perpendicular to the first surface, is advantageously causes liquid, which in the groove has been stopped by the sharp edge, which is formed by the first groove wall as a second surface and the first surface, stopped and prevented from further creeping toward the electronic module.

A development of the invention provides that a recess having a recess inner wall is introduced into the carrier substrate, wherein the mounting area is arranged in the recess and that the at least one sharp edge is formed by a cutting line between the first surface and the recess inner wall wherein the recess inner wall as the second surface is substantially perpendicular to the first surface. This advantageously has the effect that the electronic module can be mounted in the recess and can be easily electrically contacted with the first surface of the carrier substrate, for example by the use of bonding wires. Furthermore, it is advantageously brought about that the advance of a liquid film in the direction of the electronic module is counteracted by the sharp edge of the recess inner wall by means of the effect of the edge escape. In addition, the creepage distance for the liquid film towards the electronic module is advantageously lengthened by the recess inner wall. By providing a recess can also be advantageous particularly simple and inexpensive directly in the production of the recess produce a sharp edge on the first surface, without an additional process step is necessary.

The terms "edge", "sharp edge" and "edge dimension" used in this application are analogous to the ISO standard " ISO 13715: 2000 "(December 2000 edition).

The term "edge" is thus understood in the context of this application, the intersection of two surfaces. The second surfaces of the recess inner wall, the first groove wall and the second groove wall described in this application are formed as substantially planar surfaces and they are all substantially perpendicular to the first surface of the edge region. With the planar first surface of the edge region, they therefore each form an edge along their section line with the first surface of the edge region.

In this case, in the intersection region of the two intersecting surfaces are basically unavoidable deviations from the ideal geometric planar surface, which can occur at the edge formed by the two surfaces, for example, small burrs or erosion in the form of fillets or bevels even if by the cutting edge formed edge is to be regarded as a sharp edge.

Under a "sharp edge" in the context of this application is referring to the ISO 13715: 2000 the following embodiment of an edge between two intersecting surfaces understood: The first surface has in the region of the edge on a first planar surface, which spans a first plane. The second surface has in the region of the edge a planar second surface which spans a second plane. The first level and the second level intersect along a geometric cut line. In a cross-sectional plane perpendicular through the intersecting first and second planes and therefore also perpendicular to the geometric intersection line, the contour of the edge has a first measure (a1) and a second measure (a2), which together define an "edge dimension". The first measure of length (a1) is defined by the length of a course of the contour of the edge deviating from an ideal right-angled course from its deviation point from the first plane to the geometric section line. The second measure of length (a2) is defined by the length of a contour deviating from an ideal right-angled profile of the contour of the edge from its point of deviation from the second plane to the geometric section line. The first length dimension (a1) and the second length dimension (a2) (and thus also the edge dimension) are for a "sharp edge" in the meaning of the application 50 micrometers or less in each case and in particular 20 micrometers or less.

A development of the invention provides that the carrier substrate is a printed circuit board, wherein at least one conductor track is provided on an inner layer of the printed circuit board, which is electrically connected via a via with a contacting element on the first surface, wherein the contacting element the first surface is disposed between the sharp edge and the mounting portion for the electronic module. This refinement advantageously has the effect that penetration of the liquid film is preferably stopped before the liquid film reaches the contacting element on the first surface of the carrier substrate formed as a printed circuit board. As a result, the contacting element is particularly reliably prevented from corrosion as a result of contact with the liquid film, in particular an oil film or an aggressive transmission fluid.

As a circuit board in the context of the present invention is meant a signal and / or power distribution component. These include, in particular, conventional printed circuit boards (PCB) on, for example, epoxy resin (FR4) with, for example, copper conductor tracks on inner and / or outer layers of the printed circuit board and with electrical feedthroughs, which electrically interconnect printed conductors in different layers.

The fact that the electronic module is connected by means of at least one electrical connection element with the contact element, is advantageously causes the electronic module with electrical energy can be supplied or that electrical or electronic signals can be read from the electronic module.

The fact that a seal is arranged between the cover and the carrier substrate advantageously has the effect that the penetration of a liquid film into the electronics compartment is strongly suppressed and the electronics compartment is sealed against penetrating liquid, in particular transmission oil or aggressive transmission fluid. As a result, the amount of liquid which can penetrate into the electronics space is kept to a minimum, which can not be suppressed as a result of diffusion or capillary action.

Brief description of the drawings

Embodiments of the invention

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description.

Show it:

1 a cross section through an inventive control unit,

2 an enlarged detail of the cross section 1 .

3a the enlargement of the cross section of a rounded edge, which forms a sharp edge 2 .

3b the cross section of an edge formed as a ridge, which is formed as a sharp edge, as an enlarged detail 2 ,

1 shows a control unit 100 for a motor vehicle, in particular for a transmission control of a motor vehicle. The control unit 100 includes a carrier substrate 200 for an electronics module 400 and one on the carrier substrate 200 fixed lid 300 wherein the carrier substrate 200 and the lid 300 an electronics room 302 enclose. The carrier substrate 200 points in the electronics room 302 a mounting area 215 for the electronics module 400 and one the assembly area 215 circumferential edge area 230 on. The border area 215 has a the electronics room 302 facing first surface 204 on.

The carrier substrate 200 is on a support plate 110 mounted, which is preferably formed of aluminum with a plate thickness of 3 to 4 mm.

On the carrier substrate 200 is the lid 300 by means of a preferably circumferential seal 310 , For example, in the form of a bead of adhesive or O-ring tightly fixed. The attachment of the lid 300 on the carrier substrate 200 is preferably carried out by at least one fastener 120 which the lid 300 , the carrier substrate 200 and the carrier plate 110 passes through and squeezes. The at least one fastening element 120 is particularly preferably designed as a rivet or screw.

The carrier substrate 200 is preferably designed as a printed circuit board or a printed circuit board (PCB). On the electronics module 400 are electrical or electronic components 410 (For example, custom integrated circuits (ASIC)), passive devices 420 For example, resistors, capacitors or coils, and electronic module contact elements 440 arranged. The electronics module 400 is in the illustrated embodiment in a recess 210 of the carrier substrate 200 assembled. The recess 210 has a recess floor 218 and a circumferential recess inner wall 212 on. The electronics module is on the recess floor 218 preferably by means of an adhesive 402 glued. The adhesive 402 may be an electrically conductive adhesive or an electrically non-conductive adhesive. The adhesive 402 may in one embodiment on the recess bottom 218 be dispenst In another embodiment, the adhesive is 402 designed as a double-sided adhesive tape.

The carrier substrate formed as a printed circuit board 200 points in its edge area 230 one in the first surface 204 introduced groove 220 on that completely in the electronics room 302 is arranged. The groove preferably rotates in the recess 210 arranged electronic module 400 , The groove 220 has a preferably rectangular cross section with one of the electronics module 400 remote first groove wall 222 and a second groove wall facing the electronic module 224 , The first groove wall 222 and the second groove wall 224 are as substantially perpendicular to the first surface 204 formed trained surfaces. The first groove wall 222 is preferred as a second surface 206 formed, which with the first surface 204 forms a cutting line, wherein this cutting line has a first groove edge 228 forms, preferably as a sharp edge 208 is trained. The second groove wall 224 is as another second surface 206 to look at, which with the first surface 204 forms a cutting line, wherein the cutting line as a second groove edge 226 is trained and also prefers a sharp edge 208 forms. Also the recess inside wall 212 preferably forms another second surface 206 out, which with the first surface 204 forms a cutting line, wherein the cutting line is a recess inner wall edge 214 forms, wherein the recess inner wall edge 214 also prefers a sharp edge 208 formed.

In other, not shown, embodiments of the invention, it is possible that no groove 220 is provided and that the sharp edge 208 exclusively on the recess inside wall edge 214 is present. An embodiment is also conceivable in which the carrier substrate 200 no recess 210 but only one groove 220 , wherein the first groove edge 228 and / or the second groove edge 226 as sharp edges 208 are formed. Again, in another embodiment, in the carrier substrate 200 a recess 210 be provided and a groove 200 , in which case only the first groove edge 228 as a sharp edge 208 is formed or only the second groove edge 226 as a sharp edge 208 is trained. In general, there may be embodiments of the invention in which only one edge is a sharp edge 208 is formed or a plurality of edges are formed as a sharp edge.

The height of the first groove wall 222 and the second groove wall 224 , is preferably more than 200 Micrometer, more preferably between 400 Micrometer and 1200 Micrometers. However, it depends on the thickness of the carrier substrate used 200 also possible that the height of the first groove wall 222 and the second groove wall 224 more than 1200 Microns, limited only by the stability of the carrier substrate at the location of the groove.

The lateral extent of the groove 220 , So its width and thus in particular the distance of the first groove wall 222 from the second groove wall 224 , is preferably more than 200 microns, more preferably between 400 microns and 1200 microns. Depending on which surface the carrier substrate 200 extends and how much space in the edge area 230 is available, the width of the groove may also be more than 1200 microns, for example, 1 cm.

In a further, not shown, embodiment of the invention are along the extension direction of the lid 300 to the electronic module 400 several grooves 220 one behind the other, in a plan so nested, arranged. In particular, two, three or four grooves 220 arranged one behind the other. The width of the grooves 220 and the height of their groove inside walls 222 and groove exterior walls 224 can do this for all grooves 220 be the same, but it can also grooves 220 with different widths and different heights of the groove inner walls 222 and groove exterior walls 224 be provided. As a result, the creepage distance for liquid films is considerably increased and - in cooperation with possible other sharp edges on the grooves 220 - The protection of the electronic module before contact with the liquid film increased particularly strong.

Furthermore, the carrier substrate formed as a printed circuit board comprises 200 preferably between the groove 220 and the recess 210 arranged contacting elements 240 , which each have a via 242 with a conductor track 260 of the carrier substrate 200 are connected, wherein the conductor track 260 is formed in an inner layer of the carrier substrate. The electronics module 400 is by means of an electrical connection element 450 with the carrier substrate 200 connected, wherein the electrical connection element 450 For example, as a bonding wire connection between the contacting element 240 and the electronic module contact element 440 is trained.

In the lid 300 may preferably a lid opening 320 which are with a closure element 322 is closable. The closure element 322 may preferably be in the form of a solderable ball. Through the lid opening 320 can after mounting the lid 300 on the carrier substrate 200 For example, the tightness of the electronics compartment 302 be tested or substances, such as a gel, in the electronics room 302 be filled, the substances preferably one the electronic module 400 have protective effect, in particular against contact with the liquid film. Particularly preferred is the electronic module 400 of a protective substance, in particular a gel, completely enveloped. Likewise, the contacting elements are preferred 240 completely covered by a protective substance, in particular a gel.

By diffusion processes or the capillary effect, it may happen in the worst case that small amounts of outside the control unit 100 adjacent medium, in particular a liquid, such as transmission oil, transmission fluid or the like, under the seal 310 through into the electronics room 302 arrives. The penetration direction of this fluid present as liquid film along the first surface 204 is through the lid 300 indicated inwardly directed arrows. In particular, the liquid film is a thin film of oil or a film of transmission fluid, which at the usual operating temperatures of the control unit 100 , ranging from -40 ° C to + 160 ° C, preferably having the properties of a liquid. The penetration of such a liquid film is characterized by the sharp edge 208 trained second groove edge 226 stopped or disabled. If there is too much liquid on the second groove edge 226 and thus the liquid film flows over the edge, so does the groove 220 another liquid barrier against the penetration of the liquid or the Liquid film in the direction of the electronic module 400 because through the groove 220 the creepage distance for the liquid film is lengthened, at the same time the groove acts 220 as a kind of liquid reservoir for receiving the liquid of the liquid film and for its distribution in the groove 220 , Is this fluid reservoir in the form of the groove 220 the liquid film, driven by capillary forces or diffusion forces, expands or penetrates further in the direction of the electronic module 400 before, so forms the first groove edge 228 , which as a sharp edge 208 is formed, a further liquid barrier, which inhibits the penetration of the liquid film in the direction of the electronic module. Through the groove 220 and their preferred as sharp edges 208 formed first groove edge 228 and second groove edge 226 is preferably also the contact element 240 protected from contact with the liquid and corrosion induced by the contact. The liquid film overcomes this, a liquid barrier performing, groove 220 so it forms as a sharp edge 208 formed recess inner wall edge 214 another liquid barrier, where the liquid film is stopped. Through all these constructive measures, which may be present both individually and together, in a particularly simple and cost-effective manner, a particularly high and reliable protection of the electronic module 400 guaranteed before a liquid film, which otherwise unhindered on the first surface 204 from the lid 300 to the electronics module 400 could penetrate.

In 2 is an enlarged section of the embodiment of 1 shown, wherein the cutout on the carrier substrate 200 refers. 2 shows that the recess inner wall 212 prefers a right angle 280 with the surface of the recess floor 218 forms. The recess inner wall 212 is preferred as a second surface 206 configured, which preferably perpendicular to the first surface 204 cuts. In the illustrated cross section, this is at right angles 280 between the recess inner wall 212 and the first surface 204 indicated. In the intersection between the recess inner wall 212 and the first surface 204 the cut edge forms a contour which has the first length dimension (a1) and the second length dimension (a2), which together define the edge dimension. The first length measure (a1) and the second length measure (a2) have been further defined above. So that the recess inner wall edge 214 as a sharp edge 208 can act, the edge dimension, ie, both the first length dimension (a1) and the second length dimension (a2), each less than 50 microns, preferably less than 20 microns, configured. This can be done by suitable manufacturing processes in the preparation of the recess 210 be effected. In particular, laser cutting processes, milling processes, a water jet cutting process or an etching process come into question.

Likewise, the first groove edge 228 and / or the second groove edge 226 each as a sharp edge 208 formed, wherein also at the first groove edge 228 and the second groove edge 226 the first length dimension (a1) and the second length dimension (a2) are each less than 50 micrometers, preferably less than 20 micrometers. Preferred production processes for the groove 220 or the plurality of grooves are the same as in the recess 210 the milling, the laser cutting, the water jet cutting or the etching out of the groove of the material of the carrier substrate 200 , The groove 220 However, it can also be scratched into the first surface 204 be introduced. Particular attention is paid to the design of the recess inner wall edge 214 , the first groove edge 228 and the second groove edge 226 such that these edges are preferred as sharp edges 208 be executed.

In the 3a and 3b Two embodiments of a liquid barrier sharp edge are shown, in this case through the recess inner wall 212 with the first surface 204 is formed. In 3a is a sharp edge 208 shown in the true sense, with the sharp edge 208 Compared to an ideal geometric edge has a rounding on the edge contour with the first length dimension (a1) and the second length dimension (a2). In 3b is also a burr acting as a liquid barrier, wherein in this ridge, the first length dimension (a1) can not be defined, since only the recess inner wall 212 as a second surface 206 in the intersection with the first surface 204 deviates from the ideal geometric shape. So that the recess edge 214 as a sharp edge 208 can act, is the edge dimension, ie in 3a the first length dimension (a1) and the second length dimension (a2) each less than 50 microns, preferably less than 20 microns, designed and in 3b the second length dimension (a2) is less than 50 micrometers, preferably less than 20 micrometers.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely 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.

Cited patent literature

• DE 19859739 A1 [0004]

Cited non-patent literature

• ISO 13715: 2000 [0017]
• ISO 13715: 2000 [0020]

Claims (11)

Control device for a motor vehicle, in particular for a transmission control of a motor vehicle, comprising a carrier substrate ( 200 ) for an electronic module ( 400 ) and one on the carrier substrate ( 200 ) ( 300 ), wherein the carrier substrate ( 200 ) and the lid ( 300 ) an electronics room ( 302 ), wherein the carrier substrate ( 200 ) in the electronics room ( 302 ) a mounting area ( 215 ) for the electronic module ( 400 ) and a mounting area ( 215 ) peripheral edge region ( 230 ), wherein the edge region ( 230 ) a the electronics room ( 302 ) facing first surface ( 204 ), characterized in that on the first surface ( 204 ) within the electronics room ( 302 ) at least one sharp edge ( 208 ), wherein the at least one sharp edge ( 208 ) through the section line of the first surface ( 204 ) with a substantially perpendicular thereto second surface ( 206 ), wherein the edge sharpness of the at least one sharp edge ( 208 ) is configured such that the at least one sharp edge ( 208 ) forms a liquid barrier, which prevents the penetration of a liquid film from the edge region (FIG. 230 ) in the direction of the electronic module ( 400 ) counteracts. Control unit according to claim 1, characterized in that the edge dimension of the at least one sharp edge ( 208 ) Is 50 microns or less, more preferably 20 microns or less. Control device according to one of claims 1 or 2, characterized in that the edge sharpness of the at least one sharp edge ( 208 ) is formed such that the surface energy of the first surface ( 204 ) at least one sharp edge ( 208 ) changed so abruptly that a liquid film, in particular an oil film, at the at least one sharp edge ( 208 ) shows entendency behavior. Control device according to one of claims 1 to 3, characterized in that in the first surface ( 204 ) a groove ( 220 ) is introduced, wherein the groove ( 220 ) one of the electronics module ( 400 ) facing away first groove wall ( 222 ) and an electronic module ( 400 ) facing second groove wall ( 224 ) having. Control device according to claim 4, characterized in that the groove ( 220 ) the electronic module ( 400 ) rotates. Control device according to one of claims 4 or 5, characterized in that the at least one sharp edge ( 208 ) through a section line between the first surface ( 204 ) and the second groove wall ( 224 ), wherein the second groove wall ( 224 ) as the second surface ( 206 ) substantially perpendicular to the first surface ( 204 ) runs. Control device according to one of claims 4 to 6, characterized in that the at least one sharp edge ( 208 ) through a section line between the first surface ( 204 ) and the first groove wall ( 222 ) is formed, wherein the first groove wall ( 222 ) as the second surface ( 206 ) substantially perpendicular to the first surface ( 204 ) runs. Control device according to one of claims 1 to 3, characterized in that in the carrier substrate ( 200 ) a recess ( 210 ) with a recess inner wall ( 212 ), wherein the mounting area ( 215 ) in the recess ( 210 ) is arranged and that the at least one sharp edge ( 208 ) through a section line between the first surface ( 204 ) and the recess inner wall ( 212 ), wherein the recess inner wall ( 212 ) as the second surface ( 206 ) substantially perpendicular to the first surface ( 204 ) runs. Control device according to one of claims 1 to 8, characterized in that the carrier substrate ( 200 ) is a printed circuit board, wherein at least one conductor track ( 260 ) is provided on an inner layer of the printed circuit board, which via a via ( 242 ) with a contact element ( 240 ) on the first surface ( 204 ) is electrically connected, wherein the contacting element ( 240 ) on the first surface ( 204 ) between the sharp edge ( 208 ) and the mounting area ( 215 ) for the electronic module ( 400 ) is arranged. Control unit according to claim 9, characterized in that the electronic module ( 400 ) by means of at least one electrical connection element ( 450 ) with the contact element ( 240 ) connected is. Control device according to one of claims 1 to 10, characterized in that between the lid ( 300 ) and the carrier substrate ( 200 ) a seal ( 310 ) is arranged.

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