Sensor cover, sensor system and motor vehicle

Abstract

The invention relates to a sensor cover (10) for a sensor system (12) for removing weather-induced dirt for the non-interference use of a sensor (14) of the sensor system (12), the sensor cover (10) having at least one sensor section (16) and the sensor cover (10) having at least one base body (18) for covering the sensor (14), the base body (18) being configured to cover the sensor (14). At least one electrode section (20) is arranged on the base body (18), and wherein the sensor cover (10) has at least one piezoelectric actuator (22) for generating sound waves in the sensor cover (10), the at least one piezoelectric actuator (22) being arranged on the at least one electrode section (20) of the base body (18).

Description

Technical Field

[0001] The invention relates to a sensor cover for a sensor system for removing weather-related dirt in order to use the sensors of the sensor system without interference, a sensor system and a motor vehicle. Background Art

[0002] As the degree of automation increases within the scope of automated driving, the requirements placed on the sensors of the driver assistance systems required for this also increase. In this case, the sensors are installed in particular in the front of the vehicle, but also in the rear. Here, the sensors have an exposed position. Possible installation locations for the sensors are behind the brand logo in the radiator grille, behind the apron in the bumper or in the area of ​​the ventilation grille. In particular, weather influences (such as rain, ice formation, dirt or salt deposits) affect the reliability of the functional range here, which usually also includes interventions in the steering, braking and acceleration characteristics of the vehicle (such as automatic speed control and distance control).

[0003] The above-mentioned boundary conditions thus influence the transmission properties of the radome for radiation of the electromagnetic spectrum, whereby in particular radar sensors can be limited in their functionality by virtue of the radar sensors supplying erroneous information or failing completely.

[0004] The attendant consequence may be an inability to recognize obstacles or the general surroundings. In the event of repeated failures of driver assistance systems, customer confidence in the value and safety of autonomously moving vehicles may also be affected.

[0005] Protective covers are already known from the prior art. The following possibilities for removing dirt or ice are known in protective covers:

[0006] - Structural design of the protective cover such that dirt or water is removed by wind flow or wind pressure. However, this method is highly dependent on the inflow of the protective cover or the corresponding weather.

[0007] - Treatment of the surface in order to make it more difficult for water, ice or dirt particles to adhere. This method makes it more difficult for dirt particles to adhere, but it cannot completely prevent or eliminate ice formation.

[0008] - Introduction of heat, in which a heating device is installed in the protective cover. However, the heating device may interact with the emitted or detected electromagnetic radiation of the sensor and is also very cost-intensive. In particular, technologies based on polarization of the electromagnetic field can only be used here to a limited extent due to the filtering effect of the wire mesh, since metal conductors such as copper are currently used for heating.

[0009] DE 10 2013 223 783 A1 discloses a radome cleaning device which makes the adhesion of dirt and the formation of ice more difficult by introducing ultrasonic frequencies into the cover by an external ultrasonic vibrator connected to the radome (i.e., the cover of the sensor). However, this cover in turn requires structural measures in order to install the ultrasonic vibrator in the range of the radar and protect the sensor from environmental influences. Summary of the invention

[0010] The object of the present invention is therefore to at least partially overcome at least one of the above-described disadvantages. In particular, the object of the present invention is to provide a simple and reliable de-icing and cleaning of the sensor cover.

[0011] The above objects are achieved by the sensor cover according to the invention, the sensor system according to the invention and the motor vehicle according to the invention. Features and details described in conjunction with the sensor cover according to the invention naturally also apply to features and details described in conjunction with the sensor system according to the invention and / or in conjunction with the motor vehicle according to the invention, and vice versa, so that the disclosures concerning the individual inventive aspects always refer or can refer to one another.

[0012] A first aspect of the present invention is a sensor cover for a sensor system for removing weather-induced contamination to enable undisturbed use of a sensor of the sensor system, wherein the sensor cover has at least one sensor segment, wherein the sensor cover has at least one substrate for covering the sensor, wherein at least one electrode segment is arranged on the substrate, and wherein the sensor cover has at least one piezoelectric actuator for generating sound waves in the sensor cover, wherein the at least one piezoelectric actuator is arranged at at least one electrode segment of the substrate.

[0013] Here, the sensor section is a region or a section of the sensor cover that covers or conceals the functional area of ​​the sensor. This region or section ensures that the sensor is protected from environmental influences and can be used without interference.

[0014] As already mentioned above, the sensor cover has a base body on which at least one piezoelectric actuator is arranged by means of at least one electrode segment. The piezoelectric actuator is thus operatively connected to the base body. The base body also has a sensor segment or a part of a sensor segment of the sensor cover. The electrode segment and the sensor segment can overlap or be arranged side by side or even have the same extension.

[0015] By means of the arrangement of the piezoelectric actuator, ultrasound can be transmitted into the base body, so that any buildup or contamination can be removed from the sensor cover by means of ultrasound.

[0016] Ultrasonic waves ensure that

[0017] a) by suitable mode selection of the frequency range of the ultrasound and the amplitude of the mechanical vibrations accompanying it, the adhesion of water droplets, dirt particles, salt deposits and the nucleation of ice crystals are influenced in this way, so that dirt does not adhere as well to weather-affected surfaces and ice does not form at all or only with difficulty,

[0018] and / or

[0019] b) Direct generation of heat in the coating or the piezoelectric sensor cover in order to support the melting of ice on the outer surface.

[0020] By means of a piezoelectric actuator, mechanical surface waves can be generated in the region of the boundary layer or in the matrix. In this case, the frequency is selected so that the deposits, ice, etc. either undergo a phase change (e.g. melting or evaporation) due to the introduced energy, or undergo a forced vibration due to the selection of a suitable frequency or amplitude (ideally in the frequency range of the deposit's own mode). By achieving a resonant situation, the cohesive forces in the attached layer and the adhesive forces in the boundary layer between the deposit and the outer surface of the sensor cover should be overcome. In this way, the contaminants or ice can be separated. In addition, there should be the possibility of selecting the frequency so that molecular friction processes occur in the piezoelectric actuator or the surface, which then generate heat. This heat can additionally support ablation.

[0021] Within the scope of the invention, it can be advantageous if each piezo actuator has a first electrode coating, a second electrode coating and a piezoelectric layer, wherein at least one section of the piezoelectric layer is arranged between the first electrode coating and the second electrode coating.

[0022] This constitutes a particularly simple and cost-effective construction of a piezoelectric actuator for a sensor cover. Due to the layer structure, the actual structure is not affected, or small layer thicknesses can be easily incorporated into the structure. At the same time, the layer structure can be quickly and easily applied to existing sensor covers and can thus be retrofitted. Due to the layer structure, no additional components need to be introduced into the region of the sensor. This solution thus constitutes a simplified solution.

[0023] By means of the electrode coating, ultrasonic frequencies for cleaning the sensor cover can be introduced into the piezoelectric layer in a simple manner. This eliminates dirt and ice formation on the outwardly directed surface of the sensor cover.

[0024] It is conceivable within the scope of the invention that at least one sensor section is sensor-transparent. The sensor transparency of the sensor section ensures that the measurement performed by the sensor can be carried out without interference. For example, it ensures that, at least in the region of at least one sensor section of the sensor cover, versatility for radar measurements or lidar measurements is provided.

[0025] It can be provided within the scope of the invention that at least one electrode segment is arranged on the base body in sections or over the entire surface.

[0026] In the case of at least one electrode segment extending in sections on the substrate, it is particularly advantageous if the at least one electrode segment extends along the sensor segment. In this case, the at least one sensor segment can extend partially or completely around the circumference of the sensor segment. In this case, the first electrode layer and the second electrode layer can have the same course as the at least one electrode segment. It is also conceivable that the areas of the first and second electrode layers and the electrode segments differ from one another at least to a small extent. However, the areas of the electrode segments and the areas of the first and second electrode layers can correspond to one another.

[0027] This facilitates the application of the first and second electrode layers to the base body, since a predefined area of ​​the at least one electrode section is provided.

[0028] In this case, the area of ​​the piezoelectric layer can correspond to the area of ​​at least one electrode section or the first and / or second electrode layer.

[0029] Here, it is also conceivable that the piezoelectric layer has an area that is different from the area of ​​the electrode segment. For example, the piezoelectric layer can have the area of ​​the substrate and only contact the first electrode layer and the second electrode layer in one segment. This allows a variable arrangement of at least one electrode segment or piezoelectric layer.

[0030] If the coating has too little sensor transparency, the electrode material can be omitted from the coating. In this case, instead of exciting the piezoelectric coating all over, vibration excitation occurs only in the edge region (ie, the electrode section). In this case, non-sensor-transparent materials can also be used as electrodes.

[0031] If the piezoelectric layer itself has too poor a sensor transparency, the piezoelectric layer can also omit the irradiated region. The sound waves are then further conducted into the irradiated sensor section via the structure-borne sound in that the sound waves are transmitted only via the connection between the coating and the base body.

[0032] Furthermore, it is conceivable that the piezoelectric layer of each piezoelectric actuator has a thickness of 5 nm to 500 nm, preferably of 10 nm to 250 nm, more preferably of 15 nm to 150 nm.

[0033] The thickness of the piezoelectric layer within the range described ensures the transmission of the ultrasonic frequency for removing dirt on the outer side of the sensor cover. In this case, each piezoelectric layer of the sensor cover has a thickness within this range. If a plurality of piezoelectric layers are arranged in the sensor cover or on the substrate, the individual piezoelectric layers can each have different thicknesses. It is also conceivable that a plurality of piezoelectric layers or a piezoelectric layer has a different thickness in the region of at least one electrode section than in the region of the sensor section. As a result, the thickness of the piezoelectric layer can vary over its cross section.

[0034] These thicknesses ensure the transmission of ultrasound to the substrate and are particularly suitable for arranging electrode segments or piezoelectric layers along the sensor segments. In this case, it is not necessary to ensure that the piezoelectric and electrode layers are sensor-transparent. Therefore, more cost-effective coating methods or materials can be used here.

[0035] It is also conceivable that the piezoelectric layer of each piezoelectric actuator has a thickness of 5 nm to 50 nm, preferably 10 nm to 45 nm, more preferably 15 nm to 40 nm in at least one sensor section.

[0036] If the piezoelectric layer is also arranged in the region of the sensor section, a thickness in the range of 5 nm to 50 nm ensures that the piezoelectric layer is sensor-transparent. This ensures the functioning of the sensor located behind.

[0037] It is also conceivable here that the thickness of the piezoelectric layer varies over the cross section of the piezoelectric layer. In this case, a sensor-transparent layer thickness of 5 nm to 50 nm can be provided in the region of the sensor section and a thickness greater than 50 nm can be provided in the region of the electrode section.

[0038] Within the scope of the invention, it is optionally possible for the piezoelectric layer to be polyvinyl fluoride.

[0039] The use of polyvinyl fluoride is particularly suitable for the piezoelectric layer, since excitation can be achieved simply via the first and second electrode layers and at the same time there is sensor transparency of the material.

[0040] Furthermore, when polyvinyl fluoride is used, the piezoelectric layer can be embodied in an optically transparent manner and at the same time permits high amplitudes at low voltages in order to be able to further conduct the ultrasound waves accordingly.

[0041] Furthermore, polyvinyl fluoride (PVDF) is stable against physical and chemical influences (such as the action of oils, acids or bases) and mechanical influences from the outside (such as abrasion or impacts), in particular against UV radiation from sunlight. In addition, polyvinyl fluoride has the physical requirements for radar suitability in the required frequency range, in particular with regard to attenuation and reflectivity.

[0042] Another advantage of PVDF as a piezoelectric medium is the additional superhydrophobic properties, whereby ice formation is delayed and ice adhesion is reduced. In addition, the coating can also be applied to the sensor cover facing away from the environment.

[0043] Furthermore, within the scope of the invention it can be provided that the first electrode coating of each piezo actuator and / or the second electrode coating of each piezo actuator comprises indium tin oxide or fluorinated tin oxide or aluminum-doped tin oxide or antimony tin oxide.

[0044] The tin-based materials mentioned allow simple excitation of the piezoelectric layer and can be easily sprayed onto the material of the base body or the piezoelectric layer. The sensor cover can therefore be produced simply and cost-effectively using the materials mentioned.

[0045] In connection with the invention, it is conceivable that at least two piezo actuators are arranged on each electrode section, wherein the at least two piezo actuators are independently controllable.

[0046] By using at least two ultrasound sources, ie piezoelectric actuators, the energy introduced in the form of ultrasound waves can be increased.

[0047] Providing at least two piezoelectric actuators increases the safety of cleaning the sensor cover. It is also conceivable to load the sensor cover with different frequencies so that different frequencies or waves can be introduced into the material of the substrate, thereby ensuring and possibly accelerating cleaning or de-icing.

[0048] It is conceivable to modulate the two piezoelectric actuators separately so that constructive or destructive interference between different fundamental waves can be generated by a targeted phase shift of the mechanical surface waves. In this way, amplitude resonances can be induced in a targeted manner, thereby also promoting the removal of buildup, ice, etc. In addition, a "direction" can be preset for buildup or dirt, for example downwards.

[0049] Furthermore, it is conceivable that a plurality of covering layers are provided, wherein each covering layer has at least one base body and at least one piezoelectric actuator.

[0050] The sensor cover can consist of various layers. In this case, a lamination of multiple cover layers can be performed. The cover layer comprises at least one substrate and at least one piezoelectric actuator. In this case, the cover layer is designed so that when it is applied to an already existing cover layer, it covers the piezoelectric actuator without forming an intermediate layer. As a result, the individual layers can accommodate the piezoelectric actuator of the respective underlying cover layer.

[0051] In this case, sufficient adhesion of the coatings to one another on the base body or the cover layer should be provided so as not to separate themselves due to the introduced ultrasound.

[0052] A second aspect of the invention is a sensor system according to the invention, in particular for a motor vehicle, having

[0053] at least one sensor,

[0054] at least one sensor cover according to the first aspect of the invention,

[0055] at least one voltage source, and

[0056] at least one acoustic transducer,

[0057] wherein at least one sensor cover is arranged such that at least one sensor section of the sensor cover covers at least one sensor and protects it from external environmental influences, and

[0058] Therein, at least one voltage source and at least one sound converter are electrically connected to at least one first electrode coating and at least one second electrode coating to generate ultrasonic waves.

[0059] The sensor system can thereby ensure that the sensor is protected from external influences by means of the sensor cover. The voltage source and the acoustic converter can load the various sensor covers with a frequency in order to ensure cleaning and de-icing of the weather-affected surface of the sensor cover. It is conceivable here that a control unit can be provided which can control the ultrasonic frequency at the respective sensor cover or the respective electrode section of the sensor cover.

[0060] The voltage source (eg, onboard electronics) should be able to modulate the voltage in terms of its pulse length (or frequency) and amplitude. In this way, the ultrasonic power and the frequency and amplitude of the resulting mechanical vibrations at the interface between the buildup and the sensor cover can be controlled in a targeted manner.

[0061] Within the scope of the invention it can be advantageous if the voltage source and the acoustic converter are designed to generate a frequency range in the ultrasonic range, wherein the generated frequency range differs from the frequency range of the covered sensor and / or the spaced-apart sensor.

[0062] This is particularly advantageous, since it can thereby be ensured that the ultrasonic range required for cleaning does not influence the measurements performed by the sensors located behind or the measurements of adjacent sensors. It is also particularly advantageous to select an ultrasonic range or frequency range that is not used by the installed sensors.

[0063] A third aspect of the present invention is a motor vehicle having at least one sensor system according to the second aspect of the present invention.

[0064] This is particularly advantageous since cleaning and de-icing of sensors installed in the motor vehicle can be ensured, thereby increasing the safety of the driver assistance system.

[0065] It is conceivable within the scope of the present invention that the sensor system is a radar system and / or a lidar system.

[0066] In this case, the sensor section is advantageously lidar-transparent or radar-transparent and ensures, in particular, distance measurement of a driver assistance system.

[0067] The advantages described in detail for the sensor cover according to the first aspect of the invention also apply to the sensor system according to the second aspect of the invention and to the motor vehicle according to the third aspect of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Further advantages, features and details of the invention are apparent from the following description, in which several exemplary embodiments of the invention are described in detail with reference to the accompanying drawings. The features mentioned in the claims and in the description may be essential to the invention individually or in any combination.

[0069] The invention is hereby illustrated in the following figures:

[0070] Figure 1 shows a schematic diagram of a first sensor cover having electrode sections;

[0071] Figure 2 A schematic diagram of a first sensor cover is shown in section AA;

[0072] Figure 3 shows a schematic diagram of a second sensor cover having two electrode sections;

[0073] Figure 4 A schematic diagram of a second sensor cover is shown in section BB;

[0074] Figure 5 shows a schematic diagram of a sensor system according to the present invention;

[0075] Figure 6 A schematic diagram of a motor vehicle according to the invention is shown. DETAILED DESCRIPTION

[0076] exist Figures 1 to 41 shows two different embodiments of a sensor cover 10 for a sensor system 12 for removing weather-related dirt in order to use the sensors 14 of the sensor system 12 without interference, respectively, in a top view and in a cross section. The sensor cover 10 has at least one sensor section 16 and at least one base body 18 for covering the sensor 14. The base body is sensor-transparent so as not to affect the functioning of the sensor 14 located behind.

[0077] In accordance with Figure 1 and Figure 2 In a first embodiment, at least one electrode section 20 surrounding the sensor section 16 is provided on the base body 18 . The piezoelectric actuator 22 provided for generating sound waves in the sensor cover 10 is arranged on the at least one surrounding electrode section 20 of the base body 18 .

[0078] For simple generation of sound waves, the piezoelectric actuator 22 has a first electrode coating 24 , a second electrode coating 26 and a piezoelectric layer 28 . In this case, at least one section 30 of the piezoelectric layer 28 is arranged between the first electrode coating 24 and the second electrode coating 26 .

[0079] As in Figure 1 As shown in FIG. 1 , the base areas of first electrode coating 24 and second electrode coating 26 correspond to the size and shape of at least one electrode section 20. In the first exemplary embodiment, first electrode coating 24 and second electrode coating 26 of piezo actuator 22 are made of indium tin oxide.

[0080] However, the piezoelectric layer 28 covers both the electrode segments 20 and the sensor segments 16. In this case, the piezoelectric layer 22 is made of polyvinyl fluoride and has a thickness D of 5 nm to 50 nm at least in at least one sensor segment 16. Sensor transparency is thereby ensured. This thickness D can also be 10 nm to 45 nm, and preferably 15 nm to 40 nm, in order to thus increase sensor transparency.

[0081] In accordance with Figure 3 and Figure 4 In a second embodiment, two electrode segments 20 are arranged on the base body 18 at opposite sides of the base body 18. The two electrode segments 20 thus have a segmented course on the base body 18. The electrode segments can be modulated independently, so that they can introduce different frequencies into the sensor cover 10, in order to predetermine the direction of dirt, for example.

[0082] Since the piezoelectric layer 22 is here only arranged in the electrode section 20 and between the first electrode layer 24 and the second electrode layer 26, it is not necessary to provide sensor transparency of the piezoelectric layer 28. Therefore, the piezoelectric layer can here have a greater thickness D. It has proven to be effective that in this embodiment the piezoelectric layer 28 has a thickness D of 5 nm to 500 nm, preferably 10 nm to 250 nm, more preferably 15 nm to 150 nm.

[0083] In the second embodiment, the piezoelectric layer 28 is also polyvinyl fluoride. However, the first electrode coating 24 of each piezoelectric actuator 22 and the second electrode coating 26 of each piezoelectric actuator 22 have fluorinated tin oxide. However, since two electrode sections 20 are provided, different materials can be used for the first electrode layer 24 and the second electrode layer 26 for each electrode section 20. Here, the material can be a combination of indium tin oxide and / or fluorinated tin oxide and / or aluminum-doped tin oxide and / or antimony tin oxide.

[0084] In one embodiment not shown, Figures 1 to 4 The embodiment of can be used as a covering layer in a layer structure composed of a plurality of covering layers.

[0085] exist Figure 5 1 shows a sensor system 12, in particular for a motor vehicle 34. The sensor system 12 has at least one sensor 14, at least one sensor cover 10 of a first embodiment, at least one voltage source 36 and at least one sound converter 38. It is also possible that the sensor cover 10 corresponds to Figure 3 and Figure 4 The second implementation method.

[0086] Here, at least one sensor cover 10 is arranged such that at least one sensor section 16 of the sensor cover 10 covers at least one sensor 14 and protects it from external environmental influences. In addition, at least one voltage source 36 and at least one sound converter 38 are electrically connected to at least one first electrode coating 24 and at least one second electrode coating 26 to generate ultrasound.

[0087] In order to prevent the installed sensors 14 from being influenced, the voltage source 36 and the acoustic converter 38 are designed to generate a frequency range in the ultrasonic range, wherein the generated frequency range differs from the frequency range of the covered sensors 14 and / or the spaced-apart sensors 14 .

[0088] exist Figure 6 The diagram shows a method having at least one Figure 5A motor vehicle 34 is provided with a sensor system 12. In this case, a radar system 40 and a lidar system 42 are provided in the motor vehicle as the sensor system 12, wherein the radar system 40 has a Figure 1 and Figure 2 The sensor coverage portion, and the laser radar system 42 is equipped with Figure 3 and Figure 4 The sensor cover.

[0089] Reference numerals list

[0090] 10 Sensor cover

[0091] 12 Sensor System

[0092] 14 Sensors

[0093] 16 sensor segments

[0094] 18 Matrix

[0095] 20 Electrode segments

[0096] 22 Piezoelectric Actuator

[0097] 24. First electrode coating

[0098] 26. Second electrode coating

[0099] 28 Piezoelectric layer

[0100] 30 Segments

[0101] 34 Motor Vehicles

[0102] 36 Voltage Source

[0103] 38 Sound Converter

[0104] 40 Radar System

[0105] 42 LiDAR System

[0106] D Thickness

Claims

1. A sensor cover (10) for a sensor system (12) for removing dirt caused by weather in order to use the sensors (14) of the sensor system (12) without interference, wherein: The sensor cover (10) has at least one sensor section (16), wherein the sensor cover (10) has at least one base body (18) for covering the sensor (14), wherein at least one electrode section (20) is arranged on the base body (18), and wherein the sensor cover (10) has at least one piezoelectric actuator (22) for generating sound waves in the sensor cover (10), wherein the at least one piezoelectric actuator (22) is arranged at at least one electrode section (20) of the base body (18).

2. The sensor cover (10) according to claim 1, It is characterized in that Each piezoelectric actuator (22) has a first electrode coating (24), a second electrode coating (26) and a piezoelectric layer (28), wherein at least one section (30) of the piezoelectric layer (28) is arranged between the first electrode coating (24) and the second electrode coating (26).

3. The sensor cover (10) according to claim 1 or 2, It is characterized in that The at least one sensor section (16) is sensor-transparent.

4. The sensor cover (10) according to any one of the preceding claims, It is characterized in that The at least one electrode segment (20) is arranged on the base body (18) in sections or over the entire surface.

5. The sensor cover (10) according to any one of the preceding claims, It is characterized in that The piezoelectric layer (28) of each piezoelectric actuator (22) has a thickness (D) of 5 nm to 500 nm, preferably 10 nm to 250 nm, more preferably 15 nm to 150 nm.

6. The sensor cover (10) according to any one of the preceding claims, characterized in that The piezoelectric layer (28) of each piezoelectric actuator (22) has a thickness (D) of 5 nm to 50 nm, preferably 10 nm to 45 nm, more preferably 15 nm to 40 nm in the at least one sensor section (16).

7. The sensor cover (10) according to any one of the preceding claims, It is characterized in that The piezoelectric layer (28) is polyvinyl fluoride.

8. The sensor cover (10) according to any one of the preceding claims, It is characterized in that The first electrode coating (24) of each piezoelectric actuator (22) and / or the second electrode coating (26) of each piezoelectric actuator (22) comprises indium tin oxide or fluorinated tin oxide or aluminum-doped tin oxide or antimony tin oxide.

9. The sensor cover (10) according to any one of the preceding claims, It is characterized in that At least two piezoelectric actuators (22) are arranged on each electrode section (20), wherein the at least two piezoelectric actuators (22) are independently controllable.

10. The sensor cover (10) according to any one of the preceding claims, It is characterized in that A plurality of cover layers are provided, wherein each cover layer has at least one base body (18) and at least one piezoelectric actuator (22).

11. A sensor system (12), in particular for a motor vehicle (34), comprising at least one sensor (14), at least one sensor cover (10) according to any one of the preceding claims, at least one voltage source (36), and at least one acoustic transducer (38), in, The at least one sensor cover (10) is arranged in such a way that at least one sensor section (16) of the sensor cover (10) covers the at least one sensor (14) and protects it from external environmental influences, and The at least one voltage source (36) and the at least one acoustic converter (38) are electrically connected to the at least one first electrode coating (24) and the at least one second electrode coating (26) to generate ultrasonic waves.

12. The sensor system (12) according to claim 11, It is characterized in that The voltage source (36) and the sound converter (38) are designed to generate a frequency range in the ultrasonic range, wherein the generated frequency range differs from the frequency range of the covered sensor (14) and / or the spaced-apart sensor (14).

13. A motor vehicle (34) having at least one sensor system (12) according to claim 11 or 12.

14. The motor vehicle (34) according to claim 13, It is characterized in that The sensor system (12) is a radar system (40) and / or a lidar system (42).

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