DE102018206812B4 - Method for suppressing an acoustic signal during an electrical charging process of a vehicle, and a system - Google Patents

Abstract

Method for suppressing an acoustic signal in an environment (1) of an electrically operated vehicle (2), in which the acoustic signal occurs during a charging process of the electrically operated vehicle (2) at an electrical charging station (3), characterized in that an environment (1) the electrically operated vehicle (2) and/or the charging station (3) is monitored with a sensor system (4) during the charging process and the presence of at least one person (5, 9, 14, 15) in the area is detected, wherein a position of the person (5, 9, 14, 15) is detected with the sensor system (4), and a suppression of the acoustic signal at the position of the person (5, 9, 14, 15) with a by at least one counter-sound source of the Vehicle (2) generated anti-sound field is carried out, wherein the anti-sound field with at least one loudspeaker (8, 13) of a loudspeaker system (7) of the anti-sound source is generated, and with several detected n people (5, 9, 14, 15) in the vicinity (1) of the electrically powered vehicle (2) and if there is only one loudspeaker (8, 13) of the loudspeaker system (7), the anti-sound field in the direction of the person (5, 9 , 14, 15) is generated, which has the shortest distance to the electrically operated vehicle (2).

Description

The invention relates to a method for suppressing an acoustic signal in the surroundings of an electrically operated vehicle, in which the acoustic signal occurs during a charging process of the electrically operated vehicle at an electrical charging station. Furthermore, the invention relates to a system and a vehicle.

the DE 10 2014 206 894 A1 relates to a device for compensating for a noise emission of a noise of a machine, the device comprising a microphone, a spectrum analyzer, a derivation device, an anti-noise device and a sound source. The microphone is designed to receive the noise in order to obtain a noise signal. The deriving means is configured to derive the spectrum using an operating parameter of the machine and an acoustic model to obtain a derived spectrum. The spectrum analyzer is configured to generate a spectrum of the noise using the noise signal. The device for determining is designed to determine an anti-noise signal using the spectrum and the derived spectrum. The adjustable sound source is designed to provide anti-sound waves using the anti-sound signal.

the US 8,862,299 B2 describes a perceptual output control system for a vehicle that can perform a number of different operations that are particularly useful for electric vehicles.

the DE 10 2014 201 228 A1 provides a method and system for active noise control in a vehicle. The system includes a position sensor for sensing an occupant's position. A microphone receives audible noise and generates an error signal corresponding to the audible noise. A first controller is configured to receive the error signal from the microphone and generate a modified error signal by modifying the error signal based on the occupant's position relative to the microphone. A second controller is in communication with the first controller and is configured to generate an anti-noise signal based at least in part on the modified error signal. The system also includes a speaker in communication with the second controller for receiving the anti-noise signal from the second controller and generating sound corresponding to the anti-noise signal to at least a portion of the audible to negate noise.

the DE 10 2009 037 170 A1 describes a method for emitting at least one acoustic signal to road users by means of a signaling device of a vehicle.

From the U.S. 2016/0173051 A1 a noise-reducing resonator which is highly effective in reducing noise is known. The noise-cancelling resonator includes a noise-cancelling resonator coil having an inductance component and a noise-cancelling resonator capacitor having a capacitance component, the noise-cancelling resonator having a resonance frequency calculated by adding an offset frequency. This is based on a degree of coupling between the main resonator coil and the noise-cancelling resonator coil. The degree of coupling is determined by a predetermined frequency of an electromagnetic field. The electromagnetic field is generated by a main resonator containing a noise source and the main resonator coil.

A disadvantage when charging a vehicle at an electric charging station is the generation of disturbing noises that are perceived in the surrounding area.

The object of the present invention is to at least reduce the perceptibility of the noises produced by an electric charging process of a vehicle.

This object is solved by a method and a system according to the independent patent claims. Useful further developments result from the dependent claims.

One aspect of the invention relates to a method for suppressing an acoustic signal in the vicinity of an electrically operated vehicle, in which the acoustic signal occurs during a charging process of the electrically operated vehicle at an electrical charging station. An environment of the electrically powered vehicle is monitored during the charging process with a sensor system and the presence of at least one person in the environment is detected, with a position of the person being detected with the sensor system, and a suppression of the acoustic signal at the position of the person with a an opposing sound field generated by an opposing sound source is carried out, the opposing sound field being generated with at least one loudspeaker of a loudspeaker system of the opposing sound source, and with several people being detected in the vicinity of the electrically operated vehicle and only one loudspeaker of the loudspeaker system being present Anti-sound field is generated in the direction of the person who has the shortest distance to the electrically powered vehicle.

For successful suppression of the acoustic signal, an anti-sound field should be generated which is able, for example, to counteract the sound level of the acoustic signal. For this purpose, an anti-noise source, which is located on the electrically operated vehicle, is required. In order to avoid installing separate components, the vehicle's loudspeaker system, for example, is used as an anti-noise source. For example, an external speaker system (e.g. an acoustic vehicle alerting system (AVAS)) can be used. This is optionally controlled in such a way that it is suitable for generating an anti-sound field.

The at least one loudspeaker is controlled in such a way that it generates an adapted counter-sound field in the direction of the person being detected. The loudspeaker system preferably has not just one but several loudspeakers. This makes it possible to generate a situation-adapted and needs-based anti-sound field in all areas of the environment of the electrically operated vehicle. Since with only one loudspeaker, for example, only a limited area of the environment can be generated with an anti-sound field, the loudspeaker system can be equipped with several loudspeakers in an optional version. For example, a speaker could be installed in the hood area. With this speaker, an anti-sound field can be generated in the direction of people who are in front of the vehicle. Another loudspeaker can be arranged at a rear of the vehicle and generate an anti-sound field to the rear. In addition to or instead of this, further loudspeakers can also be arranged on the vehicle for laterally radiating an opposing sound field. Provision can also be made for at least one loudspeaker to be pivotable, so that a dynamic change in the position of the opposing sound field is made possible, in particular a tracking of the opposing sound field of a moving person is made possible.

Since electrical charging stations can also be located in inhabited areas, it is possible that there are usually people in the vicinity of the charging station and the vehicle to be charged. People can all be exposed to the annoying acoustic signal during the charging process. Depending on the situation, several loudspeakers may be required to generate an anti-sound field for everyone. However, if only one loudspeaker is available, then the person to be covered with sound is determined according to a fixed procedure. Here, an anti-sound field is preferably generated in the direction of the person who is at the shortest distance from the electrically operated vehicle. In this case, all persons in the vicinity of the electrically operated vehicle are detected by means of the sensor system and the distance from all detected persons to the vehicle is then determined. The distances are then compared with one another and the opposing sound field is generated in the direction of the person who has the smallest distance. If the current person at the shortest distance is no longer in the vicinity of the vehicle, then it is preferably checked again which person is at the shortest distance from the vehicle. The distance from the person who is currently to be exposed to sound is also continuously checked, and if the person moves away from the vehicle, it is preferably checked again which of the people detected is at the shortest distance from the vehicle.

Suppression means a reduction in the perceptibility of the acoustic signal by the person, or alternatively complete compensation of the acoustic signal by the opposing sound field, so that in this case a person no longer perceives the acoustic signal.

The sensor system can be arranged on the vehicle and/or arranged on the charging station. The counter-noise source, such as a loudspeaker system, can be configured on the vehicle and/or on the charging station.

In order to be able to charge electrically powered vehicles, the number of electric charging stations is increasing. The electrical charging stations can be found, for example, in residential areas or in public places. As a result, the acoustic signal or noise that is generated during a charging process is perceived by people in the vicinity of the vehicle. So that this disturbing noise does not have an unpleasant effect on the person in the vicinity of the vehicle, it is preferably suppressed. The suppression typically reduces or compensates for the intensity or sound level of the acoustic signal by at least 80%, in particular by 90% or advantageously by 95%.

Preferably, at least one person is detected in the area surrounding the vehicle, in order in particular to then at least reduce the acoustic signal by at least one opposing sound field, depending on this, so that the acoustic signal is perceived at least reduced by the person. The detection of the person is preferably carried out with a sensor system (e.g. motion sensors, Distance sensors, position sensors, etc.) of the vehicle carried out, also separate sensor systems can be installed on the vehicle. This sensor system detects the person as soon as the person is at a predefined distance from the sensor system, and advantageously determines the position of the person and the distance from the person to the vehicle. This information is then processed in such a way that an anti-noise source in the vehicle generates an anti-noise field in the direction of the person detected. The anti-sound field ensures that the person detected in the vicinity of the vehicle is not adversely affected acoustically by noises that arise during the charging process. The source of interference can not only be the electrical charging station or the charging process, but can also be caused by an auxiliary unit (eg electric air conditioning compressor, fan, water pump) of the vehicle.

A further aspect of the invention provides that the anti-sound field suppresses and thus at least reduces the sound level generated by the acoustic signal at head height of the person. The person who is in the vicinity of the charging station of the electrically powered vehicle is exposed to a higher and disturbing noise level. Therefore, the sound level is at least reduced with the anti-sound field. The sound level is typically most disturbing at the height of the person's head. This is because that is where the human sense organs for perceiving sound are located. The anti-sound field is therefore calculated in such a way that the anti-sound field efficiently reduces the sound level at the head level of the at least one detected person. The size of the generated counter-sound field can preferably be selected here in such a way that it corresponds to the size of the disturbing sound level of the acoustic signal.

In particular, the intensity and/or the frequency of the counter-sound field is generated in such a way that the acoustic signal is at least partially compensated and thus at least weakened in terms of perceptibility. Thus, the sound level of the acoustic signal can be efficiently reduced.

A further aspect of the invention provides that when a number of persons are detected in the vicinity of the electrically operated vehicle, a number of separate counter-sound fields are generated, in particular are generated at least temporarily at the same time. This depends in particular on the positions of the people in relation to one another and/or in relation to the charging station and/or in relation to the vehicle. In order to suppress the acoustic signal for all persons detected in the vicinity of the vehicle, several opposing sound fields are generated. For example, an opposing sound field can be sufficient for two people who have been detected if the two people are standing directly opposite one another or are standing close together. If necessary, an anti-sound field would be sufficient to reduce the sound level. If, for example, a person is in front of the electrically operated vehicle and another person is in the area of the rear of the vehicle, it is not possible to reach both people with an opposing sound field. A separate anti-sound field can preferably be generated for the person at the rear of the vehicle and for the person in front of the vehicle, so that the sound level of the acoustic signal can be suppressed for both people. If, for example, three or more people are in different areas of the vehicle environment (e.g. in the area of the side door, the engine area and the rear of the vehicle), then a separate anti-sound field can preferably be generated for several, in particular all, people.

It is preferably provided that a dynamic movement of the at least one person in the vicinity of the electrically operated vehicle is detected by the sensor system, and that at least one counter-sound field is adjusted depending on the dynamic movement, in particular with regard to the orientation and/or range and/or the sound level and therefore the intensity. Since the person is typically in motion and is not always in the same position, the sensor system should be able to detect dynamic movements of the person. As a result, for example, the loudspeaker system can generate a suitable anti-sound field in the direction of the person's current position. As a result, efficient suppression of the sound level of the acoustic signal can be ensured even when a person is moving.

In an advantageous embodiment, it is provided that for the dynamic generation of the at least one opposing sound field, the orientation and/or range and/or intensity of the opposing sound field and/or the number of loudspeakers of the loudspeaker system that are activated to generate the opposing sound field and/or the duration How long at least one loudspeaker of the loudspeaker system is activated to generate the at least one anti-sound field is adjusted as a function of the dynamic movement. For example, a person moves in the vicinity of the electrically operated vehicle and covers a distance along the vehicle. The current position of the person changes constantly. So that the current position can be recorded, the sensors of the sensor system are preferably designed in this way forms in order to be able to capture the dynamic movement of the person.

Based on the detected position of the person, the loudspeaker system itself or a control unit of the overall system can decide which loudspeaker is best suited to generate an anti-sound field in the direction of the respective current position of the person. It may be the case that several loudspeakers are required for efficient suppression of the acoustic signal. For example, a loudspeaker attached to the engine area of the vehicle can only generate an anti-sound field in the area of the first half of the route, since the range of the loudspeaker is not sufficient. In the middle part of the track, an optional speaker should be installed on the side panel of the car. In order to efficiently cover the rear area of the track with one loudspeaker, another loudspeaker should be located at the rear of the vehicle.

For example, the active times of the loudspeakers should also be adjusted. A loudspeaker should preferably only be active as long as it generates an opposing sound field in the direction of the person being detected. As soon as the detected person has moved too far away from the loudspeaker, this loudspeaker should switch off and a more suitable other loudspeaker should be activated, for example, or an opposing sound field should not be generated if the person has left the environment in which an unwanted perception of the acoustic signal occurs .

The loudspeaker system can optionally adapt the intensity and/or the frequency of the generated anti-sound field to the dynamic movement of the person. The distance between the speaker and the person is taken into account. The closer the person is to the electrically operated vehicle, the stronger the disturbing perception of the acoustic signal. Here, for example, the intensity of the counter-sound field can preferably be adjusted in such a way that the sound level of the acoustic signal can be suppressed.

Provision is preferably made for the anti-sound field to be generated only when the detected person is at a distance that is less than a reference distance from the electrically operated vehicle and/or from the charging station. If, for example, the detected person is too far away from the electrically operated vehicle, in particular greater than the reference distance, then the perception of the acoustic signal is low or non-existent and therefore not disturbing. The sound level at head height of the detected person does not have to be suppressed with an opposing sound field. For example, a loudspeaker can be used to generate an anti-sound field for another person who has been detected.

As a result, the loudspeakers of the loudspeaker system can be used more efficiently and controlled in a targeted manner. As a result, no opposing sound fields are generated in the direction of people who are not disturbed by the acoustic signal at all.

Another aspect of the invention relates to a system with a vehicle and with a noise suppression system, which has a loudspeaker system with at least one loudspeaker and a sensor system with at least one sensor, the system being designed to carry out a method according to the above-mentioned aspect or an advantageous embodiment thereof is, in particular when an electrical charging process of the vehicle is being carried out at an electrical charging station. The noise suppression system is provided so that, for example, an acoustic signal that occurs during the charging process of an electrically operated vehicle at an electrical charging station can be suppressed. The noise suppression system optionally includes a loudspeaker system with, for example, at least one loudspeaker. At least one anti-sound field for suppressing the acoustic signal is generated with the aid of the loudspeaker. The sensor system can be designed on the vehicle and/or on the charging station. The loudspeaker system can be designed on the vehicle and/or on the charging station.

Another aspect of the invention relates to a vehicle and having a noise suppression system, which has a loudspeaker system with at least one loudspeaker and a sensor system with at least one sensor, wherein the system is designed to carry out a method according to the above-mentioned aspect or an advantageous embodiment thereof, in particular when an electric charging process of the vehicle is being carried out at an electric charging station.

A sensor can be a camera or an ultrasonic sensor or a radar sensor or an infrared sensor, for example. It can be provided that, in addition to or instead of this, the charging station has at least one such sensor for detecting a person.

Provision can also be made for the vehicle and/or the charging station to have at least one sensor for detecting wind strength and/or wind direction and/or rain and its noise in the vicinity of the charging station and/or the vehicle.

• 1 eine schematische Darstellung eines Ausführungsbeispiels eines erfindungsgemäßen Verfahrens im statischen Zustand;
• 2 eine schematische Darstellung eines Ausführungsbeispiels des erfindungsgemäßen Verfahrens im dynamischen Zustand.

Exemplary embodiments of the invention are described below. For this shows:

• 1 a schematic representation of an embodiment of a method according to the invention in the static state;
• 2 a schematic representation of an embodiment of the method according to the invention in the dynamic state.

The exemplary embodiments explained below are preferred embodiments of the invention. In the exemplary embodiments, the described components of the embodiments each represent individual features of the invention to be considered independently of one another, which also develop the invention independently of one another and are therefore also to be regarded as part of the invention individually or in a combination other than the one shown. Furthermore, the described embodiments can also be supplemented by further features of the invention that have already been described.

Elements with the same function are each provided with the same reference symbols in the figures.

Overall, the 1 , how an acoustic signal in the environment 1 of an electrically operated vehicle 2 is suppressed with a noise suppression system 19 of the vehicle 2. The noise suppression system 19 can be formed entirely on the vehicle 2 or entirely on an electrical charging station 3 , or partially on the vehicle 2 and partially on the charging station 3 . The noise suppression system 19 preferably has a sensor system 4 and a loudspeaker system 7 . In particular, the vehicle 2 and the noise suppression system 19 form a system, in particular also with the charging station 3. The acoustic signal is produced during a charging process of the electrically operated vehicle 2 at the electrical charging station 3 as a result of this charging process. The environment 1 of the electrically operated vehicle 2 is monitored by a sensor system 4 , which is arranged on the vehicle 2 here by way of example, to determine whether a person 5 is in the environment 1 of the vehicle 2 . The sensor system 4 has at least one first sensor 6 which detects the position of the person 5 . In particular, the sensor system 4 has a plurality of sensors 6 . In particular, these are arranged in such a way that the area around the vehicle 2 can preferably be recorded without any gaps.

If the person 5 is in the environment 1 in which the acoustic signal is still perceived by the person 5, at least one counter-sound field is generated to suppress the acoustic signal at the position of the person 5. An anti-sound field is thus generated at the position of the person 5 with a loudspeaker system 7, which is arranged entirely on the vehicle 2 here, for example. As a result, the acoustic signal at the position of person 5 is suppressed. The loudspeaker system 7 has at least one first loudspeaker 8 which generates the anti-sound field in the direction of the person 5 detected. In particular, the sound level of the acoustic signal at the position of a person 5 is reduced with the anti-sound field. This means in particular that the opposing sound field is generated in such a way that the superimposition of the sound waves of the acoustic signal and the opposing sound field and thus an acoustic opposing signal results in at least partial acoustic cancellation of the acoustic signal at the position of the person 5 . As a result, the acoustic signal is perceived by the person 5 at least only to a reduced extent at the position of the person.

An advantageous second sensor 12 of the sensor system 4 can be used to efficiently detect people in the entire area of the environment 1 . If, for example, a second person 9 is at least temporarily in the area 1 of the vehicle 2 at the same time as the first person 5 and only the first sensor 6 is functional or only one sensor is installed, then the anti-sound field is preferably generated in the direction of the person who is using the has a shorter distance to the vehicle 2. For example, if a first distance 10 between the vehicle 2 and the person 5 is smaller than a second distance 11 between the vehicle 2 and the second person 9, then the anti-sound field is generated in the direction of the first person 5.

If, for example, the loudspeaker system 4 is equipped with at least one second loudspeaker 13, then not only can an anti-sound field be generated in the direction of the first person 5, but at the same time, at least temporarily, a separate additional anti-sound field can be generated in the direction of the second person 9.

It is also conceivable that, in addition to or instead of the first person 5 and/or the second person 9, at least a third person 14 and a fourth person 15 are in the area 1 of the electrically operated vehicle 2 and that these are at least two other people 14, 15 are positioned close together, for example because they are talking. As a result, the perception of the acoustic signal and the sound level caused is 14 for the third person and for the fourth person son 15 almost the same. In this example, a common counter-sound field can then be generated for these two people 14, 15. Thus, an optional common anti-sound field is sufficient. In the exemplary embodiment, an anti-noise level is generated in the direction of the third person 14 and the fourth person 15 by the first sensor 6 of the sensor system 4 . As a result, the sound level of the acoustic signal at the position of the two people 14, 15 is suppressed.

An anti-sound field or multiple anti-sound fields are preferably generated in such a way that the acoustic signal is suppressed at head height of a person 5, 9, 14, 15.

In 2 shows an example of how an anti-sound field is generated in the direction of a moving person 5 and how the anti-sound field is adapted to a dynamic movement of the person 5. A person 5 is in the vicinity 1 of an electrically operated vehicle 2 which is carrying out a charging process at an electrical charging station 3 . The person 5 is detected at a first location 16 in the area 1 of the electrically operated vehicle 2 with the first sensor 6 of the sensor system 4 . Using the first loudspeaker 8 of the loudspeaker system 7 of the electrically operated vehicle 2, an opposing sound field is generated in the direction of the first location 16, where the person 5 is currently located. The intensity of the opposing sound field is determined taking into account the distance between person 5 and vehicle 2 and the strength of the disturbing sound level. Thus, the sound level of the acoustic signal at the position of the person 5 can be suppressed efficiently.

If the person 5 moves away from the previous first location 16 and covers a distance 18 in the direction of a second location 17, then in an advantageous embodiment the at least one generated counter-sound field can be adapted to the dynamic change in position of the person 5 relative to the vehicle 2, or dynamically in particular be changed positionally and/or with respect to the sound level of the acoustic signal. The detection range of the first sensor 6 of the sensor system 4 includes, for example, the range of the first half of the route 20 from the first location 16 to the second location 17. As soon as the person 5, for example, covers more than half the distance between the first location 16 and the second location 17 has covered, the second half of the route 21 is preferably recorded by the second sensor 12 of the sensor system 4 . In the first half of the section 20, the anti-sound field for suppressing the acoustic signal is generated, for example, in particular only by the first loudspeaker 8. If the person 5 moves in the second half of the distance 21, then the anti-sound field is generated, for example, in particular only by the second loudspeaker 13 of the loudspeaker system. There can also be an intermediate area on the way of the person 5 between the locations 16 and 17, in which both an opposing sound field is generated by the loudspeaker 8 and at least temporarily by the further loudspeaker 13 at the same time.

For example, the position of a moving person 5 in the intermediate area can be detected by a sensor system 4 consisting of, for example, the first sensor 6 and the second sensor 12 . Likewise, for example, the entire route between the first location 16 and the second location 17 can be recorded. As a result, the position of a person 5 can be detected over a section or over the entire route between the first location 16 and the second location 17 using only one sensor in the sensor system 4 or by using a plurality of sensors, possibly all available sensors in the sensor system 4. For example, an anti-sound field to minimize an acoustic interference field at the current position of a moving person 5 on sections of the route between the first location 16 and the second location 17 can be generated by at least one or more, possibly also all, loudspeakers of the loudspeaker system 7.

At least one loudspeaker can also be moved, in particular pivoted, in at least one spatial direction.

It can also be provided that only the loudspeaker is active in whose emission area the person 5 is located. If the person 5 covers the route 18, for example, only the first loudspeaker 8 is active as long as the person 5 is in the first half of the route 20. During this time, the second speaker 13 is inactive. As soon as the person 5 is in the second half of the distance 21, the second loudspeaker 13 becomes active and the first loudspeaker 8 becomes inactive in one exemplary embodiment.

If the sensors detect a person moving very quickly, it can be provided in a further embodiment that the electronic noise suppression system 19 in particular determines how long and at what time each individual loudspeaker must generate a suitable anti-sound field.

In general and independently of the exemplary embodiments explained, but also in these, it can also be provided that sensors on the vehicle 2 determine the ambient conditions of driving zeugs 2 are recorded as environmental information, such as a wind direction and / or wind speed or rain, etc. This information can be taken into account in order to generate a needs-based anti-sound field. In particular, this information can be linked in connection with a position of a person 5, 9, 14, 15 in relation to vehicle 2, so that, for example, depending on a position, which can be a distance and/or an orientation, of person 5, 9, 14 , 15 and environmental information is determined or estimated how the acoustic signal acts acoustically at the position of the person 5, 9, 14, 15 and thus how it is perceived there. In addition or instead of this, the acoustic signal can be detected by at least one sensor on the vehicle 2 in order to be able to deduce its sound level at the position of a person 5, 9, 14, 15 depending on the sound level of the acoustic signal on the vehicle 2, so that depending on this, in turn, a more needs-based generation of the anti-sound field is made possible. Likewise, other acoustic noises in the environment can also be detected and taken into account when determining the opposing sound field.

It is not only advantageous in this context if, when a person is detected in the surroundings 1, it is checked whether this person is at a distance that is less than a reference distance from the vehicle 2 and in particular from the source of the acoustic signal. This reference distance is preferably the distance up to which the acoustic signal is perceived by a person 5, 9, 14, 15, particularly in a disturbing manner. In particular, the anti-sound field is only generated when the person 5, 9, 14, 15 is within the zone delimited by the reference distance.

In particular, the reference distance can change due to influencing parameters, such as the environmental information and/or the position of a person 5 , 9 , 14 , 15 in relation to the vehicle 2 and the charging station 3 , which can also change dynamically. This can also be taken into account in order to then individually generate and/or change an anti-sound field or multiple anti-sound fields in a dynamically adapted manner.

Claims (7)

Method for suppressing an acoustic signal in an environment (1) of an electrically operated vehicle (2), in which the acoustic signal occurs during a charging process of the electrically operated vehicle (2) at an electrical charging station (3), characterized in that an environment (1) the electrically operated vehicle (2) and/or the charging station (3) is monitored with a sensor system (4) during the charging process and the presence of at least one person (5, 9, 14, 15) in the area is detected, wherein a position of the person (5, 9, 14, 15) is detected with the sensor system (4), and a suppression of the acoustic signal at the position of the person (5, 9, 14, 15) with a by at least one counter-sound source of the Vehicle (2) generated anti-sound field is carried out, wherein the anti-sound field with at least one loudspeaker (8, 13) of a loudspeaker system (7) of the anti-sound source is generated, and where several detected en people (5, 9, 14, 15) in the vicinity (1) of the electrically operated vehicle (2) and if there is only one loudspeaker (8, 13) of the loudspeaker system (7), the anti-sound field in the direction of the person (5, 9 , 14, 15) is generated, which has the shortest distance to the electrically operated vehicle (2). procedure after claim 1 , characterized in that the anti-sound field at least reduces the sound level generated by the acoustic signal at head height of the person (5, 9, 14, 15). Method according to one of the preceding claims, characterized in that when several people (5, 9, 14, 15) are detected in the area (1) surrounding the electrically operated vehicle (2), several separate counter-sound fields are generated. Method according to one of the preceding claims, characterized in that a dynamic movement of the at least one person (5, 9, 14, 15) in the environment (1) of the electrically operated vehicle (2) is detected by the sensor system (4), and that at least one anti-sound field is adjusted depending on the dynamic movement. procedure after claim 4 , characterized in that for the dynamic generation of the at least one counter-sound field, the orientation and/or range and/or intensity of the counter-sound field and/or the number of loudspeakers (8, 13) of the loudspeaker system (7), which are activated to generate the counter-sound field, and/or the length of time for which at least one loudspeaker (8, 13) of the loudspeaker system (7) is activated to generate the at least one counter-sound field is adjusted as a function of the dynamic movement. Method according to one of the preceding claims, characterized in that the anti-sound field is only generated when the detected person (5, 9, 14, 15) is less than or equal to a defined reference distance from the electrically operated vehicle (2). System with a vehicle (2) and with a noise suppression system (19), which has a loudspeaker system (7) with at least one loudspeaker (8, 13) and a sensor system (4) with at least one sensor (6, 12), the system is designed to carry out a method according to one of the preceding claims, in particular when an electrical charging process of the vehicle (2) is carried out at an electrical charging station (3).

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