Vehicle warning device, vehicle equipped with such a device, and method for recognizing a person in a vehicle

Abstract

Title: Vehicle warning device, vehicle equipped with such a device, and method for recognizing a person in a vehicle. Warning device (105) for a vehicle (100), having a control unit (110) comprising: - a first interface (115) for receiving an internal sensor signal (130) from an internal ultrasonic sensor unit (135) to generate ultrasound in the vehicle (100), - a processing unit (120) using this internal sensor signal (130) to provide a recognition signal (140) representing the recognition of a person (205) inside the vehicle (100), and - a second interface (125) for receiving several external sensor signals (145) from external ultrasonic sensor units (150) to generate ultrasound outside the vehicle (100). Figure 1

Description

Title of the invention: Warning device for a vehicle, vehicle equipped with such a device and method for recognizing a person in a vehicle FIELD OF THE INVENTION

[0001] The present invention relates to a warning device for a vehicle, as well as a vehicle equipped with such a device and a method for recognizing a person in a vehicle.

[0002] When children are left in a vehicle, the situation can be dangerous for children exposed to high temperatures. STATE OF THE ART

[0003] Document US 2017 / 0282822 A1 describes a system for preventing children from remaining or being forgotten in a vehicle.

[0004] PURPOSE OF THE INVENTION

[0005] The aim of the present invention is to develop a vehicle warning device as well as a vehicle equipped with such a device and a method for recognizing a person in a vehicle making it possible to prevent people, in particular children, from remaining trapped in a closed vehicle.

[0006] DISCLOSURE AND ADVANTAGES OF THE INVENTION

[0007] To this end, the invention relates to a warning device for a vehicle comprising a control apparatus characterized in that it comprises a first interface for receiving an internal sensor signal from an internal ultrasonic sensor unit for generating ultrasound in the vehicle, a processing installation using the internal sensor signal to provide a recognition signal representing the recognition of a person inside the vehicle and a second interface for receiving several external sensor signals from the external ultrasonic sensor units for generating ultrasound outside the vehicle.

[0008] In other words, the invention relates to a warning device enabling ultrasonic signals to be received from outside the vehicle to manage parking assistance and also an ultrasonic signal from inside the vehicle to recognize people left in the vehicle, in particular children. The warning device thus constitutes a safety system of simple and effective construction which can be advantageously applied to any type of vehicle.

[0009] The vehicle warning device comprises a control apparatus having a first interface, a processing facility and a second interface. The first interface receives an internal sensor signal from an internal ultrasonic sensor unit to generate ultrasound inside the vehicle. The processing facility uses the internal sensor signal to provide a recognition signal. This recognition signal represents a person detected inside the vehicle. The second interface receives a set of external sensor signals provided by external ultrasonic sensor units to generate ultrasound outside the vehicle.

[0010] Using the internal sensor signal, the processing installation provides a recognition signal that represents the fact that a person is detected, for example, in the back seat of the vehicle. Small children who are left in the back seat can thus be detected. For this, an ultrasonic sensor unit is, for example, installed in the vehicle and oriented towards an area of ​​the vehicle or a person, for example, a child who could be in the back seat. The internal sensor signal may represent the time measured by the internal ultrasonic sensor unit between the transmission and reception of the ultrasound generated by the internal ultrasonic sensor unit towards the monitored area. The duration of the internal sensor signal may also represent a determined distance.The processing facility uses this time or distance to recognize or detect whether the person is in the passenger compartment or not and provide the recognition signal if a person has been detected in the passenger compartment. The internal sensor signal can also represent a signal generated directly by the ultrasonic sensor unit as a detection signal if the person has been detected in the passenger compartment by the ultrasonic sensor unit. In this embodiment, the ultrasonic sensor unit uses the time or distance to recognize that a person is in the passenger compartment and provide this information as an internal sensor signal to the processing facility. In this embodiment, the processing facility provides the recognition signal corresponding to the receipt of the internal sensor signal, for example, immediately after the receipt of the internal sensor signal.

[0011] The external ultrasonic sensor units may be ultrasonic sensor units installed on the vehicle externally and which are, for example, used by a parking pilot to assist in parking maneuvers. The processing installation uses at least one of the signals from the external sensors to provide an environmental signal representing the environment (surrounding field) of the vehicle. The warning device thus comprises only one control device also used to control the parking pilot / parking pilot.

[0012] The processing installation uses a sequence of internal sensor signals to provide the recognition signal representing the recognition of the person remaining in a rear seat of the vehicle.

[0013] Advantageously, this also makes it possible to recognize, for example, a child sitting motionless in a child seat in the rear. For example, the first signals from internal sensors can be recorded when there is no child in the child seat. The system thus makes it possible to apply a marking to the interior space of the vehicle passenger compartment in the absence of a child and to issue a warning when a child is in the seat, even if the child remains motionless, for example, when asleep. The system can be programmed by the driver. This makes it possible to record different markings for different configurations of the area of ​​the rear seat(s) and independently of the current configuration of the range of the rear seat area when the journey began.Different configurations of the rear seating area may, for example, concern whether one or two child seats are provided and the nature of the use of the child seats. Thus, a child will not only be recognized if he or she moves, because precisely a sleeping child can be forgotten in the rear part of the vehicle.

[0014] According to one embodiment, the system knows where a child seat is located, i.e., where a static object has been placed. When another static object, for example, a box is placed on the back seat, this object does not generate a recognition signal. Additionally or alternatively, the recognition signal displays the movement of the person, for example, the child. Since the movement of a person reflects the emitted ultrasonic waves towards the person differently than a stationary object, this makes it possible to recognize the person by their movement.

[0015] For example, the processing system compares the current internal sensor signal and an internal sensor signal stored in memory. The recognition signal will be provided based on the result of this comparison. The internal sensor signal stored in memory can be associated with a specific configuration of the rear seat area. This makes it possible at the current time, for example, at the end of a journey or when the driver leaves the vehicle, to determine whether or not this specific configuration is present. If internal sensor signals are stored for the different configurations of the rear seat area, then the current internal sensor signal can be compared with all the sensor signals stored in memory. This increases the recognition accuracy. Instead of the sensor signals, the marking formed by the sensor signals can also be compared accordingly.

[0016] According to another advantageous characteristic, the warning device according to one embodiment comprises an activation installation for recording an activation signal representing a determined operating state of the vehicle and / or the absence of another person in the vehicle; this activation installation makes it possible to generate the activation signal as a function of the internal ultrasonic sensor unit to generate the ultrasonic signal. The determined operating state is the state of the vehicle from which it can be concluded that another person, for example, the driver of the vehicle, will soon get out of the vehicle. The determined operating state can also be, for example, a parked state of the vehicle after a journey, an idle state of the vehicle engine after its operation, i.e., a state in which the engine is switched off and, in addition or alternatively, a state in which the vehicle key is no longer in the vehicle ignition. The absence of the other person can be recognized, for example, with a camera or a pressure sensor fitted to the seats. Thus, the warning device will not be activated by the forgetfulness of the person when the person is about to arrive or has already arrived and allows the vehicle to operate without restriction.

[0017] The warning device may further comprise an on-board network control apparatus for using the recognition signal and transmitting a warning signal to the vehicle's warning system and / or a mobile device. This makes it possible to attract the attention of another person, for example, that of the driver to indicate to him that a person has been forgotten.

[0018] The on-board network control device is designed to output the warning signal for the vehicle display forming part of the warning system, this vehicle display being designed to generate an optical display corresponding to the warning signal. This warning signal will, for example, be output upon detection of a certain operating state, to remind the driver who is still in the vehicle that a person is in the rear seat. The vehicle display may be a combined instrument display.

[0019] Additionally or alternatively, the on-board network control device is designed to output the warning signal for the turn signal system and / or the horn system of the horn system; the turn signal system will start to flash depending on the warning signal and / or the horn system will generate a noise depending on the horn signal. Such a warning signal will, for example, be output when the presence of the other person is recognized, to alert the driver who is moving away or passers-by.

[0020] Additionally or alternatively, the control device of the on-board network transmits the warning signal to the mobile device to generate, in response to the warning signal, an optical and / or acoustic display on the device. Such a warning signal makes it possible to attract the attention of the person in the vehicle. The warning signal can be sent to the device of the driver or the owner of the vehicle, for example, to display a warning in an application.

[0021] The processing facility is designed to provide the recognition signal for a set period of time. This avoids putting too much strain on the vehicle's battery.

[0022] The warning device comprises an internal ultrasonic sensor unit. The warning device may also comprise several internal ultrasonic sensor units. The advantage is that the warning device comprises a child seat or a rear seat equipped with the internal ultrasonic sensor unit.

[0023] The invention also relates to a vehicle equipped with a warning device in accordance with the embodiment described above.

[0024] The method for recognizing a person in the vehicle comprises a receiving step and a providing step. In the receiving step, an internal sensor signal from ultrasonic sensors is received for generating ultrasound in the vehicle. In the providing step, a recognition signal is provided using the internal sensor signal which represents the detection of a person remaining in the vehicle.

[0025] In the receiving step, a set of external sensor signals from the external ultrasonic sensor unit may be further received to generate ultrasound outside the vehicle.

[0026] This method may be in the form of a program or a circuit or a mixed form comprising a program and an integrated circuit, for example, in the control apparatus of the warning device.

[0027] According to an advantageous characteristic, the warning device comprises an activation installation for recording an activation signal representing a determined operating state of the vehicle and / or the absence of another person in the vehicle,

[0028] the activation installation activating the internal ultrasonic sensor unit according to this activation signal to generate ultrasonic signals. PRESENTATION OF THE DRAWINGS

[0029] The present invention will be described below in more detail with the aid of a warning device and its detection method shown in the attached drawings in which:

[0030] [Fig-1] block diagram of a vehicle equipped with a warning device according to an exemplary embodiment,

[0031] [Fig.2] schematic top view of a vehicle equipped with a warning device according to an exemplary embodiment, and

[0032] [Fig.3] flowchart of a method for recognizing a person in a vehicle according to an exemplary embodiment.

[0033] In the description, the same references will be used for the different figures to designate the same elements or elements with the same functions.

[0034] DESCRIPTION OF EMBODIMENTS

[0035] [Fig.l] is a block diagram of a vehicle 100 equipped with a warning device 105 according to an exemplary embodiment of the invention. The warning device 105 equips, by way of example only, the vehicle 100.

[0036] The warning device 105 comprises a control apparatus 110 having a first interface 115, a processing facility 120 and a second interface 125. The first interface 115 receives an internal sensor signal 130 from an internal ultrasonic sensor unit 135 generating ultrasound in the vehicle 100. The processing facility 120 uses the internal sensor signal 130 to provide a recognition signal 140 representing the recognition or detection of a person inside the vehicle 10. The second interface 125 receives a set of sensor signals 145 emitted by external ultrasonic sensor units 150; these sensor units generate ultrasound outside the vehicle 100.

[0037] According to this exemplary embodiment, the internal ultrasonic sensor unit 135 is installed in the vehicle 100. The internal ultrasonic sensor unit 135 monitors the interior of the vehicle 100. The external ultrasonic sensor units 150 are installed on the vehicle 100 in its outer area, for example, on a bumper. According to this exemplary embodiment, there are twelve external ultrasonic sensor units 150; according to an alternative embodiment, there are a larger or smaller number of external ultrasonic sensor units 150. According to an alternative embodiment, in the interior of the vehicle, there is at most a single internal ultrasonic sensor unit 135. The internal ultrasonic sensor unit 135 according to this exemplary embodiment equips the rear seat of the vehicle 100; this internal ultrasonic sensor unit 135 according to this exemplary embodiment is part of the horn installation 105.According to one example, the warning system 105 also includes the rear seat.

[0038] The internal sensor signal 130 represents, in this exemplary embodiment, a measured duration of the internal ultrasonic sensor unit 135; this duration is between the transmission and the reception of the ultrasonic wave generated by the internal ultrasonic sensor unit 135. The processing installation 110 of this exemplary embodiment uses this duration or the distance calculated from this duration to detect whether a person is in the passenger compartment or not and to provide the recognition signal 140 if a person has been recognized in the passenger compartment. For this, the processing installation 110 according to this exemplary embodiment comprises a recognition algorithm module 155 containing an algorithm for recognizing the person using the internal sensor signal 130.

[0039] According to an alternative embodiment, the internal sensor signal 130 is the signal of the ultrasonic sensor unit 135 itself, which will generate a detection signal, when the person has been recognized in the passenger compartment by the ultrasonic sensor unit 135.

[0040] According to an alternative embodiment, the ultrasonic sensor unit 135 recognizes, for example, that the person is in the passenger compartment using the time or the distance; it provides this information in the form of the internal sensor signal 130 transmitted to the processing installation 120. According to this alternative embodiment, the processing installation 120 provides the recognition signal 140 corresponding to the reception of the internal sensor signal 130, for example, immediately after the reception of the internal sensor signal 130.

[0041] The external ultrasonic sensor units 150 according to this exemplary embodiment are used for a parking pilot, i.e., parking maneuver assistance. For this purpose, the processing installation 120 comprises, according to this exemplary embodiment, a parking pilot algorithm module 160 for controlling a parking pilot function with the external sensor signals 145. The processing installation 120 according to this exemplary embodiment uses at least one of the external sensor signals 125 to provide an ambient field signal representing the environment of the vehicle 100. The control device 110 can also be referred to as a "parking pilot control device".

[0042] According to an exemplary embodiment, the processing installation 120 uses a sequence of internal sensor signals 130 to provide the recognition signal 140 which represents the recognition of the person in the rear seat of the vehicle 100. For this purpose, the current sensor signals are compared, for example, with internal sensor signals stored in memory. The internal sensor signals are recorded, for example, at the time at which a configuration of the rear seat area is to be stored. Such recording is, for example, controlled by the driver's installation in the vehicle. These recorded internal sensor signals constitute a marking or can be cross-referenced to form a marking associated with the configuration of the rear seat area to be stored. In this way, different markings can be formed for different configurations of the rear seat area and recorded.At a given time, for example, at the end of a journey, according to an exemplary embodiment, the current marking is determined from the current internal sensor signals and compared with the markings stored in memory. Depending on the result of the comparison, according to this exemplary embodiment, the recognition signal 140 is emitted.

[0043] According to this exemplary embodiment, the warning device 105 further comprises an activation installation 165 and / or an on-board network control device 170. The on-board network control apparatus 170 may also be referred to as an "ECU body computer."

[0044] The activation device 165 is designed to record an activation signal 175 provided, for example, by the computer module or electronic control module BCM (Body Computer Module). The activation signal 175 indicates, for example, a certain operating state of the vehicle 100 and / or the absence of any other person in the vehicle 100. The activation device 165 according to an exemplary embodiment, activates the internal ultrasonic sensor unit 135 depending on the activation signal 175 to generate ultrasound. In this exemplary embodiment, the determined operating state is the state of the vehicle 100 which allows it to be concluded that the other person according to the exemplary embodiment is the driver of the vehicle 100 who will soon leave the vehicle 100.The operating state determined according to this exemplary embodiment corresponds to a parking state of the vehicle 100, to a stopped state of the engine of the vehicle 100 and / or to a state in which the key of the vehicle 100 is not engaged in the ignition of the vehicle 100.

[0045] According to an exemplary embodiment, the activation system 165 displays as activation signal 175 a camera signal from the vehicle camera, for example, from an infrared camera; this camera signal displays the absence of the other person. Additionally or alternatively, the activation system 165 records as activation signal 175 a signal from another system that recognizes the presence of the driver or a passenger in the vehicle 100. For example, the activation system 165 records as activation signal 175 a pressure signal at a seat. Advantageously, the corresponding pressure sensors are integrated in most vehicles and operate independently of the lighting.

[0046] The activation device 165 according to this embodiment transmits, depending on the activation signal 175, for example, immediately after recording the activation signal 175, a start signal 178 to the internal ultrasonic sensor unit 135; the start signal 178 thus activates the internal ultrasonic sensor unit 135.

[0047] The on-board network control device 170 uses the recognition signal 140 to output a warning signal 180 for the vehicle warning system 100 and / or a mobile device 185. The mobile device 185 can be located inside or outside the vehicle 100. The vehicle warning system 100 comprises, according to this exemplary embodiment, a vehicle display 187, a turn signal system 190 and / or a horn system 192. The on-board network control device 170 according to this exemplary embodiment outputs the warning signal 180 to the vehicle display 187 to thereby generate an optical display depending on the warning signal 180 and / or for the turn signal system 190 for generated by the warning signal 180, the flashing and / or the audible warning device 192 to generate an audible signal depending on the warning signal 180 and / or for the mobile device 185 to present an optical and / or acoustic display on the device 185 depending on the warning signal 180.

[0048] According to an exemplary embodiment, the processing installation 120 provides the recognition signal 140 for a certain duration, for example, for one or more hours.

[0049] According to an exemplary embodiment, the warning device 105 is implemented in the form of a rear seat warning system using the internal ultrasonic sensor unit 135. The main purpose of this warning device 105 is to monitor the rear seat to detect the presence of children in the vehicle 100. The main purpose of implementing such a function is to be able to protect children and to prevent them from remaining in the vehicle and possibly being exposed to high heat. The function provided by the warning device 105 will, if applicable, be mandatory as part of the future vehicle operating program, also called the “NCAP” program and, if applicable, be mandatory in the United States from the year 2021.

[0050] If a warning device 105, also called a "rear seat warning system", does not exist in a vehicle, it can be installed as a retrofit. The warning device 105 makes it possible to monitor one or more rear seats of the vehicle 100 in order to be able to determine whether a passenger is in the rear.

[0051] The warning device 105 uses the internal ultrasonic sensor unit 135 to recognize, according to this exemplary embodiment, different configurations in the region of the rear seat(s). If a configuration is recognized with the presence of a child, according to this exemplary embodiment, the driver will be warned by a message on the vehicle display 187, which may be a combined instrument display, that indicates and reminds him to check the rear seat(s) when leaving the vehicle 100. When the driver actually leaves the vehicle 100 and there is still a child in the rear seat(s), the vehicle 100 emits a warning sound, flashes, and / or sends a message to the driver's mobile device 185, for example, the driver's smartphone.

[0052] According to this solution, the warning device 105 reacts, for example, to situations in which an adult forgets a child in the back seat and also situations in which a child accidentally locks himself in the vehicle 100.

[0053] The warning device 105 comprises different modules and is based on ultrasonic sensor technology (abbreviated as USS technology). The internal ultrasonic sensor unit 135 used to monitor the rear seat(s) is located, according to this embodiment, at a suitable location inside the vehicle while facing rearward towards the rear seat(s). This additional ultrasonic sensor unit 135 is integrated into the parking pilot control unit 110 so that the logic and strategy include a rear seat warning function in the warning device 105. The warning device 105 according to this exemplary embodiment will be activated when the driver turns the vehicle key to its "engine off" position or removes the key from the lock / ignition. Each time the driver switches off the engine, the warning device 105 of this exemplary embodiment scans the interior of the vehicle 105. If an occupant is detected in the rear seat, one or more HMIs, i.e. one or more human-machine interface modules, warn the driver in different ways depending on whether the driver is still seated or has already left the vehicle 100. [Fig.l] provides an overview of the modules involved in the rear seat warning system and the interaction of the modules.

[0054] According to one embodiment, the rear seat warning function, i.e. the provision of the recognition signal 140 is limited in time to reduce the current consumption of the rear seat warning function after the ignition of the vehicle engine is switched off. The parking pilot control apparatus 110 according to this exemplary embodiment switches off automatically after a certain number of hours. The aim is to comply with the number of days of possible parking of the vehicle 100, standardized by the regulations.

[0055] The USS technique presented here, in comparison with cameras or radar installations, is an economical and effective solution since it is independent of sufficient lighting, to monitor the presence of children forgotten in a vehicle 100. The warning device 105 presented can be implemented in all vehicles 100 regardless of their type.

[0056] Several reasons support the use of the internal ultrasonic sensor unit 135. The ultrasonic sensor solution is very economical. For its implementation, since the ultrasonic sensor unit is very small, it is simply installed in the vehicle 100. For standardization, this increases the installation rate of ultrasonic sensors. In addition, the parking pilot function is part of all new vehicle types. From a detection point of view, the advantage is that the detection power of the ultrasonic sensors is not influenced by ambient light. This avoids the need for expensive infrared cameras. The ultrasonic waves can also detect hidden or covered locations. The power consumption of the ultrasonic sensors is very low. When the ignition is switched off, for example, when the driver has left the vehicle, the power consumption is advantageously very limited.From a health point of view, the sensors. Ultrasonic sensors do not emit electromagnetic radiation, unlike, for example, radars.

[0057] In contrast to known warning systems, the warning device 105 according to the invention uses ultrasonic sensors in the form of different ultrasonic sensor units 135, 150 with the same parking pilot control unit 110 which is already fitted to the vehicle 100. Thus, any additional control unit with the wiring harness becomes unnecessary. The warning device 105 according to this exemplary embodiment can use the CAM architecture of the vehicle, i.e., the bus system of the vehicle 100. Furthermore, by means of the warning device 105, it is possible to send an alarm to the driver's smartphone, for example, for display in a specific application such as an OEM application from an original equipment manufacturer, also called an OEM (Original Equipment Manufacturer) application.

[0058] [Fig. 2] is a schematic top view of a vehicle equipped with a warning device according to one embodiment. This may be the warning device of [Fig. 1] as well as the vehicle 100. To better see certain parts of the vehicle 100 outside the vehicle 100, these are shown on an enlarged scale.

[0059] The other person 200 according to the example, the driver of the vehicle 100 has got out of the vehicle while the person 205 is in a rear seat 210, namely a child in a child seat who still remains in the vehicle 100.

[0060] The internal ultrasonic sensor unit 135 according to this embodiment is activated. The warning device transmits the warning signal to one or more installations 187, 190, 192 of the warning installation of the vehicle 100 and the mobile device 185 of the other person 200.

[0061] [Fig. 3] shows a flowchart of a method 300 for recognizing a person in a vehicle corresponding to an exemplary embodiment. This may be a method 300 which is executed with warning devices described using the preceding figures.

[0062] The method 300 comprises a receiving step 305 and a providing step 310. In the receiving step 305, an internal sensor signal is received by an internal ultrasonic sensor unit that generates ultrasound in the vehicle. In the providing step 310, using the internal sensor signal, a recognition signal is provided that represents the recognition or detection of the person inside the vehicle.

[0063] In the receiving step 305, according to an exemplary embodiment, several external sensor signals emitted by external ultrasonic sensor units designed to generate ultrasound outside the vehicle are further received.

[0064] The method 300 according to this exemplary embodiment comprises an optional step 315 for activating and / or an optional step 320 for warning.

[0065] In activation step 315, an activation signal is recorded which represents a certain operating state of the vehicle and / or the absence of another person in the vehicle; the internal ultrasonic sensor unit is correspondingly activated in response to the activation signal to generate ultrasound. Activation step 315, according to this exemplary embodiment, is executed before reception step 305.

[0066] In the warning step 320, using the recognition signal, a warning signal is transmitted to the warning system of the vehicle and / or to a mobile device.

[0067] NOMENCLATURE OF MAIN ELEMENTS

[0068] 105 Warning device

[0069] 110 Control device

[0070] 115 First interface

[0071] 120 Treatment installation

[0072] 125 Second interface

[0073] 130 Internal Sensor Signal

[0074] 135 Internal ultrasonic sensor unit

[0075] 140 Recognition signal

[0076] 145 Sensor signal from external ultrasonic sensor unit

[0077] 150 External ultrasonic sensor unit

[0078] 160 Parking Pilot Algorithm Module

[0079] 165 Activation installation

[0080] 170 On-board network control device

[0081] 175 Activation signal

[0082] 178 Start signal

[0083] 187 Vehicle display

[0084] 190 Turn signal installation

[0085] 192 Installation of audible warning device

[0086] 300 Method

[0087] 305, 310, 320 Process steps

Claims

Claims

1. Warning device (105) for a vehicle (100), comprising a control apparatus (110) characterized in that it comprises: - a first interface (115) for receiving an internal sensor signal (130) from an internal ultrasonic sensor unit (135) for generating ultrasound in the vehicle (100), - a processing facility (120) using the internal sensor signal (130) to provide a recognition signal (140) representing the recognition of a person (205) inside the vehicle (100), - a second interface (125) for receiving a plurality of external sensor signals (145) from external ultrasonic sensor units (150) for generating ultrasound outside the vehicle (100) and - an activation facility (165) for recording an activation signal (175) representing a determined operating state of the vehicle (100) selected from the following group of parking states: parking the vehicle after a journey,idle state of the vehicle engine after its operation, state of the engine switched off, state in which the vehicle key is not in the vehicle ignition, and / or the absence of another person (200) in the vehicle (100), the activation installation (165) activating the internal ultrasonic sensor unit (135) according to this activation signal (175) to generate ultrasonic signals.,

2. Warning device (105) according to claim 1, characterized in that the processing installation (120) using at least one of the external sensor signals (145) provides a surrounding field signal representing the environment of the vehicle (100).

3. Warning device (105) according to one of the preceding claims, characterized in that the processing installation (120) uses a sequence of internal sensor signals (130) to provide the recognition signal (140) representing the recognition of the person (205) in the rear seat (210) of the vehicle (100).

4. Warning device (105) according to one of the preceding claims, characterized in that the treatment installation (120) compares the current internal sensor signal (130) and a stored internal sensor signal (130) and provides the recognition signal (140) using the result of this comparison.

5. Warning device (105) according to claim 1, characterized in that it comprises an on-board network control apparatus (170) for using the recognition signal (140) and transmitting a warning signal (180) for a vehicle warning installation (100) and / or a mobile device (185).

6. Warning device (105) according to claim 5, characterized in that the on-board network control device (170) transmits the warning signal (180) to a vehicle display (187) of the warning installation, the vehicle display generating an optical display corresponding to the warning signal (180).

7. Warning device (105) according to one of claims 5 to 6, characterized in that the on-board network control device (170) emits the warning signal (180) for the indicator system (190) and / or the horn system (192) of the warning system, the indicator system (190) flashing in dependence on the warning signal (180) and / or the horn system (192) generating a sound in dependence on the warning signal (180).

8. Warning device (105) according to one of claims 5 to 7, characterized in that the on-board network control device (170) emits the warning signal (180) for the mobile device (185) designed to generate an optical and / or acoustic display on the device (185) depending on the warning signal (180).

9. Warning device (105) according to one of the preceding claims, characterized in that the processing installation (120) provides the recognition signal (140) for a determined duration.

10. Warning device (105) according to claim 1, characterized in that it comprises an internal unit of ultrasonic sensors (135).

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