Controller device for motor vehicle, motor vehicle

Abstract

The invention relates to a control device for a motor vehicle, in particular for a motor vehicle that can be operated autonomously, the control device having a control device (3) for operating the motor vehicle and having a protection device (9) for protecting the control device (3) from electromagnetic interference fields or interference signals. The protection device (9) has a receiving device (10), a processing device (11) and a control device (8), the receiving device (10) being used to detect electromagnetic interference fields or interference signals, the processing device (11) being used to provide information about electromagnetic interference fields or interference signals detected by the receiving device (10), and the control device (8) evaluating the detected field and / or interference signal based on the detected information.

Description

Technical Field

[0001] The invention relates to a control device for a motor vehicle, in particular for an autonomously operable motor vehicle, comprising a control device for operating the motor vehicle and a protective device for protecting the control device from electromagnetic interference fields and / or interference signals.

[0002] The invention also relates to a motor vehicle having such a control device. Background Art

[0003] In the design and construction phase, current controllers have been guaranteed and checked in terms of their susceptibility to interference with respect to electromagnetic radiation or influence. Here, the requirements to be met are derived from legal requirements and additional customer requirements. Within these requirements, the controller must work or fall back (zurueckfallen) without error or at least in a safe operating mode. Here, these requirements are usually selected so that: these requirements mostly cover the electromagnetic interference fields that appear during operation. In special situations caused by increasing abandonment of metal in body manufacturing or due to intentional extreme impact experiments (such as, for example, the field super-high obtained by arranging the controller in a motor vehicle and / or arranging it at a cable harness), electromagnetic interference fields and interference signals that exceed these requirements may appear. Known protective devices are not enough to identify these electromagnetic interference fields and interference signals here. Summary of the invention

[0004] The controller device according to the present invention has the following advantages: the controller device is better protected from electromagnetic interference fields, in that the electromagnetic interference fields can be better identified and an improved safety response can be achieved. According to the present invention, the protection device has a receiving device for detecting electromagnetic interference fields, a processing device and a control device, the receiving device is used to detect electromagnetic interference fields, the processing device is connected to the receiving device and is used to provide information about the electromagnetic interference field detected by the receiving device, and the control device evaluates the detected interference field based on the detected information. By evaluating the interference field, it is possible to determine whether to take safety measures or not. Through a separate receiving device, the detection of electromagnetic interference fields is reliably guaranteed. In particular, the receiving device is arranged outside the housing of the controller, so that the optimal arrangement of the receiving device can be performed independently of the controller. Instead of the interference field, interference signals can also be detected and evaluated.

[0005] Preferably, the control device is designed to take safety measures if the interference field detected by the receiving device is evaluated by the control device as critical. Thus, for example, when a critical interference field is detected, a fallback plane of the control device is activated, in which the main basic functions of the control device are still ensured, and functions that may react sensitively to the detected electromagnetic interference field are deactivated or switched to safe operation. Likewise, in conjunction with further control devices, redundancy can be used.

[0006] Furthermore, it is preferably provided that the receiving device has at least one electrical line as a receiving antenna for electromagnetic interference fields, in particular as a receiving antenna for electromagnetic interference fields in the low-frequency range, which at least one electrical line extends at least in sections along a cable harness of the motor vehicle. As a result, the receiving device is outside the housing of the control unit and allows for improved detection of electromagnetic interference fields and / or signals. In particular, the arrangement outside the control unit allows for large-area detection and thus advantageous evaluation.

[0007] According to a preferred embodiment of the invention, the receiving device has at least one line on a printed circuit board of the controller, which surrounds a connection plug of the controller for the cable harness for magnetic coupling. As a result, possible common-mode currents on the cable harness are detected by magnetic coupling at the location where the controller is electrically connected to the cable harness, in particular in the low-frequency range.

[0008] Furthermore, it is preferably provided that the receiving device has at least one guide structure on the printed circuit board of the controller that acts as a receiving antenna and is designed in particular to detect electromagnetic fields in the higher frequency range. For this purpose, the conductor structure is designed in particular to be broadband. By combining a plurality of conductor structures that differ in position and orientation, it is also possible to detect interference fields from different spatial directions and to determine the spatial direction from which the interference field originates.

[0009] According to a preferred embodiment of the invention, the processing device has at least one analog-digital converter or converter. Simple evaluation of the information is ensured by digitizing the signal provided by the receiving device.

[0010] Particularly preferably, the analog-digital converter is designed to have a frequency-selective sensitivity with respect to high-frequency interference signals.

[0011] According to a preferred embodiment of the invention, the processing device alternatively or additionally has a high-frequency circuit for evaluating the signal provided by the receiving device. Although the high-frequency circuit is slightly more expensive than an analog-digital converter, it is suitable for generating a measurable analog voltage from the high frequency (for example, by means of a logarithmic amplifier).

[0012] Furthermore, it is preferably provided that the control device has at least one microcontroller. The microcontroller is used in particular to evaluate the information provided by the processing device, wherein the information is optionally preprocessed and filtered in order to evaluate the information or the detected interference field or interference signal. As already mentioned above, the control unit may take one or more safety measures depending on the evaluation.

[0013] The motor vehicle according to the invention is characterized by a control device according to the invention. As a result, the advantages already mentioned are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Further advantages and preferred features and feature combinations are particularly apparent from the foregoing description. In the following, the invention will be described in more detail with reference to the accompanying drawings.

[0015] Figure 1 A motor vehicle with an advantageous control device is shown in a simplified diagram. DETAILED DESCRIPTION

[0016] Figure 1 A motor vehicle 1 is shown in a simplified diagram, which has: a drive device 2 connected to the drive wheels of the motor vehicle; a controller 3 for operating the motor vehicle and in particular the drive device 2; and a cable harness 4, which connects the controller 3 to the drive device 2 and other electrical / electronic components of the motor vehicle 1 in an electrically and signal-technically manner, and the other electrical / electronic components such as, for example, sensors, cooling or heating devices, lighting devices, safety devices or the like.

[0017] The control unit 3 has a connection plug 5, via which the control unit 3 is electrically and signal-wise connected to the cable harness 4. The control unit 3 has a housing 6, in which at least one printed circuit board 7 is arranged, on which at least one control unit 8, in particular a control unit 8 in the form of a microcontroller, is arranged.

[0018] Furthermore, a protection device 9 is assigned to the control unit 3 , which serves to improve the operational safety of the control unit 3 in the event of electromagnetic interference.

[0019] The protection device 9 has a receiving device 10, a processing device 11 and a control device 8. According to the present embodiment, the receiving device 10 has an electrical line 12, which extends from the controller 3 along the cable bundle 4 and forms a receiving antenna 13 for electromagnetic interference fields in the low-frequency range. The line 12 is electrically coupled to the processing device 11 through the connecting plug 5. The processing device 11 has, in particular, an analog-to-digital converter 14, which has, in particular, a frequency-selective sensitivity to high-frequency interference signals, which can be used cost-effectively for the purpose of identifying electromagnetic fields. In particular, the corresponding pre-connection of the analog-to-digital converter 14 (for example, by biasing to a "high" or "low" level) leads to the targeted use of the asymmetrical input characteristic curve of the analog-to-digital converter, and thus leads to signal generation and recognition.

[0020] The control device 8, in particular the microcontroller mentioned above, is designed to evaluate the digital information provided by the processing device 11 and to evaluate the electromagnetic interference field or interference signal detected by the receiving antenna 13, and in particular to determine whether the electromagnetic interference field or interference signal is to be evaluated as critical. If this is the case, the control device triggers at least one safety measure, which, for example, causes the controller 3 to be switched into a safe operating mode, which is insensitive to electromagnetic interference. Optionally, the control device sends a warning signal to a user of the motor vehicle or another controller, and / or stores the result of the later evaluation in a memory of the controller 3. Alternatively to or in addition to the line 12, the receiving device 10 has an electrical line 15 embedded in the printed circuit board 7, which surrounds the connection plug 5 and thus detects possible common mode currents on the cable harness 4 via magnetic coupling, in particular common mode currents in the low-frequency range, and thus also detects electromagnetic fields acting on the cable harness 4. Alternatively or additionally, the receiving device 10 has at least one conductor structure 16 integrated on the printed circuit board 7, which serves as an integrated receiving antenna with a wideband for detecting interference in the higher frequency range. By combining a plurality of conductor structures 16 that differ in position and orientation, it is also ensured that interference fields from different spatial directions are detected.

[0021] As an alternative to the analog-digital converter 14 , it is also conceivable to design the processing device 11 with a high-frequency circuit which is suitable for generating a measurable analog voltage from the high frequency (for example by means of a logarithmic amplifier).

[0022] During conventional EMC release measurements, circuit components and filter thresholds of protective device 10 can be adjusted in such a way that they do not react according to the specification to electromagnetic influences and thus enable detection of disturbances outside the specified parameters / requirements.

Claims

1. A control device for a motor vehicle, comprising a control device (3) for operating the motor vehicle and a protective device (9) for protecting the control device (3) from electromagnetic interference fields or interference signals, characterized in that: The protection device (9) comprises a receiving device (10) for detecting electromagnetic interference fields or interference signals, a processing device (11) for providing information about the electromagnetic interference fields or interference signals detected by the receiving device (10), and a control device (8) for evaluating the detected fields and / or interference signals based on the detected information. The receiving device (10) has at least one electrical line on a printed circuit board (7) of the controller (3), the at least one electrical line surrounding a connection plug (5) of the controller (3) for a cable harness (4) of the motor vehicle (1) for magnetic coupling.

2. The controller device according to claim 1, characterized in that The motor vehicle is an autonomously operable motor vehicle.

3. The controller device according to claim 1, characterized in that The control device (8) is designed to initiate at least one safety measure if a detected interference field or interference signal is evaluated as critical.

4. The controller device according to any one of claims 1 to 3, characterized in that: The receiving device (10) has at least one electrical conductor (12) which extends at least in sections along a cable harness (4) of the motor vehicle (1) as a receiving antenna (13) for electromagnetic fields and / or interference signals.

5. The controller device according to any one of claims 1 to 3, characterized in that: The receiving device (10) has at least one conductor structure (16) on a printed circuit board (7) of the control unit (3) which acts as a receiving antenna.

6. The controller device according to any one of claims 1 to 3, characterized in that: The processing device (11) has at least one analog-digital converter (14).

7. The controller device according to claim 6, characterized in that The analog-to-digital converter (14) has frequency selective sensitivity.

8. The controller device according to any one of claims 1 to 3, characterized in that: The processing device (11) has a high-frequency circuit.

9. The controller device according to any one of claims 1 to 3, characterized in that: The control device (8) has at least one microcontroller.

10. A motor vehicle, characterized in that A controller device according to any one of claims 1 to 9 is provided.

11. The motor vehicle according to claim 10, characterized in that The motor vehicle is an autonomously operable motor vehicle.

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