Control device for a pyrotechnic safety device

Abstract

Control device (100) for a pyrotechnic safety device (102) for a high-voltage power supply (104) of a motor vehicle (106), in particular a hybrid or electric vehicle, comprising the following devices: - a sensor device (108) for generating a sensor signal (118) relating to an operating state (116) of the high-voltage power supply (104) and / or the motor vehicle (106), - a measuring device (110) for detecting the sensor signal (118) and for providing a measuring signal (120) representing the sensor signal (118); - a control device (112) which is designed to control the pyrotechnic safety device (102) using the measurement signal (120) by means of a control signal (122); - an energy storage device (114) for supplying the control device (112) and the measuring device (110) with electrical energy (124) and for providing a triggering energy (126) for the pyrotechnic safety device (102); and - a supply interface (128) for supplying the control device (112) and the measuring device (110) with electrical energy (124), wherein the supply interface (128) is connectable to the high-voltage power supply (104), characterized in that the control device (112) is designed to monitor the energy store (114) and to control the charging process of the energy store (114) via the electrical energy (124) applied to the supply interface (128).

Description

Technical field

[0001] The present invention relates to a control device for a pyrotechnic safety device for a high-voltage power supply of a motor vehicle. State of the art

[0002] Electric and hybrid vehicles in particular have battery systems with high system voltages and a high storage density in order to be able to provide the required drive power. In the event of accidents or other malfunctions, these systems and the on-board electrical systems that distribute the corresponding electrical energy can pose a danger to both vehicle occupants and firefighting and rescue teams, as they can be exposed to the high direct voltages. For this reason, fuses, relays, or contactors are used in such vehicles to safely disconnect the battery systems from the on-board electrical system in the event of an accident or other technical problem. Fuses and pyrotechnic switches are used for this purpose. Fuses disconnect the correspondingly protected electrical conductor after a certain time if short-circuit currents exceed a certain limit.The pyrotechnic switches mentioned can separate the electrical conductor protected in this way from a central control unit, for example when coupled with the deployment of the airbags.

[0003] For example, the generic document DE 10 2013 209 835 A1 describes a separating device (pyrotechnic switch) for irreversibly interrupting the conductive connection between the battery modules in the event of an accident. The separating devices can be designed as pyrotechnic separating devices. The separating elements can be triggered by a dedicated control unit, via the battery control unit, or via the airbag control unit. The control unit can be powered by the vehicle battery, and additionally or alternatively, energy storage can be provided in the control unit, for example, through suitable capacitors.

[0004] DE 10 2011 014 343 A1 discloses a safety device for a power supply of a motor vehicle, comprising a conductor element having a predetermined breaking point and a pyrotechnic safety element with a propellant charge that, when triggered, severs the predetermined breaking point of the conductor element. A control device configured to receive and evaluate input signals uses the input signals to determine whether the propellant charge is triggered. The control device can be provided in the same housing as the pyrotechnic safety element. The input signals are sent to the control device from an external device, for example, from sensors for detecting an accident. The disadvantage of this solution is that if the low-voltage power supply fails, the safety device no longer functions.

[0005] The solutions presented have the disadvantage that they cannot operate completely autonomously if, for example, the on-board network no longer supplies power but the battery has not yet been disconnected across all poles.

[0006] The document WO 2010 / 000 525 A1 relates to a device for controlling all airbags for a vehicle, a control unit for generating a control signal for all airbags for a vehicle, and a system comprising the device. Description of the invention

[0007] The task of the control device is to at least partially eliminate disadvantages of the known state of the art and, in particular, to be able to operate independently of auxiliary or supply systems.

[0008] The above-mentioned object is achieved by the subject matter of the independent claim. Advantageous embodiments of the invention emerge from the dependent claims, the following description, and the figures.

[0009] According to one aspect of the present invention, a control device for a pyrotechnic safety device for a high-voltage power supply of a motor vehicle is presented. The vehicle can be, in particular, a hybrid, plug-in, fuel cell, or electric vehicle. The control device comprises a sensor device, a measuring device, a control device, and a supply interface.

[0010] A pyrotechnic safety device can be understood as a so-called pyro-fuse or pyro-protection device. Such a pyrotechnic safety device comprises a propellant charge that, with the aid of a separating agent or a predetermined breaking point, is designed to separate the busbar upon activation. As explained above, this is necessary, for example, for currents above 2000 amperes.

[0011] The sensor device is designed to generate a sensor signal representing an operating state of the power supply and, simultaneously or alternatively, an operating state of the motor vehicle. Thus, the sensor device can be understood as a sensor that converts a physical phenomenon into a sensor signal. The sensor signal can be an analog or digital sensor signal. The measuring device is designed to detect the sensor signal, i.e., to convert it into a signal that can be further digitally processed, and to provide it as a measurement signal. Thus, the measuring device can be designed to read and process analog and, simultaneously or alternatively, digital signals.

[0012] The control device is configured to provide a control signal that activates, i.e., in particular, triggers, the pyrotechnic safety device. For this purpose, the measurement signal is processed to generate the control signal.

[0013] The supply interface is connectable to an external energy storage device. In one embodiment, this is an external low-voltage energy storage device. In an alternative embodiment, the supply interface is connectable or connected to the high-voltage power supply. The high-voltage power supply can be understood to mean a high-voltage energy storage device and a distribution network for distributing the high voltage. In preferred embodiments, at least part of the distribution network is designed as a busbar. The pyrotechnic safety device can be arranged on the busbar. The high-voltage power supply generally comprises a busbar. The supply interface is designed to supply the measuring device and the control device.

[0014] The control device presented here creates a pyrotechnic safety device with the highest standards of reliability and independence from external systems, especially for use in electric and hybrid vehicles

[0015] In a first, preferred embodiment, the supply interface comprises a DC / DC converter. The DC / DC converter converts the voltage present in the high-voltage power supply into a low voltage compatible with the control device. The DC / DC converter provides a voltage supply for the control device at least at a voltage greater than 300 V in the high-voltage power supply range, better in a range greater than 60 V, and particularly advantageously in a range from 50 V. The DC / DC converter operates up to a voltage of 1000 V in the high-voltage power supply range. The DC voltage within the control device is in the range of less than 12 V, preferably in the range of less than 7 V, in particular less than 5.5 V. The lower limit is preferably between 2.7 V and 3.3 V.

[0016] Since the control device is used to protect the high-voltage power supply, it is advantageous that the control device covers the entire high-voltage range. If the live parts have a voltage below 60 V, the danger to people is significantly lower, and the safety regulations for the so-called low-voltage range apply. If the control device realizes its power supply directly via the high-voltage power supply, functional reliability is guaranteed in the system-critical area. This also advantageously provides protection during extremely long downtimes of the vehicle, for example, several months during which a low-voltage power supply is no longer functioning.

[0017] When using a DC / DC converter, it is advantageous to place it in the B+ path of the high-voltage power supply, i.e., it is connected to it or connectable to it. Thus, as already explained above, sufficient energy is available at the crucial times and the system is protected at the optimal location. This advantageously includes arranging the pyrotechnic safety device in the same path.

[0018] Furthermore, the control device can have a housing. The sensor device, the measuring device, and the control device are then arranged in a common housing. The housing has at least the supply interface and a control interface as external connections. The control signal for controlling the pyrotechnic safety device is applied to the control interface. The control interface can thus be connected to the pyrotechnic safety device. The supply interface can be connected to the external energy storage device. This allows the control device to be easily integrated into a system. The components are protected from environmental influences. EMC protection is also easily implemented.

[0019] According to an advantageous embodiment, the sensor device is integrated into the measuring device. Thus, the sensor device and the measuring device can be arranged on a common circuit board. This allows for a particularly integrated solution with short signal paths and cost-effective production.

[0020] In a preferred embodiment, the control device is also arranged on the circuit board. Thus, the sensor device, the measuring device, and the control device can be implemented, for example, in SMD design. Parts of the control device can be integrated into an ASIC. This allows for the creation of a compact control device.

[0021] Furthermore, the sensor device can be designed as a gyro sensor, a 2D acceleration sensor, a 3D acceleration sensor, an airbag sensor, a temperature sensor, a voltage sensor, or a current sensor. Using a gyro sensor or gyrometer or an acceleration sensor, many driving conditions, in particular a (partial) crash, can be sensed. This allows a very rapid response to an accident. If the sensor is designed as a current sensor, overcurrents can be detected very quickly and the pyrotechnic safety device can be triggered immediately. A current measurement can be compared with a current threshold value, so that, for example, triggering is guaranteed from 2000 A. A voltage sensor can be used to easily check for undervoltage, for example to protect the high-voltage energy storage device from undervoltages.A combination of current and voltage measurements is also useful, for example, using a combined current-voltage sensor. In this case, a DC / DC converter and comparators are integrated into the sensor. Temperature measurements – to protect against overheating – can be taken directly using a temperature sensor or derived from two current measurements. The first current measurement can be taken within the control device and the second in the area of the high-voltage energy storage device or, alternatively, downstream of the pyrotechnic safety device, in particular downstream of a consumer. A temperature can be determined from the two current measurements. Furthermore, leakage currents can be detected in this way, allowing the pyrotechnic safety device to be activated at an early stage. The rapid response capability can increase safety.

[0022] In one embodiment, the measuring device has a sensor interface. The sensor interface is designed to read in a further sensor signal from a sensor arranged externally to the control device. The further sensor signal can be understood not only as a signal from a sensor, but also as a signal derived or processed from it. For example, it can be a signal from a control unit, for example an airbag control unit or a higher-level control unit of the motor vehicle. The sensor signal can be the signal from an environmental sensor or a predictive sensor system. This makes it possible to react to it even before a triggering event occurs. The measurement signal also represents the further sensor signal. For example, the measurement signal can represent a plurality of sensor signals. The further sensor signal can also be understood as an external control signal.In principle, this allows for redundant control. Depending on the design of the control device, the external control signal is processed or ORed with the control signal of the control device and then output at the control interface.

[0023] In one embodiment, the control device includes its own energy storage device. This is particularly advantageous when the power supply is provided via a low-voltage energy storage device or the low-voltage vehicle electrical system to ensure functionality – even if the low-voltage energy storage device is empty or the electrical connection to it is interrupted, but the high-voltage power supply still carries voltage in the high-voltage range.

[0024] The energy storage device is designed to supply the control device and the measuring device with electrical energy. Furthermore, the energy storage device is designed to provide the triggering energy required for the pyrotechnic safety device. In an optional embodiment, the energy storage device also provides the sensor device with the electrical energy required for operation via the measuring device. In this embodiment, the supply interface is designed to charge the energy storage device of the control device using the applied electrical energy from the external energy storage device. In one variant, the measuring device and the control device are supplied via the energy storage device of the control device. This means that the supply can also be provided indirectly.

[0025] Depending on the design of the energy storage device, it can be partially or completely integrated into the circuit board. Furthermore, at least one energy storage management device can be integrated into the circuit board as part of the energy storage device.

[0026] The proposed control device is advantageously independent of external energy sources, as the energy required for operation and triggering the pyrotechnic safety device is stored in reserve. Additionally, the sensor device, together with the control device, provides the necessary information for operation. This creates a redundant power supply. The dedicated, configurable control unit enables use in various systems.

[0027] In an optional development, the control device can be configured to connect either the energy storage device or the external energy storage device to the pyrotechnic safety device. Thus, depending on the specific application, the triggering energy for the pyrotechnic safety device can be provided by one of the energy storage devices.

[0028] Furthermore, the control device can be configured to monitor the energy storage device. This allows the charging process of the energy storage device to be optimally controlled via the electrical energy present at the supply interface.

[0029] The energy storage device can comprise at least one capacitor, a battery, or a fuel cell. In an optional development, the energy storage device can comprise a combination of at least two of the aforementioned components. For example, a capacitor can be combined with a battery. The capacitor can provide a high energy density in the short term, whereas the battery can store the necessary electrical energy over a long period of time. For example, the battery can then also be used to repeatedly recharge the capacitor, thus improving the availability of the system. In this way, the advantages of different energy storage technologies can be combined and utilized.

[0030] The above explanations regarding the control device apply accordingly to a method. The device can be implemented in a single component or distributed across multiple components. Furthermore, the device can be integrated into an ASIC.

[0031] The solution presented here further comprises a computer program product that can be loaded directly into a memory of a digital computer, comprising program code parts that are suitable for carrying out steps of the method described here.

[0032] The above-described properties, features, and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more readily understood in conjunction with the following schematic description of exemplary embodiments, which are explained in more detail in conjunction with the drawings. For clarity, identical or equivalent elements may be provided with identical reference numerals. Short character description Fig. 1 shows a schematic block diagram of a control device for a pyrotechnic safety device according to an embodiment of the present invention; Fig. 2 shows a further schematic block diagram of the control device for a pyrotechnic safety device according to an embodiment of the present invention; Fig. 3 shows a schematic block diagram of a control device for a pyrotechnic safety device according to a further embodiment of the present invention; and Fig. 4 shows a schematic representation of a variant of the control device for a pyrotechnic safety device according to an embodiment of the present invention.

[0033] In the following, the inventive idea of the present invention is described in detail with reference to the figure and at least one embodiment.

[0034] Fig. 1 shows a schematic representation of a control device 100 for a pyrotechnic safety device 102 according to an exemplary embodiment of the present invention. The pyrotechnic safety device 102 is a safety device 102 for a high-voltage power supply 104 of a motor vehicle 106. A high-voltage power supply 104 is understood to mean a power supply with at least 48 V, but in particular greater than 480 V. In a preferred exemplary embodiment, the motor vehicle 106 is a motor vehicle 106 that has at least one electric drive, such as a hybrid, plug-in, fuel cell, or electric vehicle.

[0035] Pyrotechnic safety devices 102 are known. A corresponding control can be used to severe a busbar or a current conductor of the power supply 104. The control device 100 shown here comprises a sensor device 108, a measuring device 110, a control device 112, an energy storage device 114, and a supply interface 128. The sensor device 108 detects an operating state 116 of the power supply 104 of the motor vehicle 106 or directly an operating state 116 of the motor vehicle 106 and then provides a sensor signal 118 representing this operating state 116. The sensor signal 118 is detected by the measuring device 110 and provided to the control device 112 as a measurement signal 120 representing the sensor signal 118.One task of the control device 112 is to evaluate the measurement signal 120 and to provide a control signal 122 for controlling the pyrotechnic safety device 102 based on the evaluation of the measurement signal 120.

[0036] The energy storage device 114 serves to supply energy to the devices of the control device 100, that is, in particular, to provide electrical energy 124 for the control device 112 and the measuring device 110. Thus, the energy storage device 114 also provides sufficient trigger energy 126 for the pyrotechnic safety device 102. The trigger energy 126 is provided in the form of the control signal 122 by the control device 112.

[0037] The control device is supplied with electrical energy 124 via the supply interface 128. The energy storage device 114 is thus charged via the supply interface 128. The measuring device 110 and the control device 112 are also supplied with electrical energy 124 directly or indirectly via the supply interface 128. Thus, in a first exemplary embodiment, the devices of the control device 100 are supplied directly; in an alternative exemplary embodiment, the supply interface 128 serves only to charge the energy storage device 114, and the other devices of the control device 100 are then supplied with electrical energy 124 from there.

[0038] In order to be able to supply the devices of the control device 100 with electrical energy 124, the supply interface 128 can be connected to an external low-voltage energy storage device 130.

[0039] The objective of the sensor device 108 is to detect vehicle conditions that require the power supply 104 of the motor vehicle 106 to be switched off. These are, in particular, accident scenarios in which the applied currents and voltages would otherwise pose a danger to vehicle occupants or rescuers. Thus, on the one hand, the power supply 104 is directly monitored, and on the other hand, a corresponding vehicle condition is derived from movement information (acceleration / deceleration, rotation). As explained further below, information from other vehicle control units can also be used as additional information to further increase safety.

[0040] In one embodiment, the control device 100 is connected directly to the pyrotechnic safety device 102. This creates a very compact solution that also has the advantage that a triggering decision is made directly at the safety device 102, thus eliminating the need for additional cables that may be defective and prevent the triggering of the safety device 102. For space reasons, it may be necessary to install the device in the motor vehicle 106 separate from the pyrotechnic safety device 102. Short signal paths are ensured.

[0041] Fig. Figure 2 shows a further schematic representation of the control device 100 for a pyrotechnic safety device 102 according to an embodiment of the present invention. This may be a further development of the Fig. 1 shown control device 100.

[0042] In a preferred embodiment, the control device 100 comprises a housing 240. In this variant, the devices of the control device 100, i.e., the sensor device 108, the measuring device 110, the control device 112, and the energy storage device 114, are preferably arranged in the housing 240. The supply interface 128 is arranged as an external connection on the housing to connect the control device 100 to the external energy storage device 130. Furthermore, the housing 240 preferably has a further external connection in the form of a control interface 248 to connect the control device 100 to the pyrotechnic safety device 102.

[0043] In one embodiment, the sensor device 108 is preferably integrated into the measuring device 110. Thus, the measuring device 110 comprises the sensor device 108. In a preferred embodiment, this is achieved by arranging the measuring device 110 and the sensor device 108 on a common circuit board 242. In order to nevertheless achieve a certain degree of modularity, one variant provides for the sensor device 108 to be designed in a plug-in manner. This allows the sensor used to be adapted to the application during production. For example, gyro sensors, acceleration sensors, current sensors, or a voltage measurement are provided as the sensor device. Of course, sensors can also be combined in the sensor device, for example to detect current and voltage, or to combine a current measurement with an acceleration measurement.

[0044] In a further development, it is also provided to integrate the control device 112 on the circuit board 242 in order to realize cost advantages and also to be able to design the control device 100 in a particularly compact manner.

[0045] In the embodiment shown here, the pyrotechnic fuse 100 is capable of severing a current conductor of the power supply 104 and extinguishing the resulting arc. The pyrotechnics contained therein are ignited via an ignition current. This current must flow for a defined time. The measuring device 110 detects various parameters, such as current flow or acceleration, and transmits this information via a suitable interface to the control device 112. The control device 112 evaluates the information from the measuring device 110 and monitors the safety of the system. As soon as the defined limits of the system are exceeded, the Control device 112 is capable of igniting the pyrotechnics. To do so, the control device 112 connects an energy source 114, 130 to the igniter. The defined limits of the system can be freely defined depending on the application.

[0046] The energy storage device 114 is connected by the control device 112 to the pyrotechnic igniter, i.e., the pyrotechnic safety device 102, to activate the pyrotechnic safety device 102. The energy storage device 114 also serves as a power supply for the control device 112 and the measuring technology 108, 110. The energy storage device 114 can be charged by the external energy source 130. Capacitors can be used as energy storage devices to temporarily bridge failures in the external power supply, or battery cells can be used for long-term operation of the stand-alone solution. The advantage of the exemplary embodiment presented here is the modular design of the entire component. The pyrotechnic safety device thus has all the electrical and mechanical interfaces necessary to operate with or without additional modules.Depending on the application, the pyrotechnic fuse is extended with a module containing measuring technology 108, 110, control device 112 and / or energy storage.

[0047] In Fig. 1 and Fig. 2, the voltage supply is provided via the low-voltage voltage supply 130 of the motor vehicle 106.

[0048] A dedicated energy storage unit 114 ensures functionality. Alternatively, power can be supplied via the high-voltage power supply 104, which is illustrated as an example in the following figures. To improve readability, a description of subcomponents used in both variants has been omitted. However, they are explicitly included.

[0049] Fig. Figure 3 shows a schematic representation of a control device 100 for a pyrotechnic safety device 102 according to a further embodiment of the present invention. The control device 100 comprises a sensor device 108, a measuring device 110, a control device 112 and a supply interface 128. As already described in the description of Fig. 1, the sensor device 108 is preferably integrated into the measuring device 110.

[0050] In the Fig. In the embodiment shown in Figure 3, the supply interface 128 comprises a DC / DC converter connected to the voltage supply 104, which in the embodiment is a high-voltage voltage supply 104. During normal operation, the high-voltage voltage supply 104 provides a voltage of up to 1000 VDC. In terms of fuse technology, the high-voltage range is defined as a voltage of 60 VDC and above. Thus, one task of the pyrotechnic fuse device 102 is to provide fuse protection between 60 VDC and 1000 VDC. This results in the operating range of the DC / DC converter, which must cover this range. In order to integrate an additional safety buffer, in a preferred embodiment the operating range of the DC / DC converter extends to a lower limit of 50 VDC.

[0051] The operating range of the DC / DC converter 360 across the entire range of the high-voltage power supply 104 ensures that the control device 100 is always functional when a voltage dangerous to humans is present. This significantly increases the safety of the overall motor vehicle system 106 – especially in accident or similar situations.

[0052] The voltage of the high-voltage power supply 104 is converted by the DC / DC converter to the operating voltage of the control device 100. This ranges between 2.7 VDC and 12 VDC. In preferred embodiments, the operating voltage of the control device 100 is in a range of 2.7 VDC and 5.5 VDC or 7 VDC. A narrower operating range is between 3.3 VDC and 5.5 VDC, although a voltage value of, for example, 3.3 VDC or 5 VDC can also be fixed.

[0053] In the Fig. 3, the DC / DC converter 360 is connected to a busbar of the high-voltage power supply connected to the positive pole of the high-voltage storage device 362, or is looped into it in parallel, in order to supply the control device with electrical energy 124.

[0054] In a particularly preferred embodiment, the sensor device 108 or the sensor 246 is an acceleration sensor or a combined current-voltage sensor. Using the combined current-voltage sensor and a downstream comparator circuit in the control device 112, it is easy to monitor for a current greater than 2000 A and, at the same time, for an undervoltage of, for example, 400 VDC, 300 VDC, or the end of the high-voltage range of 60 VDC. Of course, these threshold values can be adapted to suit the specific application. The purpose is to reliably detect a short circuit in the power supply 104.

[0055] By evaluating a second current signal, leakage currents or problematic temperature increases can be evaluated, which can lead to a tripping decision.

[0056] Fig. Figure 4 shows a schematic representation of a variant of the control device 100 for a pyrotechnic safety device 102 according to an embodiment of the present invention. The control device 100 may be a variant of the embodiments of control devices 100 shown in the preceding figures.

[0057] The high-voltage power supply 104 is designed as a busbar 104. The pyrotechnic safety device 102 is arranged on the busbar 104. The control device 100 is also arranged directly on the busbar 104. Thus, the pyrotechnic safety device 102 and the control device 100 are connected via the busbar 104 and via a control signal line 422. The control signal line 422 is connected to the control interface 248 (not shown) with the control device 100 in order to transmit the control signal provided by the control device 100 for triggering the pyrotechnic safety device 102 to the latter. Fig. In the embodiment shown in Figure 4, the pyrotechnic safety device 102 and the control device 100 are arranged directly adjacent to the busbar.

[0058] In a further embodiment, not shown, a connection interface is arranged between the pyrotechnic safety device 102 and the control device 100 in order to be able to replace both components individually or together in the event of servicing. LIST OF REFERENCE SYMBOLS 100 control device 102 pyrotechnic safety device 104 Power supply 106 Motor vehicle 108 Sensor device 110 Measuring device 112 Control device 114 energy storage 116 Operating status 118 Sensor signal 120 measurement signal 122 control signal 124 electrical energy 126 trigger energy 128 supply interface 130 external energy storage (low-voltage energy storage) 218 additional sensor signal 240 housings 242 circuit board 244 Sensor interface 246 sensors 248 Control interface 360 DC / DC converters 362 high-voltage storage units 422 Control signal line

Claims

[1] Control device (100) for a pyrotechnic safety device (102) for a high-voltage power supply (104) of a motor vehicle (106), in particular a hybrid or electric vehicle, comprising the following devices: - a sensor device (108) for generating a sensor signal (118) relating to an operating state (116) of the high-voltage power supply (104) and / or the motor vehicle (106), - a measuring device (110) for detecting the sensor signal (118) and for providing a measuring signal (120) representing the sensor signal (118); - a control device (112) which is designed to control the pyrotechnic safety device (102) using the measurement signal (120) by means of a control signal (122); - an energy storage device (114) for supplying the control device (112) and the measuring device (110) with electrical energy (124) and for providing a triggering energy (126) for the pyrotechnic safety device (102); and - a supply interface (128) for supplying the control device (112) and the measuring device (110) with electrical energy (124), wherein the supply interface (128) is connectable to the high-voltage power supply (104), characterized by that the control device (112) is designed to monitor the energy storage device (114) and to control the charging process of the energy storage device (114) via the electrical energy (124) present at the supply interface (128). [2] Control device (100) according to claim 1, wherein the supply interface (128) comprises a DC / DC converter (360) which is designed to convert the electrical energy (124) from the high-voltage voltage supply (104) from a voltage range of the high-voltage voltage supply (104) greater than 50V, in particular between 50V and 1000V, into a range between 2.7V and 12V, in particular into a range between 3.3V and 7V, in particular advantageously into a range between 3.3V and 5.5V. [3] Control device (100) according to claim 2, wherein the DC / DC converter (360) of the supply interface (128) is connectable or connected to a B+ path of the high-voltage power supply (104). [4] Control device (100) according to one of the preceding claims, wherein the control device (100) has a housing (240) and the sensor device (108), the measuring device (110) and the control device (112) are arranged in the housing (240), wherein the supply interface (128) and a control interface (248) are attached to the housing (240) as external connections in order to connect the control device (100) to an external energy storage device (130; 362) arranged externally to the housing (240) and to the pyrotechnic safety device (102). [5] Control device (100) according to one of the preceding claims, wherein the sensor device (108) is integrated into the measuring device (110), in particular wherein the sensor device (108) is arranged on a printed circuit board (242) of the measuring device (110) and is connected thereto. [6] Control device (100) according to one of the preceding claims, wherein the sensor device (108) is a gyro sensor, a 2D acceleration sensor, a 3D acceleration sensor, an airbag sensor, a temperature sensor, a voltage sensor, a current sensor or a combined current-voltage sensor. [7] Control device (100) according to one of the preceding claims, wherein the measuring device (110) has a sensor interface (244) for reading in at least one further sensor signal (218) of a sensor (246) external to the control device (100), and wherein the measuring signal (120) further represents the further sensor signal (218). [8] Control device (100) according to one of the preceding claims, wherein the control device (112) is designed to switch the energy storage device (114) and / or external energy storage device (130) to the pyrotechnic safety device (102) in order to provide the triggering energy (126) for the pyrotechnic safety device (102). [9] Control device (100) according to one of the preceding claims Claims 8, wherein the energy storage device (114) comprises at least one capacitor, a battery, a fuel cell or a combination of at least two of said components.

Images