DE102012215980A1 - Electric control unit network device for driving electric drive of e.g. hybrid vehicles, sets drive output voltage of electric drive to lower voltage threshold value, during communication failure between battery and drive control unit - Google Patents

Abstract

A drive control unit (11) controls an electric drive (4), and a battery control unit (13) controls a high-voltage battery (6) of a high-voltage network (1). The drive control unit detects the failure of communication between battery and drive control unit. In case of failure, the drive output voltage of electric drive is set to lower voltage threshold value, according to the state of charge discharged from battery, while limiting the drive output current for charging the battery depending on maximum power consumption at the power output ports (3,5). Independent claims are included for the following: (1) an electric drive system; and (2) a method for controlling electric drive in high-voltage network.

Description

The invention relates to a control unit network and a method for controlling an electric drive and an electric drive system, in particular in electrically powered vehicles such as electric cars and hybrid vehicles.

State of the art

It is becoming apparent that in the future both stationary applications, e.g. Wind turbines or solar systems, as well as in vehicles such as hybrid or electric vehicles, increasingly electronic systems are used that combine new energy storage technologies with electric drive technology.

Drive systems for hybrid vehicles use electrical machines that are used in regenerative operation for recuperation of mechanical energy released during braking or when driving downhill. This additional electrical energy can be used, for example, to support the vehicle electrical system in order to reduce the fuel consumption of the hybrid vehicle.

Enables the electric machine by an inverter and a motor operation, the drive torque of the internal combustion engine can be temporarily increased by an additionally generated by the electric machine electrical torque, for example in a so-called "boost" operation. Furthermore, with appropriate recuperation power, the drive torque of the internal combustion engine can also be deliberately lowered and compensated for by a continuous electrical torque.

Rechargeable batteries, such as lithium-ion batteries, which serve as energy buffers for the recuperated energy, are frequently provided in high-voltage networks fed by such an electrical machine in generator mode. Especially in high-voltage networks, especially in high-voltage networks in hybrid vehicles with, for example, 42 volts or 48 volts high voltage, lithium-ion batteries are used with relatively low capacity for cost reasons. To protect these batteries against overcharging by the generator, it is necessary to use appropriate charging strategies in recuperation.

The publication DE 10 2006 001 201 A1 discloses a method for safely charging a rechargeable battery of a hybrid vehicle in the recuperation operation of a generator in which the generator voltage is dynamically adjusted to the charge state of the battery. For this purpose, battery parameters such as charging current and absorbed charge quantity are detected and monitored by a battery management system.

However, if the battery parameters can not be or are not sufficiently detected by the battery management system, for example, a communication failure of the battery management system with the battery, there is a need for alternative ways to safely operate the electric drive system without the battery being overcharged for its own protection must be shut down by the generator.

Disclosure of the invention

The present invention provides according to one aspect a control unit network for controlling an electric drive in a high-voltage network, with a drive control unit, which is designed to control the electric drive, and a battery control device which is adapted to drive a high-voltage battery of the high-voltage network, wherein the drive control device is configured to detect a failure or defect of the ECU communication between the battery control device and the drive control device, and to limit the drive output voltage of the electric drive to a voltage threshold, which corresponds to a rest voltage of up to a lower threshold state of charge upon a detected failure or defect of the ECU communication discharged high-voltage battery, as well as to limit the drive output current to a current threshold, which of a minimum charge for charging the high-voltage battery charging current and a maximum power consumption of one or more power sensors of the high-voltage network is dependent.

According to a further aspect, the present invention provides an electric drive system comprising a high voltage network, a low voltage network, a high voltage battery in the high voltage network, an electric drive having an inverter and an electrical machine and which supplies the high voltage network with a drive output voltage to one or more power sensors in the high-voltage network and a control unit network according to the invention for driving the electric drive, the drive control unit are coupled to the electric drive and its battery control unit with the high-voltage battery.

According to a further aspect, the present invention provides a method for driving an electric drive, in particular in a Failure of the control unit communication of the electric drive, for example, with a control unit of a high-voltage battery connected to the electric drive, with the steps of detecting a failure or defect of the control unit communication with a battery control unit of a high-voltage battery of the high-voltage network. Upon a detected failure or failure of the controller communication, limiting the drive output voltage of the electric drive to a voltage threshold corresponding to a standby voltage of the high voltage battery discharged to a lower threshold state of charge, and limiting limiting the drive output current to a current threshold that is dependent on a current threshold charging the high-voltage battery minimally necessary charging current and a maximum power consumption of one or more power sensors of the high-voltage network is dependent.

Advantages of the invention

One idea of the present invention is to implement an emergency running strategy in the event of a failure of the control unit communication with a battery control device of a high-voltage battery of a high-voltage network, which is fed by an electric machine in generator operation, through a suitable communication between electric drive and high-voltage battery via the high-voltage network Operating parameters of the battery can transmit to the electric drive. By means of the operating parameters of the battery determined in this way, corresponding operating parameters of the electric drive or of the electrical machine can be adapted in order to ensure the safety of the battery against overcharging.

This results in the advantage that the battery does not have to be switched off in the event of a communication failure, and a hazard due to critical or impermissible operating states of the battery can nevertheless be avoided. As a result, the runflat strategy can be temporarily maintained until it is possible to visit a workshop with the vehicle.

The inventive measures also a failure or defect of the battery management system, a stable operation of the high-voltage network are made possible, whereby "lying down", that is, the inability to drive the hybrid vehicle can be avoided with such an electric drive system. A safe onward journey and an increase in the availability of the electric drive system can be ensured by stabilizing the high-voltage network.

According to one embodiment of the control unit network according to the invention, the power sensors of the high-voltage network can include a DC-DC converter which couples the high-voltage network to the low-voltage network and which is designed to convert an instantaneous voltage of the high-voltage network into an operating voltage of the low-voltage network and / or high-voltage consumers of the high-voltage network.

According to a further embodiment of the control unit network according to the invention, one or more control units of the control unit network, for example a converter control unit and / or a high-voltage consumer control unit, can be designed to limit the maximum power consumption of the one or more power sensors to a maximum recording threshold value.

According to one embodiment of the drive system according to the invention, the control unit group may further comprise a low-voltage consumer control unit, which is designed to limit a power consumption of low-voltage consumers in the low-voltage network in the event of a detected or defective control unit communication. As a result, the maximum power consumption and thus the maximum current consumption of the DC-DC converter is limited, so that the total output current, which is generated by the electric drive, always remains so low that the charging current of the high-voltage battery always remains in the uncritical range.

According to one embodiment of the method according to the invention, the power sensors of the high-voltage network can include a DC-DC converter which couples the high-voltage network to the low-voltage network and which is designed to convert an instantaneous voltage of the high-voltage network into an operating voltage of the low-voltage network and / or high-voltage consumers of the high-voltage network.

According to a further embodiment of the method according to the invention, the method may further comprise the step of limiting the maximum current consumption of the one or more power sensors to a maximum recording threshold value. Thereby, the maximum current of the electric drive can be chosen so low that it is ensured that the total output current, which is generated by the electric drive, always remains so low that the charging current of the high-voltage battery always remains in the non-critical range.

Further features and advantages of embodiments of the invention will become apparent from the following description with reference to the accompanying drawings.

Brief description of the drawings

Show it:

1 a schematic representation of an electric drive system of a hybrid vehicle according to an embodiment of the present invention;

2 a schematic representation of a signal diagram with Ansteuersignalverläufen for an electric drive system according to 1 according to another embodiment of the present invention;

3 a schematic representation of a first method for driving an electric drive according to another embodiment of the present invention; and

4 a schematic representation of another method for driving an electric drive according to another embodiment of the present invention.

High-voltage networks in the sense of the present invention may be network areas in which a nominal voltage that is high in comparison to a vehicle electrical system voltage prevails. In particular, high-voltage networks can have high-voltage voltages of more than 100 volts. For electric drive systems with entry hybridization, the high voltage can also be less than 100 volts, in particular less than 60 volts, for example 42 or 48 volts. In these high-voltage networks a lesser effort to secure the system against accidental touches by users of the hybrid vehicle is necessary.

In contrast, low-voltage networks in the sense of the present invention may comprise, for example, electrical systems of electrically operated vehicles, which are operated in a lower voltage range than the high-voltage networks, for example 12 volts or 14 volts.

An electric drive in the sense of the present invention is understood to be a unit comprising an electrical machine and an inverter. In this case, the electric machine can feed the inverter in a generator operation, which converts the corresponding output voltage of the electrical machine into a desired output voltage of the electrical drive, that is, a drive output voltage. For motor operation, the inverter can provide a corresponding input voltage for the power supply of the electrical machine.

1 shows a system 100 which is a high voltage network 1 has that via a DC-DC converter 3 with a low voltage network 2 is coupled. The low voltage network 2 can be operated with 14 volts operating voltage, for example, the high-voltage network 1 with 48 volts high voltage. The high voltage network 1 can be an electric drive 4 exhibit. The electric drive 4 For example, a unit from an inverter 4a and an electric machine 4b be. The inverter 4a For example, it can also be replaced by a passive rectifier. With the help of an inverter 4a can the electric machine 4b be operated in a motor operation, that is, the electric machine 4b can be used to deliver electrical power to assist the internal combustion engine of the hybrid vehicle.

The electric machine 4b may comprise an electrically excited synchronous machine, for example a claw-pole machine. However, it may also be possible to use other electrical machines 4b such as permanent-magnet machines or reluctance machines in the electric drive 4 use. In generator operation of the electric machine 4b For example, the power of the generator in an electrically excited machine can be set via the excitation field and this in turn by the exciting current. The generator controller controls the excitation current such that the desired output voltage of the generator is fed into the high-voltage network. In generator operation of the electric machine 4b In this type of active rectification, an increase in the extracted power of the electric machine is achieved 4b an increase of the excitation field, that is the excitation current, necessary. However, due to the inductance of the rotor of the synchronous machine, the rate of change of the exciting current is subject to an inherent upper limit of variation. Thus, the control dynamics of the generator is limited to a load change, and in particular load jumps.

The high voltage network 1 also includes high-voltage consumers 5 which may be connected in parallel or in series. The high-voltage consumers 5 For example, heating consumers 5a or electronic power steering 5k be. The number of high-voltage consumers 5 is in 1 shown with two, but any other number is also possible. In addition, the high-voltage consumers 5 also selective in the high-voltage network 1 be switched on or off. The high-voltage consumers 5 thus provide load-variable power sensors of the high-voltage network 1 represents.

The high voltage network 1 can continue a high-voltage battery 6 have, for example, a lithium-ion battery. The high-voltage battery 6 can in normal operation of the system 100 Voltage peaks or voltage dips in the high-voltage network 1 temporarily compensate or record. The high-voltage battery 6 For example, via a battery control unit 13 which battery parameters such as state of charge (SOC), instantaneous charging current, terminal voltage or similar parameters can be detected. The battery control unit 13 For example, in an in 1 illustrated control unit network 10 includes his. The battery control unit can do this 13 for example, in the high-voltage battery 6 be integrated as an electronic component.

The control unit network 10 includes a variety of control devices 11 . 12 . 13 . 14 and 15 for respective components in the low-voltage network 2 and / or in the high-voltage network 1 , For example, the electric drive 4 via a drive control unit 11 , the high-voltage consumers 5 via a high-voltage consumer control unit 12 , the high-voltage battery 6 via the battery control unit 13 , the DC-DC converter 3 via a converter control unit 14 and low-voltage consumers 8th of the low voltage network 2 via a low-voltage consumer control unit 15 feature. It can do this for any of the controllers 11 to 15 be possible in the respectively assigned component of the system 100 to be integrated. The controllers 11 to 15 can communicate with the respectively assigned components. Here are the controllers 11 to 15 designed, as appropriate, depending on control data provided by other of the control units 11 to 15 via a common bus system 10a can be received to control the respective associated components. For example, the controller 11 the power electronics of the inverter 4a to control the setting of an output voltage.

The controllers 11 to 15 operate with each other via the bus system 10a a control unit communication, for example via a CAN bus ("controller area network"), a LIN bus ("local interconnect network") or a serial peripheral interface (SPI, "serial peripheral interface"). This communication can fail or be disturbed, for example in the event of a bus system driver failure or a malfunction of the communication functionality within one or more control devices 11 to 15 ,

The low voltage network 2 includes, for example, a low-voltage battery 9 , for example, a 14-volt lead-acid battery, low-voltage consumer 8th , such as vehicle electronics 8a , a radio 8k or the like, and optionally a starter 7 , The number of low-voltage consumers 8th is in 1 shown with two, but any other number is also possible. In addition, the low-voltage consumers 8th also selective in the low-voltage network 2 be switched on or off. The low-voltage consumers 8th thus provide load-variable power sensors of the low-voltage network 2 represents.

The high voltage network 1 is with the low voltage network 2 via a DC-DC converter 3 coupled, which is designed to the low-voltage network 2 with a low-voltage, for example, 14 volts, from the high-voltage network 1 to supply. For this purpose, the DC-DC converter 3 a target voltage can be specified, which he adjusts. The current I _out on the low-voltage side results from the current load of the low-voltage network 2 , that is, from the number and the operating state of the connected low-voltage consumers 8th and the state of charge of the low-voltage battery 9 , At constant load the value of the input current I _depends therefore inversely proportional to the input voltage at the input of the DC-DC converter 3 from.

For charging the high-voltage battery 6 depends the required charging current I of the terminal voltage U _K , that is, the voltage applied to the output terminals, on the one hand, and the rest voltage U ₀ , that is, the voltage that occurs in the battery at long power loss, on the other hand from. This results in dependence on the internal resistance R of the high-voltage battery 6 the following relationship: I = (U _K - U ₀ ) / R.

The quiescent voltage U _0, in turn, depends on the state of charge of the high-voltage battery 6 from. If the high-voltage battery 6 consists of several series-connected single cells, such as nickel-cobalt-manganese cells, iron phosphate cells, nickel-cobalt-aluminum cells or similar cell chemistry, the quiescent voltage U _{0 increases} monotonically with the state of charge. For a fully discharged high-voltage battery 6 For example, the rest voltage U _{0 can be} only about 60% of the rest voltage U ₀ in the fully charged state.

Via the drive control unit 11 can be the output voltage of the electric drive 4 be set in generator mode according to a target voltage specification to the high-voltage battery 6 to load. For this purpose, it is necessary to set the target voltage as a function of the battery control unit 13 to determine the boundary conditions or operating parameters to be transmitted. In case of communication failure with the battery control unit 13 For example, in case of malfunction of a software module of the battery control unit 13 , in case of failure of the bus system 10a or other control devices within the ECU network 10 or in a dropped connection cable, this form of regulation of the electric drive 4 not possible anymore.

To now the high-voltage battery 6 not from the high-voltage network 1 to have to separate and yet safe operation of the electric drive system 100 To enable it, it is necessary to use the electric drive 4 otherwise to regulate, overcharging and thus the occurrence of safety-critical or critical operating conditions of the high-voltage battery 6 to avoid. In particular, for lithium-ion batteries with relatively low capacity can in the high-voltage network 1 a maximum generator current can be generated by the electric drive, which can lead to overcharging of the battery within a short time. In the case of batteries, a characteristic quantity is the so-called C rate, which denotes the ratio between current in amperes and capacity in ampere-hours. The C-rate limits the permissible charging current. For example, a maximum C rate of 4 means that a 5 Ah battery can be charged with a maximum of 20 A charge current.

In high-voltage networks, it may be due to the design of electrical machine 4b and the high-voltage battery 6 come to C-rates that are between 20 and 60, that is, a charging current, the short-term to a high-voltage battery 6 low capacity may be applied to prevent severe heating and damage to the battery. In order to avoid such high C-rates, it is advantageous to adapt a charging voltage to the current battery voltage.

3 shows a schematic representation of an exemplary method 30 for driving an electric drive, with which an emergency running strategy in an electric drive system, in particular the electric drive system 100 , as related to the 1 explained, can be implemented. To implement the procedure 30 For example, the ECU network 10 in 1 be used.

In a first step 31 there is a detection of a failure or defect of a control unit communication of the high-voltage battery 6 a high-voltage network 1 , In case of detected failure or defect of the ECU communication can in one step 32 then limiting the drive output voltage of the electric drive 4 carried out to a voltage threshold, which a rest voltage of the discharged to a lower threshold of the state of charge high-voltage battery 6 equivalent. The voltage threshold can be selected so that regardless of the state of charge of the high-voltage battery 6 no inadmissibly high charging currents I _B flow into the battery. For example, the lower threshold of the state of charge can be 30% of the maximum possible state of charge, below which the high-voltage battery 6 should not discharge to damage the high-voltage battery 6 submissions. With such a lower threshold, a quiescent voltage is connected, at least at the terminals of the high-voltage battery 6 should be present in order to avoid further unloading below the lower threshold. If the drive output voltage is set to a value that corresponds to this open circuit voltage, it can be ensured that the state of charge of the high-voltage battery 6 at least kept constant at the lower threshold.

In addition, in one step 33 limiting the drive output current I _G to a current threshold, which is one of charging the high-voltage battery 6 minimally necessary charging current I _B and a maximum power consumption of one or more power sensors, that is, the DC-DC converter 3 or the high-voltage consumer 5 the high-voltage network 1 is dependent. The limitation of the maximum power consumption can be achieved by one or more control units of the control unit network 10 For example, the converter control unit 14 and / or the high-voltage consumer control unit 12 , respectively. In this case, the converter control unit 14 the maximum current consumption of the DC-DC converter 3 limit to a maximum pickup threshold. Similarly, the high-voltage consumer control unit 12 the maximum power consumption of one or more high-voltage consumers 5 limit to a maximum pickup threshold. Since the drive output current I _{G of} the electric drive 4 is known or can be measured at any time, the maximum drive output current I _G for the electric drive 4 be set. This maximum drive output current I _G , for example, as the sum of the maximum possible power consumption of the DC-DC converter 3 , the maximum possible power consumption of high-voltage consumers 5 as well as the minimum necessary current consumption of the high-voltage battery 6 be formed. It may be possible, for example, the current consumption of high-voltage consumers 5 to zero to the maximum drive output current I _{G of} the electric drive 4 keep as low as possible. The maximum possible current consumption of the DC-DC converter 3 can be lowered, for example, that the maximum power or current consumption I _N of low-voltage consumers 8th in the low voltage network 2 is limited to a maximum absorption threshold value. This means that non-safety-relevant consumers, such as PTC heating elements or seat heaters remain switched off at least temporarily in case of failure or defect of the control unit communication. In addition, the DC-DC converter 3 in principle, in its maximum power consumption from the high-voltage network 1 be limited. Even in the worst case, that is, when the current consumption of the DC-DC converter 3 is minimal, the maximum charging current I _B from the electric drive 4 in the high-voltage battery 6 flows are limited to as low a level as possible.

This method 30 has the advantage that even in emergency operation in case of defects of the ECU communication, the high-voltage battery 6 can be maintained at a safe state of charge level without overcharging the high voltage battery 6 threatening.

4 shows a schematic representation of another exemplary method 40 for driving an electric drive, with which an emergency running strategy in an electric drive system, in particular the electric drive system 100 , as related to the 1 explained, can be implemented. To implement the procedure 40 can also be the ECU network 10 in 1 be used.

The procedure 40 is described below in connection with the in 2 schematically illustrated signal diagram 20 with the Ansteuersignalverläufen 21 . 22 and 23 explained. The drive signal course 21 shows an exemplary voltage drive signal for the electric drive 4 from the drive system 100 in 1 , The drive signal course 22 shows an exemplary current control signal for power sensors from the high-voltage network 1 , that is, for the DC-DC converter 3 and the high-voltage consumers 5 from the drive system 100 in 1 , The drive signal course 23 Finally, an exemplary voltage drive signal for the high-voltage battery is shown 6 from the drive system 100 in 1 , It should be clear that the respective Ansteuersignalverläufe 21 . 22 and 23 have only exemplary character, and different implementation may also be possible.

In a first step 41 of the procedure 40 Initially, a failure or defect of a control unit communication of the high-voltage battery is detected 6 a high-voltage network 1 , In case of detected failure or defect of the ECU communication can in one step 42 then generating a pulse pattern on the high voltage network 1 through the electric drive 4 respectively. The pulse pattern, for example, the in 2 exemplified pulse pattern 21a the Ansteuersignalverlaufs 21 correspond. The electric drive generates this 4 one or more voltage or current pulses in a rectangular shape with a predetermined pulse duration, for example 2 seconds, and a predetermined time interval, for example also 2 seconds. The DC-DC converter 3 and optionally the high-voltage consumers 5 recognize this pulse pattern and switch in step 42 of the procedure 40 as in the Ansteuersignalverlauf 22 shown by way of example. The turn-off period during which the DC-DC converter 3 and optionally the high-voltage consumers 5 shut off, can be set and for example be about 15 seconds.

In one step 43 of the procedure 40 can the electric drive 4 then during the turn-off period of the DC-DC converter 3 and optionally the high-voltage consumer 5 - At least approximately - the battery break-in voltage or the Batterieruhespannung the high-voltage battery 6 measure and therefrom determine a voltage threshold to which the drive output voltage of the electric drive 4 is limited. The voltage threshold value can be, for example, a quiescent voltage of the high-voltage battery discharged to a lower threshold state of charge 6 as in the context of the procedure 30 explained above. In addition to this, the electric drive 4 specifically set a drive output voltage and the actual charging current I _B in the high-voltage battery 6 determine. In particular, the voltage threshold may be used to derive a voltage setpoint to which the drive output voltage may be limited.

The steps 41 to 43 can thereby by the electric drive 4 be repeated at periodic intervals, for example every 5 minutes, to the battery break-in voltage or the Batterieruhespannung the high-voltage battery 6 to update. This can ensure that the voltage threshold to the current state of charge of the high-voltage battery 6 remains adjusted.

Optionally, in the steps 44a and 44b in each case an answer pulse pattern to that by the electric drive 4 generated pulse pattern 21a through the high-voltage battery 6 be issued. As an example in the control signal waveform 23 shown, the high-voltage battery can in one step 44a after detecting that the DC-DC converter 3 and optionally the high-voltage consumers 5 properly shut down for a predetermined (short) first battery shutdown period, to confirm that the DC-DC converter 3 and optionally the high-voltage consumers 5 are actually turned off. This allows the electric drive 4 recognize that during the first battery shutdown of the battery current I _{B is} momentarily zero and the measurement of the battery run-in voltage or the battery booster voltage of the high-voltage battery 6 can be done properly.

In one step 44b can the high-voltage battery 6 after the turn-off period again spend a response pulse pattern, for example, by the high-voltage battery 6 itself for a predetermined (short) second battery shutdown time to confirm that the DC-DC converter 3 as well as the high-voltage consumers 5 in fact, were properly shut down during the shutdown period, that is, whether the battery current was actually zero during the interval between the first and second battery shutdown periods. As a result, the electric drive, the validity of the obtained detection results for the battery interlocking voltage or the Batterieruhespannung and optionally the charging current I _B in the high-voltage battery 6 to verify.

Due to the high lift of the battery booster voltage as a function of the state of charge can from the battery supply voltage to the state of charge of the high-voltage battery 6 getting closed. By the regular or periodic measurement of the battery line voltage, the electric drive 4 adjust the threshold for the drive output voltage better to a predetermined Zielladezustand the high-voltage battery 6 reliable and without danger or damage to the high-voltage battery 6 to reach. The procedure 40 has the advantage that the variable load capacity of the DC-DC converter 3 and optionally the high-voltage consumer 5 in determining the state of charge of the high-voltage battery 6 disregarded. This enables safe operation of the high-voltage battery 6 even in the event of a failure, malfunction or defect in the communication of the battery control unit 13 with other controllers 11 . 12 . 14 or 15 of the control unit network 10 without the high-voltage battery 6 due to the risk of high charging currents would have to be turned off.

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• DE 102006001201 A1 [0006]

Claims (9)

ECU network ( 10 ) for driving an electric drive ( 4 ) in a high-voltage network ( 1 ), comprising: a drive control device ( 11 ), which is adapted to the electric drive ( 4 ) head for; and a battery control device ( 13 ), which is designed to be a high-voltage battery ( 6 ) of the high-voltage network ( 1 ), wherein the drive control device ( 11 ) is designed to prevent a failure or defect of the ECU communication between the battery control device ( 13 ) and the drive control unit ( 11 ) and, in the event of a detected failure or defect of the control unit communication, the drive output voltage of the electric drive ( 4 ) to a voltage threshold, which corresponds to a rest voltage of the high-voltage battery discharged to a lower threshold state of charge ( 6 ), as well as limiting the drive output current to a current threshold, which depends on one for charging the high-voltage battery ( 6 ) minimally necessary charging current and a maximum current consumption of one or more power sensors ( 3 ; 5 ) of the high-voltage network ( 1 ) is dependent. ECU network ( 10 ) according to claim 1, wherein the power sensors ( 3 ; 5 ) of the high-voltage network ( 1 ) a DC-DC converter ( 3 ), which the high-voltage network ( 1 ) with the low-voltage network ( 2 ), and which is adapted to a current voltage of the high-voltage network ( 1 ) in an operating voltage of the low-voltage network ( 2 ), and / or high-voltage consumers ( 5 ) of the high-voltage network ( 1 ). ECU network ( 10 ) according to one of claims 1 and 2, wherein one or more control devices ( 12 ; 14 ) of the control unit network ( 10 ) are designed to determine the maximum current consumption (I _in ; I _H ) of the one or more power sensors ( 3 ; 5 ) to limit to a maximum pickup threshold. Electric drive system ( 100 ), with: a high-voltage network ( 1 ); a low-voltage network ( 2 ); a high-voltage battery ( 6 ) in the high-voltage network ( 1 ); an electric drive ( 4 ), which is an inverter ( 4a ) and an electric machine ( 4b ), and which is designed, in generator operation, the high-voltage network ( 1 ) with a drive output voltage to feed; one or more beneficiaries ( 3 ; 5 ) in the high-voltage network ( 1 ); and a control unit network ( 10 ) according to one of claims 1 to 3, whose drive control device ( 11 ) with the electric drive ( 4 ) and its battery control device ( 13 ) with the high-voltage battery ( 6 ) are coupled. Electric drive system ( 100 ) according to claim 4, wherein the power sensors ( 3 ; 5 ) of the high-voltage network ( 1 ) a DC-DC converter ( 3 ), which the high-voltage network ( 1 ) with the low-voltage network ( 2 ), and which is adapted to a current voltage of the high-voltage network ( 1 ) in an operating voltage of the low-voltage network ( 2 ), and / or high-voltage consumers ( 5 ) of the high-voltage network ( 1 ). Electric drive system ( 100 ) according to claim 5, wherein the control unit network ( 10 ), a low-voltage control unit ( 15 ), which is designed, in the case of a detected failure or defect of the control unit communication, a power consumption of low-voltage consumers ( 8th ) in the low-voltage network ( 2 ) to limit. Procedure ( 30 ) for driving an electric drive ( 4 ) in a high-voltage network ( 1 ), with the steps: Capture ( 31 ) a failure or defect of the ECU communication with a battery control device ( 13 ) of a high-voltage battery ( 6 ) of the high-voltage network ( 1 ); and in the event of a detected or defective ECU communication: limiting ( 32 ) of the drive output voltage of the electric drive ( 4 ) to a voltage threshold which corresponds to a rest voltage of the high-voltage battery discharged to a lower threshold state of charge ( 6 ) corresponds; and limiting ( 33 ) of the drive output current to a current threshold, which of one for charging the high-voltage battery ( 6 ) minimally necessary charging current and a maximum current consumption of one or more power sensors ( 3 ; 5 ) of the high-voltage network ( 1 ) is dependent. Procedure ( 30 ) according to claim 7, wherein the power sensors ( 3 ; 5 ) of the high-voltage network ( 1 ) a DC-DC converter ( 3 ), which the high-voltage network ( 1 ) with the low-voltage network ( 2 ), and which is adapted to a current voltage of the high-voltage network ( 1 ) in an operating voltage of the low-voltage network ( 2 ), and / or high-voltage consumers ( 5 ) of the high-voltage network ( 1 ). Procedure ( 30 ) according to one of claims 7 and 8, further comprising the step of limiting the maximum current consumption (I _in ; I _H ) of the one or more power sensors ( 3 ; 5 ) to a maximum pickup threshold.

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