Abstract: The disclosure relates to a method for controlling an electrical system of an electrically drivable motor vehicle, wherein the electrical system includes at least one lead battery and at least one lithium battery. Initially, a lower and a first upper threshold value for a state of charge of the lithium battery are determined. Then, a second upper threshold value which is higher than the first upper threshold value is determined. During the driving operation of the motor vehicle, a state of charge of the lithium battery is set between a lower and a second upper threshold value. When the motor vehicle is switched off, the state of charge of the lithium battery is determined. If the state of charge of the lithium battery is higher than the first upper threshold value, the state of charge of the lithium battery is lowered to the first upper threshold value.

Abstract: A method for providing a power supply for at least one electrically heatable catalyst of a motor vehicle situated in an exhaust gas tract, wherein the motor vehicle comprises a first battery, by means of which a first voltage U1 is generated, and a second battery, by way of which a second voltage U2 is generated, wherein the at least one catalyst during a start phase immediately following the start of an internal combustion engine of the motor vehicle is supplied by a power P1 provided by the first battery such that the voltage U1 of the first battery is imposed on the at least one catalyst, wherein the at least one catalyst is additionally supplied during the start phase by a power P2 provided by the second battery such that the voltage U2 of the second battery is transformed by a DC converter to the value of the voltage U1 which is imposed on the at least one catalyst.

Abstract: A method for providing a power supply for at least one electrically heatable catalyst of a motor vehicle situated in an exhaust gas tract, wherein the motor vehicle comprises a first battery, by means of which a first voltage U1 is generated, and a second battery, by way of which a second voltage U2 is generated, wherein the at least one catalyst during a start phase immediately following the start of an internal combustion engine of the motor vehicle is supplied by a power P1 provided by the first battery such that the voltage U1 of the first battery is imposed on the at least one catalyst, wherein the at least one catalyst is additionally supplied during the start phase by a power P2 provided by the second battery such that the voltage U2 of the second battery is transformed by a DC converter to the value of the voltage U1 which is imposed on the at least one catalyst.

Abstract: A fastening element of an accessory part for a pail extends along a circular arc. The fastening element includes a first profile element having a U-shaped cross section and first and second profile legs. The legs are interconnected by a first profile web and arranged opposite one another. The profile legs have a first minimum distance from one another. The fastening element also includes a second profile element having a U-shaped cross section with third and fourth profile legs. Those are interconnected by a second profile web and are arranged opposite one another. The third and the fourth profile legs have a second minimum distance from one another. The second minimum distance is greater than the first minimum distance.

Abstract: The disclosure relates to a method for controlling an electrical system of an electrically drivable motor vehicle, wherein the electrical system includes at least one lead battery and at least one lithium battery. Initially, a lower and a first upper threshold value for a state of charge of the lithium battery are determined. Then, a second upper threshold value which is higher than the first upper threshold value is determined. During the driving operation of the motor vehicle, a state of charge of the lithium battery is set between a lower and a second upper threshold value. When the motor vehicle is switched off, the state of charge of the lithium battery is determined. If the state of charge of the lithium battery is higher than the first upper threshold value, the state of charge of the lithium battery is lowered to the first upper threshold value.

Abstract: An embodiment relates to a method for predicting a voltage dip in a vehicle electrical system before a planned start of a load in a motor vehicle. The embodiment operates to ascertain a value of supply current expected to be required after the start of the load. An electrical voltage source and an energy store connected in parallel to a voltage source via the vehicle electrical system provide the supply current for operating the load. The energy store blocks a charge current into the energy store or blocks a discharge current out of the energy store based on a vehicle electrical system voltage of the vehicle electrical system being greater than a maximum value. Based on an instantaneous value of the vehicle electrical system voltage, the embodiment further ascertains a proportion of the supply current that the voltage source generates as a source current without the energy store until the vehicle electrical system voltage has fallen to the maximum value.

Abstract: A method is disclosed for operating an electrical system of a motor vehicle, said electrical system comprising a first power source for providing an operating voltage for at least one partial onboard network of the electrical system and at least a second power source, wherein an electrically conductive connection of the first power source to the electrical system is monitored for an intentional interruption and, in the event of a detected intentional interruption of the electrically conductive connection, the at least one second power source of the electrical system is separated therefrom or deactivated. A motor vehicle with an onboard electrical system and a control device, for execution of the method, are also disclosed.

Abstract: A method for determining a performance information, including a capacity information, of a battery of a motor vehicle on-board power network connected to a DC converter is disclosed. The DC converter is configured to impress at least one AC current with at least one predetermined frequency into the on-board power network. The capacity information is derived from at least one first electrical parameter at an output of the DC converter to the on-board power network and from at least one second electrical parameter that describes a reaction of the battery to the impressed AC current. A motor vehicle configured to perform the method is also disclosed.

Abstract: A method for determining a performance information, including a capacity information, of a battery of a motor vehicle on-board power network connected to a DC converter is disclosed. The DC converter is configured to impress at least one AC current with at least one predetermined frequency into the on-board power network. The capacity information is derived from at least one first electrical parameter at an output of the DC converter to the on-board power network and from at least one second electrical parameter that describes a reaction of the battery to the impressed AC current. A motor vehicle configured to perform the method is also disclosed.

Abstract: A method is disclosed for operating an electrical system of a motor vehicle, said electrical system comprising a first power source for providing an operating voltage for at least one partial onboard network of the electrical system and at least a second power source, wherein an electrically conductive connection of the first power source to the electrical system is monitored for an intentional interruption and, in the event of a detected intentional interruption of the electrically conductive connection, the at least one second power source of the electrical system is separated therefrom or deactivated. A motor vehicle with an onboard electrical system and a control device, for execution of the method, are also disclosed.

Abstract: An embodiment relates to a method for predicting a voltage dip in a vehicle electrical system before a planned start of a load in a motor vehicle. The embodiment operates to ascertain a value of supply current expected to be required after the start of the load. An electrical voltage source and an energy store connected in parallel to a voltage source via the vehicle electrical system provide the supply current for operating the load. The energy store blocks a charge current into the energy store or blocks a discharge current out of the energy store based on a vehicle electrical system voltage of the vehicle electrical system being greater than a maximum value. Based on an instantaneous value of the vehicle electrical system voltage, the embodiment further ascertains a proportion of the supply current that the voltage source generates as a source current without the energy store until the vehicle electrical system voltage has fallen to the maximum value.

Abstract: A process to check a connection between a battery (2) supplying a low-voltage network (1) of a motor vehicle (12), the voltage of which is less than the voltage of a high-voltage network (6) of the motor vehicle (12), and the low-voltage network (1); wherein a DC voltage converter (5), which is configured for exchanging electrical power between the high-voltage network (6) and the low-voltage network (1), connects the high-voltage network (6) to the low-voltage network (1); wherein a DC voltage converter (5) modulates the output voltage into the low-voltage network at a modulation frequency; wherein the current hereby applied and the voltage hereby applied are measured by the battery (2), and a resistance value is determined and evaluated with respect to at least one connection criterion, according to which a connection fault is determined when at least one connection criterion is not fulfilled.

Abstract: A process to check a connection between a battery (2) supplying a low-voltage network (1) of a motor vehicle (12), the voltage of which is less than the voltage of a high-voltage network (6) of the motor vehicle (12), and the low-voltage network (1); wherein a DC voltage converter (5), which is configured for exchanging electrical power between the high-voltage network (6) and the low-voltage network (1), connects the high-voltage network (6) to the low-voltage network (1); wherein a DC voltage converter (5) modulates the output voltage into the low-voltage network at a modulation frequency; wherein the current hereby applied and the voltage hereby applied are measured by the battery (2), and a resistance value is determined and evaluated with respect to at least one connection criterion, according to which a connection fault is determined when at least one connection criterion is not fulfilled.