Abstract: In a method for operating an electric vehicle, including an electrical drive device for driving the vehicle, a control device for controlling the driving of the vehicle, a first energy storage device for supplying the control device with a first DC voltage, a second energy storage device for supplying the drive device with a second DC voltage, and an energy supply unit providing an output DC voltage, the first energy storage device is connected to the energy supply unit via a converter device, the second energy storage device is connected to the energy supply unit, the converter device converts the output DC voltage into the first DC voltage, a first power flow from the first energy storage device to the second energy storage device is prevented and a second power flow from the second energy storage device to the first energy storage device is prevented.

Abstract: The present disclosure involves systems, software, and computer implemented methods for configuring graph query parallelism for high system throughput. One example method includes receiving a query to be executed against a graph database. System properties are determined of a system in which the query is to be executed. Algorithmic properties are determined of at least one algorithm to be used to execute the query. Graph data statistics are determined for the graph database. Graph traversal estimations are determined for a first iteration of the graph query and an estimated cost model is determined for the first iteration based on the graph traversal estimations. Estimated thread boundaries are determined for performing parallel execution of the first iteration. Work packages of vertices to be processed during the execution of the first iteration are determined based on the first estimated cost model and the work packages are provided to a work package scheduler.

Abstract: A method may include receiving a workspace definition defining a graph workspace for a heterogeneous graph having a plurality of vertex tables and/or edge tables. Upon validating the workspace definition, the graph workspace for the heterogeneous graph may be created in accordance with the workspace definition. The graph workspace may include a label for each table of the plurality of vertex tables and/or edge tables comprising the heterogeneous graph. Each vertex and edge of the heterogeneous graph may be uniquely identified based on a label of a corresponding table and one or more key attributes. A graph processing algorithm operating on the heterogeneous graph may be executed based on the graph workspace. Related systems and computer program products are also provided.

Abstract: A method may include generating, for a heterogeneous graph comprising a plurality of vertex tables and/or edge tables, an adjacency structure including a vertex adjacency structure specifying a plurality of neighboring vertices in the heterogeneous graph and an edge adjacency structure specifying a plurality of neighboring edges in the heterogeneous graph. A graph processing algorithm operating on the heterogeneous graph may be executed based on the adjacency structure. Related systems and computer program products are also provided.

Abstract: An electric vehicle includes an electric drive device, first and second energy storage devices, and a bidirectional DC converter. The drive device, the DC converter, and the second energy storage device are connected to each other via a common intermediate circuit. The intermediate circuit includes an intermediate circuit voltage, the first energy storage device includes a storage voltage and is connected to the intermediate circuit via the DC converter. The drive device is supplied with drive energy by the first and/or second energy storage device. The intermediate circuit voltage is converted into the storage voltage in a first converter direction by the DC converter. The storage voltage is converted into the intermediate circuit voltage in a second converter direction by the DC converter. The first converter direction is activated when charging the second energy storage device and is deactivated when discharging the second energy storage device.

Abstract: A method may include accessing a cache storing a graph index corresponding to a graph data in response to a transaction operating on the graph data. A cache miss triggered by a change to the underlying graph data may be detected. In response to detecting the cache miss, the graph index may be updated by at least replaying or rewinding one or more other changes made to the graph data by one or more other transactions between a first time of the transaction and a second time of a current version of the graph index in the cache. The graph index may be updated to avoid a full rebuild of the graph index. The transaction may be executed based on the updated graph index. Related systems and computer program products are also provided.

Abstract: In a method for operating an electric vehicle and an electric vehicle, including an electric traction drive device for driving vehicle, a control device for controlling the driving, a first energy storage device, for supplying the control device using a first DC voltage, a second energy storage device, for supplying the traction drive device using a second DC voltage, and an energy supply unit for providing an output DC voltage, the first energy storage device is connected to the second energy storage device via a converter device, the first energy storage device is connected to the energy supply unit, the converter device converts the first DC voltage into the second DC voltage, and a power flow from the second energy storage device to the first energy storage device is prevented.

Abstract: The present disclosure involves systems, software, and computer implemented methods for configuring graph query parallelism for high system throughput. One example method includes receiving a query to be executed against a graph database. System properties are determined of a system in which the query is to be executed. Algorithmic properties are determined of at least one algorithm to be used to execute the query. Graph data statistics are determined for the graph database. Graph traversal estimations are determined for a first iteration of the graph query and an estimated cost model is determined for the first iteration based on the graph traversal estimations. Estimated thread boundaries are determined for performing parallel execution of the first iteration. Work packages of vertices to be processed during the execution of the first iteration are determined based on the first estimated cost model and the work packages are provided to a work package scheduler.

Abstract: In a method for operating an electric vehicle, including a first energy storage device (e.g., a rechargeable battery storage device), a second energy storage device (e.g., a double-layer capacitor device), an energy supply unit which provides energy, for charging the first and/or second energy storage device, and a first electrical consumer connected to the second energy storage device via an intermediate circuit, the first energy storage device is connected to the energy supply unit via a bidirectional converter unit, the second energy storage device is connected to the energy supply unit, a first power flows from the first energy storage device to the second energy storage device if an intermediate circuit voltage falls below a definable voltage, and a second power flow from the second to the first energy storage device is prevented.

Abstract: In a method for operating an electric vehicle, including an electrical drive device for driving the vehicle, a control device for controlling the driving of the vehicle, a first energy storage device for supplying the control device with a first DC voltage, a second energy storage device for supplying the drive device with a second DC voltage, and an energy supply unit providing an output DC voltage, the first energy storage device is connected to the energy supply unit via a converter device, the second energy storage device is connected to the energy supply unit, the converter device converts the output DC voltage into the first DC voltage, a first power flow from the first energy storage device to the second energy storage device is prevented and a second power flow from the second energy storage device to the first energy storage device is prevented.

Abstract: An energy store includes a storage module having a fan. The fan is arranged as a radial fan, and channels extend through the storage module, e.g., axially, open into a spatial region which is delimited by a cover part of the energy store connected to the storage module and the storage module. The cover part has a recess extending through the cover part, e.g., axially, which is covered by the fan, e.g., by the suction region of the fan, e.g., on the side of the cover part facing away from the storage module, and the energy store has a deflection hood, e.g., for deflecting the conveyed air flow in the axial direction, on the side of the cover part facing away from the storage module.

Abstract: An energy store includes a housing and bridge plug. In relation to the housing, the bridge plug is receivable by the housing in two orientations different from each other, e.g., in the same opening or configuration of openings.

Abstract: In a system and method for operating a system having a rectifier which is suppliable from an electric AC-voltage supply network, an inverter which feeds an electric motor, and a DC/DC converter which is connected to an energy accumulator, the DC-voltage side connection of the inverter is connected to the DC-voltage side connection of the rectifier, in particular, the electric motor is supplied from the AC-voltage side connection of the inverter, a first DC-voltage side connection of the DC/DC converter is connected to the DC-voltage side connection of the rectifier, in particular, the DC-voltage side connection of the inverter and the first DC-voltage side connection of the DC/DC converter are connected in parallel, the DC/DC converter has a housing in which a device for current acquisition is situated, which acquires either the current, in particular network phase currents, flowing into the rectifier at the AC-voltage side connection of the rectifier, or the current emerging from the rectifier at the DC-volt

Abstract: A fan arrangement includes a fan and toothed ring, and a converter motor includes a fan arrangement. The fan includes a base body on which fan blades are premolded, and the fan includes an annular region, which is premolded on the side of the fan blades facing away from the base body. The toothed ring is situated within the annular region, and thus, in particular, is set apart from the base body, and thus, in particular, is set apart from the base body via the fan blades.

Abstract: In a system and method for operating a system, which includes a first inverter which feeds a first electric motor, and a second inverter which feeds a second electric motor, the DC-voltage side connection of the first inverter is connected to the DC-voltage side connection of a rectifier which is supplied from an electrical AC-voltage supply network, the DC-voltage side connection of the second inverter is connected to the DC-voltage side connection of the rectifier, in particular, the two DC-voltage side connections of the inverters are switched in parallel, and a controller is provided, in particular in the first inverter, which controls the current accepted and acquired by the first inverter at its DC-voltage side terminal toward a setpoint value in that the torque of the first electric motor fed by the first inverter is the controlled variable.

Abstract: In a system and method for operating a system, which includes a first inverter which feeds a first electric motor, and a second inverter which feeds a second electric motor, the DC-voltage side connection of the first inverter is connected to the DC-voltage side connection of a rectifier which is supplied from an electrical AC-voltage supply network, the DC-voltage side connection of the second inverter is connected to the DC-voltage side connection of the rectifier, in particular, the two DC-voltage side connections of the inverters are switched in parallel, and a controller is provided, in particular in the first inverter, which controls the current accepted and acquired by the first inverter at its DC-voltage side terminal toward a setpoint value in that the torque of the first electric motor fed by the first inverter is the controlled variable.

Abstract: In a system and method for operating a system having a rectifier which is suppliable from an electric AC-voltage supply network, an inverter which feeds an electric motor, and a DC/DC converter which is connected to an energy accumulator, the DC-voltage side connection of the inverter is connected to the DC-voltage side connection of the rectifier, in particular, the electric motor is supplied from the AC-voltage side connection of the inverter, a first DC-voltage side connection of the DC/DC converter is connected to the DC-voltage side connection of the rectifier, in particular, the DC-voltage side connection of the inverter and the first DC-voltage side connection of the DC/DC converter are connected in parallel, the DC/DC converter has a housing in which a device for current acquisition is situated, which acquires either the current, in particular network phase currents, flowing into the rectifier at the AC-voltage side connection of the rectifier, or the current emerging from the rectifier at the DC-volt

Abstract: In a system and method for operating a system having a rectifier which is supplyable from an electric AC-voltage supply network, an inverter which feeds an electric motor, and a DC/DC converter which is connected to an energy accumulator, the DC-voltage side connection of the inverter is connected to the DC-voltage side connection of the rectifier, in particular, the electric motor is supplied from the AC-voltage side connection of the inverter, a first DC-voltage side connection of the DC/DC converter is connected to the DC-voltage side connection of the rectifier, in particular, the DC-voltage side connection of the inverter and the first DC-voltage side connection of the DC/DC converter are connected in parallel, the DC/DC converter has a housing in which a device for current acquisition is situated, which acquires either the current, in particular network phase currents, flowing into the rectifier at the AC-voltage side connection of the rectifier, or the current emerging from the rectifier at the DC-volt

Abstract: A system, a method, and computer program product for performing buffering operations. A data update is received at a buffering location. The buffering location includes a first buffer portion and a second buffer portion. The data update includes an address tag. The buffering location is communicatively coupled to a memory location configured to receive the data update. A target address of the data update in the memory location is determined using the first buffer portion and compared to the address tag. The data update is applied using the first buffer portion to update data in the first buffer portion upon determination that the target address matches the address tag. The target address of the data update is pre-fetched from the memory location upon determination that the target address does not match the address tag. The first and second buffer portions buffer the data update using the pre-fetched target address.

Abstract: A fan arrangement includes a fan and toothed ring, and a converter motor includes a fan arrangement. The fan includes a base body on which fan blades are premolded, and the fan includes an annular region, which is premolded on the side of the fan blades facing away from the base body. The toothed ring is situated within the annular region, and thus, in particular, is set apart from the base body, and thus, in particular, is set apart from the base body via the fan blades.