Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
  • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
  • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
  • H02J7/1438—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle in combination with power supplies for loads other than batteries
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
  • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
  • H02J1/14—Balancing the load in a network
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/60—Other road transportation technologies with climate change mitigation effect
  • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

• the invention relates to a method for managing electrical energy in an electrical network, in particular a motor vehicle electrical system, according to the preamble of patent claim 1, and a device for power management according to the preamble of patent claim 6.
• Known energy management systems usually include a control unit with an algorithm that constantly monitors the energetic state of the electrical system. If the grid voltage falls below a predetermined threshold, consumption-reducing measures are initiated to relieve the on-board network. These include e.g. switching off or dimming
• Comfort consumers such as a seat heating or ventilation. This is to prevent the mains voltage from falling below a minimum voltage required for the functioning of safety-relevant devices.
• a disadvantage of known systems is that the intervention in the vehicle electrical system takes place only when the condition of the vehicle electrical system has already become critical. The system reacts only to an already existing error condition. Disclosure of the invention
• An essential idea of the invention is to monitor the occurrence of certain operating states or processes in the electrical system - regardless of whether the vehicle electrical system voltage has reached a critical value or not - and to reduce the power consumption of at least one consumer, if such an operating state detected has been. In operating conditions where extra energy for a particular
• the switching off or dimming of consumers is preferably already initiated at the moment in which another consumer is switched on or increased in its performance.
• the electrical system is monitored by an algorithm, which is preferably stored in the engine control unit.
• the algorithm evaluates information about the current or future power requirement of the consumers connected to the electrical system.
• information about an (imminent) change in the operating state of the vehicle is taken into account.
• the controller receives the corresponding information either directly from the consumers connected to it or z. B. from another controller.
• control electronics monitor the occurrence of one or more of the following Operating conditions, namely the collapse of a supply voltage, a boost operation, a recuperation, the pre-charging a high-voltage energy storage (in a hybrid vehicle) and / or a purely electric driving operation (hybrid vehicles).
• the consumers controlled in the context of energy management may in particular be one or more of the following consumers, namely an electric heater, an electric air conditioning compressor, an electric motor fan, a DC / DC converter and / or an electric power steering pump.
• the individual electrical consumers may have different priority, i. in certain situations, certain consumers may be regulated earlier than others.
• the priority of the individual consumers can also change depending on the operating state.
• the control unit monitors the vehicle electrical system voltage with respect to falling below a predetermined minimum voltage or the battery with respect to falling below a certain state of charge (SOC). If a voltage dip, the vehicle electrical system voltage with respect to falling below a predetermined minimum voltage or the battery with respect to falling below a certain state of charge (SOC). If a voltage dip, the vehicle electrical system voltage with respect to falling below a predetermined minimum voltage or the battery with respect to falling below a certain state of charge (SOC). If a voltage dip, the SOC.
• the controller reduces the performance of one or more consumers.
• the electrical consumers can be switched off or dimmed in predefined order or dependency.
• the control unit monitors the driving state for the occurrence of a boost operation (hybrid vehicle) in which the electric machine is connected to accelerate the vehicle quickly.
• a boost operation hybrid vehicle
• predefined electrical loads can be selectively switched off or dimmed, thus achieving a short-term performance coverage for the electric machine.
• it can be decided individually which electrical load is turned off first and which later. This measure preferably takes place centrally in the energy coordinator.
• the driving state is monitored for the occurrence of a recuperation operation, in which the battery by means of Vehicle generator is charged.
• a recuperation operation Upon detection of a recuperation operation, one or more electrical loads may also be selectively shut down or reduced in power to speed up battery charging. If too much energy is generated during recuperation, the energy consumption of the consumers can also be increased.
• the driving state of the vehicle is monitored with respect to a pre-charge operation of the energy storage device (in hybrid vehicles). Once a precharge operation has been detected, in turn, pre-defined electrical loads can be shut down to ensure the safe startup of the high-voltage system. Since precharging usually high current or voltage spikes may occur, certain electrical loads are preferably decoupled from the network to protect them.
• the energy coordinator is preferably set up so that it can control the nominal power of an electrical load and / or the time duration of the power consumption of each electrical load.
• An apparatus for managing electrical energy in an electrical network essentially comprises a control unit, such as e.g. the engine control unit, in which a corresponding energy management algorithm (energy coordinator) is stored.
• the control unit has at least one input for the signals of a sensor system for monitoring various operating states of the vehicle or at least one data input via which it can query various relevant information regarding the current or a future power requirement.
• the control unit also has a plurality of outputs, via which various consumers connected thereto can be controlled.
• the energy management algorithm contained in the control unit is programmed such that one or more method steps of the method described above can be carried out.
• FIG. 1 is a schematic block diagram of a system for managing electrical energy in a vehicle
• Fig. 2 is a schematic block diagram of the essential modules of an energy coordinator.
• Fig. 1 shows a schematic block diagram of an energy management system with a power coordinator 1, which is stored in a control unit 9 as software.
• the energy coordinator 1 essentially serves to redistribute the available energy in the electrical network as needed and to make certain processes available.
• control unit 9 monitors the operating state of the vehicle in relation to the occurrence of certain operating states and constantly analyzes the power available in the electrical system (eg, by means of a voltage measurement or measurement of the state of charge of the battery).
• control unit 9 is connected to a corresponding sensor 3 or a further control unit which provides the corresponding information.
• the control unit 9 is further connected to a plurality of electrical consumers 4-8 and, in the case of a hybrid vehicle, to an electric machine 2 of the vehicle.
• the energy coordinator 1 can turn off one or more of the consumers 4-8 or reduce in their performance, so that this power is free and available for the process in question.
• the consumers 4-8 and the electric machine 2 are controlled accordingly by the control unit 9.
• the energy coordinator 1 is preferably stored in the engine control unit.
• the electrical consumers 4-8 may be, for example, an electric heater 4, an electric air conditioning compressor 5, an electric engine fan 6, an electric power steering pump 7, a DC / DC converter 8 or any other electrical consumer.
• the various consumers 4-8 can be controlled in a predetermined sequence or according to predetermined priorities.
• the mode of operation of the energy coordinator 1 will be better understood on the basis of the examples described below:
• the electric machine 2 is switched on, which assists the internal combustion engine during acceleration. This process is also referred to as a boost operation.
• one or more of the electrical consumers 4-8 can be selectively switched off or temporarily reduced in their power.
• the electric machine 2 In a hybrid vehicle, the electric machine 2 is used in certain driving situations as a generator to charge the battery of the vehicle. This is also called recuperation operation. To the
• the energy coordinator 1 can optionally or additionally also monitor the vehicle electrical system voltage with respect to the undershooting of a predetermined minimum voltage, or the state of charge (SOC) of the battery. As soon as the vehicle electrical system voltage drops below the minimum voltage, various electrical consumers 4-8 can be switched off or in your own
• Power consumption can be reduced.
• the switching off or reducing the power can again be done in predefined order according to a given prioritization.
• the energy coordinator may also monitor the operating condition of the vehicle with respect to a pre-charge operation of the energy store (in hybrid vehicles). Once a precharge operation has been detected, predefined electrical loads 4-8 can again be switched off to ensure the safe start of the high-voltage system.
• Fig. 2 shows a schematic block diagram of the essential software modules of a power coordinator 1.
• the reference numeral 10 denotes a battery voltage intrusion, 11 a precharge operation in which the energy storage of a hybrid vehicle is precharged, 12 a boost operation, 13 a recuperation and 14 a driving operation in which a hybrid vehicle drives purely electric.
• reference numeral 15 designates the control module for the engine fan 6, 16, the control module for the electric heater 4, 17, the control module for the air compressor 5, 18, the control module for the power steering pump 7 and 19, the control module for a DC / DC converter.
• the control modules 15-19 each receive at their inputs a status signal which signals the presence of one of the above-described states 10-14. Depending on the nature of the current operating state 10-14, the individual modules 15-19 generate at their outputs in each case a specific control signal for the individual consumers 4-8. In this case, one or more of the consumers 4-8 can be switched depending on the design of the system.

Applications Claiming Priority (2)

Publications (1)

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Cited By (4)

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Citations (4)

• 2006
  • 2006-06-07 DE DE102006026404A patent/DE102006026404A1/de not_active Ceased
• 2007
  • 2007-04-10 WO PCT/EP2007/053445 patent/WO2007141069A1/de active Application Filing

Patent Citations (4)

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