Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
  • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
  • B60R21/017—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including arrangements for providing electric power to safety arrangements or their actuating means, e.g. to pyrotechnic fuses or electro-mechanic valves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
  • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
  • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
• • 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
  • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
  • H02J7/00038—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange using passive battery identification means, e.g. resistors or capacitors
  • H02J7/00041—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange using passive battery identification means, e.g. resistors or capacitors in response to measured battery parameters, e.g. voltage, current or temperature profile
• • 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
  • H02J7/007—Regulation of charging or discharging current or voltage
  • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
• • 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
  • H02J7/007—Regulation of charging or discharging current or voltage
• • 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
  • H02J7/007—Regulation of charging or discharging current or voltage
  • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
  • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
• • 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
  • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
  • H02J7/04—Regulation of charging current or voltage
• • 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 is based on a method and a control unit according to the preamble of the independent claims.
• the subject of the present invention is also a computer program.
• Airbag systems as an example of personal protective equipment in vehicles store the energy necessary for activating restraint means in energy reserves or energy stores. Likewise, energy for maintaining the airbag system functionality in the event of supply interruption by crash impact is maintained and stored in advance in a personal protection energy storage.
• Voltage value is carried out and / or determining a supply current of a control unit or its change by specifying the charging current of the personal protective equipment energy storage and using the
• a vehicle may in the present case be understood to mean a motor vehicle such as, for example, a passenger car, a truck, a bus or the like.
• a personal protective equipment energy store can be understood to mean an energy store which is provided with energy, in particular electrical energy, directly for supplying a personal protection device, for example an airbag, a belt tensioner, a roll bar or the like.
• the passenger protection energy storage can be charged with energy from a source energy storage and in the event of a collision of the vehicle and / or a collapse of a
• Main energy storage of the vehicle in particular a vehicle battery, or be understood by a generator-buffered vehicle battery.
• Personal protective equipment can be brought into a ready-for-use condition very quickly if a charging current for charging the personal protective equipment
• Energy storage is determined in dependence on a (current) voltage value of the source energy storage and / or adjusted. This makes it possible to exploit the fact that the voltage value of the source energy store provides a conclusion about the current load of the source energy store and / or the state of charge of this source energy store, so that, depending on current load and / or charge state of this source energy storage of passenger protection energy storage can be charged with a higher or lower charging current. Likewise, the losses are in the
• Upconverter of the airbag control unit Supply current dependent. Knowing the supply voltage, the increasing output power of the boost converter can be used to increase the charge current of the personal protection storage as the voltage of the source energy storage increases, without overloading the boost converter. As a result, the personal protective equipment energy store no longer has to be charged with a predefined charging current that has already been set at the factory, which would be so low that, in the case of a high load as well as a lower charge state of the source energy storage device
• Personal protective equipment energy storage can still be charged within the desired commissioning time. Rather, by taking into account the voltage value of the source energy storage in the determination of the charging current for charging the personal protective equipment energy storage, the current actual load and / or the
• Personal protection for example, after a start of the vehicle.
• An advantage of embodiments of the invention presented here can be seen in particular in using the higher performance of a boost converter with increasing vehicle voltage for adaptive programming of the charge current regulator for charging the personal protective equipment energy storage as an energy reserve and thus to achieve significantly faster charging times, as well as load requirements of the source energy storage to take into account.
• an embodiment of the approach proposed here in which the steps of reading and the Ermitteins carried out at least once during a charging process of the personal protection means energy storage be executed repeatedly, in particular cyclically.
• Such an embodiment offers the advantage of being able to promptly take into account the current load situation of the source energy store, for example the vehicle (main) battery, and the boost converter, which in particular when the vehicle is started and the commissioning caused thereby
• Reading and the Ermitteins in such a designed time grid represents an optimal solution, on the one hand promptly to changes in the
• This lookup table may contain a
• step of determining the charging current with knowledge of a current power requirement of at least one electronic component of the vehicle can be determined. This can also be this knowledge have already been used in advance to determine a relationship between the voltage value of the source energy storage and the charging current in a look-up table.
• Source energy storage can be obtained when read in the step of reading the voltage value of a voltage divider, in particular wherein a value read in by the voltage divider is analog-to-digital converted.
• the voltage divider can optionally be equipped with a transistor arranged in series (high or low side). This interrupts the current flow in the idle state (SLEEP)
• the method may comprise a step of charging the personal protective equipment energy storage using the determined charging current, in particular wherein in the step of charging a programmable current-controlled transistor is used to set the charging current.
• a programmable current-controlled transistor is used to set the charging current.
• Source energy storage and the up-converter to make and to allow a rapid reduction of the load (different filter times in the direction of load increase and load reduction) on the one hand to minimize the load on the source energy storage / up-converter cause and on the other hand a quick charge of the
• the embodiments of the method presented here can be implemented, for example, in software or hardware or in a mixed form of software and hardware, for example in a control unit.
• the approach presented here also provides a control unit which is designed to implement the steps of a variant of a method presented here
• control unit can have at least one arithmetic unit for processing signals or data, at least one memory unit for storing signals or data, at least one interface to a sensor or an actuator for reading sensor signals from the sensor or for outputting control signals to the actuator and / or or at least one
• the arithmetic unit may be, for example, a signal processor, a microcontroller or the like, wherein the memory unit may be a flash memory, an EEPROM or a magnetic memory unit.
• the communication interface can be designed to read or output data wirelessly and / or by line, wherein a communication interface that can read or output line-bound data, for example, electrically or optically read this data from a corresponding data transmission line or output in a corresponding data transmission line.
• a control device can be understood as meaning an electrical device which processes sensor signals and outputs control and / or data signals in dependence thereon.
• the control unit may have an interface, which may be formed in hardware and / or software. In a hardware training, the interfaces, for example, part of a so-called system ASICs, the most diverse functions of the
• Control unit includes.
• the interfaces are their own integrated circuits or at least partially consist of discrete components.
• the interfaces may be software modules that are present, for example, on a microcontroller in addition to other software modules.
• control device is used to control a personal protection device, for example an airbag of a vehicle.
• control unit for example, to sensor signals such as
• Source energy storage access The activation takes place via actuators, such as, for example, a transistor-based adjustable (programmable) current regulator for charging the passenger protection energy storage device with a charging current signal representing the determined charging current.
• actuators such as, for example, a transistor-based adjustable (programmable) current regulator for charging the passenger protection energy storage device with a charging current signal representing the determined charging current.
• a computer program product or computer program with program code which can be stored on a machine-readable carrier or storage medium such as a semiconductor memory, a hard disk memory or an optical memory and for carrying out, implementing and / or controlling the steps of the method according to one of the above
• Fig. 1 is a block diagram of a device according to an embodiment
• FIG. 2 shows a schematic circuit diagram of an embodiment of the approach presented here as a control device
• FIG. 3 is a flowchart of a method according to a
• FIG. 1 shows a schematic representation of a vehicle 100 with a block diagram of a control device 102 for charging a personal protective equipment energy store 104 for operating a personal protection device 106 of the vehicle
• Vehicle protection means 106 may be, for example, an airbag which, in the event of a collision of vehicle 100 with an object not shown in FIG. 1, unfolds from steering wheel 108 in order to protect a vehicle occupant 110.
• a large number of further "airbags" which are likewise to be supplied with electrical energy, such as can be supplied, for example, from the personal protective equipment energy storage 104, are provided in a vehicle 100.
• the personal protective equipment energy storage 104 may, for example, be a capacitor which, when the vehicle 100 is put into operation, is charged with electrical energy from a source energy storage 112, for example the main vehicle battery.
• the control unit 102 can read in a voltage value 116 of the source energy storage 112 via an interface 114, which
• the control device 102 represents a current voltage of this source energy storage 112 and the vehicle (main) battery.
• the read voltage value can in a unit 118 of the control device 102 a
• Supply current (maximum input power) 120-1 are determined, from which a personal protection means energy storage 104 with (electrical) energy from the source energy storage 112 is to be charged. With the input 116,
• a suitable setting (programming) 122 with responsive filtering can be generated in the unit 118.
• the charging current regulator 124 With the adjustment signal 122, the charging current regulator 124 generates the optimum charge current (120) for the personal protective equipment energy store.
• this unit 124 for charging comprise a programmable current controlled transistor 124_1 which is driven (programmed) with the current signal 122_1.
• Personal protection energy storage 104 is formed. This loading time should be shortened if possible, without the cost of
• Airbag systems use energy storage, especially for the
• SBC System Basis Chip
• VZP battery voltage corresponding to voltage value 116 of the vehicle battery as source energy storage 112
• This voltage initially serves the self-supply of the SBC 200 and is the coil inductance L of the boost converter
• This boost converter 205 includes a current limited n-channel
• VUP control capacitor C Cathode the VUP control capacitor C is connected.
• the VUP voltage is supplied to the SBC for voltage regulation (PWM regulator PWM-R).
• PWM regulator PWM-R voltage regulation
• the duty cycle of the switching converter frequency is set in a suitable manner by the PWM controller PWM-R as a function of the detected current converter current (detected via Rsb) with the aid of an operational amplifier in the PWM controller PWM-R and / or by knowing the current VZP voltage.
• the enable logic 220 controls the converter operation in response to a variety of signals. For example, the enable logic 220 turns on or off
• the sleep mode also called the SLEEP function, in an airbag system is essentially controlled by suitable sleep transceivers 225 and the microcontroller ⁇ .
• Components of the SCB 200 are switched off so that their power consumption of VZP is kept below 30 ⁇ .
• the SLEEP input SL of the SBC 's 200 is directly linked to UB (ie, to the
• Boost Converter 205 that is, a step-up converter
• the vehicle voltage can be increased from 6V .... 16.5V to 25V ... 45V.
• the output of the converter 205 is a
• Personal protection energy storage 104 as energy reserve Elko
• the charging current level is over the
• Interface 122 predetermined by programming.
• the programming values are the unit 118 z. B. via a serial interface (SPI) available.
• SPI serial interface
• this charge current regulator 124 according to the following
• Personal protective equipment energy storage 104 determines. Furthermore, additional loads such as buck converter (step-down converter) to the buck converter (step-down converter).
• the Boost Converter 205 should be designed so that even in rare voltage situations down to 6 V, caused by weak / defective vehicle batteries 112, the supply of the
• the advantage of embodiments of the invention presented here is, in particular, the higher performance of the boost converter 205 with increasing vehicle voltage for adaptive programming of the
• Charge current controller 124 to charge the personal protective energy storage 104 as an energy reserve ER and thus to achieve significantly faster charging times for example, more than 98% of all power-on / wake-up phases, and load requirements of the source energy storage
• a given Boost Converter 205 of an airbag control unit is in terms of design and cost significantly by the input pin, the efficiency
• the at least available input power (pin-min) is given by the current limit of the boost converter 205, the minimum allowable input voltage Uboost_min at which the boost converter 205 is still active and the minimum duty cycle of the boost converter 205.
• lup_min [Uboost_min * lboost_min * Dboost_min * r
• lup_min IVlmax + IV2max + IVnmax
• IVlmax is the load current which is available to the charge regulator 124 of the energy reserve ER in the worst case (ie in the worst case)
• the charge current controller 124 / 124_1 can be programmed to IVl_max greater than or equal to 80 mA, without the boost voltage Vup breaking down.
• Charging times of the energy reserve ER or of the personal protective equipment energy store 104 of less than 3 s can be achieved in order to achieve an initialization required by the vehicle manufacturers after power on / wake up (readiness for a crash evaluation) within a time window of 4 s to allow.
• such includes
• Control unit 102 an energy reserve charging current regulator 124 / 124_1, as described above, an interface 122 for reading in the appropriate charge current programming value (determined in the energy reserve 104 charging speed compliance unit 118,
• the voltage 116 is supplied via the detection circuit 116_1 / 116_2 (voltage divider, ADC) to the iC, ⁇ with the unit 118 via an interface (SPI).
• This unit contains in addition to a suitable algorithm and / or use of scalable (via source parameters and / or Boost Converter parameter) mapping tables (charging current 116) to determine the SPI data 114 for programming the charging current 124 via the interface 122.
• the charging current controller 124 In addition to the analog / digital controller unit contains the control transistor Tch (P-channel MOS FET) with a current detection through the shunt Rsh.
• the energy reserve charging current 120 is adjusted by means of the (gate signal) current signal 122_1 to the value predetermined by programming or calculation by corresponding activation of the transistor Tch.
• the charging current regulator can be switched on by the ⁇ , ⁇ via the communication interface SPI to the charging current regulator interface 122.
• the charging current may be determined by relocating the unit 118 into the SBC 200.
• the current supply voltage 116 (whose value is designated by the designation UB) of the source energy store 112 (for example the main vehicle battery) is detected in the form of a divided voltage value 116_1 and by one in the SBC integrated analog-to-digital converter ADC digitized.
• the voltage VREF1 serves as a reference voltage for the analog-to-digital converter ADC.
• the microcontroller iC asks for the purpose of the adaptive charging of the energy reserve E R or of the personal protection means according to an exemplary embodiment.
• Energy storage 104 the current voltage values every 0.5 ms ... 10 ms from.
• the voltage divider 250 for detecting the battery voltage 116 or for supplying the voltage value U B contains, for example
• Converters 205 known in dependence on the current battery voltage 116 or UB. This allows the programming or setting of the charge current controller 124 / 124_1 to be adapted to the respective performance of the boost converter 205 in a 0.5 ms to 10 ms grid. As a result, much faster charging times of the energy reserve ER or the personal protective equipment
• Source energy storage 112 is omitted. Similarly, specifications for the permissible load of the source energy storage 112 as a function of the supply voltage (UB) 116 can be taken into account.
• V supplies a minimum battery voltage of 10.2 V.
• the microcontroller iC can calculate the charging current 120 orAbge_default_max programmed primarily for the worst case (wc case) in rapid succession (for example in a grid of 0, by calculating the charging current 120 or lcharge_adapt, respectively). 5 ms to 10 ms time slots) by default (ie
• Charge current regulator 124 / 124_1 by the unit 118 as a component of the SBC or as part of the ⁇ (SW function) in a fast 0.5ms to 10ms raster can be omitted or supplemented by using scalable (depending on Boost Converter hardware, and or permissible
• Source energy storage load stored tables, which as
• the microcontroller ⁇ for each measured UB_Airbag- voltage or to each measured voltage value UB assigns a correspondingly to be selected charging current 120 or Icharge_adapt value.
• the numerical load of the microcontroller ⁇ can be reduced and / or the table according to the detail capabilities of the boost converter circuit 205 (nboost is a complex size), the charge current controller 124 / 124_1, whose current step size of the charging currents to be programmed 120th etc. even better adapted or determined.
• FIG. 3 shows a flow chart of an embodiment of the present invention
• the Invention as a method 300 for charging a passenger protection energy storage device for operating a personal protection device of a vehicle.
• the method 300 includes a step 310 of reading a
• the method 300 includes a step 320 of determining a charging current for Charging the passenger protection energy storage with energy from the source energy storage, wherein the charging current is determined using the read voltage value and / or using the performance of the boost converter (minimal input power at minimum voltage UB, efficiency, the allowable load of the source memory, current depending on the voltage) and using the charging current for charging the passenger protection energy storage.
• method 300 includes a step 330 of charging the personal protective equipment energy storage using the determined charging current.
• an exemplary embodiment comprises an "and / or" link between a first feature and a second feature, then this is to be read so that the embodiment according to one embodiment, both the first feature and the second feature and according to another embodiment either only first feature or only the second feature.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Power Engineering (AREA)
• Charge And Discharge Circuits For Batteries Or The Like (AREA)
• Secondary Cells (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Families Citing this family (3)

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• 2017
  • 2017-10-18 DE DE102017218564.3A patent/DE102017218564A1/de active Pending
• 2018
  • 2018-10-04 US US16/753,224 patent/US11479197B2/en active Active
  • 2018-10-04 JP JP2020521890A patent/JP7174045B2/ja active Active
  • 2018-10-04 WO PCT/EP2018/076969 patent/WO2019076637A1/de unknown
  • 2018-10-04 CN CN201880067271.5A patent/CN111212765B/zh active Active
  • 2018-10-04 EP EP18785552.3A patent/EP3697647A1/de active Pending

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