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
  • 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
  • H02J7/1423—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 with multiple batteries
• • 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
  • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
  • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
  • H02J2310/46—The network being an on-board power network, i.e. within a vehicle for ICE-powered road vehicles
• • 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 motor vehicles and, more particularly in such vehicles, a device for supplying the electrical network when the latter comprises a high power electrical charge.
• a motor vehicle electrical network is powered by a battery which is recharged by an alternator driven by the vehicle engine.
• the battery is more or less stressed depending on the operating state of the vehicle. This stress is very high at the start when the start consumes a lot of electrical power but it is low during a long journey in the absence of the start-up, for example, comfort loads such as ventilation of the cabin, heated rear window, defrosting windshield.
• a third solution (German patent No. 4 326 384) consists in implementing a system composed of two batteries, coupled in series or in parallel, and of a device with five relays with a single working contact. Such a system is expensive due to the use of five relays; in addition, one of the common failures of these relays is to remain stuck on the working contact, which can cause a short circuit at the terminals of one of the two batteries if this sticking is not detected.
• the object of the invention is therefore to provide a device for supplying an electrical network of a motor vehicle comprising a high power electrical charge which does not have the drawbacks of the devices of the prior art described succinctly above.
• This object is achieved by using two batteries which are coupled together and to the electrical network by means of two relays controlled by an electronic control device.
• the invention relates to a device for supplying an electrical network of a motor vehicle comprising a high power load, such as an electrical resistance for heating an element to be heated, said electrical network being supplied by a first battery, characterized in that it comprises: - a second battery,
• a first relay for connecting the positive terminal of the second battery either to the positive terminal of the first battery, or to one of the terminals of the electrical heating resistor, the other terminal of which is connected to ground,
• a second relay for connecting the negative terminal of the second battery either to earth or to the positive terminal of the first battery
• the invention also relates to a method for implementing the supply device, characterized in that it comprises the following steps consisting in: (C1) putting the first and second relays in a first position at a standstill so that the two batteries are connected in parallel,
• (C3) put the second relay in the first position when the ignition key is in the start position so that only the second battery supplies the electrical heating resistance while the first battery supplies the electrical network as long as the voltage across the terminals of the electrical network is not less than a second threshold and that the engine has not started.
• a first battery B1 supplying for example a voltage of 12 volts, permanently supplies an electrical network 10 of the motor vehicle, this network comprises in parallel: - an alternator 12,
• a second battery B2 supplying for example a voltage of 12 volts, supplies an electrical heating resistance 18 of a catalytic converter (not shown) via a first relay REl with two positions (a) and (b), the movable contact 20 is connected to the positive terminal of the second battery B2.
• the negative terminal of the battery B2 is connected to the movable contact 22 of a second relay RE2 with two positions (a) and (b), the terminal of the position (a) being connected to ground while the terminal of the position (b) is connected to the positive terminal of the first battery Bl.
• the terminal corresponding to the position (2_>) is connected to a terminal of the electrical heating resistor 18 while the terminal corresponding to the position (a) is connected to the positive terminal of the battery Bl.
• the other terminal of the electrical heating resistor is connected to ground.
• the relays RE1 and RE2 are controlled by electrical signals supplied by an electronic control circuit 24 according to a certain number of parameters which are:
• this information possibly being either the pressure in the exhaust manifold, or the temperature of the catalytic converter, or the temperature of the electrical resistance of the heating of the catalytic converter, and
• the information relating to the heating of the catalytic converter will be the temperature of the catalytic converter itself, but the invention can be implemented using one of the parameters indicated above, these parameters being representative of- the temperature of the catalytic converter.
• the temperature information of the element to be heated is for example compared with temperature thresholds T1 and T2.
• the first threshold Tl being that below which it is necessary to heat the element and the second threshold T2 being that above which it is not necessary to heat the element.
• the electrical control circuit 24 provides an electrical ignition control signal a warning lamp (not shown) indicating to the driver that the heating phase of the catalytic converter is in progress.
• the invention proposes three safety devices which are:
• a diode 28 the anode of which is connected to the positive terminal of the battery Bl and the cathode of which is connected to the terminal of the position (a) of the relay REl so that a short circuit will never be possible
• an additional circuit in the electronic control circuit 24 so as to detect an abnormal position of the relays, such as the bonding of the relays on one of the terminals, from the voltage information at the terminals of the electrical heating resistance 18 of the pot catalytic (connection 30) and on the negative terminal of the battery B2 (connection 32).
• the relays RE1 and RE2 are in position (a) so that the batteries Bl and B2 are coupled in parallel on the electrical network 10: the electrical heating resistance 18 of the catalytic converter is not supplied.
• Vcl ll volts.
• the batteries Bl and B2 are in series and supply the electrical heating resistor 18 with a voltage of 24 volts. This 24 volt supply lasts a few tens of seconds thanks to a timing circuit.
• the relay RE2 switches to position (a) and the relay REl remains in position (b): the electrical heating resistor 18 is supplied by the battery B2, which makes it possible to continue heating the catalytic converter under a reduced power during the start-up phase.
• the relays REl and RE2 pass to position (a) so that the batteries Bl and B2 are connected in parallel on the electrical network and contribute to the supply of the starter.
• the relays REl and RE2 can be in the following three states:
• Relays REl and RE2 are in position (b) as long as the voltage across the electrical network is greater than Vcl and the duration of the time delay has not elapsed; (2) The relays REl and RE2 are in position (a) if the heating of the catalytic converter is finished or if the voltage of the electrical network is lower than Vc2;
• the relay RE2 will always remain in position (a) so that the batteries Bl and B2 will be connected in parallel, - if the relay REl remains stuck in position (b), the relay RE2 will always remain in position (a) so that the electrical heating resistance (18) will be supplied by the battery B2,
• the relay REl will always remain in position (b) so that the electrical heating resistor 18 will be supplied by the two batteries Bl and B2 in series.
• the invention has been described in its application to the heating of a catalytic converter but it can be applied to other elements of the electrical network such as electrical resistances for heating the air in the passenger compartment of the vehicle or the engine cooling water.
• the electrical control circuit 24 has been shown as a separate element but it can be integrated into the injection computer of the motor vehicle, in which case this information necessary for the implementation of the invention is known to the computer d injection for its own needs.
• the second battery B2 can be replaced by a supercapacitor.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Exhaust Gas After Treatment (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=9521760

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Family Cites Families (5)

• 1998
  • 1998-01-14 FR FR9800317A patent/FR2773526B1/fr not_active Expired - Fee Related
• 1999
  • 1999-01-13 WO PCT/FR1999/000050 patent/WO1999036291A1/fr not_active Application Discontinuation
  • 1999-01-13 EP EP99901622A patent/EP1047578A1/de not_active Withdrawn

Non-Patent Citations (1)

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