(19)
(11)EP 3 878 680 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
29.09.2021 Bulletin 2021/39

(43)Date of publication A2:
15.09.2021 Bulletin 2021/37

(21)Application number: 21275024.4

(22)Date of filing:  08.03.2021
(51)International Patent Classification (IPC): 
B60L 5/18(2006.01)
B60L 9/16(2006.01)
B61C 3/02(2006.01)
B60L 53/14(2019.01)
B60L 5/38(2006.01)
B60L 50/53(2019.01)
B60L 50/61(2019.01)
(52)Cooperative Patent Classification (CPC):
B60L 2200/26; B60L 5/18; B61C 3/02; B60L 53/14; B60L 50/61; B60L 50/53
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30)Priority: 13.03.2020 GB 202003677

(71)Applicant: HITACHI RAIL LIMITED
London Greater London EC4M 7AW (GB)

(72)Inventors:
  • DAUTEL, Christopher
    London, Greater London EC1N 2PB (GB)
  • AGATSUMA, Koji
    London, Greater London EC1N 2PB (GB)

(74)Representative: Mewburn Ellis LLP 
Aurora Building Counterslip
Bristol BS1 6BX
Bristol BS1 6BX (GB)

  


(54)DRIVE SYSTEM FOR A RAILWAY VEHICLE


(57) A drive system for a railway vehicle is provided. The drive system includes a first power supply sub-system for supplying power from an overhead line or live rail. The drive system further includes an inverter joined to the first power supply sub-system by a DC link, the inverter converting the DC power to three phase AC power. The drive system further includes an electric motor for providing traction torque to the vehicle and connected to the inverter by a three phase AC link such that the three phase AC power from the inverter drives the electric motor. The drive system further includes a rechargeable traction battery connected to the DC link for providing DC power to or removing DC power from the drive system at the DC link. The drive system further includes a second power supply sub-system for providing three phase AC power to the drive system at the three phase AC link, the second power supply sub-system including a contactor moveable between a deployed position at which the contactor can make an electrical connection to a power outlet of an external three phase AC power supply network, and a retracted position at which such an electrical connection is prevented. The drive system further includes a first switch on the three phase AC link, the first switch being configured such that a closed position of the first switch connects the electric motor to the three phase AC link to allow the three phase AC power from the inverter to drive the electric motor, and an open position of the first switch disconnects the electric motor from the three phase AC link to prevent the three phase AC power from the inverter and the three phase power from the second power supply sub-system from driving the electric motor. The drive system further includes a controller which controls operation of the drive system, the controller being configured to provide: (i) a first circuit configuration of the drive system in which the contactor is in its retracted position, the first switch is in its closed position, and the electric motor is driveable by power supplied by the first power supply sub-system and/or the traction battery, and (ii) a second circuit configuration of the drive system in which the contactor is in its deployed position for connection to the power outlet, the first switch is in its open position, and the traction battery is chargeable by three phase AC power supplied by the three phase AC power supply network and converted to DC power by the inverter.







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