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Power Supply For By-Wire System

  • US 20100201191A1
  • Filed: 02/11/2009
  • Published: 08/12/2010
  • Est. Priority Date: 02/11/2009
  • Status: Abandoned Application
First Claim
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1. A vehicle electric power supply system comprising:

  • a battery having a first terminal connected to ground and a second terminal;

    a key operated switch;

    a first electronic control unit (ECU);

    a second ECU;

    a battery line connected to the second terminal of the battery, connected to the second ECU, and connected to the key switch;

    an alternator having a first terminal connected to ground and a second terminal,an alternator line connecting to the second terminal of the alternator to the first ECU and to the key switch; and

    a main relay comprising a relay switch having a first contact connected to the battery line, a second contact connected to the alternator line, a switch element movable from a first position connecting the first contact to the second contact to a second position isolating the first contact from the second contact, and a relay coil which is energizable to move the switch element into its second position, energization of the relay coil being controlled by one of the ECUs, said one ECU causing the relay coil to move the switch element to its second position so that the second terminal of the alternator and battery are isolated from each other so that voltage from the alternator and battery can be independently tested.

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