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Method and apparatus for determining faults in an electric assist steering system

  • US 7,483,796 B2
  • Filed: 12/08/2004
  • Issued: 01/27/2009
  • Est. Priority Date: 12/08/2004
  • Status: Active Grant
First Claim
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1. A method for determining a fault in a system including an electric motor, said method comprising the steps of:

  • determining a calculated star voltage of the electric motor comprising the steps of;

    determining phase voltages to apply to the phases of the electric motor; and

    determining the sum of said phase voltages, said calculated star voltage being equal to one-third of said sum of said phase voltages;

    determining a measured star voltage of the electric motor;

    comparing said calculated star voltage to said measured star voltage of the electric motor to determine a star voltage error; and

    determining the fault in the system when said star voltage error exceeds a predetermined maximum star voltage error.

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