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Torque converter clutch solenoid functional test

  • US 5,835,876 A
  • Filed: 08/20/1996
  • Issued: 11/10/1998
  • Est. Priority Date: 08/20/1996
  • Status: Expired due to Term
First Claim
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1. For use with a vehicle having an electronic control unit and a driveline system including an engine, a transmission, a torque converter operating to transfer engine torque to the transmission, a torque converter clutch having an applied state, and a solenoid to change the commanded apply state of the clutch, a method for testing the functionality of the solenoid comprising:

  • establishing a first torque converter speed ratio;

    determining a commanded apply state of the torque converter clutch;

    calculating a second torque converter speed ratio using engine speed and output shaft speed; and

    determining whether the torque converter clutch solenoid has changed the applied state of the torque converter clutch by performing a first comparison of the first and second torque converter speed ratios.

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