초록 ▼

A method and system for testing the functionality of a solenoid used to change the apply state of a torque converter clutch in a vehicle having an electronic control unit and a driveline system including an engine, a transmission, a torque converter. A first torque converter speed ratio is establish

A method and system for testing the functionality of a solenoid used to change the apply state of a torque converter clutch in a vehicle having an electronic control unit and a driveline system including an engine, a transmission, a torque converter. A first torque converter speed ratio is established. The commanded apply state of the torque converter clutch is determined, then a second torque converter speed ratio is calculated using engine speed and output shaft speed. The functionality of the torque converter clutch solenoid is established by determining whether the torque converter clutch solenoid has changed the applied state of the torque converter clutch by performing a comparison of the first and second torque converter speed ratios.

대표청구항 ▼

[ I claim:] [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

[ I claim:] [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; anddetermining 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.