Method for diagnosing a torque converter's lock-up mechanism

Details Method for diagnosing a torque converter's lock-up mechanism Method for diagnosing a torque converter's lock-up mechanism

1995-04-17

1997-03-11

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Clutch control

477175, 477906, B60K 4102

Patent

active

056095503

ABSTRACT:
A method of diagnosing a lock-up mechanism for a torque converter in an automatic transmission of an automotive vehicle includes the steps of sensing vehicle speed and engine speed, calculating a vehicle speed to engine speed ratio based on the sensed vehicle speed and engine speed, knowing when the torque converter transitions between unlock and lock are initiated, determining whether the calculated ratio is greater than a predetermined threshold when the torque converter transitions between unlock and lock, and concluding that a failure of the lock-up mechanism has occurred if the calculated ratio is not greater than the predetermined threshold within a predetermined time since transition of the torque converter.

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patent: 5366424 (1994-11-01), Wataya
patent: 5416665 (1995-05-01), Nishiwaki et al.
patent: 5489012 (1996-02-01), Buckley et al.
patent: 5527238 (1996-06-01), Hrovat et al.

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