Method and apparatus for diagnosing a fault in a lock-up mechani

Details Method and apparatus for diagnosing a fault in a lock-up mechani Method and apparatus for diagnosing a fault in a lock-up mechani

1995-02-08

1997-02-04

Luong, Vinh T.

Interrelated power delivery controls, including engine control

Clutch control

Condition responsive control

192 33, 192 331, F16D 3300, B60K 4102, F16H 6114

Patent

active

055992544

ABSTRACT:
A slip condition of a torque converter is learned at a predetermined operating condition with a lock-up mechanism disengaged, and a diagnosis condition (for example a start time or judgement level of the fault diagnosis) used in diagnosing a fault in the lock-up mechanism on the basis of slip conditions of the torque converter which change after issue of a disengage command to the lock-up mechanism, is corrected in accordance with the learned result. As a result, the diagnosis condition which is conventionally set assuming a maximum viscosity for the operating fluid, can be changed to correspond to the actual viscosity of the operating fluid being used. Hence, the time delay from issue of a disengage command to the lock-up mechanism until starting fault diagnosis can be reduced, so that it is possible to diagnose if normal lock-up mechanism disengagement is being made at a response speed which follows the demands for rapid lock-up mechanism disengagement under operating conditions including acceleration and deceleration operating conditions such as encountered with city driving and the like.

REFERENCES:
patent: 4700819 (1987-10-01), Nishikawa et al.
patent: 4724939 (1988-02-01), Lockhart et al.
patent: 4953677 (1990-09-01), Aoki et al.
patent: 5121820 (1992-06-01), Brown et al.
patent: 5160002 (1992-11-01), Suzuki
patent: 5190128 (1993-03-01), Iizuka
patent: 5332073 (1994-07-01), Iizuka

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