Slip control apparatus for motor vehicle lock-up clutch

Details Slip control apparatus for motor vehicle lock-up clutch Slip control apparatus for motor vehicle lock-up clutch

1996-12-10

1997-10-21

Lorence, Richard M.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

477 65, 477169, 477176, F16H 6114

Patent

active

056786670

ABSTRACT:
An apparatus including a slip control device for controlling an amount of slip of a lock-up clutch disposed between pump and turbine impellers in a power transmission system of a motor vehicle, a slip-parameter monitoring device for detecting the actual slip speed of the lock-up clutch or a control error between actual and target slip speeds of the lock-up clutch, a summing device for obtaining a sum of values of the actual slip speed or control error detected by the slip-parameter monitoring device for a predetermined period of time, and a defect detecting device for determining the presence or absence of a defect in slip control of the lock-up clutch by the slip control device, on the basis of the sum as compared with a predetermined reference. The slip-parameter monitoring device and summing device may be respectively replaced by a speed-parameter monitoring device for detecting a speed-related parameter which varies due to hunting in slip control of the lock-up clutch by the slip control device, and a smoothing device for smoothing the speed-related parameter. In this case, the hunting detecting device determines the presence or absence of the hunting defect on the basis of a difference of the speed-related parameter from its smoothed value.

REFERENCES:
patent: 4468988 (1984-09-01), Hiramatsu
patent: 4582185 (1986-04-01), Grimes et al.
patent: 4940122 (1990-07-01), Fujieda
patent: 4947734 (1990-08-01), Fujita et al.
patent: 4953677 (1990-09-01), Aoki et al.
patent: 5105926 (1992-04-01), Yoshimura et al.
patent: 5527233 (1996-06-01), Tabata et al.

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