Motor vehicle lock-up clutch control apparatus, having means for

Details Motor vehicle lock-up clutch control apparatus, having means for Motor vehicle lock-up clutch control apparatus, having means for

1995-10-04

1997-04-15

Bonck, Rodney H.

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

192 331, 477169, F16H 4502, B60K 4128

Patent

active

056203900

ABSTRACT:
An apparatus for controlling a lock-up clutch between pump and turbine impellers in a power transmitting system of a motor vehicle, including a slip control device for controlling the amount of slip of the lock-up clutch, and a judder detector for detecting a judder of the lock-up clutch based on the number of detected speed variations of the turbine impeller during slip control of the lock-up clutch by the slip control device, wherein the judder detector is inhibited from using a variation of the turbine impeller speed variation for the detection of the judder, if the amount of change of the variation amplitude is larger than a predetermined threshold or if the period of the variation is outside a predetermined range. The judder detector is preferably arranged to operate on the basis of the variation amplitude of the turbine impeller speed as compared with the variation amplitude of the output speed of an automatic transmission multiplied by the actual speed ratio of the transmission, or on the basis of a phase difference between the variation waveforms of the turbine impeller and transmission output speeds.

REFERENCES:
patent: 4724939 (1988-02-01), Lochart et al.
patent: 5226513 (1993-07-01), Shibayama
patent: 5277287 (1994-01-01), Ishii et al.
patent: 5474506 (1995-12-01), Palansky et al.
Patent Abstracts of Japan, vol. 16, No. 553 (M-1339), Nov. 24, 1992, JP-A-04 210130, Jul. 31, 1992.

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