Apparatus for controlling lock-up clutch in vehicle automatic tr

Details Apparatus for controlling lock-up clutch in vehicle automatic tr Apparatus for controlling lock-up clutch in vehicle automatic tr

1990-08-17

1992-03-10

Lall, Parshotam S.

Boots, shoes, and leggings

74866, B60K 4122, G06G 700

Patent

active

050954350

ABSTRACT:
An apparatus for controlling a lock-up clutch in a vehicle automatic transmission having a speed changing mechanism and a fluid coupling, wherein an engine is connected directly to the speed changing mechanism when the lock-up clutch is engaged. The apparatus includes a determining device for determining satisfaction degrees of at least one basic fuzzy set theory rule corresponding to the released and engaged positions of the clutch, based on a predetermined clutch control pattern, a first calculating device for calculating satisfaction degrees of fuzzy set control rules, corresponding to the two positions of the clutch, depending upon a detected vehicle running condition, a second calculating device for calculating overall satisfaction degrees for selecting the respective positions of the clutch, based on the calculated satisfaction degrees of the basic fuzzy set theory rule or rules and the calculated satisfaction degrees of the fuzzy set control rules, and a selector for selecting one of the two positions of the clutch, based on the calculated overall satisfaction degrees.

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