Touch point identification algorithm for automatic clutch contro

Details Touch point identification algorithm for automatic clutch contro Touch point identification algorithm for automatic clutch contro

1993-07-19

1995-02-28

Lorence, Richard M.

Interrelated power delivery controls, including engine control

Transmission control

With clutch control

192111A, B60K 4128, F16D 1375

Patent

active

053932749

ABSTRACT:
This invention provides automatic and reliable determination of the touch point of a clutch controlled by an automatic clutch actuation controller. This invention determines the touch point upon power-up while idling the engine, with the transmission in neutral and an input shaft brake applied. The clutch actuation controller gradually engages the clutch so that the measured transmission input speed matches a reference speed signal preferably between 40 and 60% of the idle speed. If the actuation is slow enough, this reliably provides the degree of clutch engagement at a small torque matching the braking torque which is the touch point. If there is no previous knowledge of the touch point, the clutch is applied at a fast rate and an approximate touch point is determined, then the clutch is positioned below the approximate touch point and is again applied at a slow rate to more accurately ascertain the touch point. If there is previous knowledge of the touch point, the clutch is positioned just below the old touch point and is applied at a slow rate to determine a new touch point. The new and old touch points may be combined to determine the updated touch point.

REFERENCES:
patent: 4629045 (1986-12-01), Kasai et al.
patent: 4646891 (1987-03-01), Braun
patent: 4899858 (1990-02-01), Cote et al.
patent: 5029678 (1991-07-01), Koshizawa
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patent: 5065851 (1991-11-01), Otsuka et al.
patent: 5314050 (1994-05-01), Slicker et al.
patent: 5337868 (1994-08-01), Liu et al.
patent: 5337874 (1994-08-01), Oltean et al.

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