Open-loop clutch-to-clutch upshift control having clutch overlap

Details Open-loop clutch-to-clutch upshift control having clutch overlap Open-loop clutch-to-clutch upshift control having clutch overlap

1991-06-27

1992-06-09

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, B60K 4118

Patent

active

051196956

ABSTRACT:
An open-loop clutch-to-clutch shift control system wherein the overlap between off-going and on-coming clutches in an upshift is regulated in accordance with a confidence term determined through a self-estimation by the control system of its ability to accurately determine the on-coming clutch fill time, and thus, its ability to effect a precise exchange of the off-going and on-coming clutches with little or no overlap. Under certain conditions, the confidence level is assumed to be low, and the clutches are controlled to result in a relatively high level of overlap. As the level of confidence improves, the timing of the clutch exchange is adjusted to reduce the level of overlap. When the level of confidence is high, the exchange of clutches is effected with almost no overlap.

REFERENCES:
patent: 4044634 (1977-08-01), Florus et al.
patent: 4796490 (1989-01-01), Butts et al.
patent: 4807497 (1989-02-01), Yasue et al.
patent: 5046174 (1991-09-01), Lentz et al.
patent: 5046383 (1991-09-01), Botts et al.
patent: 5070746 (1991-12-01), Milunas et al.
patent: 5070747 (1991-12-01), Lentz et al.

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