Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1992-06-08
1994-03-01
Braun, Leslie A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
3644241, B60K 4106
Patent
active
052897419
ABSTRACT:
An improved adaptive line pressure control which detects the occurrence of run-through and overrides the normal adaptive pressure control in response to a detected run-through condition so that the line pressure during subsequent shifting is increased instead of decreased. A run-through condition is detected by periodically sampling the transmission speed ratio in the course of the inertia phase of an upshift from a lower speed ratio to an upper speed ratio, and determining the average ratio for the upshift. If the average ratio is within a reference amount of the normal value (ratio midpoint), the adaptive control is allowed to update the adaptive pressure value in relation to the difference between the measured shift time and a desired shift time. If the average ratio exceeds the normal value (midpoint) by more than the reference amount, a run-through is detected, and the adaptive pressure amount is increased regardless of the measured shift time.
REFERENCES:
patent: 4517646 (1985-05-01), Magnusson et al.
patent: 4981053 (1991-01-01), Yamaguchi
patent: 4982621 (1991-01-01), Sano
patent: 4998451 (1991-03-01), Sano
patent: 5115395 (1992-05-01), Petzold
patent: 5123302 (1992-06-01), Brown et al.
patent: 5163342 (1992-11-01), Pollack et al.
Debs William E.
Moses Robert L.
Braun Leslie A.
General Motors Corporation
Navarre Mark A.
Wittels Daniel
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