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US 2015/0247572 A1Published application
Multi-plexing clutch logic control of a multi-mode transmission
AssigneeAllison Transmission, Inc.
InventorsCharles F. Long, Darren J. Weber, John William Edward Fuller, Stephen Murray
Life of this patent
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Abstract
A transmission includes an electro-hydraulic controller that includes redundancy in the hydraulic circuit that permits single fault failures to be compensated for by changing the flow path of hydraulic fluid to bypass the single fault failure. The redundancy results in the ability of the transmission to maintain full operation in all modes.
Claims20
A an electro-hydraulic controller for a transmission, the electro-hydraulic controller comprising
- a plurality of hydraulically actuated clutches,
- a mode logic section for controlling the flow path of hydraulic fluid to the hydraulically actuated clutches to control a ratio of the transmission, and
- a mode trim section for controlling the pressure applied to clutches, the mode trim section cooperating with the mode logic section to vary the pressure applied to each of the plurality of hydraulically actuated clutches to vary the operating mode of the transmission.
Dependencies are inferred from the claim text.