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US 9,752,678 B2Granted
Variator control with torque protection
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.
Claims11
An electro-hydraulic controller for a multi-mode transmission including a variator having an output, the electro-hydraulic controller comprising
- a control circuit including a plurality of speed sensors, wherein each speed sensor is configured to produce a signal indicative of a speed of a corresponding component of the transmission,
- a processor operatively coupled to the control circuit,
- a memory device operatively coupled to the processor, the memory device including instructions that, when executed by the processor, cause the electro-hydraulic controller to (i) monitor the signals produced by the speed sensors, (ii) determine a torque applied to the output of the variator based on the signals produced by the speed sensors, and (iii) control a pressure of hydraulic fluid supplied to the variator to respond to the torque applied to the output of the variator.
Dependencies are inferred from the claim text.