Redundant controls for a multi-mode transmission

摘要

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.

主权项

1. A transmission comprising
an input shaft, a variator operably coupled to the input shaft, the variator including an output, a rotation transfer assembly operably coupled to the output of the variator, the rotation transfer assembly including a plurality of mode control clutches, the mode control clutches selectively and independently engageable to vary a ratio of rotational motion transferred from the variator to an output of the rotation transfer assembly, an electro-hydraulic control system operable to vary the ratio transferred through the variator and the rotation transfer assembly, the electro-hydraulic control system including a variator control section and a mode control section, the variator control section and the mode control section arranged such that one of the variator control section or the mode control section provides a redundant control of the other of the variator control section or the mode control section when a single point failure is experienced by a component of the variator control section or the mode control section.