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US 12,173,778 B2Granted
Continuously variable transmissions, synchronous shifting, twin countershafts and methods for control of same
Assigneeenviolo B.V.
InventorBrian Schoolcraft
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Abstract
Systems and methods for controlling transmissions having CVTs are disclosed with multiple modes and gearing arrangements for range enhancements, where embodiments include synchronous shifting to allow the transmission to achieve a continuous range of transmission ratios, while minimizing “empty” cycling of the CVT during mode shifts. Embodiments provide for wide ratio range and performance and efficiency flexibility, while maximizing CVT usage through synchronous shifting.
Claims11
A system for synchronous shifting, comprising:
- a first gear having a first clutch assembly, the first clutch assembly being configurable in any of a fully engaged state, a passively engaged state, a disengage pre-stage state and a fully disengaged state;
- a second gear having a second clutch assembly, the second clutch assembly being configurable in any of a fully engaged state, a passively engaged state, a disengage pre-stage state and a fully disengaged state;
- a controller configured to receive a signal associated with an operating parameter of the second clutch assembly, the operating parameter being associated with the second clutch assembly operating in the passively engaged state;
- a second clutch assembly actuator configured to shift the second clutch assembly to operate in the fully engaged state;
- and
- a first clutch assembly actuator configured to shift the first clutch assembly to the disengage pre-stage state, the first clutch assembly configured to operate in the fully disengaged state when torque applied to the first clutch assembly decreases below a threshold.
3 more elements
Dependencies are inferred from the claim text.