Continuously variable transmissions, synchronous shifting, twin countershafts and methods for control of same
AssigneeFallbrook Intellectual Property Company LLC
InventorBrian Schoolcraft
Life of this patent
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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.
Claims3
A method for synchronous shifting between a first gear having a first clutch assembly and a second gear having a second clutch assembly, wherein the first clutch assembly and the second clutch assembly are each configurable in any of a fully engaged state, a passively engaged state, a disengage pre-stage state and a fully disengaged state, the method comprising:
- receiving 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;
- commanding a second clutch assembly actuator to configure the second clutch assembly to operate in the fully engaged state;
- and
- commanding a first clutch assembly actuator to configure the first clutch assembly in the disengage pre-stage state, wherein when torque applied to the first clutch assembly decreases below a threshold, the first clutch assembly operates in the fully disengaged state.
Dependencies are inferred from the claim text.