Closed-loop control of an infinitely variable transmission
AssigneeUniversity of Maryland, Baltimore County
InventorsWeidong ZHU, Xuefeng WANG, Gang LI
Life of this patent
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Abstract
A nonlinear closed-loop control combined with an integral time-delay feedback control is disclosed to adjust a speed ratio of an infinitely variable transmission (IVT) system. A speed ratio control for an IVT system involves a forward speed controller and a crank length controller for different speed ranges. The time-delay control is designed to reduce speed fluctuations of the output speed of an IVT with an accurate speed ratio. The speed ratio of an IVT with the disclosed control strategy can achieve an excellent tracking response for the desired constant output speed and reduce speed fluctuations of the output speed of an IVT by the time-delay feedback control.
Claims12
1-20. (canceled)
A method for control of an infinitely variable transmission is described, the method comprising:
- determining a desired output rotation speed of the infinitely variable transmission;
- and
- determining a control signal for a crank length control mechanism based on the determined output rotation speed;
- and
- at a crank length control mechanism:
- receiving the control signal;
- and
- controlling the crank length of the infinitely variable transmission based on the control signal.
A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a computing device to cause the computing device to:
- determine a desired output rotation speed of an infinitely variable transmission;
- and
- determine a control signal for a crank length control mechanism based on the determined output rotation speed;
- and
- generate an output representative of the control signal for input into the crank length control mechanism.
A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a computing device to cause the computing device to:
- determine a crank length for the infinitely variable transmission, a desired modulated input speed of an input-control module, and an output torque of an output shaft of the infinitely variable transmission, wherein the input-control module is configured to control a motion conversion module of an infinitely variable transmission;
- and
- output a control signal to the input-control module based on the determined crank length, the desired modulated input speed, and the output torque.
Dependencies are inferred from the claim text.