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.
Claims20
An infinitely variable transmission control system comprising:
- a crank length controller comprising electronic components configured to:
- determine a desired output rotation speed of an infinitely variable transmission (IVT);
- and
- determine a control signal for a crank length control mechanism based on the determined output rotation speed;
- and
- a crank length control mechanism configured to receive the control signal and control the crank length of the infinitely variable transmission based on the control signal,
- wherein the crank length controller is configured to:
- determine an estimated output rotation speed of the infinitely variable transmission;
- and
- determine the control signal for the crank length control mechanism based on the estimated output rotation speed.
An infinitely variable transmission control system comprising:
- an input-control module configured to control a motion conversion module of an infinitely variable transmission (IVT);
- and
- a forward speed controller comprising electronic components configured to:
- determine a crank length for the infinitely variable transmission, a desired modulated input speed of the input-control module, and an output torque of an output shaft of the 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.
A method for control of an infinitely variable transmission, the method comprising:
- determining 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
- outputting a control signal to the input-control module based on the determined crank length, the desired modulated input speed, and the output torque.
An infinitely variable transmission control system comprising:
- a crank length controller comprising electronic components configured 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
- a crank length control mechanism configured to receive the control signal and control the crank length of the infinitely variable transmission based on the control signal,
- wherein the crank length controller is configured to change the control signal for adjusting the crank length based on an estimate of the output rotation speed of the infinitely variable transmission.
Dependencies are inferred from the claim text.