Method and apparatus to control a continuously variable transmission
AssigneeGM Global Technology Operations LLC
InventorPaul G. Otanez
Life of this patent
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Abstract
A method for controlling a variator of a continuously variable transmission includes combining, by a controller, a periodically repeating excitation signal and a desired variator speed ratio signal. A variator ratio derivative is determined based upon the desired variator speed ratio signal combined with the excitation signal. A variator control parameter is determined based upon the variator ratio derivative. The variator control parameter is sent to the controller for controlling the variator in response thereto.
Claims16
A method for controlling a variator of a continuously variable transmission, comprising:
- combining, by a controller, a periodically repeating excitation signal and a desired variator speed ratio signal;
- determining a variator ratio derivative based upon the desired variator speed ratio signal combined with the excitation signal;
- determining a variator control parameter based upon the variator ratio derivative;
- and
- sending the variator control parameter to the controller and controlling the variator in response thereto.
A method for controlling a variator of a continuously variable transmission, comprising:
- determining a command for controlling the variator in response to an operator torque request and a torque output from the continuously variable transmission;
- combining, by a controller, a periodically repeating excitation signal and the command for controlling the variator;
- determining a variator ratio derivative based upon the command for controlling the variator combined with the excitation signal;
- determining a control parameter for the variator based upon the variator ratio derivative;
- and
- sending the control parameter to the controller and controlling the variator in response thereto.
A method for controlling a variator of a continuously variable transmission, comprising:
- determining a command for controlling the variator in response to an operator torque request and a torque output from the continuously variable transmission;
- determining a presently measured actual variator speed ratio;
- determining a variator ratio derivative based upon the presently measured actual variator speed ratio;
- determining a control parameter for the variator based upon the variator ratio derivative;
- and
- sending the variator control parameter to the controller and controlling the variator in response thereto.
Dependencies are inferred from the claim text.