Acceleration with virtual gear ratios from low speeds
AssigneeZF Friedrichshafen AG
InventorsSimon Geiger, Matthias Duller
Life of this patent
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Abstract
The invention relates to a method for accelerating a vehicle with a continuously variable transmission (1050) where a gear ratio of the transmission is at first larger than a gear ratio of a virtual fixed gear. While the vehicle is accelerating, the gear ratio of the transmission is increased to the gear ratio of the virtual fixed gear. The transmission is then operated with the gear ratio of the virtual fixed gear.
Claims6
A method for accelerating a vehicle with a continuously variable transmission, wherein a gear ratio of the transmission is at first different than a gear ratio of a virtual fixed gear, wherein the method comprises:
- specifying an input rotation speed as a guide magnitude for controlling the transmission;
- changing the gear ratio of the transmission, while the vehicle is accelerating, to the gear ratio of the virtual fixed gear, thereby increasing the input rotation speed of the transmission;
- increasing the guide magnitude, while the vehicle is accelerating, to an input rotation speed associated with a target speed and the gear ratio of the virtual fixed gear;
- determining a position of an accelerator pedal or lever by measurement;
- determining the target speed as a function of the position of the accelerator pedal or lever;
- extrapolating a final speed of the vehicle;
- determining, while the vehicle is accelerating, that the final speed is lower than the target speed;
- increasing the guide magnitude to an input rotation speed associated with the final speed and the gear ratio of the virtual fixed gear;
- and
- operating the transmission with the gear ratio of the virtual fixed gear.
A method for accelerating a vehicle with a continuously variable transmission, comprising:
- specifying an input rotation speed as a guide magnitude for controlling the transmission;
- checking whether a gear ratio of the transmission corresponds to a gear ratio of a virtual fixed gear or is larger than the gear ratio of the virtual fixed gear;
- determining that the gear ratio of the transmission is larger than the gear ratio of the virtual fixed gear;
- changing the gear ratio of the transmission, while the vehicle is accelerating, to the gear ratio of the virtual fixed gear;
- increasing the guide magnitude, while the vehicle is accelerating, to an input rotation speed associated with a target speed and the gear ratio of the virtual fixed gear;
- determining a target speed as a function of the position of the accelerator pedal or lever;
- extrapolating a final speed of the vehicle;
- determining, while the vehicle is accelerating, that the final speed is lower than the target speed;
- increasing the guide magnitude to an input rotation speed associated with the final speed and the gear ratio of the virtual fixed gear;
- and
- operating the transmission with the gear ratio of the virtual fixed gear.
Dependencies are inferred from the claim text.