Ratio control method for a continuously variable transmission
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Abstract
A method for adjusting a ratio of a continuously variable automatic transmission where a nominal ratio is determined according to an accelerator pedal signal value. The nominal ratio is determined according to a modified accelerator pedal signal. When the periodic curve of the accelerator pedal signal has a relative extreme value to the modified accelerator pedal signal, a starting value is assigned which is equal to this extreme value. Until the value of the modified accelerator pedal signal is again equal to the value of the unmodified accelerator pedal signal, the value of the modified accelerator pedal signal is determined by a transfer function.
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Citations
12 Claims
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1-6. -6. (canceled)
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7. A method of controlling a variator ratio for a continuously variable automatic transmission at any point across an entire range of the variator ratio, the method comprising the steps of:
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determining a movement of an accelerator pedal;
feeding to an electronic transmission control an accelerator pedal signal corresponding to the movement of the accelerator pedal;
determining a modified accelerator pedal signal from the accelerator pedal signal in the electronic transmission control;
adjusting the variator ratio according to the modified accelerator pedal signal by the steps of;
testing whether a periodic curve of the accelerator pedal signal has a change in slope;
maintaining the modified accelerator pedal signal at a value equal to the unmodified accelerator pedal signal where a change in slope is not detected, and detecting a change in slope of the periodic curve and assigning a starting value (f_start1) to the modified accelerator pedal signal where the change in slope is detected, and determining the modified accelerator pedal signal according to a transfer function until the value of the modified accelerator pedal signal is again the same as the value of the unmodified accelerator pedal signal. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification