System and method of operating a machine having a continuously variable transmission
First Claim
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1. A machine comprising:
- a continuously variable transmission (CVT);
a machine speed sensor for determining a measured machine speed;
a virtual gear shifter enabling operator selection of a selected virtual gear ratio from among a plurality of virtual gear ratios associated with the CVT; and
a controller in communication with the CVT and the machine speed sensor, the controller including a reverse look-up table relating the measured machine speed to the plurality of virtual gear ratios associated with the CVT, the controller further configured to determine a calculated virtual gear ratio using the reverse look-up table and the measured machine speed and further to compare the calculated virtual gear ratio to the selected virtual gear ratio, anda visual display in communication with the controller for displaying the calculated virtual gear ratio and the selected virtual gear ratio and for comparison.
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Abstract
A system and method involves a machine that powertrain including a continuously variable transmission (CVT) and a machine speed sensor to determine a measured machine speed. The machine also includes a controller in communication with the CVT and the speed sensor. The controller may include a table relating the measured machine speed to a plurality of virtual gear ratios associated with the CVT. The controller is configured to determine a calculated virtual gear ratio using the table and, if desired, may display the calculated virtual gear ratio on a visual display.
38 Citations
13 Claims
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1. A machine comprising:
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a continuously variable transmission (CVT); a machine speed sensor for determining a measured machine speed; a virtual gear shifter enabling operator selection of a selected virtual gear ratio from among a plurality of virtual gear ratios associated with the CVT; and a controller in communication with the CVT and the machine speed sensor, the controller including a reverse look-up table relating the measured machine speed to the plurality of virtual gear ratios associated with the CVT, the controller further configured to determine a calculated virtual gear ratio using the reverse look-up table and the measured machine speed and further to compare the calculated virtual gear ratio to the selected virtual gear ratio, and a visual display in communication with the controller for displaying the calculated virtual gear ratio and the selected virtual gear ratio and for comparison. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of operating a machine having a power source operatively coupled to a continuously variable transmission (CVT), the method comprising:
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selecting a selected virtual gear ratio from a plurality of virtual gear ratios associated with the CVT; operating the machine in accordance with the selected virtual gear ratio; measuring a measured machine speed; comparing the measured machine speed to a plurality of virtual gear ratios in a reverse look-up table to determine a calculated virtual gear ratio, comparing the calculated virtual gear ratio to the selected virtual gear ratio to determine gear ratio accuracy, and displaying the calculated virtual gear ratio and the selected virtual gear ratio on a display screen for comparison. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A controller for controlling a machine including a continuously variable transmission (CVT), the controller comprising:
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a communication link to a machine speed sensor measuring a measured machine speed; data for a plurality of virtual gear ratios, each virtual gear ratio having an associated minimum virtual gear speed and an associated maximum virtual gear speed; a reverse lookup table correlating the measured machine speed to the plurality of virtual gear ratios to determine a calculated virtual gear ratio by referencing the maximum virtual gear speed, the controller further configured to compare the calculated virtual gear ratio to a selected virtual gear ratio to determine gear ratio accuracy, and to instruct a visual display linked to the controller to display the calculated virtual gear ratio and the selected virtual gear ratio.
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Specification