Gear ratio emulation
First Claim
1. A work machine, comprising:
- a power device comprising a rotary output,a range selector input configured to select a range,a traction element,a transmission configured to provide a transmission ratio between the power device and the traction element, where the selected range corresponds to a plurality of transmission ratios,an operator input device selectively configured to have a plurality of positions, anda control system operatively coupled to the power device, the control system comprising a first performance curve and a second performance curve, each of the first and second performance curves expressing torque of the power device as a function of rotational speed of the rotary output of the power device;
wherein, the first performance curve includes a first no-load speed and the second performance curve includes a second no-load speed which is equal to or greater than the first no-load speed;
further wherein, for a given transmission ratio, a given operator input device position, and given range selector input, the control system is configured to switch the power device between the first performance curve and the second performance curve.
1 Assignment
0 Petitions
Accused Products
Abstract
The present disclosure provides a method for selectively controlling a work machine according to a current power device load response. The work machine includes a power device having a rotary output, a traction element, a transmission configured to provide a transmission ratio between the power device and traction element, an operator input device having a plurality of positions, and a control system. The method includes receiving selected range and a position of the operator input device, determining a no-load ground speed target as a function of selected range and input device position, and determining a desired ground speed load response as a function of the selected range. A desired transmission ratio is determined as a function of current machine ground speed and machine load. The method also includes determining a command to the power device as a function of a current transmission ratio and no-load ground speed target, determining a desired power device load response as a function of desired transmission ratio and desired ground speed load response, and selectively controlling the machine by switching between the current power device load response and the desired power device load response.
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Citations
25 Claims
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1. A work machine, comprising:
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a power device comprising a rotary output, a range selector input configured to select a range, a traction element, a transmission configured to provide a transmission ratio between the power device and the traction element, where the selected range corresponds to a plurality of transmission ratios, an operator input device selectively configured to have a plurality of positions, and a control system operatively coupled to the power device, the control system comprising a first performance curve and a second performance curve, each of the first and second performance curves expressing torque of the power device as a function of rotational speed of the rotary output of the power device; wherein, the first performance curve includes a first no-load speed and the second performance curve includes a second no-load speed which is equal to or greater than the first no-load speed; further wherein, for a given transmission ratio, a given operator input device position, and given range selector input, the control system is configured to switch the power device between the first performance curve and the second performance curve. - View Dependent Claims (2, 3, 4, 5)
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6. A method for selectively controlling a work machine operating according to a current power device load response, the work machine including a power device having a rotary output, a traction element, a transmission configured to provide a transmission ratio between the power device and traction element, an operator input device having a plurality of positions, and a control system, the method comprising:
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receiving selected range and a position of the operator input device; determining a no-load ground speed target as a function of selected range and input device position; determining a desired ground speed load response as a function of selected range; determining a desired transmission ratio as a function of current machine ground speed and machine load; determining a command to the power device as a function of a current transmission ratio and no-load ground speed target; determining a desired power device load response as a function of desired transmission ratio and desired ground speed load response; and selectively controlling the machine by switching between the current power device load response and the desired power device load response. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 25)
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19. A method of determining desired ground speed load response for a work machine having a transmission which provides an arbitrary transmission ratio, a power device having a rotary output, an operator input device, and a control system including power device speed control, the method comprising:
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receiving a current input position from a operator input device and range selection from a range selector; determining a desired no-load ground speed based on the current input position and selected range; and determining desired ground speed load response based on the selected range; wherein, the desired no-load ground speed and the desired ground speed load response are independent of the transmission ratio. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification