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US 12,551,996 B2Granted
Torque control tool
AssigneeIngersoll-Rand Industrial U.S., Inc.
InventorsMark T. McClung, Timothy R. Cooper, Warren A. Seith, Douglas E. Pyles
Life of this patent
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Abstract
A power tool and method of controlling a motor of the power tool based on a determination of torque is provided. The method of determining torque uses the energy output by the drive mechanism and the angle of rotation of the output shaft to estimate torque. The energy is determined by subtracting efficiency losses (or gains) from a nominal energy of the drive mechanism in order to improve the torque estimation.
Claims20
A method of controlling a power tool, comprising:
- measuring, via a first sensor, an angle of rotation of an output shaft of the power tool in response to a hammer mechanism rotating the output shaft;
- determining, via a controller communicatively coupled to the first sensor, the angle of rotation based on the measurement of the first sensor;
- determining, via the controller, a first energy value of the power tool based on the determined angle of rotation, the first energy value being a change of energy of the hammer mechanism during the angle of rotation;
- measuring, via a second sensor, a second energy value of the power tool, the second energy value being an energy loss from the first energy to a component of the power tool different from the output shaft during the angle of rotation;
- determining, via the controller communicatively coupled to the second sensor, the second energy value;
- determining, via the controller, an applied torque to the output shaft based on an energy difference between the first energy value and the second energy value, the energy difference being an estimate of energy transferred to the output shaft with the energy loss removed;
- and
- controlling, via the controller, a motor of the power tool based on the determined applied torque.
5 more elements
Dependencies are inferred from the claim text.