Patent ID: 11919135
Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 8:
9. A power tool comprising:
a power switching network coupled between a battery pack interface and the motor;
and
a controller coupled to the power switching network to control operation of the motor, the controller configured to:
determine a first indication of current on a current path between the battery pack interface and the motor and a second indication of current on the current path,
determine a difference between the first indication of current and the second indication of current,
determine whether the difference between the first indication of current and the second indication of current exceeds a predetermined divergence threshold,
determine that the power tool is in a loaded state when the difference between the first indication of current and the second indication of current exceeds the predetermined divergence threshold,
wherein, when the difference between the first indication of current and the second indication of current does not exceed the predetermined divergence threshold,
determine whether the second indication of current exceeds a predetermined load current threshold,
determine that the power tool is in the loaded state when the second indication of current exceeds the predetermined load current threshold, and
determine that the power tool is in an unloaded state when the second indication of current does not exceed the predetermined load current threshold.