Trigger profile for a power tool
First Claim
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1. A method for operating a power tool having an output shaft, comprising:
- receiving an input control variable from an input unit;
determining a derivative of the input control variable, said derivative being at least one of a first derivative or a second derivative;
selecting one of a plurality of control profiles based on the control input variable and the derivative, each control profile correlating the control input variable of the input unit to a rotational speed at which to drive the output shaft; and
driving the output shaft at a rotational speed in accordance with the selected control profile.
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Abstract
An improved method is provided for operating a power tool. The method includes receiving an input control variable from an input unit; determining a second derivative of the input control variable; selecting one of a plurality of control profiles based on the control input variable and the second derivative, each control profile correlating the control input variable of the input unit to a rotational speed at which to drive the output shaft; and driving the output shaft at a rotational speed in accordance with the selected control profile.
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Citations
14 Claims
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1. A method for operating a power tool having an output shaft, comprising:
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receiving an input control variable from an input unit; determining a derivative of the input control variable, said derivative being at least one of a first derivative or a second derivative; selecting one of a plurality of control profiles based on the control input variable and the derivative, each control profile correlating the control input variable of the input unit to a rotational speed at which to drive the output shaft; and driving the output shaft at a rotational speed in accordance with the selected control profile. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power tool comprising:
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a housing; an output member configured to rotate about a longitudinal axis; a motor contained in the housing and driveably connected to the output member to impart rotary motion thereto; an input unit configured to output an input control variable in response to a user action; and a controller in the housing configured to calculate a derivative of the input control variable, select one of a plurality of control profiles based on the control input variable and the derivative, and drive the output shaft via the motor at a rotational speed in accordance with the selected control profile, wherein each control profile correlating the control input variable of the input unit to a rotational speed at which to drive the output shaft, the derivative being at least one of a first derivative or a second derivative. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification