Adaptive impact blow detection
First Claim
1. A method of detecting an impact of a power tool, the method comprising:
- driving, by a motor, a hammer of the power tool to deliver impacts to an anvil of the power tool;
determining a motor characteristic indicative of a speed of the motor;
when the motor characteristic indicates that the speed of the motor is below a speed threshold,employing an acceleration-based technique to detect a first impact based on a change in motor acceleration, andgenerating a first impact indication in response to detecting the first impact; and
when the motor characteristic indicates that the speed exceeds the speed threshold,employing a time-based technique to detect a second impact based on an elapsed time, andgenerating a second impact indication in response to detecting the second impact.
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Accused Products
Abstract
A power tool and method of detecting impacts of a power tool that includes a motor driving a hammer to impact an anvil. A motor control unit is configured to determine a motor characteristic indicative of a speed of the motor. When the motor characteristic indicates that the speed of the motor is below a speed threshold, the motor control unit employs an acceleration-based technique to detect a first impact based on a change in motor acceleration and generate a first impact indication in response to detecting the first impact. When the motor characteristic indicates that the speed is above the speed threshold, the motor control unit employs a time-based technique to detect a second impact based on an elapsed time and generates a second impact indication in response to detecting the second impact.
230 Citations
14 Claims
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1. A method of detecting an impact of a power tool, the method comprising:
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driving, by a motor, a hammer of the power tool to deliver impacts to an anvil of the power tool; determining a motor characteristic indicative of a speed of the motor; when the motor characteristic indicates that the speed of the motor is below a speed threshold, employing an acceleration-based technique to detect a first impact based on a change in motor acceleration, and generating a first impact indication in response to detecting the first impact; and
when the motor characteristic indicates that the speed exceeds the speed threshold,employing a time-based technique to detect a second impact based on an elapsed time, and generating a second impact indication in response to detecting the second impact. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of detecting an impact of a power tool, the method comprising:
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driving, by a motor, a hammer of the power tool to deliver impacts to an anvil of the power tool; determining a motor characteristic indicative of a speed of the motor; setting an acceleration threshold based on the motor characteristic; detecting, by a processor, an impact based on a change in motor acceleration exceeding the acceleration threshold; and generating, by the processor, an impact indication in response to detecting the impact. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of detecting an impact of a power tool, the method comprising:
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driving, by a motor, a hammer of the power tool to deliver impacts to an anvil of the power tool; determining a motor characteristic indicative of a speed of the motor; setting an acceleration threshold based on the motor characteristic; detecting, by a processor, an impact based on a change in motor acceleration exceeding the acceleration threshold; generating, by the processor, an impact indication in response to detecting the impact; determining that the motor characteristic indicates that the speed of the motor exceeds a speed threshold; determining that a current of the motor exceeds a current threshold; and employing a time-based technique to detect a second impact when the speed of the motor exceeds the speed threshold and the current of the motor exceeds the current threshold.
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Specification