Hand-held Power Tool Percussion Sensor Signal Filtering
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Solution Overview
Problem
Hand-held power tools with percussion mechanisms face challenges in reliably detecting percussion characteristics, leading to inefficient operation, potential functional defects, and reduced performance, especially in transitioning from idling to percussion mode.
Innovation Solution
A sensor unit with a filter unit is integrated into the hand-held power tool to detect mechanical measured quantities, specifically percussion characteristics, using sensors like acceleration and structure-borne sound sensors, and employing analog or digital filters to isolate and amplify relevant signal components, thereby improving detection reliability and reducing disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor unit is added to detect percussion characteristics, then operational reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical detection methods with sensor-based detection systems. Acceleration sensors and structure-borne sound sensors are used to detect percussion characteristics, substituting traditional mechanical measurement approaches and enabling more reliable detection of percussion mode operation.
Solution Approach 2:
The patent introduces sensor units as intermediary components between the percussion mechanism and the control system. These sensors act as mediators that convert physical percussion characteristics into electrical signals that can be processed by the control unit, enabling indirect but reliable detection of operational states.
2Measurement precision
If filter units are used to isolate signal components, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and isolates specific signal components from the overall sensor signal using filter units. The filter unit separates the percussion-related signal components from other vibrations and noise, allowing precise detection of percussion characteristics by taking out only the relevant information from the complex signal mixture.
3Productivity
If the percussion mechanism is operated in an above-critical performance range, then productivity is improved, but reliability worsens
Solution Approach 1:
The patent implements a feedback control system where the control unit continuously monitors percussion characteristics through sensor units and adjusts operating parameters accordingly. When the percussion mechanism operates in an above-critical performance range, the system detects this state and provides feedback to adjust the drive rotational speed or ventilation, preventing reliability degradation while maintaining high productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances operational reliability, performance, and energy efficiency by accurately identifying percussion characteristics, allowing for adaptive adjustments in drive rotational speed and ventilation, thus improving the tool's performance and reducing the likelihood of functional defects.
Implementation Method 1
at least one sensor for at least one mechanical measured quantity, wherein the sensor unit is provided to detect at least one percussion characteristic quantity
Implementation Method 2
using sensors like acceleration and structure-borne sound sensors
Data Source
AI summary
The disclosure relates to a hand-held power tool comprising a percussion mechanism, especially a rotary hammer and/or percussion hammer. According to the disclosure, at least one sensor unit comprising at least sensor for at least one mechanical measurement variable is provided for detecting at least one percussion parameter.