Portable Machine Tool Adaptive Braking Using Sensor Feedback
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Solution Overview
Problem
Existing power tool devices lack adaptive braking capabilities, leading to inefficient and potentially hazardous operation, as they cannot dynamically adjust braking functions based on real-time characteristic variables of the tool and work environment.
Innovation Solution
A power tool device equipped with an acquisition unit that senses various characteristic variables, such as drive, startup, rotational speed, torque, and kickback, to automatically and dynamically adapt the braking function using an open-loop or closed-loop control unit, ensuring precise and safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing power tool devices use fixed braking functions, then device complexity is reduced, but operational safety and adaptability deteriorate
Solution Approach 1:
The braking function is transformed from a fixed, static configuration to a dynamic, adaptable system that automatically adjusts braking parameters based on real-time characteristic variables detected by sensors. The control unit dynamically modifies braking force, timing, and duration according to operating conditions such as tool type, workpiece material, and operational state, thereby improving operational safety while maintaining manageable device complexity through automated adaptation.
Solution Approach 2:
The system incorporates sensors that continuously monitor characteristic variables (e.g., rotational speed, torque, acceleration) and feed this information back to the control unit. The control unit processes this feedback and automatically adjusts the braking function accordingly, creating a closed-loop control system that enhances operational safety without requiring manual intervention or complex mechanical adjustments.
2Adaptability or versatility
If power tool devices implement adaptive braking based on characteristic variables, then operational safety improves, but device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it processes signals from various sensors, determines characteristic variables, decides on appropriate braking actions, and controls the braking mechanism. This multi-functional approach consolidates what could be separate complex subsystems into a single integrated unit, thereby achieving high braking adaptability across different tool types and operating conditions while keeping the overall device complexity manageable.
Solution Approach 2:
The braking system is designed to automatically determine and adjust its parameters based on characteristic variables detected by integrated sensors. The system serves itself by autonomously sensing operating conditions, processing this information, and implementing appropriate braking actions without external intervention, thereby achieving high adaptability while minimizing the complexity of manual adjustment mechanisms.
3Measurement precision
If braking function is dynamically adapted using sensors and control units, then operational safety and braking precision improve, but device complexity and cost increase
Solution Approach 1:
The system merges the sensing function, measurement function, and control function into an integrated architecture. Sensors detect characteristic variables, the control unit processes these measurements and determines appropriate braking parameters, and the braking mechanism executes the controlled action. This merging of functions into a coordinated system achieves high measurement and control precision while avoiding the complexity of separate, independent subsystems for each function.
Data Source
AI summary
A machine tool device in one embodiment is configured to provide open-loop and/or closed-loop control of at least one machine tool function of a portable machine tool. The machine tool device includes at least one detection unit configured to detect at least one characteristic variable of the machine tool and/or of a processing tool arranged on the machine tool. The machine tool device further includes at least one brake unit, wherein at least one brake function of the brake unit is adapted at least partially automatically, and in particular dynamically, depending on the at least one detected characteristic variable.