Hand-Guided Tool Control With Presence Detection and State Switching
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Solution Overview
Problem
Existing hand-guided garden, forestry, and construction working apparatuses lack intuitive and adaptable operator control systems, often requiring specific activation times and settings, which can lead to unintentional operation and increased risk of damage.
Innovation Solution
A hand-guided apparatus with an inactive and active state, featuring a user-activated operator control element that allows for automatic transition between states and setting changes without fixed activation times, incorporating a presence-detection element to prevent unintentional operation, and a motor operator control element that can be moved by the user for single-handed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed activation time periods are required for operation control, then operational precision is improved, but ease of operation deteriorates
Solution Approach 1:
The control system automatically determines the appropriate activation time period based on the operational state and stored time periods, eliminating the need for the operator to manually specify timing parameters. The system serves itself by selecting from pre-stored time periods associated with different operational states.
Solution Approach 2:
Multiple activation time periods are pre-stored in the storage element, each associated with different operational states. This preliminary preparation allows the control system to quickly select the appropriate time period without requiring real-time calculation or complex operator input.
2Reliability
If multiple activation conditions are required to prevent unintentional operation, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The control system continuously monitors the operational state and uses this feedback to determine whether to activate the drive motor. The activation decision is based on feedback from the operational state evaluation, ensuring that the motor only starts when appropriate conditions are met.
Solution Approach 2:
The control system dynamically adapts its activation requirements based on the current operational state. Different operational states have different associated activation time periods and control elements, allowing the system to be more permissive when safe and more restrictive when potentially hazardous.
3Device complexity
If fixed operational settings are used, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The control system is designed to handle multiple operational states and corresponding drive motor operations using a unified control architecture. The same control element and evaluation routine serve multiple functions by adapting to different operational states and selecting appropriate pre-stored time periods.
Solution Approach 2:
The system changes operational parameters such as activation time periods based on the detected operational state. Rather than requiring separate control mechanisms for each operating condition, the system adjusts parameters like time periods and control element activation requirements based on the current state.
4Reliability
If complex activation procedures are required, then safety is improved, but productivity deteriorates
Solution Approach 1:
Multiple activation time periods and control parameters are pre-calculated and stored before operation begins. This preliminary preparation eliminates the need for complex real-time calculations, allowing the system to quickly activate the drive motor when safety conditions are met.
Solution Approach 2:
The control system automatically evaluates safety conditions and selects appropriate activation parameters without requiring complex operator procedures. The system serves itself by monitoring operational states and making activation decisions based on pre-stored safety criteria and time periods.
Data Source
AI summary
A hand-guided garden, forestry and/or construction working apparatus has an inactive state, an active state and a variable setting, as well as an apparatus operator control element which can be activated by a user. In the inactive state, the garden, forestry and/or construction working apparatus is designed to be transferred into the active state triggered by activation of the apparatus operator control element, and in the active state the garden, forestry and/or construction working apparatus is designed to change the setting and not to be transferred into the inactive state triggered by activation of the apparatus operator control element.