Handheld Controller Logic Interlock for Slope Mower Safety
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Solution Overview
Problem
Remote-controlled slope mowers face challenges in safety and control on steep terrain due to the risk of sliding, falling, and overturning, and existing systems lack effective measures to prevent loss of control or ensure user and bystander safety.
Innovation Solution
The implementation of a handheld unit with a logic-implemented safety interlock for the PTO switch, incorporation of an inclinometer and motion sensors to control mower operation, and a visual indicator to display the tilt angle, ensuring safe and controlled operation on steep slopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If remote control capability is implemented for mower operation, then user safety distance from cutting blades is improved, but control precision and response time deteriorate
Solution Approach 1:
The handheld controller serves as an intermediary device between the user and the mower, enabling remote operation while maintaining precise control. The controller includes safety interlock logic that mediates between user inputs and mower responses, ensuring controlled activation of PTO and drive systems even at remote distances.
2Reliability
If safety interlock logic is added to prevent simultaneous activation of PTO and drive systems, then operational safety is improved, but device complexity increases
Solution Approach 1:
The safety interlock logic is merged into the handheld controller's existing control architecture, combining safety functions with operational controls in a single integrated device. This approach improves reliability by preventing simultaneous PTO and drive activation while avoiding the need for separate safety devices that would increase overall system complexity.
3Reliability
If inclinometer and motion sensors are incorporated into the handheld unit, then safety monitoring capability is improved, but device complexity and cost increase
Solution Approach 1:
The handheld controller is designed with multi-functionality, serving both as an operational control device and a safety monitoring system. By integrating inclinometer and motion sensor capabilities into the universal handheld unit, the system achieves improved safety monitoring without adding separate dedicated safety devices, thereby limiting the increase in device complexity.
4Object-affected harmful factors
If the system operates as if switches are in safe default state when activated during unsafe conditions, then user and bystander safety is improved, but operational productivity decreases
Solution Approach 1:
The system implements preliminary anti-action by detecting unsafe conditions (such as excessive tilt angles) before allowing operation, and automatically preventing activation of PTO or drive systems. This preemptive safety measure ensures user and bystander protection by blocking potentially harmful operations before they can occur, even though it requires operators to reposition the mower to achieve safe operating conditions.
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
Enhances safety and functionality by preventing unsafe operations, maintaining control, and providing real-time feedback on mower tilt, thereby reducing the risk of accidents on steep terrain.
Implementation Method 1
Another aspect relates to incorporating an inclinometer and/or motion sensor such as an accelerometer into the handheld unit, and controlling operation of the mower based on output(s) from such sensor(s)
Implementation Method 2
Another aspect relates to incorporating an inclinometer and/or motion sensor such as an accelerometer into the handheld unit, and controlling operation of the mower based on output(s) from such sensor(s)
Data Source
AI summary
Mowing systems include a remote control unit such as a handheld unit for use with a mower, between which is provided 1- or 2-way communications. Components and features are included in the mower, the remote control unit, or both to enhance the safety, functionality, or user experience of the system's user/operator. One aspect relates to a handheld unit having a logic-implemented safety interlock for a PTO switch and/or a speed switch to prevent such switches from becoming active simultaneously with an enablement command for the PTO unit and/or drive unit of the mower. Another aspect relates to incorporating an inclinometer and/or motion sensor such as an accelerometer into the handheld unit, and controlling operation of the mower based on outputs) from such sensor(s). Another aspect relates to providing a display or other visual indicator on the handheld unit, and displaying on the visual indicator an indication of a tilt angle of the mower.