Boat Kill Switch with Proximity Sensors
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Solution Overview
Problem
Existing boat safety systems fail to effectively prevent propeller injuries and damage by not adequately detecting people or objects in close proximity to spinning propellers and submerged hazards, and do not ensure the boat captain is present and positioned to operate the vessel safely.
Innovation Solution
A wireless boat safety system that includes a kill switch communicatively linked to a fob worn by the captain, proximity sensors around the stern to detect objects near the propeller, and sensors to monitor the ladder and captain's position, preventing the motor from starting or propeller engagement when hazards are detected or the captain is not present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If traditional kill switches with lanyards are used, then the captain can control the motor manually, but the system cannot detect proximity of people or objects to the propeller
Solution Approach 1:
The safety system is divided into multiple independent sensor modules (proximity sensors, ladder position sensors, captain presence sensors) that each perform a specific detection function. These segmented sensors work together to provide comprehensive safety monitoring without requiring a single complex system.
Solution Approach 2:
The kill switch assembly serves multiple functions: it traditionally controls motor operation and now also integrates wireless communication with sensors to detect various safety conditions (people proximity, ladder position, captain presence). This multi-functionality reduces the need for separate systems.
2Reliability
If proximity sensors and multiple safety sensors are added, then detection capability is improved, but the device complexity increases
Solution Approach 1:
Multiple sensor functions are merged into a single integrated kill switch assembly that processes inputs from proximity sensors, ladder position sensors, and captain presence sensors. This consolidation reduces system complexity while maintaining comprehensive safety monitoring.
Solution Approach 2:
The system continuously monitors safety conditions through sensors and provides real-time feedback to the kill switch, which automatically prevents motor operation when hazards are detected. This feedback mechanism ensures reliable safety without requiring complex manual intervention systems.
3Object-affected harmful factors
If the motor can start freely without sensor monitoring, then ease of operation is maintained, but the risk of propeller injuries increases
Solution Approach 1:
The safety system operates autonomously by automatically detecting hazards through sensors and preventing motor operation when necessary, without requiring manual intervention or complex user actions. The system serves itself by making safety decisions based on sensor inputs.
Solution Approach 2:
The kill switch acts as an intermediary between the motor and the operator, introducing safety conditions that must be met before the motor can operate. This intermediary layer filters out harmful situations while allowing normal operation to proceed when safe.
4Difficulty of detecting and measuring
If wireless communication with fob is implemented, then captain presence can be verified remotely, but the system complexity increases
Solution Approach 1:
The traditional mechanical lanyard kill switch is replaced with a wireless communication system using a fob and receiver. This substitution eliminates the need for physical contact while maintaining the safety function of verifying captain presence, and the wireless components can be integrated into existing boat electronics.
Data Source
AI summary
A safety system for a boat, watercraft or other vehicle includes a kill switch connected to the motor for preventing the motor from running under dangerous circumstances. The system includes at least one proximity sensor operatively connected to the kill switch, so that the motor only runs when the proximity sensor detects a person properly positioned at the captain's console. Other sensors may form an array to communicate with the kill switch, either hard-wired together or wirelessly, upon detection of dangerous situations, including proximity sensors to detect if a swimmer is near the propeller or if the captain is not in position at the helm, gate sensors to detect when gates on the boat are in an open position, and ladder sensors to detect when a ladder is in a down position. The system may also include at least one rear facing camera operatively connected to a console-mounted video screen.