Outboard Motor Anti-Theft System Using Segmented Switches
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Solution Overview
Problem
Existing anti-theft security systems for outboard motors on ships may unintentionally start the engine due to erroneous switch manipulations, posing safety risks and steering control issues while attempting to prevent theft by setting an unlock state when the ship is at anchor.
Innovation Solution
An outboard motor anti-theft security system that includes an electronic key storing ID information, an authentication unit to verify the ID, and separate switches for authentication activation/deactivation, engine start/stop, and child lock, with a latch circuit to maintain engine start until verified, ensuring secure engine operation without authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the unlock state is set when a ship is at anchor in an offshore, then the engine can start even when the portable key unit is lost (improving usability), but the engine may unintentionally start due to erroneous switch manipulation by a child or careless manipulation of a crew (worsening safety)
Solution Approach 1:
The switch control function is segmented into multiple independent switches: authentication unit activation/deactivation switch, engine start/stop switch, and child lock switch. This segmentation allows independent control of authentication and engine start functions, preventing unintended engine starts while maintaining ease of operation through dedicated controls for each function.
2Reliability
If both the mechanical ignition key switch and the portable key unit are employed in a combined manner, then the anti-theft security is improved, but the system complexity increases and requires multiple switches and authentication mechanisms
Solution Approach 1:
The control system is divided into distinct functional switches: authentication unit activation/deactivation switch for controlling authentication, engine start/stop switch for engine control, and child lock switch for safety. This segmentation provides clear functional separation while maintaining comprehensive security through the authentication unit that verifies portable key unit credentials.
Solution Approach 2:
The authentication unit acts as an intermediary between the portable key unit and the engine control system. It verifies the portability key unit's ID information and controls the unlock state accordingly, providing a security layer that prevents unauthorized engine starts while allowing legitimate operation.
3Reliability
If the authentication unit is always activated to verify ID information, then the anti-theft security is maintained, but the ease of operation deteriorates due to constant authentication requirements
Solution Approach 1:
The authentication unit's activation state is dynamic rather than fixed. The authentication unit activation/deactivation switch allows the operator to switch between authenticated and unauthenticated states based on operational needs. When deactivated, the engine can start without authentication, providing convenience for trusted operators while maintaining security capability when activated.
Data Source
AI summary
The authentication unit stores information for causing the outboard motor control unit to permit an engine start in order to enable setting of an unlock state in which the engine start is permitted without authentication of ID information of an electronic key and a child lock state in which the engine start is permitted by performing a predetermined release operation without necessity of authenticating the ID information of the electric key.