Marine Propulsion Start Control With Motor Readiness Notification
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Solution Overview
Problem
Existing marine vessel maneuvering systems with electric motors do not provide clear auditory or visual cues to indicate when the motor is ready to be driven, making it difficult for users to recognize the operational state.
Innovation Solution
A marine vessel maneuvering system with a controller that switches the electric motor to a ready-to-be-driven state upon user input, accompanied by visual and auditory notifications, and includes a neutral retention switch to prevent unintended operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric motor is activated when the main switch is turned on, then the motor is ready to be driven, but the user cannot recognize the operational state through sound cues
Solution Approach 1:
A notification device is introduced as an intermediary between the control system and the user. This device provides visual or auditory signals to indicate when the electric motor is ready to be driven, compensating for the lack of natural engine sound that would otherwise serve as a readiness cue.
Solution Approach 2:
The system implements feedback through the notification device that communicates the operational state of the electric motor back to the user. When the motor reaches readiness state, the notification device activates to inform the user, creating a closed-loop information flow that resolves the information loss.
2Productivity
If the electric motor can be driven immediately after power supply, then system responsiveness is improved, but unintended operation may occur
Solution Approach 1:
The system performs preliminary actions by first activating the main power supply and then requiring a separate start operation to drive the electric motor. This two-stage activation process ensures that the motor is prepared but not executed until the user explicitly intends to operate it, preventing unintended startup while maintaining system responsiveness.
Solution Approach 2:
The control system implements preliminary anti-action by blocking the drive command until proper sequencing is completed. The motor controller is configured to reject drive commands until after the start operation is detected, creating a protective barrier against unintended operation while preserving the ability to respond quickly once activated.
3Reliability
If a start switch operation is required to drive the motor, then user intention is confirmed, but system complexity increases
Solution Approach 1:
The start switch serves multiple functions: it confirms user intention to operate the motor, triggers the motor controller to accept drive commands, and activates the notification device to inform the user of readiness state. By consolidating these functions into a single operation, the system confirms operational intent without proportionally increasing complexity.
Data Source
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AI summary
A marine vessel maneuvering system (102) includes a marine propulsion unit (1) including an electric motor (12), an input (2) configured to input a neutral command (E1) to stop the electric motor and configured to input a drive command (E2, E3) to drive the electric motor, a start switch (31) configured to switch a stopped state in which the electric motor is not driven to a ready-to-be-driven state in which the electric motor is ready to be driven, and a controller (7) configured or programmed to perform a control to switch the stopped state to the ready-to-be-driven state upon a user operating the start switch when a main power supply that controls a power supply to an on-board device (D) of a hull (101) is in an on state, the neutral command is being input to the input, and a marine vessel is in the stopped state.