Jet Boat Thrust Mode Switching for Low-Speed Maneuverability
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Solution Overview
Problem
Existing jet propulsion boats lack flexibility in operation modes, limiting their maneuverability and convenience.
Innovation Solution
A jet propulsion boat equipped with both an engine-driven and electric motor-driven propulsion system, allowing switching between engine and electric modes based on conditions, with a control device determining the optimal mode for operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the boat uses only an engine-driven propulsion system, then it achieves high speed and power, but it lacks operational flexibility and has limited maneuverability in different conditions
Solution Approach 1:
The propulsion system is designed to perform multiple functions by incorporating both an engine-driven motor and an electric motor. The engine-driven motor provides high-speed propulsion, while the electric motor enables maneuvering and operation at low speeds. This multi-functionality allows a single propulsion system to adapt to various operational conditions, resolving the contradiction between operational flexibility and system complexity.
Solution Approach 2:
The control device dynamically switches between engine-driven mode and electric motor mode based on real-time operational conditions such as water depth, speed requirements, and maneuvering needs. This dynamic adaptation enables the system to optimize performance for each specific condition, achieving high versatility without requiring a permanently complex multi-component system to be actively engaged at all times.
2Ease of operation
If the boat switches between engine mode and electric mode, then it improves maneuverability and operational flexibility, but it increases control system complexity
Solution Approach 1:
The control device incorporates feedback mechanisms that continuously monitor operational parameters such as water depth, boat speed, and propulsion requirements. Based on this feedback, the control device automatically determines the optimal mode (engine-driven or electric) and switches between modes accordingly. This feedback-based automation simplifies the operator's task while managing the underlying control complexity through intelligent decision-making algorithms.
Solution Approach 2:
The control device operates autonomously by self-determining the appropriate propulsion mode based on pre-programmed criteria and real-time sensor data. The system performs self-service by automatically selecting and switching between engine-driven and electric motor operation without requiring manual intervention from the operator, thereby improving ease of operation while containing control complexity within the automated system.
3Object-affected harmful factors
If the boat uses engine-driven propulsion continuously, then it maintains high speed capability, but it increases noise and vibration levels
Solution Approach 1:
The propulsion system employs periodic action by alternating between engine-driven mode and electric motor mode based on operational requirements. The engine-driven motor is activated periodically when high speed is needed, while the electric motor is used during periods requiring low speed or maneuvering. This periodic switching reduces overall noise and vibration exposure while maintaining speed capability when required, resolving the contradiction between harmful factors and speed performance.
Data Source
AI summary
A jet propulsion boat includes: a boat body; a propulsion device that imparts propulsion force to the boat body to propel the boat body; an engine and an electric motor that drive the propulsion device; and a control device that determines which of an engine mode and an electric mode is to be used as an operation mode of driving the propulsion device in accordance with a condition, the engine mode configured to drive the propulsion device with the engine and the electric mode configured to drive the propulsion device with the electric motor while stopping the engine, and controls the engine and the electric motor to drive the propulsion device in the determined operation mode.