Hybrid Watercraft Propulsion Controller Extender Mode Engine Speed
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Solution Overview
Problem
Existing watercraft propulsion systems lack effective control of the engine in extender mode, which limits the travel range and quiet operation of watercraft powered by electric propulsion.
Innovation Solution
A watercraft propulsion system that includes an engine propulsion device with a power generator, an electric propulsion device connected to a battery charged by the power generator, and a controller that manages an extender mode by adjusting engine speed based on watercraft speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the engine speed is increased to charge the battery more effectively in extender mode, then the travel range of the watercraft is extended, but the engine sound becomes louder and deteriorates the quietness of the watercraft
Solution Approach 1:
The engine speed is made dynamically adjustable based on watercraft speed conditions. The controller varies the engine speed according to the watercraft's motion state, allowing the system to optimize between battery charging efficiency and noise generation in real-time rather than maintaining a fixed high speed for charging.
Solution Approach 2:
The operating parameters of the engine (specifically speed) are changed based on the watercraft's speed state. By adjusting the engine speed parameter according to whether the watercraft is moving or stationary, the system achieves effective battery charging while minimizing noise pollution during quiet operation periods.
2Object-generated harmful factors
If the engine speed is kept low to maintain quiet operation, then the engine sound remains low, but the battery charging amount is insufficient and the travel range is limited
Solution Approach 1:
The engine speed is dynamically adjusted based on operational conditions. When the watercraft is moving, the engine can operate at higher speeds to charge the battery effectively, while when stationary or moving slowly, the engine operates at lower speeds to maintain quietness, thus resolving the contradiction between charging efficiency and noise control.
Solution Approach 2:
The engine speed parameter is varied according to the watercraft's speed state. This parameter change strategy allows the system to achieve sufficient battery charging during high-speed operation while maintaining low noise levels during low-speed or stationary operation, effectively balancing both requirements.
3Use of energy by moving object
If the engine speed is increased to provide sufficient battery charging at high watercraft speeds, then the power consumption of the electric propulsion device is compensated, but the engine sound becomes louder and impacts product value
Solution Approach 1:
The engine speed is dynamically controlled based on the watercraft's speed and power consumption requirements. This dynamic adjustment allows the system to provide sufficient power for battery charging when needed while avoiding unnecessary high-speed operation that would generate excessive noise, thus balancing energy requirements with noise control.
Solution Approach 2:
The engine operating parameters are changed according to the watercraft's operational state. By adjusting the engine speed to match the actual power consumption needs at different watercraft speeds, the system achieves efficient battery charging without consistently operating at high noise-generating speeds, thereby protecting product value.
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
The system effectively extends the travel range of watercraft powered by electric propulsion while maintaining quiet operation by adjusting engine speed according to watercraft speed, ensuring reliable battery charging without significantly impacting the product value of the watercraft.
Implementation Method 1
an engine propulsion device including a power generator, an electric propulsion device connected to a battery charged by the power generator
Data Source
AI summary
A watercraft propulsion system includes an engine propulsion device including a power generator, an electric propulsion device connected to a battery charged by the power generator, and a controller. The controller includes an extender mode in which the electric propulsion device generates a propulsive force and the power generator of the engine propulsion device is driven to charge the battery. The controller is configured or programmed to change an engine speed of the engine propulsion device according to a watercraft speed in the extender mode.