Water Jet Boat Reverse Gate Throttle Synchronization
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Solution Overview
Problem
Existing water jet propulsion boats lack natural speed reduction performance, as the reverse gate operation is not synchronized with the throttle control, resulting in unnatural speed changes and reduced responsiveness to operator inputs.
Innovation Solution
A water jet propulsion boat with a control system that adjusts the position of the reverse gate and throttle opening based on the operation amounts of the first and second accelerator sections, allowing for precise speed control and natural speed reduction according to operator input, using a combination of sensors and electronic control units to manage the engine and gate positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reverse gate is moved after the propulsion power has been sufficiently reduced, then the boat can reverse or reduce speed, but the speed reduction performance does not match the lever operation amount
Solution Approach 1:
The control section continuously monitors the lever operation amount and dynamically adjusts both the reverse gate position and throttle opening in real-time based on this feedback. This closed-loop control ensures that the speed reduction matches the operator's intended lever operation amount, resolving the contradiction between reliable speed control and natural speed reduction performance
Solution Approach 2:
The system dynamically adjusts the reverse gate position and throttle opening based on the changing lever operation amount rather than using fixed positions. This dynamic adjustment allows the speed reduction to naturally follow the operator's input, transforming a static control system into a responsive one that adapts to operator intentions
2Speed
If the rotation speed of the engine is reduced without relation to the lever operation amount, then the engine rotation speed can be controlled, but the natural speed reduction performance according to lever operation amount is lost
Solution Approach 1:
The control section uses the lever operation amount as continuous feedback to determine both the reverse gate position and throttle opening. This ensures that engine rotation speed is reduced in direct relation to the operator's lever input, maintaining natural speed reduction performance while achieving controlled engine speed
Solution Approach 2:
The system merges the control of reverse gate position and throttle opening into a unified control scheme based on lever operation amount. Instead of controlling these parameters independently, both are adjusted together based on the same feedback signal, creating a coordinated response that preserves natural speed reduction characteristics
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
Enables natural speed reduction performance and improved responsiveness to operator inputs, providing stable and controlled motion by synchronizing the reverse gate and throttle adjustments with the operator's actions, enhancing the overall driving experience.
Implementation Method 1
The jet propulsion mechanism generates a propulsion power using a drive power from the engine
Implementation Method 2
The reverse gate changes the orientation of the jet of water to the front of the boat body in the reverse position
Data Source
AI summary
A water jet propulsion boat includes a boat body, an engine, a jet propulsion mechanism, a first accelerator operation section, a second accelerator operation section, a reverse gate, and a control section. The engine is accommodated in the boat body. The jet propulsion mechanism generates a propulsion power using a drive power from the engine. The reverse gate is arranged to move to a first position and to a second position. The boat body advances when the reverse gate is in the first position. The reverse gate reduces the propulsion power which advances the boat body when the reverse gate is in the second position. The control section is programmed to set the position of the reverse gate and a throttle opening of the engine based on an operation amount of the first accelerator operation section and an operation amount of the second accelerator operation section.