Marine Vessel Throttle Control for Low-Speed Planing Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Maintaining a planing state of a marine vessel's hull at relatively low speed is difficult due to the challenges of manually adjusting the throttle opening angle, which can cause the hull to either lose its planing state or exceed desired speed limits.
Innovation Solution
A control system that adjusts the throttle opening angle automatically to maintain the planing state by using sensors and a controller unit to monitor pitch angle and vessel speed, adjusting the throttle angle to keep the hull in a planing state at low speed, even during deceleration or changes in conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the throttle opening angle is reduced to lower the hull speed, then the speed of the marine vessel decreases, but the hull cannot maintain its planing state
Solution Approach 1:
The control system continuously monitors the pitch angle and compares it with a predetermined threshold value to determine whether the hull is in the planing state. Based on this feedback, the system automatically adjusts the throttle opening angle to maintain the planing state even at reduced speeds. The processor executes control instructions that modify throttle positioning according to real-time pitch angle data, creating a closed-loop feedback system that resolves the contradiction between speed reduction and planing state maintenance.
Solution Approach 2:
The control system enables the marine vessel to automatically regulate its own throttle opening angle without manual intervention. The system uses the hull's own pitch angle as a feedback signal to self-adjust the throttle, allowing the vessel to maintain optimal planing conditions autonomously. This self-service mechanism eliminates the need for manual throttle adjustment while keeping the hull in the desired planing state at various speeds.
2Reliability
If the throttle opening angle is increased to maintain the planing state, then the planing state is maintained, but the speed of the hull becomes too high
Solution Approach 1:
The system dynamically adjusts the throttle opening angle based on real-time pitch angle measurements rather than using a fixed throttle position. The processor continuously evaluates whether the hull is in the planing state and modifies the throttle opening angle accordingly, allowing the system to adapt to changing operational conditions. This dynamic control enables the hull to maintain the planing state at lower speeds than would be required with conventional fixed-throttle approaches.
Solution Approach 2:
The control system changes the throttle opening angle parameter in response to pitch angle variations. By monitoring pitch angle as a key parameter and adjusting the throttle opening angle based on its relationship with the planing state, the system optimizes the speed-parameter relationship. This parameter-based control allows the vessel to maintain planing at reduced speeds by precisely controlling the throttle opening angle according to actual hull attitude.
3Device complexity
If manual adjustment of the throttle opening angle is used, then the system is simple, but it is difficult to keep the marine vessel planing at low speed
Solution Approach 1:
The system replaces manual mechanical throttle adjustment with an automated electronic control system. The processor-based control apparatus receives pitch angle signals, processes this information according to stored instructions, and automatically positions the throttle without manual intervention. This substitution of manual mechanical control with electronic automation enables reliable planing state maintenance at low speeds while accepting increased system complexity.
4Speed
If the throttle opening angle is kept small for low speed operation, then the speed is reduced, but the hull shifts from planing state to hump state
Solution Approach 1:
The control system uses pitch angle feedback to detect when the hull is transitioning from planing to hump state. When the pitch angle indicates loss of planing (falling below the predetermined threshold), the system automatically increases the throttle opening angle to restore planing conditions. This feedback mechanism prevents unstable transitions between hull states by continuously monitoring pitch angle and making corrective throttle adjustments.
Solution Approach 2:
The control system takes preliminary action by continuously monitoring pitch angle trends and adjusting the throttle opening angle before the hull completely loses its planing state. By detecting early signs of planing state deterioration through pitch angle changes, the system proactively modifies throttle positioning to prevent the transition to hump state, maintaining stable planing operation at low speeds.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A control system for a marine vessel which is capable of maintaining a planing state of a hull at relatively low speed. The control system has an opening angle adjustment unit, which adjusts a throttle opening angle of an engine in a propulsion device, and a controller. The controller judges whether or not the hull has entered the planing state, and sets a predetermined mode in which the planing state is maintained. In a case where the predetermined mode is set and it is judged that the hull has entered the planing state, the opening angle adjustment unit is controlled so as to keep the hull in the planing state even when the hull has decelerated.