Boat Propulsion Unit Clutch Control for Fixed Point Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing boat propulsion systems, such as those described in JP-B-3499204, face difficulties in accurately retaining a boat at a fixed point due to the inability to finely adjust propulsive forces.
Innovation Solution
A boat propulsion unit comprising a power source, propeller, output shaft, shift position switching mechanism, and control device, where the shift position switching mechanism includes hydraulic clutches that can be adjusted by a control device to switch between forward, neutral, and reverse, allowing for precise engagement force control to maintain a boat at a predetermined position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed point retention control system is implemented using conventional actuator control, then the boat can maintain position control, but the retention accuracy is insufficient
Solution Approach 1:
The clutch engagement force is made dynamically adjustable through electronic control, allowing the transmission system to adapt its characteristics for precise position retention. The control unit varies the clutch engagement state to achieve fine control of propulsive force, transforming a static mechanical system into a dynamic controllable one.
Solution Approach 2:
The engagement force parameter of the clutch is changed and controlled by the control unit to achieve different transmission states. By adjusting this parameter, the system can provide fine control over propulsive force output, enabling accurate position retention that was not possible with conventional fixed-state actuators.
2Ease of operation
If conventional actuator control is used for fixed point retention, then the system structure remains simple, but the ability to finely adjust propulsive force is insufficient
Solution Approach 1:
The conventional mechanical actuator control system is replaced with an electronic control system that directly controls the clutch engagement force. This substitution enables precise electronic modulation of the clutch state, providing fine propulsive force adjustment capability while keeping the mechanical transmission structure relatively simple.
Solution Approach 2:
The clutch control system serves multiple functions: it controls shift positions (forward, neutral, reverse) and simultaneously provides fine propulsive force adjustment for position retention. This multi-functionality allows the same control mechanism to handle both gross movement control and fine position adjustment.
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
This configuration enables accurate and precise retention of a boat at a fixed point by allowing for fine adjustments in propulsive force, overcoming the limitations of previous systems that struggled with maintaining stability.
Implementation Method 1
The clutch changes a connection state between the input shaft and the output shaft. A shift position of the shift position switching mechanism is switched among forward, neutral, and reverse by engaging and disengaging the clutch.
Data Source
AI summary
A boat propulsion unit includes a power source, a propeller, a shift position switching mechanism, a control device, and a retention switch. The propeller is driven by the power source to generate propulsive force. The shift position switching mechanism has an input shaft connected to a side of the power source, an output shaft connected to a side of the propeller, and clutches that change a connection state between the input shaft and the output shaft. A shift position of the shift position switching mechanism is switched among forward, neutral, and reverse by engaging and disengaging the clutches. The control device adjusts an engagement force of the clutches. The retention switch is connected to the control device. When the retention switch is turned on by an operator, the control device controls the engagement force of the clutches to retain a hull in a predefined position. The boat propulsion unit provides a boat propulsion unit that can accurately retain a boat at a fixed point.