Marine Propulsion Control Device Ventilation Detection
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Solution Overview
Problem
Existing control devices for marine propulsion systems struggle to accurately determine the occurrence of ventilation, which is influenced by hull speed, throttle operation, and other factors beyond just engine rotation speed and actual rpm.
Innovation Solution
A control device that acquires engine or propeller rpm, engine torque, and hull speed to determine ventilation, using suppression control maps to adjust throttle settings and prevent over-rotation, thereby accurately identifying and mitigating ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ventilation determination is based only on target rpm and actual rpm, then the control system is simple, but the ventilation detection accuracy is insufficient
Solution Approach 1:
The patent changes the parameters used for ventilation detection from only rpm-based parameters to include multiple parameters (rpm, torque, hull speed, acceleration). This allows more accurate ventilation detection by considering the actual operating conditions that affect propeller performance, resolving the contradiction between simple control and accurate detection.
2Measurement precision
If multiple parameters (rpm, torque, hull speed) are used to determine ventilation, then ventilation detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent segments the ventilation detection process into distinct functional modules: rpm acquisition module, torque acquisition module, hull speed acquisition module, and determination module. Each module handles a specific aspect of data collection or processing, which reduces the overall system complexity while enabling multi-parameter analysis for accurate ventilation detection.
Solution Approach 2:
The patent introduces a central determination module that acts as an intermediary, receiving data from multiple sensors (rpm sensor, torque sensor, speed sensor) and processing this information to determine ventilation occurrence. This intermediary structure simplifies the system architecture by centralizing the complex decision-making logic while maintaining accurate multi-parameter detection.
Data Source
AI summary
A control device of a marine propulsion device, which has an engine and a propeller and is mounted on a hull. The control device includes a processor, and a non-transitory storage medium having program instructions stored thereon. The execution of the program instructions by the processor causes the control device to acquire a rotation speed of the engine or a rotation speed of the propeller, acquire a torque of the engine, acquire a speed of the hull, and determine whether a ventilation of the engine has occurred based on at least two among the acquired rotation speed, the acquired engine torque, and the acquired hull speed.