Starting Air System Leakage Detection for Marine Engines
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Solution Overview
Problem
Internal combustion engines face the risk of potential explosions due to leakage from malfunctioning cylinder starting valves, which allows the fuel/air mixture to accumulate in the engine room, as existing systems lack effective monitoring and control mechanisms to detect and address such leaks.
Innovation Solution
A method and system for monitoring the starting air system by creating a closed volume upstream of the cylinder starting valves, using sensors to detect parameters like pressure, methane, and CO2 concentrations, and outputting signals for leakage detection, allowing the control unit to manage engine operation and prevent accumulation of unburned mixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a starting air system is used to accelerate the internal combustion engine, then the engine can be started and operated, but malfunctioning cylinder starting valves may leak fuel/air mixture into the starting air manifold creating explosion danger
Solution Approach 1:
The system performs preliminary monitoring of the starting air system during engine operation to detect potential leaks before they create hazardous conditions. The control unit continuously checks parameters such as starting air pressure and cylinder pressure to identify malfunctioning valves early, preventing fuel/air mixture accumulation and explosion risks.
Solution Approach 2:
The system implements feedback control by continuously monitoring starting air pressure, cylinder pressure, and other parameters during engine operation. When deviations indicating potential leaks are detected, the control unit receives feedback signals and responds by adjusting engine operation or alerting operators, creating a closed-loop safety system that prevents harmful leakage effects.
2Reliability
If cylinder starting valves are monitored during fuel based operation, then leakage can be detected early, but the system complexity increases with additional sensors and control mechanisms
Solution Approach 1:
The control unit performs multiple functions: it controls engine operation, monitors starting air pressure, checks cylinder pressure, detects leakage conditions, and manages safety responses. By making the control unit multi-functional, the system achieves comprehensive leakage detection without adding separate dedicated monitoring devices, thereby limiting complexity increase.
Solution Approach 2:
The system uses the existing starting air system components and operational parameters to monitor for leaks. The same starting air pressure measurements needed for normal operation are also used to detect potential leakage conditions, allowing the system to monitor itself without requiring entirely separate monitoring infrastructure.
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 approach reduces the risk of explosions by continuously monitoring the starting air system, enabling early detection of leaks and adjusting engine operation to prevent fuel/air mixture accumulation, thereby ensuring safe and efficient engine operation.
Implementation Method 1
detecting a parameter that is characteristic of the filling of the closed volume and that deviates from an expected parameter indicating a proper operability of the starting air system, such as the cylinder starting valves
Implementation Method 2
the parameter may be a temporal pressure change indicating the pressure change within the closed volume, a methane concentration indicating the methane concentration within the closed volume
Implementation Method 3
and/or a CO2 concentrating indicating the CO2 concentration within the closed volume
Implementation Method 4
In yet some embodiments, the detected parameter may be a temporal methane concentration change, a temporal CO2 concentration change, and/or a temporal temperature change
Data Source
Figure 1
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AI summary
The present disclosure relates to an internal combustion engine (10) comprising at least one cylinder (26A to 26D) for combusting a mixture of fuel and air therein, and a starting air system (90) configured to provide pressurized starting air to the at least one cylinder (26A to 26D) and configured for monitoring the operability of the starting air system (90). The exemplary disclosed starting air system (90) may include a starting air manifold (95) fluidly connected to a pressurized starting air source (91) configured to store pressurized starting air, a starting air venting valve (99) fluidly connected to the starting air manifold (95) and configured to vent the starting air system (90), and a sensing device (100) configured to detect a parameter that is characteristic of the filling of the starting air system (90).