Cylinder Oil Injection Control for Two-Stroke Diesel Lubrication
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Solution Overview
Problem
Existing cylinder lubrication systems for large slow-running two-stroke diesel engines, such as those used in ship engines, face issues where the last part stroke before retraction often results in insufficient lubrication, leading to increased wear on pistons and liners due to inadequate lubrication, compromising engine maintenance and longevity.
Innovation Solution
The system employs a progressive partial stroke motion for the dosing plungers without immediate retraction, allowing lubrication oil to be injected over multiple engine revolutions before retraction, with a computer-controlled linear actuator and position sensors to ensure adequate lubrication by comparing the remaining oil volume with a predetermined threshold, allowing early retraction if insufficient for proper lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the dosing plunger is advanced in a full stroke to maximum extension, then the lifetime of the lubrication system is increased by even wear distribution, but the engine may receive insufficient lubrication in the last part stroke
Solution Approach 1:
The system dynamically adjusts the dosing plunger stroke length based on real-time monitoring. Instead of always performing full strokes, the controller adapts the stroke length to ensure adequate lubrication is delivered, preventing the insufficiency issue while still distributing wear evenly through progressive partial strokes
Solution Approach 2:
The system incorporates monitoring means that detect whether adequate lubrication has been delivered. This feedback mechanism allows the controller to determine when to retract the dosing plunger, ensuring that engine lubrication needs are met while still achieving even wear distribution through controlled partial strokes
2Duration of action of stationary object
If the dosing plunger is retracted after insufficient lubrication in the last part stroke, then the lubrication system experiences reduced wear, but the engine suffers increased wear on pistons and liners
Solution Approach 1:
The monitoring means detects whether adequate lubrication has been delivered to the engine. This feedback prevents premature retraction that would cause insufficient lubrication, while still allowing the dosing plunger to be retracted in a controlled manner to distribute wear evenly, thus protecting both the lubrication system and engine components
Solution Approach 2:
The system dynamically determines the optimal retraction timing based on actual lubrication delivery. By adapting the operation cycle to real-time conditions, it ensures adequate engine lubrication is maintained while still achieving even wear distribution on the dosing plunger and cylinder
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 wear on the lubrication system components while maintaining proper engine lubrication, avoiding the compromise of engine maintenance seen in prior systems by ensuring sufficient lubrication is provided without relying on subsequent compensation strokes.
Implementation Method 1
a linear actuator (2) connected to the dosing plunger (21) and configured for driving said dosing plunger (21) progressively in successive partial strokes
Implementation Method 2
A sensor is provided for determining the position of the dosing plunger, the position indicating a volume of lubrication oil that is left for potential pumping
Data Source
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AI summary
A method is provided where piston pumps are used for injection of oil into engine cylinders. The pistons in the piston pumps are advanced through a plurality of partial strokes over multiple engine revolutions before being retracted.