Dual Fuel Engine Cylinder Misfire Mitigation via Liquid Fuel Purging
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Solution Overview
Problem
Dual fuel engines experience cylinder misfires due to accumulation of residual combustion gas and air during reduced fuel consumption conditions, leading to abnormal engine operation and potential cessation of cylinder function, as existing detection systems do not monitor individual cylinder pressures effectively.
Innovation Solution
A control system with sensors coupled to each cylinder to monitor conditions and transmit signals to a controller, which determines abnormal operating conditions and adjusts liquid fuel supply to each cylinder, increasing fuel flow to mitigate misfires by purging accumulated gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If liquid fuel supply is reduced during motoring condition, then fuel consumption is decreased, but combustion gas accumulates in the diesel injector causing cylinder misfire
Solution Approach 1:
The control system continuously monitors cylinder pressure and detects abnormal conditions (indicating combustion gas accumulation) in real-time. When misfire conditions are detected, the system automatically increases liquid fuel supply to the affected cylinder, creating a closed-loop feedback mechanism that prevents misfire while minimizing unnecessary fuel consumption during normal motoring operation.
Solution Approach 2:
The system detects abnormal cylinder conditions before complete misfire occurs by monitoring cylinder pressure changes. By identifying the accumulation of combustion gas in the diesel injector early, the control system can proactively increase liquid fuel supply to prevent misfire, rather than waiting for the problem to fully develop.
2Reliability
If liquid fuel supply is increased to prevent misfire, then cylinder operation reliability is improved, but fuel consumption increases
Solution Approach 1:
Instead of increasing liquid fuel supply to all cylinders uniformly, the control system identifies specific cylinders experiencing abnormal conditions and applies increased fuel supply only to those affected cylinders. This localized approach maintains reliability where needed while minimizing unnecessary fuel consumption in normally operating cylinders.
3Measurement precision
If individual cylinder monitoring is implemented, then misfire detection precision is improved, but system complexity increases
Solution Approach 1:
The control system uses a single cylinder pressure monitoring mechanism that serves multiple functions: detecting combustion gas accumulation, identifying misfire conditions, and triggering appropriate fuel supply adjustments. This multi-functional approach achieves precise individual cylinder monitoring without requiring separate specialized sensors or complex diagnostic systems for each function.
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
The system effectively prevents cylinder misfires by ensuring sufficient liquid fuel injection into affected cylinders, maintaining optimal engine operation and preventing wear, hesitation, or stalling, thus enhancing performance and safety.
Implementation Method 1
a liquid fuel injector configured to inject the liquid fuel into the cylinder
Implementation Method 2
a gaseous fuel admission valve configured to admit the gaseous fuel into the cylinder
Implementation Method 3
a piston configured to reciprocate within the cylinder
Implementation Method 4
combust a liquid fuel and a gaseous fuel
Data Source
AI summary
A control system for a dual fuel engine having a liquid fuel supply and a gaseous fuel supply is disclosed. The control system may include at least one sensor operably coupled to a cylinder of the dual fuel engine and configured to monitor cylinder condition and transmit a cylinder condition signal. Additionally, a controller may be communicably coupled with the at least one sensor and the controller may be configured to receive the cylinder condition signal and determine whether the cylinder is operating in an abnormal operating condition. Whereas the controller determines the cylinder is operating in the abnormal operating condition, the controller sends a control signal for the liquid fuel supply to provide an amount of liquid fuel which is greater than an amount of liquid fuel supplied to the cylinder during a normal operating condition.