Dual Fuel Engine Control via In-Cylinder Pressure Feedback
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Solution Overview
Problem
Dual fuel engine systems face challenges in maintaining consistent performance between liquid fuel mode and mixed liquid and gaseous fuel mode due to differences in combustion characteristics and emissions, leading to performance errors and operator dissatisfaction.
Innovation Solution
A dual fuel engine system with an electronic control unit that adjusts fuel delivery parameters based on real-time data from a sensing mechanism, ensuring equivalent performance in both modes by varying the stored control values for fuel delivery, thereby minimizing performance errors between liquid fuel and mixed liquid and gaseous fuel modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the engine operates in mixed liquid and gaseous fuel mode, then emissions properties are improved, but combustion stability deteriorates
Solution Approach 1:
The control system continuously monitors engine operating parameters and adjusts the gaseous fuel delivery rate based on feedback from engine power output measurements. This closed-loop control ensures combustion stability is maintained while operating in mixed fuel mode with improved emissions characteristics.
Solution Approach 2:
The system dynamically adjusts the gaseous fuel delivery rate parameter based on engine operating conditions. By varying this parameter in real-time, the system maintains optimal combustion stability across different loads while preserving the emissions benefits of gaseous fuel operation.
2Reliability
If the engine operates in liquid fuel mode, then combustion stability is maintained, but emissions properties deteriorate
Solution Approach 1:
The system dynamically transitions between liquid fuel only mode and mixed fuel mode based on operating conditions. This dynamic operation allows the engine to maintain combustion stability when using liquid fuel while capturing emissions benefits when operating in mixed mode, optimizing both parameters across the operating range.
3Object-generated harmful factors
If gaseous fuel delivery rate is increased, then emissions are reduced, but engine power output decreases
Solution Approach 1:
The control system uses feedback from engine power output measurements to adjust the gaseous fuel delivery rate. This ensures that emissions are reduced through increased gaseous fuel usage while preventing excessive power loss by maintaining power output within acceptable ranges.
Solution Approach 2:
The system adjusts the gaseous fuel delivery rate parameter in response to changing engine load conditions. At higher loads where power output is more critical, the gaseous fuel ratio is optimized to balance emissions reduction with power maintenance, while at lower loads emissions reduction can be prioritized.
4Object-generated harmful factors
If fuel delivery parameters are adjusted for mixed mode operation, then emissions improve, but performance consistency between modes deteriorates
Solution Approach 1:
The control system continuously monitors engine power output and uses this feedback to adjust fuel delivery parameters in real-time. This ensures that performance consistency between liquid fuel mode and mixed fuel mode is maintained, while still achieving emissions improvements through optimized gaseous fuel delivery.
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 achieves transparent transitions between fuel modes, ensuring consistent engine power output and reducing performance errors, making the engine operation indistinguishable to the operator regardless of the fueling strategy, thereby enhancing operational efficiency and user experience.
Implementation Method 1
combustion of the liquid fuel within the cylinder
Data Source
AI summary
A dual fuel engine system, such as for diesel and natural gas operation, includes a control system having an electronic control unit structured to vary a stored control valve for a fuel delivery parameter, responsive to engine power output. The engine power output can be determined by in-cylinder pressure monitoring during a liquid fuel mode. The stored control value can be a dynamically updated value in an engine fueling map.