Engine Control System Fuel Reactivity Compensation
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Solution Overview
Problem
Dual fuel engines face challenges in calibrating performance due to varying fuel quality, leading to issues like high turbine inlet temperatures, detonation, and NOx emissions out of compliance, as conventional calibration methods require extensive flash files and real-time fuel quality information, which may not be readily available.
Innovation Solution
An engine control system using a NOx sensor to generate a NOx error value, which is used to adjust pilot fuel quantity and air-to-fuel ratio through closed-loop control, allowing for real-time fuel reactivity compensation and maintaining optimal exhaust temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple flash files with separate performance calibration adjustments are used to cover different fuel qualities, then engine calibration accuracy is improved, but device complexity and time consumption increase
Solution Approach 1:
The patent changes the approach from using multiple discrete calibration files for different fuel qualities to a continuous parameter-based system. The system now uses real-time measurements of fuel properties (cetane index, density, viscosity) as input parameters to dynamically calculate optimal injection timing and quantity, eliminating the need for multiple pre-programmed flash files while maintaining calibration accuracy across varying fuel qualities
Solution Approach 2:
The system performs self-calibration by automatically measuring fuel properties during operation and adjusting injection parameters accordingly. The control unit continuously monitors fuel characteristics and adapts the injection strategy without requiring external intervention or manual selection of calibration files, enabling the system to serve itself across different fuel quality conditions
2Manufacturing precision
If fuel quality information is requested from supplier or tested upon arrival, then calibration accuracy is improved, but time consumption and operational complexity increase
Solution Approach 1:
The system performs preliminary measurement of fuel properties immediately upon fuel introduction into the system, before combustion begins. By measuring cetane index, density, and viscosity in real-time at the point of use, the system eliminates the need for advance fuel quality assessment or waiting for supplier information, enabling immediate accurate calibration
Solution Approach 2:
The patent replaces manual or laboratory-based fuel quality testing with automated sensor-based measurement systems integrated into the engine control unit. Optical sensors, density meters, and viscosity sensors provide real-time data directly to the control algorithm, substituting complex external testing procedures with streamlined electronic measurement and calculation
3Manufacturing precision
If flash files are created through hand tuning and official IMO measurement, then calibration accuracy is improved, but time consumption and operational flexibility decrease
Solution Approach 1:
The system implements continuous feedback loops where actual combustion parameters (exhaust temperature, cylinder pressure, NOx emissions) are measured and compared against target values. The control unit automatically adjusts injection timing and quantity based on this feedback, enabling real-time optimization without requiring time-consuming hand-tuning sessions or official IMO measurement procedures for each fuel type
Solution Approach 2:
The patent transitions from static calibration files created through lengthy hand-tuning processes to a dynamic system that continuously adapts injection parameters based on real-time fuel property measurements and combustion feedback. The control algorithm dynamically calculates optimal settings moment-by-moment, eliminating the need for time-intensive creation of separate calibration files for different operating conditions
4Ease of operation
If engine is not calibrated according to specific fuel quality, then operational simplicity is maintained, but harmful emissions and performance issues increase
Solution Approach 1:
The system automatically measures fuel properties and adjusts injection parameters without requiring operator intervention for calibration selection. The control unit serves itself by continuously monitoring fuel quality and adapting combustion parameters, maintaining operational simplicity while preventing harmful emissions through automatic real-time calibration
Solution Approach 2:
The system uses feedback from exhaust gas analysis (NOx sensors, oxygen sensors) and combustion monitoring to automatically adjust injection parameters. This closed-loop control ensures emissions compliance and optimal performance are maintained automatically based on actual fuel quality, without requiring manual calibration changes or operator expertise in fuel specification
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 enables simultaneous control of NOx and exhaust temperature, optimizing combustion and reducing the need for multiple calibration files, thereby ensuring engine performance and compliance across varying fuel qualities without requiring continuous recalibration.
Implementation Method 1
a nitrous oxide (NOx) sensor configured to sense NOx generated from operation of the dual fuel engine
Implementation Method 2
controlling pilot fuel quantity supplied to an engine using a nitrous oxide (NOx) error; and controlling air-to-fuel ratio (AFR) for the engine using the NOx error
Data Source
AI summary
A system, apparatus, and method for controlling an engine system can provide fuel reactivity compensation control for an engine of the engine system. Pilot fuel quantity supplied to the engine can be controlled using a nitrous oxide (NOx) error. Likewise, air-to-fuel ratio (AFR) for the engine can be controlled using the NOx error. Each of a pilot fuel offset and an AFR control trim can be generated using the NOx error. The pilot fuel offset and the AFR control trim can be used to control the pilot fuel quantity and the AFR, respectively.