Dual-Fueled Spark Ignition Engine Ammonia Combustion Control
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Solution Overview
Problem
Current internal combustion engines face challenges in achieving stoichiometric operation across a wide range of engine loads and RPM with ammonia as a fuel, particularly at low engine loads where combustibility is incomplete, leading to performance issues.
Innovation Solution
A dual-fueled spark ignition engine system that controls the ratio of ammonia to combustion promoter through an electronic control module, ensuring stoichiometric combustion by adjusting the flow rates of both fuels to maintain optimal balance between power and efficiency, allowing for seamless transitions across varying engine loads and operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If ammonia is used as fuel in spark ignition engines, then harmful emissions are reduced and fuel availability is increased, but combustibility is incomplete at low engine loads leading to performance issues
Solution Approach 1:
A combustion promoter (hydrocarbon fuel) is introduced as an intermediary substance to facilitate complete combustion of ammonia at low engine loads. The combustion promoter acts as a mediator that enables the ammonia-air mixture to burn completely by providing easier ignition and more stable combustion characteristics, thereby resolving the incomplete combustibility issue while maintaining ammonia's emission reduction benefits
Solution Approach 2:
The system dynamically adjusts the ratio of ammonia to combustion promoter based on engine load conditions. At low loads, a higher proportion of combustion promoter is used to ensure complete combustibility, while at high loads, the ratio shifts to maximize ammonia utilization. This parameter adjustment resolves the contradiction by adapting the fuel mixture composition to specific operating conditions
2Productivity
If the ratio of ammonia to combustion promoter is adjusted dynamically, then stoichiometric combustion is maintained across varying loads, but device complexity increases due to additional control systems
Solution Approach 1:
The electronic control module continuously monitors engine operating parameters (load, RPM, air intake) and adjusts the ammonia-to-combustion promoter ratio in real-time to maintain stoichiometric combustion. This feedback mechanism automatically maintains optimal combustion conditions without requiring complex manual intervention or overly sophisticated control systems
Solution Approach 2:
The electronic control module performs multiple functions: it manages the dual-fuel injection timing, adjusts the fuel ratio based on load conditions, and maintains stoichiometric combustion across the entire operating range. By consolidating these functions into a single control unit, the system achieves high productivity without proportionally increasing device complexity
3Power
If compression ratio is increased for higher power output, then engine efficiency improves, but knock occurs more frequently with ammonia fuel
Solution Approach 1:
The combustion promoter serves as an intermediary that enables higher compression ratios to be used with ammonia fuel. By providing easier ignition and more controlled combustion characteristics, the combustion promoter allows the engine to operate at higher compression ratios without experiencing knock, thereby resolving the contradiction between power output and knock prevention
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 enables knock-free operation at higher compression ratios and loads, improving engine efficiency and reducing harmful emissions by maintaining stoichiometric operation throughout the entire engine load range, resulting in increased power and reduced fuel consumption.
Implementation Method 1
combustion chamber for each cycle of the internal combustion engine
Implementation Method 2
dual fueled spark ignition engine
Data Source
AI summary
Described herein are various embodiments of an apparatus, system and method for operating a dual fueled spark ignition engine. For example, according to one illustrative embodiment, a method for operating a dual fueled spark ignition engine includes fueling the engine solely with a combustion promoter within a first engine load range between zero and an engine load associated with a target combustion condition selected from the group consisting of rough limit, knock limit, and any of various conditions between the rough limit and knock limit. Within the first engine load range, the amount of combustion promoter fueling the engine increases as the load increases. The method further includes fueling the engine on a mixture of ammonia and the combustion promoter within a second engine load range between the engine load associated with the selected target combustion condition and the engine load associated with a maximum operating pressure of the engine. Within the second engine load range, the amount of ammonia fueling the engine increases and the amount of combustion promoter fueling the engine remains substantially constant as the load increases.