High Pressure Gas Injection Engine Control for Excess Fuel Combustion
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Solution Overview
Problem
High pressure gas injection internal combustion engines face challenges in efficiently combusting excess gaseous fuel, leading to significant unburned hydrocarbon emissions and environmental disturbances, particularly with methane, which contributes to global warming.
Innovation Solution
A method that shifts from a first combustion mode to a second mode by determining air and fuel flow parameters to achieve a controlled premix of air and excess gaseous fuel, allowing for complete combustion of excess fuel, with the excess fuel being accumulated and injected at a lower pressure to facilitate premixed flame propagation, thereby minimizing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If excess gaseous fuel is vented to atmosphere, then pressure relief is achieved, but environmental emissions increase
Solution Approach 1:
The patent converts the harmful excess gaseous fuel that would be vented into a useful resource by injecting it into the combustion chamber where it is burned to produce useful work, thereby eliminating emissions while maintaining pressure relief
Solution Approach 2:
The patent changes the state of the excess gaseous fuel from a waste product to a combustible resource by controlling injection parameters (timing, pressure, quantity) to achieve complete combustion and convert the fuel into energy
2Use of energy by moving object
If captured fuel is reintroduced before air intake compressor, then fuel utilization is improved, but combustion completeness deteriorates
Solution Approach 1:
The patent performs preliminary mixing of the captured gaseous fuel with air in the combustion chamber before compression and ignition, ensuring proper fuel-air mixture ratios that enable complete combustion and maximize energy utilization
Solution Approach 2:
The patent uses feedback control by monitoring combustion conditions and adjusting the quantity and timing of excess fuel injection to maintain optimal combustion completeness and minimize uncombusted fuel emissions
3Ease of operation
If excess gaseous fuel is supplied without control, then pressure management is simplified, but combustion efficiency deteriorates
Solution Approach 1:
The patent implements feedback control by continuously monitoring combustion chamber conditions and dynamically adjusting the excess fuel injection rate to maintain optimal combustion efficiency while automatically managing pressure balance in the fuel system
Solution Approach 2:
The patent uses dynamic injection control where the quantity and timing of excess fuel injection are continuously adjusted based on real-time engine operating conditions, enabling both efficient combustion and adaptive pressure management
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 ensures that as little as 2-5% of excess gaseous fuel remains uncombusted, significantly reducing environmental disturbances and increasing the useful work from excess fuel, while maintaining efficient engine operation even at low loads without a throttle.
Implementation Method 1
supplying from the container, in accordance with the determined fuel flow related parameter value, the excess gaseous fuel to provide a premix of air and the excess gaseous fuel to the cylinder
Data Source
AI summary
A method of controlling a high pressure gas injection internal combustion engine includes injecting, in a first combustion mode, by a first as injection system, a first gaseous fuel into a cylinder of the engine, and accumulating in a container of a second gas injection system excess gaseous fuel from the first fuel system, shifting, in the cylinder, from the first combustion mode to a second combustion mode including determining a value of an air flow related parameter indicative of an air mass flow into the cylinder, determining, based on the determined air flow related parameter value, a value of a fuel flow related parameter indicative of a mass flow of the excess gaseous fuel, and supplying from the container, in accordance with the determined fuel flow related parameter value, the excess gaseous fuel to provide a premix of air and the excess gaseous fuel to the cylinder.