Engine Methane Number Estimation Using Heat Release Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for determining methane number in gaseous fuels for internal combustion engines are cumbersome and inaccurate, especially when fuel blends change, and may not account for real-time adjustments needed to maintain optimal engine performance.
Innovation Solution
A system and method that utilizes sensors to measure heat release and pressure signals to estimate methane number, adjusting for factors like humidity and air temperature, and provides real-time notifications and controls to optimize combustion timing and fuel blending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sampling methods are used to determine methane number, then advance knowledge of fuel properties is obtained, but the process becomes cumbersome and requires manual intervention
Solution Approach 1:
The system enables self-service by automatically determining methane number through real-time monitoring of combustion characteristics. The controller continuously calculates methane number based on sensor data from the engine operation itself, eliminating the need for separate manual sampling and laboratory analysis processes.
Solution Approach 2:
The patent replaces mechanical sampling procedures with an electronic sensing and calculation system. Instead of physically collecting fuel samples and analyzing them offline, the system uses sensors to detect combustion parameters and computationally determines methane number in real-time, substituting mechanical operations with electronic automation.
2Loss of information
If methane number is determined through traditional sampling, then fuel blend composition is known in advance, but real-time changes due to active blending are not accounted for
Solution Approach 1:
The system implements feedback by continuously monitoring combustion characteristics and updating methane number calculations in real-time. As fuel composition changes during active blending, the combustion characteristics change accordingly, and the controller detects these changes and recalculates methane number, providing continuous feedback on the actual fuel being combusted.
Solution Approach 2:
The system performs preliminary action by using real-time combustion data to predict and account for fuel composition changes before they significantly impact engine performance. The continuous monitoring allows the system to anticipate fuel blend variations and adjust parameters proactively rather than reactively.
3Productivity
If excess air detection is used to calculate methane number, then calculations can be performed, but accuracy is compromised when excess air is not present or when engine compensation affects detected excess air
Solution Approach 1:
The patent changes the parameters used for methane number calculation from excess air detection to direct combustion characteristic measurements. Instead of relying on lambda sensor data that may be affected by engine compensation strategies, the system uses alternative combustion parameters such as pressure rise rate, heat release rate, or ignition delay that are directly influenced by fuel properties and remain accurate under various operating conditions.
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
Enables accurate and dynamic estimation of methane number, allowing for real-time adjustments to maintain optimal engine performance without prior knowledge of fuel constituents, improving engine efficiency and reliability.
Implementation Method 1
a sensor configured to generate a signal indicative of a heat release of fuel combusted with an internal combustion engine
Implementation Method 2
a pressure sensor configured to generate a pressure signal indicative of pressure within one or more of the engine cylinders
Data Source
AI summary
A system for estimating methane number of fuel includes a sensor configured to generate a signal indicative of a heat release of fuel combusted with an internal combustion engine and a controller. The controller is configured to receive the signal from the sensor, determine a methane number of fuel supplied to the internal combustion engine based on the signal from the sensor, and output a notification based on the methane number.