Combustion Gas Composition Determination Using NOx and Temperature
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Solution Overview
Problem
Internal combustion engines face challenges in efficiently and flexibly providing clean energy due to varying fuel qualities, such as natural gas, biogas, and synthesis gas, leading to inefficiencies and emission issues without real-time gas composition recognition.
Innovation Solution
A method for determining combustion gas composition using simple measurement variables like nitrogen oxide emission, exhaust gas temperature, and combustion air ratio, allowing for engine operating parameter adjustments without complex additional measurement technology, applicable to all four-stroke combustion gas internal combustion engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas chromatography or complex measurement technology is used to determine combustion gas composition, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential measurement variables needed for combustion gas composition determination from complex gas analysis. Instead of using full gas chromatography, it selectively measures key parameters (NOx emission, exhaust gas temperature, combustion air ratio) that sufficiently characterize the combustion gas composition, thereby simplifying the measurement system while maintaining adequate precision
Solution Approach 2:
The patent creates a simplified model or copy of the combustion gas composition determination process. Rather than directly analyzing the full gas composition with complex equipment, it uses a reduced set of measurable parameters that correlate with the gas composition, effectively creating a simplified representation that achieves the same control objective with less complexity
2Productivity
If engine operating parameters are adapted based on real-time combustion gas composition recognition, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback control system where measured parameters (NOx emission, exhaust gas temperature, combustion air ratio) are continuously monitored and used to adjust engine operating parameters in real-time. This feedback loop enables the engine to adapt to varying combustion gas qualities (natural gas, biogas, synthesis gas) and maintain optimal efficiency without requiring complex additional measurement technology
Solution Approach 2:
The control system is designed to handle multiple fuel types and combustion gas compositions using the same measurement and control approach. The system universally adapts to different gas qualities by interpreting the relationship between the measured parameters and gas composition, eliminating the need for fuel-specific measurement systems or complex adaptations
Data Source
AI summary
A method for determining a combustion gas composition of a combustion gas for an internal combustion engine includes operating the engine, and establishing an operating point of the internal combustion engine during operation. The method also includes detecting a nitrogen oxide emission of the internal combustion engine at the operating point. The method further includes detecting an exhaust gas temperature of the internal combustion engine at the operating point, and detecting a combustion air ratio of the internal combustion engine at the operating point. The combustion gas composition of the combustion gas is determined based on the operating point, the detected nitrogen oxide emission, the detected exhaust gas temperature and the detected combustion air ratio.