Engine Emission Measurement via Exhaust Gas Analysis
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Solution Overview
Problem
Current methods struggle to reliably and efficiently measure nitrogen oxide emissions from internal combustion engines in real-time and under realistic conditions, especially during field operations, due to difficulties in determining instantaneous power output and fuel consumption without complex modifications.
Innovation Solution
A method and device that calculate specific nitrogen oxide emissions by determining the emission mass flow and engine power output from easily measurable quantities, using a quotient of the two, and applying weighting factors based on engine load conditions, allowing for real-time, on-site compliance verification without costly alterations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct on-site measurement of operating parameters (power output, fuel consumption) is performed, then measurement reliability is improved, but device complexity and cost increase due to complicated alterations or modifications of the machine
Solution Approach 1:
The patent uses exhaust gas components (O2, CO, CO2, HC) as intermediary measurements to indirectly determine fuel consumption and power output. Instead of directly measuring these difficult-to-obtain parameters, the system measures easily accessible exhaust gas composition and uses stoichiometric relationships to calculate the desired operating parameters, thereby achieving reliable measurements without complex modifications
Solution Approach 2:
The patent replaces direct mechanical/instrumental measurement systems for power output and fuel consumption with a chemical analysis approach. By substituting physical measurement devices with exhaust gas composition analysis and stoichiometric calculations, the system achieves the same measurement objectives with simpler, more versatile equipment that can be deployed on-site without major machine modifications
2Measurement precision
If stationary measuring devices are used on test stands, then measurement precision is improved, but ease of operation deteriorates due to inability to perform on-site measurements
Solution Approach 1:
The patent creates a universal measuring system that can operate in multiple locations (test stands and on-site field conditions) using the same equipment configuration. The system measures exhaust gas components and calculates operating parameters through standardized procedures, eliminating the need for different measurement systems for different locations and enabling easy deployment anywhere the engine operates
Solution Approach 2:
The system enables on-site self-measurement capabilities where the engine operator can directly measure and evaluate their own emissions performance without requiring access to specialized test stand facilities. The portable equipment and simplified calculation methods allow the system to serve itself by providing all necessary measurement and computation functions in the field
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 reliable, real-time monitoring of exhaust gas performance figures, facilitating compliance with emission limits across various engines and locations, optimizing combustion processes and reducing measurement complexity.
Implementation Method 1
an exhaust gas analyzer for determining the volume fractions of the exhaust gas components O2, CO, CO2, NOx, SOx and/or HC
Implementation Method 2
a cooling unit for cooling the exhaust gas and condensing water vapor in the exhaust gas
Implementation Method 3
a separator for separating liquid water from the exhaust gas
Data Source
AI summary
The invention relates to a method and a device for determining specific emissions as an exhaust gas characteristic of an internal combustion engine. Said method is characterized in that the exhaust gas mass flow (3) is determined as the first operating parameter and the engine power output (2) as the second operating parameter, the nitrous oxide mass flow (3) and the engine power output (2) are derived from a respective measured value that deviates from the operating parameter and the exhaust gas characteristic is calculated as a quotient from the corrected exhaust gas mass flow (3) and the engine power output (2).