Engine Controller Emission Model Adjustment
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Solution Overview
Problem
Maintaining low levels of contaminants like NOx, CO, and HC in the exhaust gas stream from internal combustion engines operating at stoichiometric conditions is challenging, especially as the engine and catalyst age, and ensuring compliance with emission regulations in various regions is difficult, particularly in mobile applications.
Innovation Solution
A system and method that utilize an engine controller with processor-executable routines to determine pre- and post-catalyst emission levels using engine and catalyst models, adjust engine operating parameters, and compare these levels with threshold values to maintain emissions below regulatory limits, employing a three-way catalyst and exhaust gas recirculation to minimize contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the IC engine operates at stoichiometric condition with three-way catalyst and EGR, then contaminant levels are minimized, but maintaining consistent low emission levels becomes challenging as the engine and catalyst age
Solution Approach 1:
The system performs preliminary determination of pre-catalyst emission levels using a combustion engine model before the exhaust reaches the catalyst. This allows proactive adjustment of engine operating parameters to compensate for anticipated catalyst aging effects, maintaining consistent emission control throughout the catalyst's service life.
Solution Approach 2:
The system implements a feedback mechanism by determining post-catalyst emission levels using a three-way catalyst model, comparing these with target emission levels, and adjusting engine operating parameters accordingly. This closed-loop control ensures consistent emission performance even as the catalyst ages.
2Adaptability or versatility
If the IC engine is employed in mobile applications, then versatility and adaptability are improved, but maintaining emission levels below regulatory limits becomes more difficult due to varying operating conditions
Solution Approach 1:
The system dynamically adjusts engine operating parameters based on real-time determination of pre- and post-catalyst emission levels. This dynamic control adapts to varying mobile application operating conditions while maintaining emission compliance across different regions and usage scenarios.
Solution Approach 2:
The system changes engine operating parameters (such as air-fuel ratio, injection timing, EGR rate) based on determined emission levels and regional regulatory requirements. This allows the engine to maintain compliance with different emission standards across various mobile applications and geographic regions.
3Measurement precision
If complex models and real-time adjustments are implemented, then emission control precision is improved, but device complexity increases
Solution Approach 1:
The engine controller performs multiple functions: determining pre-catalyst emission levels using a combustion engine model, determining post-catalyst emission levels using a three-way catalyst model, comparing with target levels, and adjusting operating parameters. This multi-functionality in a single device achieves precise emission control without requiring separate specialized systems.
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
Effectively maintains emission levels within regulatory limits, ensuring environmental compliance and efficient operation of internal combustion engines, even as they age, by dynamically adjusting engine parameters based on real-time emission data and regional regulations.
Implementation Method 1
The three-way catalyst causes chemical reactions such as, but not limited to, oxidation and reduction, to treat the gas stream in order to minimize the levels of the contaminants
Implementation Method 2
The three-way catalyst causes chemical reactions such as, but not limited to, oxidation and reduction, to treat the gas stream in order to minimize the levels of the contaminants
Implementation Method 3
The three-way catalyst causes chemical reactions such as, but not limited to, oxidation and reduction, to treat the gas stream in order to minimize the levels of the contaminants
Data Source
AI summary
A method for controlling an emission amount in an exhaust gas stream emitted from a power generation system is presented. The method includes determining a pre-catalyst emission level using a combustion engine model. The method further includes determining a post-catalyst emission level using a three-way catalyst model based on the pre-catalyst emission level. Furthermore, the method includes determining an adjusted post-catalyst emission level based on the post-catalyst emission level. Moreover, the method includes determining a difference between the post-catalyst emission level and the adjusted post-catalyst emission level and comparing the difference with a threshold value. Additionally, the method includes determining whether to adjust an actual value of an engine operating parameter based on the comparison such that the emission amount in the exhaust gas stream is maintained below an emission regulatory limit. An engine controller and a power generation system employing the method are also presented.