Exhaust-Gas Burner Lambda Compensation for Catalytic Converter
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Solution Overview
Problem
Existing exhaust-gas aftertreatment systems face challenges in maintaining optimal lambda values for catalytic converters over long periods, leading to potential pollutant release, especially when deviations occur due to varying engine operating conditions or component requirements.
Innovation Solution
A method for operating an exhaust-gas burner that merges its exhaust gases with those from the internal combustion engine, allowing for dynamic adjustment of lambda values to maintain a target lambda of one, even during irregular engine operation, by operating in rich or lean modes as needed, and monitoring catalytic converter fill levels to prevent pollutant emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the internal combustion engine is operated with a deviating lambda value for long periods, then specific functions (particle filter regeneration, diagnostic procedures, catalytic converter heating) can be performed, but pollutants are released into the environment
Solution Approach 1:
The exhaust gas flow is segmented into two separate streams: one from the internal combustion engine and another from the exhaust-gas burner. This allows independent control of lambda values for each stream, enabling the engine to operate in non-stoichiometric modes for specific functions while the burner compensates to maintain stoichiometric mixed exhaust gas for environmental compliance
Solution Approach 2:
The exhaust-gas burner acts as an intermediary device that introduces additional exhaust gas with a compensating lambda value. This intermediary stream balances the overall lambda value of the mixed exhaust gas, allowing the engine to deviate from stoichiometric operation without causing pollutant release
2Adaptability or versatility
If the lambda value of the internal combustion engine is adjusted for specific functions, then those functions can be performed, but the lambda value for optimal catalytic converter operation is compromised
Solution Approach 1:
The exhaust gas system is divided into two independently controllable streams, allowing the engine exhaust to serve specific functions while the burner exhaust ensures optimal lambda conditions for the catalytic converter
Solution Approach 2:
The lambda value parameter is independently adjusted for the exhaust-gas burner based on the engine's operating mode and the desired target lambda value, enabling dynamic compensation to maintain optimal catalytic converter operation regardless of engine requirements
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 consistent and low pollutant concentrations downstream of catalytic converters, optimizing their operation and preventing undesired emissions by coordinating exhaust gas flows and adjusting lambda values in real-time.
Implementation Method 1
an air-fuel mixture is fed to an exhaust-gas burner, in whose combustion chamber an ignition takes place
Implementation Method 2
catalytic converters which chemically convert particular exhaust-gas components
Implementation Method 3
catalytic converters which chemically convert particular exhaust-gas components, for example carbon monoxide, hydrocarbons
Data Source
AI summary
A method for operating an exhaust-gas burner (B) of a vehicle (100) which has at least an internal combustion engine (V) and a catalytic converter (C1, C2), wherein exhaust gases (22, 24) of the exhaust-gas burner (B) are merged, upstream of the catalytic converter (C1, C2), with exhaust gases (12) of the internal combustion engine (V), forming an exhaust-gas mixture, wherein a lambda value of the exhaust gases (22, 24) of the exhaust-gas burner (B) is set in a manner dependent on a lambda value of the exhaust gases (12) of the internal combustion engine (V).