Hybrid Engine Dragging for Exhaust Aftertreatment Conditioning
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Solution Overview
Problem
Hybrid vehicles face challenges in maintaining optimal operating states of the internal combustion engine and exhaust gas aftertreatment systems, particularly during engine startups, which can lead to sudden emission increases and violations of emission limit values due to suboptimal catalyst temperatures and nitrogen oxide or ammonia loads.
Innovation Solution
The method delays engine startup and uses the electric motor to drag the internal combustion engine, generating a gas flow for preparatory measures such as heating the exhaust gas aftertreatment system, reducing nitrogen oxide load, and adjusting ammonia levels by injecting fuel or ammonia-cleaving reagents into the exhaust gas line to bring parameters within optimal ranges before engine activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the internal combustion engine is started immediately when a start request occurs, then the vehicle can respond quickly to driving demands, but the exhaust gas aftertreatment system operates suboptimally causing emission limit violations
Solution Approach 1:
The system performs preliminary conditioning of the exhaust gas aftertreatment system before engine startup by dragging the engine with the electric motor to generate exhaust gas flow. This preliminary action ensures the catalyst reaches optimal temperature and nitrogen oxide storage capacity before the engine actually starts, preventing emission violations while maintaining quick response capability.
2Reliability
If the internal combustion engine is dragged by the electric motor to generate gas flow for preparatory measures, then the exhaust gas aftertreatment system efficiency is improved, but additional energy consumption occurs
Solution Approach 1:
The system performs preliminary conditioning of the exhaust gas aftertreatment system before engine startup by dragging the engine with the electric motor to generate exhaust gas flow. This preliminary action ensures the catalyst reaches optimal temperature and nitrogen oxide storage capacity before the engine actually starts, preventing emission violations while maintaining quick response capability.
3Reliability
If the nitrogen oxide storage catalyst is fully loaded with nitrogen oxides, then emission reduction efficiency is maximized, but the catalyst requires frequent regeneration cycles
Solution Approach 1:
The control system continuously monitors the nitrogen oxide storage capacity of the catalyst and uses this feedback information to determine the optimal timing for engine startup and regeneration cycles. By maintaining the catalyst at optimal load levels rather than allowing it to become fully saturated, the system maximizes emission reduction efficiency while extending the time between regeneration cycles.
4Use of energy by moving object
If the SCR catalyst operates at temperatures below 200°C, then energy consumption is reduced, but the nitrogen oxide reduction efficiency drops significantly
Solution Approach 1:
The system uses the electric motor to drag the internal combustion engine and generate exhaust gas flow that passes through the SCR catalyst before the engine actually starts. This preliminary action allows the catalyst to reach optimal operating temperature (above 200°C) in advance, ensuring high nitrogen oxide reduction efficiency when the engine starts, while minimizing the duration and energy consumption of the heating process.
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 prevents sudden emission increases by ensuring the exhaust gas aftertreatment system operates within optimal conditions, maintaining compliance with emission limit values and enhancing overall system efficiency.
Implementation Method 1
the electric motor to drag the internal combustion engine, generating a gas flow for preparatory measures
Implementation Method 2
heating the exhaust gas aftertreatment system
Implementation Method 3
The hydrocarbons of the fuel bring about a desorption of the nitrogen oxides and react with them to form water, nitrogen and carbon dioxide
Implementation Method 4
an SCR catalyst reduces the nitrogen oxides contained in the exhaust gas in the presence of ammonia to form nitrogen
Implementation Method 5
This HWL is stored in a reducing agent tank. However, the SCR reaction usually requires a catalyst temperature of more than 200° C. for a high degree of efficiency
Implementation Method 6
The NSC catalyst stores nitrogen oxides by adsorption on its surface
Data Source
AI summary
A method for operating a hybrid motor vehicle. In one example, the vehicle comprises an internal combustion engine (10) and at least one electric motor (20). As long as at least one parameter of an exhaust gas aftertreatment system (12) of the internal combustion engine (10) lies outside a given range, the starting of the internal combustion engine (10) is delayed and the internal combustion engine (10) is dragged by the electric motor (20). At the same time at least one measure is carried out which changes the parameter.