Particulate Filter Regeneration with Zone-Specific Temperature Control
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Solution Overview
Problem
Current methods for regenerating particulate filters in internal combustion engines fail to ensure uniform temperature distribution, leading to soot accumulation in edge areas, increased exhaust gas counter-pressure, and risk of uncontrolled burn-off and thermal damage, due to assumptions of uniform temperature and loading across the filter.
Innovation Solution
A method that divides the particulate filter into zones, determining loading and temperature separately for each zone, and raises the temperature to ensure all zones reach the regeneration temperature for soot oxidation, using a sensor system or loading model to monitor and control the regeneration process, thereby preventing soot accumulation and minimizing thermal damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the temperature is raised uniformly across the particulate filter to ensure complete soot oxidation, then the regeneration completeness is improved, but the fuel consumption increases and thermal damage risk increases
Solution Approach 1:
The control unit divides the particulate filter into multiple zones (e.g., inner zone and outer zone) and determines the loading state separately for each zone. This segmentation allows targeted regeneration approaches that address the specific needs of each zone rather than applying a uniform temperature increase across the entire filter.
Solution Approach 2:
The patent applies different regeneration strategies to different zones based on their specific loading states and temperature distributions. The outer zone, which experiences greater heat losses and lower temperatures, receives different treatment compared to the inner zone. This local quality approach ensures that each zone reaches the necessary temperature for soot oxidation without unnecessarily heating the entire filter to excessive temperatures.
2Reliability
If the temperature is raised to ensure soot oxidation in edge areas, then the soot accumulation is reduced, but the risk of uncontrolled burn-off and thermal damage increases
Solution Approach 1:
The control unit continuously monitors the loading state of different zones in the particulate filter and uses this feedback information to adjust the regeneration temperature profile. By detecting the actual loading conditions in each zone, the system can apply the minimum necessary temperature increase to achieve complete soot oxidation, avoiding excessive temperatures that would cause thermal damage.
Solution Approach 2:
The control unit determines the loading state of different zones before initiating regeneration and uses this advance information to plan the temperature profile. This preliminary assessment allows the system to prepare an optimized regeneration strategy that prevents uncontrolled burn-off by avoiding sudden excessive temperature increases.
3Stability of the object's composition
If the particulate filter is divided into zones with separate loading determination, then the temperature distribution uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent uses a single loading model or sensor system that can determine the loading state of multiple zones simultaneously. This multi-functional approach allows the system to monitor and control temperature distribution across different zones without requiring separate physical devices for each zone, thereby reducing the actual device complexity while achieving uniform temperature distribution.
4Ease of operation
If a uniform temperature assumption is used for regeneration control, then the control simplicity is maintained, but the regeneration effectiveness deteriorates due to edge area soot accumulation
Solution Approach 1:
The control unit segments the particulate filter into multiple zones and determines the loading state for each zone separately. This segmentation enables the system to account for the non-uniform temperature distribution (with cooler edge areas) and adjust the regeneration strategy accordingly, improving regeneration effectiveness while maintaining reasonable control complexity through software-based zone management.
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 complete regeneration of the particulate filter, maintains low exhaust gas counter-pressure, reduces fuel consumption, and prevents thermal damage by ensuring all zones reach the necessary temperature for soot oxidation, even in non-uniform loading conditions.
Implementation Method 1
determining a loading state of the particulate filter by means of a loading model or by means of sensor system
Implementation Method 2
the temperature is raised to such an extent that the temperature in all of the zones of the particulate filter is above the regeneration temperature needed for oxidizing the soot that has been retained in the particulate filter
Implementation Method 3
The temperature decreases towards the edge areas because of the wall heat losses and the slower flow rate
Data Source
AI summary
The invention relates to a method for regenerating a particulate filter in the exhaust gas channel of an internal combustion engine. Here, the particulate filter is divided into several zones for determining the loading state, and, at the same time, a temperature distribution over the cross section of the particulate filter is determined. In order to prevent the soot retained in the edge zones of in the particulate filter from being insufficiently oxidized, when it is ascertained that the edge zones have been sufficiently loaded, the exhaust gas temperature is raised to a temperature which, in spite of the heat losses in the edge areas, lies above the temperature at which oxidation of the soot particles can take place. The invention further relates to an internal combustion engine having an exhaust gas channel and a particulate filter arranged in the exhaust gas channel, said internal combustion engine being configured to carry out such a method.