Particulate Filter Regeneration Using Cylinder Deactivation Control
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Solution Overview
Problem
Particulate filters in engine exhaust systems face damage risks during regeneration due to thermal runaway and increased fuel consumption from high temperatures, necessitating effective temperature control and oxygen management.
Innovation Solution
Implementing a cylinder deactivation mode (CDA) to manage exhaust gas temperature and oxygen levels during particulate filter regeneration, using thermal management strategies like post-injection and external hydrocarbon dosing to prevent thermal runaway and minimize fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If regeneration is performed to burn particulate matter from the filter, then the filter is unclogged and flow is improved, but elevated temperatures cause damage to various components
Solution Approach 1:
The system dynamically adjusts engine operating parameters including cylinder deactivation strategies and fuel injection timing to control exhaust temperature during regeneration, allowing the system to adapt between different thermal states to achieve regeneration while preventing component damage
Solution Approach 2:
The system changes physical parameters such as exhaust gas temperature, oxygen concentration, and cylinder firing patterns to enable controlled combustion of particulate matter while maintaining temperatures below damage thresholds for surrounding components
2Reliability
If high temperatures are used for regeneration, then particulate matter is effectively burned, but fuel consumption increases
Solution Approach 1:
The system uses the engine's own exhaust gases and existing thermal energy to drive the regeneration process, rather than requiring external fuel addition, thereby achieving regeneration while minimizing additional fuel consumption
Solution Approach 2:
The system employs periodic cylinder deactivation and reactive oxygen species generation at controlled intervals to maintain regeneration effectiveness while reducing overall fuel consumption compared to continuous high-temperature operation
3Object-affected harmful factors
If cylinder deactivation is used to control temperature, then thermal damage is reduced, but oxygen levels may become insufficient for regeneration
Solution Approach 1:
The system creates localized zones of different oxygen concentration and temperature within the exhaust stream, using selective cylinder deactivation to maintain oxygen-rich regions for regeneration while other regions remain cooler to prevent thermal damage
Solution Approach 2:
The system introduces reactive oxygen species as an intermediary that enables combustion of particulate matter at lower temperatures, allowing regeneration to proceed without requiring high oxygen concentrations that would necessitate full cylinder operation
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
CDA mode effectively controls temperature and oxygen levels, reducing the risk of filter damage and fuel consumption during regeneration, ensuring efficient and safe particulate filter operation.
Implementation Method 1
Implementing a cylinder deactivation mode (CDA) to manage exhaust gas temperature and oxygen levels during particulate filter regeneration, using thermal management strategies like post-injection and external hydrocarbon dosing to prevent thermal runaway
Implementation Method 2
using thermal management strategies like post-injection and external hydrocarbon dosing to prevent thermal runaway
Data Source
AI summary
A system includes an exhaust aftertreatment system including a particulate filter and a controller. The controller is configured to: receive information comprising a temperature regarding a filter of the aftertreatment system; and responsive to determining that the temperature regarding the filter is below a temperature threshold, command the engine to operate according to a first firing fraction. The first firing fraction may define a number of active cylinders of the engine relative to a total number of cylinders of the engine, and correspond to a predetermined temperature value of the filter.