Particulate Filter Regeneration via Engine Spinning
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Solution Overview
Problem
Turbocharged direct-injection engines face challenges in particulate filter regeneration due to increased soot generation, particularly at high speeds and loads, which can lead to elevated NOx emissions when attempting to introduce excess oxygen for regeneration, and existing methods struggle to maintain emission control while regenerating the filter.
Innovation Solution
The method involves controlling particulate filter regeneration by adjusting oxygen levels during and after engine shutdown, using the energy conversion device to spin the engine and direct excess oxygen to the filter, while maintaining vehicle motion and optimizing regeneration techniques for current conditions to reduce emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excess oxygen is introduced to the particulate filter for regeneration, then the filter can be regenerated effectively, but NOx emissions increase
Solution Approach 1:
The system dynamically switches between different operational modes (engine running with stoichiometric control vs. engine shutdown with excess oxygen) to regulate oxygen levels at the particulate filter, thereby enabling regeneration while preventing excessive NOx formation through real-time condition-based adjustment
Solution Approach 2:
The system performs regeneration in periodic cycles during engine shutdown conditions rather than continuously, allowing the engine to return to stoichiometric operation during running phases to minimize NOx emissions while still achieving necessary filter regeneration during controlled shutdown periods
2Power
If the engine operates at high speed and high loads, then power output is improved, but soot generation increases
Solution Approach 1:
The system converts the harmful soot generated during high-power operation into a controlled regeneration process by capturing it in the particulate filter and subsequently burning it off during engine shutdown conditions, thereby transforming the pollutant into a manageable byproduct that occurs outside of emission-sensitive operating phases
3Object-generated harmful factors
If the engine is shut down for regeneration, then emissions are reduced, but vehicle motion control is lost
Solution Approach 1:
The energy conversion device serves multiple functions: it maintains vehicle motion during engine shutdown, controls engine spinning speed to regulate oxygen flow to the filter, and enables regeneration to occur without compromising propulsion, thereby integrating emission control with vehicle operation rather than treating them as separate functions
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 allows for effective particulate filter regeneration with reduced disturbance to combustion exhaust emissions and lower NOx emissions by carefully managing oxygen levels and regeneration timing, ensuring efficient emission control.
Implementation Method 1
increasing excess oxygen to the particulate filter by spinning the engine with the energy conversion device
Implementation Method 2
regenerating the particulate filter
Data Source
AI summary
Systems and methods for controlling regeneration of a particulate filter downstream of an engine coupled to an energy conversion device are provided herein. One exemplary method includes, during first engine shutdown conditions, increasing excess oxygen to the particulate filter by spinning the engine with the energy conversion device, and regenerating the particulate filter. The method also includes, during second engine shutdown conditions, decreasing the excess oxygen to the particulate filter.