Diesel Particulate Filter Regeneration Fuel Dilution Control
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Solution Overview
Problem
Conventional engine control strategies for diesel particulate filter regeneration fail to maintain acceptable fuel dilution levels and engine performance, particularly during transient operations, leading to reduced combustion efficiency and increased fuel dilution.
Innovation Solution
An integrated system comprising a regeneration module, turbocharger thermal management module, fuel injection thermal management module, and air intake thermal management module, which determines desired exhaust gas temperatures and fuel injection strategies to maintain fuel dilution levels and optimize engine performance during regeneration events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional engine control strategies are used during regeneration events, then the diesel particulate filter can be regenerated, but fuel dilution levels increase and engine performance deteriorates
Solution Approach 1:
The system dynamically adjusts fuel injection timing and quantity based on real-time engine operating conditions and exhaust temperature measurements. The control strategy transitions between different injection patterns (single injection, split injection, post-injection) depending on the regeneration phase and engine load, optimizing the balance between achieving required exhaust temperatures for DPF regeneration and minimizing fuel dilution of lubricating oil.
Solution Approach 2:
The control system modifies key combustion parameters including injection timing advance/retard, injection pressure, and air-to-fuel ratio during regeneration events. By adjusting these parameters, the system achieves the necessary exhaust gas temperatures for effective soot oxidation while controlling the amount and timing of fuel addition to minimize unwanted fuel dilution effects on engine performance.
2Reliability
If exhaust gas temperature is increased to achieve DPF regeneration, then particulate matter is oxidized and removed, but engine performance and combustion efficiency are reduced
Solution Approach 1:
The system implements periodic regeneration events rather than continuous high-temperature operation. During normal operation, the engine runs at optimal combustion parameters for performance. When soot accumulation reaches a threshold, the control system initiates a timed regeneration sequence that temporarily adjusts parameters to achieve oxidation, then returns to normal operating parameters, thus maintaining overall engine performance while periodically removing particulate matter.
Solution Approach 2:
The system uses exhaust gas recirculation (EGR) and selective catalytic reduction (SCR) as intermediary mechanisms to facilitate the regeneration process. These intermediaries help achieve the necessary chemical reactions for soot oxidation while buffering the direct impact on main combustion parameters, thereby protecting engine performance while enabling effective particulate matter removal.
3Temperature
If multiple post-injections are used to control exhaust temperature, then regeneration can be maintained, but fuel dilution increases
Solution Approach 1:
The control system applies partial post-injections rather than full-dose injections during regeneration events. By injecting only the minimum necessary fuel quantity to maintain exhaust temperature above the oxidation threshold (typically 250-300°C), the system achieves the required thermal conditions for DPF regeneration while limiting the total fuel added to the combustion chamber, thus reducing fuel dilution of the lubricating oil.
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
The system effectively controls engine exhaust gas temperatures and fuel dilution levels, ensuring efficient regeneration of the diesel particulate filter while maintaining engine performance and reducing negative impacts on fuel economy and combustion efficiency.
Implementation Method 1
To oxidize the accumulated particulate matter, exhaust gas temperatures generally must exceed the temperatures typically reached at the filter inlet. Consequently, additional methods to initiate regeneration of a diesel particulate filter may be used. In one method, a reactant, such as diesel fuel, is introduced into an exhaust after-treatment system to initiate oxidation of particulate buildup and to increase the temperature of the filter.
Implementation Method 2
Particulate matter, in general, oxidizes in the presence of NO2 at modest temperatures, or in the presence of oxygen at higher temperatures. If too much particulate matter has accumulated when oxidation begins, the oxidation rate may get high enough to cause an uncontrolled temperature excursion.
Implementation Method 3
A common DPF comprises a porous ceramic matrix with parallel passageways through which exhaust gas passes. Particulate matter subsequently accumulates on the surface of the filter.
Data Source
AI summary
Various embodiments of an apparatus, system, and method are disclosed for managing regeneration event characteristics. For example, according to one embodiment, an apparatus for controlling the temperature of the output exhaust of an internal combustion engine for a regeneration event on a particulate matter filter includes a regeneration module, a turbocharger thermal management module, a fuel injection thermal management module, and an air intake thermal management module. The regeneration module determines a desired particulate matter filter inlet exhaust gas temperature for a regeneration event. The turbocharger thermal management module determines a variable geometry turbine (VGT) device position strategy. The fuel injection thermal management module determines a fuel injection strategy. The air intake thermal management module determines an intake throttle position strategy. The VGT device position strategy, the post-injection fuel injection strategy, and the intake throttle position strategy cooperatively achieve the desired particulate matter filter inlet exhaust gas temperature and maintain a fuel dilution level of the engine below a maximum fuel dilution level.