Diesel Particulate Filter Regeneration Air Control
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Solution Overview
Problem
Conventional diesel engine systems face challenges in achieving optimal regeneration of particulate filters due to inconsistent air supply to combustion devices, leading to suboptimal regeneration results and reduced engine performance.
Innovation Solution
An emissions control system that includes a controller to monitor air parameters and adjust the operating conditions of the power source to ensure the combustion device receives sufficient air, maintaining an optimal equivalence ratio for effective regeneration of the filtering device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a compressor or air pump is used to supply combustion air to the burner, then the combustion air quantity can be controlled, but the system becomes more complex and may not achieve acceptable equivalence ratio under all conditions
Solution Approach 1:
The system uses the engine's own exhaust flow and air intake to provide combustion air for regeneration, eliminating the need for separate compressors or air pumps. The combustion air is derived from the engine's operational air flow, making the system self-sufficient and reducing complexity.
Solution Approach 2:
The combustion air supply system serves multiple functions: it provides air for normal engine combustion and simultaneously provides air for regeneration burns. This multi-functionality eliminates the need for dedicated regeneration air supply equipment.
2Ease of operation
If the combustion air quantity is strictly dependent on diesel engine speed, then the system is simpler to control, but it cannot achieve acceptable equivalence ratio under all regeneration conditions
Solution Approach 1:
The system dynamically adjusts combustion air quantity based on actual regeneration conditions rather than fixed engine speed dependencies. The controller modifies air flow to achieve optimal equivalence ratio under varying regeneration scenarios, making the system adaptable to different conditions.
Solution Approach 2:
The controller monitors regeneration progress and adjusts combustion air quantity accordingly. This feedback mechanism ensures the equivalence ratio remains within acceptable ranges by continuously adapting air flow to actual regeneration needs rather than relying on predetermined speed-based air supply.
3Reliability
If more air is provided to the burner to achieve better regeneration results, then the equivalence ratio improves, but the air-fuel mixture becomes too lean and regeneration efficiency decreases
Solution Approach 1:
The system precisely controls the equivalence ratio parameter to optimize regeneration. By maintaining the air-fuel mixture within the optimal range (neither too rich nor too lean), the system achieves effective particulate oxidation while maximizing combustion efficiency and minimizing energy waste.
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 ensures consistent and efficient regeneration of particulate filters by maintaining an optimal air-fuel ratio, preventing both suboptimal and excessive air supply, thereby enhancing engine performance and compliance with emission standards.
Implementation Method 1
The regeneration process may involve elevating the temperature of the flow of exhaust to a high temperature using, for example, a burner or other heating device. The heated flow of exhaust may pass through the DPF, thus oxidizing the particulate matter trapped within the DPF.
Implementation Method 2
The heated flow of exhaust may pass through the DPF, thus oxidizing the particulate matter trapped within the DPF.
Data Source
AI summary
A method for regenerating a filtering device is disclosed. The method may include creating a flow of exhaust with a power source and providing air to a combustion device configured to heat the flow of exhaust. The method may also include determining if a parameter is above a threshold. The parameter may be indicative of an amount of air provided to the combustion device. The method may further include modifying an operating condition of the power source if the parameter is above the threshold, where modifying the operating condition affects the parameter.