Auxiliary Particulate Filter Regeneration for Low Exhaust Temperature
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Solution Overview
Problem
Particulate filters in vehicles with diesel engines often fail to regenerate sufficiently due to fluctuating driving conditions and reduced exhaust gas temperatures, leading to poor performance and potential engine shutdown, especially with high soot accumulation.
Innovation Solution
An auxiliary standalone particulate filter regeneration system that combusts fuel in the exhaust pipe to raise temperatures sufficiently for oxidizing particulates, using a system with supply lines and an igniter to regenerate the filter independently of the vehicle's onboard system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the vehicle's onboard regeneration system is used, then the system complexity is reduced, but the exhaust temperature is insufficient to oxidize accumulated particulates
Solution Approach 1:
An auxiliary standalone regeneration system is introduced as an intermediary device that couples to the exhaust pipe via access ports. This external system provides the additional thermal energy needed to raise exhaust temperatures to oxidation levels without modifying the vehicle's original regeneration architecture, thus resolving the temperature deficiency while maintaining system simplicity.
Solution Approach 2:
The regeneration function is segmented into two independent systems: the vehicle's onboard system and the auxiliary standalone system. The auxiliary system operates independently through releasably coupled supply lines that deliver fuel and oxidant directly to the exhaust pipe, allowing temperature enhancement without entangling the complexity of the original system.
2Ease of operation
If the particulate filter is located downstream with long exhaust pipe length, then the filter placement is flexible, but temperature losses increase reducing regeneration effectiveness
Solution Approach 1:
The auxiliary regeneration system performs preliminary heating action by injecting and combusting fuel upstream of the particulate filter location. This pre-heats the exhaust gases before they reach the filter, compensating for temperature losses along the long exhaust pipe and ensuring sufficient temperature for particulate oxidation regardless of filter placement.
3Adaptability or versatility
If driving conditions fluctuate, then the vehicle adapts to various loads, but the regeneration system cannot maintain sufficient temperature for filter regeneration
Solution Approach 1:
The auxiliary regeneration system operates as a self-service mechanism with fuel and oxidant supply lines that automatically deliver reactants to the exhaust pipe based on regeneration needs. The system includes control mechanisms that activate regeneration cycles independently of fluctuating driving conditions, ensuring reliable particulate oxidation regardless of vehicle load variations.
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
Effectively regenerates particulate filters by raising exhaust temperatures to oxidize soot, ensuring filter cleanliness and preventing engine shutdown, even under conditions where onboard systems cannot regenerate effectively.
Implementation Method 1
combusts fuel in the exhaust pipe to raise temperatures sufficiently for oxidizing particulates
Implementation Method 2
raising exhaust temperatures to oxidize soot
Data Source
AI summary
Embodiments described herein methods can be used in particulate filter regeneration, such as particulate filters used for filtering the exhaust of an engine, e.g., a diesel engine. Systems herein can be configured to dispense combustion gas(es) into housing were a particulate filter is contained and to ignite the combustion gases. Methods for conducting a safety verification process of such systems are disclosed, as well as methods for regenerating the filters. Still other embodiments are described.