Exhaust System Temperature-Constraining Regeneration Strategy
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Solution Overview
Problem
Active regeneration of particulate filters is often disabled in stop-and-go applications to prevent overheating, leading to extended regeneration times and energy inefficiencies when the engine is stationary or moving slowly, resulting in incomplete filter regeneration and subsequent performance losses.
Innovation Solution
An exhaust system with a controller that selectively heats the particulate filter using a heating device, activating different modes based on particulate matter accumulation and oxygen levels in the exhaust to constrain regeneration temperatures and maintain auxiliary heat during temperature constraining conditions, ensuring efficient regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If active regeneration is completely disabled when the machine is stationary or moving slowly, then the risk of overheating and igniting dry debris is reduced, but the regeneration time is extended and energy efficiency deteriorates
Solution Approach 1:
The system dynamically adjusts the regeneration strategy based on machine operating conditions (stationary vs. moving). When the machine is moving, complete regeneration is performed; when stationary, a constrained regeneration mode is used that maintains auxiliary heat without fully burning particulates, thus adapting the regeneration intensity to the operational context.
Solution Approach 2:
The system performs preliminary heating actions during stationary periods by maintaining auxiliary heat in the exhaust system. This preliminary action prevents the need for extensive reheating when the machine starts moving again, reducing subsequent regeneration time and energy requirements.
2Reliability
If active regeneration is disabled for extended periods, then safety concerns are mitigated, but the time and energy required to re-elevate exhaust temperature increases
Solution Approach 1:
The system maintains continuous auxiliary heating action during stationary periods instead of completely disabling regeneration. This continuous low-level heating preserves thermal energy in the exhaust system and particulate filter, ensuring that when the machine resumes movement, the regeneration process can be completed quickly without significant temperature ramp-up time.
3Object-affected harmful factors
If the machine operates in stop-and-go applications with frequent disabling of regeneration, then safety is maintained, but complete regeneration becomes impossible and continuous regeneration attempts are required
Solution Approach 1:
During stationary stop-and-go operations, the system performs partial regeneration actions by maintaining auxiliary heat without completing full particulate combustion. This partial action prevents excessive temperature buildup that would occur with complete regeneration, while still making progress toward particulate removal. When the machine moves, the remaining regeneration is completed.
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 strategy reduces the duration and energy required for subsequent regeneration events, improving regeneration efficiency and maintaining particulate reduction during stop-and-go operations by maintaining sufficient heat in the exhaust system, potentially shortening full regeneration time by up to 80%.
Implementation Method 1
Active regeneration is the burning away of trapped particulate matter at high temperatures, typically in excess of 600° C.
Implementation Method 2
The collected particulate matter can be removed from the particulate filter through a process called active regeneration. Active regeneration is the burning away of trapped particulate matter at high temperatures
Implementation Method 3
The controller may be further configured to detect a temperature constraining condition of the combustion engine, to determine an amount of oxygen within the flow of exhaust during the temperature constraining condition
Data Source
AI summary
An exhaust system for use with a combustion engine is disclosed. The exhaust system may have an exhaust passage, a particulate filter located within the exhaust passage, and a heating device located to selectively heat matter collected within the particulate filter. The exhaust system may also have a controller configured to determine an amount of matter collected within the particulate filter exceeding a threshold amount, and to activate the heating device in a first operating mode to regenerate the particulate filter based on the amount of collected matter. The controller may be further configured to detect a temperature constraining condition of the combustion engine, to determine an amount of oxygen within the flow of exhaust during the temperature constraining condition, and to activate the heating device in a second operating mode to constrain a regeneration temperature of the particulate filter based on the amount of oxygen within the flow of exhaust.