Diesel Engine Load Management for Particulate Filter Regeneration
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Solution Overview
Problem
Diesel engines produce particulate emissions (soot) during operation, and existing solutions are inadequate in maintaining the necessary load conditions for effective regeneration of particulate filters, especially under highly cyclic loads.
Innovation Solution
A diesel engine system with a particulate filter and an auxiliary load management system using an insulated-gate bipolar transistor (IGBT) to selectively connect and disconnect loads, ensuring the engine parameter remains above a predetermined value for a significant portion of the cycle to regenerate the filter, either passively or actively, by maintaining a total load above a second load point for 10-40% of the cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the engine operates under highly cyclic loads, then the engine can meet varying power demands, but the particulate filter cannot be effectively regenerated due to insufficient time above the second load point
Solution Approach 1:
The system applies periodic action by introducing an auxiliary load that is selectively applied during specific portions of the cyclic load cycle. The controller monitors the cyclic load and applies the auxiliary load during periods when the total load would otherwise be below the second load point, creating periodic regeneration opportunities that align with the cyclic nature of the primary load while ensuring sufficient time above the regeneration threshold.
2Reliability
If the total load is maintained above the second load point for the entire cycle, then the particulate filter can be regenerated, but the engine efficiency decreases due to unnecessarily high load during low-demand periods
Solution Approach 1:
The system applies partial action by selectively applying the auxiliary load only during the specific time periods needed to achieve regeneration, rather than maintaining excessive load continuously. The controller calculates the minimum duration required to maintain the total load above the second load point for the specified 10-40% of the cycle, applying the auxiliary load only during this necessary period, thereby avoiding unnecessary energy consumption during other periods.
3Reliability
If an auxiliary load is added to maintain the total load above the second load point, then the particulate filter can be regenerated, but the system complexity increases due to additional components and control mechanisms
Solution Approach 1:
The system applies universality by designing the auxiliary load and control mechanism to serve multiple functions: (1) maintaining total load above the second load point for particulate filter regeneration, (2) adapting to varying cyclic load demands, and (3) optimizing engine efficiency by applying load only when necessary. The controller integrates multiple monitoring and control functions into a single system that manages both the primary cyclic load and the auxiliary load, reducing overall system complexity despite the added functionality.
Data Source
AI summary
A power generating set includes an engine operable in response to a flow of fuel to produce a flow of exhaust gas, a generator coupled to the engine and operable in response to operation of the engine to produce a total electrical power, and a primary load electrically connected to the generator to receive a portion of the total electrical power, the primary load having a cyclical pattern. A battery bank is selectively connected to the generator to receive a portion of the total electrical power and an insulated-gate bipolar transistor (IGBT) is positioned to selectively transition between a connected state and a disconnected state. The battery bank is connected to the generator to charge the battery bank when the IGBT is in the connected state and is disconnected from the generator when the IGBT is in the disconnected state.