Desulfation Trigger Control for NOx Adsorber Regeneration
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Solution Overview
Problem
Current exhaust treatment systems for internal combustion engines face challenges in determining when to regenerate NOx adsorbers, managing interruptions during regeneration, and achieving both fuel economy and optimal regeneration performance, particularly in desulfation processes.
Innovation Solution
A system and method that includes a desulfation trigger module, sulfur loading estimate module, and interruption control module, integrated with an engine's electronic control unit, to determine when to initiate and complete the desulfation process, ensuring optimal regeneration conditions and handling interruptions, thereby improving fuel economy and regeneration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adsorber is regenerated frequently to maintain optimal performance, then regeneration performance is improved, but fuel economy deteriorates due to increased regeneration operations
Solution Approach 1:
The system continuously monitors sulfur loading levels through a sulfur loading estimate module that tracks sulfate accumulation in real-time. This feedback mechanism enables the control system to determine the precise moment when desulfation is needed, avoiding both premature and delayed regeneration operations, thereby optimizing the balance between maintaining adsorber performance and minimizing fuel consumption.
Solution Approach 2:
The system uses the engine's own operational parameters (fuel sulfur content, operating hours, exhaust conditions) to self-determine when desulfation is required. The sulfur loading estimate module calculates accumulated sulfate based on engine operation data, enabling the system to autonomously trigger desulfation only when necessary, eliminating the need for external monitoring or excessive preventive maintenance.
2Use of energy by moving object
If desulfation is delayed to improve fuel economy, then fuel economy is improved, but adsorber efficiency deteriorates due to sulfate accumulation
Solution Approach 1:
The sulfur loading estimate module provides continuous feedback on sulfate accumulation levels, enabling the control system to detect the precise threshold at which desulfation becomes necessary. This real-time monitoring ensures that desulfation is triggered at the optimal moment, preventing excessive sulfate buildup that would compromise adsorber efficiency while avoiding unnecessary early regeneration that would waste fuel.
3Reliability
If the desulfation process is continuously monitored to determine completion, then regeneration performance is improved, but device complexity increases
Solution Approach 1:
The system employs a sulfur loading estimate module that calculates sulfate accumulation based on engine operational parameters (fuel sulfur content, operating hours, exhaust temperature). This feedback mechanism provides continuous monitoring of desulfation progress, enabling the control system to automatically determine when the process is complete without requiring additional complex sensors or monitoring equipment.
4Measurement precision
If multiple parameters are monitored to determine desulfation timing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sulfur loading estimate module serves multiple functions: it tracks sulfur accumulation over time, estimates current sulfate loading levels, determines optimal desulfation timing, and monitors desulfation progress. By consolidating these multiple monitoring and calculation functions into a single integrated module that utilizes existing engine operational data, the system achieves high measurement precision for desulfation timing without proportionally increasing device complexity.
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 determines when to regenerate NOx adsorbers, handles interruptions, and optimizes regeneration performance, leading to improved fuel economy and extended adsorber efficiency by precisely controlling the desulfation process and maintaining engine performance.
Implementation Method 1
NOx storage catalyst units or adsorbers are used to purify exhaust gases of combustion engines. These NOx storage catalyst units, in addition to storing or trapping NOx, also trap and store unwanted SOx in the form of sulfates.
Data Source
AI summary
A system, method, and software for triggering regeneration of an adsorber connected with a flow of exhaust from an engine. A sulfur loading estimate module is used to generate an estimated sulfur loading value associated with an adsorber. A desulfation trigger module is used to trigger a desulfation event for the adsorber upon detection of a trigger event comprising either a cost-effective trigger event, a loading trigger event, and a forced trigger event. A combustion manager module is used to control an engine through engine management to regenerate the adsorber during the desulfation event. A interrupt module is used to interrupt the desulfation event upon detection of an interrupt event. An end desulfation module is used to stop or end the desulfation event upon detection of an end desulfation event.