Virtual Fuel Sulfur Determination for SCR Catalyst Protection
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Solution Overview
Problem
Conventional aftertreatment systems for internal combustion engines face challenges in accurately determining sulfur concentration in fuels, leading to potential deterioration of oxidation and SCR catalysts due to sulfur poisoning, which affects regeneration events and overall system performance.
Innovation Solution
A controller-based system that determines actual SCR catalytic conversion efficiency and estimates sulfur concentration in fuels without physical sensors, enabling virtual determination and adjusting reductant insertion to protect the system from sulfur-related degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical sensors are used to determine sulfur concentration, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a virtual copy of the sulfur sensing function through software algorithms that estimate sulfur concentration based on SCR catalyst performance data. Instead of using a physical sulfur sensor, the system copies the measurement capability by modeling the relationship between sulfur concentration and catalyst efficiency, thereby achieving measurement functionality without the complexity of physical sensing hardware.
Solution Approach 2:
The patent replaces the mechanical/physical sensing system with a computational/software-based system. The sulfur concentration measurement function is substituted by algorithms that process exhaust gas data and catalyst performance metrics to estimate sulfur levels, eliminating the need for physical sulfur sensors and their associated complexity.
2Use of energy by moving object
If high sulfur content fuel is used, then energy density is improved, but catalyst deterioration increases
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors SCR catalyst conversion efficiency and uses this information to estimate sulfur concentration in real-time. Based on the estimated sulfur levels, the system adjusts reductant injection rates and regeneration timing to compensate for sulfur-induced catalyst deterioration, thereby maintaining catalyst reliability while allowing flexible fuel selection.
Solution Approach 2:
The patent performs preliminary estimation of sulfur concentration before significant catalyst damage occurs. By continuously monitoring catalyst efficiency and estimating sulfur levels in advance, the system can proactively adjust operating parameters and schedule regeneration events before sulfur accumulation causes irreversible catalyst deterioration.
3Adaptability or versatility
If SCR catalyst is exposed to sulfur, then fuel flexibility is improved, but conversion efficiency decreases
Solution Approach 1:
The patent implements dynamic adjustment of reductant injection rates based on real-time estimation of sulfur concentration. As sulfur levels change with different fuel types, the system dynamically modifies the urea injection rate to maintain optimal SCR conversion efficiency, allowing the system to adapt to various fuel compositions while preserving catalyst performance.
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 approach allows for accurate virtual determination of fuel sulfur concentration, preventing corrosion, reducing social concerns, and extending the life of aftertreatment systems by disabling reductant insertion and controlling regeneration based on sulfur levels.
Implementation Method 1
certain exhaust gas aftertreatment systems for diesel-powered IC engines comprise an oxidation catalyst for oxidizing carbon monoxide (CO) or unburnt hydrocarbons
Implementation Method 2
a selective catalytic reduction (SCR) system for decomposing constituents of the exhaust gas such as nitric oxides (NOx) gases included in the exhaust gas
Implementation Method 3
Determining an amount of sulfur concentration in the fuel is beneficial for determining sulfation of the SCR catalyst (i.e., absorption/adsorption of sulfur species on the SCR catalyst)
Data Source
AI summary
A control module for an aftertreatment system that includes a selective catalytic reduction (SCR) catalyst and an oxidation catalyst, comprises a controller configured to be operatively coupled to the aftertreatment system. The controller is configured to determine an actual SCR catalytic conversion efficiency of the SCR catalyst. The controller determines an estimated SCR catalytic conversion efficiency based on a test sulfur concentration selected by the controller. In response to the estimated SCR catalytic conversion efficiency being within a predefined range, the controller sets the test sulfur concentration as a determined sulfur concentration in a fuel provided to the engine. The controller generates a sulfur concentration signal indicating the determined sulfur.