Coated Particulate Filter Sulfur Detection via NOx Efficiency
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Solution Overview
Problem
Existing sulfur sensors for motor vehicles are costly to produce and not suitable for mass production, limiting their availability for detecting excessive sulfur content in exhaust tracts.
Innovation Solution
A method for determining sulfur content in a motor vehicle's exhaust tract by measuring changes in nitrogen oxide abatement efficiency and ammonia storage capacity of a coated particulate filter, with comparisons to threshold values to detect excessive sulfur content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sulfur sensor is arranged in the exhaust tract to detect excessive sulfur content, then the ability to detect misfueling is improved, but the development costs and manufacturing complexity increase significantly
Solution Approach 1:
Instead of using a complex dedicated sulfur sensor, the patent uses a coated particulate filter that already exists in the exhaust system and copies its functionality to detect sulfur content by monitoring changes in its performance characteristics
Solution Approach 2:
The coated particulate filter serves multiple functions: it continues to reduce pollutants as its primary function while simultaneously acting as a sulfur content indicator through monitoring its nitrogen oxide abatement efficiency and ammonia storage capacity changes
2Object-generated harmful factors
If a coated particulate filter is used to reduce pollutant emissions, then environmental compliance is improved, but the system becomes more complex and requires precise monitoring
Solution Approach 1:
The system implements feedback by continuously monitoring the nitrogen oxide abatement efficiency and ammonia storage capacity of the coated particulate filter, comparing these parameters against threshold values to detect defects and trigger appropriate responses
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 method allows for a more precise and cost-effective determination of sulfur content, enabling early detection of excessive sulfur levels and facilitating appropriate countermeasures.
Implementation Method 1
a coated particulate filter combines the functionalities of an SCR catalytic converter and a diesel particulate filter. It reduces both the nitrogen oxide emissions NOx and the soot emissions of the vehicle
Implementation Method 2
a determined ammonia storage capacity change of a coated particulate filter arranged in the exhaust tract
Data Source
AI summary
Various embodiments of the teachings herein include methods for determining the sulfur content in an exhaust tract of a motor vehicle. The method may include: determining a change in the nitrogen oxide abatement efficiency of a coated particulate filter arranged in the exhaust tract and/or a determined ammonia storage capacity change of a coated particulate filter arranged in the exhaust tract; comparing the determined change to a threshold value; identifying an excessive sulfur content if the comparison shows that the determined change exceeds the threshold value; and undertaking one or more corrective actions in response to identifying an excessive sulfur content.