Solid Storage Media Quality Determination via Pressure Differential
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Solution Overview
Problem
Current solid media storage systems for ammonia (NH3) in aftertreatment systems lack direct measurement and verification methods to determine their quality, making it difficult to assess if they require service, have been tampered with, or are insufficient for meeting emissions requirements.
Innovation Solution
A system and method that includes a controller with modules to determine the quality of solid storage media for NOx reductants, utilizing sensors to measure temperature and pressure, and comparing expected and actual gaseous reductant pressures to detect deviations, indicating potential service needs or quality issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid storage media systems for NH3 are used in aftertreatment systems, then the SCR system can work at temperatures below traditional urea-based SCR systems and avoid deposit problems, but there is no direct measurement method to determine the quality of the solid storage media
Solution Approach 1:
The patent introduces an intermediary measurement system that uses pressure sensors to monitor the pressure differential across the solid storage media. This intermediary measurement approach allows indirect assessment of media quality without directly measuring the media itself, resolving the contradiction between system reliability and measurement capability.
Solution Approach 2:
The patent replaces direct mechanical or chemical analysis of the solid storage media with a pressure-based measurement system. By measuring pressure differentials and using this data to infer media quality, the system achieves reliable quality assessment without complex direct measurement apparatus.
2Object-generated harmful factors
If solid storage media are used to store NH3, then the system operates without urea-derived deposit problems, but the media need to be re-charged or replaced when NH3 is depleted and there is no way to verify quality or detect tampering
Solution Approach 1:
The patent implements a feedback mechanism where pressure sensors continuously monitor the solid storage media, and the controller processes this data to provide information about media quality, NH3 depletion status, and potential tampering. This feedback loop prevents information loss by continuously reporting system state to the vehicle operator or maintenance system.
Solution Approach 2:
The solid storage media system performs self-verification through the pressure measurement system. The media's own pressure characteristics provide information about its quality and state, eliminating the need for external verification systems and enabling the system to self-report its condition.
3Device complexity
If no direct measurement method is available for solid storage media quality, then the system is simpler, but it is impossible to determine if the media requires service, has been tampered with, or is insufficient for emissions requirements
Solution Approach 1:
The patent uses pressure differential measurements as an intermediary indicator of solid storage media quality. Rather than directly measuring complex media properties, the system measures pressure changes that result from media degradation or tampering, providing a simple yet reliable method to assess emissions compliance.
Solution Approach 2:
The patent monitors changes in pressure parameters over time to detect media quality degradation. By tracking pressure differential changes and comparing them against expected patterns, the system can determine when media requires service or replacement while maintaining simple measurement hardware.
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
Enables direct assessment of solid storage media quality, preventing false positives and ensuring compliance with emissions standards by accurately detecting depletion, improper materials, or tampering, thereby facilitating timely maintenance and regulatory compliance.
Implementation Method 1
determine the actual pressure of the gaseous reductant in the supply line
Implementation Method 2
determine a first parameter value corresponding to an expected gaseous reductant pressure in a reductant supply line based on a temperature of a solid storage media
Implementation Method 3
ammonia (NH3) storage have been developed as a source of reductant in selective catalytic reduction (SCR). By dosing gaseous ammonia desorbed or generated from the decomposition of solid storage media
Implementation Method 4
ammonia (NH3) storage have been developed as a source of reductant in selective catalytic reduction (SCR). By dosing gaseous ammonia desorbed or generated from the decomposition of solid storage media
Data Source
AI summary
A system and method includes an exhaust aftertreatment system for an internal combustion engine having a reductant stored in a solid storage media. The reductant is released by heating the solid storage media to convert the reductant to gaseous form. The system and method determines the quality of the solid storage media by measuring operating parameters of the aftertreatment system and comparing the operating parameters to expected parameters stored in a memory of a controller of the system.