Catalytic Configuration Diagnosis via Temperature Cycling
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Solution Overview
Problem
Current emission control systems for combustion engines face challenges in diagnosing impaired catalytic configurations, particularly due to sulphur poisoning and manual tampering, which affect NOx-conversion performance and can lead to environmental violations and engine torque limitations.
Innovation Solution
A method and system that continuously or intermittently determine the NOx-conversion ratio and temperature of the catalytic configuration, adjusting the temperature above or below a predetermined value to differentiate between sulphur poisoning and other causes, allowing for accurate identification and remediation of impaired performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature of catalytic configuration is increased above predetermined value, then sulphur poisoning is removed and performance is improved, but energy consumption increases and operating conditions become more extreme
Solution Approach 1:
The system dynamically adjusts the temperature parameter of the catalytic configuration based on detected performance degradation. When sulphur poisoning is detected through NOx-conversion ratio monitoring, the system temporarily increases temperature above the predetermined value to desorb sulphur, then returns to normal operating temperature, thus resolving the contradiction between maintaining performance and minimizing energy consumption.
Solution Approach 2:
The diagnostic and temperature adjustment process is implemented periodically rather than continuously. The system monitors NOx-conversion ratio over time and only activates high-temperature regeneration when degradation patterns indicate sulphur poisoning, thereby reducing overall energy consumption while maintaining catalytic performance when needed.
2Measurement precision
If diagnostic procedures are implemented to determine cause of impaired performance, then accurate diagnosis is achieved, but system complexity and measurement requirements increase
Solution Approach 1:
The catalytic configuration essentially diagnoses itself through the control system's monitoring of NOx-conversion ratio. The system compares actual conversion performance against expected performance patterns for different degradation causes (sulphur poisoning vs. manual tampering), enabling accurate diagnosis without requiring external diagnostic equipment or complex additional sensors.
Solution Approach 2:
The existing NOx-sensors and control unit, originally designed for emission control, are also utilized for diagnostic purposes. The same measurement infrastructure serves dual functions: maintaining emission compliance and detecting degradation causes, thereby achieving accurate diagnosis without adding significant system complexity.
3Reliability
If temperature is continuously monitored and adjusted, then sulphur poisoning can be detected and treated, but energy consumption and operational complexity increase
Solution Approach 1:
Temperature monitoring and adjustment are performed periodically based on diagnostic needs rather than continuously. The system monitors NOx-conversion ratio continuously but only activates temperature adjustment when degradation patterns suggest sulphur poisoning, minimizing energy loss while maintaining reliable detection capability.
Solution Approach 2:
The system changes temperature parameter only when and where needed based on diagnostic results. By monitoring conversion ratios and identifying sulphur poisoning patterns, the system temporarily adjusts temperature to treat the condition, then returns to normal operation, thereby reducing overall energy loss while maintaining reliable detection and treatment capability.
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 provides a cost-effective and reliable means to diagnose sulphur poisoning and other causes of impaired performance, enabling appropriate control measures to restore engine efficiency and compliance with regulations.
Implementation Method 1
catalytic configuration for emission control of the exhaust gas of a combustion engine, said catalytic configuration being arranged for NOx-conversion
Implementation Method 2
increasing the temperature of said catalytic configuration from a prevailing temperature below a predetermined temperature value to a temperature above said predetermined temperature value, said predetermined temperature value representing a temperature above which sulphur, poisoning said catalytic configuration, is removed from said catalytic configuration
Data Source
AI summary
A method that determines a cause for the impaired performance of a catalytic configuration of the exhaust gas of a combustion engine (231), the method including determining (s410) a course of a NOx-conversion ratio; determining (s420) a prevailing temperature of the catalytic configuration; increasing (s430) the temperature of the catalytic configuration from a prevailing temperature below a predetermined temperature value (Te) to a temperature (TSred) above the predetermined temperature value above which sulphur is removed from the catalytic configuration; and/or decreasing (s440) the temperature of the catalytic configuration from a prevailing temperature (TSred) above the predetermined temperature value (Te) to a temperature below the predetermined temperature value so as to impair the performance of the catalytic configuration in case sulphur is present; and determining (s450) one cause out of a set of causes on the basis of the course of the NOx-conversion ratio thus determined.