Catalytic Converter System Joint Diagnostic Threshold
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Solution Overview
Problem
Current catalytic converter systems assess individual converters separately, leading to premature identification of defects and unnecessary replacements, as differing depletion rates can result in one converter being deemed defective while the other still maintains sufficient conversion capability, causing unnecessary costs and emissions issues.
Innovation Solution
A control device assesses both catalytic converters jointly, evaluating their combined emissions and oxygen storage capacities to delay the replacement of a defective converter only when the system as a whole fails to meet emission limits, using a coordinated diagnostic process that adjusts threshold values based on the relative performance of each converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If individual catalytic converters are assessed separately based on predetermined threshold values, then the diagnostic procedure is simple and straightforward, but this leads to premature identification of defects and unnecessary replacements when one converter depletes faster than the other
Solution Approach 1:
The patent merges the assessment of multiple catalytic converters into a single joint evaluation process. Instead of independently comparing each converter against a fixed threshold, the system evaluates the combined oxygen storage capacity of all converters collectively. This allows the system to recognize when the aggregate capacity remains sufficient even if individual converters have depleted, thereby avoiding premature defect identification and unnecessary replacements while maintaining diagnostic simplicity.
2Object-affected harmful factors
If the oxygen storage capacity threshold is set to ensure adequate emissions conversion, then emissions compliance is maintained, but this leads to earlier replacement of catalytic converters that still possess sufficient combined conversion capability
Solution Approach 1:
The patent combines the oxygen storage capacities of multiple catalytic converters into a cumulative assessment. The system determines whether the total oxygen storage capacity of the converter system as a whole meets the predetermined threshold, rather than requiring each individual converter to meet the threshold separately. This approach allows converters with varying depletion rates to remain in service longer, as the system recognizes when the collective capacity remains sufficient for emissions compliance, thereby extending the operational life of the converter system.
3Reliability
If catalytic converters are replaced based on individual depletion rates, then each converter is maintained at optimal performance, but this increases operational costs through unnecessary replacements when the system as a whole still meets emission limits
Solution Approach 1:
The patent implements a combined assessment methodology that evaluates the total oxygen storage capacity of the catalytic converter system rather than individual converter performance. This system-level evaluation allows the diagnostic procedure to recognize when the aggregate capacity remains sufficient for emissions compliance, even if individual converters have depleted. Consequently, the system avoids unnecessary replacements, reducing operational costs while maintaining the reliability of the overall converter system through coordinated monitoring and threshold-based decision-making.
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 delays unnecessary replacements, reducing operational costs and ensuring overall emissions remain within limits by compensating for the weaker converter with the stronger one's capabilities, thereby extending the service life of the catalytic converter system.
Implementation Method 1
catalytic converters, which among other things convert the hydrocarbons (HC) contained in the exhaust gas with oxygen to water and carbon dioxide
Implementation Method 2
convert the hydrocarbons (HC) contained in the exhaust gas with oxygen to water and carbon dioxide
Implementation Method 3
The exothermal reaction of these exhaust gas components leads to a temperature elevation
Data Source
AI summary
A procedure is introduced to diagnose a catalytic converter system with at least two catalytic converters, through which separate exhaust gas flows flow, with the steps: test if oxygen storage capacities of the catalytic converters, which are at least two in number, exceed a predetermined threshold value. The procedure characterizes itself, in that the oxygen storage capacity of the first of two catalytic converters is compared with at least one first threshold value, in that an additional threshold value is ascertained as a function of a result of the comparison and in that the oxygen storage capacity of the second of two catalytic converters is compared with the additional threshold value. Additionally a control device is introduced, which executes the procedure.