Zero Ceria Catalyst Monitor Using Transient Sensor Responses
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Solution Overview
Problem
Current diagnostic methods for catalyst degradation in zero ceria washcoat catalysts face challenges due to the lack of oxygen storage materials, making it difficult to determine catalyst performance and degradation effectively.
Innovation Solution
A diagnostic method that measures transient sensor responses to engine control events to monitor catalyst degradation and performance by comparing upstream and downstream sensor readings, eliminating the need for added oxygen storage materials and allowing the use of precious metal only catalysts, using techniques such as response time, area under voltage curve, time delay, and signal length calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ceria or other high oxygen storage materials are added to the catalyst to enable degradation monitoring, then catalyst performance monitoring capability is improved, but manufacturing cost increases and catalyst composition becomes more complex
Solution Approach 1:
The patent extracts the oxygen storage function from the catalyst composition itself and places it in a separate diagnostic system. Instead of adding ceria to the catalyst, the system uses sensors and control events to monitor catalyst performance externally, eliminating the need for oxygen storage materials in the catalyst while maintaining monitoring capability
Solution Approach 2:
The patent introduces an intermediary diagnostic system consisting of upstream and downstream sensors that measure oxygen levels. This intermediary system enables catalyst performance monitoring without requiring the catalyst itself to contain oxygen storage materials, thus resolving the contradiction between monitoring capability and manufacturing cost
2Measurement precision
If ceria or other high oxygen storage materials are added to the catalyst to enable degradation monitoring, then catalyst performance monitoring capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the oxygen storage function from the catalyst composition and relocates it to the diagnostic system. The catalyst becomes simpler without ceria, while the diagnostic system incorporates the monitoring functionality through sensors and control events
Solution Approach 2:
The patent introduces an intermediary diagnostic system that mediates between the simple precious metal catalyst and the need for performance monitoring. The upstream and downstream sensors serve as intermediaries to detect catalyst degradation without requiring complex catalyst composition
3Ease of manufacture
If transient sensor response measurement is used to monitor zero ceria catalysts, then manufacturing cost is reduced by eliminating oxygen storage materials, but measurement precision for catalyst degradation becomes more difficult
Solution Approach 1:
The patent employs periodic control events (rich/lean transitions) to stimulate the catalyst and elicit measurable responses from the sensors. This periodic action enables the detection of catalyst degradation through transient sensor responses, maintaining measurement precision while using zero ceria catalysts
Solution Approach 2:
The patent changes the operating parameters by introducing controlled rich/lean transitions and measuring transient responses. This parameter change approach enables degradation detection in zero ceria catalysts by capturing dynamic sensor behavior rather than relying on steady-state oxygen storage differences
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 effective monitoring of catalyst performance and degradation for zero ceria catalysts, reducing costs associated with oxygen storage materials while complying with emissions regulations, and providing timely corrective actions through a malfunction indicator lamp.
Implementation Method 1
The first and second sensors can be O2 sensors
Data Source
AI summary
A catalyst degradation detection method for use with a zero ceria catalyst. The method uses techniques to measure transient responses to engine control events of upstream and downstream sensors to determine catalyst degradation and performance. By measuring transient behavior, the method can determine catalyst degradation and performance based on the limited oxygen storage of precious metal catalysts that do not include added ceria or other materials with high oxygen capture rates.