Oxidation Catalyst Degradation Sensing via Filter Regeneration Temperature
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Solution Overview
Problem
Existing methods for detecting oxidation catalyst degradation in exhaust gas treatment systems face challenges such as the need for stable environmental conditions and costly sensors, leading to inaccurate or impractical degradation assessments.
Innovation Solution
A system that includes a temperature sensor and differential pressure sensor to detect temperatures between an oxidation catalyst and a filter, calculating an average temperature during filter regeneration to assess catalyst degradation, allowing for cost-effective and accurate degradation detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature increase rate of the oxidation catalyst is calculated under stable environmental conditions to detect degradation, then the degradation detection accuracy is improved, but the device complexity and cost increase due to the need for multiple calculations and high-resolution sensors
Solution Approach 1:
The patent extracts the temperature measurement function from complex environmental monitoring and isolates it to a single temperature sensor positioned between the oxidation catalyst and filter. This simplifies the device by removing the need for multiple sensors and complex environmental stabilization systems, while still enabling degradation detection through temperature averaging during regeneration.
Solution Approach 2:
Instead of directly measuring multiple parameters to assess degradation, the patent uses temperature as a proxy indicator. By measuring temperature during regeneration and averaging it, the system creates a simplified copy of the degradation state that can be detected with lower-resolution sensors, reducing device complexity while maintaining detection capability.
2Measurement precision
If the temperature increase rate variation is small, then the degradation detection becomes more challenging, but calculating multiple times increases the device complexity and cost
Solution Approach 1:
The patent implements continuous temperature measurement during the regeneration process and calculates the average temperature over the entire regeneration period. This continuous measurement approach accumulates sufficient data to detect small temperature variations caused by catalyst degradation, enabling accurate detection without requiring excessively high sensor resolution or multiple separate measurement cycles.
3Measurement precision
If CO/HC/NO sensors are provided to measure oxidation rates, then the degradation detection accuracy is improved, but the device cost increases
Solution Approach 1:
The patent makes the temperature sensor serve multiple functions: it monitors catalyst temperature during normal operation, measures temperature during regeneration, and enables degradation detection through temperature averaging. This multi-functional use of a single inexpensive temperature sensor replaces the need for expensive CO/HC/NO sensors, significantly reducing device cost while maintaining degradation detection 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
Enables suitable detection of oxidation catalyst degradation using averaged temperatures, reducing the need for high-resolution sensors and improving accuracy in degradation assessment.
Implementation Method 1
a temperature detecting device for detecting a temperature between the oxidation catalyst and the filter
Implementation Method 2
a controller which executes a regeneration processing of heating the filter to burn the particle accumulated on the filter
Implementation Method 3
an oxidation catalyst provided upstream of the filter for oxidizing unburnt fuel
Data Source
AI summary
A working machine, an oxidation catalyst degradation detection device, an oxidation catalyst degradation detection method, and an oxidation catalyst degradation detection program are provided, which enable a suitable detection of a degradation of an oxidation catalyst. A working machine includes a temperature detecting device for detecting a temperature between an oxidation catalyst and a filter, and a controller. The controller calculates an average of temperatures detected by the temperature detecting device in a regeneration processing of the filter, and calculates a degradation degree of the oxidation catalyst on the basis of the calculated average.