Reducing Agent Injection Valve Clogging Detection
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Solution Overview
Problem
The existing clogging determination method for reducing agent injection valves in exhaust gas purification systems does not account for individual system differences, leading to inaccurate clogging detection due to dispersion in injection control and sensor response, making it difficult to distinguish between clogging and system-specific variations.
Innovation Solution
A clogging determining device and method that calculates and compares opened-valve and closed-valve pressure reduction amounts to determine clogging, offsetting system-specific variations and accurately detecting abnormal pressure states caused by valve clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the existing clogging determination method uniformly compares experimentally obtained pressure reduction amount with sensor values, then the determination process is simple, but individual system differences cause inaccurate clogging detection
Solution Approach 1:
The system performs preliminary characterization by storing multiple pressure reduction amounts obtained under normal conditions before actual operation. These pre-stored values represent the individual system's baseline behavior, allowing accurate comparison during operation without adding complexity to the determination process itself
Solution Approach 2:
The invention changes from using a single uniform reference value to using multiple reference values that account for system variations. By storing several pressure reduction amounts and comparing against these varied references, the system adapts to individual differences while maintaining a simple determination process
2Reliability
If a large pressure reduction amount is set as reference for clogging determination, then false positives are reduced, but accurate clogging detection becomes difficult
Solution Approach 1:
Instead of using a single large reference value that may miss subtle clogging, the system stores multiple pressure reduction amounts. This allows comparison against a range of normal values, enabling detection of partial deviations that indicate early-stage clogging while maintaining reliability by requiring consistent deviation across multiple reference comparisons
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 precise clogging determination of reducing agent injection valves by offsetting system-specific pressure variations, ensuring accurate maintenance and efficient injection control, while minimizing errors from residual reducing agent and system dispersion.
Implementation Method 1
pressure detecting means for detecting the pressure in the supply passage
Data Source
AI summary
Provided is a clogging determining device and a clogging determining method for a reducing agent injection valve, which enable clogging of the reducing agent injection valve to be determined with high precision in further consideration of the individual difference of the system. There are provided an opened-valve pressure reduction amount calculating element for calculating an opened-valve pressure reduction amount representing a pressure reduction amount in the supply passage which is reduced in a predetermined time when the pressure-feeding operation of the pump is stopped under the state that the reducing agent injection valve is set to an injection mode, a closed-valve pressure reduction amount calculating element for calculating a closed-valve pressure reduction amount representing the pressure reduction amount in the supply passage which is reduced in a predetermined time when the pressure-feeding operation of the pump is stopped under the state that the reducing agent injection valve is set to a full-close mode; and a clogging determining element for comparing the opened-valve pressure reduction amount with the closed-valve pressure reduction amount to determine clogging of the reducing agent injection valve.