Ammonia Sensor Controller Interference Handling
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Solution Overview
Problem
Existing ammonia detection systems in internal combustion engines face accuracy issues due to interference from specific gases, particularly when oxygen concentration remains unchanged, leading to reduced ammonia detection accuracy.
Innovation Solution
A sensor controller that temporarily suspends the use of ammonia detection results when a specific state signal indicating the presence of interfering gases is received, allowing for accurate ammonia detection by distinguishing between ammonia and interfering gas signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ammonia sensor is used continuously to detect ammonia concentration, then the detection coverage is maximized, but the detection accuracy decreases when specific gases are present
Solution Approach 1:
The control device receives a specific state signal in advance that indicates the presence of interfering gases before they affect the ammonia sensor. This preliminary warning allows the system to proactively suspend ammonia sensor usage before inaccurate detections occur, resolving the contradiction by preparing the system ahead of time rather than reacting after accuracy degradation begins
Solution Approach 2:
The invention extracts and isolates the ammonia sensor from the detection system during periods when specific gases are present. By suspending the use of the ammonia sensor output signal when the specific state signal is active, the system separates the ammonia detection function from the overall exhaust gas analysis during interfering conditions, thereby maintaining accuracy while minimizing detection suspension time
2Measurement precision
If the ammonia sensor output signal is corrected based on oxygen concentration, then the detection accuracy is improved under certain conditions, but the accuracy is not sufficiently improved when oxygen concentration remains stable
Solution Approach 1:
The invention introduces a specific state signal as an intermediary indicator that directly signals the presence of interfering gases. This intermediary signal acts as a mediator between the complex chemical interactions in the exhaust gas and the ammonia sensor output, providing a simple binary state (specific gas present or absent) that triggers appropriate response actions without requiring complex real-time correction calculations
Solution Approach 2:
The system changes the operational parameter of the ammonia sensor from continuous operation to conditional operation based on the specific state signal. By switching the sensor output signal usage between active and suspended states based on the presence of specific gases, the system achieves high accuracy without the complexity of continuous correction algorithms, simply by changing the operational mode parameter
Data Source
AI summary
A sensor controller includes a signal reception determination section and a use suspension section. The signal reception determination section determines whether or not the sensor controller has received a specific state signal that indicates a specific state in which exhaust gas may contain a specific gas that differs from ammonia and reacts with an ammonia sensor. When the signal reception determination section determines that the sensor controller has received the specific state signal, the use suspension section suspends at least temporarily use of a detection result detected by the ammonia sensor after the determination. Specifically, upon reception of the specific state signal, the sensor controller suspends at least temporarily the use of the detection result detected by the ammonia sensor after the reception of the specific state signal.