Exhaust Sensor Placement Detection via Time Delay Analysis
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Solution Overview
Problem
Existing exhaust systems face challenges in accurately determining the placement of gas sensors, leading to potential mischaracterization of properly functioning sensors as faulty due to incorrect installation, which can affect the regulation of NOx emissions and overall system performance.
Innovation Solution
An exhaust control system that includes an operational sensor, an exhaust sensor, and a controller capable of detecting changes in operational and exhaust parameters, calculating the elapsed time between these changes, and determining the placement-related parameter of the exhaust sensor, thereby ensuring accurate sensor positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sensor placement is based on assumption or estimate, then installation complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The system performs preliminary detection of sensor placement by measuring the time delay between operational parameter changes and corresponding exhaust parameter changes. This preliminary action occurs during normal operation before final system calibration, allowing the controller to automatically determine accurate sensor placement without requiring precise manual installation.
2Device complexity
If sensor placement detection is not implemented, then device complexity is reduced, but reliability deteriorates
Solution Approach 1:
The system implements feedback by continuously monitoring the time delay between operational parameter changes (from operational sensor) and exhaust parameter changes (from exhaust sensor). This feedback loop allows the controller to detect placement deviations and compensate for them, ensuring reliable sensor functionality without adding complex external verification systems.
3Loss of information
If sensor placement is not verified, then loss of information is reduced, but measurement precision deteriorates
Solution Approach 1:
The system performs self-service by using its own operational sensor and exhaust sensor data to automatically determine sensor placement. The controller calculates the time delay between operational changes and exhaust responses, enabling the system to self-calibrate without requiring external verification equipment or additional information input.
Data Source
AI summary
An exhaust control system for use with a combustion engine is disclosed. The system may have an exhaust passage, an exhaust sensor located within the exhaust passage and configured to generate a first signal indicative of an exhaust parameter, and an operational sensor associated with the combustion engine and configured to generate a second signal indicative of an operational parameter. The system may have a controller associated with the combustion engine, the exhaust sensor, and the operational sensor. The controller may be configured to detect a change in the operational parameter based on the second signal and to detect a change in the exhaust parameter based on the first signal. The controller may measure an elapsed time between detection of the change in the operational parameter and the change in the exhaust parameter, and determine a placement-related parameter of the exhaust sensor based on the elapsed time.