Temperature Sensor Position Verification in Emission Control Systems
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Solution Overview
Problem
Current methods for determining the correct position of temperature sensors in emission control systems of combustion engines are inadequate, leading to potential tampering detection errors, which can result in improper vehicle operation and environmental regulation violations due to inaccurate temperature readings.
Innovation Solution
A method involving the determination of reference temperatures within specific intervals, measurement of corresponding temperatures, and calculation of a characteristic parameter to assess the sensor's position, distinguishing between correct and incorrect placements, including the use of a nipple, to provide a robust and accurate detection of tampering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a temperature sensor is arranged using a threaded hole with a nipple in the emission control system, then the sensor can be easily installed and positioned, but the sensor position may be dislocated causing inaccurate temperature detection
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing reference temperatures at multiple positions within the emission control system before actual operation. During runtime, the measured temperature is compared against these pre-established reference values to detect positioning errors, enabling early detection without requiring complex real-time analysis
Solution Approach 2:
The system implements feedback by continuously comparing the measured temperature from the sensor against reference temperatures obtained from thermal models or measurements. When the difference exceeds a threshold, the system generates an alarm or error code, creating a closed-loop verification mechanism that detects positioning deviations
2Productivity
If a simple temperature comparison method is used to detect sensor tampering, then the detection process is simple and fast, but the detection accuracy is insufficient due to model limitations
Solution Approach 1:
The patent segments the temperature comparison process into multiple evaluation stages: first comparing against reference temperatures from thermal models, then validating against multiple measured temperature values at different positions, and finally applying threshold-based decision logic. This multi-layered segmentation improves detection reliability while maintaining computational efficiency
Solution Approach 2:
The system achieves universality by using a single measurement approach that serves multiple functions: normal temperature monitoring, tampering detection, and positioning verification. The same temperature comparison mechanism handles both routine operation and diagnostic functions, eliminating the need for separate detection systems
3Measurement precision
If the temperature sensor is positioned to measure exhaust gas temperature directly, then accurate temperature readings are obtained, but the sensor becomes vulnerable to tampering and positioning errors
Solution Approach 1:
The patent applies preliminary anti-action by establishing reference temperature profiles and detection criteria before the sensor can be tampered with. The system proactively compares measured temperatures against expected values from thermal models, preventing undetected tampering by continuously validating sensor readings against predetermined expectations
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
This approach enables reliable and cost-effective detection of temperature sensor tampering, ensuring accurate temperature readings and preventing environmental violations by differentiating between correct and incorrect sensor positions, thereby improving the operation of emission control systems.
Implementation Method 1
a temperature sensor is often provided so as to measure a prevailing temperature of exhaust gases from said engine
Data Source
AI summary
A method that determines a correct or an incorrect position of a temperature sensor in an emission control system, the method including: determining a first reference temperature within a first temperature interval; measuring a first temperature with the temperature sensor corresponding to the first temperature interval; determining a second reference temperature within a second temperature interval; measuring a second temperature with the temperature sensor corresponding to the second temperature interval; determining a value for a characteristic parameter based on the first reference temperature, the first measured temperature, the second reference temperature and the second measured temperature; comparing the determined value for the characteristic parameter with a predetermined characteristic parameter threshold value that is based upon the determined operation parameter results for different positions of the temperature sensor for predetermined engine operation characteristics; and based upon the comparison, determining a correct or an incorrect position of the temperature sensor.