Temperature Sensor Correction in Exhaust Gas Pipes
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Solution Overview
Problem
Temperature measurement precision in gas pipes is compromised due to geometric positioning constraints and reduced detection areas of temperature sensors in exhaust lines of internal combustion engines, impacting the accuracy of temperature regulation and soot burning in particle filters.
Innovation Solution
A method for correcting initial temperature values measured by main temperature sensors using upstream temperature values, mass flow rates, and environmental temperatures, calculated through a thermodynamic balance model, without requiring hardware changes or more precise sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the main temperature sensor is positioned in limited space within the exhaust line, then the device complexity is reduced, but the measurement precision deteriorates due to reduced detection zone and temporal response
Solution Approach 1:
The patent introduces an intermediary calculation method that uses the measured temperature difference between two sensors and the mass flow rate to compute the actual temperature at the sensor location. This mathematical intermediary compensates for the reduced detection zone and positioning constraints, allowing accurate temperature measurement without requiring the sensor to be positioned in the optimal measurement area.
2Ease of operation
If the temperature sensor detection zone is reduced due to geometric constraints, then the ease of operation is improved, but the measurement precision deteriorates
Solution Approach 1:
The patent changes the parameter approach from direct temperature measurement to temperature difference measurement combined with mass flow rate data. By using the temperature difference (Tout - Tin) and mass flow rate (D) in the correction formula, the system achieves accurate temperature calculation at the sensor location even with reduced detection zone, making the sensor easier to install while maintaining measurement precision.
3Measurement precision
If multiple temperature sensors are installed along the exhaust system to improve measurement precision, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent creates a virtual copy of the temperature measurement system through mathematical modeling. Instead of installing additional physical sensors to capture temperature at the exact sensor location, the system uses the temperature difference between two sensors and mass flow rate data to calculate the temperature that would exist at the sensor location, effectively copying the measurement function through computation rather than additional hardware.
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
Improves temperature measurement precision, enabling effective regulation of particle filter temperatures and reducing the risk of thermomechanical damage, while maintaining cost-effectiveness and ease of integration.
Implementation Method 1
measurement of an upstream temperature value by an upstream temperature sensor located upstream of the main temperature sensor along the gas line
Implementation Method 2
The corrected value is further calculated based on the mass flow rate of the gas flowing in the gas pipeline
Data Source
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AI summary
The invention relates to a method for correcting an initial temperature value measured by a main temperature sensor (Cout) located in a gas pipe (31) in which a gaseous fluid flows, characterized in that the method comprises the following steps: - measurement of an upstream temperature value by an upstream temperature sensor (Cin) located upstream relative to said main temperature sensor along the gas pipe, - calculation of a corrected value of the initial temperature value as a function of the initial temperature value and the upstream temperature value.