Exhaust Sensor Assembly Remote Mounting Bracket Heat Isolation
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Solution Overview
Problem
Conventional exhaust aftertreatment systems face challenges with sensor degradation due to excessive heat and vibration, leading to fault codes and increased costs, particularly in vehicles with limited space and stationary applications where heat buildup occurs.
Innovation Solution
The design of an exhaust aftertreatment system with a sensor assembly mounted on a two-part sensor table that includes air gaps and optimized structural features to minimize heat transfer and vibration, using standoffs and air flow channels to create insulation layers and reduce conductive heat transfer, while also providing structural strength through ribs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sensors are mounted directly on the housing exterior, then ease of installation and access is improved, but heat transfer to sensors increases causing degradation and failure
Solution Approach 1:
A sensor assembly with mounting bracket is introduced as an intermediary component between the housing and sensors. The mounting bracket includes heat isolation features such as air gaps and heat shielding that reduce thermal conduction from the hot housing to the sensors, while still providing secure mounting and easy access during installation and maintenance.
2Device complexity
If sensors are mounted directly on the housing exterior, then device complexity is reduced, but vibration exposure increases causing fault codes and failure
Solution Approach 1:
The mounting bracket serves as a vibration-isolating intermediary that attaches to the housing but provides a dampened mounting environment for sensors. It includes vibration isolation features such as flexible mounting elements and damping structures that reduce vibration transmission from the engine and housing to the sensitive sensors.
3Reliability
If heat transfer to sensors is minimized through air gaps and insulation, then sensor reliability is improved, but heat transfer path complexity increases
Solution Approach 1:
The heat isolation function is segmented into multiple independent features within the mounting bracket: air gaps between bracket components, heat shielding surfaces, and thermal break elements. Each segment contributes to overall heat reduction, allowing the system to achieve effective thermal isolation without requiring a single complex insulation structure.
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 configuration effectively reduces heat transfer to the sensor assembly, enhancing its operational lifecycle, reducing fault codes, vehicle downtime, and costs, while maintaining easy access for maintenance.
Implementation Method 1
Heat from the exhaust gas flowing through the exhaust aftertreatment components tends to transfer from the exhaust gas, through the housing, and into the sensors and modules via conduction and convention
Implementation Method 2
standoffs and air flow channels to create insulation layers and reduce conductive heat transfer
Implementation Method 3
the DOC reduces the amount of carbon monoxide and hydrocarbons present in the exhaust gas via oxidation techniques
Implementation Method 4
the SCR catalyst reduces the amount of nitrogen oxides (NOx) present in the exhaust gas
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
An exhaust aftertreatment system, comprising a first exhaust aftertreatment component; a second exhaust aftertreatment component in fluid communication with the first exhaust aftertreatment component, the first and second exhaust aftertreatment components arranged in a switch-back configuration; a first sensor table coupled to a housing of the first exhaust aftertreatment component via a remote mounting bracket, wherein the remote mounting bracket is configured to provide a space between the first sensor table and the housing, and a first sensor assembly mounted to the first sensor table.