Exhaust Heating Device with Elongated Electrodes
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Solution Overview
Problem
Existing exhaust gas purification devices for combustion engines require a heating element to elevate catalytic material temperatures, increasing the device's footprint and complicating integration into vehicle environments.
Innovation Solution
A heating device with elongated electrodes parallel to the longitudinal direction is integrated into the exhaust line, reducing the radial footprint by arranging electrodes on the periphery and using a metal foam or grid heating element, allowing for efficient heat transfer and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heating element is added to elevate catalytic material temperature, then catalytic conversion effectiveness is improved, but device footprint increases
Solution Approach 1:
The heating element and purification element are merged into a single integrated structure where the heating element is positioned at the center and the purification element surrounds it. This combination allows the heating function and purification function to occupy the same spatial envelope, reducing the overall device footprint while maintaining both catalytic conversion effectiveness and heating capability.
Solution Approach 2:
The heating element is nested within the purification element structure. The heating element occupies the central region while the purification element forms an outer layer around it, creating a concentric nested arrangement. This nesting strategy enables the heating component to be housed within the existing purification device boundaries without increasing the external dimensions.
2Reliability
If heating element is integrated into purification device, then heating function is improved, but device complexity increases
Solution Approach 1:
The integrated device performs multiple functions simultaneously: the heating element provides thermal energy to elevate catalytic material temperature, while the surrounding purification element conducts catalytic conversion of exhaust gases. This multi-functionality is achieved within a single unified structure, avoiding the need for separate heating device and purification device assemblies.
Solution Approach 2:
The device is segmented into distinct functional zones: a central heating element region and an outer purification element region. This segmentation allows each component to perform its specific function independently while maintaining a compact integrated structure, reducing overall device complexity compared to separate assemblies.
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
The solution effectively reduces the radial footprint of the purification device, enabling better integration and uniform heating of exhaust gases while maintaining effective catalytic conversion of NOx, CO, and hydrocarbons.
Implementation Method 1
The heating element comprises two electrical poles and two electrodes... each electrode having a generally elongated shape along a respective electrode axis
Implementation Method 2
The heating element is permeable to the exhaust gases and intended to be traversed by the exhaust gas flowing in the longitudinal direction
Implementation Method 3
intended to be traversed by the exhaust gas flowing in the longitudinal direction
Implementation Method 4
catalytic purification devices, for example to convert NOx, CO and hydrocarbons into N2, CO2 and H2O
Data Source
AI summary
A heating device comprises a heating element, permeable to the exhaust gas, and intended to be traversed by the exhaust gas flowing in a longitudinal direction. The heating element comprises two electrical poles, and two electrodes, each electrode being solidly attached to a respective electrical pole. Each electrode has a generally elongated shape along a respective elongation direction. At least one of the electrodes has a direction of elongation substantially parallel to the longitudinal direction.