Meandering Ceramic Heating Element for Exhaust Gas Aftertreatment
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Solution Overview
Problem
Existing exhaust gas treatment devices with heating elements face issues of complex insulation requirements, electrical short circuits, and non-homogeneous heat distribution due to unwanted hot spots, which affect the durability and efficiency of catalytic converters.
Innovation Solution
A ceramic heating element with a meandering design, featuring electrically conductive channel walls and adjustable thermal and electrical properties through material selection and porosity, is used to distribute heat evenly across the catalytic converter's cross-section, preventing hot spots by varying cross-sectional thickness, thermal conductivity, and electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallic conductor is used in a ceramic heating disk, then electrical conductivity is achieved, but complex insulation measures are required to prevent electrical short circuits
Solution Approach 1:
The patent employs a ceramic honeycomb structure with controlled porosity to provide electrical insulation while maintaining structural integrity. The porous ceramic material allows current to flow through defined paths along the channel walls without requiring additional insulation layers, thus achieving electrical conductivity control without increasing device complexity
Solution Approach 2:
The invention uses composite ceramic materials that combine electrical conductivity and insulation properties within a single structure. The ceramic body with metallic coating or doped ceramic regions creates a composite structure where current flows through conductive paths while the surrounding ceramic provides insulation, eliminating the need for separate insulation components
2Use of energy by moving object
If current flows through the shortest path in the heating element, then electrical resistance is minimized, but hot spots occur causing non-homogeneous heat distribution
Solution Approach 1:
The patent implements local quality variations in the heating element by creating regions with different electrical resistance along the current path. The meandering channel design ensures current flows through multiple zones with varying cross-sectional areas and wall thicknesses, distributing heat generation locally throughout the structure rather than concentrating it in high-resistance spots
Solution Approach 2:
The meandering path of the heating channels introduces curvature and directional changes in the current flow path. This curved, serpentine configuration prevents straight-line current paths that would create hot spots, instead distributing current flow and heat generation more uniformly across the heating element's surface area
3Ease of manufacture
If a simple heating element design is used, then ease of manufacture is improved, but adaptability to different requirements is reduced
Solution Approach 1:
The patent enables parameter changes in the heating element design by varying channel dimensions, wall thicknesses, porosity levels, and meandering patterns without changing the fundamental manufacturing process. These parameter adjustments allow the same extrusion and cutting processes to produce heating elements with different electrical and thermal properties for various applications
Solution Approach 2:
The heating element is segmented into multiple channels and regions that can be independently configured. The meandering channel design creates discrete segments along the current path, allowing local optimization of heat distribution while maintaining a simple overall structure that can be produced using standard extrusion and cutting processes
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 provides a durable, easily producible, and efficient heating system that achieves homogeneous heat distribution, reducing the risk of hot spots and enhancing the catalytic converter's performance by optimizing current flow and heat dissipation.
Implementation Method 1
heating elements to reach at an early stage, which is referred to as the so-called light-off temperature of the catalytic converters... the heating elements are formed by electrically conductive conductor structures connected to a voltage source and which, in this way, generate heat using the ohmic resistance
Data Source
AI summary
A device for aftertreatment of exhaust gases, having a flow section which is able to be flowed through by exhaust gas and has at least one honeycomb body, acting as a catalytic converter, and has at least one heating element. The heating element is formed from a ceramic material which is able to be flowed through along a plurality of flow channels from an inflow side to an outflow side. The heating element is electrically conductive along the walls delimiting the flow channels and, by an electrical contact, is connectable to a voltage source, wherein the heating element runs in a meandering manner over a through-flowable cross section of the flow section.