Exhaust Gas Heater Electrode Layout for Uniform Cold-Start Heating
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Solution Overview
Problem
Existing exhaust gas purification devices in motor vehicles often fail to reach the required minimum temperature for effective pollutant conversion after a cold start or restart, necessitating integrated heating solutions that complicate assembly and may not heat exhaust gas efficiently.
Innovation Solution
A separate electric heating device is positioned upstream of the exhaust gas purification device, utilizing electrodes for power supply and fastening, with current flow in a radial direction to ensure uniform heating and modular design, reducing deformation and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If separate heating devices are used with electrodes and additional fasteners, then the heating function is provided, but the device complexity increases
Solution Approach 1:
The patent combines the fastening function and electrical power supply function into a single component (the electrode). The electrodes serve dual purposes: mechanically securing the heating element in place while simultaneously conducting electrical current to generate heat. This eliminates the need for separate fasteners and reduces overall device complexity.
Solution Approach 2:
The electrodes are designed to perform multiple functions simultaneously: structural support, mechanical fastening, and electrical conduction. This multi-functionality reduces the number of components needed and simplifies the overall heating device structure while maintaining effective heating capability.
2Volume of stationary object
If heating devices are integrated with exhaust gas purification devices, then space is saved, but assembly and disassembly become more difficult
Solution Approach 1:
The patent divides the exhaust gas treatment system into separate functional modules: the heating device with its electrodes and heating element is distinct from the exhaust gas purification device. This segmentation allows each module to be manufactured, tested, and assembled independently, then easily connected within the exhaust duct, simplifying the overall assembly process while utilizing available space efficiently.
3Volume of stationary object
If heating devices are positioned downstream or integrated with purification devices, then space is utilized, but heating efficiency decreases due to heating purification device material
Solution Approach 1:
The patent extracts the heating function from the purification device structure and implements it as a separate heating element within a dedicated heating device. This ensures that electrical energy is converted to heat directly in the exhaust gas flow path without being wasted on heating the mass of the purification device materials, thereby improving heating efficiency while still utilizing the available space in the exhaust system.
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 separate heating device ensures efficient and uniform heating of exhaust gas, improving the efficiency of the exhaust gas purification process by maintaining the required temperature, while allowing for easy assembly and disassembly.
Implementation Method 1
a heating component (20) and a carrier structure (16, 18, 22, 24), the heating component being attached to the carrier structure, and first and second electrodes (16, 18), which are attached to the heating device and make electrical contact with the heating device
Data Source
AI summary
An exhaust gas treatment device for a motor vehicle has a housing, which defines an exhaust gas duct through which the exhaust gas flows, and an electric heating device which extends through the exhaust gas duct and through which exhaust gas flows. The electric heating device has a heating component attached to a carrier structure, the heating component being attached to the carrier structure, and first and second electrodes which are attached to the heating device and make electrical contact with the heating device. The first electrode extends as far as into a central region of the heating device, and the second electrode extends as far as into an edge region of the heating device, as viewed in the exhaust gas flow direction in the exhaust gas duct.