Exhaust Gas Heater Electrode Layout for Uniform Cold-Start Heating
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Solution Overview
Problem
Existing exhaust gas treatment systems in motor vehicles often fail to reach the minimum temperature required for effective catalytic conversion of pollutants after a cold start or restart, and existing separate heating devices are complex and integrated with the purification system, complicating assembly and efficiency.
Innovation Solution
A separate heating device positioned upstream of the exhaust gas purification system, with electrodes extending into the central and edge regions of the heating device, supported by a frame and fastening elements, ensuring uniform heating and modular assembly, and using electrodes as mechanical fasteners for secure attachment to the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If separate heating devices are integrated with the exhaust gas purification system, then the system can reach the minimum temperature for catalytic conversion, but the assembly and disassembly become complicated
Solution Approach 1:
The heating device is segmented into distinct functional components: a heating element with first and second electrodes, a support structure with mounting brackets, and insulation layers. This segmentation allows each component to be manufactured independently and assembled in a standardized sequence, simplifying both assembly and disassembly while maintaining the temperature-raising function.
Solution Approach 2:
The heating device is pre-assembled as a complete unit with all mounting brackets, electrodes, and insulation elements in place before installation into the exhaust system. This preliminary assembly reduces on-site complexity and allows the entire heating assembly to be installed as a single module upstream of the purification device.
2Ease of manufacture
If heating devices are integrated with the purification system, then structural support is provided, but the purification system components must be heated concurrently, reducing heating efficiency
Solution Approach 1:
The heating function is extracted from the purification system and implemented as a separate, dedicated heating device positioned upstream. This extraction allows the heating elements to focus energy exclusively on the exhaust gas flow without diverting thermal energy to heat purification components, thereby improving overall heating efficiency while the purification system remains structurally independent.
Solution Approach 2:
The heating device acts as an intermediary component positioned between the exhaust source and the purification system. It pre-heats the exhaust gas to the minimum required temperature before the gas enters the purification device, ensuring that the purification components operate at optimal temperature without requiring the heating elements to directly heat them.
3Reliability
If fastening means are provided separately from electrodes, then secure mounting is achieved, but the device complexity increases
Solution Approach 1:
The mounting brackets and fastening elements are merged with the support structure of the heating device. The support structure itself serves as the mechanical mounting framework that attaches the heating elements to the exhaust system housing, eliminating the need for separate fastening components and reducing overall device complexity while maintaining secure mounting.
Solution Approach 2:
The support structure performs multiple functions simultaneously: it provides structural support for the heating elements, serves as the mounting framework for attachment to the housing, and incorporates insulation elements. This multi-functionality reduces the total number of components needed while ensuring reliable mounting and secure operation.
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 efficient, reliable, and uniform heating of exhaust gas, simplifying assembly and disassembly, and enhancing the efficiency of the exhaust gas treatment system by avoiding concurrent heating of purification system components.
Implementation Method 1
a first and a second electrode attached to the heating device and electrically contacting the heating device
Data Source
Figure 1~2
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Figure 5~7
AI summary
An exhaust gas treatment device for a motor vehicle has a housing (14) which delimits an exhaust gas duct (13) through which the exhaust gas flows, an electric heating unit (12), which extends through the exhaust gas duct (13) and through which exhaust gas flows and which comprises a heating component (20) and a carrier structure, wherein the heating component (20) is attached to the carrier structure, and a first and a second electrode (16, 18), which are attached to the heating device (12) and make electric contact with the heating device (12). The exhaust gas treatment device is characterized in that the first electrode (16) extends as far as into a central region (28) of the heating device (12), and the second electrode (18) extends as far as into an edge region (29) of the heating device (12), as seen in the exhaust gas flow direction (11) in the exhaust gas duct (13).