Integrated Thermal Insulation in Automotive Urea Tank Walls
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Solution Overview
Problem
Aqueous urea solutions used in motor vehicles for reducing nitric oxides in exhaust gases have a high freezing point, causing mechanical stress on storage tanks, which can burst due to expansion, and existing insulation solutions are complex and costly to manufacture and assemble.
Innovation Solution
An automotive service liquid tank with integrated locally enhanced thermal insulation in the tank wall, achieved through varying thickness, thermal conductivity, or multi-walled structures, eliminating the need for separate insulation elements and reducing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate insulation elements are mounted on the tank, then thermal insulation is provided, but manufacturing and assembly complexity increases
Solution Approach 1:
The patent merges the insulation function directly into the tank wall structure by creating an integrated multi-layer wall design. The tank wall comprises an inner wall, outer wall, and insulation layers with thermal barriers, eliminating the need for separate insulation elements that would need to be mounted on the tank. This integration resolves the contradiction by providing effective thermal insulation while simplifying manufacturing and assembly processes.
Solution Approach 2:
The tank wall is segmented into multiple functional layers including inner wall, insulation layers, thermal barriers, and outer wall. Each layer serves a specific function: the inner wall contains the service liquid, insulation layers provide thermal resistance, thermal barriers prevent ice formation, and the outer wall provides structural protection. This segmentation allows the insulation system to be built into the tank wall structure itself during manufacturing, avoiding complex post-assembly of separate insulation elements.
2Reliability
If insulation elements are mounted separately, then thermal insulation is achieved, but production time increases
Solution Approach 1:
The insulation structure is preliminarily integrated into the tank wall during the manufacturing process rather than being added later. The multi-layer wall structure with insulation layers and thermal barriers is formed as part of the tank fabrication, allowing the thermal insulation function to be built in advance. This preliminary action resolves the contradiction by achieving effective insulation while maintaining high manufacturing efficiency without requiring separate mounting operations.
3Ease of manufacture
If uniform tank wall thickness is used, then manufacturing is simplified, but freezing protection in critical regions is insufficient
Solution Approach 1:
The patent applies local quality by providing enhanced insulation specifically in regions where freezing protection is critical. The thermal barriers and insulation layers are strategically positioned at locations prone to freezing, such as lower portions of the tank or areas with higher heat loss. This allows the tank wall manufacturing to remain relatively simple while providing targeted freezing protection where it is most needed, resolving the contradiction between manufacturing simplicity and protection effectiveness.
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 integrated thermal insulation delays freezing in critical regions, reducing mechanical stress on the tank and preventing bursting, while simplifying production and assembly, thus enhancing operational efficiency and safety.
Implementation Method 1
the tank wall is provided with locally enhanced thermal insulation where it is needed... to prevent locally any thermal passage from the inside of the tank to the outer environment of the tank
Data Source
AI summary
An automotive service liquid tank for receiving a service liquid of a motor vehicle, in particular an aqueous urea solution, has a tank wall that encloses a tank volume on the inside of the tank, wherein the tank has locally, by comparison with at least one other tank region, at least one region with enhanced thermal insulation, in order to influence a freezing behavior of the service liquid received in the tank in such a way that the service liquid, when the outside temperature drops, freezes later in the tank region with enhanced thermal insulation than in the at least one other tank region without enhanced thermal insulation. According to the invention it is provided that the enhanced thermal insulation is formed integrally with the tank wall.