Reservoir Assembly with Elevated Level Sensor and Upper Pipe Routing
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Solution Overview
Problem
Existing reservoir assemblies for motor vehicles, such as those used for urea aqueous solutions, face issues with chemical attacks on level sensors and reduced useful volume due to the placement of downstream pipes and fluid fittings, which compromise the ground clearance and measurement accuracy.
Innovation Solution
The reservoir assembly design includes a level sensor housed in a protruding portion above the ground clearance, allowing the downstream pipe and fluid connector to be positioned above the ground, maximizing the useful volume and minimizing non-measurable space, with a sealing surface inclined to ensure effective sealing and protect components from liquid contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the level sensor is immersed in the liquid of the reservoir, then it can measure the liquid level directly, but it undergoes chemical attacks due to the liquid
Solution Approach 1:
The patent introduces an intermediary mechanism (magnetic field or optical signal) that allows the level sensor to measure liquid level without direct contact with the liquid. The sensor is positioned outside the reservoir and detects liquid level through the wall using magnetic fields or optical signals, thus avoiding chemical attacks while maintaining measurement capability.
2Ease of operation
If the downstream pipe and fluid fitting are arranged lower than the bottom of the reservoir, then they are positioned for easy connection, but the useful volume of the reservoir is reduced
Solution Approach 1:
The patent repositions the downstream pipe and fluid fitting from a lower arrangement to an upper arrangement, connecting them to the upper part of the reservoir body. This dimensional change in positioning allows the components to be accessible while maximizing the useful volume of the reservoir, as the pipe no longer extends into the space that would otherwise be available for liquid storage.
3Strength
If the downstream pipe and fluid fitting are disposed under the reservoir, then they are protected from damage, but the ground clearance is reduced
Solution Approach 1:
The patent extracts the downstream pipe and fluid fitting from their traditional position under the reservoir and relocates them to the upper part of the reservoir body. This extraction from the problematic lower position eliminates the need to compromise ground clearance, while the components remain protected through alternative mounting arrangements on the reservoir structure.
4Measurement precision
If the level sensor is positioned lower in the reservoir, then measurement accuracy is improved, but the non-measurable volume below the sensor increases
Solution Approach 1:
The patent uses an intermediary detection method where the level sensor positioned outside the reservoir can detect liquid level through the wall using magnetic fields or optical signals. This allows the sensor to be positioned at the lowest feasible point for measurement accuracy without creating non-measurable volume, as the external positioning with wall penetration detection eliminates the dead zone below the sensor.
Data Source
AI summary
This reservoir assembly includes a reservoir, a liquid supply module of a downstream pipe, and a level sensor. The bottom has a first protruding portion, for housing the supply module, and a second protruding portion for defining a passage housing the downstream pipe. The level sensor is located in the housing. The bottom further has an upper area and a lower area adjacent to the housing. The upper area is defined by a top portion of the passage. The lower area is located lower than the upper area. The level sensor is in the housing at the same altitude as the lower area.