SCR Sensor Urea Tank Bubble Diffusion Management
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Solution Overview
Problem
The measurement accuracy of the quality sensor in an SCR sensor is degraded when the remaining amount of urea in the tank is reduced due to bubble diffusion from the drop pipe into the sensitive region of the quality sensor.
Innovation Solution
The quality sensor and drop pipe are integrated through a support, with the drop pipe positioned to direct bubbles out of the sensitive region, and the dispensing pipe is installed along the support with the quality sensor disposed at one side, ensuring that the bubble diffusion region is outside the sensitive area of the quality sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the quality sensor is installed between the bottom of the urea tank and the minimum remaining amount liquid level to measure reduced remaining urea aqueous solution amount, then the measurement range is improved, but the measurement accuracy is degraded due to bubble diffusion from the drop pipe
Solution Approach 1:
The patent positions the quality sensor horizontally offset from the drop pipe's bubble diffusion path, using lateral spatial arrangement to avoid the harmful effect zone. The sensor is placed at a position where the liquid level falls past it before bubbles reach that horizontal location, effectively using the third dimension (horizontal offset) to resolve the contradiction between measurement range and accuracy.
Solution Approach 2:
The patent introduces a horizontal offset distance as an intermediary spatial parameter between the drop pipe and quality sensor. This offset acts as a buffer zone that allows bubbles to dissipate before reaching the sensor, mediating between the need for extended measurement range and the requirement for accurate measurements.
2Ease of manufacture
If all sensors and pipes are assembled into one body (SCR sensor) to simplify assembly task, then the ease of manufacture is improved, but the device complexity increases due to integrating components with different installation position requirements
Solution Approach 1:
The patent segments the SCR sensor assembly into functional sub-components (quality sensor, level sensor, drop pipe, dispensing pipe) that are pre-positioned relative to each other on a common support structure. This segmentation allows each component to be optimized for its specific function while maintaining overall integration for simplified installation.
Solution Approach 2:
The patent merges multiple sensors and pipes onto a single integrated support structure that can be installed as one unit. The quality sensor, level sensor, drop pipe, and dispensing pipe are combined into a unified assembly that simplifies the installation process while accommodating the different spatial requirements of each component through careful structural design.
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
This configuration maintains the measurement accuracy of the quality sensor even when the urea tank is nearly empty by preventing bubbles from interfering with the sensor's operation.
Implementation Method 1
a quality sensor for measuring a quality of the urea aqueous solution
Implementation Method 2
a bubble diffusion region caused by liquid dropping from the drop pipe
Data Source
AI summary
A Selective Catalytic Reduction sensor that does not degrade a measurement accuracy of a quality sensor even when a remaining amount of a urea tank is reduced. A quality sensor is installed between a minimum remaining amount liquid level and a bottom portion of the urea tank; a drop pipe is installed from a ceiling portion of the urea tank to a top space in the urea tank; a support is installed from a bottom portion to the ceiling portion of the urea tank; the quality sensor and the drop pipe are integrated through the support; and a bubble diffusion region caused by the urea aqueous solution dropping from the drop pipe is out of a sensitive region of the quality sensor.