Diesel Exhaust Fluid Tank Baffle for Sensor Accuracy
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Solution Overview
Problem
Diesel engines emit nitrogen oxides, which combine with volatile organic compounds to form smog, requiring effective reduction methods like selective catalytic reduction (SCR) using diesel exhaust fluid (DEF), but existing systems face challenges in accurate fluid management and contamination detection.
Innovation Solution
An exhaust gas purification system with a tank, baffle, and conduits for precise DEF delivery and return, incorporating sensors for condition detection and fluid concentration measurement, with the return conduit extending through the baffle to prevent air and temperature interference, ensuring accurate readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the return conduit discharges fluid into the tank without extending through the baffle, then the structure is simpler, but air and temperature interference affect sensor accuracy
Solution Approach 1:
The baffle acts as an intermediary structure that separates the return fluid discharge location from the sensor measurement zone. The return conduit extends through the baffle to discharge fluid below the opening, preventing direct mixing of return fluid with the sensor cavity, thereby protecting sensor accuracy while maintaining a relatively simple overall structure.
Solution Approach 2:
The tank interior is segmented by the baffle into distinct zones: a sensor zone (interior cavity above the baffle opening) and a return fluid discharge zone (below the opening). This segmentation prevents air and temperature interference from the return conduit from affecting the sensor, improving measurement precision without requiring complete structural redesign.
2Reliability
If the baffle structure is added to separate fluid zones, then sensor protection from contamination is improved, but tank space and structural complexity increase
Solution Approach 1:
The baffle divides the tank interior into functionally distinct zones without requiring a complete internal restructuring. The segmentation creates a protected sensor cavity and a separate return fluid discharge area, improving reliability of fluid management while occupying minimal additional space within the existing tank volume.
Solution Approach 2:
The baffle provides localized protection and separation only where needed (around the sensor cavity and return conduit discharge point) rather than requiring complete tank redesign. This localized approach improves fluid management accuracy while minimizing impact on overall tank space utilization.
Data Source
AI summary
An exhaust gas purification system includes a tank for storing a fluid and a mounting plate coupled to the tank. A baffle is positioned inside the tank below the mounting plate. The baffle has an outer wall defining an interior cavity and an opening. A sensor is positioned in the interior cavity for detecting a condition of the fluid. A supply conduit extends through the mounting plate into the tank. A return conduit extends through the mounting plate into the tank and has an outlet positioned to discharge a return fluid below the opening and exterior to the baffle and the interior cavity.