Diesel Exhaust Fluid Tank Venting System
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Solution Overview
Problem
Diesel exhaust fluid (DEF) tanks in agricultural vehicles face challenges in filling due to limited space, leading to increased fill time and potential evaporation of the aqueous urea solution, which affects the catalytic reaction, as traditional filling methods either block gas escape or expose the solution to evaporation.
Innovation Solution
A DEF tank design with a venting system that allows gases to escape through a conduit while filling, using a single cap to control the flow of both gas and liquid, reducing evaporation and clogging risks by angling the vent components and using baffles to prevent urea entry into the vent conduit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional filling methods are used to fill DEF tanks through limited space, then filling can be completed, but gas escape is blocked causing increased fill time and potential evaporation
Solution Approach 1:
The filling system is segmented into separate functional pathways: a liquid conduit for DEF injection and a vent conduit for gas escape. This segmentation allows simultaneous liquid filling and gas venting, eliminating the time loss caused by blocked gas escape in traditional single-pathway systems.
Solution Approach 2:
A vent system acts as an intermediary pathway that facilitates gas escape during the filling process. The vent conduit with its inlet in the tank housing and outlet in the liquid conduit provides a dedicated route for gas to exit, preventing pressure buildup and enabling continuous efficient filling.
2Productivity
If traditional filling methods are used, then filling can be completed, but evaporation of aqueous urea solution occurs affecting catalytic reaction
Solution Approach 1:
The vent system serves as an intermediary that channels gas escape away from the liquid surface. By positioning the vent inlet below the liquid level and directing gas flow through the liquid conduit, the system prevents direct exposure of the urea solution to atmospheric conditions, thereby minimizing evaporation and maintaining solution concentration for effective catalytic reaction.
Solution Approach 2:
The venting mechanism creates a controlled environment during filling by directing gas flow through the liquid conduit rather than allowing direct atmospheric contact. This effectively creates an inert pathway that protects the aqueous urea solution from evaporation, preserving the chemical composition necessary for catalytic function.
3Productivity
If venting system is added to facilitate filling, then gas escape is enabled, but device complexity increases
Solution Approach 1:
The vent system is merged with the existing liquid conduit structure. The vent outlet is positioned within the liquid conduit, and both systems share the same cap assembly. This integration allows the venting function to be added without requiring entirely separate infrastructure, thereby limiting the increase in device complexity while achieving improved filling efficiency.
Solution Approach 2:
The cap assembly serves multiple functions: it seals the liquid conduit inlet, controls liquid flow, and manages vent flow through integrated valves or openings. This multi-functionality reduces the need for additional separate components, minimizing the increase in device complexity while enabling both filling and venting operations.
4Ease of operation
If single cap controls both gas and liquid flow, then ease of operation improves, but risk of clogging increases
Solution Approach 1:
Different sections of the cap assembly have specialized local qualities: the liquid pathway includes filters or mesh screens to prevent urea crystal clogging, while the vent pathway has larger openings optimized for gas flow. This localized differentiation allows simple single-cap operation while mitigating clogging risks through targeted design features in critical areas.
Solution Approach 2:
The cap assembly incorporates adjustable parameters such as valve openings or flow restrictors that can be modified based on operating conditions. This allows optimization of flow characteristics to prevent clogging while maintaining ease of operation, as the system can adapt to different filling rates and gas volumes without requiring complex multi-component control systems.
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
Facilitates efficient filling of the tank through a side surface while minimizing evaporation of the aqueous urea solution, maintaining the chemical ratio essential for the catalytic reaction and preventing clogging, thus optimizing the use of space and operational efficiency.
Implementation Method 1
The vent discharges gas from the housing into the conduit
Implementation Method 2
The conduit guides liquid from a fluid source into the cavity
Implementation Method 3
the DEF is injected into the exhaust line where it catalytically reduces nitrogen oxides into water and nitrogen
Data Source
AI summary
A fluid tank that includes a housing. The housing includes a bottom wall, a top wall, and a side wall. The side wall couples the bottom wall to the top wall to define a cavity that receives and houses a liquid. A conduit guides liquid from a fluid source into the cavity. The conduit defines an inlet and an outlet. The outlet couples to the side wall. A vent coupled to the housing and to the conduit. The vent defines a vent inlet coupled to the housing and a vent outlet coupled to the conduit. The vent discharges gas from the housing into the conduit.