Integrated Dosing Unit for Reducing Agent Tank Bottom
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Solution Overview
Problem
The storage and dosing of liquid reducing agents, such as AdBlue, in vehicles with lean-burn internal combustion engines pose challenges due to freezing issues at low temperatures and the need for precise fill level determination and complete evacuation of the tank, while existing systems are costly and inefficient.
Innovation Solution
A device with a reducing agent tank featuring a separate chamber at the tank bottom for the dosing unit, which eliminates the need for an extraction pipe, allows for direct extraction and precise fill level sensing, and includes a detachable dosing unit with integrated components like pumps, sensors, and heaters to manage temperature and pressure effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated storage system and dosing system for liquid reducing agent are provided in the motor vehicle, then the reducing agent can be supplied at a defined pressure to the exhaust-gas treatment system, but the system entails considerable costs
Solution Approach 1:
The patent combines the storage tank and dosing unit into a single integrated device. The dosing unit is positioned directly on the tank bottom with direct access to the reducing agent, eliminating the need for separate storage and dosing systems. This integration reduces overall system complexity and costs while maintaining reliable reducing agent supply to the exhaust-gas treatment system.
Solution Approach 2:
The dosing unit is nested within or directly mounted on the tank bottom, with the extraction point positioned at the tank bottom. This nested configuration allows the dosing components to be housed within the storage system footprint, reducing the need for additional space and system complexity while ensuring reliable agent delivery.
2Reliability
If the reducing agent tank is designed to withstand freezing temperatures, then the tank can store AdBlue at low temperatures, but the tank construction becomes more complex and costly
Solution Approach 1:
Instead of making the entire tank complex to withstand freezing, the patent applies heating elements locally at critical points - specifically on the tank bottom where the dosing unit is positioned and at the extraction point. This localized heating approach ensures the reducing agent remains liquid where needed while avoiding the complexity and cost of designing the entire tank for extreme temperature resistance.
Solution Approach 2:
The heating elements are positioned in advance at the tank bottom and extraction point to prevent freezing before it occurs. This preliminary heating action ensures the reducing agent remains in liquid form and accessible to the dosing unit, even in cold environments, without requiring complex overall tank design modifications.
3Ease of operation
If an extraction pipe is used to deliver reducing agent from the tank, then the agent can be transported to the dosing unit, but the system requires additional components and cannot achieve complete tank evacuation
Solution Approach 1:
The patent extracts the dosing unit and positions it directly on the tank bottom, eliminating the need for an extraction pipe. The dosing unit has direct access to the reducing agent at the extraction point, simplifying the delivery mechanism while enabling complete tank evacuation as the dosing unit can operate right at the lowest point of the tank.
Solution Approach 2:
Instead of having the reducing agent travel up through an extraction pipe from the bottom to a dosing unit positioned elsewhere, the patent inverts the arrangement by positioning the dosing unit directly at the bottom where the agent is most accessible. This reversal eliminates the need for complex pipe systems and enables complete evacuation.
4Productivity
If the dosing unit is integrated directly on the tank bottom, then complete tank evacuation is possible, but the dosing unit requires protection from external factors like stone chips
Solution Approach 1:
The patent positions the dosing unit within a recess or depression in the tank bottom, creating a protective structure beforehand. This recess acts as a cushioning element that absorbs or deflects external impacts like stone chips before they can reach and damage the dosing unit components, while still allowing complete tank evacuation to occur.
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 reduces costs, ensures complete tank evacuation, and provides reliable, precise fill level determination and temperature management, ensuring efficient operation even at low temperatures.
Implementation Method 1
A heating element can be provided in the separate chamber or in the tank bottom in the region of the separate chamber
Implementation Method 2
A dosing unit is disposed within the separate chamber and is configured to extract the reducing agent from the reducing agent tank at the extraction point
Data Source
AI summary
A device for providing a liquid reducing agent includes a reducing agent tank for storing a reducing agent. The reducing agent tank has a tank bottom including a separate chamber. A dosing or metering unit extracts reducing agent from the reducing agent tank at an extraction point disposed at the separate chamber. The dosing unit is disposed within the separate chamber. A motor vehicle having the device is also provided.