Rear Reducing Agent Tank for Commercial Vehicle SCR Systems
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Solution Overview
Problem
Commercial vehicle exhaust gas aftertreatment systems face space constraints and limited capacity for urea-water tanks due to their typical location between side members and in front of the end cross member, restricting the amount of reducing agent that can be stored.
Innovation Solution
The reducing agent tank is relocated to the rear of the vehicle, allowing for increased capacity and space utilization, with the tank designed to protrude beyond the end cross member and adapt to trailer geometries, incorporating features like recesses for rear lights and license plates, and connected to an SCR catalytic converter for efficient selective catalytic reduction of nitrogen oxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the reducing agent tank is placed between the side members and in front of the end cross member, then the installation space is utilized according to conventional design, but the capacity of the reducing agent tank is limited
Solution Approach 1:
The reducing agent tank is extracted from its conventional location between the side members and in front of the end cross member, and relocated to the rear of the motor vehicle behind the end cross member. This extraction from the constrained space allows the tank to achieve significantly increased capacity without limiting the installation space between side members for other components.
2Quantity of substance
If the reducing agent tank capacity is increased, then more reducing agent can be stored, but the installation space between side members is reduced
Solution Approach 1:
The reducing agent tank is extracted from the space between side members and relocated to the rear of the vehicle. This allows the tank capacity to be increased to store more reducing agent while the installation space between side members remains fully available for other commercial vehicle components.
Solution Approach 2:
Instead of increasing tank capacity within the constrained horizontal space between side members, the tank is relocated to the rear of the vehicle where it can extend in multiple dimensions (length, width, height) without interfering with the installation space between side members. The tank may protrude beyond the end cross member in width and extend vertically, utilizing three-dimensional space at the rear of the vehicle.
3Quantity of substance
If the reducing agent tank is arranged at the rear of the motor vehicle, then the capacity of the reducing agent tank can be increased, but the tank must protrude beyond the end cross member
Solution Approach 1:
The reducing agent tank is extracted from the conventional installation location and positioned at the rear of the motor vehicle, allowing it to protrude beyond the end cross member in the longitudinal direction. This extraction enables increased tank capacity while the end cross member maintains its structural function as part of the frame support structure.
Solution Approach 2:
The end cross member and/or rear end section of the longitudinal member construction are accommodated within a recess in the reducing agent tank. This nesting arrangement allows the tank to protrude beyond the end cross member while integrating the structural components within the tank's recess, creating a compact rear-end configuration.
4Quantity of substance
If the reducing agent tank is shaped to adapt to trailer geometry, then the capacity is maximized, but the design complexity increases
Solution Approach 1:
The reducing agent tank is given different local qualities in terms of its geometry to adapt to specific functional requirements. The tank features a recess at the rear for accommodating the end cross member and rear light arrangement, and may have reduced sections at the bottom to adapt to embankment geometry. These localized geometric variations maximize capacity while maintaining a relatively simple overall tank 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 maximizes the capacity of the reducing agent tank, optimizing space usage and enabling larger storage volumes while maintaining the functionality of the exhaust gas aftertreatment system, enhancing the vehicle's ability to perform selective catalytic reduction effectively.
Implementation Method 1
exhaust gas aftertreatment system that is based on a so-called selective catalytic reduction (SCR) of nitrogen oxides
Data Source
Figure 1
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Figure 4
AI summary
The invention relates to a motor vehicle (1), preferably a truck or a semi-trailer tractor. The motor vehicle (1) comprises an exhaust aftertreatment system and a reducing agent tank (2) for receiving a reducing agent and is characterized in particular by the fact that the reducing agent tank (2) is arranged at the rear of the motor vehicle (1). The invention also relates to a reducing agent tank (2) with at least one device (5, 6) for a rear light assembly and/or a vehicle registration plate.