Dosing Module Cooling for High-Temperature Exhaust
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dosing modules for reducing agents in internal combustion engines are not adequately cooled for high ambient temperatures, risking damage to electrical components and plug connections due to partial cooling, limiting their operational range to below 160°C.
Innovation Solution
A completely water-cooled dosing module with a base heat sink and an additional heat sink, utilizing a guide insert for optimized cooling of the injection valve and components like the electromagnet and plug connection, ensuring effective cooling across the dosing module even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dosing module is positioned close to the exhaust flow for effective NOx reduction, then the cooling requirement increases, but the electrical components and plug connections are damaged due to excessive heat
Solution Approach 1:
The dosing module is divided into two separate cooling zones: a first cooling zone for the injection valve and a second cooling zone for the electrical plug connection and electromagnet. This segmentation allows differential cooling strategies to be applied to components with different thermal requirements, enabling the module to operate reliably at high exhaust temperatures while protecting temperature-sensitive electrical components from damage
Solution Approach 2:
Different cooling intensities are applied to different regions of the dosing module. The first cooling zone provides intensive cooling for the injection valve which is exposed to high temperatures, while the second cooling zone provides appropriate cooling for the electrical components. This local differentiation of cooling quality allows the module to withstand high ambient temperatures without damaging electrical components
2Device complexity
If only partial cooling is provided for the dosing module, then the structure is simpler, but the electrical components and plug connections suffer permanent damage at temperatures above 160°C
Solution Approach 1:
The cooling system is segmented into two distinct cooling zones with separate cooling channels. The first cooling zone cools the injection valve through channels in the injection valve body, while the second cooling zone cools the electrical components through separate channels. This segmentation enables comprehensive cooling coverage without requiring a single complex cooling structure, achieving both simplicity and reliability
Solution Approach 2:
The cooling system serves multiple functions simultaneously: it cools the injection valve to prevent thermal damage and maintains proper injection valve operation, cools the electrical plug connection and electromagnet to prevent permanent damage, and enables the dosing module to operate at ambient temperatures above 160°C. This multi-functionality is achieved through the two-zone cooling approach
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
Enables the dosing module to operate reliably at ambient temperatures of 160°C or higher by prioritizing cooling of the injection valve while actively cooling the electromagnet and plug connection, preventing permanent damage and ensuring continuous functionality.
Implementation Method 1
a base heat sink (12) which is cooled by a cooling fluid for cooling an injection valve (64) for the reducing agent flows through
Implementation Method 2
an additional heat sink (14), also permeated by cooling fluid, is placed on the base heat sink (12) for cooling in the area of an electrical plug connection (22) and an electromagnet (80)
Implementation Method 3
with a guide insert (30) for the cooling fluid being arranged in the base heat sink (12)
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a dosing module (10) for injecting a reduction agent, in particular a urea-water solution, into an exhaust pipe of an internal combustion engine, in particular of a self-igniting internal combustion engine, to reduce nitrogen oxides in the exhaust stream, wherein the dosing module has a main cooling element (12) through which a cooling liquid flows, in particular for cooling an injection valve (64) for the reduction agent. According to the invention, an additional cooling element (14), through which the cooling liquid likewise flows, in particular for cooling in the region of an electrical plug connection (22) and of an electromagnet (80) for actuating the injection valve (64), is placed on the basis cooling element (12), wherein a guide insert (30) for the cooling liquid is arranged in the main cooling element (12). As a result of the guide insert (30), priority cooling of the end section (72) of the injection valve (64) which is in direct contact with the hot exhaust stream of the internal combustion engine occurs. According to the invention, reliable operation of the dosing module (10) is ensured, even at ambient temperatures of 160°C and above.