Dosing Module Heat Pipe Thermal Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aftertreatment systems for internal combustion engines face challenges in maintaining the dosing module's temperature within safe limits, especially in larger vehicles where engine coolant-based cooling systems become cumbersome, leading to potential overheating and failure, which can result in increased NOx emissions or reductant slip.
Innovation Solution
Integration of a heat pipe system within the dosing module's attachment interface, utilizing a fluid such as mercury or sodium to transfer heat from a heat source to a heat sink, allowing for passive cooling and temperature regulation without relying on engine coolant, with the heat sink being part of a reductant circulating system or cooling fins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If engine coolant-based cooling systems are used for the dosing module, then the dosing module can be cooled, but the system becomes cumbersome especially in larger vehicles
Solution Approach 1:
The invention extracts the cooling function from the complex engine coolant system and implements it locally within the dosing module through integrated heat pipes. The heat pipes are embedded directly in the attachment interface, eliminating the need for external coolant lines and pumps while maintaining effective cooling of the dosing module.
Solution Approach 2:
The heat pipe system operates passively using the temperature difference between the hot attachment interface and the cooler reductant or ambient environment. The phase change of the working fluid within the heat pipes automatically transfers heat without requiring external power or control systems, making the cooling system self-regulating and simple.
2Temperature
If the dosing module operates at high temperatures, then the exhaust system can be integrated, but the dosing module may overheat and fail
Solution Approach 1:
The heat pipe system acts as an intermediary thermal management component between the hot exhaust system and the temperature-sensitive dosing module. It absorbs excess heat from the attachment interface and transfers it to the reductant or ambient environment, protecting the dosing module from overheating while maintaining integration with the exhaust system.
Solution Approach 2:
The heat pipe utilizes phase transitions of its working fluid (evaporation at the hot end and condensation at the cool end) to efficiently transfer heat away from the dosing module. This passive phase-change mechanism provides reliable thermal protection across varying operating conditions without adding complexity.
3Device complexity
If passive cooling is implemented without engine coolant, then the system becomes simpler, but temperature regulation must be achieved through alternative means
Solution Approach 1:
The invention replaces the mechanical engine coolant cooling system with a passive heat pipe system that uses thermodynamic phase changes instead of mechanical pumps and fluid circulation. This substitution maintains effective temperature regulation while dramatically reducing system complexity and eliminating the need for engine coolant infrastructure.
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
Effectively maintains the dosing module's temperature below critical limits, preventing failure and ensuring precise reductant metering and prolonged operation even at extreme temperatures, thus reducing untreated emissions and ammonia slip.
Implementation Method 1
a heat pipe system having a cavity with a fluid therein to transfer heat from a heat source to a heat sink
Implementation Method 2
The fluid transfers heat from the heat source portion to the heat sink portion
Data Source
Figure 1
Figure 2~4
Figure 5~6
AI summary
A dosing module for an exhaust aftertreatment system includes an attachment interface for coupling to an exhaust system. The attachment interface includes a heat pipe system that includes a cavity encasing a fluid. The cavity has a heat source portion thermally coupled with a portion of the attachment interface and a heat sink portion thermally coupled with a cooling system. The fluid transfers heat from the heat source portion to the heat sink portion.