Modular Dosing Modules for High- and Low-Temperature Exhaust
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Solution Overview
Problem
Conventional dosers for internal combustion engines are limited to dosing exhaust at low temperatures, which hinders efficient emission reduction and requires excessive reductant usage.
Innovation Solution
A modular dosing module system with two dosers, one operating at high temperatures and the other at lower temperatures, allowing for post-turbocharger dosing and incorporating a modular design for enhanced cooling and vibration reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional dosers are used to dose exhaust, then the dosing can be performed, but only at low temperatures which hinders efficient emission reduction and requires excessive reductant usage
Solution Approach 1:
The exhaust system is divided into multiple dosing zones with separate dosing modules positioned at different locations (e.g., before and after the turbocharger). Each dosing module operates independently at its optimal temperature range, allowing the system to achieve both high-temperature and low-temperature dosing benefits without requiring excessive reductant
2Adaptability or versatility
If a single dosing module is used, then the device complexity is low, but it cannot operate efficiently at both high and low temperatures
Solution Approach 1:
The dosing system is segmented into multiple modular dosing units that can be positioned at different locations in the exhaust system. Each module is relatively simple in design but the combination provides broad temperature range adaptability
Solution Approach 2:
The dosing modules are designed with universal characteristics allowing them to function effectively across different temperature ranges and locations. The same basic module design can be deployed in multiple positions to achieve both high-temperature and low-temperature dosing functions
3Productivity
If dosing is performed at high temperatures, then emission reduction efficiency improves, but the dosing module is exposed to higher thermal stress
Solution Approach 1:
The dosing function is segmented across multiple modules positioned at different thermal environments. High-temperature dosing modules are placed where they can achieve efficient emission reduction, while low-temperature modules are positioned in cooler zones, distributing the thermal stress across the system
Solution Approach 2:
The exhaust gas flow itself acts as an intermediary cooling medium for the dosing modules. The modules are positioned to utilize the cooling effect of the passing exhaust flow, which helps manage thermal stress while maintaining the ability to dose at effective temperatures
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 efficient emission reduction with lower reductant consumption by dosing exhaust at higher temperatures, facilitating modular upgrades and serviceability.
Implementation Method 1
The dosing cartridge and the housing are structured such that the reductant is capable of flowing within an interstice between the dosing cartridge and the housing
Implementation Method 2
an SCR system may dose or otherwise introduce the reductant through a dosing module that vaporizes or sprays the reductant into an exhaust pipe of the exhaust system
Data Source
AI summary
A dosing module for an aftertreatment system includes: a housing; a dosing cartridge removably inserted in the housing, the dosing cartridge including a needle assembly; a cover coupled to the housing, the cover covering the dosing cartridge; an inlet port inserted in the housing, the inlet port configured to receive reductant and provide the reductant to the dosing cartridge; and a filter screw coupled to the inlet port such that the filter screw is interchangeable, the filter screw including a pin, the filter screw being compressible to provide compensation for fluid expansion.