Diesel Dosing Module for Particulate Filter Regeneration
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Solution Overview
Problem
Current diesel emission control systems face challenges in maintaining the high temperatures required for continuous regeneration of diesel particulate filters, as the temperatures of diesel oxidation catalysts and particulate filters may not always be optimal, leading to reduced emission control efficiency and increased exhaust backpressure.
Innovation Solution
A diesel dosing module that precisely delivers finely atomized fuel upstream of the diesel oxidation catalyst, utilizing an exothermic chemical reaction to maintain optimal temperatures and employing a closed-loop control system with electronic control units to manage fuel and air delivery, ensuring continuous regeneration of the particulate filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a diesel particulate filter is operated at low temperature, then its capacity becomes finite and exhaust backpressure increases, but maintaining high temperature requires additional energy input and complex control systems
Solution Approach 1:
The system uses the engine's own exhaust heat to maintain the diesel particulate filter temperature, eliminating the need for external heating systems. The close coupling of the diesel oxidation catalyst and diesel particulate filter allows thermal energy to be transferred from the catalyst to the filter, enabling self-sustained high temperature operation without additional energy input or complex control mechanisms.
2Adaptability or versatility
If the diesel oxidation catalyst temperature is engine load dependant, then the system adapts to varying engine conditions, but the diesel particulate filter temperature may not always be at optimum for continuous regeneration
Solution Approach 1:
The diesel oxidation catalyst and diesel particulate filter are closely coupled and merged into a single integrated assembly. This merging allows the catalyst to continuously transfer thermal energy to the filter, ensuring the filter maintains optimal temperature for continuous regeneration regardless of engine load variations. The combined structure ensures that the filter always receives sufficient heat from the catalyst to sustain regeneration operations.
3Reliability
If the diesel particulate filter runs at high temperature of 450 to 700°C, then it achieves infinite capacity and converts particulate matter effectively, but vehicle performance is inhibited if temperature is too low due to increased exhaust backpressure
Solution Approach 1:
The system performs preliminary oxidation of hydrocarbons and carbon monoxide in the diesel oxidation catalyst before the exhaust gases reach the diesel particulate filter. This preliminary action generates heat in advance that is then transferred to the filter, ensuring the filter is already at the required high temperature (450-700°C) for effective particulate matter conversion, thereby preventing exhaust backpressure buildup from the outset.
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
The diesel dosing module effectively maintains the required high temperatures for continuous regeneration of the diesel particulate filter, enhancing emission control efficiency and reducing backpressure, thereby meeting stringent emission regulations.
Implementation Method 1
utilizing an exothermic chemical reaction to maintain optimal temperatures
Data Source
AI summary
A diesel dosing module utilizes a diesel fuel shut-off valve, a diesel fuel dosing valve to provide dosing fuel to the inlet of a diesel oxidation catalyst and an air purge valve to purge fuel from a dosing line attached to the diesel dosing module and from a nozzle attached to a distal end of the dosing line. The valves are attached to a housing manifold which is remotely positionable from the nozzle and the high heat areas of the vehicle.