Diesel Oxidation Catalyst Regeneration via Dynamic Fuel Dosing
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Solution Overview
Problem
Diesel engine exhaust system components, such as diesel particulate filters, face challenges in regeneration during transient vehicle operations like city stop-and-go driving, where exhaust gas temperatures do not reach optimal levels for efficient regeneration.
Innovation Solution
An electronically controlled compression ignition engine with a fuel doser and electronic control unit that monitors exhaust gas temperatures and adjusts fuel dosing based on predetermined temperature thresholds to regenerate diesel oxidation catalysts and particulate filters, ensuring effective regeneration during both normal and transient vehicle travel modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuel doser is used to supply hydrocarbon to regenerate exhaust system components, then regeneration efficiency is improved, but the system cannot effectively regenerate during transient driving conditions where exhaust temperature is insufficient
Solution Approach 1:
The patent implements dynamic control of the fuel dosing system by continuously monitoring exhaust gas temperature and adjusting fuel dosing strategy in real-time. The ECU modifies dosing rates and durations based on transient temperature conditions, allowing the system to adapt to varying driving patterns rather than using a fixed dosing schedule. This dynamic adjustment enables effective regeneration during both steady-state and transient operating conditions.
Solution Approach 2:
The system changes operational parameters (fuel dosing rate, dosing duration, and dosing timing) based on exhaust temperature measurements. By monitoring temperature parameters and adjusting fuel injection parameters accordingly, the system optimizes regeneration efficiency across different operating conditions. The ECU uses temperature thresholds to trigger different dosing strategies, effectively adapting to transient driving scenarios.
2Productivity
If exhaust gas temperature is increased to facilitate regeneration, then regeneration speed is improved, but excessive temperature may damage exhaust system components
Solution Approach 1:
The patent employs a feedback control mechanism where the ECU continuously monitors exhaust gas temperature during the regeneration process and adjusts fuel dosing in response to temperature measurements. When temperature reaches optimal levels, the system maintains dosing to sustain regeneration speed; when temperature approaches dangerous thresholds, the system reduces or terminates dosing to prevent component damage. This closed-loop feedback ensures both efficient regeneration and component protection.
Solution Approach 2:
The system uses periodic fuel dosing cycles rather than continuous dosing, allowing temperature to rise during dosing periods and cool slightly between doses. This periodic action prevents sustained excessive temperatures while maintaining adequate regeneration speed through repeated heating cycles. The ECU controls dosing duration and frequency to optimize the balance between regeneration efficiency and temperature management.
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 method ensures efficient regeneration of diesel exhaust system components by optimizing fuel dosing according to vehicle operating conditions, maintaining emissions control and vehicle performance even in transient driving scenarios.
Implementation Method 1
a fuel doser is placed in close proximity to a component, such at a diesel particulate filter or a diesel oxidation component, to supply a predetermined quantity of hydrocarbon at the appropriate times to burn off particulate matter and help regenerate the components
Implementation Method 2
diesel oxidation catalysts and other components to reduce the amount of particulate or NOx emissions out of the tailpipe
Implementation Method 3
to burn off particulate matter and help regenerate the components
Data Source
AI summary
A method to regenerate a diesel particulate filter in an exhaust system with a fuel doser for normal and transient vehicle travel. The vehicle may be equipped with an electronically controlled compression ignition engine with an electronic control unit having memory and capable of receiving data signals from remote senor indicative of vehicle operating conditions.