Diesel Particulate Filter Placement for Passive Regeneration
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Solution Overview
Problem
Existing diesel particulate filter regeneration methods require additional fuel and equipment to elevate exhaust gas temperatures, reducing efficiency and increasing costs, and necessitate active monitoring and intermittent regeneration cycles.
Innovation Solution
The diesel particulate filter is positioned between the engine exhaust outlet and the turbocharger turbine, leveraging continuous heat from engine exhaust for regeneration, eliminating the need for fuel injection and supplemental equipment, and allowing for improved exhaust gas recirculation and homogeneous gas mixture formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active regeneration methods are used to burn off particulates in the DPF, then particulate trapping efficiency is maintained, but additional fuel and equipment are required, reducing overall efficiency and increasing costs
Solution Approach 1:
The DPF is positioned to receive hot exhaust gas directly from the engine exhaust outlet, allowing it to self-regenerate using the engine's own exhaust heat without requiring external fuel injection or additional active regeneration equipment. The system uses its own operational byproduct (hot exhaust) to maintain itself.
Solution Approach 2:
The DPF is placed upstream in the exhaust flow path, before the turbocharger turbine, so that it continuously receives hot exhaust gas that pre-heats the filter and maintains temperatures suitable for passive regeneration during normal engine operation.
2Reliability
If active regeneration is initiated to burn off trapped particulates, then DPF effectiveness is maintained, but additional fuel must be spent to produce heat, reducing overall efficiency
Solution Approach 1:
The DPF utilizes the engine's own hot exhaust gas to regenerate trapped particulates, eliminating the need for additional fuel injection. The system converts waste exhaust heat into a useful regeneration resource, requiring no extra energy input beyond normal engine operation.
Solution Approach 2:
The hot exhaust gas, which would otherwise be wasted heat energy, is utilized to regenerate the DPF. The exhaust flow that would normally just exit the system is now put to productive use, burning off particulates without requiring additional fuel consumption.
3Object-generated harmful factors
If the DPF is positioned downstream of the DOC with traditional regeneration methods, then particulate trapping occurs, but intermittent active regeneration cycles are required, necessitating monitoring and control systems
Solution Approach 1:
By positioning the DPF upstream to receive continuous hot exhaust gas flow, passive regeneration occurs continuously during normal engine operation rather than requiring intermittent active regeneration cycles. The continuous heat supply maintains constant burning conditions without needing periodic intervention.
4Reliability
If supplemental equipment such as fuel injection apparatus is added to enable active regeneration, then regeneration capability is achieved, but device complexity and cost increase
Solution Approach 1:
The system uses the engine's existing hot exhaust gas to regenerate the DPF, eliminating the need for supplemental fuel injection apparatus, temperature sensors, or active regeneration control systems. The exhaust flow itself provides both the heat and the oxygen needed for regeneration.
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
This approach reduces costs, enhances engine efficiency, and transforms active regeneration into passive, continuous particulate burning, minimizing emissions and eliminating the need for additional equipment and monitoring.
Implementation Method 1
burn off trapped particulates whose unchecked accumulation would otherwise impair DPF effectiveness
Implementation Method 2
The heat needed for DPF regeneration may come directly from the engine exhaust during normal operation
Implementation Method 3
a diesel oxidation catalyst (DOC) that oxidizes hydrocarbons (HC) to CO2 and H2O and converts NO to NO2
Implementation Method 4
a turbine of an engine turbocharger
Implementation Method 5
it is known to use exhaust gas recirculation (EGR) to re-circulate exhaust gas back into the cylinders. Exhaust gas recirculation reduces the amount of excess oxygen and lowers the peak combustion temperature of the engine
Data Source
AI summary
An engine system for a combustion engine that has an intake manifold and an exhaust manifold has a turbine having a turbine inlet for receiving exhaust gas and a turbine outlet for discharging exhaust gas, and a diesel particulate filter (DPF) having a DPF inlet in flow-communication with the exhaust manifold and a DPF outlet in flow-communication with the turbine inlet. The exhaust at the exhaust manifold has a sufficiently high temperature to maintain passive regeneration of the DPF during normal operating conditions. If the engine system includes an exhaust gas recirculation (EGR) system, the EGR inlet is in flow-communication with the DPF outlet, and an EGR outlet is in flow-communication with the intake manifold. High pressure, high temperature, filtered EGR gas is available for EGR recirculation.