Engine Exhaust Segmentation for Pressure Interference
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Solution Overview
Problem
Existing engine systems with turbochargers and exhaust gas recirculation (EGR) systems face challenges in efficiently managing exhaust pressure events across multiple cylinders, leading to interference and reduced mechanical and emissions performance.
Innovation Solution
The engine system incorporates a dedicated EGR cylinder and a turbocharger with turbine inlet ports that are isolated from each other, utilizing a network of exhaust passages to separate and manage exhaust pressure events, allowing for independent delivery of exhaust gases from different cylinders to the turbine, thereby preventing overlap and optimizing pressure dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If exhaust passages from multiple cylinders are combined into a single system, then device complexity is reduced, but exhaust pressure events from different cylinders interfere with each other, reducing mechanical performance and emissions efficiency
Solution Approach 1:
The exhaust system is segmented into separate isolated passages for different cylinders, with each passage delivering exhaust gases to separate turbine inlet ports. This segmentation prevents exhaust pressure events from different cylinders from interfering with each other, thereby resolving the contradiction between device complexity and reliability.
2Object-generated harmful factors
If a dedicated EGR cylinder is implemented, then emissions efficiency is improved through controlled exhaust gas recirculation, but device complexity increases due to additional cylinder configuration
Solution Approach 1:
The dedicated EGR cylinder serves multiple functions: it provides exhaust gases for the EGR system to control emissions, and simultaneously contributes to turbocharger operation through its isolated exhaust passage. This multi-functionality reduces the need for additional separate components, thereby mitigating the increase in device complexity while improving emissions efficiency.
3Device complexity
If exhaust gases from multiple cylinders are delivered to the same turbine inlet port, then device complexity is reduced, but back pressure increases and pressure profile consistency deteriorates
Solution Approach 1:
The turbine inlet is segmented into multiple separate inlet ports, each receiving exhaust gases from a dedicated cylinder through an isolated passage. This segmentation eliminates exhaust pressure event interference and maintains consistent pressure profiles, resolving the contradiction between device complexity and back pressure 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
This configuration enhances mechanical performance and emissions efficiency by ensuring independent delivery of exhaust gases, reducing back pressure and maintaining a consistent pressure profile, which can lead to improved engine efficiency and reduced emissions.
Implementation Method 1
a turbocharger having a turbine with a plurality of inlet ports to the turbine
Implementation Method 2
delivering exhaust gases from a second cylinder of the plurality of combustion cylinders to a first inlet port of the plurality of inlet ports of the turbine; and delivering exhaust gases from a third cylinder of the plurality of combustion cylinders to a second inlet port of the plurality of inlet ports of the turbine
Data Source
AI summary
A unique engine system has an engine with a dedicated exhaust gas recirculation cylinder, an EGR system that receives exhaust gas from the dedicated cylinder, and a turbocharger having turbine inlet ports in fluid communication with other engine cylinders via a plurality of exhaust passages. At least two of the exhaust passages are substantially isolated from each other. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for engines and engine systems.