Multi-Stage Turbocharging with Parallel Turbines and EGR
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Solution Overview
Problem
Existing multi-stage turbocharged engine systems face inefficiencies at high boost production levels due to the limitations of single low-pressure turbines, particularly in achieving optimal power output and emission control.
Innovation Solution
The engine system incorporates a first exhaust turbine downstream of the engine, with second and third exhaust turbines coupled in parallel, and a valve system to selectively direct exhaust gas to optimize boost pressure by controlling the flow to each turbine, and an exhaust gas recirculation system to redirect exhaust gases back to the intake, enhancing power output and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single low-pressure turbine is used in a multi-stage turbocharger system, then the system structure is simple, but the efficiency at high boost production levels deteriorates
Solution Approach 1:
The low-pressure stage is segmented into two separate turbines (second and third exhaust turbines) instead of using a single turbine. This segmentation allows each turbine to handle a portion of the exhaust gas flow, improving overall efficiency at high boost levels while maintaining system manageability through parallel architecture.
Solution Approach 2:
The patent transitions from a single-turbine approach to a parallel multi-turbine arrangement, adding a dimensional aspect of parallel processing. This allows the system to handle higher exhaust gas volumes simultaneously, directly addressing the efficiency limitation at high boost production levels.
2Productivity
If exhaust gas is directed to multiple parallel turbines, then boost pressure efficiency improves, but the valve control complexity increases
Solution Approach 1:
The valve system dynamically adjusts exhaust gas distribution between the second and third turbines based on operating conditions. The first valve selectively directs exhaust gas to optimize boost pressure, and the second valve controls EGR flow, allowing the system to adapt to varying power demands while managing the complexity through intelligent control rather than fixed architecture.
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 improves boost pressure efficiency, increases power output, and reduces emissions by optimizing the energy transfer through the turbocharger system and controlling the recirculation of exhaust gases, allowing for efficient operation across varying power applications.
Implementation Method 1
a turbine driven by exhaust gases of the engine and a compressor driven by the turbine
Implementation Method 2
The compressor receives a fluid, typically in the form of intake air, and supplies the compressed intake air to the combustions chambers
Implementation Method 3
EGR systems operate by recirculating a portion of the exhaust produced by the engine back to the intake of the engine to mix with fresh air
Implementation Method 4
The compressor receives a fluid, typically in the form of intake air, and supplies the compressed intake air to the combustions chambers
Data Source
AI summary
An engine system is disclosed. The engine system includes an engine, an intake system for providing intake air to the engine and an exhaust system receiving exhaust gas from the engine. The engine system also includes a first exhaust turbine arranged downstream of the engine and a second and third exhaust turbines coupled in parallel and arranged downstream of the first exhaust turbine. A first valve is associated with the second and third exhaust turbines, the first valve configured to at least partially restrict exhaust gas to one of the second and third exhaust turbines and increase exhaust gas to the other turbine. The engine system also includes an exhaust gas recirculation system configured to redirect at least a portion of exhaust gas from the exhaust system to the intake system.