Integrated Exhaust Pulse Converter for Turbocharger
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Solution Overview
Problem
Pulse turbocharging systems face inefficiencies due to unsteady exhaust gas flow and interference between cylinder banks, leading to lower turbine efficiency and increased engine pumping losses, which are exacerbated by the added complexity and thermal losses from separate pulse converters.
Innovation Solution
An integrated exhaust pulse converter is incorporated into the turbine housing, which accelerates and decelerates exhaust gas streams to minimize cross-talk and wall friction losses, reducing engine pumping losses and thermal mass while improving packaging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separate pulse converter is added to the exhaust system, then cross-talk between cylinder banks is reduced, but device complexity and thermal losses increase
Solution Approach 1:
The pulse converter functionality is merged with the turbine housing by integrating a mixing portion directly into the turbine housing structure. This eliminates the need for a separate pulse converter component while maintaining the cross-talk reduction benefit. The mixing portion is fluidly coupled to receive exhaust gas streams from multiple cylinder banks and deliver them to the turbine, achieving pulse converter functionality within the existing turbine housing boundaries.
2Object-affected harmful factors
If a separate pulse converter is added to the exhaust system, then cross-talk between cylinder banks is reduced, but thermal mass increases
Solution Approach 1:
The pulse converter and turbine housing are merged into a single integrated structure. The mixing portion is formed as an integral part of the turbine housing, eliminating the additional thermal mass that would result from a separate pulse converter component. This integration maintains the exhaust gas flow separation benefits while minimizing unnecessary thermal mass accumulation.
3Volume of stationary object
If exhaust gas streams from multiple cylinder banks are mixed early, then packaging space is reduced, but cross-talk increases
Solution Approach 1:
The mixing portion is positioned downstream of the turbine inlet, allowing exhaust gas streams from multiple cylinder banks to be separated at the turbine inlet first. The mixing occurs after the exhaust gases have already performed their useful work driving the turbine, at which point cross-talk is minimized. This preliminary separation before mixing resolves the contradiction by preventing harmful cross-talk while still achieving compact packaging.
4Power
If the exhaust system uses unsteady exhaust gas flow from multiple cylinder banks, then turbocharging is achieved, but turbine efficiency decreases
Solution Approach 1:
The exhaust system is segmented into separate flow paths for different cylinder banks, with each path delivering exhaust gas to the turbine inlet separately. The mixing portion is positioned downstream of the turbine inlet, allowing the turbine to receive well-defined, non-crossing exhaust pulses that maximize energy conversion efficiency. This segmentation prevents the unsteady, cross-talking flow patterns that reduce turbine efficiency while maintaining the power benefits of multi-cylinder exhaust energy utilization.
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 integrated pulse converter enhances turbine efficiency by reducing cross-talk and thermal losses, allowing for more efficient energy delivery to the turbocharger and improved engine performance with reduced packaging space and complexity.
Implementation Method 1
the nozzle of the mixing device accelerates flow of the first exhaust gas stream and reduces a pressure of the first exhaust gas stream so as to minimize cross-talk from the second exhaust gas stream
Implementation Method 2
The diffuser of the turbine decelerates flow of the first and second exhaust gas streams so as to minimize wall friction flow losses of the first and second exhaust gas streams
Implementation Method 3
The turbine converts some of the energy contained in the hot exhaust gas into mechanical work to drive the compressor
Implementation Method 4
The compressor compresses intake air before it enters the intake manifold. This improves the engine's volumetric efficiency by increasing the density of the charge air
Data Source
AI summary
An exhaust system includes an exhaust manifold structured to be fluidly coupled to an engine. A turbocharger including a turbine housing is fluidly coupled to the exhaust manifold. An exhaust pulse converter includes a first portion integral to the exhaust manifold and a second portion integral to the turbine housing. The exhaust pulse converter is structured to reduce engine pumping losses by reducing cross-talk of exhaust blowdown events from the engine.