Bypassing Turbocharger Compressor in Treated EGR Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing internal combustion engine EGR systems face challenges in reducing emissions while maintaining engine performance, as they often lead to increased fuel consumption and reduced turbocharger performance due to the recirculation of exhaust gases through compressors, which degrade the beneficial constituents of treated exhaust gas.
Innovation Solution
The system recirculates treated exhaust gas directly to the engine intake manifold without passing through the compressor, preserving reactive oxygen species and other beneficial constituents, thereby enhancing combustion efficiency and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If exhaust gas is recirculated through the compressor of the turbocharger, then the exhaust gas pressure is increased to facilitate recirculation, but the beneficial reactive constituents of the exhaust gas are degraded and fuel consumption increases
Solution Approach 1:
The patent extracts the harmful compression step from the EGR system by providing a separate recirculation path that bypasses the turbocharger compressor. This allows the exhaust gas to be recirculated without undergoing compression, thereby preserving its beneficial reactive constituents and avoiding the energy loss associated with compressing already pressurized exhaust gas.
Solution Approach 2:
The patent segments the exhaust gas flow path into two separate routes: one through the turbocharger compressor for normal exhaust flow, and another separate recirculation path that bypasses the compressor. This segmentation allows selective recirculation of exhaust gas without compromising the turbocharger's compression function while avoiding degradation of exhaust gas constituents.
2Quantity of substance
If exhaust gas is recirculated through the compressor, then recirculation is achieved, but turbocharger performance is reduced
Solution Approach 1:
The patent divides the exhaust gas flow into separate paths: the main flow through the turbocharger compressor for normal operation, and a separate recirculation path that bypasses the compressor. This segmentation prevents the recirculation flow from interfering with the turbocharger's compression performance while still achieving the desired EGR effect.
Solution Approach 2:
The patent removes the recirculation function from the turbocharger compressor by providing a dedicated bypass path. This extraction of the recirculation function allows the turbocharger to operate at full performance without the burden of compressing recirculated exhaust gas, which would otherwise reduce its efficiency.
3Object-generated harmful factors
If exhaust gas is recirculated to reduce emissions, then NOx emissions are reduced, but engine performance deteriorates due to increased fuel consumption
Solution Approach 1:
The patent extracts the compression step from the EGR process, allowing exhaust gas to be recirculated without energy-intensive compression. This maintains the emission reduction benefits of EGR while eliminating the penalty of increased fuel consumption that results from compressing recirculated exhaust gas.
Solution Approach 2:
The patent changes the pressure parameter of the recirculated exhaust gas by providing a bypass path that avoids the compressor. This results in recirculation of exhaust gas at lower pressure, which reduces the energy required for recirculation and thereby reduces fuel consumption while still achieving emission control.
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 improves engine performance by reducing fuel consumption, lowering NOx emissions, and enhancing combustion efficiency, while maintaining the activity of reactive constituents in the treated exhaust gas, resulting in better fuel economy and reduced greenhouse gas emissions.
Implementation Method 1
a first treated EGR line (120) recirculating the treated exhaust gas to the engine intake manifold (11) in a manner that preserves the activity of the constituents of the treated exhaust gas
Data Source
AI summary
Systems and methods for treated exhaust gas recirculation (EGR) for an internal combustion engine are disclosed. The internal combustion engine has an exhaust manifold discharging exhaust gas and an intake manifold receiving forced air from a compressor. One or more exhaust treatment devices treat the exhaust gas and produce a treated exhaust gas. The EGR system includes an EGR line downstream of the one or more exhaust treatment devices and connected to the engine intake line downstream of the compressor, wherein the treated EGR line recirculates the treated exhaust gas to the intake manifold of the engine without passing through the compressor.