Turbocharger Turbine with Adjustable Bypass for Mass Flow Control
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Solution Overview
Problem
Exhaust gas turbochargers face limitations in mass flow capacity and efficiency, leading to restricted engine power output and increased emissions, particularly due to stringent emission regulations and the need for high exhaust gas recirculation rates, which require smaller turbine dimensions and reduced mass flow capacity.
Innovation Solution
A turbine design with a movable blocking member and adjustable bypass duct allows for variable mass flow control, enabling high mass flow capacity and adaptability to different operating points, thereby optimizing engine efficiency and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the turbine dimensions are reduced to meet emission regulations and enable high exhaust gas recirculation rates, then emissions are reduced and EGR rates are increased, but mass flow capacity is limited and engine power output is restricted
Solution Approach 1:
The patent applies dynamics by making the turbine outlet cross-section adjustable through a blocking member that can be moved to different positions. This allows the turbine to dynamically adapt its mass flow capacity according to operating conditions, resolving the contradiction between reduced dimensions for emissions compliance and the need for variable mass flow capacity for engine power output.
2Adaptability or versatility
If the turbine dimensions are reduced to accommodate high exhaust gas recirculation rates, then EGR rates are increased, but engine power output is restricted
Solution Approach 1:
The adjustable blocking member enables dynamic adaptation of the turbine outlet cross-section, allowing the system to switch between high EGR rate operation (with reduced effective outlet area) and high power output operation (with increased effective outlet area), thus resolving the contradiction between adaptability for EGR and power output.
Solution Approach 2:
The patent changes the geometric parameter of the turbine outlet cross-section by moving the blocking member to different positions. This parameter change allows the turbine to optimize its performance for different operating modes (EGR vs. power output), resolving the contradiction between adaptability for EGR rates and engine power output.
3Adaptability or versatility
If the outlet cross-section is reduced to increase exhaust gas recirculation, then EGR rates are increased, but mass flow through the turbine is limited
Solution Approach 1:
The blocking member provides dynamic control of the outlet cross-section, enabling the system to adjust the balance between EGR flow and turbine mass flow based on operating requirements. This resolves the contradiction by allowing the outlet area to be dynamically reduced for EGR while maintaining the capability for high mass flow when needed.
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 design achieves high engine efficiency, low fuel consumption, and reduced emissions by allowing adjustable mass flow through the turbine, accommodating various operating conditions and meeting stringent emission standards while maintaining compact dimensions.
Implementation Method 1
a bypass duct (128), via which exhaust gas can bypass the turbine wheel (116) and whose flow cross-section is also adjustable by the blocking member (122, 124) moved the adjusting part (120)
Implementation Method 2
a turbine wheel (116), which, for driving a compressor wheel (24) of the compressor (20) and is connected to the turbine wheel (116) in a rotationally fixed manner via a shaft (not illustrated), may be acted on by exhaust gas from the internal combustion engine (10) which is guidable through the spiral channel (94, 96)
Data Source
AI summary
In a turbine for an exhaust gas turbocharger of an internal combustion engine having a housing part with accommodation space including a turbine wheel and at least one spiral channel via which exhaust gas of the internal combustion engine may flow. The spiral channel has an outlet cross-section via which the turbine wheel accommodated in the accommodation space may be acted on by the exhaust gas, and has at least one blocking member, which is connected to an adjusting part so as to be movable hereby in the peripheral direction of the accommodation space for adjusting the outlet cross-section (AR, ARλ, AR,RGR). A bypass duct is provided, via which exhaust gas can bypass the turbine wheel and whose flow cross-section is also adjustable by the blocking member moved the adjusting part.