Exhaust Gas Mixer with Dynamic Flow Cross-Section Control
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Solution Overview
Problem
Existing mixer arrangements for exhaust gas systems face inefficiencies due to varying engine parameters, such as load and speed, which affect the swirling and mixing of additives, leading to inconsistent exhaust gas flow and reduced mixer performance.
Innovation Solution
Incorporating a regulating body that varies the flow cross-section within the mixer arrangement, allowing for adjustment of the exhaust gas flow ratio and minimizing variance through active or passive control, ensuring consistent mixing and swirling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the exhaust gas mass flow A1 through the mixer is allowed to vary with engine parameters, then the mixer arrangement can adapt to different operating conditions, but the mixer performance becomes inconsistent due to varying swirling efficiency
Solution Approach 1:
The patent applies the dynamics principle by making the flow cross-section Q dynamically adjustable through a regulating body (such as a damper or valve). This allows the system to adapt to varying engine operating conditions while maintaining optimal mixing performance. The regulating body modifies the flow cross-section in response to changing exhaust gas mass flow A, ensuring that the mixing process remains efficient across different engine loads and speeds.
2Device complexity
If the flow cross-section Q is kept constant, then the mixer structure can be simplified, but the mixing performance deteriorates under varying engine loads and speeds
Solution Approach 1:
The patent resolves this contradiction by introducing a dynamically adjustable flow cross-section Q through a regulating body. While this adds some structural complexity, it enables the mixer to maintain high productivity and mixing efficiency under varying engine conditions. The regulating body (damper or valve) provides a relatively simple mechanism that significantly improves mixing performance across different operating scenarios.
3Adaptability or versatility
If the exhaust gas mass flow A1 through the mixer varies with engine parameters, then the system can respond to changing operating conditions, but the variance range ΔA1 increases leading to reduced swirling efficiency
Solution Approach 1:
The patent applies dynamics by using a regulating body to dynamically adjust the flow cross-section Q, which in turn stabilizes the exhaust gas mass flow A1 through the mixer. This dynamic adjustment compensates for variations in engine parameters, reducing the variance range ΔA1 while maintaining adaptability to different operating conditions.
Solution Approach 2:
The system implements feedback control where the regulating body responds to changes in exhaust gas mass flow A and engine parameters by adjusting the flow cross-section Q. This feedback mechanism helps maintain a stable exhaust gas mass flow A1, reducing variance and improving swirling efficiency while still allowing the system to adapt to different operating conditions.
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 optimizes mixer performance by maintaining consistent injection conditions across different engine operating conditions, enhancing the homogeneity of additive mixing and reducing the variance in exhaust gas flow, thereby increasing the efficiency of the swirling process.
Implementation Method 1
a mixer for swirling the exhaust gas
Implementation Method 2
an injection device by means of which an additive can be injected
Data Source
AI summary
A mixer arrangement for an exhaust gas system, having an inlet opening through which an exhaust gas mass flow (A) can be guided, and a mixer for swirling the exhaust gas, which has at least one inflow opening that is fluidically connected to the inlet opening, wherein at least one first portion (A1) of the exhaust gas mass flow (A) can be guided through the mixer via the at least one inflow opening, an injection device by means of which an additive can be injected, and a bypass having at least one throughflow opening which is fluidically connected to the inlet opening and through which a second portion (A2) of the exhaust gas mass flow (A) can be guided past the mixer, there being provided at least one regulating body by means of which a flow cross-section Q in the mixer arrangement can be varied such that a ratio V with (formula I) can be varied.