Streamlined Guide Element for Intake Pressure Oscillation Damping
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Solution Overview
Problem
Internal combustion engines face challenges in eliminating disruptive pressure oscillations in the intake tract, leading to uneven cylinder charging and increased knocking tendencies, particularly in Otto-cycle engines, which affect efficiency and fuel consumption.
Innovation Solution
A guide element with a streamlined inlet and non-streamlined outlet design is introduced to minimize resistance and eliminate charge pressure oscillations, allowing for equal cylinder charging and reduced air-fuel quantity compression, thereby reducing knocking and improving engine efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional guide elements are used to damp pressure oscillations, then pressure oscillations are reduced, but cylinder charging becomes uneven and follow-up charging effects increase
Solution Approach 1:
The guide element is divided into two distinct sections: a first section with a first cross-sectional area and a second section with a second cross-sectional area. This segmentation allows different parts of the guide element to perform different functions - the first section dampens pressure oscillations while the second section ensures even cylinder charging and eliminates follow-up charging effects.
Solution Approach 2:
Different sections of the guide element have different cross-sectional areas tailored to their specific functions. The first section has a first cross-sectional area optimized for pressure oscillation damping, while the second section has a second cross-sectional area optimized for uniform charge distribution. This local differentiation of geometric properties resolves the contradiction between oscillation damping and charging efficiency.
2Loss of energy
If streamlined guide element design is used, then resistance to flow is minimized, but pressure oscillations may not be sufficiently damped
Solution Approach 1:
The guide element is segmented into two sections with different cross-sectional areas. The first section can be designed with characteristics that dampen pressure oscillations, while the second section maintains streamlined geometry to minimize flow resistance. This segmentation allows the element to simultaneously achieve both oscillation damping and low flow resistance.
Solution Approach 2:
The guide element exhibits local quality variations through its changing cross-sectional area. The first section has a first cross-sectional area that creates appropriate flow conditions for oscillation damping, while the second section has a second cross-sectional area that maintains streamlined flow characteristics. This localized geometric differentiation resolves the contradiction between oscillation damping and flow resistance.
3Speed
If guide element outlet is positioned to face the internal combustion engine, then flow direction is optimized, but throttling action increases
Solution Approach 1:
The guide element is divided into two sections with different cross-sectional areas that work together to optimize flow while minimizing throttling. The first section manages flow direction toward the engine, while the second section maintains adequate flow area to reduce throttling effects. This segmentation allows simultaneous optimization of flow direction and energy loss.
Solution Approach 2:
The guide element has local quality variations in its cross-sectional area that allow it to perform multiple functions. The first section provides flow direction control, while the second section maintains streamlined flow characteristics with reduced throttling. This local geometric differentiation resolves the contradiction between flow direction optimization and throttling minimization.
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 guide element effectively reduces charge exchange work, lowers cylinder charge temperatures, and enhances engine efficiency by minimizing follow-up charging effects, allowing for lower fuel consumption and reduced knocking tendencies, while also improving the operation of the exhaust-gas turbocharger.
Implementation Method 1
the guide element is of streamlined form in a flow direction proceeding from the guide element inlet to the guide element outlet. Streamlined means that the guide element has no discontinuities, and the air or air-fuel quantity flowing through the guide element, is opposed by no resistance, or by only a low resistance due to the shape of the guide element
Implementation Method 2
To eliminate disruptive oscillations, the guide element is of streamlined form... The guide element effectively reduces charge exchange work, lowers cylinder charge temperatures, and enhances engine efficiency by minimizing follow-up charging effects
Data Source
AI summary
A guide element for a pressure system of an internal combustion engine has a hollow body with a guide element inlet (27), a guide element outlet (28) and a longitudinal axis (26). The guide element (25) is designed so that flow can pass through it along its longitudinal axis (26). To eliminate disruptive oscillations, the guide element (25) is of streamlined form in a flow direction from the guide element inlet (27) to the guide element outlet (28). A pressure system for an intake tract of an internal combustion engine and an internal combustion engine with a supercharging unit also are provided.