Air Filter Air-Flow Grid for Mass Air Flow Meter Accuracy
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Solution Overview
Problem
Existing air filters in internal combustion engines do not adequately stabilize the air flow, which affects the measurement accuracy of downstream mass air flow meters, particularly in the context of modern vehicle engines where space is limited and pedestrian protection regulations must be met.
Innovation Solution
An air filter with a clean-air port supplemented by an air-flow grid that creates a uniform flow field, combined with a curved clean-air channel and flow guide ribs, to reduce turbulence and enhance measurement accuracy for mass air flow meters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional air filter is used without an air-flow grid, then the structure is simple and space-consuming components can be avoided, but the air flow is not stabilized and measurement accuracy of the mass air flow meter deteriorates
Solution Approach 1:
The air filter housing is segmented into multiple functional regions: a dirty air intake region, a filter element region, and a clean air outlet region. The air-flow grid at the clean air outlet further segments the flow into multiple streams, creating uniform flow patterns. This segmentation allows the system to achieve stable measurement conditions without requiring a completely redesign of the entire air intake system.
Solution Approach 2:
The air-flow grid acts as an intermediary component between the filter element and the mass air flow meter. It mediates the transition from turbulent filtered air to laminar flow, creating the stable flow conditions required for accurate measurement. This intermediary structure is relatively simple compared to complex flow stabilization systems.
2Volume of moving object
If the air filter is designed with standard dimensions, then manufacturing is easier, but it occupies excessive space in the cramped engine compartment
Solution Approach 1:
The air filter housing employs curved surfaces and rounded transitions instead of sharp angles and flat surfaces. The clean air channel features a curved cross-section that tapers from the filter element to the outlet. These curved geometries reduce the overall volume required for the same flow capacity while maintaining structural integrity and ease of manufacturing using standard molding techniques.
Solution Approach 2:
The invention optimizes the three-dimensional arrangement of air flow paths within the housing. The curved clean air channel creates a tapered flow path that efficiently utilizes available space. By designing the clean air outlet area to be smaller than the intake area and using vertical stacking of functional regions, the overall volume is reduced while maintaining adequate flow capacity.
3Stability of the object's composition
If the clean air channel has a straight path, then the structure is simpler, but turbulence is not reduced and measurement stability is poor
Solution Approach 1:
The clean air channel is designed with a curved cross-section that gradually tapers from the filter element toward the outlet. This curved geometry naturally guides the air flow in a smooth arc, reducing turbulence and creating more uniform flow conditions at the outlet. The curvature radius is optimized to balance flow stabilization with space constraints.
Solution Approach 2:
The cross-sectional area of the clean air channel is varied along its length, being larger near the filter element and smaller at the outlet. This parameter change creates a gradual compression of the air stream, which helps stabilize the flow and reduce turbulence. The air-flow grid parameters (mesh size, orientation) are also optimized to work with the curved channel geometry.
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 solution provides a stable and accurate measurement of air mass flow, allowing for precise determination of molar atmospheric oxygen and optimal fuel injection in internal combustion engines, while meeting space and safety requirements.
Implementation Method 1
gives the cleaned air emerging from the air filter a uniform flow field. The air flow which is homogenized in such a way can enter into the clean-air channel with reduced turbulences
Implementation Method 2
A chronologically particularly high-resolution measurement, on the other hand, can be produced according to the prior art by way of thermal anemometry by means of so-called hot film mass air flow meters
Data Source
AI summary
An exemplary air filter may include an air-permeable filter body for cleaning air, and a filter housing for holding the filter body. The air filter may also include a clean-air port fluidically connected to the filter body and mechanically connected to the filter housing for attaching the air filter to a clean-air channel. The air filter may further include a first air-flow grid arranged in the clean-air port to stabilize the filtered air.