Flat Underside Inlet Duct Tumble Edge for Engine Charge Movement
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Solution Overview
Problem
Conventional intake systems for internal combustion engines do not efficiently manage air flow into combustion chambers, leading to suboptimal mixture preparation and combustion efficiency, resulting in higher fuel consumption and emissions.
Innovation Solution
The intake system features a flat or planar inlet duct extending to a tumble edge, with an asymmetrical cross-section and localized machining to enhance charge movement, combined with intake manifold injection to improve mixture preparation and turbulent kinetic energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional inlet duct configuration is used, then the structure is simple, but the charge movement and mixture preparation are insufficient
Solution Approach 1:
The inlet duct is designed with an asymmetrical cross-section where the bottom surface is flattened while the top surface maintains curvature. This asymmetrical geometry creates a tumble edge that generates rotational charge motion, increasing charge movement by 40-70% compared to conventional symmetrical ducts, while maintaining manufacturing feasibility through targeted machining of specific surfaces
Solution Approach 2:
The bottom surface of the inlet duct is selectively flattened in the region where the tumble edge is formed, while other regions may retain different geometries. This localized modification creates the necessary tumble flow structure without requiring complete redesign of the entire inlet duct, balancing performance improvement with manufacturing complexity
2Productivity
If the inlet duct is extensively modified to increase charge movement, then mixture preparation improves, but manufacturing complexity increases
Solution Approach 1:
The flattening of the bottom surface is applied locally only in the region necessary to form the tumble edge, rather than modifying the entire inlet duct. This localized approach achieves the required mixture preparation improvement while minimizing the scope of machining operations and associated manufacturing complexity
Solution Approach 2:
The bottom surface is flattened to the extent necessary to create an effective tumble edge geometry, which may involve removing a portion of the original curved surface. This partial modification provides sufficient charge movement enhancement without requiring complete redesign or excessive machining of the entire duct structure
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 increases charge movement by 40-70% and TKE by up to 100%, leading to improved mixture preparation, rapid combustion, and reduced fuel consumption and emissions.
Implementation Method 1
a tumble edge, by which a tumble-shaped flow of the air which flows into the combustion chamber can be brought about
Data Source
AI summary
An intake system for an internal combustion engine has at least one inlet channel through which air can flow and by which the air flowing through the inlet channel is to be conducted into at least one combustion chamber of the internal combustion engine. The inlet channel is, on the bottom side thereof, of flat form at least in one length region, wherein the flat bottom side extends as far as a tumble edge by which a tumbling flow of the air flowing into the combustion chamber can be effected.