Motor Vehicle Front End Air Flap Aerodynamic Control
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Solution Overview
Problem
Existing motor vehicle front end cooling-air mechanisms with downwardly opening air inlets suffer from high propulsion resistance and front axle lift due to constant airflow, which is not effectively managed by existing spoiler designs.
Innovation Solution
A pivotable air flap is integrated into the cooling-air mechanism, allowing it to close off the air inlet opening at low speeds for reduced resistance and open at high speeds to direct airflow to the heat exchanger while acting as a spoiler to minimize lift and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the air inlet opening is kept open to ensure cooling supply, then the heat exchanger receives sufficient air, but propulsion resistance and front axle lift increase
Solution Approach 1:
The air flap is designed to be movable between open and closed positions, allowing the system to dynamically adapt to different driving conditions. This resolves the contradiction by enabling the air inlet to be open when cooling is needed and closed when aerodynamic performance is prioritized
Solution Approach 2:
The system changes the opening state parameter of the air inlet based on driving conditions. By transitioning between open and closed states, the system optimizes both cooling supply and aerodynamic properties at different operating points
2Force
If a spoiler is used to reduce propulsion resistance and front axle lift, then aerodynamic properties improve, but the air inlet opening remains open causing continued resistance
Solution Approach 1:
The air flap serves multiple functions: it acts as an air inlet closure when closed and as a spoiler when open. This multi-functionality eliminates the need for separate spoiler components, reducing device complexity while maintaining aerodynamic benefits
Solution Approach 2:
The invention combines the air inlet closure function and the spoiler function into a single integrated component (the air flap). This merging eliminates the need for separate mechanisms and resolves the contradiction between aerodynamic performance and system complexity
3Device complexity
If the air flap is positioned behind the air inlet opening, then the structure is simpler, but aerodynamic effectiveness is reduced
Solution Approach 1:
The air flap is positioned upstream (in front of) the air inlet opening rather than downstream, changing the spatial arrangement to improve aerodynamic effectiveness. This positioning allows the flap to interact with the incoming airflow before it reaches the inlet, enhancing the spoiler effect and reducing resistance
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 improved aerodynamic properties by reducing air resistance and front axle lift across various speeds, ensuring efficient airflow and cooling while maintaining low resistance in both closed and open positions.
Implementation Method 1
the air flap, in its operative position, forms a spoiler by which air resistance and front axle lift are reduced in a laminar incident flow
Implementation Method 2
air resistance and front axle lift are reduced in a laminar incident flow
Data Source
AI summary
A motor vehicle front end has a heat exchanger and a cooling-air mechanism for controlling a supply of air to the heat exchanger. The cooling-air mechanism includes: a downwardly opening air inlet opening; and an air flap, which corresponds to the air inlet opening, and which, at its top edge, is articulatable on a body part in a pivotable manner via a pivot joint. The air flap is configured such that, in its closed position, it closes off the air inlet opening, and in its operative position, it opens up the air inlet opening, and as seen in a direction of travel of the motor vehicle, is situated in front of the air inlet opening.