Adjustable Front Diffuser Flap for Vehicle Drag and Downforce
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Solution Overview
Problem
Existing front diffusers for motor vehicles do not effectively reduce the coefficient of drag and generate sufficient downforce, impacting driving stability.
Innovation Solution
A front diffuser with adjustable flaps arranged in the underbody covering, featuring a pivotable design actuated by a linear drive and toggle lever arrangement, allowing optimal positioning for minimized drag and maximized downforce, integrated within the underbody covering without additional attachments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the front diffuser uses fixed flaps, then the structure is simple, but the coefficient of drag cannot be optimized for different driving states
Solution Approach 1:
The patent applies the dynamics principle by implementing flaps that can pivot between different positions (lower horizontal position and upper oblique position) based on driving state requirements. The flaps are connected via pivot axes to the underbody covering, allowing them to change orientation dynamically. This is further enhanced by the toggle lever arrangement that enables controlled movement between end positions, transforming a static structure into a dynamic system that adapts to varying aerodynamic conditions.
2Force
If the flap is pivoted up to generate downforce, then downforce value increases, but the coefficient of drag increases
Solution Approach 1:
The patent resolves this contradiction by making the flap position dynamic rather than fixed. The flap can pivot between a lower horizontal position (minimizing drag) and an upper oblique position (maximizing downforce) based on driving state requirements. The toggle lever mechanism enables controlled transition between these end positions, allowing the system to optimize the trade-off between drag and downforce dynamically.
Solution Approach 2:
The patent applies parameter changes by modifying the flap's orientation angle as a variable parameter. By changing the flap's angular position between horizontal and oblique configurations, the system adjusts aerodynamic parameters to achieve optimal performance. The pivot axis and toggle lever arrangement enable precise control of this angular parameter to balance drag and downforce requirements.
3Reliability
If additional attachments are used to form the air duct, then the air duct structure is complete, but the device complexity increases
Solution Approach 1:
The patent applies the merging principle by integrating the air duct structure directly into the underbody covering. The air duct is formed by utilizing the existing underbody covering geometry and the flap assembly, eliminating the need for separate, additional air duct attachments. This consolidation reduces the number of discrete components while maintaining the functional integrity of the air duct system.
Solution Approach 2:
The underbody covering serves multiple functions: it provides structural support for the vehicle and simultaneously forms the air duct structure. The flap assembly also serves dual purposes by acting as both a aerodynamic control surface and a structural element of the air duct. This multi-functionality reduces the need for dedicated separate components.
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 reduces the coefficient of drag and enhances driving stability by optimizing downforce generation through adjustable flap positions, improving air pressure distribution under the vehicle.
Implementation Method 1
When the flap is pivoted up, the air duct with the delimitations thereof on both sides via the boundary walls and the pivotable flap arranged in between results in forcibly guided air conduction via the air duct into the wheel arch and therefore results in a downforce pressure.
Implementation Method 2
The downwardly pivoted front diffuser flap has an outflow surface that is level with the underbody covering and produces a favorable coefficient of drag.
Implementation Method 3
The toggle lever arrangement has an upright lever that is connected in an articulated manner to an actuating rod of the actuator in the upwardly pivoted end position of the actuating drive, and further has a downwardly oriented lever that is connected in an articulated manner to an actuating lever coupled to the flap of the front diffuser.
Data Source
AI summary
Front diffusers are provided on a front underbody covering of a vehicle, in a manner lying laterally on the inside next to the two front wheel houses. Each front diffuser has a longitudinally directed air duct integrated into the front underbody covering and has a pivotable flap. The flap is connected to an actuating device that can be actuated by a switch in the passenger compartment for shifting the device between a first position flush with the outer skin and a second upwardly pivoted position. The second, upwardly pivoted position of the front diffuser or of the flap produces an increase in downforce at the front axle.