Rear Underbody Pneumatic Aerodynamics for Variable Downforce
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Solution Overview
Problem
Existing cars face challenges in adapting their aerodynamics to different driving situations and conditions due to the fixed profile of the rear bottom, leading to inefficiencies.
Innovation Solution
Incorporation of a pneumatic unit with reversible fans or pneumatic devices in the rear bottom that can modify air flow to adjust aerodynamics based on operating parameters, controlled by an electronic control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed rear bottom profile is used, then the car structure is simple and manufacturing is easy, but the aerodynamics cannot adapt to different driving situations
Solution Approach 1:
The patent applies the dynamics principle by making the rear bottom profile variable rather than fixed. The aerodynamic element can change its profile configuration based on driving conditions (e.g., racing mode vs. normal mode), allowing the system to adapt to different operational requirements while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent implements parameter changes by modifying the geometric parameters of the rear bottom profile. The aerodynamic element can change its shape parameters (such as curvature, angle, or volume) through pneumatic adjustment or movable components, enabling adaptation to different driving situations without redesigning the entire structure.
2Productivity
If a compromise profile is used for the rear bottom, then manufacturing is simplified, but aerodynamic performance is reduced in specific driving situations
Solution Approach 1:
The patent applies segmentation by dividing the rear bottom into multiple independent aerodynamic elements or zones. Each segment can be optimized for specific driving conditions and adjusted independently, allowing high aerodynamic efficiency in particular situations while maintaining manufacturability through modular construction.
Solution Approach 2:
The patent uses dynamics to transition from a static compromise profile to a dynamic system that can optimize its aerodynamic performance in real-time. The rear bottom incorporates movable or adjustable elements that can change their configuration based on driving conditions, enabling maximum efficiency in each situation rather than relying on a fixed compromise design.
3Adaptability or versatility
If the rear bottom profile is made variable, then aerodynamic adaptability is improved, but the complexity of the aerodynamic system increases
Solution Approach 1:
The patent applies self-service by incorporating automatic control mechanisms that allow the aerodynamic system to adjust itself based on driving conditions. Sensors detect operational parameters (speed, angle, load) and automatically trigger appropriate profile changes without requiring manual intervention, reducing the operational complexity while maintaining adaptability.
Solution Approach 2:
The patent implements multi-functionality by designing the variable rear bottom system to handle multiple driving situations through a single integrated mechanism. The same aerodynamic element can serve different functions (downforce generation, drag reduction, stability) by changing its profile, eliminating the need for separate systems for each function and reducing overall complexity.
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
Enhances the car's aerodynamic performance by dynamically adjusting to different driving conditions, improving efficiency and maintaining optimal aerodynamic load.
Implementation Method 1
the blowing of the air flow F1 and/or the suction of part of the air flow F2 modify the air flow F2 and, thus, the vertical aerodynamic load and the aerodynamics of the car
Data Source
AI summary
A car has a support frame defining part of a lower floor of the car, and an aerodynamic bottom, which is at least partly fixed to the support frame, defines part of the lower floor, and has a rear bottom, which is mounted in the area of a rear zone of the car, and is provided with a pneumatic unit configured to blow a first air flow in the direction of a road surface and/or to suck part of a second air flow flowing under the lower floor during the normal operation of the car.