Active Underbody Deflector for Aerodynamic Drag Reduction
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Solution Overview
Problem
Existing vehicle aerodynamic systems fail to effectively manage airflow under the vehicle, leading to increased drag and turbulence, particularly at high speeds, and require additional panels to cover cavities, which can be aesthetically unappealing and prone to damage.
Innovation Solution
An active underbody deflector system comprising a static panel and a dynamic panel, actuated by an actuator to move between stowed and deployed positions, directing airflow and reducing drag by altering the airflow path, and featuring a recoil mechanism to protect against obstacles and wind loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If additional panels are used to cover cavities on the vehicle underside, then the aerodynamic performance is improved, but the device complexity and susceptibility to damage increase
Solution Approach 1:
The patent employs a dynamic panel that can actively change its position and orientation based on vehicle operating conditions. The panel transitions between a stowed position (flush with the vehicle body) and a deployed position (extending to cover cavities and manage airflow). This dynamic adaptability allows the system to provide aerodynamic benefits only when needed, eliminating the need for permanent additional panels and reducing overall device complexity.
Solution Approach 2:
The dynamic panel serves multiple functions: it acts as an aerodynamic deflector when deployed, integrates seamlessly into the vehicle body when stowed, and can adapt to various cavity configurations. This multi-functionality replaces what would traditionally require multiple separate panels, thereby reducing device complexity while maintaining aerodynamic performance.
2Loss of energy
If additional panels are used to cover cavities on the vehicle underside, then the aerodynamic performance is improved, but the reliability and aesthetics worsen due to increased susceptibility to damage
Solution Approach 1:
The panel dynamically transitions between stowed and deployed states, being protected in the stowed position during conditions that could cause damage (off-road, low-speed maneuvers) and only extending when aerodynamic benefits are needed at higher speeds on paved surfaces. This reduces susceptibility to damage while maintaining aerodynamic performance when required.
Solution Approach 2:
The system proactively protects the panel by keeping it in the stowed position before potential damage scenarios occur (such as during off-road driving or low-speed operations), and only deploys it when conditions are favorable for aerodynamic optimization. This preliminary protective action prevents damage before it can occur.
3Adaptability or versatility
If a dynamic panel is added to the aerodynamic system, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The system uses a single dynamic panel with an actuator mechanism that provides continuous or multi-position adjustment capability. This single movable component replaces what would traditionally require multiple fixed panels in various configurations, actually reducing overall complexity while maximizing adaptability for different airflow management needs.
Solution Approach 2:
The aerodynamic management function is segmented into a fixed portion (vehicle body and cavity structures) and a single movable portion (the dynamic panel). This segmentation allows the system to achieve adaptability through one well-defined moving element rather than through multiple complex adjustable components, simplifying the overall device architecture.
4Loss of energy
If the panel is kept in a deployed position to manage airflow, then the aerodynamic performance is improved, but the ease of operation worsens due to limited ground clearance
Solution Approach 1:
The panel dynamically adjusts its position based on real-time operating conditions including ground clearance, vehicle speed, and terrain type. The control system monitors these parameters and automatically transitions the panel between stowed and deployed states, eliminating the need for manual intervention and ensuring optimal operation across varying conditions.
Solution Approach 2:
The system incorporates sensors and control logic that monitor ground clearance, vehicle speed, and other operating parameters. This feedback mechanism automatically determines the appropriate panel position, deploying the panel only when aerodynamic benefits outweigh the ground clearance constraints, and stowing it when clearance becomes limited. This closed-loop control optimizes both aerodynamic performance and operational ease.
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 active underbody deflector system reduces drag and turbulence by directing airflow away from the vehicle underside, minimizes the need for additional panels, enhances aesthetics, and protects against damage from debris and obstacles.
Implementation Method 1
directing airflow away from the vehicle underside, minimizes the need for additional panels
Data Source
AI summary
An active aerodynamic feature for an underside of a vehicle includes a static panel and a dynamic panel. The static panel has a leading edge attached to a front fascia of the vehicle, and a trailing edge distal from the front fascia. The dynamic panel is movably attached to the trailing edge of the static panel. An actuator is configured to locate the dynamic panel in at least two fixed positions relative to the static panel. The fixed positions include a stowed position, which is substantially aligned with the trailing edge of the static panel, and a deployed position, which is at an offset angle relative to the trailing edge of the static panel and also to the stowed position.