Active Front Deflector Linkage for Aerodynamic and Ground Clearance Trade-off
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Solution Overview
Problem
Conventional air deflectors in vehicles are inefficient aerodynamically, lack durability, and cannot be optimally deployed without compromising vehicle capabilities, especially during off-roading or when additional ground clearance is needed.
Innovation Solution
An active front deflector assembly with a movable deflector panel using a clutched drive system and four-bar linkage arrangement, allowing for retractable deployment to improve aerodynamics and absorb impacts, while maintaining vehicle functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed air deflector is used to improve aerodynamics, then aerodynamic efficiency is improved, but the vehicle loses ground clearance capability and off-road performance
Solution Approach 1:
The air deflector is designed as a movable panel that can be dynamically positioned between a deployed state (for aerodynamic efficiency during normal driving) and a retracted state (for ground clearance during off-road conditions). This dynamic adjustment resolves the contradiction by allowing the system to optimize for different operating conditions rather than being fixed in one position
Solution Approach 2:
The system changes the positional parameter of the deflector panel between deployed and retracted states. By varying this parameter based on driving conditions, the system achieves both aerodynamic efficiency when needed and ground clearance when needed, eliminating the trade-off present in fixed designs
2Loss of energy
If a fixed air deflector is used to improve aerodynamics, then aerodynamic efficiency is improved, but the system is damaged during off-roading or impacts
Solution Approach 1:
The movable deflector panel can dynamically retract from impact zones during off-road conditions, preventing damage to the aerodynamic component. This resolves the contradiction by allowing the system to protect itself from damage while maintaining aerodynamic efficiency during normal operation
Solution Approach 2:
The system includes a clutch mechanism that allows the deflector to be disconnected from the drive system under excessive load conditions. This beforehand protection mechanism prevents damage to the motor and linkage by allowing the deflector to move freely when impacted, while maintaining normal operation during aerodynamic use
3Loss of energy
If an active deflector system is added to improve aerodynamics, then fuel economy is improved, but the device complexity increases
Solution Approach 1:
The system replaces complex continuous mechanical control with a simpler clutch-based mechanism that allows engagement and disengagement of the drive system. This reduces complexity compared to continuously controlled active systems while maintaining the ability to provide aerodynamic benefits when needed
Solution Approach 2:
The linkage arrangement serves multiple functions: it positions the deflector panel, provides impact absorption through folding motion, and integrates with the clutch mechanism for protection. This multi-functionality reduces the need for separate systems, thereby managing complexity while achieving aerodynamic goals
Data Source
AI summary
An active front deflector assembly having a deflector panel, actuator, and linkage assemblies each with a predetermined ratio of the links to each other for motion of the deflector panel. The assembly deploys and retracts based on vehicle requirements, and, when deployed, redirects the air flow in the front of the vehicle to improve the vehicle aerodynamics for either fuel economy or performance characteristics. Additionally, it allows for the deflector panel to retract so the vehicle meets ground clearances, etc. The deflector panel is also both rigid and semi-rigid to absorb impact energy. The drive shaft transmits the drive from the actuator coupled to one linkage assembly to the other linkage assembly for moving the deflector panel between the deployed/retracted positions. The actuator is clutched to prevent damage to the system.