Active Aero Diffuser Panel Extension for Drag Reduction
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Solution Overview
Problem
Traditional diffusers in motor vehicles face limitations in dynamically controlling airflow to optimize aerodynamic efficiency and downforce generation, particularly at varying vehicle speeds, leading to suboptimal drag reduction and fuel economy.
Innovation Solution
An active diffuser assembly with a retractable panel, actuated by a linear device or flaps, and supported by spring elements and bearings, which extends and retracts based on vehicle velocity to manage airflow and enhance aerodynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional fixed diffuser is used, then the vehicle structure is simple and manufacturing is easy, but the aerodynamic efficiency cannot be optimized at varying vehicle speeds
Solution Approach 1:
The patent applies the dynamics principle by implementing a movable panel within the diffuser assembly that can extend and retract based on vehicle speed. The panel is actuated by actuators (such as linear actuators or flaps) that respond to speed-sensitive inputs, allowing the diffuser geometry to dynamically adapt. This enables the vehicle to optimize aerodynamic efficiency at different speeds while maintaining a relatively simple base structure when the panel is in its default position.
2Productivity
If an active diffuser assembly with movable panel is implemented, then aerodynamic efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the diffuser's geometric parameters (panel position, angle, and extension distance) based on vehicle operating conditions. The movable panel changes its position and orientation parameters in response to vehicle speed, allowing optimization of airflow characteristics and aerodynamic efficiency, which directly impacts fuel economy.
3Object-generated harmful factors
If the panel extends past the second body end at high velocity, then drag reduction is enhanced, but the actuation mechanism complexity increases
Solution Approach 1:
The patent applies self-service by designing the actuation mechanism to automatically respond to vehicle speed without requiring complex external control systems. Speed-sensitive actuators or flaps detect the vehicle's velocity and autonomously adjust the panel position, extending it past the second body end at high velocities to maximize drag reduction while keeping the control mechanism relatively simple.
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 diffuser assembly improves aerodynamic efficiency by reducing drag and increasing downforce, enhancing fuel economy and noise reduction, while maintaining airflow control across different speed conditions.
Implementation Method 1
The diffuser uses Bernoulli's principle, according to which fluid pressure decreases as velocity of the fluid increases. Therefore, the diffuser causes the pressure below the vehicle to be lower than on the side and above the vehicle, thereby generating a measure of downforce.
Implementation Method 2
The second device may include a spring element having a first spring end secured to the panel and a second spring end secured to the second body end.
Implementation Method 3
The active panel may be supported relative to the channel via a bearing.
Data Source
AI summary
A vehicle includes a vehicle body having a first body end configured to face oncoming ambient airflow when the vehicle is in motion relative to a road surface, and also having a second body end opposite of the first body end. The vehicle also includes an underbody portion configured to span a distance between the first and second body ends and define a space between the vehicle body and the road surface. The vehicle additionally includes an active diffuser assembly disposed at the second end and configured to control the airflow past the underbody portion through the space between the vehicle body and the road surface and out to the ambient. The active diffuser assembly includes a panel configured to selectively extend into and retract from the ambient airflow aft of the second end. The active diffuser assembly also includes a first device configured to extend the panel.