Active Front Hood Positioning for Aerodynamic Drag Reduction
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Solution Overview
Problem
Current vehicle front end hood designs that prioritize aesthetics result in poor aerodynamic performance, as higher, box-like fronts are visually appealing but inefficient aerodynamically, while lower fronts improve aerodynamics but compromise appearance.
Innovation Solution
An active front hood that can lower or raise portions of the hood based on vehicle speed, using actuators and a controller to switch between a raised, box-like styling for low speeds and a lowered, aerodynamic configuration at higher speeds, with integrated air guides to manage airflow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the hood is raised to a higher, box-like configuration for aesthetic purposes, then the vehicle achieves a sportier appearance, but aerodynamic performance deteriorates due to increased drag
Solution Approach 1:
The hood is designed as a dynamic component that can change its position between raised and lowered configurations based on vehicle operating conditions. The active hood system uses actuators to move the hood between different positions, allowing the vehicle to optimize between aesthetic appearance at low speeds and aerodynamic efficiency at high speeds.
Solution Approach 2:
The system changes the physical parameter of hood position based on vehicle speed. At low speeds, the hood remains in a raised position for aesthetic purposes. At high speeds, the hood lowers to reduce drag, directly changing the geometric parameter to optimize aerodynamic performance.
2Object-affected harmful factors
If the hood is lowered to improve aerodynamic performance at high speeds, then drag is reduced, but the sporty appearance is compromised
Solution Approach 1:
The hood transitions from a static design to a dynamic one, capable of adjusting its position based on real-time driving conditions. This dynamic adjustment allows the vehicle to maintain optimal aerodynamic performance at high speeds while preserving aesthetic appeal at lower speeds.
Solution Approach 2:
The system dynamically adjusts the hood position parameter in response to vehicle speed changes. When the vehicle accelerates to highway speeds, the hood lowers to optimize airflow and reduce drag, then returns to its raised position when speed decreases, continuously optimizing the shape parameter.
3Device complexity
If a fixed hood design is used, then manufacturing and structural simplicity is maintained, but the system cannot adapt to different speed conditions for optimal performance
Solution Approach 1:
The hood system incorporates dynamic elements including actuators, control systems, and movable hinge mechanisms that enable the hood to adapt to different driving conditions. This dynamic capability allows the system to optimize aerodynamic performance across various speed ranges while maintaining manageable structural complexity.
Solution Approach 2:
The active hood system serves multiple functions: aesthetic display at low speeds, aerodynamic optimization at high speeds, and potential cooling management. This multi-functionality justifies the added complexity by providing adaptability across different operating conditions that a fixed design cannot achieve.
Data Source
AI summary
A vehicle including a vehicle hood disposed over a front end compartment of the vehicle, the hood having a front end and a rear end, the rear end being proximal to a front windshield area of the vehicle; at least one hood actuator operably coupled to the hood, the at least one hood actuator being configured to move at least a portion of the hood relative to the front end compartment; and a controller in communication with the at least one hood actuator, the controller being configured to control the at least one hood actuator in response to a predetermined vehicle operating condition. The hood further includes an active hinge defining a hood pivot axis disposed between the front end and the rear end, whereby the at least one hood actuator is configured to move only a forward portion of the hood disposed between the active hinge and the front end of the hood.