Passive Flap Airflow Regulator for Vehicle Underhood Cooling
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Solution Overview
Problem
Existing air flow regulation devices under the hood of vehicles are complex, expensive, and difficult to adapt to different vehicle types, and they fail to prevent overheating when the vehicle is stationary and the engine continues to run.
Innovation Solution
A non-motorized air flow regulation device comprising a support duct and a pivoting flap that opens onto the upper bumper beam, which automatically adjusts its position based on airflow, blocking hot air when stationary and allowing airflow when moving, using elastic or gravity-assisted mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing air flow regulation devices are used, then air flow can be regulated, but the device complexity increases and manufacturing cost rises
Solution Approach 1:
The patent employs a self-regulating flap mechanism that automatically opens or closes based on airflow pressure differences. The flap pivots on a horizontal axis and is actuated solely by aerodynamic forces from incoming air flow, eliminating the need for motors, sensors, or control systems. This self-service approach resolves the contradiction by achieving reliable air flow regulation through passive physical principles rather than complex active control systems.
Solution Approach 2:
The patent replaces motorized air flow regulation systems with a purely mechanical passive flap mechanism. Instead of using electric motors, actuators, or electronic control systems, the invention uses the natural kinetic energy of incoming air flow to pivot the flap and regulate air intake. This substitution of mechanical energy for electrical/mechanical systems reduces device complexity while maintaining regulation functionality.
2Reliability
If complex regulation devices are implemented, then air flow control improves, but production and installation costs increase
Solution Approach 1:
The patent employs a simple, inexpensive flap structure made from basic materials that can be easily manufactured and installed. The design prioritizes cost-effectiveness by using minimal components - a pivoting flap, support structure, and hinge mechanism - rather than expensive motorized systems. This approach resolves the contradiction by providing adequate temperature control functionality through a low-cost, easily manufacturable passive mechanism.
Solution Approach 2:
The self-regulating flap requires no external power source, control electronics, or complex installation infrastructure. It operates autonomously based on airflow conditions, eliminating the need for electrical wiring, control systems, or specialized installation procedures. This self-service characteristic directly reduces both production and installation costs while maintaining effective air flow regulation for temperature control.
3Temperature
If hot air is redirected under the hood when stationary, then engine heat evacuation works, but overheating of under-hood elements occurs
Solution Approach 1:
The patent implements a passive feedback mechanism where the flap position automatically responds to airflow conditions. When the vehicle is stationary or moving slowly, the reduced airflow pressure allows the flap to close, blocking hot air from entering the engine compartment and preventing overheating of electronic components. When the vehicle moves faster, increased airflow pressure opens the flap, allowing hot air to be evacuated. This automatic feedback based on airflow conditions resolves the contradiction without requiring sensors or active control.
Solution Approach 2:
The flap mechanism proactively prevents harmful hot air from entering the engine compartment under-hood area when airflow conditions indicate potential overheating risk (stationary or slow vehicle operation). By closing the flap in advance under these conditions, the system preemptively blocks the harmful thermal flow before it can cause overheating of sensitive electronic components, while still allowing heat evacuation when vehicle speed provides sufficient cooling airflow.
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 solution provides a simple, cost-effective, and adaptable air flow regulation system that prevents overheating under the hood when the vehicle is stationary, ensuring efficient temperature management without the need for motorized components.
Implementation Method 1
the flap being movable by pivoting around an axis parallel to one of its edges... the flap is movable between an open position and an obstruction position of said duct... movable by pivoting around an axis parallel to one of its edges
Implementation Method 2
the flap is provided with elastic means bringing it back from its open position to its obstructed position in the absence of air flow entering from the front of the vehicle
Implementation Method 3
using elastic or gravity-assisted mechanisms
Data Source
Figure 1~2
Figure 3
AI summary
The invention concerns a motor vehicle comprising an upper bumper beam (9), said upper bumper beam (9) comprising at least one opening (15) intended to allow an air flow originating from the front of the vehicle to flow under the bonnet (3), the vehicle further comprising at least one control device (17) for controlling the inflow of the air flow, the vehicle being characterised in that the control device or devices (17) each comprise a support (19) forming a duct oriented along the longitudinal axis of the vehicle and positioned in front of the upper bumper beam (9), opening at said or at least one of said openings (15), and a flap (23) that can move between an open position of the duct and a position in which it obstructs this duct. The invention also concerns such a control device (17).