Coupled Radiator Louver and Bypass Duct for Stable Pitching Moment
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Solution Overview
Problem
Existing cooling devices for motor vehicles, with radiator louvers and bypass ducts, cause unpredictable changes in lift force balance and driving behavior due to varying pitching moments, leading to potentially dangerous driving conditions.
Innovation Solution
A cooling device with a radiator louver and bypass duct where the louver and closing element are coupled to maintain a uniform lift force and pitching moment, regardless of their positions, ensuring controlled gas flow and stable driving behavior by simultaneously opening or closing the louver and bypass duct.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the radiator louver is opened to improve cooling efficiency, then the gas flow through the radiator increases, but the lift force balance and pitching moment change intensely, adversely affecting driving behavior
Solution Approach 1:
The bypass duct acts as an intermediary flow path that compensates for changes in lift force and pitching moment. When the radiator louver opens to improve cooling, the bypass duct allows additional gas flow that counterbalances the aerodynamic changes, preventing adverse effects on driving behavior.
Solution Approach 2:
The system changes the flow distribution parameter by providing an alternative path through the bypass duct. This allows the main radiator flow to increase for better cooling while the bypass flow adjusts to maintain stable aerodynamic characteristics, effectively decoupling the two parameters.
2Use of energy by moving object
If the radiator louver is closed to reduce fuel consumption, then the cd value decreases, but the gas flow through the radiator is insufficient for adequate cooling
Solution Approach 1:
The gas flow path is segmented into two independent channels: the main radiator passage and the bypass duct. This segmentation allows the system to optimize each path separately - the radiator louver can remain closed to reduce fuel consumption while the bypass duct provides sufficient gas flow to maintain adequate cooling through the radiator.
Solution Approach 2:
The bypass duct serves multiple functions simultaneously: it provides additional gas flow to maintain cooling when the louver is closed, and it acts as a flow regulator to balance aerodynamic forces. This multi-functionality allows the system to achieve both fuel efficiency and adequate cooling.
3Temperature
If the bypass duct is opened to maintain cooling, then the gas flow around the radiator increases, but the lift force balance becomes unstable and driving behavior is affected
Solution Approach 1:
The system employs feedback control where the bypass duct opening is adjusted based on the position of the radiator louver. When the louver opens or closes, the bypass duct responds accordingly to maintain stable lift force and pitching moment, ensuring driving behavior remains unaffected while cooling is maintained.
Solution Approach 2:
The bypass duct provides a counterbalancing gas flow that offsets the aerodynamic changes caused by louver position variations. This counteracting flow stabilizes the lift force balance and pitching moment, preventing instability in driving behavior while allowing the radiator to maintain adequate cooling.
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 stabilizes the lift force and pitching moment, preventing adverse effects on driving behavior and reducing contamination of the radiator, while maintaining efficient gas flow and cooling efficiency.
Implementation Method 1
a radiator louver (6) with one or more lamellae (7) for controlling a passage of a gas flow through the radiator
Implementation Method 2
a radiator (8) for the cooling water of the internal combustion engine
Data Source
AI summary
A cooling device in an engine bay of a motor vehicle has a radiator and a radiator louver with at least one lamella that controls the passage of a gas flow through the radiator. At least one bypass duct bypasses the radiator and can be closed off by an associated closing element which is operatively connected to the radiator louver in such a way that an opening of the radiator louver generates a closing of the closing element, and therefore of the associated bypass duct, and vice versa. The radiator louver and the at least one closing element are coupled to one another in such a way that, regardless of the position of the lamellae of the radiator louver and the position of the at least one closing element, an at least approximately uniform lift force, or an at least approximately uniform pitching moment, is imparted to the vehicle.