Pop-up Bonnet Actuator with Support Point Path
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Solution Overview
Problem
Modern motor vehicles lack sufficient deformation space under the bonnet to effectively protect pedestrians from head injuries in accidents, and existing bonnet-raising mechanisms require powerful and rapid actuators that can cause additional injuries if triggered after impact.
Innovation Solution
A bonnet design where the first edge is raised by an actuator, storing energy through potential and kinetic means, allowing the second edge to be raised without additional actuators, thereby reducing the risk of additional injuries and eliminating the need for additional actuators and guide means, with a support point path that prevents premature lifting of the second edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bonnet is raised by a single actuator on the first edge, then the device complexity is reduced, but the second edge may rise prematurely causing additional injury to pedestrians
Solution Approach 1:
The support point path is designed to prevent premature rising of the second edge by controlling the sequence of bonnet elevation. The actuator first raises the first edge while the support point constrains the second edge, and only after the first edge reaches sufficient height does the support point allow the second edge to rise. This preliminary constraint action prevents harmful premature movement.
Solution Approach 2:
The support point acts as an intermediary mechanism between the actuator and the second edge of the bonnet. It mediates the raising process by initially constraining the second edge to prevent premature rise, then allowing it to rise later when safe. This intermediary control resolves the contradiction between simplified actuation and pedestrian safety.
2Productivity
If powerful actuators are used to raise the bonnet rapidly, then the protection effectiveness is improved, but the risk of additional blow to pedestrian increases
Solution Approach 1:
The support point path is designed to control the sequence and timing of bonnet edge elevation. By preventing premature rise of the second edge and allowing it to rise only after the first edge reaches sufficient height, the system prepares the bonnet in a safe configuration before full elevation occurs, reducing the risk of additional blow while maintaining rapid protection response.
3Adaptability or versatility
If the entire bonnet surface is raised to protect children and adults, then the protection coverage is improved, but the energy requirement increases
Solution Approach 1:
The support point path design allows the bonnet to utilize its own structural dynamics and gravity during the raising process. After the actuator raises the first edge sufficiently, the support point naturally allows the second edge to rise, and the bonnet's own momentum and structural properties assist in completing the elevation without requiring additional actuator energy. This self-service mechanism reduces energy consumption while achieving full surface protection.
Data Source
AI summary
Described here is a motor vehicle comprising a body, a bonnet and also at least one actuator which is supported on the body and engages with a first edge of the bonnet for the purposes of raising the first edge up to a stop means in the event of an impact. Prior to the striking of the stop means, the actuator accelerates the first edge to a speed which is such that the impulse received by the bonnet is sufficient to raise a second edge of the bonnet that is located opposite the first edge when the first edge strikes the stop means.