CFRP Roof Structure Mounting Concept for an Autonomous Vehicle AV POD
Publication Date: 2018-Feb-12
The IP.com Prior Art Database
CFRP Roof Structure Mounting Concept for an Autonomous Vehicle Pod
Autonomous Vehicles (AV) are equipped with additional sensing systems that will be mounted to the vehicle’s roof for signal quality and better performance. However, the additional structure (Pod) to hold the cameras, Radar, Lidar, and their electrical, cleaning, HVAC systems add more challenges to meet the roof crush requirement, where the roof crush loading plate ( see figure 1) pushes on the AV POD and might causes it to penetrate into the occupant space more than the targeted level.
Figure 1: Illustration of roof crush plate on AV roof with sensors Pod.
Design Concept and Methodology:
This work provides a design changes that protects structure performance under the loaded plate and reduces total mass with about 1.0 Kg lighter than traditional design.
As shown in figure 2, the proposed solution uses a carbon fiber reinforced polymer that utilizes a composite characteristic that is rarely favored by engineers: brittleness (or lack of ductility). Under deformation material failure occurred due to composite lack of ductility (brittle material) and subsequently POD disengaged from vehicle. Disengagement of the POD especially for the case of multiple rolls will prevent POD from penetrating into occupant space (simply POD is no longer attach to the vehicle). This concept relieves the roof from being penetrated by the AV POD, thus avoiding headliner contact with occupant head.
The material used in the POD design is Carbon Fiber CF. CF has a 2% failure and therefore is going to fracture with the fracture cracks propagating to generate the failure. Th...