The research of reversible pop-up Hood for pedestrian protection

Proceedings of the Institution of Mechanical Engineers, Part D:

Han

et al. 2017

This paper presents experimental results of shock mitigation of pedestrians from a frontal crash with a sports utility vehicle (SUV) by utilizing new active hood mechanisms; pop-up hood and extended hood. The pop-up hood mechanism to protect a pedestrian colliding with the hood area of a SUV is proposed and manufactured. Then, the deployment completion time of a whole active hood lift system, which significantly affects the injury sustained is measured and a headform impact test on the hood system is performed to evaluate shock mitigation of the pedestrian head impact. It is shown that using the proposed pop-up hood mechanism, the pedestrian head injury value can be reduced on the hood impact area for both children and adults. In addition, in this work the newly proposed extended hood mechanism is manufactured by considering beneficial aspects of relatively large-sized SUVs to protect pedestrians from collision with the windshield area. It is demonstrated that the proposed extended hood system can provide a much better protection effect for pedestrians compared to direct collision with the windshield only.

Section: Pop-up Hood Mechanism: Test Results and Discussionmentioning

confidence: 99%

Shock mitigation of pedestrians from sports utility vehicles impact using active pop-up and extended hood mechanisms: experimental work

Proceedings of the Institution of Mechanical Engineers, Part D:

Han

et al. 2017

“…In these tests, the pedestrian head injury value is measured by the internal three-axis acceleration sensor of the headform. The experimental head injury measurement is performed only at critical impact locations of the hood according to previous studies, 9,28 as shown in Figure 9. When the actuator operates at the hinge modules, point A presents a critical impact location for adult headform tests for a WAD of 1700-2100 mm.…”

Section: Deployment Timementioning

confidence: 99%

An experimental comparison of the pedestrian safety performances of a spring actuator and a pyrotechnic actuator for deploying an active hood lift system

Proceedings of the Institution of Mechanical Engineers, Part D:

Kang

et al. 2017

This research experimentally investigates the pedestrian safety performance of an active hood lift system of a passenger vehicle by adopting two different actuators: a spring actuator and a pyrotechnic actuator (gunpowder). After briefly introducing the working principle of the active hood lift system with the two different actuators, experiments to measure the deployment time of the system are carried out to evaluate the pedestrian safety. Subsequently, headform impact tests on the hood are performed to generate the impact force, and hence the mitigation of pedestrian injuries is investigated for the two different actuators. By comparing the measured performances obtained from both actuators, it is shown that the pyrotechnic actuator can provide a faster deployment system time. It is also identified that the spring actuator can provide a better safety performance for protecting adult pedestrians, whereas the safety performance of the pyrotechnic actuator is relatively low. Consequently, the pyrotechnic actuator is redesigned and manufactured to improve its safety performance and tested again. Then, it is shown that the modified pyrotechnic actuator can provide a better protection effect for an adult pedestrian than the spring actuator can.

“…[1][2][3][4][5] One of the advanced mechanisms to achieve this goal is to use an active hood lift mechanism (AHLM), which lifts the hood of an automobile when the vehicle collides with the pedestrian. [6][7][8][9][10] The main role of the AHLM is to absorb the shock that would normally be transmitted to the pedestrian, like an airbag system in automobiles for the drivers. In other words, this mechanism makes the available deformation space of the hood at internal room by raising the hood for protecting pedestrian from colliding with hard structures such as the engine.…”

Section: Introductionmentioning

confidence: 99%

Deploying time investigation of automotive active hood lift mechanism with different design parameters of hinge part

Advances in Mechanical Engineering

Choi

2016

This article investigates the change in deploying time of an active hood lift mechanism of a passenger vehicle activated by a gunpowder actuator. Especially, in this work, the deploying time is investigated by changing the principal design parameters of the hinge part of the hood mechanism. After briefly introducing the working principle of the active hood lift mechanism operated by the gunpowder actuator, the governing dynamic equations of the active hood lift mechanism are formulated for deploying motion. Subsequently, using the governing equations of motion, the response time for deploying the hood lift mechanism is investigated by changing several geometric locations such as the location of actuator. Then, a comparison is made of the total response time to completely deploy the hood lift mechanism with the existing conventional hood lift mechanism and the proposed active hood lift mechanism. In addition, the workable driving speed of the proposed active hood lift mechanism is compared with the conventional one by changing the powder volume of the actuator.