IWG-DPPS Investigation of Test Condition in Overshoot Duration

Schematic of Bonnet Activation Overshoot Duration Need to be considered Steady (convergence) State Static Test Actuator Activating state Dynamic Test Bonnnet Lift Intended Height Lift of actuator Lift of Bonnet *It is assumed that lift of bonnet is greater than that of actuator since actuator has lock system TRT Time HIT HIT HIT Items to be considered: Difference of HIC value between dynamic and static test condition at the start timing of overshoot (worst case)

HIC Difference between Dynamic and Static Condition Car model and simulation conditions Schematic of this investigation Car model and detailed simulation condition Car model: with active bonnet (static test is available in all of headform test area) Actuator location: Below the bonnet hinge (only lifted in rear of the bonnet) Actuator lift speed: maximum considering production variation Impact Point: On center line, at the point where HIT is approximately 35ms larger than TRT (enough for static test) Impactor: Child 50 degree Bonnet Lift speed: 2.1m/s Time Bonnnet Lift Intended Height TRT Lift of actuator Lift of Bonnet Actual HIT for this condition Virtually confirmed timing Image of Impact Location HIC difference between dynamic and static condition at the start timing of overshoot was virtually confirmed

HIC Difference between Dynamic and Static Condition Results Comparison bet. Dynamic and static condition at 35km/h Dynamic Static Condition HIC Dynamic 661.4 Static 639.4 In current virtual condition, HIC difference between dynamic and static condition is approximately 3%