Browse Publications Technical Papers 2004-01-0851
2004-03-08

Development of a Brake-Operated Pre-Crash Seatbelt System and Performance Evaluation 2004-01-0851

The brake-operated pre-crash seatbelt system retracts the seatbelt webbing by activating an electric motor attached to the seatbelt retractor. Detection of emergency braking is used as a trigger to activate the motor. Retracting the seatbelt helps to reduce an occupant's forward movement due to inertial force acting on the occupant's body during deceleration in braking. Addtionally, retraction of the seatbelt webbing also helps existing occupant restraint devices to work more effectively in a crash.
The effectiveness of the pre-crash system was evaluated by considering two conditions combined. One involved the dynamic behavior of the vehicle and occupants prior to a crash. The other concerned the safety performance of the vehicle during the crash event. Experiments were conducted to measure the behavior of the vehicle and occupants under emergency braking prior to a crash. The experimental results were then used in numerical simulations as the initial conditions for calculating parameters related to vehicle safety during a crash event. The results showed that the brake-operated pre-crash seatbelt system has the potential to reduce injury parameters even if emergency braking is applied prior to a crash.
This paper will describe how the experimental results and numerical simulations were combined to evaluate the effectiveness of the pre-crash system. The effectiveness of reducing an occupant's forward movement during emergency braking will be shown on the basis of experimental results. The effects of an occupant's forward movement on injury parameters during a crash event will be described in relation to the numerical simulation results.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Occupant Kinematics and Restraint Effectiveness during a Quarter-Turn Rollover in a Heavy Truck

2004-01-0327

View Details

TECHNICAL PAPER

Experimental Research on Truck Driver’s Safety in Frontal Collision

2001-06-0099

View Details

TECHNICAL PAPER

The Reduction of Injuries to Car Occupants in Rear End Impacts with Heavy Vehicles

933123

View Details

X