North America crash regulations established regulations that require airbags mounted in 1994, and began to emphasize the need for a secondary safety device. But over time, the pressure due to the strong airbag fatalities had been occurring. So, airbag supplier and car maker had developed 30% reduction de-powered airbags compared with fullpower airbag. But, An adequacy of airbag pressure in infants on the front seat and for unbelted small women had been discussed by NHTSA. Finally NHTSA released the FMVSS208 Advanced airbag regulation for out of position small female driver, unbelted small occupant and infants on the front seat.

To satisfy the Advanced airbag regulations, car makers have applied dual-stage inflator airbag, driver seat track position sensor and occupant detection and classification sensor for passenger. Especially for static deployment fatalities about outof- positioned driver, dual stage inflator must have been applied to driver airbag.

The research and development method satisfying the FMVSS208 advanced airbag regulation with single stage inflator driver airbag will be discussed in this paper.

The various and detailed inflator performance requirement, driver airbag design method (cover tear line, cushion folding and proper initial cushion deployment shape) and layout (parts around the status of the airbag mounted on the steering wheel for the driver's seat and minimum requirement between STRG WHL and other parts) will be addressed focusing on Completed the development of the case in this paper.

This paper does not change the operating strategy applying dual stage inflator in North America and I want expect you to understand the On the other hand the improvement of performance through diverse attempts.