NHTSA has carried out a lot of New US-NCAP tests became effective from MY2011. Injury probability of New US NCAP test is more severe than previous NCAP test. The Hybrid III 5th %ile dummy in front passenger position is used instead of 50th %ile dummy. 5th %ile dummy gets lower points than 50th %ile dummy in many tests. One of the main cause is Nij. Especially neck extension moment value is main factor to improve Nij.

US NCAP frontal test data was reviewed to know tendency of neck extension moment value. The object of the study is to find out how neck moves and neck extension moment occur. Furthermore, CAE test with new concept of passenger airbag is conducted to improve extension moment based on analysis result.. New concept of passenger airbag has two main vent holes that can be closed to retain inner pressure of airbag. Retaining inner pressure of airbag can decrease relative motion between head and neck to improve Nij.