Applying STAMP/STPA to Human Safety System for Four Wheel Drive Power-train

We have been using FT or FMEA...etc to design our new products till now. In this study, we find that the new vehicle product development can be more efficient if we adopt STAMP/STPA, which shows the complicated relationship between human and machine and feedback the hazard in an early development stage. 1 Background After the Great East Japan Earthquake happening on March 3rd, 2011, our company kept pressing forward with the evaluation and the preventive measures of Safety Risk. In particular, among the automobile drive parts, there are many parts needing gas carburization and quenching, which requires flammable gas. In order not to cause explosion or fire while the accident happens, we pushed forward the risk assessment and confirmed the effectiveness of using STAMP/STPA method. And we reported our work at the 2014 STAMP Conference. [Mn14] Taking this occasion, UNIVANCE CORPORATION attempts to apply STAMP/STPA on the 4WD systematic safety planning and embed the safety management in the future products at the developing stage. Here, we are going to introduce how we build the scheme of development in this paper. UNIVANCE CORPORATION’s self-developed transfer case is equipped in the がGTR,ぎ which is the flagship 4WD vehicle of NISSAN Motors. Until now, it has also developed the 4WD systems of other vehicle manufacturers. Different from ISO26262 [ISO11], which regulates the minimum safety of the individual components and became a great issue of concern recently, we adopted the idea of STAMP/STPA, which focuses on the safety of the whole system including the complicated relationship between human and machine. We focus on the concept of “human factors” within STAMP/STPA method, in order to consider “the way of developing 4WD driving system within the vehicle automatic control function” and “the system safety of product development” at early stage of the development.