Study on the optimization of hazard-control systems for advanced safety vehicle (ASV) and its safety assessment

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Advanced safety vehicles (ASVs) are supposed to materialize hazard-control systems such as distance-warning systems and emergency-brake systems. These are essentially necessitated to annihilate traffic accidents caused by automobiles. It is important to explore the fail-safe/fail-operable structures of the hazard-control systems in order to optimize the systems.The following results are obtained by the present research project :1.The feasibility of fail-safe/fail-operable structures for the hazard-control systems for ASVs is defined.2.A distance-warning system (DWS) measures the distance between a vehicle and the vehicle in front and gives warning to a driver in order to prevent rear-end collisions. It is estimated based on deductive methodology that the DWS will reduce the chance of rearend collisions by 70% and the emergency-brake system by 85%.3.An approximating risk analysis method is necessary for complex systems with computers where accurate statistics such as hardware failure rates are not always available. An A-C model function method for risk analysis, which enable us to identify hazards and to estimate accident frequencies without accurate statistics, is proposed. Analyzes of systems involving ASVs demonstrate the effectiveness of the new method.