Yoshiki Miichi

Collision-mitigation level of collision-avoidance braking system

In this study, a methodology for estimating the collision mitigation ratio using collision-prevention support braking system is discussed. A method for analysing the collision-mitigation ratio is discussed through a time series Monte-Carlo simulation based on the integrated error of driver and system. First, driver performance in terms of braking timing and deceleration level for collision avoidance was investigated in a driving simulator when the control timing of the braking-support system was changed. In this analysis, the braking behaviour of the driver during malfunction of the system and this behaviour when the driver was informed about the malfunction of the system were also investigated. Next, a driver model simulating braking operation, when a preceding vehicle started slowdown, was constructed. Through time series Monte-Carlo simulations using this driver model, the frequency of collisions to a preceding vehicle and the collision velocity were estimated.

Estimating damage-mitigation level of collision-prevention support braking

In this study, collision-prevention support braking was used as an example, and a methodology for estimating the collision mitigation ratio using this system is discussed. A method for analyzing the collision-mitigation ratio is discussed through a time series Monte-Carlo simulation based on the integrated error of driver and system [1][2]. First, driver performance in terms of braking timing and deceleration level for collision avoidance was analyzed in a driving simulator when the control timing of the braking-support system was changed. Next, a driver model simulating braking operation, when a preceding vehicle started slowdown was constructed. Through time series simulations using this driver model, the frequency of collisions with a preceding vehicle and the collision velocity were estimated. One result analyzed through this simulation study based on the integrated error of driver and system considering the drivers risk taking behavior during the use of the system estimates that the frequency of collisions decreased from 6.64×10−1 to 1.00×10−5 when the driver used the driving support system for collision avoidance. Although further verification regarding the driver error and system error will be necessary, a methodology for evaluating effectiveness of driving-support system is shown in this study.