Modelling, testing and validation of an innovative AEB control logic on a Hardware-in-the-loop test bench

Abstract

AEB, autonomous emergency braking, is an active safety system designed to prevent vehicle frontal collision. The most diffused AEB systems are based on simple Bang Bang control logic, which could often avoid, or at least mitigate collision effects, but their effectiveness can still be improved by increasing system repeatability. The aim of this study is to model and test an innovative AEB control logic that will increase system reliability by compensating for the non-immediate response of the braking system to braking requests. Using a hardware-in-the-loop test bench with two different braking systems implemented, the new controller was tested simulating the CCRs and CCRm scenarios, used by Euro NCAP for AEB system assessment. By compensating for the delay introduced by the response of two different braking systems, the innovative control logic stops the VUT, Vehicle Under Test, at the desired safety distance from the GVT, Global Vehicle Target.

Research on Vehicle AEB Control Strategy Based on Safety Time–Safety Distance Fusion Algorithm

“…This study focuses on a vehicle AEB control strategy based on safety time-safety distance fusion algorithm; the time of reaction was considered as constant. t ′′ 1 is the time from when a braking request is issued to when the actual vehicle starts generating braking force, which is taken as 0.1 s in this study [17]; t ′ 2 is the time from the issuance of a braking request to the actual vehicle commencing the generation of braking force, which this study takes as 0.1 s [3]; t ′′ 2 is the braking force growth time, which is taken as 0.1 s in this study [10]; t 3 is the duration of the continuous braking time; and d 0 is the desired minimum stopping spacing, which is taken as 3 m in this study [18]. v 3 is the speed of the main vehicle from the initiation of braking to the point when the deceleration increases; v 4 is the speed of the main vehicle from the initiation of braking to the point where the deceleration increases.…”

“…Statistical analysis indicates that the AEB system can lead to a 22% reduction in accident mortality rates and a 27% decrease in severe pedestrian injuries, as well as a 38% reduction in the incidence of rear-end collisions. [1][2][3]. However, existing AEB systems face challenges such as insufficient working reliability in different road conditions and unsatisfactory level of accordance with the psychological expectations of drivers.…”

Open ECU EPS System, preliminary design using a Hardware-in-the-loop approach

“…An experimental test campaign was conducted, integrating the steering system in the Hardware-in-theloop test bench, provided by Meccanica 42 S.r.l. [3], [4], [5]. The tests were designed to investigate the EPS response to various driving conditions, including Open-loop and Closed-loop steering maneuvers.…”