Electronic brake safety index for evaluating fail-safe control of brake-by-wire systems for improvement in the straight braking stability

Abstract

An electronic brake safety evaluation index is proposed as a quantitative analysis metric for evaluating the fail-safe control strategies of brake-by-wire systems for improvement in the straight braking stability. The proposed electronic brake safety evaluation index is developed with the combination of a longitudinal deceleration deviation term and a lateral deviation term of a vehicle in straight braking situations. A fuel cell electric vehicle with a brake-by-wire system model is used to simulate the effectiveness of the electronic brake safety evaluation index in various failure modes. Brake safety evaluation scenarios are proposed to find effective fail-safe control strategies for the brake-by-wire systems. The simulation results for the fail-safe control strategies of a brake-by-wire system in various failure modes show that the proposed electronic brake safety evaluation index can be a useful and effective quantitative metric for evaluating fail-safe control strategies in the development, verification and validation stages of brake-by-wire systems.