A Design of Fault Tolerant Logic under Network Error Using HARQ Scheme for Brake-by-Wire System

Brake-by-Wire (BBW) system replaces traditional components such as the pumps, hoses, fluids and master cylinders with electronic sensors and actuators. Because of the increasing of the electronic components in the BBW system, there will be some errors occurred in communication channels because of the noise and Electro-Magnetic Interference (EMI). Moreover, system failures will be occurred by these errors and these failures can make a safety-related malfunction of the BBW system. Once, there is a safety-related malfunction in the BBW system, the drivers´ and passengers´ lives will be directly threatened. To solve these problems in the BBW system, this paper presents a design of fault tolerant logic for the BBW system, which includes an Electro-Mechanical Brake (EMB) controlled by a fuzzy controller. In this paper, we designed a fault tolerant logic for the BBW system with hybrid automatic repeat request (HARQ) scheme using Cyclic Redundancy Check (CRC) codes and Reed-Solomon (R-S) codes. CRC codes are used to detect errors and Reed-Solomon codes are used to correct errors. This paper also presents the ability of the fault tolerant logic to the EMB system and the performance is proved.