Abstract: Safety critical systems are those systems whose failure could result in loss of life, significant properity damage, or damage to the environment. In cars we have common Braking System. The braking system like mechanical and hydraulic braking systems. The replacement of traditional mechanical and hydraulic control systems with electronic control devices or electronic components. The electronic braking system is known has Brake-By-Wire system. Brake-by-wire (BBW) technology in automotive industry is the ability to control brakes through electrical means. The increasing usage of brake-by-wire system in the automotive industry has provided manufacturers with the opportunity to improve both vehicle and manufacturing efficiency. In developing safety Brake-By-System for the automotive industry, potential hazard analysis techniques have to be applied to identify potential failure modes. The commonly used safety analysis techniques are FMEA (Failure Mode Effect Analysis) and FTA (Fault Tree Analysis). The basic design constraint for this application is we are considering the speed of the vehicle, frontal distance of the car and Brake pressure as an input to the application. Considering all these inputs we are calculating the Minimum Brake pressure car. The pressure value convert to electrical signal by VCU, It can transfer to Brake Control Unit(BCU). The Brake Control Unit perform to applied particular pressure to each Wheel that time the vehicle can stop. If the pressure value crosses the Within range value then the System is give a alert message. The purpose of this paper is to discuss Failure Modes and Effects Analysis (FMEA) and Fault Tree Analysis (FTA) based safety-critical approach towards to development of Brake-By-Wire system from a safety perspective. At the same time the safety critical Brake-By-Wire system is simulated in MATLAB to provide safety to the system with Transmission Controller.
Keywords: Safety critical system, safety analysis, failure analysis,, FMEA, FTA