Integrated steer and brake by wire system design according to worldwide regulations for high performance road legal cars applications

This thesis develops and validates an integrated steer-by-wire and electro-hydraulic brake-by-wire architecture for high-performance passenger vehicles, engineered to be fail-operational and compliant with worldwide regulatory expectations. Combining regulatory analysis, vehicle-dynamics simulation, and an electrical/hydraulic energy-sizing framework, the work defines redundancy, power-distribution and energy-management requirements necessary to demonstrate safe degraded operation after an energy-supply or transmission fault. A Driver-in-Motion simulator was used to generate realistic lane-change load profiles; a Simulink pump/actuator model translated hydraulic demand into electrical energy and peak-power requirements. The modelling approach was validated against an independent supplier simulation, converging within 2% under identical boundary conditions. Key findings indicate that the time-integrated draw of essential vehicle systems dominates mission energy (>90% in evaluated cases), so selective load-shedding and precise definition of “essential” functions are the most effective levers to reduce reserve sizing. Peak power capability, not stored Wh alone, emerges as the binding constraint; local buffering and partitioned power domains substantially mitigate this. The study further quantifies design margins required to assure compliance across a 130–250 ⁄ℎ envelope and highlights the necessity of conservative “worsening” factors to account for non-ideal driver and environmental conditions. Recommendations address ESD and PDU architectures, functional-safety documentation, test strategies and sensitivity analyses. The results demonstrate that, with disciplined system engineering, combined by-wire solutions can deliver the expected benefits in packaging, NVH and control while meeting global certification and product-liability expectations.