PERFORMANCE ENHANCEMENT OF ELECTRO-HYDRAULIC ACTUATION SYSTEMS IN ELECTRIC AND HYBRID VEHICLES

Abstract

The rapid growth of electric vehicles (EVs) and hybrid electric vehicles (HEVs) has significantly transformed the automotive industry by emphasizing energy efficiency, sustainability, intelligent control systems, and advanced vehicle dynamics. Among various subsystems employed in modern vehicles, electro-hydraulic actuation systems (EHAS) have emerged as a critical technology enabling precise control of steering, braking, suspension, transmission, and powertrain functions. Electro-hydraulic systems combine the high force density of hydraulic actuators with the flexibility and controllability of electric drive systems, making them highly suitable for modern electrified transportation platforms. However, increasing demands for energy efficiency, dynamic response, reliability, safety, and noise reduction require continuous performance enhancement of electro-hydraulic actuation systems. This paper investigates the design, modeling, optimization, and performance enhancement of electrohydraulic actuation systems for electric and hybrid vehicles. The study focuses on system architecture, hydraulic power transmission mechanisms, electro-hydraulic servo control, energy consumption optimization, vibration suppression, fault diagnostics, and intelligent control methodologies. Mathematical models describing hydraulic flow dynamics, actuator force generation, pressure control, and system efficiency are developed to establish engineering relationships between operating parameters and performance indicators. The research further evaluates the role of advanced control techniques including adaptive control, fuzzy logic control, model predictive control, and artificial intelligence-based optimization in improving actuator performance. Detailed discussions are presented on hydraulic pump efficiency, accumulator-assisted energy recovery, regenerative braking integration, and digital hydraulic technologies. Industrial case studies demonstrate how electro-hydraulic systems contribute to enhanced vehicle safety, energy efficiency, ride comfort, and operational reliability. The findings indicate that optimized electro-hydraulic architectures can significantly reduce energy losses, improve actuator response times, minimize noise-vibration-harshness (NVH) characteristics, and increase overall system efficiency. The paper concludes that electro-hydraulic actuation will continue to play an important role in future electric and hybrid vehicle platforms, particularly when integrated with intelligent control systems, predictive maintenance technologies, and digital vehicle architectures.