Many multi-axle applications use electro-hydraulic control systems with proportional valves. The proportional steeringsystem can satisfy common engineering requirements, but it is likely to fail if the steering angle or load changes drasticallybecause of poor dynamic characteristics, including dead zones, hysteresis, and frequency response. An electro-hydraulicservo steering system with servo solenoid valve is proposed to guarantee a precise dynamic response and good price–performance ratio of the closed-loop system.