The Four-Wheel Steering System Demonstrator is a working model designed to explain how steering both the front and rear wheels of a vehicle can improve maneuverability, stability, and safety. In this system, the rear wheels turn either in the opposite direction (opposite-phase) or in the same direction (same-phase) as the front wheels, depending on speed or driving conditions.

At low speeds, opposite-phase steering reduces the turning radius, making tight cornering and parking easier. At high speeds, same-phase steering increases lane-change stability and reduces body roll. This demonstrator is ideal for automotive engineering students to understand steering geometry and vehicle dynamics.

Parts Used:

1. Chassis / Frame – holds all steering components
2. Front Steering Mechanism – rack and pinion with tie rods
3. Rear Steering Assembly – steerable rear axle with tie rods
4. Steering Linkages – connect steering input to both axles
5. Servo Motor / Stepper Motor (Rear) – controls rear wheel angle
6. Microcontroller (Arduino / ESP32) – processes steering data and controls actuators
7. Steering Angle Sensor – detects position of front wheels
8. Mode Selector Switch – switches between same-phase, opposite-phase, and neutral modes
9. Power Supply / Battery – powers electronics and actuators
10. Wheels & Tires – mounted for demonstration movement