Steering system and emergency steering control method thereof

The invention discloses a steering system and an emergency steering control method thereof, a controller in a control subsystem designs a corresponding emergency steering power-assisted compensation curve according to a vehicle speed signal and a steering wheel torque signal collected by a sensor subsystem, and a power-assisted motor provides an additional emergency steering compensation current according to a current upper limit value which can be reached so as to control the emergency steering power-assisted compensation curve. And the emergency steering function is realized by the compensated output torque of the power-assisted motor. By collecting information such as relevant vehicle speed signals, ignition signals, power-assisted motor current signals and steering wheel torque and angle, a fault diagnosis module detects whether the system starts an emergency steering mode or not, safe emergency steering of the steering system is achieved, a corresponding compensation control method is adopted in the emer