Steering wheel control method and device and steer-by-wire system

The invention provides a steering wheel control method and device and a steer-by-wire system. The method comprises the steps that a steering wheel turning angle signal, a steering wheel torque signal, a road sensing motor rotating speed signal and a current limiting angle signal are obtained; based on the steering wheel rotation angle signal and the current limiting angle signal, the limiting torque, the trigger flag bit and the target rotation speed of the steering wheel are determined; determining a rotating speed control torque of a steering wheel based on a road feeling motor rotating speed signal and the target rotating speed; determining a target motor torque according to a torque gain ratio corresponding to the steering wheel torque signal, a limiting torque and a rotating speed control torque; and under the condition that the trigger flag bit represents execution of the limiting function, a road sensing motor control instruction is generated according to the target motor torque, and the road sensing m