A method for controlling an onboard system in a vehicle, comprising: providing a plurality of sensors mounted in a steering wheel, wherein the sensors are a plurality of ultrasonic sensors; tracking a current gesture of a driver by using the plurality of sensors mounted in the steering wheel; determining a type of the current gesture from preset gesture types based on the tracked gesture; and controlling the onboard system to perform an operation corresponding to the type of the current gesture; wherein tracking the current gesture of the driver by using the plurality of sensors mounted in the steering wheel comprises: obtaining ultrasonic signals collected by the plurality of ultrasonic sensors within a period of time; characterized by selecting reflected signals from the collected ultrasonic signals, wherein the reflected signals are the obtained ultrasonic signals reflected from a hand or a finger of the driver within an active area of the hand or the finger of the driver; and determining the coordinates of a position of the hand or the finger of the driver in the active area within the period of time based on the selected reflected signals, to track the current gesture; wherein the inner side of the circumference of the steering wheel is provided with a plurality of sound holes, the plurality of sound holes are in one-to-one correspondence with the plurality of ultrasonic sensors, and directions of the sound holes are determined based on the active area of the hand or the finger of the driver and coverage of the ultrasonic signals. providing a plurality of sensors mounted in a steering wheel, wherein the sensors are a plurality of ultrasonic sensors; tracking a current gesture of a driver by using the plurality of sensors mounted in the steering wheel; determining a type of the current gesture from preset gesture types based on the tracked gesture; and controlling the onboard system to perform an operation corresponding to the type of the current gesture; wherein tracking the current gesture of the driver by using the plurality of sensors mounted in the steering wheel comprises: obtaining ultrasonic signals collected by the plurality of ultrasonic sensors within a period of time; characterized by selecting reflected signals from the collected ultrasonic signals, wherein the reflected signals are the obtained ultrasonic signals reflected from a hand or a finger of the driver within an active area of the hand or the finger of the driver; and determining the coordinates of a position of the hand or the finger of the driver in the active area within the period of time based on the selected reflected signals, to track the current gesture; obtaining ultrasonic signals collected by the plurality of ultrasonic sensors within a period of time; characterized by selecting reflected signals from the collected ultrasonic signals, wherein the reflected signals are the obtained ultrasonic signals reflected from a hand or a finger of the driver within an active area of the hand or the finger of the driver; and determining the coordinates of a position of the hand or the finger of the driver in the active area within the period of time based on the selected reflected signals, to track the current gesture; wherein the inner side of the circumference of the steering wheel is provided with a plurality of sound holes, the plurality of sound holes are in one-to-one correspondence with the plurality of ultrasonic sensors, and directions of the sound holes are determined based on the active area of the hand or the finger of the driver and coverage of the ultrasonic signals.