Method and device for determining resonant frequency of ultrasonic sensor

The invention provides a method and device for determining the resonant frequency of an ultrasonic sensor. A method for intelligent driving includes: generating a driving alternating current having a driving current amplitude and a driving frequency in a driving frequency range; exciting an ultrasonic sensor using the driving alternating current to generate an ultrasonic signal; determining the impedance, corresponding to the driving frequency, of the ultrasonic sensor according to the amplitude of the ultrasonic signal and the amplitude of the driving current; determining a minimum impedance among a plurality of impedances corresponding to the driving frequency range; and determining the driving frequency corresponding to the minimum impedance as the resonant frequency of the ultrasonic sensor. 本申请提供了用于确定超声波传感器的谐振频率的方法和装置。一种用于智能驾驶的方法，包括：生成驱动交流电流，所述驱动交流电流具有驱动电流幅值和驱动频率范围中的驱动频率；使用所述驱动交流电流来激励超声波传感器以生成超声波信号；根据所述超声波信号的幅值和所述驱动电流幅值来确定所述超声波传感器的与所述驱动频率相对应的阻抗；确定与所述驱动频率范围相对应的多个阻抗中的最小阻抗；以及确定与所述最小阻抗相对应的驱动频率作为所述超声波传感器的谐振频率