Vehicle-mounted human-machine interaction system

A vehicle-mounted human-machine interaction system, comprising:

• a piezoelectric sound-generating circuit disposed in a cavity between a body panel as an outer surface of a vehicle and an interior panel as an inner surface of the vehicle and attached to either the body panel or the interior panel;
• a wake-up subsystem configured to wake up an on-board controller to turn on a human-machine interaction function based on at least one of voices, movements, or images of objects outside the vehicle;
• and
• the on-board controller configured to output an audio signal to the piezoelectric sound-generating circuit after being woken by the wake-up subsystem to turn on the human-machine interaction function such that as being excited by the audio signal, the piezoelectric sound-generating circuit vibrates the body panel or the interior panel to emit a voice to an exterior of the vehicle;
• wherein the piezoelectric sound-generating circuit includes:
• a driver circuit configured to receive the audio signal from the on-board controller and convert the audio signal into an excitation voltage;
• and
• a piezoelectric ceramic speaker configured to, driven by the excitation voltage generated by the driver circuit, drive the body panel or the interior panel attached thereto to vibrate, thereby emitting the voice, the piezoelectric ceramic speaker including:
• an electrode piece configured to receive the excitation voltage;
• a piezoelectric ceramic piece configured to produce transverse or longitudinal expansion or contraction driven by the excitation voltage received through the electrode piece;
• and
• a vibration plate attached to the piezoelectric ceramic piece to generate vibration as the piezoelectric ceramic piece elongates or contracts.