The invention relates to a vehicle-mounted apparatus with functions of positioning, tracking and collision warning, and belongs to the electronic technical field of automobiles. Ear plates are arranged on the left and right side walls of upper and lower shells; limiting surfaces are arranged on the end parts of the front and back side walls; an acceleration sensor is arranged on the left side wall or the right side wall of the upper shell; a circuit board with an emission unit is arranged on the bottom wall of the lower shell; the upper and lower ear plates are connected through screws, and a
cantilever beam
type metal substrate is crimped between the upper and lower ear plates; the
metal substrate, and piezoelectric wafers which are pasted on the upper and lower sides of the
metal substrate form a piezoelectric vibrator; a
moving magnet I and a
mass block are arranged on the upper and lower sides at the free end of the
metal substrate respectively; a
moving magnet II is mounted at the lower end of the
mass block; the
moving magnet I, the
mass block and the moving
magnet II form an excitation arm; the width of the inner cavities of the upper and lower shells is less than that of the
metal substrate, and greater than that of the piezoelectric wafers; and a fixed
magnet I is mounted on the top wall of the upper shell while a fixed
magnet II is mounted on the bottom wall of the lower shell. The vehicle-mounted apparatus with the functions of positioning, tracking and collision warning has the advantages and characteristics of high environmental adaptability, wide
effective frequency band, high power generation capacity, and high reliability; and meanwhile, the vehicle-mounted apparatus can be used as an independent part to be embedded in a hidden place of the vehicle body, so that the vehicle-mounted apparatus is safe and reliable.