Patent ID: 8797188

Claim:
A low power operated loop type vehicle detecting apparatus, comprising: a resonance oscillation circuit unit that includes an LC resonator having a loop coil mounted in a detecting area and an oscillator connected with the LC resonator and generates an analog oscillation signal having a frequency determined according to an inductance value of the loop coil; and a vehicle behavior determination unit that determines a vehicle behavior in a detecting area based on the analog oscillation signal output from the resonance oscillation circuit unit, wherein the vehicle behavior determination unit comprises: a behavior determination clock generator that generates a behavior determination clock having a frequency larger than the analog oscillation signal output from the resonance oscillation circuit unit; a count controller that periodically turns-on/off operating voltage supplied to the oscillator and sets clock count time in a steady-state period of the analog oscillation signal output from the resonance oscillation circuit unit; a behavior determination clock counter that counts the behavior determination clock generated in the behavior determination clock generator for the clock count time set in the count controller; and a vehicle behavioral state determiner that determines a vehicle behavioral state in a detecting area based on a count value in the behavior determination clock counter.