| 摘要 |
PURPOSE: A low power loop type vehicle sensing apparatus is provided to reduce power consumption by periodically cutting off the voltage supplied to an oscillation unit and setting a clock counting time in a steady state of an analog oscillation signal output from a resonance oscillation circuit. CONSTITUTION: A resonance oscillation circuit(10) comprises an LC resonance part(11) with a loop coil(11a) and an oscillation part(12) connected to the LC resonance unit and generates an analog oscillation signal having frequency determined according to the inductance of the loop coil. A vehicle movement determining unit(20) determines the movement of a vehicle based on the analog oscillation signal output from the resonance oscillation circuit. The vehicle movement determining unit comprises a movement determination clock generating part, a counting control part, a movement determination clock counting part, and a vehicle movement determination part. |
