Ground sense coil sensor and method using same to realize fast parking space detection

Abstract

The invention relates to the technical field of sensors, and discloses a ground sense coil sensor and a method using the same to realize fast detection on the vehicle existence of a parking space. The ground sense coil sensor comprises a vehicle sensing unit, a frequency detecting unit and an MCU (microprogrammed control unit) which are mutually connected; the vehicle sensing unit comprises a ground sensing coil and an LC oscillation circuit electrically connected with the ground sense coil; the frequency detecting unit comprises a PLL (phase locked loop) frequency synchronizer; the LC oscillation circuit is electrically connected with the PLL frequency synchronizer by a Schmidt trigger inverter; the ground sense coil sensor also comprises a communication module; the MCU performs power supply management on the LC oscillation circuit, the PLL frequency synchronizer and the communication module respectively. The ground sense coil sensor realizes the miniaturization of parking space detection sensors, is simple and convenient to mount without damaging a road surface and has the wireless networking function, so the construction wiring difficulty is reduced; a phase frequency detector working in an open-loop mode is used, the needed time is only dozens of milliseconds by the method for detecting the frequency change, and the work time is greatly prolonged and the power consumption is greatly reduced under the power supplying condition of a battery.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a ground sensing coil sensor applied to parking space detection, and a method for quickly detecting parking spaces using the ground sensing coil sensor. Background technique [0002] The core of the intelligent parking space management system is the parking space sensor technology. The most commonly used parking space sensors in China include ground coil sensors, geomagnetic sensors, video sensors, microwave sensors, ultrasonic sensors, infrared sensors, etc., which can meet the detection requirements of parking spaces in different environments. In static intelligent transportation applications represented by parking lots, due to the large demand for parking sensors, there are special requirements for low cost, good installability, and good maintainability. At present, the detachable ground induction coil sensor is most suitable for application in the parking lot intelligent man...

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Problems solved by technology

[0004] Furthermore, although the ground coil sensor is a relatively mature vehicle detection technology, it is found that there are still many shortcomings according to practical application experience: (1) The installation of the coil needs to cut a 2m*1.5m ring-shaped groove on the ground, and place the coil Buried in the groove for sealing, it is more difficult to install; and the noise and dust generated by cutting the ground are likely to cause environmental pollution, the construction conditions are harsh, and the construction volume will be increased at the same time

(2) The slit of the embedded coil softens the road surface and easily damages the road surface

(3) The wiring of the existing ground induction coil sensor is relatively complicated during installation, and there are disadvantages such as the inability to realize interconnection and communication with the computer

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