A geomagnetic vehicle detection device and its control method

Abstract

The invention discloses a geomagnetic vehicle detection device and a control method thereof, and relates to the technical field of vehicle detection. The geomagnetic vehicle detection device comprises a low-power-consumption singlechip microcomputer, a disposable lithium sub battery, and a wireless unit and a geomagnetic sensor which are connected with the low-power-consumption singlechip microcomputer, and further comprises an earthquake detector, wherein the earthquake detector is connected with the low-power-consumption singlechip microcomputer. According to the method, the earthquake detector is used for performing low-frequency detection to judge whether a vehicle exists nearby or not; magnetic data acquisition and calculation are not started until a vehicle exists nearby, and if the vehicle exists nearby according to magnetic data, wireless sending is executed. According to the geomagnetic vehicle detection device and the control method thereof, the low-power-consumption performance of the geomagnetic vehicle detection device is improved; under the condition of the same battery capacity, the service life of the geomagnetic vehicle detection device is greatly prolonged, or under the condition of the same service life, the size of the battery and even the size of the whole device are greatly reduced; therefore, the conventional wireless geomagnetic vehicle detection is further optimized.

Description

technical field [0001] The invention relates to the technical field of vehicle detection, in particular to a geomagnetic vehicle detection device and a control method thereof. Background technique [0002] The use of geomagnetic sensors is one of the important means of vehicle detection, because the chassis of almost all vehicles contain a large amount of non-ferrous metals (iron, steel, nickel, cobalt, etc.), and the magnetic field interference caused by vehicles is enough to be detected by geomagnetic sensors. The wireless geomagnetic vehicle detection technology used in the field of modern intelligent transportation has good application prospects in traffic statistics, parking space detection, overspeed detection, vehicle type judgment, traffic monitoring, railway crossing control, automatic gate opening system, etc. [0003] A wireless vehicle detection device based on a geomagnetic sensor is generally composed of a geomagnetic sensor, a low-power microcontroller, a wire...

AI Technical Summary

Problems solved by technology

However, the sensing distance of the geomagnetic sensor is relatively short, and it can only detect the magnetic field interference caused by vehicles within 2 meters. In order to perform accurate vehicle detection, the detection device needs to perform high-frequency data collection to avoid missing data

For example, the above-mentioned geomagnetic vehicle detector from SenSys needs to collect magnetic data at a frequency of 128Hz, regardless of whether there is a vehicle in the vicinity of the detector, which is actually a waste of precious battery energy

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