Parking space state sensor and parking space state sensing method

Abstract

The invention relates to a parking space state sensor and a parking space state sensing method. The parking space state sensor comprises an earth magnetism sensing unit, an infrared detecting unit and a control unit, wherein the earth magnetism sensing unit is used for detecting disturbance information of a parking space earth magnetic field, the infrared detecting unit comprises an infrared emitter and an infrared receiver, and the infrared emitter and the infrared receiver are respectively used for primarily judging whether a vehicle drives in onto a parking space or leaves the parking space and then further judging whether a vehicle exists in the parking space according to a detecting result of the infrared detecting unit. The parking space state sensor detects parking space states through the method of enabling the earth magnetism sensing unit with low power consumption to be in an on-duty state, together with the precise control of the control unit, only when the detecting result is not clear, is the infrared detecting unit with high power consumption and high detecting precision started to make further judgment, and therefore the parking space state sensor realizes the purposes of being low in power consumption and high in detecting precision.

Description

technical field [0001] The invention relates to a parking space state sensing technology, in particular to a wireless parking space state sensor and a parking space state sensing method. Background technique [0002] Existing parking space detectors can be divided into wired and wireless according to their communication methods. [0003] The technologies used by wired communication parking space detectors include ultrasonic detection and video detection. These detection methods need to use wired power supply and wired communication because of the high power consumption. The detection accuracy of detection products is generally higher than that of wireless parking space detection products, among which ultrasonic detection is the most widely used. However, the biggest limitation of the wired parking space detector is that its installation workload is large, which consumes manpower and materials, and requires more construction in the parking lot, such as wiring, erecting insta...

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Problems solved by technology

However, the detection principle of this method is to judge the existence of the vehicle by detecting the disturbance of the vehicle to the earth's magnetic field. Due to the diversity of manufacturing materials, heights, and chassis frame structures of different vehicles, the disturbances to the earth's magnetic field are different. The size is different. The center of the chassis of some vehicles has very little disturbance to the earth's magnetic field. The chassis of some large vehicles is so high that the ground detectors cannot detect the existence of the vehicle. Some vehicles are made of aluminum or plastic. Its ferromagnetism is very weak, resulting in very weak disturbance to the geomagnetic field, so that the detectors on the ground cannot detect the existence of vehicles. low, large error

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