Parking space state judgment method

Abstract

The invention relates to the field of intelligent traffic, in particular to a parking space state judgment method which comprises a parking space judgment control system, dynamic detection equipment and static detection equipment, the dynamic detection equipment and the static detection equipment are in circuit connection with the parking space judgment control system, and the dynamic detection equipment and the static detection equipment are arranged in each parking space. The number of the dynamic detection devices for each parking space is two or more, and the dynamic detection devices are connected in parallel. The dynamic detection device is used for detecting the dynamic state of a vehicle when the vehicle is driven into or out of a parking space, and the static detection device is used for detecting the static state of the parking space after the vehicle is stably parked or driven out. According to the invention, dynamic detection and static detection results are combined, and the current parking space and adjacent parking space information are fused for comprehensive judgment, so that the data accuracy can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of intelligent transportation technology, and in particular to a method for determining a parking space status. Background Art

[0002] As the urban areas of various countries continue to expand, the difficulty of parking in urban areas has almost become a global problem. However, the intelligence level of most existing parking spaces is very low, that is, the parking space information island is the main cause of this problem. NavigantResearch's research report points out that the waste of resources and unnecessary pollution in parking are considerable. The parking guidance system can collect and process the information of vacant parking spaces and send it to the driver, guiding the driver to find the most effective parking space in time to solve the above problems. A widely used parking guidance system must meet these conditions at the same time: accurate data collection, low construction and maintenance costs, and adaptability to various parking spaces. However, existing products and technologies cannot meet the above requirements.

[0003] Analysis of existing parking space detection technology: 1. Geomagnetic, ultrasonic, infrared and other static parking space detection sensors: detect the occupancy status of each parking space and upload it to the data center.

[0004] Advantages: Battery powered, suitable for all types of parking lots.

[0005] Disadvantages: Low data accuracy: Detection methods such as geomagnetic, ultrasonic, and infrared are easily interfered with (other objects, metal objects, etc.), and the error is relatively large; irregular parking can cause misjudgment, such as multiple parking spaces being occupied or vehicles not being detected.

[0006] Difficulty: The high cost makes it impossible to deploy these parking space detection sensors on a large scale.

[0007] 2. Camera parking space detection sensor: Analyzes parking lot images to determine the number of available parking spaces Advantages: It can detect multiple parking spaces at the same time, and the data is relatively accurate; Disadvantages: It requires external power supply and has poor adaptability; data accuracy is easily affected by weather conditions, such as rain and fog; due to the need to transmit and analyze images, it places high demands on the transmission system and server, and the corresponding system construction cost, traffic fee and subsequent system maintenance cost are all very high; Difficulty: The high cost and need for external power make it impossible to deploy these parking space detection sensors on a large scale.

[0008] From the above analysis, it can be seen that how to effectively improve the data accuracy of vacant parking spaces has become a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0009] In view of the shortcomings of the prior art, the present invention provides a parking space status judgment method based on an independently developed parking space detection system. The present invention can accurately judge the vacant or occupied status of a parking space by integrating different types of sensor data and adjacent parking space data, thereby improving parking efficiency and reducing resource waste and unnecessary pollution in parking.

[0010] To achieve the above object, the present invention provides the following technical solution: a method for determining the state of a parking space, It includes a parking space determination control system, and a dynamic detection device and a static detection device connected to the parking space determination control system circuit, wherein the dynamic detection device and the static detection device are arranged in each parking space, and each parking space has two or more dynamic detection devices connected in parallel; the dynamic detection device is used to detect the dynamic state of a vehicle when entering or exiting a parking space, and the static detection device is used to detect the static state of a parking space after a vehicle stops or exits; The parking space status determination method is as follows: The threshold of the detection signal of the dynamic detection device is preset as Y, the threshold of the time difference is preset as T, and the upper and lower thresholds of the signal disturbance of the static detection device are preset as α and β respectively. When the dynamic detection device on the parking space to be tested detects a signal within a time difference less than or equal to T and the signal is greater than or equal to the threshold Y, the following judgment is made: When the disturbance detected by the static detection device is greater than α, it is determined that the current parking space is occupied; When the disturbance detected by the static detection device is less than β, the current parking space is determined to be vacant; When the disturbance detected by the static detection device is less than or equal to α and greater than or equal to β, the parking space decision control system integrates the previous state information of the current parking space and the current state information of the adjacent parking space to make a judgment; When the dynamic detection devices on the parking space to be tested all detect signals within a time difference greater than T and greater than or equal to the threshold Y, or when only the dynamic detection devices on the left or right side detect signals, the status of the current parking space is comprehensively judged in combination with the detection information of the adjacent parking spaces.

[0011] Furthermore, the specific method of the parking space determination control system for fusing the previous state information of the current parking space and the current state information of the adjacent parking space for determination is: When the previous state of the current parking space is free, the current parking space is determined to be occupied; When the previous state of the current parking space is occupied, and the adjacent parking space or one of the adjacent parking spaces is occupied, the current parking space is determined to be free; When the previous state of the current parking space is occupied and the adjacent parking spaces are all vacant, it is necessary to detect the device state of the current parking space.

[0012] Furthermore, when the dynamic detection devices on the parking space to be tested detect signals within a time difference greater than T and greater than or equal to the threshold Y, or only the dynamic detection device on the left or right side detects a signal, if the geomagnetic disturbance detected by the static detection devices on the parking space to be tested and the adjacent parking space is less than α, the current parking space is judged to be vacant; if the geomagnetic disturbance detected by the static detection devices on the parking space to be tested and the adjacent parking space is greater than or equal to α, it is judged that both the current parking space and the adjacent parking space are occupied.

[0013] Preferably, the dynamic detection device is a piezoelectric sensor.

[0014] Preferably, the static detection device is a geomagnetic sensor.

[0015] Compared with the prior art, the parking space status determination method of the present invention has the following beneficial effects: 1. The present invention determines the parking space status by combining dynamic detection results with static detection results, which effectively improves the accuracy of parking space detection results.

[0016] 2. The present invention determines the current parking space usage status by integrating the information of adjacent parking spaces, and can accurately determine the specific location of a vehicle parked in a certain parking space, further improving the accuracy of parking space determination, and can promptly discover situations where two parking spaces are occupied, reducing resource waste in parking and greatly improving the user's parking experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural diagram of the present invention; Figure 2 This is a schematic diagram of three consecutive parking spaces and sensors according to Embodiment 1 of the present invention; Figure 3 A list of all situations in which the piezoelectric sensor is triggered asynchronously according to Embodiment 1 of the present invention; Figure 4 It is a schematic diagram of the AR and BL piezoelectric sensors being triggered by an occupied vehicle in Embodiment 1 of the present invention; Figure 5 Schematic diagram of the AL and BL piezoelectric sensors being triggered by an occupied vehicle in Example 1 of the present invention; Figure 6 It is a schematic diagram of the BL and CL piezoelectric sensors being triggered by an occupied vehicle in Example 1 of the present invention; Figure 7 This is a schematic diagram of three consecutive parking spaces and sensors according to Example 2 of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0019] See also Figure 1 A parking space status judgment method includes a parking space judgment control system, and a dynamic detection device and a static detection device connected to the parking space judgment control system circuit, wherein the dynamic detection device and the static detection device are arranged in each parking space, and each parking space has two or more dynamic detection devices connected in parallel; the dynamic detection device used in this embodiment is a piezoelectric sensor for detecting a rolling signal of a vehicle entering or exiting; the static detection device used in this embodiment is a geomagnetic sensor for detecting the static state of a parking space after a vehicle stops or exits.

[0020] This embodiment is applied to vertical / inclined parking spaces. Static detection equipment can be laid in the middle of the parking space or around the parking space. At least one static detection device or multiple static detection devices are deployed in each parking space to detect the occupancy of the parking space. Dynamic detection equipment is laid in the middle of multiple parking spaces. The dynamic detection equipment can be a set of sensor belts (two on the left and right, covering the entire parking space as one set) or multiple sets of sensor belts.

[0021] The parking space status determination method for the above parking space deployment is as follows: The threshold of the detection signal of the dynamic detection device is preset as Y, the threshold of the time difference is preset as T, and the upper and lower thresholds of the signal disturbance of the static detection device are preset as α and β respectively. When the dynamic detection device on the parking space to be tested detects a signal within a time difference less than or equal to T and the signal is greater than or equal to the threshold Y, the following judgment is made: When the disturbance detected by the static detection device is greater than α, it is determined that the current parking space is occupied; When the disturbance detected by the static detection device is less than β, the current parking space is determined to be vacant; When the disturbance detected by the static detection device is less than or equal to α and greater than or equal to β, the parking space decision control system integrates the previous state information of the current parking space and the current state information of the adjacent parking space to make a judgment; When the dynamic detection devices on the parking space to be tested all detect signals within a time difference greater than T and greater than or equal to the threshold Y, or when only the dynamic detection devices on the left or right side detect signals, the status of the current parking space is comprehensively judged in combination with the detection information of the adjacent parking spaces.

[0022] The threshold of the detection signal of the dynamic detection device is preset as Y, the threshold of the time difference is preset as T, and the upper and lower thresholds of the signal disturbance of the static detection device are preset as α and β respectively. When a group of two piezoelectric sensors on each parking space detects a signal within a time difference less than or equal to T and is greater than or equal to the threshold Y, when the geomagnetic disturbance detected by the geomagnetic sensor is greater than α, the parking space is determined to be occupied; when the geomagnetic disturbance detected by the geomagnetic sensor is less than β, the parking space is determined to be vacant. When the geomagnetic disturbance detected by the geomagnetic sensor is between α and β, the parking space determination control system needs to integrate the previous state information of the current parking space and the parking space information on the left or right side or both sides to make a determination, specifically: when the previous state of the current parking space is vacant, the parking space can be determined to be occupied; when the previous state of the current parking space is occupied, and when one of the left and right parking spaces or the left / right parking spaces is occupied, the parking space can be determined to be vacant; when the previous state of the current parking space is occupied, and when both the left and right parking spaces are vacant, the device state of the parking space needs to be detected.

[0023] When a group of two rolling sensor belts on each parking space detect signals within a time difference greater than γ, or only the left or right vehicle sensing belt detects a signal, the parking space needs to combine the sensor information of the parking spaces on its left and right sides to comprehensively determine the usage of the parking space. Specifically: when the dynamic detection device on the parking space to be tested detects a signal within a time difference greater than T and greater than or equal to the threshold Y, or only the left or right dynamic detection device detects a signal, the dynamic detection signal is triggered. If the geomagnetic disturbance detected by the static detection device on the parking space to be tested and the adjacent parking space is less than α, the current parking space is judged to be vacant; if the geomagnetic disturbance detected by the static detection device on the parking space to be tested and the adjacent parking space is greater than or equal to α, it is judged that the current parking space and the adjacent parking space are both occupied.

[0024] like Figure 2 As shown in FIG. 1 , for the convenience of explanation, this embodiment uses parking spaces A, B, and C as examples, parking space B is the center parking space, parking space A is the left parking space, and parking space C is the right parking space. A group of piezoelectric sensors in each parking space can be divided into a left L sensor and a right R sensor. Figure 3 As shown, when L and R of parking space B are triggered asynchronously, there are 15 situations, where AL represents the L piezoelectric sensor of parking space A, AR represents the R piezoelectric sensor of parking space A, and the same can be said for BL, BR, CL, and CR.

[0025] The following is for Figure 3 Each of the following situations is described separately: When the AR and BL piezoelectric sensors are triggered by occupied vehicles at the same time, if the geomagnetic disturbance detected by the geomagnetic sensor of parking space A or B is less than α, then the parking space is judged to be vacant; when the geomagnetic disturbance of A and B is greater than or equal to α, Figure 4As shown, the vehicle runs over the BL sensor and the AR sensor, and it can be determined that the right side of parking space A is occupied and the left side of parking space B is occupied.

[0026] When the AL and BL piezoelectric sensors are triggered by occupied vehicles at the same time, if the geomagnetic disturbance detected by the geomagnetic sensor of parking space A or B is less than α, then the parking space is judged to be vacant; when the geomagnetic disturbance of A and B is greater than or equal to α, Figure 5 As shown, the vehicle has run over the AL sensor and the BL sensor, so it can be determined that both the left and right sides of parking space A are occupied, and the left side of parking space B is occupied.

[0027] When the BL and CL piezoelectric sensors are triggered by occupied vehicles at the same time, if the geomagnetic disturbance detected by the geomagnetic sensor of parking space B or C is less than α, then the parking space is judged to be vacant; when the geomagnetic disturbance of B and C is greater than or equal to α, Figure 6 As shown, the vehicle has run over the BL sensor and the CL sensor, so it can be determined that both the left and right sides of parking space B are occupied, and the left side of parking space C is occupied.

[0028] By analogy, when multiple dynamic detection devices are deployed in each parking space of the system, the redundancy and reliability of system detection can be increased, and the algorithm remains basically the same. Example 2

[0029] like Figure 7 As shown, this embodiment is applied to the roadside parking space scenario.

[0030] The parking space determination algorithm of this embodiment is similar to that of Embodiment 1. When a vehicle triggers one or more parking space dynamic detection devices, it can be determined according to the vertical parking space algorithm whether the vehicle is parked in a certain parking space or occupies two parking spaces.

[0031] The present invention detects dynamic and static signals in the parking space, integrates dynamic data and static data for analysis and determines the parking space status. Compared with traditional products, the parking space status can be accurately determined without the aid of image data, which is conducive to cost saving.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A parking space status determination method, characterized in that: It includes a parking space determination control system, and a dynamic detection device and a static detection device connected to the parking space determination control system circuit, wherein the dynamic detection device and the static detection device are arranged in each parking space, and each parking space has two or more dynamic detection devices connected in parallel; the dynamic detection device is used to detect the dynamic state of a vehicle when entering or exiting a parking space, and the static detection device is used to detect the static state of a parking space after a vehicle stops or exits; The parking space status determination method is as follows: The threshold of the detection signal of the dynamic detection device is preset as Y, the threshold of the time difference is preset as T, and the upper and lower thresholds of the signal disturbance of the static detection device are preset as α and β respectively. When the dynamic detection device on the parking space to be tested detects a signal within a time difference less than or equal to T and the signal is greater than or equal to the threshold Y, the following judgment is made: When the disturbance detected by the static detection device is greater than α, it is determined that the current parking space is occupied; When the disturbance detected by the static detection device is less than β, the current parking space is determined to be vacant; When the disturbance detected by the static detection device is less than or equal to α and greater than or equal to β, the parking space decision control system integrates the previous state information of the current parking space and the current state information of the adjacent parking space to make a judgment; When the dynamic detection devices on the parking space to be tested all detect signals within a time difference greater than T and greater than or equal to the threshold Y, or when only the dynamic detection devices on the left or right side detect signals, the status of the current parking space is comprehensively judged in combination with the detection information of the adjacent parking spaces.

2. A parking space detection method as claimed in claim 1, characterized in that: The specific method of the parking space determination control system for fusing the previous state information of the current parking space and the current state information of the adjacent parking space for determination is: When the previous state of the current parking space is free, the current parking space is determined to be occupied; When the previous state of the current parking space is occupied, and the adjacent parking space or one of the adjacent parking spaces is occupied, the current parking space is determined to be free; When the previous state of the current parking space is occupied and the adjacent parking spaces are all vacant, it is necessary to detect the device state of the current parking space.

3. A parking space detection method according to claim 1, characterized in that: When the dynamic detection devices on the parking space to be tested detect signals within a time difference greater than T and greater than or equal to the threshold Y, or only the dynamic detection device on the left or right side detects a signal, if the geomagnetic disturbance detected by the static detection devices on the parking space to be tested and the adjacent parking space is less than α, the current parking space is judged to be vacant; if the geomagnetic disturbance detected by the static detection devices on the parking space to be tested and the adjacent parking space is greater than or equal to α, it is judged that both the current parking space and the adjacent parking space are occupied.

4. A parking space detection method according to claim 1, characterized in that: The dynamic detection device is a piezoelectric sensor.

5. A parking space detection method according to claim 1, characterized in that: The static detection device is a geomagnetic sensor.

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