A parking detection system and method with self-built magnetic field

Abstract

The present invention provides a parking detection system and method with a self-generated magnetic field. The system includes: a collector, a magnetic sensor, an analog signal generator, a switch, and an induction coil. The collector is connected to the magnetic sensor to collect the current magnetic field value. The analog signal generator outputs a sinusoidal signal to the induction coil. The magnetic field strength is controlled by adjusting the frequency and amplitude of the sinusoidal signal, and the direction of the generated magnetic field is adjusted by the switch. The parking detection system and method with a self-generated magnetic field provided by embodiments of the present invention can solve the problem of a magnetic sensor being unable to return to its initial state due to long-term use or interference from a strong magnetic field, ultimately causing the magnetic sensor to fail when detecting the parking state, and ultimately rendering the product unusable.

Description

Technical Field

[0001] The present invention relates to the technical field of parking detection, and more particularly to a parking detection system and method with a self-built magnetic field. Background Art

[0002] The parking detection method in the existing technology generally uses magnetic sensors for detection, and is carried out in conjunction with millimeter wave, infrared, and ultrasonic methods. Due to the low power consumption of magnetic sensors, their detection method is still the main one. As a low-power parking detection method, the detection of magnetic sensors is still the main triggering method for detection.

[0003] However, this detection method in the prior art may cause the magnetic sensor to be magnetized, and strong magnetic interference may cause the magnetic sensor data to be saturated and unusable.

[0004] Therefore, a new parking detection method with self-built magnetic field is urgently needed to solve the above problems. Summary of the Invention

[0005] The present invention provides a parking detection system and method using a self-generated magnetic field that overcomes the above-mentioned problems or at least partially solves the above-mentioned problems. According to a first aspect of the present invention, the present invention provides a parking detection system using a self-generated magnetic field, comprising:

[0006] Collector, magnetic sensor, analog signal generator, induction coil, switching switch, wherein the collector is connected to the magnetic sensor to collect the current magnetic field value, the analog signal generator outputs a sine wave signal and sends it to the induction coil through the switching switch, and the magnetic field strength is controlled by adjusting the frequency and amplitude of the sine wave signal.

[0007] Wherein, a spiral induction coil with adjustable magnetic field strength is connected below the magnetic sensor.

[0008] The induction coil is connected to the analog signal generator via a switching switch, and the direction of the sinusoidal wave signal passing through the coil is adjusted by the switching switch to adjust the direction of the magnetic field.

[0009] According to a second aspect of the present invention, the present invention further provides a parking detection method using a self-built magnetic field, comprising:

[0010] In the absence of a vehicle, the analog signal generator adjusts the frequency and amplitude of the sine wave signal and the direction of the current passing through the coil by switching the switch to calibrate the magnetic sensor to 0 intensity, while recording the sine wave frequency F and amplitude A at this time.

[0011] According to the sine wave frequency F and amplitude A, the analog signal generator and the switch are turned on at regular intervals to detect the current magnetic field strength of the magnetic sensor. If the fluctuation of the magnetic field strength is detected to exceed a preset threshold, it is determined that there is a vehicle.

[0012] The method further comprises:

[0013] If the time that the magnetic sensor is in an abnormal value exceeds a preset time, the frequency and amplitude of the sine wave signal are readjusted to calibrate the magnetic sensor to an intensity of 0.

[0014] The magnetic sensor being at an abnormal value includes:

[0015] When the magnetic field value is saturated.

[0016] The embodiments of the present invention provide a parking detection system and method with a self-built magnetic field, which can solve the problem of the magnetic sensor being unable to return to its initial state due to long-term use or interference from a strong magnetic field, ultimately causing the magnetic sensor to fail when detecting the parking state, and ultimately rendering the product unusable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a self-generated magnetic field detection system provided by an embodiment of the present invention;

[0018] Figure 2 This is a flow chart of a method for detecting a self-generated magnetic field provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0020] Figure 1 FIG. 1 is a schematic diagram of a self-generated magnetic field detection system according to an embodiment of the present invention. Figure 1 As shown, including:

[0021] Collector, magnetic sensor, analog signal generator, induction coil, switching switch, wherein the collector is connected to the magnetic sensor to collect the current magnetic field value, the analog signal generator outputs a sine wave signal and sends it to the induction coil through the switching switch, and the magnetic field strength is controlled by adjusting the frequency and amplitude of the sine wave signal.

[0022] from Figure 1 It can be seen that the embodiment of the present invention uses an analog generator to output a sinusoidal wave signal with adjustable frequency and amplitude. By adjusting the frequency and amplitude of the sinusoidal wave, the intensity of the magnetic field is controlled, which is equivalent to building a magnetic field by itself. The collector then collects the changes in the magnetic field in real time.

[0023] If the absolute value of the fluctuation exceeds the preset threshold S, it is determined that the current state is a parking state. Compared with the prior art, it can be seen that the circuit designed by the present invention is very simple, and for low-power parking detectors, the power consumption has little impact.

[0024] And the magnetic sensor can be calibrated periodically by debugging with a sine wave signal to maintain consistency.

[0025] Based on the above embodiment, a spiral induction coil with adjustable magnetic field strength is connected below the magnetic sensor.

[0026] like Figure 1 As shown, there is a spiral coil under the magnetic sensor provided by the embodiment of the present invention. Furthermore, the induction coil is connected to the analog signal generator through a switching switch, and the direction of the sinusoidal wave signal passing through the coil is adjusted by the switching switch to adjust the direction of the magnetic field.

[0027] It is understandable that the direction of the sine wave passing through the coil can be adjusted by switching the switch, which is used to adjust the direction of the magnetic field and to offset the positive or reverse magnetic field caused by different environments.

[0028] Figure 2 FIG. 1 is a flow chart of a method for detecting a self-generated magnetic field provided by an embodiment of the present invention. Figure 2 As shown, including:

[0029] 201. In the absence of a vehicle, the analog signal generator adjusts the frequency and amplitude of the sine wave signal and the direction of the current passing through the coil by switching the switch to calibrate the magnetic sensor to 0 intensity, while recording the sine wave frequency F and amplitude A at this time;

[0030] 202. According to the sine wave frequency F and amplitude A, the analog signal generator and the switching switch are turned on at regular intervals to detect the current magnetic field strength of the magnetic sensor. If the fluctuation of the magnetic field strength is detected to exceed a preset threshold, it is determined that there is a vehicle.

[0031] It should be noted that the method provided in the embodiment of the present invention is to cooperate with Figure 1 When the system shown is used, the magnetic sensor must first be calibrated in step 201. The calibration is performed without a vehicle. By adjusting the frequency and amplitude of the sine wave, the magnetic sensor is calibrated to a magnetic field strength of approximately 0.

[0032] Then in step 202, the threshold strength S for the vehicle presence state is set, and magnetic field detection is started regularly. Once the absolute value of the magnetic field fluctuation exceeds S, it is considered that the current vehicle presence state is established.

[0033] Based on the above embodiment, the method further includes:

[0034] If the time that the magnetic sensor is in an abnormal value exceeds a preset time, the frequency and amplitude of the sine wave signal are readjusted to calibrate the magnetic sensor to an intensity of 0.

[0035] Based on the above embodiment, the magnetic sensor being at an abnormal value includes:

[0036] When the magnetic field value is saturated.

[0037] Specifically, if the magnetic sensor is in an abnormal value for a long time, such as the magnetic field value is saturated, restart the sine wave calibration and adjust the magnetic field strength without a car to near 0.

[0038] In summary, the self-generated magnetic field detection method provided by the present invention can simultaneously avoid the magnetization of the magnetic sensor and the situation in which strong magnetic interference causes the magnetic sensor data to be saturated and unusable.

[0039] This embodiment also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided by the above-mentioned method embodiments, for example, including: in a state where there is no vehicle, the analog signal generator adjusts the frequency and amplitude of the sinusoidal wave signal, adjusts the direction of the current passing through the coil by switching the switch, calibrates the magnetic sensor to an intensity of 0, and records the sinusoidal wave frequency F and amplitude A at this time; according to the sinusoidal wave frequency F and amplitude A, the analog signal generator and the switching switch are turned on at regular intervals to detect the current magnetic field strength of the magnetic sensor. If the fluctuation of the detected magnetic field strength exceeds a preset threshold, it is determined that there is a vehicle.

[0040] This embodiment provides a non-transitory computer readable storage medium.

[0041] The machine-readable storage medium stores computer instructions, and the computer instructions enable the computer to execute the methods provided by the above-mentioned method embodiments, for example, including: in a vehicle-free state, the analog signal generator adjusts the frequency and amplitude of the sinusoidal wave signal, adjusts the direction of the current passing through the coil by switching the switch, calibrates the magnetic sensor to an intensity of 0, and records the sinusoidal wave frequency F and amplitude A at this time; according to the sinusoidal wave frequency F and amplitude A, the analog signal generator and the switching switch are turned on at regular intervals to detect the current magnetic field strength of the magnetic sensor; if the fluctuation of the magnetic field strength is detected to exceed a preset threshold, it is determined that there is a vehicle.

[0042] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0043] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0044] Finally, the method of this application is only a preferred embodiment and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A parking detection method using a self-built magnetic field, characterized in that: The method is implemented by a parking detection system with a self-built magnetic field, which includes a collector, a magnetic sensor, an analog signal generator, an induction coil, and a switch. The collector is connected to the magnetic sensor to collect the current magnetic field value. The analog signal generator outputs a sinusoidal signal and sends it to the induction coil via the switch. The magnetic field strength is controlled by adjusting the frequency and amplitude of the sinusoidal signal. A spiral induction coil with adjustable magnetic field strength is connected below the magnetic sensor. The induction coil is connected to the analog signal generator via the switch. The direction of the sinusoidal signal passing through the coil is adjusted by the switch to adjust the direction of the magnetic field. The method includes: In the absence of a vehicle, the analog signal generator adjusts the frequency and amplitude of the sine wave signal and the direction of the current passing through the coil by switching the switch to calibrate the magnetic sensor to 0 intensity, while recording the sine wave frequency F and amplitude A at this time. According to the sine wave frequency F and amplitude A, the analog signal generator and the switch are periodically turned on to detect the current magnetic field strength of the magnetic sensor. If the fluctuation of the magnetic field strength exceeds a preset threshold, it is determined that a vehicle is currently present. The method further includes: If the time that the magnetic sensor is in an abnormal value exceeds a preset time, the frequency and amplitude of the sine wave signal are readjusted to calibrate the magnetic sensor to an intensity of 0.

2. The parking detection method according to claim 1, characterized in that: The abnormal value of the magnetic sensor includes: When the magnetic field value is saturated.

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