Shielding alarm detection circuit and system for rental car

Abstract

The invention provides a shielding alarm detection circuit and system for a rental car, and the circuit comprises an acquisition circuit which is used for collecting a wireless signal; the first filtering and amplifying circuit is used for filtering and amplifying the wireless signal; the second filtering and amplifying circuit is used for filtering and amplifying the wireless signal again; the detection circuit is used for converting an alternating-current wireless signal into a direct-current voltage; the judgment module is used for judging whether the direct-current voltage exceeds a threshold value or not according to the pre-value, and if yes, an alarm signal is triggered; the alarm module is used for sending out acousto-optic electric signals; according to the invention, wireless signals are acquired through the acquisition circuit and are processed through the multi-stage filtering and amplifying circuit, so that the anti-interference capability and the stability of the signals are improved. The detection circuit converts an AC signal into a DC voltage, which is convenient for a subsequent determination module to carry out threshold comparison. The judgment module intelligently judges whether the direct-current voltage exceeds the threshold value or not according to the preset threshold value, so that the shielding behavior is accurately recognized, and the problem of false alarm is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle safety, and in particular to a shielding alarm detection circuit and system for rental vehicles. Background Art

[0002] In the field of rental vehicles, ensuring vehicle safety is of vital importance, and it is necessary to prevent the vehicle from being stolen or used illegally. Therefore, Beidou or GPS positioning systems are usually installed on vehicles to monitor the vehicle in real time. However, if the jammer blocks the 4G signal and Beidou positioning signal, the owner will not be able to effectively monitor the real-time location of the vehicle, and may face the risk of vehicle theft.

[0003] To solve this problem, a shielding alarm component needs to be installed on the vehicle. This component can alert the owner when the shield is activated and cut off the vehicle's oil circuit, making the vehicle unable to start. After the alarm is raised, the car thief usually chooses to abandon the vehicle because the vehicle cannot be moved. Figure 1 As shown, the current implementation principle on the market includes a special shielding signal detection circuit, which is composed of a radio frequency receiving chip U1. The wireless signal received by the antenna JI is coupled to the 14th pin of the receiving chip U1 through C28, and is amplified and demodulated inside U1. When the detected signal strength exceeds -60DB, the 5th pin of U1 will output a 3.3V high-level signal to the input IO port of the 4G communication module. Once the IO port detects that the low level turns to a high level, it will send a shielding alarm signal to the monitoring platform.

[0004] In practical applications, shielding false alarm problems often occur, especially in areas with dense electronic equipment, such as elevator shafts or near high-voltage towers. Since the reception level of the wireless signal is fixed (for example, -60DB), the 5th pin of U1 outputs a high level to indicate the reception of the shielding signal, so it is difficult to completely avoid false alarm problems in practical use. Summary of the invention

[0005] The present invention aims to at least solve the technical problem of shielding false alarms in the prior art, and in particular innovatively proposes a shielding alarm detection circuit and system for rental vehicles.

[0006] In order to achieve the above-mentioned object of the present invention, the present invention provides a shielding alarm detection circuit for a rental car, the circuit comprising:

[0007] A collection circuit, used for collecting wireless signals;

[0008] A first filtering and amplifying circuit, connected to the acquisition circuit, and configured to filter and amplify the wireless signal;

[0009] A second filtering and amplifying circuit, connected to the first filtering and amplifying circuit, for filtering and amplifying the wireless signal again;

[0010] A detection circuit, connected to the second filter amplifier circuit, and configured to convert the AC wireless signal into a DC voltage;

[0011] A judgment module, connected to the detection circuit, for judging whether the DC voltage exceeds a threshold value according to a preset value, and if so, triggering an alarm signal;

[0012] An alarm module, connected to the judgment module, for receiving the alarm signal and sending out an acoustic, optical and electrical signal;

[0013] The power supply circuit is used to provide stable electric energy to the detection circuit.

[0014] As an optional embodiment of the present invention, optionally, the first filtering and amplifying circuit includes a filter U1, an amplifier U2, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, an inductor L1 and an inductor L2;

[0015] One end of the capacitor C1 is connected to the output end of the acquisition circuit, the other end of the capacitor C1 is connected to pin 1 of the filter U1, pins 2, 3 and 4 of the filter U1 are all grounded, pin 5 of the filter U1 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to pin 3 of the amplifier U2, pins 1 and 2 of the amplifier U2 are both grounded, pins 4 and 5 of the amplifier U2 are connected to one end of the capacitor C3 and one end of the inductor L2, the other end of the capacitor C3 is grounded, the other end of the inductor L2 is connected to the output end of the power supply circuit and one end of the capacitor C4, and the other end of the capacitor C4 is grounded.

[0016] As an optional embodiment of the present invention, optionally, the second filtering and amplifying circuit includes a filter U3, an amplifier U4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, an inductor L3 and an inductor L4;

[0017] One end of the capacitor C5 is connected to the output end of the first filtering amplifier circuit, the other end of the capacitor C5 is connected to pin 1 of the filter U3, pins 2, 3 and 4 of the filter U3 are all grounded, pin 5 of the filter U3 is connected to one end of the capacitor C6, the other end of the capacitor C6 is connected to one end of the inductor L3, the other end of the inductor L3 is connected to pin 3 of the amplifier U4, pins 1 and 2 of the amplifier U4 are grounded, pins 4 and 5 of the amplifier U4 are connected to one end of the capacitor C7 and one end of the inductor L4, the other end of the capacitor C7 is grounded, the other end of the inductor L4 is connected to the output end of the power supply circuit and one end of the capacitor C8, and the other end of the capacitor C8 is grounded.

[0018] As an optional embodiment of the present invention, optionally, the detection circuit includes capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor C13, capacitor C14, capacitor C15, capacitor C16, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, diode ESD1 and detector U5;

[0019] One end of the capacitor C9 is connected to the output end of the second filter amplifier circuit, the other end of the capacitor C9 is connected to one end of the resistor R1 and pin 1 of the detector U5, the other end of the resistor R1 is grounded, pin 2 of the detector U5 is connected to the output end of the power supply circuit, pin 3 of the detector U5 is connected to one end of the resistor R2 and one end of the resistor R3, the other end of the resistor R2 is grounded, the other end of the resistor R3 is connected to one end of the capacitor C12, one end of the resistor R4 and pin 6 of the detector U5, the other end of the capacitor C12 is connected to pin 4 of the detector U5, and the detector Pin No. 5 of U5 is grounded, the other end of the resistor R4 is connected to one end of the resistor R5, one end of the capacitor C13, one end of the capacitor C14, one end of the capacitor C15, one end of the capacitor C16 and the negative electrode of the diode ESD1, the other end of the resistor R5, the other end of the capacitor C13, the other end of the capacitor C14, the other end of the capacitor C15, the other end of the capacitor C16 and the positive electrode of the diode ESD1 are all grounded, pin No. 8 of the detector U5 is connected to one end of the capacitor C10, one end of the capacitor C11 and the output end of the power supply circuit, and the other end of the capacitor C10 and the other end of the capacitor C11 are both grounded.

[0020] As an optional embodiment of the present invention, optionally, the power supply circuit includes a capacitor C17, a capacitor C18 and a power supply chip U6;

[0021] One end of the capacitor C17 is connected to the power supply, pin 1 of the power chip U6 and pin 3 of the power chip U6, pin 2 of the power chip U6 is grounded, pin 5 of the power chip U6 is connected to one end of the capacitor C18, and the other end of the capacitor C18 is grounded.

[0022] On the other hand, the present invention also provides a shielding alarm detection system for a rental car, the system being used for a shielding alarm detection circuit of a rental car;

[0023] The system further comprises:

[0024] A communication module, connected to the judgment module, for sending alarm information to a remote server when the judgment module triggers an alarm signal;

[0025] A positioning module, connected to the judgment module, for obtaining vehicle location information when the judgment module triggers an alarm signal, and sending the location information to a user terminal;

[0026] The control module is connected to the judgment module and is used to control the vehicle to enter a safety mode when the judgment module triggers an alarm signal.

[0027] As another optional embodiment of the present invention, optionally, the remote server is provided with:

[0028] A data analysis module, connected to the communication module, for receiving and storing the alarm information sent by the communication module, performing data analysis on the alarm information, generating an alarm report, and identifying potential shielding behavior patterns according to the frequency characteristics and / or type characteristics of the alarm information, and sending the identified shielding behavior patterns to the user terminal;

[0029] The alarm management module is connected to the data analysis module and is used to trigger a corresponding alarm response mechanism according to the alarm report generated by the data analysis module.

[0030] As another optional embodiment of the present invention, optionally, the data analysis module includes:

[0031] A data preprocessing unit, used for preprocessing the alarm information;

[0032] A feature extraction unit connected to the data preprocessing unit, used to extract key features from the preprocessed data, wherein the key features include alarm time, location, signal strength and duration;

[0033] A pattern recognition unit is connected to the feature extraction unit and is used to recognize the shielding behavior pattern using the key feature.

[0034] As another optional embodiment of the present invention, optionally, the expression for the pattern recognition unit to recognize the shielding behavior pattern using the key feature is:

[0035]

[0036] Where P(M|F) represents the probability of the occurrence of pattern M under the condition of a given feature set F, F represents the feature set consisting of alarm time, location, signal strength and duration, M represents the potential shielding behavior pattern, e represents the base of the natural logarithm, λ represents the rate parameter of the Poisson distribution, which is used to describe the average number of alarm events per unit time, T represents the total operation time of the detection circuit, k represents the number of alarm events that occur within the total operation time T of the detection circuit, and k! represents the factorial of k. represents the standard deviation of the signal strength of the ith alarm event, S i represents the signal strength of the ith alarm event, μ S represents the mean value of signal strength, represents the standard deviation of the location of the ith alarm event, L i represents the location of the ith alarm event, μ L represents the mean of the location, β represents the parameter related to the duration distribution, which is used to describe the shape characteristics of the duration, D i Represents the duration of the i-th alarm event.

[0037] As another optional embodiment of the present invention, optionally, the alarm management module includes:

[0038] An alarm classification unit, used for classifying and managing alarms according to the severity and / or urgency of the shielding behavior pattern;

[0039] A notification strategy unit, connected to the alarm classification unit, for formulating different notification strategies according to the alarm level;

[0040] an emergency response unit connected to the alarm classification unit, for automatically triggering an emergency plan upon receiving a high-level alarm, the emergency plan including automatic telephone notification of vehicle management personnel and initiation of vehicle tracking;

[0041] The feedback processing unit is used to collect feedback information from managers on the post-alarm processing results, evaluate the accuracy of the system, and optimize the system based on the evaluation results and feedback information.

[0042] Beneficial effects of the present invention: The present invention first collects wireless signals through an acquisition circuit, and processes them through a multi-stage filtering and amplification circuit, thereby improving the anti-interference ability and stability of the signal. The detection circuit converts the AC signal into a DC voltage, which is convenient for the subsequent judgment module to compare the threshold. The judgment module intelligently judges whether the DC voltage exceeds the threshold based on the preset threshold, thereby accurately identifying the shielding behavior and avoiding the problem of false alarms. Once the alarm signal is triggered, the alarm module immediately sends an alarm signal to the remote server to attract the attention of the management personnel.

[0043] In addition, the present invention also provides a communication module, a positioning module and a control module, which realizes the remote transmission of alarm information, the real-time acquisition of the vehicle position and the automatic control of the vehicle safety mode. The coordinated work of these modules not only improves the safety protection capability of the vehicle, but also facilitates the management personnel to respond to and deal with potential safety risks in a timely manner.

[0044] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0046] Figure 1 It is a circuit diagram of an existing shielding alarm detection circuit in the background technology of the present invention.

[0047] Figure 2 This is a circuit diagram of a shielding alarm detection circuit for a rental car according to Embodiment 1 of the present invention.

[0048] Figure 3 It is a structural diagram of a shielding alarm detection circuit for a rental car according to Embodiment 1 of the present invention.

[0049] Figure 4 It is a structural diagram of a shielding alarm detection system for rental vehicles according to embodiment 2 of the present invention. DETAILED DESCRIPTION

[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0051] Example 1

[0052] like Figure 2 As shown, a shielding alarm detection circuit for a rental car, the circuit comprising:

[0053] A collection circuit, used for collecting wireless signals;

[0054] It should be noted that in this embodiment, the acquisition circuit is a high-performance radio frequency receiving module, which has a built-in low-noise amplifier and a high-sensitivity radio frequency receiver, and can efficiently receive a variety of wireless signals including GPS signals and Beidou positioning signals. The design of the acquisition circuit fully considers the stability and anti-interference of the signal, and ensures that the collected signal has a high signal-to-noise ratio and accuracy by optimizing the circuit layout and selecting high-quality components. The output end of the acquisition circuit is connected to the subsequent first filter amplifier circuit, providing a reliable signal source for subsequent signal processing.

[0055] A first filtering and amplifying circuit, connected to the acquisition circuit, and configured to filter and amplify the wireless signal;

[0056] like Figure 2 As shown, the first filtering and amplifying circuit performs preliminary processing on the wireless signal sent by the acquisition circuit. The circuit is mainly composed of a filter U1 and an amplifier U2. Through the coordinated use of capacitors C1, C2, C3, C4 and inductors L1, L2 and other components, effective filtering and amplification of the wireless signal are achieved. The filter U1 is responsible for filtering out clutter and interference components in the signal, while the amplifier U2 amplifies the filtered signal to improve the strength and stability of the signal. The quality and reliability of the signal after such processing have been significantly improved, providing a strong guarantee for subsequent signal detection.

[0057] A second filtering and amplifying circuit, connected to the first filtering and amplifying circuit, for filtering and amplifying the wireless signal again;

[0058] like Figure 2 As shown, the second filter amplifier circuit further filters and amplifies the signal processed by the first filter amplifier circuit. The circuit is mainly composed of a filter U3 and an amplifier U4. Through the synergistic effect of capacitors C5, C6, C7, C8 and inductors L3, L4 and other components, deep filtering and efficient amplification of the signal are achieved. The filter U3 can further filter out the residual interference components in the signal, while the amplifier U4 amplifies the signal twice to ensure that the strength and stability of the signal meet the subsequent detection requirements. This design makes the entire signal processing process more sophisticated and reliable, and improves the overall performance of the shielding alarm detection circuit.

[0059] A detection circuit, connected to the second filter amplifier circuit, and configured to convert the AC wireless signal into a DC voltage;

[0060] like Figure 2As shown, the detection circuit converts the AC wireless signal processed by the second filter amplifier circuit into a DC voltage. The circuit is mainly composed of capacitors C9, C10, C11, C12, C13, C14, C15, C16, resistors R1, R2, R3, R4, R5, diode ESD1 and detector U5. Through the coordinated use of these components, the detection circuit can accurately convert the AC signal into a DC voltage, providing a stable voltage signal for the subsequent judgment module. This conversion process ensures the stability and reliability of the signal, and provides a solid foundation for the subsequent threshold comparison and shielding behavior identification.

[0061] A judgment module, connected to the detection circuit, for judging whether the DC voltage exceeds a threshold value according to a preset value, and if so, triggering an alarm signal;

[0062] like Figure 3 As shown, in this embodiment, the judgment module is mainly composed of a comparator, and the negative input terminal of the comparator is connected to the output terminal of the detection circuit for receiving the converted DC voltage. The positive input terminal of the comparator is connected to a preset threshold voltage source, and the threshold voltage is accurately set according to the actual application scenario and signal characteristics. When the DC voltage output by the detection circuit exceeds the threshold voltage, the comparator outputs a high level signal, triggering the alarm module to respond.

[0063] An alarm module, connected to the judgment module, for receiving the alarm signal and sending out an acoustic, optical and electrical signal;

[0064] like Figure 3 As shown in the figure, the alarm module is mainly composed of an audible and visual alarm, which is connected to the output end of the comparator in the judgment module. Once the comparator outputs a high-level signal, that is, the alarm signal is triggered, the audible and visual alarm is immediately activated, emitting a loud sound and an obvious light signal to attract the attention of the management personnel. Such a design ensures the timely transmission and effective response of the alarm signal, and improves the practicality and reliability of the entire shielding alarm detection circuit.

[0065] The power supply circuit is used to provide stable electric energy to the detection circuit.

[0066] like Figure 2 and 3As shown, in summary, the detection circuit of this embodiment first receives a wireless signal through a high-performance radio frequency receiving module (acquisition circuit), and the signal includes but is not limited to a GPS signal and a Beidou positioning signal. Through the continuous processing of the first filter amplifier circuit and the second filter amplifier circuit, the interference components in the signal are effectively filtered out, and the strength and stability of the signal are significantly improved. Then, the detection circuit converts the AC signal into a DC voltage. This conversion process ensures the stability and reliability of the signal and provides a solid foundation for the subsequent judgment module. The judgment module compares the DC voltage with a preset threshold. Once the DC voltage exceeds the threshold, the judgment module immediately triggers an alarm signal. At this time, the alarm module responds quickly and sends an acoustic and optical signal to attract the attention of the management personnel. The entire detection circuit is provided with stable electrical energy by the power supply circuit to ensure the normal operation of each module. Such a design not only improves the accuracy of shielding alarm detection, but also enhances the anti-interference ability and stability of the entire circuit.

[0067] As an optional embodiment of the present invention, optionally, the first filtering and amplifying circuit includes a filter U1, an amplifier U2, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, an inductor L1 and an inductor L2;

[0068] One end of the capacitor C1 is connected to the output end of the acquisition circuit, the other end of the capacitor C1 is connected to pin 1 of the filter U1, pins 2, 3 and 4 of the filter U1 are all grounded, pin 5 of the filter U1 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to pin 3 of the amplifier U2, pins 1 and 2 of the amplifier U2 are both grounded, pins 4 and 5 of the amplifier U2 are connected to one end of the capacitor C3 and one end of the inductor L2, the other end of the capacitor C3 is grounded, the other end of the inductor L2 is connected to the output end of the power supply circuit and one end of the capacitor C4, and the other end of the capacitor C4 is grounded.

[0069] like Figure 2 As shown in the figure, the first filter amplifier circuit mainly consists of filter U1 and amplifier U2 as core components, supplemented by auxiliary components such as capacitors C1 to C4 and inductors L1 and L2, which together form an efficient and stable signal processing channel. Filter U1 accurately filters out useless signals and interference to ensure the purity of useful signals; amplifier U2 amplifies the filtered signal to enhance the signal strength and provide a high-quality signal source for subsequent processing. The careful layout and parameter design of capacitors C1 to C4 and inductors L1 and L2 not only optimize the filtering and amplification effects of the signal, but also improve the anti-interference ability and stability of the entire circuit.

[0070] As an optional embodiment of the present invention, optionally, the second filtering and amplifying circuit includes a filter U3, an amplifier U4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, an inductor L3 and an inductor L4;

[0071] One end of the capacitor C5 is connected to the output end of the first filtering amplifier circuit, the other end of the capacitor C5 is connected to pin 1 of the filter U3, pins 2, 3 and 4 of the filter U3 are all grounded, pin 5 of the filter U3 is connected to one end of the capacitor C6, the other end of the capacitor C6 is connected to one end of the inductor L3, the other end of the inductor L3 is connected to pin 3 of the amplifier U4, pins 1 and 2 of the amplifier U4 are grounded, pins 4 and 5 of the amplifier U4 are connected to one end of the capacitor C7 and one end of the inductor L4, the other end of the capacitor C7 is grounded, the other end of the inductor L4 is connected to the output end of the power supply circuit and one end of the capacitor C8, and the other end of the capacitor C8 is grounded.

[0072] like Figure 2 As shown, the second filter amplifier circuit is similar to the first filter amplifier circuit in structure and function. The filter U3 filters out the remaining useless signals and interference again to ensure the purity of the signal; the amplifier U4 performs secondary amplification on the filtered signal to further enhance the strength of the signal. The careful design and layout of capacitors C5 to C8 and inductors L3 and L4 not only optimize the filtering and amplification effects of the signal, but also improve the reliability and stability of the entire circuit. Such a design enables the second filter amplifier circuit to output high-quality, high-intensity signals, providing a solid foundation for subsequent signal detection. Through the continuous processing of the first filter amplifier circuit and the second filter amplifier circuit, the interference components in the wireless signal are effectively filtered out, and the strength and stability of the signal are significantly improved, providing a strong guarantee for subsequent signal detection.

[0073] As an optional embodiment of the present invention, optionally, the detection circuit includes capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor C13, capacitor C14, capacitor C15, capacitor C16, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, diode ESD1 and detector U5;

[0074] One end of the capacitor C9 is connected to the output end of the second filter amplifier circuit, the other end of the capacitor C9 is connected to one end of the resistor R1 and pin 1 of the detector U5, the other end of the resistor R1 is grounded, pin 2 of the detector U5 is connected to the output end of the power supply circuit, pin 3 of the detector U5 is connected to one end of the resistor R2 and one end of the resistor R3, the other end of the resistor R2 is grounded, the other end of the resistor R3 is connected to one end of the capacitor C12, one end of the resistor R4 and pin 6 of the detector U5, the other end of the capacitor C12 is connected to pin 4 of the detector U5, and the detector Pin No. 5 of U5 is grounded, the other end of the resistor R4 is connected to one end of the resistor R5, one end of the capacitor C13, one end of the capacitor C14, one end of the capacitor C15, one end of the capacitor C16 and the negative electrode of the diode ESD1, the other end of the resistor R5, the other end of the capacitor C13, the other end of the capacitor C14, the other end of the capacitor C15, the other end of the capacitor C16 and the positive electrode of the diode ESD1 are all grounded, pin No. 8 of the detector U5 is connected to one end of the capacitor C10, one end of the capacitor C11 and the output end of the power supply circuit, and the other end of the capacitor C10 and the other end of the capacitor C11 are both grounded.

[0075] like Figure 2 As shown, the detection circuit is mainly used for

[0076] Convert AC wireless signals into DC voltage. In this embodiment, the detector U5 is a core component, and through the carefully designed capacitors C9 to C16, resistors R1 to R5 and diode ESD1 and other auxiliary components, an efficient signal conversion function is realized together. Capacitor C9 serves as an input coupling capacitor, and smoothly transmits the AC signal output by the second filter amplifier circuit to the detector U5. The RC network composed of resistor R1 and capacitor C9 performs preliminary attenuation and filtering on the input signal to reduce the interference of high-frequency noise. Pin 2 of the detector U5 is connected to the output end of the power supply circuit to provide it with a stable operating voltage. Pin 3 of the detector U5 is connected to the ground through a voltage divider network composed of resistors R2 and R3, which is used to set the reference level of the detector. The filter network composed of capacitors C13 to C16 and resistor R5 further filters out the high-frequency components in the signal after detection to ensure that the output DC voltage is stable and accurate. Diode ESD1 serves as a protection element to prevent circuit damage caused by external factors such as electrostatic discharge. The DC voltage outputted by pin 8 of detector U5 has high stability and accuracy after being processed by the circuit designed above, providing a reliable input signal for the subsequent judgment module. Such a design not only improves the efficiency of signal conversion, but also enhances the anti-interference ability and stability of the entire detection circuit.

[0077] As an optional embodiment of the present invention, optionally, the power supply circuit includes a capacitor C17, a capacitor C18 and a power supply chip U6;

[0078] One end of the capacitor C17 is connected to the power supply, pin 1 of the power chip U6 and pin 3 of the power chip U6, pin 2 of the power chip U6 is grounded, pin 5 of the power chip U6 is connected to one end of the capacitor C18, and the other end of the capacitor C18 is grounded.

[0079] Example 2

[0080] like Figure 4 As shown, a shielding alarm detection system for a rental car, the system is used for a shielding alarm detection circuit of a rental car;

[0081] The system further comprises:

[0082] A communication module, connected to the judgment module, for sending alarm information to a remote server when the judgment module triggers an alarm signal;

[0083] In the present embodiment, the communication module is a 4G communication module, which has a high data transmission rate and stability, and can ensure that the alarm information is sent to the remote server in a timely and accurate manner. The communication module communicates with the judgment module through a preset communication protocol. Once the judgment module triggers an alarm signal, the communication module starts immediately, and the alarm data containing key information such as vehicle location and alarm time are packaged and sent to the remote server. After receiving the alarm information, the remote server can respond quickly, such as notifying the management personnel or the owner, so as to take countermeasures in time. Such a design not only improves the real-time detection of the shielding alarm, but also enhances the remote monitoring and management capabilities of the entire system, and provides a strong guarantee for the safe use of the rental car. When the shielding device is turned on, the 4G signal will be blocked within 2 seconds, so it is necessary to detect that the shielding device is turned on in a very short time, and it is necessary to report the shielding alarm information to the remote server through the 4G network to achieve the timely receipt of the shielding alarm signal.

[0084] A positioning module, connected to the judgment module, for obtaining vehicle location information when the judgment module triggers an alarm signal, and sending the location information to a user terminal;

[0085] The positioning module of this embodiment is mainly composed of a GPS positioning chip or a Beidou positioning chip, which has the characteristics of high precision and low power consumption, and can obtain the location information of the vehicle in real time. Once the judgment module triggers the alarm signal, the positioning module starts immediately and quickly locks the current position of the vehicle. Subsequently, the positioning module sends the location information to the user terminal through a remote server, such as a mobile phone APP or a management background. After the user terminal receives the location information, it can intuitively view the location of the vehicle, which is convenient for timely response measures. Such a design not only improves the accuracy of vehicle location acquisition, but also enhances the response speed and practicality of the entire system when dealing with shielding alarm events, and provides strong support for the safe management and tracking of rental cars.

[0086] The control module is connected to the judgment module and is used to control the vehicle to enter a safety mode when the judgment module triggers an alarm signal.

[0087] In this embodiment, the control module is mainly composed of a microcontroller or other logic control unit, and has a high degree of reliability and response speed. Once the judgment module triggers an alarm signal, indicating the presence of shielding behavior, the control module starts immediately, and through the preset control logic, quickly controls the vehicle to enter a safe mode. The safe mode includes but is not limited to measures such as cutting off the vehicle's power system and locking the vehicle's operating interface to ensure the safety of the vehicle and personnel. At the same time, the control module can also send the startup information of the safe mode to the remote server and user terminal, so that the management personnel can understand the vehicle status in time and take further measures. Such a design not only improves the vehicle's self-protection ability when facing a shielding alarm event, but also enhances the safety and reliability of the entire system, providing a solid guarantee for the safe operation of rental vehicles.

[0088] In summary, after the acquisition circuit acquires the wireless signal, it transmits it to the first filter amplifier circuit for filtering and amplification, and the processed signal is then transmitted to the second filter amplifier circuit for further filtering and amplification. After that, the detection circuit converts the AC wireless signal into a DC voltage and transmits it to the judgment module. The judgment module determines whether the DC voltage exceeds the threshold according to the preset threshold. If it exceeds, the alarm signal is triggered and the alarm signal is sent to the alarm module, the communication module, the positioning module and the control module respectively. After receiving the alarm signal, the alarm module sends an acoustic and optical signal; the communication module sends the alarm information to the remote server; the positioning module obtains the vehicle location information and sends it to the user terminal through the remote server, and the control module controls the vehicle to enter the safety mode. The data analysis module on the remote server receives the alarm information sent by the communication module, generates an alarm report after processing and analysis, and transmits it to the alarm management module. The alarm management module triggers the corresponding alarm response mechanism according to the alarm report, and the feedback processing unit collects the feedback information of the management personnel for optimizing the system. The entire system realizes the detection, alarm and management of the shielding behavior of rental vehicles through such interactive relationships and data flows.

[0089] As another optional embodiment of the present invention, optionally, the remote server is provided with:

[0090] A data analysis module, connected to the communication module, for receiving and storing the alarm information sent by the communication module, performing data analysis on the alarm information, generating an alarm report, and identifying potential shielding behavior patterns according to the frequency characteristics and / or type characteristics of the alarm information, and sending the identified shielding behavior patterns to the user terminal;

[0091] It should be noted that the data analysis module can conduct a comprehensive and in-depth analysis of the received alarm information. It first stores these alarm information, including key data such as vehicle location and alarm time, to provide a basis for subsequent analysis and report generation. The data analysis module can also identify potential shielding behavior patterns based on the frequency characteristics or type characteristics of the alarm information. For example, if a vehicle frequently triggers an alarm, or the alarm type shows a certain regularity, the data analysis module can identify this abnormal behavior pattern and automatically mark it as a potential shielding behavior. This intelligent recognition capability not only improves the accuracy of shielding alarm detection, but also helps managers to promptly discover and respond to potential shielding risks. Once a potential shielding behavior pattern is identified, the data analysis module will immediately send this information to the user terminal. After receiving this information, the user terminal can intuitively view the details of the alarm event, including key information such as vehicle location, alarm time, and shielding behavior pattern. In this way, managers can quickly understand the actual situation of the shielding alarm and take effective countermeasures, such as contacting the owner and dispatching personnel to the scene, to ensure the safe use of the rental car.

[0092] The alarm management module is connected to the data analysis module and is used to hierarchically manage the alarms according to the severity or / and urgency of the shielding behavior pattern, and set corresponding processing procedures and response times for alarms of different levels. In this embodiment, the alarm management module can intelligently classify the alarm information, and classify the alarms into different levels, such as emergency alarms, important alarms and general alarms, according to the severity or urgency of the shielding behavior pattern. For alarms of different levels, the alarm management module will set different processing procedures and response times to ensure that managers can respond to alarm events quickly and accurately. For example, for emergency alarms, the alarm management module will immediately trigger the emergency response process and notify relevant personnel to take prompt action to minimize potential risks. For general alarms, the alarm management module will adopt a more gentle processing method, such as automatic telephone manager reminders or APP notifications, so that managers can handle them at the right time. Such a design not only improves the efficiency and accuracy of alarm processing, but also enhances the flexibility and controllability of the entire system in dealing with shielding alarm events, providing strong support for the safety management of rental cars. Through the collaborative work of the data analysis module and the alarm management module, the remote server can achieve comprehensive monitoring and management of shielded alarm information, providing managers with a powerful decision-making support tool.

[0093] As another optional embodiment of the present invention, optionally, the data analysis module includes:

[0094] A data preprocessing unit, used for preprocessing the alarm information;

[0095] It should be noted that the data preprocessing unit is responsible for cleaning, deduplicating and formatting the received alarm information to ensure the accuracy and consistency of the data. For example, duplicate alarm records are removed through data cleaning algorithms, and the data format is standardized to meet the requirements of subsequent processing.

[0096] A feature extraction unit connected to the data preprocessing unit, used to extract key features from the preprocessed data, wherein the key features include alarm time, location, signal strength and duration;

[0097] It should be noted that the feature extraction unit extracts key features from the preprocessed data, such as alarm time, location, signal strength, duration, etc., to provide a basis for subsequent analysis. The feature extraction algorithm in data mining technology can be used to extract key features that are valuable for analysis from a large amount of alarm information.

[0098] A pattern recognition unit is connected to the feature extraction unit and is used to recognize the shielding behavior pattern using the key feature.

[0099] It should be noted that the pattern recognition unit uses machine learning algorithms to analyze and identify the extracted key features to determine whether there is a shielding behavior pattern. The unit can train a classification model, take the extracted key features as input, and output a prediction result of whether it is a shielding behavior. By continuously optimizing model parameters and algorithms, the accuracy and efficiency of pattern recognition can be improved. Once the shielding behavior pattern is identified, the pattern recognition unit will send the relevant information to other parts of the data analysis module for further processing and analysis. Such a design not only improves the intelligence level of shielding behavior pattern recognition, but also provides strong support for subsequent alarm management and response measures.

[0100] As another optional embodiment of the present invention, optionally, the expression for the pattern recognition unit to recognize the shielding behavior pattern using the key feature is:

[0101]

[0102] Where P(M|F) represents the probability of the occurrence of pattern M under the condition of a given feature set F, F represents the feature set consisting of alarm time, location, signal strength and duration, M represents the potential shielding behavior pattern, e represents the base of the natural logarithm, λ represents the rate parameter of the Poisson distribution, which is used to describe the average number of alarm events per unit time, T represents the total operation time of the detection circuit, k represents the number of alarm events that occur within the total operation time T of the detection circuit, and k! represents the factorial of k. represents the standard deviation of the signal strength of the ith alarm event, S i represents the signal strength of the ith alarm event, μ S represents the mean value of signal strength, represents the standard deviation of the location of the ith alarm event, L i represents the location of the ith alarm event, μ L represents the mean of the location, β represents the parameter related to the duration distribution, which is used to describe the shape characteristics of the duration, D i Represents the duration of the i-th alarm event.

[0103] It should be noted that the above expression comprehensively considers multiple key features such as alarm time, location, signal strength and duration, and accurately identifies potential shielding behavior patterns through complex mathematical operations. Among them, P(M|F) represents the probability of pattern M appearing under the condition of a given feature set F. Feature set F consists of key features such as alarm time, location, signal strength and duration, which together reflect the characteristics of the shielding behavior pattern. The rate parameter λ of the Poisson distribution is used to describe the average number of alarm events per unit time, which reflects the distribution characteristics of the shielding behavior pattern in the time dimension. By calculating the number of alarm events that occur within the total time T of the detection circuit operation, and combining it with the λ parameter, the frequency of shielding behavior can be quantitatively analyzed.

[0104] In addition, the expression also takes into account the standard deviation σ of signal strength and location, as well as their mean μ, which are used to describe the distribution characteristics of the shielding behavior pattern in the spatial dimension. By calculating the standard deviation of the signal strength and location of each alarm event and comparing it with the mean, it can be determined whether the shielding behavior presents a certain spatial distribution law. Finally, the expression also introduces a parameter β related to the duration distribution to describe the shape characteristics of the duration. By calculating the duration of each alarm event and combining it with the β parameter, the duration of the shielding behavior can be quantitatively analyzed, thereby further revealing the characteristics of the shielding behavior pattern.

[0105] This expression provides a quantitative analysis method for the identification of shielding behavior patterns. By comprehensively considering multiple key features, the accuracy and intelligence of identification are improved. In practical applications, the expression can be appropriately adjusted and optimized according to specific alarm information and requirements to adapt to different application scenarios and requirements.

[0106] As another optional embodiment of the present invention, optionally, the alarm management module includes:

[0107] An alarm classification unit, used for classifying and managing alarms according to the severity and / or urgency of the shielding behavior pattern;

[0108] It should be noted that the alarm classification unit is responsible for classifying the received alarm information. It classifies the alarm into different levels, such as emergency alarm, important alarm and general alarm, according to the severity or urgency of the shielding behavior pattern. This hierarchical management method helps managers to respond quickly according to the urgency of the alarm and ensure the safety of the rental car.

[0109] A notification strategy unit, connected to the alarm classification unit, for formulating different notification strategies according to the alarm level;

[0110] It should be noted that the notification strategy unit will formulate different notification strategies according to the alarm level. For emergency alarms, the notification strategy unit will immediately trigger the emergency notification process, such as sending SMS, email or phone notifications, to ensure that relevant personnel can quickly receive the alarm information and take immediate action. This emergency notification method can minimize potential risks and ensure the safety of rental cars. For important alarms, the notification strategy unit will adopt a more urgent notification method, such as sending multiple SMS reminders or email notifications, and attach detailed alarm information, so that managers can understand the situation in time and take corresponding countermeasures. For general alarms, the notification strategy unit will adopt a more gentle notification method, such as sending a single SMS reminder or email notification, so that managers can handle it at the right time. This design not only improves the efficiency and accuracy of alarm notifications, but also enhances the flexibility and controllability of the entire system in dealing with alarm events of different levels, providing strong support for the safety management of rental cars. Through the collaborative work of the alarm classification unit and the notification strategy unit, the alarm management module can realize comprehensive monitoring and management of shielded alarm information, ensuring that managers can respond to alarm events quickly and accurately, and ensuring the safe use of rental cars.

[0111] an emergency response unit connected to the alarm classification unit, for automatically triggering an emergency plan upon receiving a high-level alarm, the emergency plan including automatic telephone notification of vehicle management personnel and initiation of vehicle tracking;

[0112] It should be noted that the emergency response unit can quickly and automatically trigger the emergency plan when receiving a high-level alarm. This plan covers several key measures to ensure that potential shielding risks can be quickly responded to. First, the emergency response unit will call the surveillance camera near the vehicle to obtain real-time video information around the vehicle. Through the surveillance video, managers can intuitively understand the current status of the vehicle and the surrounding environment, providing an important basis for subsequent processing. Secondly, the emergency response unit will immediately contact nearby security personnel, such as patrol members or security personnel, to notify them to go to the scene for inspection and processing. These security personnel have professional skills and experience, and can quickly judge the situation and take appropriate actions to ensure the safety of vehicles and personnel. In addition, the emergency response unit will also start the vehicle tracking function, and track the location information of the vehicle in real time through technical means such as GPS positioning or Beidou positioning. Once the vehicle is successfully located, the manager can immediately dispatch relevant personnel to the scene to take further countermeasures, such as unlocking the vehicle, restoring the power system, or starting emergency rescue. Such a design not only improves the speed and accuracy of emergency response, but also enhances the initiative and controllability of the entire system in responding to high-level alarm events, providing a solid guarantee for the safe operation of rental cars.

[0113] The feedback processing unit is used to collect feedback information from managers on the post-alarm processing results, evaluate the accuracy of the system, and optimize the system based on the evaluation results and feedback information.

[0114] It should be noted that the feedback processing unit is mainly responsible for collecting feedback information from managers on the results of alarm event processing, including but not limited to processing time, effectiveness of processing measures, whether the blocking behavior is successfully lifted, etc. By collecting this feedback information, the feedback processing unit can comprehensively evaluate the accuracy and performance of the system. For example, if the manager reports that the processing time is long or the processing measures are not effective, this may mean that the system has deficiencies in alarm detection or emergency response plans and needs to be optimized and improved.

[0115] Based on the collected feedback information, the feedback processing unit will further analyze the accuracy and reliability of the system. It can evaluate the accuracy of the system in identifying shielding behavior patterns by comparing actual alarm events with the system's detection results. At the same time, it can also evaluate the overall performance of the system in dealing with shielding alarm events based on the manager's satisfaction with the processing results. These evaluation results not only provide an important basis for the subsequent optimization of the system, but also help managers understand the actual operating status of the system so that they can make more reasonable decisions.

[0116] In order to continuously improve the performance and accuracy of the system, the feedback processing unit will also optimize the system based on the evaluation results and feedback information. This includes adjusting the algorithm parameters of alarm detection, optimizing the process of emergency plans, and enhancing the stability and reliability of the system. Through continuous iteration and optimization, the system can gradually adapt to various complex scenarios and needs, and provide more comprehensive and effective support for the safety management of rental cars. Such a design not only improves the intelligence level of the system, but also enhances the flexibility and controllability of the entire system in dealing with shielding alarm events, providing a strong guarantee for the safe operation of rental cars.

[0117] 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 invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A shielding alarm detection circuit for a rental car, characterized in that: The circuit comprises: A collection circuit, used for collecting wireless signals; A first filtering and amplifying circuit, connected to the acquisition circuit, and configured to filter and amplify the wireless signal; A second filtering and amplifying circuit, connected to the first filtering and amplifying circuit, for filtering and amplifying the wireless signal again; A detection circuit, connected to the second filter amplifier circuit, and configured to convert the AC wireless signal into a DC voltage; A judgment module, connected to the detection circuit, for judging whether the DC voltage exceeds a threshold value according to a preset value, and if so, triggering an alarm signal; An alarm module, connected to the judgment module, for receiving the alarm signal and sending out an acoustic, optical and electrical signal; The power supply circuit is used to provide stable electric energy to the detection circuit.

2. A shielding alarm detection circuit for a rental car as claimed in claim 1, characterized in that: The first filtering and amplifying circuit includes a filter U1, an amplifier U2, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, an inductor L1 and an inductor L2; One end of the capacitor C1 is connected to the output end of the acquisition circuit, the other end of the capacitor C1 is connected to pin 1 of the filter U1, pins 2, 3 and 4 of the filter U1 are all grounded, pin 5 of the filter U1 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to pin 3 of the amplifier U2, pins 1 and 2 of the amplifier U2 are both grounded, pins 4 and 5 of the amplifier U2 are connected to one end of the capacitor C3 and one end of the inductor L2, the other end of the capacitor C3 is grounded, the other end of the inductor L2 is connected to the output end of the power supply circuit and one end of the capacitor C4, and the other end of the capacitor C4 is grounded.

3. A shielding alarm detection circuit for a rental car as claimed in claim 1, characterized in that: The second filtering and amplifying circuit includes a filter U3, an amplifier U4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, an inductor L3 and an inductor L4; One end of the capacitor C5 is connected to the output end of the first filtering amplifier circuit, the other end of the capacitor C5 is connected to pin 1 of the filter U3, pins 2, 3 and 4 of the filter U3 are all grounded, pin 5 of the filter U3 is connected to one end of the capacitor C6, the other end of the capacitor C6 is connected to one end of the inductor L3, the other end of the inductor L3 is connected to pin 3 of the amplifier U4, pins 1 and 2 of the amplifier U4 are grounded, pins 4 and 5 of the amplifier U4 are connected to one end of the capacitor C7 and one end of the inductor L4, the other end of the capacitor C7 is grounded, the other end of the inductor L4 is connected to the output end of the power supply circuit and one end of the capacitor C8, and the other end of the capacitor C8 is grounded.

4. A shielding alarm detection circuit for a rental car as claimed in claim 1, characterized in that: The detection circuit includes capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor C13, capacitor C14, capacitor C15, capacitor C16, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, diode ESD1 and detector U5; One end of the capacitor C9 is connected to the output end of the second filter amplifier circuit, the other end of the capacitor C9 is connected to one end of the resistor R1 and pin 1 of the detector U5, the other end of the resistor R1 is grounded, pin 2 of the detector U5 is connected to the output end of the power supply circuit, pin 3 of the detector U5 is connected to one end of the resistor R2 and one end of the resistor R3, the other end of the resistor R2 is grounded, the other end of the resistor R3 is connected to one end of the capacitor C12, one end of the resistor R4 and pin 6 of the detector U5, the other end of the capacitor C12 is connected to pin 4 of the detector U5, and the detector Pin No. 5 of U5 is grounded, the other end of the resistor R4 is connected to one end of the resistor R5, one end of the capacitor C13, one end of the capacitor C14, one end of the capacitor C15, one end of the capacitor C16 and the negative electrode of the diode ESD1, the other end of the resistor R5, the other end of the capacitor C13, the other end of the capacitor C14, the other end of the capacitor C15, the other end of the capacitor C16 and the positive electrode of the diode ESD1 are all grounded, pin No. 8 of the detector U5 is connected to one end of the capacitor C10, one end of the capacitor C11 and the output end of the power supply circuit, and the other end of the capacitor C10 and the other end of the capacitor C11 are both grounded.

5. A shielding alarm detection circuit for a rental car as described in claim 1, 2, 3 or 4, characterized in that: The power supply circuit includes capacitor C17, capacitor C18 and power supply chip U6; One end of the capacitor C17 is connected to the power supply, pin 1 of the power chip U6 and pin 3 of the power chip U6, pin 2 of the power chip U6 is grounded, pin 5 of the power chip U6 is connected to one end of the capacitor C18, and the other end of the capacitor C18 is grounded.

6. A shielding alarm detection system for rental vehicles, characterized in that: The system comprises a shielding alarm detection circuit for a rental car as claimed in any one of claims 1 to 5; The system further comprises: A communication module, connected to the judgment module, for sending alarm information to a remote server when the judgment module triggers an alarm signal; A positioning module, connected to the judgment module, for obtaining vehicle location information when the judgment module triggers an alarm signal, and sending the location information to a user terminal; The control module is connected to the judgment module and is used to control the vehicle to enter a safety mode when the judgment module triggers an alarm signal.

7. A shielding alarm detection system for rental vehicles as claimed in claim 6, characterized in that: The remote server is provided with: A data analysis module, connected to the communication module, for receiving and storing the alarm information sent by the communication module, performing data analysis on the alarm information, generating an alarm report, and identifying potential shielding behavior patterns according to the frequency characteristics and / or type characteristics of the alarm information, and sending the identified shielding behavior patterns to the user terminal; The alarm management module is connected to the data analysis module and is used to trigger a corresponding alarm response mechanism according to the alarm report generated by the data analysis module.

8. A shielding alarm detection system for rental vehicles as claimed in claim 7, characterized in that: The data analysis module includes: A data preprocessing unit, used for preprocessing the alarm information; A feature extraction unit connected to the data preprocessing unit, used to extract key features from the preprocessed data, wherein the key features include alarm time, location, signal strength and duration; A pattern recognition unit is connected to the feature extraction unit and is used to recognize the shielding behavior pattern using the key feature.

9. A shielding alarm detection system for rental vehicles as claimed in claim 8, characterized in that: The expression for the pattern recognition unit to recognize the shielding behavior pattern using the key feature is: Where P(M|F) represents the probability of the occurrence of pattern M under the condition of a given feature set F, F represents the feature set consisting of alarm time, location, signal strength and duration, M represents the potential shielding behavior pattern, e represents the base of the natural logarithm, λ represents the rate parameter of the Poisson distribution, which is used to describe the average number of alarm events per unit time, T represents the total operation time of the detection circuit, k represents the number of alarm events that occur within the total operation time T of the detection circuit, and k! represents the factorial of k. represents the standard deviation of the signal strength of the ith alarm event, S i represents the signal strength of the ith alarm event, μ S represents the mean value of signal strength, represents the standard deviation of the location of the ith alarm event, L i represents the location of the ith alarm event, μ L represents the mean of the location, β represents the parameter related to the duration distribution, which is used to describe the shape characteristics of the duration, D i Represents the duration of the i-th alarm event.

10. A shielding alarm detection system for rental vehicles as claimed in claim 7, characterized in that: The alarm management module comprises: An alarm classification unit, used for classifying and managing alarms according to the severity and / or urgency of the shielding behavior pattern; A notification strategy unit, connected to the alarm classification unit, for formulating different notification strategies according to the alarm level; an emergency response unit connected to the alarm classification unit, for automatically triggering an emergency plan upon receiving a high-level alarm, the emergency plan including automatic telephone notification of vehicle management personnel and initiation of vehicle tracking; The feedback processing unit is used to collect feedback information from managers on the post-alarm processing results, evaluate the accuracy of the system, and optimize the system based on the evaluation results and feedback information.

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