CN219122732U

CN219122732U - Composite pass card

Info

Publication number: CN219122732U
Application number: CN202223582013.3U
Authority: CN
Inventors: 马超; 马文彬
Original assignee: Beijing Wanji Technology Co Ltd
Current assignee: Beijing Wanji Technology Co Ltd
Priority date: 2022-12-31
Filing date: 2022-12-31
Publication date: 2023-06-02
Anticipated expiration: 2032-12-31

Abstract

The application that this application provided provides compound access card, this compound access card has shielding detection function, and this compound access card includes: the system comprises a main control module, a DSRC communication module, a communication coil and a magnetic field detection module; the magnetic field detection module is in bidirectional communication connection with the communication coil and the main control module 2; the main control module 2 is also connected with a DSRC communication module; the magnetic field detection module is used for detecting a target object in the environment, and the target object induces magnetic field change of the environment. In the present application, by adding a magnetic field detection module to a composite access card (CPC), shielding or interference identification of a medium (for example, metal, a wave-absorbing material, etc.) having a large influence on a magnetic field is achieved by detecting a change in a spontaneous magnetic field around the CPC, and the magnetic field detection module is not influenced by external devices, environmental signals, etc.

Description

Composite pass card

Technical Field

The present application relates to the field of automotive electronics, and in particular, to a composite pass card.

Background

The special short range communication technology (DSRC) is a communication technology special for long-distance radio frequency identification in the intelligent traffic field, is widely applied in the Electronic Toll Collection (ETC) field, and is a DSRC product for solving the highway path identification problem in the manual semi-automatic toll collection (MTC) field, and the special short range communication technology (CPC) is characterized by having 5.8GHz DSRC and 13.56MHz communication functions and supporting the reading and writing functions of entrance information and path information. CPC is issued to MTC vehicles in an entrance lane of a toll gate of a closed toll gate, CPC cards are placed at any positions in the vehicles, a path identification function is performed in a highway, and an exit lane is retracted and path information is read, so that the vehicles are reused. Because the CPC application scene has larger degree of freedom, the situation that the composite pass card is shielded by people cannot be avoided, so that the purpose of escaping or paying less road fees is achieved. Therefore, how to detect whether the composite access card is artificially shielded is an important issue to be solved.

Disclosure of Invention

The purpose of the application is to provide a composite pass card, which comprises a main control module, a DSRC communication module, a communication coil and a magnetic field detection module;

the magnetic field detection module is in bidirectional communication connection with the communication coil and the main control module;

the main control module is also connected with a DSRC communication module;

the magnetic field detection module is used for detecting a target object in the environment, and the target object induces magnetic field change of the environment.

In one embodiment, the magnetic field detection module comprises a magnetic field emission unit, a magnetic field detection coil, a magnetic field receiving unit and a magnetic field intensity measuring unit,

the magnetic field transmitting unit is connected with the main control module and the magnetic field detecting coil and is used for generating magnetic field signals;

the magnetic field receiving unit is connected with the magnetic field intensity measuring unit and the magnetic field detection coil and is used for detecting and conditioning the magnetic field signals;

the magnetic field intensity measuring unit is connected with the main control module and the magnetic field receiving unit and is used for calculating signals output by the magnetic field receiving unit.

In one embodiment, the signal frequency of the magnetic field emission unit is 13.56MHz.

In one embodiment, the magnetic field receiving unit is composed of a detection circuit and a signal conditioning circuit, wherein the detection circuit is used for detecting magnetic field signals, and the conditioning circuit is used for conditioning the magnetic field signals.

In one embodiment, the magnetic field strength measuring unit is composed of an AD conversion circuit and an RSSI calculation circuit, and is used for carrying out AD conversion and RSSI calculation on the signal output by the magnetic field receiving unit.

In one embodiment, the magnetic field detection coil may be provided independently or in common with the communication coil.

In one embodiment, the composite access card further includes a power module that provides power to other modules of the composite access card.

In one embodiment, the composite pass card further comprises a security module connecting the master control module and the communication coil.

Additional features and advantages of the present application will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and, together with the description, do not limit the application. In the drawings:

FIG. 1 is a schematic diagram of a composite access card according to an embodiment of the present application;

FIG. 2 is a block diagram of a magnetic field detection module according to another embodiment of the present application;

fig. 3 is a schematic structural diagram of a composite access card according to another embodiment of the present application.

Detailed Description

The following detailed description of specific embodiments of the present application refers to the accompanying drawings. It should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application.

The existing shielding detection scheme for CPC or OBU is mainly realized by the following modes:

(1) Adding an environment signal-to-noise detection module, and identifying by detecting the signal-to-noise ratio in the environment;

(2) Adding a Bluetooth module, and identifying by detecting the Bluetooth signal intensity in the environment;

(3) A wireless communication module is added and is identified by periodic communication with an external intrinsic device or RSU or the like.

These schemes have some defects, such as (1) detection of external environmental noise, complex method and relatively high cost; while solutions (2) and (3) need to be implemented by means of external devices or signals, reliability is a risk.

Referring to fig. 1, the present application provides a composite access card having a shielding detection function, the composite access card including: comprises a main control module 2, a DSRC communication module 3, a communication coil 5 and a magnetic field detection module 6; the magnetic field detection module 6 is in bidirectional communication connection with the communication coil 3 and the main control module 2; the main control module 2 is also connected with a DSRC communication module 3; the magnetic field detection module 6 is configured to detect a target object in the environment, where the target object induces a magnetic field change of the environment. It should be noted that the magnetic field detection module may determine whether a signal is shielded or disturbed in the environment based on a magnetic field change of the environment, and how to determine whether a signal is shielded or disturbed is well known in the art.

In the present application, by adding a magnetic field detection module to a composite access card (CPC), shielding or interference identification of a medium (for example, metal, a wave-absorbing material, etc.) having a large influence on a magnetic field is achieved by detecting a change in a spontaneous magnetic field around the CPC, and the magnetic field detection module is not influenced by external devices, environmental signals, etc.

With continued reference to fig. 1 and with further reference to fig. 2, in one embodiment, the magnetic field detection module 6 includes a magnetic field emission unit 100, a magnetic field detection coil 103, a magnetic field reception unit 101, and a magnetic field strength measurement unit 102; as shown in fig. 2, in this embodiment, the magnetic field emission unit 100 is connected to the main control module 1 and the magnetic field detection coil 103, and is configured to generate a magnetic field signal, where the signal frequency may be 13.56MHz; the magnetic field receiving unit 101 is connected with the magnetic field intensity measuring unit 102 and the magnetic field detecting coil 103, and consists of a detection circuit 1011 and a signal conditioning circuit 1012, and is used for detecting and conditioning the magnetic field signal; the magnetic field intensity measuring unit 102 is connected to the main control module 1 and the magnetic field receiving unit 101, and is composed of an AD conversion circuit 1021 and an RSSI calculation circuit 1022, and is configured to perform AD conversion and RSSI (received signal intensity) calculation on the signal output from the magnetic field receiving unit 101.

In one alternative embodiment, referring to fig. 1 and 3, the magnetic field detection coil 103 is a separate coil for sensing changes in magnetic field. By implementing the embodiment, the CPC can automatically detect the change of the magnetic field intensity, so that whether the CPC is in a shielded or interfered state or not is detected, the detection function is reliable and convenient, and the implementation cost is low.

Optionally, referring to fig. 1 and 3, the composite access card further includes a power module 1, and the power module 1 supplies power to other modules of the composite access card. Optionally, referring to fig. 1 and 3, the composite pass card further includes a security module, and the security module connects the main control module and the communication coil.

As shown in fig. 3, the magnetic field detection module 6 includes a magnetic field emission unit 100, a magnetic field detection coil 103, a magnetic field receiving unit 101, and a magnetic field intensity measuring unit 102; in this embodiment, the magnetic field detection coil 103 is shared with the communication coil 5, and is used for sensing the change of the magnetic field; the magnetic field emission unit 100 is connected with the main control module 1 and the magnetic field detection coil 103, and is used for generating a magnetic field signal, and the signal frequency is 13.56MHz; the magnetic field receiving unit 101 is connected with the magnetic field intensity measuring unit 102 and the magnetic field detecting coil 103, and consists of a detection circuit 1011 and a signal conditioning circuit 1012, and is used for detecting and conditioning the magnetic field signal; the magnetic field intensity measuring unit 102 is connected to the main control module 1 and the magnetic field receiving unit 101, and is composed of an AD conversion circuit 1021 and an RSSI calculation circuit 1022, and is configured to perform AD conversion and RSSI (received signal intensity) calculation on the signal output from the magnetic field receiving unit 101. By implementing the embodiment, the use of an independent coil can be omitted, and the cost is further reduced on the premise of realizing the shielding detection function.

The basic principle of the circuit module of the application is as follows: the main control module 1 controls the magnetic field transmitting unit 100 to transmit carrier signals with fixed frequency and power, the magnetic field intensity measuring unit 102 measures the signal intensity of the signal output by the magnetic field receiving unit 101 and outputs a digital test result to the main control module 1; when the CPC card is in an unshielded or interference-free environment, the acquired signal intensity is a, when the CPC card is placed near a medium (such as metal, wave-absorbing material and the like) with great influence on a magnetic field, the acquired signal intensity is b, and when the difference between the a and the b reaches a certain degree, the CPC card is judged to be in a shielded or interference state.

The preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present application within the scope of the technical concept of the present application, and all the simple modifications belong to the protection scope of the present application.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations are not described further.

Moreover, any combination of the various embodiments of the present application may be made, as long as it does not depart from the spirit of the present application, which should also be construed as the subject matter of the present application.

Claims

1. The composite pass card is characterized by comprising a main control module, a DSRC communication module, a communication coil and a magnetic field detection module;

the main control module is also connected with a DSRC communication module;

2. The composite pass card of claim 1, wherein the magnetic field detection module comprises a magnetic field emission unit, a magnetic field detection coil, a magnetic field receiving unit, and a magnetic field intensity measuring unit,

3. The composite pass card of claim 2, wherein the signal frequency of the magnetic field emission unit is 13.56MHz.

4. The composite pass card of claim 2, wherein the magnetic field receiving unit is comprised of a detection circuit for detecting a magnetic field signal and a signal conditioning circuit for conditioning the magnetic field signal.

5. The composite pass card according to claim 2, wherein the magnetic field strength measuring unit is composed of an AD conversion circuit and an RSSI calculation circuit for AD conversion and RSSI calculation of the signal output from the magnetic field receiving unit.

6. The composite pass card of claim 1, wherein the magnetic field detection coil may be provided independently or in common with the communication coil.

7. The composite pass card of claim 1, further comprising a power module that provides power to other modules of the composite pass card.

8. The composite pass card of claim 1, further comprising a security module connecting the master control module and the communication coil.