CN204155321U - A kind of access device of rear-loading type electronic tag - Google Patents

Abstract

The utility model discloses a rear-mounted electronic label access device, which comprises a microprocessor, a power supply module, a radio frequency processing module, an antenna and a communication interface. The radio frequency processing module and antenna communicate with the electronic tag wirelessly to obtain all relevant information of the electronic tag; the access device of the rear-mounted electronic tag can exist as an external device alone, and it can be directly connected to the on-board controller through a wired method for data processing when necessary. Transmission, to upload the electronic tag information required by the on-board controller. Therefore, without changing the current traditional working mode, the connection between the electronic tag OBU and the vehicle is truly realized, and at the same time, the technical requirements for this purpose are also reduced. cost and time cost.

Description

An access device for rear-mounted electronic tags

technical field

The utility model relates to the technical field of intelligent transportation and electronic toll collection (ETC), in particular to an access device for a rear-mounted electronic label.

Background technique

ETC (Electronic Toll Collection, electronic toll collection system) is the most advanced toll collection system in the world at present, and it is one of the service functions of the intelligent transportation system. Passing vehicles can realize automatic toll collection without stopping when passing through the crossing. ETC is mainly composed of two parts, namely the on-board unit OBU (On Board Unit) and the roadside unit RSU (Road Side). The OBU communicates. On-board unit OBU is one of the key equipment in ETC.

The domestic OBU is generally a rear-mounted OBU, which is directly pasted on the front windshield of the car with glue, and only the mechanical anti-disassembly button is used to judge whether the electronic label is available, and the connection between the electronic label OBU and the vehicle is not really realized; secondly, At present, there are a small number of front-mounted OBUs that need to change the working mode of the electronic tag, and the strong cooperation of the vehicle supplier is required to realize the real connection between the electronic tag and the vehicle, which greatly increases the cost; thirdly, the current rapid development of technology and the variety of on-board equipment Many of them can exist independently, and can communicate with the on-board system through cable connection or interface insertion. However, in the technical field of electronic toll collection, it is not possible to control the rear-mounted electronic tags through the on-board system. Therefore, how convenient Connecting the rear-mounted electronic tags to the vehicle system has become an urgent problem to be solved.

Utility model content

In order to overcome the shortcomings of the above-mentioned prior art, the utility model provides a rear-mounted electronic label access device, which can realize the real connection between the OBU and the vehicle without changing the working mode of the traditional rear-mounted OBU. The on-board controller can easily obtain the relevant information of the electronic tag OBU.

The purpose of this utility model is to provide an access device for rear-mounted electronic tags, which includes a power supply module, a microprocessor module, a radio frequency processing module, an antenna, and a communication interface; The tag access device supplies power; the microprocessor acts as the control unit of the post-mounted electronic tag access device, coordinating the workflow of the entire device; the radio frequency processing module includes a receiving circuit and a transmitting circuit, and cooperates with the radio frequency switch and the antenna to form the main body of wireless communication , the radio frequency processing module and antenna belong to the 5.8GHz frequency band in the technical field of electronic toll collection (ETC), which meets the requirements of dedicated short-range communication technology (DSRC). The radio frequency processing module and the antenna cooperate with the electronic label OBU to communicate wirelessly, which is convenient Obtain relevant information; the communication interface is CAN interface and/or USB interface, and the on-board electronic tag access device communicates with the vehicle controller through the above-mentioned interface, wherein the communication interface part includes a control circuit and a transceiver circuit, controlled by a microprocessor It can normally receive commands and make relevant responses, so as to realize the connection between the rear-mounted electronic tag OBU and the vehicle.

Compared with the prior art, the beneficial effect of the utility model is that the connection between the electronic tag OBU and the vehicle can be truly realized without changing the current traditional working mode, and the information of the OBU can be read wirelessly and stored in the microprocessor , when connected to the on-board controller of the vehicle through a wired method, the OBU information stored in it is transmitted to the on-board controller, so that the on-board controller can know the relevant information of the electronic tag OBU in time; The resulting technical cost and time cost.

Description of drawings

Fig. 1 is the functional block diagram of the principle of the utility model.

Fig. 2 is a composition block diagram of the radio frequency processing module in the utility model.

Fig. 3 is a block diagram of CAN interface and/or USB interface in the utility model.

Detailed ways

The utility model is further described below through specific embodiments in conjunction with the accompanying drawings. Apparently, the described embodiments are for explaining the present utility model in detail, and it does not mean that the specific implementation of the present utility model is only limited thereto. For those skilled in the technical field to which the utility model belongs, it is easy to make changes and replacements on the basis of the utility model.

1 is a block diagram of the functional modules of the principle of the present invention, including the following modules: microprocessor 102, power supply module 108, radio frequency processing module 101, antenna 106, CAN interface 103 and/or USB interface 105. Other modules, such as the electronic tag 107 and the vehicle-mounted controller 104 are independent of the rear-mounted electronic tag access device, which is only convenient for explaining their working relationship. The power supply module 108 may include a power conversion circuit, such as LDO and related filter devices and voltage adjustment devices, to supply power for the access device of the rear-mounted electronic label, specifically as power supply for the microprocessor 102 and the radio frequency processing module 101; the radio frequency processing The module 101 cooperates with the antenna 106, and communicates with the electronic tag 107 through wireless microwave. When the radio frequency processing module 101 sends a command through the antenna 106, the electronic tag 107 receives the command and analyzes it, and then responds to the post after corresponding processing and framing. The access device of the mounted electronic tag, and obtains all relevant information of the OBU and stores it in the storage space of the microprocessor 102; the microprocessor 102 communicates with the vehicle-mounted The controller 104 communicates and transmits information to each other, which can include system information such as vehicle identifiers and OBU anti-disassembly, and can solve the disadvantage that traditional OBUs cannot really be bound to vehicles without changing the working mode of rear-mounted OBUs.

As shown in FIG. 2 , the radio frequency processing module is composed of a radio frequency chip 202 , a transmitting circuit 201 , a receiving circuit 205 and a switch 203 . The radio frequency chip 202 and the antenna 204 may belong to the 5.8GHz frequency band. Microprocessor 206 and antenna 204 are only for describing the principle of operation. The radio frequency chip 202 is connected to the microprocessor 206 through a serial bus, and there are also control lines and interrupt lines; the microprocessor 206 provides two pins to control the switch 203, and switch to the transmitting state or the receiving state according to the working state. This is only an example of an embodiment, and those skilled in the art can easily think of replacing the switching switch 203 with a switching diode or other devices to achieve this function, or through a control pin through an inverter and at the same time State switching should also be within the protection scope of this patent.

Fig. 3 is the block diagram of CAN interface and/or USB interface in the utility model, mainly comprises control circuit 302 and transceiver circuit 303, communicates with above-mentioned two modules by microprocessor 301 and vehicle-mounted controller 304. The communication process is realized by software, which can be easily imagined by those skilled in the art. The circuit composition of this module is known knowledge and will not be repeated here.

The above is a comparatively preferred specific implementation of the utility model, and only its principle has been set forth, which is only used to help understand the method and core idea of the utility model, but the protection scope of the utility model is not limited to Therefore, anyone skilled in the art, based on the idea of the utility model, makes slight modifications to the specific implementation and technical solutions, which should be included in the protection scope of the utility model.

Claims (4)

1. an access device for rear-loading type electronic tag, is characterized in that: comprise microprocessor, power module, radio frequency processing module, antenna and communication interface.

2. the access device of a kind of rear-loading type electronic tag according to claim 1, is characterized in that, described radio frequency processing module comprises receiving loop and launching circuit, jointly forms radio communication main body with antenna.

3. the access device of a kind of rear-loading type electronic tag according to claim 1, is characterized in that, described communication interface can be CAN interface and/or USB interface.

4. the access device of a kind of rear-loading type electronic tag according to claim 2, is characterized in that, described radio frequency processing module belongs to 5.8GHz frequency range, and described antenna is 5.8GHz antenna, carries out information interaction with electronic tag.