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Car Equipment

A vehicle-mounted device and circuit board technology, applied in ticketing equipment, instruments, etc., can solve problems such as false wake-up of vehicle-mounted devices, reduced battery life, communication failure, etc., to reduce the probability of false wake-up, isolate electromagnetic signal interference, and improve anti-interference performance effect

Active Publication Date: 2016-08-03
CHINA TRANSINFO TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex electromagnetic environment in the vehicle, when the vehicle-mounted equipment communicates with the roadside equipment, it is susceptible to interference from various electromagnetic signals in space, resulting in communication failure.
In addition, when the vehicle-mounted equipment is sleeping, the electromagnetic radiation interference of other electronic devices existing inside and outside the vehicle may easily cause false wake-up of the vehicle-mounted equipment (OBU). Reduced battery life

Method used

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Effect test

Embodiment 1

[0024] This embodiment shows an OBU (vehicle-mounted unit) equipped with a metal shield, and the OBU includes a circuit board on which a microwave communication circuit of the OBU is arranged.

[0025] A certain number of positioning devices are arranged around the microwave communication circuit on the circuit board, through which the metal shield can be accurately installed on the corresponding position on the circuit board. The positioning device may be any appropriate structure, such as a positioning groove, a positioning hole or a card slot.

[0026] The metal shielding cover is installed on the circuit board through the positioning device, and is electrically connected with the circuit board. After installation, an electromagnetic shielding cavity is formed between the metal shielding cover and the circuit board, and the microwave communication circuit is just located in the cavity, and resists external electromagnetic interference through the metal shielding cover and t...

Embodiment 2

[0029] refer to figure 1 , shows a cross-sectional view of a metal shield of a vehicle-mounted device according to Embodiment 2 of the present application.

[0030] The metal shield 1 in this embodiment is shaped as a cube with one side open, but not limited thereto. In practical applications, those skilled in the art can set the metal shield to an appropriate shape according to the microwave communication circuit of the OBU. The metal shield 1 of this embodiment is formed by cutting and bending a metal plate, and its shape and size are processed according to the size of the microwave communication circuit on the circuit board 6 that needs electromagnetic shielding. The metal for processing the metal shield 1 can be the usual metal used for making shields, such as copper alloy or iron alloy. The four sides of the metal shield 1 are welding surfaces, and the welding surface is provided with an installation position limiting structure 9 (such as figure 2 shown in), and the po...

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Abstract

The invention provides a vehicle-mounted device which comprises a metal shielding cover. The metal shielding cover is installed on a circuit board through a locating device on the circuit board where a microwave communication circuit arranged on the vehicle-mounted device is located, and the metal shielding cover is in electric connection with the circuit board. An electromagnetism shielding cavity body is formed between the metal shielding cover and the circuit board. The microwave communication circuit is located on the circuit board in the electromagnetism shielding cavity body. Through the vehicle-mounted device, anti-disturbance performance of the vehicle-mounted device is improved, and accordingly a success ratio of communication of the vehicle-mounted device is improved, and the probability that the vehicle-mounted device is mistakenly waked is decreased.

Description

technical field [0001] The present application relates to the field of microwave communication, in particular to an on-board unit (On-Board Unit, OBU). Background technique [0002] ETC (ElectronicTollcollection, electronic toll collection system) means that when a vehicle passes through a toll booth, it realizes vehicle identification, information writing, and automatically deducts the corresponding funds from the pre-bound IC card or bank account. It is an international effort Develop and popularize an electronic toll collection system for roads, bridges and tunnels. [0003] The ETC system is composed of background system, lane controller, RSU (Road-SideUnit, roadside unit) and OBU. Among them, the lane controller, RSU and OBU form the ETC front-end system to realize the control, identification and charging of passing vehicles in the lane; the back-end system is connected to the service network for liquidation and fee settlement. As the main component of the ETC system,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G07B15/06
Inventor 刘起昌赵志泳周双全张志平夏曙东
Owner CHINA TRANSINFO TECH CORP
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