CN201854272U

CN201854272U - Vehicle-mounted data transfer unit (DTU) plate

Info

Publication number: CN201854272U
Application number: CN2010202839600U
Authority: CN
Inventors: 刘�东
Original assignee: GLODIO TECHNOLOGIES Co Ltd
Current assignee: GLODIO TECHNOLOGIES Co Ltd
Priority date: 2010-08-04
Filing date: 2010-08-04
Publication date: 2011-06-01
Anticipated expiration: 2020-08-04

Abstract

The utility model relates to a vehicle-mounted communication device, in particular to a vehicle-mounted data transfer unit (DTU) plate, which comprises a central processing unit (CPU), a wideband code division multiple access 3rd-generation (WCDMA 3G) module, a subscriber identity module (SIM) card and a power supply system, wherein the CPU is connected with the WCDMA 3G module, the WCDMA 3G module is connected with the SIM card, the vehicle-mounted DTU plate also comprises an interface control circuit for realizing message interaction with a global positioning system (GPS) to realize voice service and message transfer of control information, the interface control circuit comprises a universal asynchronous receiver/transmitter (RART) interface, a universal serial bus (USB) interface and an audio frequency interface, the interface control circuit is connected onto the WCDMA 3G module, and the power supply system provides electric power for the WCDMA 3G module and the interface control circuit. The vehicle-mounted DTU has all vehicle-mounted item functions on markets at present, in addition, a small space is needed for installation, low voltage is needed, the interface is simple, and the vehicle-mounted DTU plate has low dependency on vehicles.

Description

A kind of vehicle-mounted DTU plate

Technical field

The utility model relates to a kind of vehicular communication unit, relates in particular to a kind of vehicle-mounted DTU plate.

Background technology

All separate the separating of onboard system of automobile industry client use at present, device association such as sound equipment, navigation is relatively poor, and the independent quotation of each equipment is all than higher, the client wants equipment such as own automobile assembling sound equipment, navigation, and estimated amount is about 10,000 yuan, and all install step by step in each automobile decoration shop of process, not only product quality can not guarantee, and cost an arm and a leg, if each accessory current/voltage fluctuation of service also can influence the car performance, risk is bigger.The vehicle-mounted function of surfing the Net of 3G aspect blank out especially at home, and utilization has abroad been arranged in these areas.

Summary of the invention

For overcoming the above problems, the utility model provide a kind of cost less, save space, simple, convenient vehicle-mounted DTU plate.

A kind of vehicle-mounted DTU plate, described DTU plate comprises CPU, WCDMA 3G module, SIM card and power-supply system, CPU is connected with WCDMA 3G module, WCDMA 3G module is connected with SIM card, also comprise with gps system and carry out interacting message, realize the interface control circuit of the message transmission of voice service and control information, described interface control circuit comprises UART interface, USB interface and Audio audio interface, described interface control circuit is connected on the WCDMA 3G module, and power-supply system provides electric power for WCDMA 3G module and interface control circuit.

As a kind of improvement of the present utility model, described Audio audio interface provides the audio frequency input/output signal, realizes the speech channel between DTU plate and the gps system.

As a kind of improvement of the present utility model, described CPU adopts ARM7.

As a kind of improvement of the present utility model, described WCDMA 3G module adopts MU103/203 module or MU723 high-speed data module.

As a kind of improvement of the present utility model, the direct paster of described SIM card is to the PCB circuit board.

The purpose of this project research is that state-of-the-art network (3G) in the present industry is linked to each other with automobile, and the vehicle-mounted DTU of 3G will realize: functions such as DVD, navigation, 3G phone, 3G online.The car entertainment information system that has these functions mainly is to utilize technology such as computer software, wireless telecommunications, multimedia to realize functions such as multimedia recreation, GPS location navigation, wireless Internet access, really makes vehicle intellectualized.The vehicle-mounted DTU of 3G is because it has comprised the function of all vehicle-mounted projects in the market, and installation footprint is little, and required voltage is little, and interface is simple, and is not high to the car dependence, makes it to become direct, the most effective instrument that car load enterprise seizes vehicle-mounted market.

Because the passage that the vehicle-mounted DTU of 3G provides automobile to be connected with network makes it in time to upload data for automobile, and can share information with the background information system whenever and wherever possible, and share information with the operator.The vehicle-mounted DTU of 3G will play very important effect as wireless terminal in the research and development of M2M, become the bridge of linking up between the Internet, the network of communication lines, the Internet of Things.

Description of drawings

Fig. 1 is the structural representation that the utility model is connected with GPS;

Fig. 2 is the utility model 3G-GPS caller handler flow chart;

Fig. 3 is the called process chart of the utility model 3G-GPS;

Fig. 4 is the utility model PTT process chart;

Fig. 5 is the DTU schematic diagram of the utility model band video.

Embodiment

The vehicle-mounted DTU plate of 3G is as the MODEM plate in vehicle-bone 3 G-gps system, be built on the 3G-GPS circuit board, can be gps system provides based on the wireless Internet access of the WCDMA of CHINAUNICOM network and the passage of speech communication, can provide the interface that is simple and easy to usefulness to gps system, realize that traditional GPS directly upgrades to 3G-GPS.As shown in Figure 1, the utility model comprises following assembly:

1, main chip

1) CPU: adopt ARM7;

2) WCDMA wireless module: adopt the MU103/203 module of the vehicle-mounted special use of Huawei, adopt the vehicle-mounted specialized high-speed data module of the MU723 of Huawei when the later stage need be supported Streaming Media;

3) SIM card: adopt UNICOM's special SIM card, directly paster reaches the purpose of binding machine and card and antidetonation to the PCB circuit board;

4) power interface/conversion chip: adopt import power supply special chip;

5) other chip adopts the mainstream chip of low-power consumption, stable performance;

2, interface specification

1) power supply

Provide DC power supply by USB interface to the WCDMA_MODEM plate by the vehicle GPS system, voltage is more than the 5V, and electric current is more than the 1.6A;

2) UART interface (serial ports):

Support 3 line serial ports patterns, UART baud rate acquiescence 115.2kbit/s.The message interacting channel that is used for 3G-DTU and gps system realizes the message transmission of voice service and control information.

The UART interface adopts 2 cores or 3 core pins;

3) USB interface

USB interface and 3G driver cooperate, and can map out three independently functional interfaces, map out 3 com ports successively and are respectively:

The MODEM mouth of " Huawei Mobile Connect-3G Modem "---be used for external dial-up connection, carry out data traffic flow and transmit;

The DIAG mouth of " 3G Application Interface "---be used for background debug, can be used for carrying out software upgrading and grab LOG;

The PC UI mouth of " 3G PC UI Interface "---be used to send AT order and result and report.

The usb bus supply power voltage is provided by native system inside, does not need the outside to provide.Simultaneously, because USB interface does not externally provide the usb bus power supply, can only be as the slave unit of usb bus.

The UART interface adopts 2 core pins, as following table:

Signal name

Describe

USB_D-?	The usb data line
		USB_D+?	The usb data line

4) Audio audio interface

The audio frequency input/output signal is provided, realizes the speech channel between 3G-DTU and the gps system;

The UART interface adopts 4 core pins, as following table; Signal definition is as follows:

Signal name	Describe
		MIC_N?	Audio input signal is negative
MIC_P?	Audio input signal just
		EAR_N?	Audio output signal is negative
EAR_P?	Audio output signal just

Audio input channel is the fully differential signal, and its anti-radio frequency interference is functional, need not to add audio frequency amplifier.

Audio frequency output all can drive the receiver of 32ohm impedance, and the loud speaker as need driving 8ohm impedance needs to increase in addition audio power amplifier circuit.

5) software interface

Original gps system is all adopted at phonetic dialing interface, the interface that surfs the web, interface, PTT call center etc., need not do any change;

The utility model vocational work flow process is as follows:

1, data service: the 3G-DTU plate is connected by USB with gps system, drive USB (different according to the difference of GPS producer model and employing operating system by gps system, provide driver to be embedded in the GPS software systems by 3G-DTU producer), and dial up on the telephone, just can realize the normal network browsing and the network consulting, information service.

2, speech business: the 3G-DTU plate is connected with the UART serial ports of gps system by standard, carries out interacting message by the privately owned communications protocol in the inside that defines between gps system and the 3G-DTU.Gps system is issued the DTU plate with all voice associative operations (comprising called number, dislodging machine etc.) of dialing interface with massage pattern, and finishes all audio calls by the 3G-DTU plate and handle.Be illustrated in figure 2 as 3G-GPS caller handler flow chart, Fig. 3 be shown in the called process chart of 3G-GPS.

3, PTT business: the 3G-DTU plate is connected with the UART of gps system by standard, is undertaken alternately by the privately owned communications protocol in inside.The information that gps system is relevant with " PTT " in the dialing interface (as call center numbers etc.) issue the 3G-DTU plate with massage pattern, and finish all audio calls by the DTU plate and handle.As PTT handling process shown in Fig. 4 is.

In addition as shown in Figure 5, described gps system is provided with video capability.It is with not compare the main distinction with the DTU of video as follows:

1) in order to support streaming media service, CPU adopts the higher ARM9 of processing speed (recommend to adopt 3512 chips or the TI-Leonardo da Vinci chip of Huawei-sea lion, ASC coding and decoding video+ARM9 function is provided);

2) in order to support streaming media service, the 3G module adopts high speed WCDMA chip (recommend to adopt the MU723 chip of Huawei, it is descending that flank speed can reach 7.2M/14.4M);

3) Streaming Media handling process: the signal that becomes standard 656 forms after video and audio signal is encoded through CODEC (or CMOS module such as OV7725 chip), after handling through CPU-3512 again, H.263/264/MPEG4, what be converted to standard waits Media Stream, can insert the 3G-WCDMA wireless module and handle.

4) adopt the video traffic of 3G-TS circuit domain (as the visual telephone service of point-to-point dial mode) not need operator's platform support; Adopt the video traffic of 3G-PS packet domain (as the video conferencing business of point-to-multipoint mode) to need operator's platform support.

Claims

1. vehicle-mounted DTU plate, it is characterized in that: described DTU plate comprises CPU, WCDMA 3G module, SIM card and power-supply system, CPU is connected with WCDMA 3G module, WCDMA 3G module is connected with SIM card, also comprise with gps system and carry out interacting message, realize the interface control circuit of the message transmission of voice service and control information, described interface control circuit comprises UART interface, USB interface and Audio audio interface, described interface control circuit is connected on the WCDMA 3G module, and power-supply system provides electric power for WCDMA 3G module and interface control circuit.

2. a kind of vehicle-mounted DTU plate according to claim 1, it is characterized in that: described Audio audio interface provides the audio frequency input/output signal, realizes the speech channel between DTU plate and the gps system.

3. a kind of vehicle-mounted DTU plate according to claim 1 is characterized in that: described CPU adopts ARM7.

4. a kind of vehicle-mounted DTU plate according to claim 1 is characterized in that: described WCDMA 3G module adopts MU103/203 module or MU723 high-speed data module.

5. a kind of vehicle-mounted DTU plate according to claim 1, it is characterized in that: the direct paster of described SIM card is to the PCB circuit board.