CN201278555Y

CN201278555Y - Mobile terminal with CAN bus monitoring node

Info

Publication number: CN201278555Y
Application number: CNU2008201340674U
Authority: CN
Inventors: 石焱
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2008-09-12
Filing date: 2008-09-12
Publication date: 2009-07-22
Anticipated expiration: 2018-09-12

Abstract

The utility model discloses a mobile terminal with CAN bus monitoring nodes, comprising a mobile terminal module and a CAN bus module. The CAN bus module comprises a CAN bus interface, a CAN transceiver and a CAN controller, wherein one end of the CAN bus interface is connected with the CAN transceiver, and the other end is connected to a CAN bus on a CAN bus network; the CAN transceiver is connected with the CAN controller and is used for receiving and dispatching signals on the CAN bus; and the CAN controller is used for processing a CAN protocol and communicating with a digital baseband of the mobile terminal module. The utility model accesses the mobile terminal into the CAN bus network through the CAN bus interface of the mobile terminal so as to realize the information interaction between the mobile terminal and the network of automobiles, and the like and utilize the mobile terminal to analyze and monitor the nodes in the network.

Description

Portable terminal with CAN monitoring bus node

Technical field

The utility model relates to communication technical field, relates in particular to a kind of portable terminal of the CAN of having monitoring bus node.

Background technology

Traditional car data transmission form is that every information all needs an independently data wire, such as engine speed, fuel consumption and throttle position information, carries out data passes with regard to 3 data wires of needs between control unit.Along with automotive control system becomes increasingly complex, required information transmitted amount is also increasing, so the pin number of the quantity of data wire and control unit also can correspondingly increase, so this data passes form only is applicable to exchanges data and transmission between limited information.

Along with the fast development of automotive electronics and mechanics of communication, the application of network system bus on automotive electronics more and more widely.Controller local area network (Cotroller Area Network abbreviates CAN as) is a kind of multistation information transmission system of Hyundai Motor, is proposed at first by German Bosch company, is one of most widely used fieldbus in the world at present.

When adopting the CAN bus network, all information between each control unit all only need transmit by two bidirectional data lines, no matter the size of what and information capacity of control unit can be transmitted by the CAN bus.In this way, each control unit has been connected to form a complete system.

The CAN bus is a kind of serial communication bus of many master modes, and basic design specification requires to have higher bit rate, anti-electromagnetic interference, and wants to detect any mistake of bus.When signal transmission distance reached 10km, CAN still can provide the message transmission rate up to 50kbps, and it has very superior characteristics:

(1) lower cost and high total line use ratio;

(2) data transmission distance is 10km, and transmission rate can be up to 1Mbps;

(3) reliable fault processing and error-detection mechanism can be retransmitted after the information of transmission is destroyed automatically;

(4) node has the function that withdraws from bus automatically under wrong serious situation;

(5) message does not comprise source address or destination address, only comes deixis information and precedence information with identifier.

Present CAN bus network analysis and monitoring and detection need be used special-purpose CAN protocol analyzer or automobile logic analyzer.

Chinese invention patent application CN200610026880.5 discloses a kind of such equipment---and kind is based on CANBUS information gathering, issue and the car-mounted terminal of controlling, it makes up the vehicle LAN by main control unit CAN mouth, utilize GPRS or CDMA module, be connected with main control unit by the RS232 mouth, in built-in Linux operating system, by PPP Dial-up Network agreement, car-mounted terminal is interconnected by cordless communication network and Internet, realize the device that information gathering, issue combine with the hardware and software of control.

These instrument price general charged costlinesses need the external power adapter power supply, and need link to each other with computer, move corresponding software and could analyze, thereby a kind of low cost solution to be supplied is arranged.

The utility model content

The purpose of this utility model is to provide a kind of portable terminal of CAN monitoring bus node, in order to solve the high problem of cost that car-mounted terminal of the prior art inserts CAN.

For reaching this purpose, portable terminal with CAN monitoring bus node of the present utility model, comprise mobile terminal module and CAN bus module, the CAN bus module comprises CAN bus interface, CAN transceiver and CAN controller, wherein, CAN bus interface one end and CAN transceiver join, the other end provides interface to be connected to CAN bus on the CAN bus network; The CAN transceiver links to each other with the CAN controller, is used for the transmitting-receiving of signal on the CAN bus; The CAN controller be used for the CAN agreement processing and with the digital baseband chip communication of mobile terminal module.

Preferably, above-mentioned CAN transceiver adopts the TJA1054 chip.

Preferably, above-mentioned CAN controller adopts the SJA1000 chip.

Preferably, above-mentioned mobile terminal module is the mobile terminal module of GSM standard or WCDMA standard.

Preferably, above-mentioned CAN bus network is the automobile CAN-bus network

Adopt technique scheme of the present utility model, CAN bus interface by portable terminal is linked into portable terminal in the CAN bus network of automobile, realize the information interaction of CAN bus network such as portable terminal and automobile, and utilize portable terminal that the node in the network is analyzed and monitored.Thereby can make portable terminal have the new function that inserts and read and monitor CAN bus network information such as automobile with lower cost.

Be noted that the description and the following detailed description all are exemplary, being intended to provides further instruction to desired the utility model.

Except purpose described above, feature and advantage, the utility model also has other purpose, feature and advantage.Below with reference to figure, other purpose, feature and effect of the present utility model is described in further detail.

Description of drawings

Constitute this specification a part, be used for further understanding and of the present utility modelly illustrate preferred embodiment and be used for illustrating principle of the present utility model with explanation.Among the figure:

Fig. 1 is the structured flowchart according to the portable terminal of the CAN of having monitoring bus node of the present utility model;

Fig. 2 is the schematic diagram of CAN bus module in the portable terminal shown in Figure 1;

Fig. 3 is the software processes flow chart of CAN bus module.

Embodiment

Be described in detail below in conjunction with accompanying drawing and preferred embodiment portable terminal the CAN of having monitoring bus node of the present utility model.

Fig. 1 is the structured flowchart according to the portable terminal of the CAN of having monitoring bus node of the present utility model.As shown in Figure 1, the utility model is to have added the CAN bus module in common mobile terminal module, and this CAN bus module comprises CAN controller 2, CAN transceiver 3 and CAN bus interface 4.

Wherein, the CAN bus transceiver of CAN bus interface 4 one ends and portable terminal inside joins, and the other end provides interface to be connected to CAN bus on the automobile.By this CAN bus interface, the coffret of the CAN bus twisted-pair feeder 6 on portable terminal and the automobile is linked to each other, portable terminal can be linked in the CAN bus network of automobile.CAN transceiver 3 is used for the transmitting-receiving of signal on the CAN bus, and it is the interface between CAN controller and the CAN physical bus, and differential transmission and receiving ability is provided.CAN controller 2 is independent CAN protocol processors, is responsible for the information on the CAN bus is received, sends buffering, checks and accepts filtering etc., it with the digital baseband chip 1 of portable terminal terminal between employing GPIO mouth be connected, carry out communication.

Preferably, the CAN controller can adopt the SJA1000 chip of Philips company, and its compatible CAN2.0B agreement is supported 11 and 29 s' identifier, and maximum transfer rate can reach 1Mbits/s.Transceiver adopts the TJA1054 chip of Philips company, has good Electro Magnetic Compatibility and bus failure management function.Mobile terminal module is the mobile terminal module GSM standard or the GSM/WCDMA standard.

Fig. 2 is the schematic diagram of CAN bus module in the portable terminal shown in Figure 1.Digital baseband chip is the digital baseband signal process chip in GSM or the WCDMA mobile terminal module, and it is configured the parameter of CAN controller, reads the data that obtain through examination filtering and transfer data to the CAN controller also to start tasks such as transmission.The effect of CAN controller, CAN transceiver, CAN bus interface please refer to above-mentioned explanation.

Fig. 3 is the software processes flow chart of CAN bus module.As shown in Figure 3, this handling process may further comprise the steps: S10) beginning, mobile terminal-opening; S12) the GPIO mouth of configuration digital baseband chip, the communication of foundation and CAN controller is set up task CAN_init_task, initialization CAN module; S14) CAN controller register configuration is provided with and checks and accepts filter mask off code and receiving flag symbol; Does S16) detecting outside CAN bus connect? as connecting, duplicate detection then is if on connecting, then carry out next step S18; Does S18) detection receive data? if do not receive data, execution in step S22 then, as receive data, then execution in step S20.

S20) after the filtering of reception data acceptance, read the reception buffer data, report receiving flag afterwards, and remove the reception buffering area; S22) whether send monitor message,, then return step S18,, then carry out next step S24 if select to send if select not send; S24) be provided with and send the blip symbol, will send data and be filled into the transmission buffering area, start and send, report afterwards to send sign, clear to send buffering area and return step S18 subsequently, so, the circulation execution.

The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.

Claims

1. the portable terminal with CAN monitoring bus node is characterized in that, comprises mobile terminal module and CAN bus module, and described CAN bus module comprises CAN bus interface, CAN transceiver and CAN controller, wherein,

Described CAN bus interface one end and described CAN transceiver join, the other end provides interface to be connected to CAN bus on the CAN bus network;

Described CAN transceiver links to each other with described CAN controller, is used for the transmitting-receiving of signal on the CAN bus;

Described CAN controller be used for the CAN agreement processing and with the digital baseband chip communication of described mobile terminal module.

2. the portable terminal with CAN monitoring bus node according to claim 1 is characterized in that, described CAN transceiver adopts the TJA1054 chip.

3. the portable terminal with CAN monitoring bus node according to claim 1 and 2 is characterized in that, described CAN controller adopts the SJA1000 chip.

4. the portable terminal with CAN monitoring bus node according to claim 1 is characterized in that, described mobile terminal module is the mobile terminal module of GSM standard or WCDMA standard.

5. the portable terminal with CAN monitoring bus node according to claim 1 is characterized in that, described CAN bus network is the automobile CAN-bus network.