CN201926924U

CN201926924U - Remote vehicle-mounted diagnosis and positioning system based on CAN bus and K-line

Info

Publication number: CN201926924U
Application number: CN2011200010128U
Authority: CN
Inventors: 陈昭胜; 张代祥; 柯贤亮
Original assignee: Fujian Star Net Communication Co Ltd
Current assignee: Fujian Star Net Communication Co Ltd
Priority date: 2011-01-04
Filing date: 2011-01-04
Publication date: 2011-08-10
Anticipated expiration: 2021-01-04

Abstract

The utility model provides a remote vehicle-mounted diagnosis and positioning system based on a CAN (controller area network) bus and a K-line, which includes a vehicle-mounted monitoring terminal unit and a background monitoring unit. The vehicle-mounted monitoring terminal unit comprises a processor with an ARM (advanced RISC machines) chip, a power management module, a watchdog circuit, a synchronous dynamic random access memory, a FLASH memory, a signal detection module, a CAN bus module, a K-Line module, a RS232 (recommend standard 232) bus module, a GPS (global position system) positioning module, a remote data transmission module and a SIM (subscriber identity module) card module. The background monitoring unit comprises a monitoring center and a monitoring work station and is communicated with the vehicle-mounted monitoring terminal unit through a wireless network. The remote vehicle-mounted diagnosis and positioning system transmits data signals of the CAN bus or the K-line of the vehicle-mounted monitoring terminal unit to the monitoring work station, thereby achieving the diagnosis of vehicle-mounted status in the remote workstation.

Description

Long-distance vehicular diagnosis positioning system based on CAN bus and K line

[technical field]

The utility model relates to a kind of onboard diagnostic system, and this system has CAN bus and K line interface, has the GPS positioning function, and can long-range transceive data.

[background technology]

Onboard diagnostic system is in order to obtain vehicle condition information, and its processor need communicate with control element on the car.CAN bus and K line all are the communication bus standards of auto industry, all have a wide range of applications in many occasions, in order to communicate by letter with the control element on these cars, diagnostic device must have CAN bus and K line interface, and traditional On-Board Diagnostics (OBD) device can only be reported to the police to the faults itself of car, the tail gas of discharging when engine exceeds standard or breaks down, and system can send warning at once, lights the inspection engine emergency warning lamp on the instrument.Simultaneity factor can be automatically with relevant diagnostic trouble code or data storage in the middle of the storer of engine computer, maintenance personal or supervisory personnel can read diagnostic trouble code by the Computerized tester of special use in engine computer, diagnostic trouble code can directly reflect trouble spot or the reason that breaks down.But this device can not carry out long-range monitoring to be diagnosed, and can not the position of automobile be positioned, so just can not be timely to the diagnosing malfunction maintenance of vehicle.

[utility model content]

The technical problems to be solved in the utility model is to provide a kind of based on CAN bus and K line, has the long-distance vehicular diagnosis positioning system of GPS location and long-range transceive data function simultaneously.

The utility model is a kind of long-distance vehicular diagnosis positioning system based on CAN bus and K line, comprises vehicle monitor terminal unit and background monitoring unit;

Described vehicle monitor terminal unit comprises processor, power management module, watchdog circuit, Synchronous Dynamic Random Access Memory, FLASH storer, signal detection module, CAN bus module, K wire module, RS232 bus module, GPS locating module, remote data transmission module and the SIM card module that has the ARM chip; Described processor is connected with described power management module, Synchronous Dynamic Random Access Memory, FLASH storer, watchdog circuit, CAN bus module, K wire module, RS232 bus module, GPS locating module, signal detection module and remote data transmission module respectively; Described remote data transmission module links to each other with the SIM card module;

Described background monitoring unit comprises Surveillance center and monitor workstation; Described Surveillance center communicates by letter with described monitor workstation through wireless network or LAN (Local Area Network).

Usefulness of the present utility model is: the utility model is connected with relevant interface in the car with the K line interface by the CAN bus, can obtain the corresponding status information of vehicle in real time, the status information that bus and K line interface are obtained is passed to supervisory system by wireless network, supervisory system utilizes its powerful hardware handles platform to finish mass data statement analysis and arrangement,, in face of the terminal user, be implemented in remote work station and diagnose vehicle-mounted state with the chart interface display of straightforward.

[description of drawings]

Fig. 1 is a system chart of the present utility model;

The power management module circuit theory diagrams of Fig. 2 vehicle monitor terminal unit;

The storage expanding module circuit theory diagrams of Fig. 3 vehicle monitor terminal unit;

The watchdog circuit schematic diagram of Fig. 4 vehicle monitor terminal unit;

The CAN bus module circuit theory diagrams of Fig. 5 vehicle monitor terminal unit;

The K wire module circuit theory diagrams of Fig. 6 vehicle monitor terminal unit;

The RS232 modular circuit schematic diagram of Fig. 7 vehicle monitor terminal unit;

The GPS modular circuit schematic diagram of Fig. 8 vehicle monitor terminal unit;

The remote data transmission module of Fig. 9 vehicle monitor terminal unit and SIM card module principle figure;

The signal detection module schematic diagram of Figure 10 vehicle monitor terminal unit.

[embodiment]

Referring to figs. 1 through shown in Figure 10, a kind of long-distance vehicular diagnosis positioning system based on CAN bus and K line comprises vehicle monitor terminal unit 1 and background monitoring unit 2;

Described vehicle monitor terminal unit comprises processor 100, power management module 101, watchdog circuit 102, Synchronous Dynamic Random Access Memory 103, FLASH storer 104, signal detection module 105, CAN bus module 106, K wire module 107, RS232 bus module 108, GPS locating module 109, remote data transmission module 110 and the SIM card module 111 that has the ARM chip;

Described processor 100 is connected with described power management module 101, Synchronous Dynamic Random Access Memory 103, FLASH storer 104, watchdog circuit 102, CAN bus module 106, K wire module 107, RS232 bus module 108, GPS locating module 109, signal detection module 105 and remote data transmission module 110 respectively; Described remote data transmission module 110 links to each other with SIM card module 111;

Described background monitoring unit comprises Surveillance center 21 and monitor workstation 22;

Described Surveillance center 21 communicates by letter with described monitor workstation 22 through wireless network or LAN (Local Area Network).

Wherein said background monitoring unit 1 communicates by wireless network and described vehicle monitor terminal unit 2; Described wireless network is a kind of of GSM, GPRS, CDMA, 3G.

Wherein said processor 100 is connected with CAN bus module 106 by the CAN interface, and described processor 100 all is connected by serial ports with K wire module 107, RS232 bus module 108, GPS locating module 109, remote data transmission module 110.

Wherein said CAN bus 106 modules comprise CAN transceiving chip 1061, CAN holding circuit (not shown); Described K wire module 107 comprises K line transceiving chip 1071, K line holding circuit (not shown).

Wherein said power management module 101 comprises power protecting circuit (not shown), DC-DC converter (not shown) and the LDO conversion chip (not shown) that is used for carrying to each module different voltages.

Wherein said GPS locating module 109 comprises GPS chip 1091, antenna plug testing circuit 1092.

The principle of work of this system is: processor 100 obtains the GPS locator data by serial ports and 109 communications of GPS module; By serial ports and 108 communications of RS232 bus module, obtain automobile RS232 bus data; By serial ports and 107 communications of K wire module, obtain automobile K line data; By CAN interface and 106 communications of CAN bus module, obtain the automobile CAN-bus data; By I/O interface and signal detection module 105 communications, obtain antenna detection, ACC, manual alerting signal.Processor 100 is analyzed these data, arrangement, be packaged into the message of specific format according to certain agreement, by serial ports and 110 communications of remote data transmission module, remote data transmission module 110 is passed to supervisory system 2 by wireless network again, supervisory system utilizes its powerful hardware handles platform to finish mass data statement analysis and arrangement,, is implemented in remote work station and diagnoses vehicle-mounted state in face of the terminal user with the chart interface display of straightforward.

As shown in Figure 2, in power management module, import as power supply with 12V or 24V automobile power source, the step-down chip model of selected DC-DC converter is MP2467, output 5V DC voltage; Selected LDO (LOW DROP-OUT, linear voltage regulator) conversion chip model is respectively LM1086-ADJ, output 4V DC voltage; TPS79333, output 3.3V DC voltage; TPS79333, output 3.3V DC voltage.The effect of power management module is that automobile power source is carried out filtering, and rectification also changes into each module that various DC voltage are supplied with the car-mounted terminal unit.

As shown in Figure 3, Synchronous Dynamic Random Access Memory (SDRAM) and FLASH storer are the storage expansion of controller, store various control informations; Wherein, SDRAM is connected with described processor by a d type flip flop, and the FLASH storer is by MISO, and MOSI is connected with the corresponding pin of described processor with SCK.

As shown in Figure 4, MAX706S is one group of CMOS supervisory circuit, can monitoring power voltage, the duty of battery failures and microprocessor or microcontroller, and the WatchDog Timer function is provided.The MR of the utility model MAX706S self is connected with WDO, and WDI is connected with PFO, and links to each other with described processor with the RST signal wire by PFI.

As Fig. 5, adopt the interface of SN65HVD23X family chip as CAN transceiving chip and physical bus, can provide differential transmission and receiving function to the CAN transceiving chip.The SN65HVD23X chip links to each other with CANRX with the CAN interface CANTX that RX signal wire and processor carry by TX.The SN65HVD23X chip links to each other with the automobile CAN-bus interface with the CANL signal wire by CANH; and on CANH and CANL signal wire, add choking coil; the TVS pipe; holding circuit such as gas-discharge tube and fuse so just can prevent effectively that high pressure or the big electric current on vehicle-mounted from entering terminal system by the CAN network.

As Fig. 6, adopt the interface of L9637 chip as K line transceiving chip, can provide K line transceiving chip to send and receiving function.The L9637 chip links to each other with RX3 with the TX3 of RX signal wire with the serial ports 3 of described processor by TX.On automobile K line interface, add TVS pipe, can prevent effectively that the high pressure on vehicle-mounted from entering terminal system.

As Fig. 7, the RE232 module adopts the SP3222ECA chip, and this chip can be changed Transistor-Transistor Logic level and RS232 level.The SP3222ECA chip links to each other with RX1 with the TX1 of R1OUT signal wire with the serial ports 1 of described processor by T1IN.The SP3222ECA chip links to each other with automobile RS232 bus interface with the R1IN signal wire by T1OUT.

As Fig. 8, the utility model adopts GS-92M as the GPS locating module, receives the GPS message of HA Global Positioning Satellite by antenna.GS-92M links to each other with RX5 with the TX5 of the serial ports 5 of described processor with RXA by TXA.According to the antenna impedance characteristic, when antenna inserted, antenna impedance (Rload) was 50 ohm; When disconnecting, impedance is infinitely great; Utilize this characteristic, design an antenna plug testing circuit, link to each other with described processor IO mouth by signal wire.

As Fig. 9, the utlity model has the remote data transmission function, adopt EM200/EM310 as the remote data transmission module, carry out radio communication by antenna and SIM card and Surveillance center, Surveillance center is put in the data of receiving among the internet Internet, and monitor workstation is logined Internet and obtained data.The remote data transmission module links to each other with RX2 with the TX2 of the serial ports 2 of controller with/RXD by/TXD.The remote data transmission module is passed through SIMVCC, SIMCLK, and SIMDATA links to each other with SIM card with SIMRST.Chip DALC208 has IO mouth electrostatic protection function, and this chip is by IO1, and IO2 links to each other with SIM card with IO3.

As Figure 10, adopt level height testing circuit to detect antenna plug signal, manual alerting signal, ACC start signal etc., detected level signal is connected with described processor by the I/O mouth.

The above only is preferred embodiment of the present utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.

Claims

1. the long-distance vehicular diagnosis positioning system based on CAN bus and K line is characterized in that: comprise vehicle monitor terminal unit and background monitoring unit;

2. the long-distance vehicular diagnosis positioning system based on CAN bus and K line according to claim 1, it is characterized in that: described background monitoring unit communicates by wireless network and described vehicle monitor terminal unit.

3. the long-distance vehicular diagnosis positioning system based on CAN bus and K line according to claim 1 and 2, it is characterized in that: described wireless network is a kind of of GSM, GPRS, CDMA, 3G.

4. the long-distance vehicular diagnosis positioning system based on CAN bus and K line according to claim 1, it is characterized in that: described processor is connected with the CAN bus module by the CAN interface, and described processor all is connected by serial ports with K wire module, RS232 bus module, GPS locating module, remote data transmission module.

5. the long-distance vehicular diagnosis positioning system based on CAN bus and K line according to claim 1, it is characterized in that: described CAN bus module comprises CAN transceiving chip, CAN holding circuit; Described K wire module comprises K line transceiving chip, K line holding circuit.

6. the long-distance vehicular diagnosis positioning system based on CAN bus and K line according to claim 1, it is characterized in that: described power management module comprises power protecting circuit, DC-DC converter and the LDO conversion chip that is used for carrying to each module different voltages.

7. the long-distance vehicular diagnosis positioning system based on CAN bus and K line according to claim 1, it is characterized in that: described GPS locating module comprises GPS chip, antenna plug testing circuit.