CN201788409U

CN201788409U - Automobile safety information system based on CAN bus

Info

Publication number: CN201788409U
Application number: CN2010205422083U
Authority: CN
Inventors: 胡涛; 李香迪
Original assignee: Xian University of Technology
Current assignee: Xian University of Technology
Priority date: 2010-09-26
Filing date: 2010-09-26
Publication date: 2011-04-06
Anticipated expiration: 2020-09-26

Abstract

The utility model discloses an automobile safety information system based on a CAN (Control Area Network) bus, which comprises a vehicle mounted terminal part and a monitoring center part. The vehicle mounted terminal part comprises a CAN bus which comprises two or more CAN nodes respectively connected with a GPS (global positioning system) receiving module, an ultrasonic ranging module and a USB read-write module; the USB read-write module is connected with a USB flash disk; the two or more CAN nodes are connected with a GPRS module a through a level conversion chip a; the two or more CAN nodes are connected with a DSP (digital signal processing) module a through a level conversion chip b; a camera, a LCD and a microphone are respectively connected with the DSP module; the monitoring center part comprises a PC (Personal Computer) and a GPRS module b; and the GPRS module b is in wireless communication with the GPRS module a through a GPRS network. The automobile safety information system based on the CAN bus can effectively implement safe driving of drivers and monitor automobiles.

Description

A kind of automotive safety infosystem based on the CAN bus

Technical field

The utility model belongs to the vehicle safety technical field, is specifically related to a kind of automotive safety infosystem based on the CAN bus.

Background technology

For reducing casualties and the damage to property that motor traffic accidents causes, people utilize the whole bag of tricks and measure to reduce the generation of traffic hazard.At present, the research of automobile safety system and achievement mainly concentrate in the safety equipment configuration of vehicle self, as safety features such as anti-lock braking system, intact stability control, securing band, air bags, and because the potential safety hazard that driver artificial origin (as long-duration driving, fatigue driving etc.) causes is not taked effective safe precaution measure as yet.In addition, present most of automotive safety functions of the equipments are comparatively single, not with vehicle body status, driver status, vehicle and driver's effective monitoring ground combination, can not carry out comprehensively automotive safety information, real-time exchange, thereby can not solve this systemic problem of ride safety of automobile well.

Summary of the invention

The purpose of this utility model provides a kind of automotive safety infosystem based on the CAN bus, and it is comparatively single to have solved existing automobile safety system function, can not carry out comprehensively automotive safety information, the problem of real-time exchange.

The technical scheme that the utility model adopted is, a kind of automotive safety infosystem based on the CAN bus, comprise car-mounted terminal part and Surveillance center's part, car-mounted terminal partly comprises the CAN bus that is made of two or more CAN nodes, in the CAN node two or more are connected with GPS receiver module, ultrasonic distance measuring module, USB module for reading and writing respectively, also are connected with USB flash disk on the USB module for reading and writing; In the CAN node two or more also are connected with GPRS module a by level transferring chip a; In the CAN node two or more also are connected with the DSP module by level transferring chip b, also are connected with camera, LCD and loudspeaker on the DSP module respectively; Surveillance center partly comprises PC and the GPRS module b that is connected, and GPRS module b and GPRS module a carry out radio communication by GPRS network.

Characteristics of the present utility model also are, car-mounted terminal CAN node wherein is formed by connecting by 32 the ARM microprocessors and the CAN integrated transceiver of band CAN controller.

DSP module wherein is core processor with TMS320DM642.

The beneficial effects of the utility model are, integrate driver identification, fatigue driving detection and early warning, bus location, preventing collision of vehicles hit, vehicle anti-theft, driving recording and long distance wireless vehicle information management, the embedded onboard terminal is used the CAN bussing technique, being easy to increases assisting and expanded function of other in CAN bus node mode, and can with existing automobile bus seamless link, share internal data, thereby realize that effectively driver safety is driven and the vehicle supervision.

Description of drawings

Fig. 1 is the automotive safety structure of information system synoptic diagram of the utility model based on the CAN bus;

Fig. 2 be in the utility model the CAN node structure and with CAN bus connection diagram;

Fig. 3 is a DSP module connection diagram in the utility model;

Fig. 4 is the structural representation of ultrasonic distance measuring module in the utility model.

Among the figure, 1.CAN node, 2.GPS receiver module, 3. ultrasonic distance measuring module, 4. level transferring chip a, 5.GPRS module a, 6. level transferring chip b, 7.DSP module, 8. camera, 9.LCD, 10. loudspeaker, 11.USB module for reading and writing, 12. USB flash disk, 13.PC machine, 14.GPRS module b, 15.GPRS network, 32 ARM microprocessors of 16. band CAN controllers, 17.CAN integrated transceiver.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is elaborated.

The utility model is based on the structure of a kind of embodiment of automotive safety infosystem of CAN bus, as shown in Figure 1, comprise car-mounted terminal part and Surveillance center's part, car-mounted terminal partly comprises the CAN bus that is made of a plurality of CAN nodes 1, be connected with GPS receiver module 2 respectively on a plurality of CAN nodes 1 wherein several, ultrasonic distance measuring module 3, USB module for reading and writing 11, also be connected with USB flash disk 12 on the USB module for reading and writing 11, the wherein several of a plurality of CAN nodes 1 also are connected with GPRS module a5 by level transferring chip a4, the wherein several of a plurality of CAN nodes 1 also are connected with DSP module 7 by level transferring chip b6, also are connected with camera 8 on the DSP module 7 respectively, LCD9 and loudspeaker 10; Surveillance center partly comprises PC 13 and the GPRS module b14 that is connected, and GPRS module b14 and GPRS module a5 carry out radio communication by GPRS network 15.

The course of work of the present utility model is: car-mounted terminal partly is installed in the automobile, and Surveillance center partly is positioned at the pulpit.The antenna of the GPS receiver module 2 of car-mounted terminal part places not have on the automobile and blocks the position, such as roof.The probe of ultrasonic distance measuring module 3 is installed in the vehicle body outside, before car, and Che Hou etc.Camera 8 is adjusted to suitable position makes it can gather driver's entire face.Insert the SIM card of opening gprs service among the GPRS module b14 of the GPRS module a5 of car-mounted terminal part and Surveillance center's part.

GPS receiver module 2 obtains the GPS information of vehicle; Ultrasonic distance measuring module 3 measuring vehicle peripheral obstacle distances; Camera 8 is gathered driver's video image, be solidificated in the software algorithm identification of driver in the DSP module 7 and detect its fatigue state and phonetic warning, LCD9 echo video image, driver drive time span, fatigue state and other relevant information, as vehicle GPS information, obstacle distance etc.; The CAN node 1 that has USB module for reading and writing 11 is with vehicle GPS information, driver's image, and Various types of data such as running time and fatigue state regularly write USB storage; The CAN node 1 that has GPRS module a5 is uploaded vehicle GPS information, driver image, running time and fatigue state etc. by GPRS network 15 to Surveillance center according to Surveillance center's order or timing.In addition, GPRS module a5 also can receive the order of car owner's SMS, returns vehicle position information in real time, prevents that vehicle is stolen.

GPS receiver module 2 and ultrasonic distance measuring module 3 all directly link to each other by UART0 on Transistor-Transistor Logic level serial port and the CAN node 1.USB module for reading and writing 11 serial ports link to each other with UART1 on the CAN node 1, and the USB interface of USB module for reading and writing 11 is connected with USB flash disk 12 or other USB storage.The serial ports of DSP module 7 and GPRS module a5 is the RS232 level, needs by linking to each other with UART0 on the CAN node 1 after the level conversion.

Surveillance center can send traffic information and related command by GPRS to vehicle at any time, receives driver's image and fatigue state, information of vehicles, in real time monitoring vehicle and driver.In addition, PC 13 also is used for resolving the data of car-mounted terminal USB storage.

As shown in Figure 2, car-mounted terminal CAN node 1 is formed by connecting by 32 the ARM microprocessors 16 and the CAN integrated transceiver 17 of band CAN controller.The CANTD of ARM, CANRD mouth link to each other with CRXD, the CTXD mouth of CTM1050T respectively, and CAN integrated transceiver 17 adopts CTM1050T, and its CANH, CANL mouth are connected with the low level line with the high level line of bus respectively, constitute the bus node circuit.CAN bus communication medium is a twisted-pair feeder, and terminal bus connects the resistance of two 120 Ω, is used for the bus impedance coupling.

The port of DSP module 7 connects in the utility model, and as shown in Figure 3, car-mounted terminal DSP module 7 is a core processor with TMS320DM642.Serial ports on the DSP module 7 is by linking to each other with UART0 on the CAN node 1 after the level conversion.The TMS320DM642 core processor comprises: 1) three configurable video port VP0, VP1, VP2, the seamless interfacing with video input and output demoder, scrambler can be provided, and video input interface connects camera, and video output connects LCD display.2) multiple channel audio interface McASP links to each other with the digital audio interface of DAB codec, the analogue audio frequency output interface of codec connects loudspeaker, after digital audio-frequency data is changed by codec D/A, export through the analogue audio frequency delivery outlet, on loudspeaker, play, realize phonetic warning in the car.3) 64 external memory interface EMIF, can with multiple storer such as the seamless binding of flash memory FLASH, the needed driver's identification software of processor code is solidificated among the flash memory FLASH by the JTAG programming.4) general input GPIO provides general purpose I/O to support, is used to connect the function keyboard of man-machine interaction.5) meet the JTAG(Joint Test Action Group of IEEE1149 standard) the standard testing interface, can debug to the DSP loading procedure with to program by the DSP emulator.

The structure of the utility model ultrasonic distance measuring module 3, as shown in Figure 4, the serial ports on the ultrasonic distance measuring module 3 links to each other with UART0 on the CAN node 1.Ultrasonic distance measuring module 3 comprises microprocessor and a plurality of range finding probe, and the range finding probe is used to transmit and receive ultrasonic signal, and microprocessor calculates vehicle and obstacle distance.The range finding probe comprises that ultrasonic signal emission and signal receive two parts, and the ultrasonic signal radiating portion is made of radiating circuit and transmitting probe, and the radiating circuit input interface links to each other with microprocessor GPIO mouth, and output interface connects the ultrasonic emitting probe.The ultrasonic signal receiving unit is made of receiving circuit and receiving transducer, and the receiving circuit output interface links to each other with microprocessor GPIO mouth, and input interface connects the ultrasound wave receiving transducer.

In the present embodiment, CAN node 1, GPS receiver module 2, DSP module 7, USB module for reading and writing 11, ultrasonic distance measuring module 3 are+the 5V operating voltage, LCD9 and GPRS module a5, GPRS module b14 needs+12V operating voltage.Adopt universal power adapter, the 220V alternating current is converted to the direct current of 12V, be directly used in the car-mounted terminal power supply.Car-mounted terminal adopts a DC/DC dc conversion modules, and general+12V operating voltage is converted to+the 5V operating voltage, and with behind the capacitor filtering, right respectively+12V rated voltage device and+5V rated voltage device powers.

Claims

1. automotive safety infosystem based on the CAN bus, it is characterized in that, comprise car-mounted terminal part and Surveillance center's part, car-mounted terminal partly comprises the CAN bus that is made of two or more CAN nodes (1), in the CAN node (1) two or more are connected with GPS receiver module (2), ultrasonic distance measuring module (3), USB module for reading and writing (11) respectively, also are connected with USB flash disk (12) on the USB module for reading and writing (11); In the CAN node (1) two or more are also by level transferring chip a(4) with GPRS module a(5) be connected; In the CAN node (1) two or more are also by level transferring chip b(6) be connected with DSP module (7), also be connected with camera (8), LCD(9 on the DSP module (7) respectively) and loudspeaker (10); Described Surveillance center partly comprises PC (13) and the GPRS module b(14 that is connected), GPRS module b(14) and GPRS module a(5) carry out radio communication by GPRS network (15).

2. the automotive safety infosystem based on the CAN bus according to claim 1 is characterized in that, described car-mounted terminal CAN node (1) is formed by connecting by 32 the ARM microprocessors (16) and the CAN integrated transceiver (17) of band CAN controller.

3. the automotive safety infosystem based on the CAN bus according to claim 1 is characterized in that, described DSP module (7) is core processor with TMS320DM642.