CN201268289Y - Vehicle mounted estimation navigation and multimedia platform system based on controller local area network bus - Google Patents
Vehicle mounted estimation navigation and multimedia platform system based on controller local area network bus Download PDFInfo
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Abstract
The utility model relates to a vehicular calculating navigation and multimedia platform system based on a controller LAN bus, which comprises a navigation/multimedia main control module and a GPS functional module, wherein the navigation/multimedia main control module comprises a power supply management unit, a GPS data processing unit and a navigation and calculating navigation algorithm unit, the power supply management unit is connected with other units, and the navigation and calculating navigation algorithm unit is connected with the GPS functional module by the GPS data processing unit. The vehicular calculating navigation and multimedia platform system based on a controller LAN bus realizes more accurate calculating navigation and multifunctional multimedia play control function, can simultaneously utilize a CAN-BUS bus to perform real time monitoring for various sensors and electronic equipment inside the automobile, has simple and practical structure, rapid and convenient operation, stable and reliable working capability and wider applicable range, and establishes a firm foundation for the further development of modern automobile electronic equipment.
Description
Technical field
The utility model relates to vehicle electric field, and particularly vehicle mounted guidance and multimedia device technical field specifically are meant a kind of vehicle-mounted reckoning navigation and multimedia platform system based on Controller Area Network BUS (CAN-BUS).
Background technology
The vehicle-mounted control technology is mainly still based on single-chip computer control system at present, various functional modules are independent mutually, operate loaded down with trivial details, cannot realize resource sharing, information sharing, the extendability extreme difference, make the development of the multifunction that vehicle electronics product can't go with the tide of historical development, can not satisfy the demand of people far away vehicle-mounted audiovisual, amusement and automobile-used information.The auto trade develop rapidly is also had higher requirement to vehicle electronics product.
Traditional GPS and DR (reckoning) integrated navigation system, be to adopt the analog rate impulse singla that provides on the automobile as the speed of calculating, angle-data then comes from the angular velocity sensor (gyro) that is installed in device interior, when the GPS receiver can't be received satellite-signal, the relative variation that position fixing system then relies on the variation of the variation of automobile cireular frequency and distance to calculate vehicle location, and the variation of its position changed into latitude and longitude coordinates output.
The defective that this system exists is: because the cost reason, vehicle-mounted angular velocity sensor is piezoelectric type gyro or micromechanical gyro cheaply mostly, the intrinsic weakness of this kind gyro is that sensitivity is low, when the automobile turning radius is very big, gyro can't provide the variable quantity of cireular frequency, thereby the positional error that causes system to be calculated strengthens; Secondly, when the cumulative errors of gyro can cause using for a long time, its intrinsic cumulative errors can cause positional error along with the variation of time is increasing, therefore, in the existing integrated navigation system, adopt the regular data of longitude and latitude of GPS output to calibrate, exactly in order to offset the accumulated error of gyro to gyro; The 3rd, it is bigger that the precision of gyro is influenced by variation of temperature, and in the onboard combined navigation locating module, mostly design has temperature sensor measuring the temperature traverse around the gyro, and according to the data of temperature traverse correction gyro output; The 4th, gyro needs horizontal positioned installing, and after the level inclination of gyro surpassed certain angle, the gyro output accuracy also can be subjected to certain influence.
And the BCM of automobile (vehicle body computer module, Body Computer Module) and ICM (device array module, Instrument Cluster Module) can receive relevant automobile sensor signal, wherein, tacho-pulse from automobile back wheel provides a left side, the tacho-pulse data of off hind wheel; When automobile was being turned, the rotating speed of inboard wheel was different with the rotating speed of outside wheel, utilized the difference of this speed just can calculate the variable quantity of automobile angle accurately.Compare with the variation of employing angular velocity sensor measured automobiles angle, this measurement signal directly comes from the rotation change of wheel, therefore more can directly reflect the real change of automobile angle, precision is higher, has avoided row errors more above-mentioned to produce simultaneously.Shortcoming is: because measure is the angular velocity varies of trailing wheel, and trailing wheel is a follower, and has certain error between the front-wheel (driving wheel) in the variation of angle, but this error is to eliminate by wheelbase and the left and right wheels distance of calculating automobile; In addition, under the situation that trailing wheel (skids such as road) under special circumstances, can not reflect the variation of angle really, but this situation can be solved by judgement to vehicle speed signal; This integrated navigation mode can provide effectively accurate location information for auto navigation software, thereby has improved the performance of auto-navigation system.
CAN-BUS (Controller Area Network BUS) is a kind of serial communication bus of many master modes, and basic design regulation requires that high bit rate is arranged, high anti-electromagnetic interference, and can detect any mistake of generation.Because the CAN serial communication bus has these characteristics, it is subjected to widespread use very naturally in automobile, manufacture and aircraft industry.
The application of CAN-BUS bussing technique is the engine system of automobile, body control system, meter system, a/c system, fuel oil system, various control datas such as sound equipment and navigationsystem, couple together by high speed or low speed bus, reduce the quantity of various wire harness in the orthodox car, improved the safety and the reliability of auto electric control system, simultaneously, also improved the degree of share of various data, for the intelligent diagnostics of automobile provides the actv. means.Along with the development of domestic automobile technology, the part automobile has been brought into use control and the data transmission systems of CAN bussing technique as car load or part electric system (as the instrument system).For example, the Polo of Shanghai Volkswagen production is with pacifying car just takes the lead in having adopted the CAN-BUS bus control technology on the way.
Simultaneously, (comprise TOYOTA abroad, KENWOOD etc.) well-known vehicle electronic device maker also begins to enter the R and D based on the vehicle electronics product of embedded OS, begins to design the ad-hoc networks agreement vehicle mounted multimedia platform product based on vehicle-mounted CAN and SAE J1850.
The utility model content
The purpose of this utility model is to have overcome above-mentioned shortcoming of the prior art, provides a kind of and can realize calculating more accurately that navigation and multimedia controllable function, simple and practical, swift and convenient to operate, stable and reliable working performance, Applicable scope are comparatively widely based on the vehicle-mounted reckoning navigation and the multimedia platform system of Controller Area Network BUS.
In order to realize above-mentioned purpose, vehicle-mounted reckoning navigation and the multimedia platform system based on Controller Area Network BUS of the present utility model has following formation:
Should be based on the vehicle-mounted reckoning navigation and the multimedia platform system of Controller Area Network BUS, its principal feature is, described system comprises navigation/multimedia main control module and GPS functional module, comprise PMU, gps data processing unit, navigation in described navigation/multimedia main control module and calculate the navigation algorithm unit, each unit of described PMU and other all is connected, and described navigation and reckoning navigation algorithm unit are connected with the GPS functional module by described gps data processing unit.
Should also comprise the automobile electronic system interface module based on the vehicle-mounted reckoning navigation and the multimedia platform system of Controller Area Network BUS, described navigation and reckoning navigation algorithm unit insert the Vehicle Controller local area network bus by this automobile electronic system interface module.
Should comprise Controller Area Network BUS access unit and other interface access unit based on the vehicle-mounted reckoning navigation and the automobile electronic system interface module in the multimedia platform system of Controller Area Network BUS, described Controller Area Network BUS access unit inserts described Vehicle Controller local area network bus by a main frame major joint, and described other interface access unit is connected with the auxilliary interface of a main frame.
Should also comprise the MP3/MP4 interface module based on the vehicle-mounted reckoning navigation and the multimedia platform system of Controller Area Network BUS, include the media data processing unit in described navigation/multimedia main control module, described media data processing unit is connected in MP3/MP4 media file equipment by this MP3/MP4 interface module.
Should also comprise audio/video handover module, audio/video driver module, LCD display and loudspeaker based on the vehicle-mounted reckoning navigation and the multimedia platform system of Controller Area Network BUS, include navigation/media interface unit in described navigation/multimedia main control module, described navigation/media interface unit is connected with loudspeaker with described LCD display respectively by described audio/video handover module, audio/video driver module successively.
Should also comprise the DVD/CD player based on the vehicle-mounted reckoning navigation and the multimedia platform system of Controller Area Network BUS, described audio/video handover module is connected with described navigation/multimedia main control module by this DVD/CD player.
Should also comprise touch-screen/button based on the vehicle-mounted reckoning navigation and the multimedia platform system of Controller Area Network BUS, and comprise user operation unit in described navigation/multimedia main control module, described user operation unit is connected with described touch-screen/button.
The vehicle-mounted reckoning navigation and the multimedia platform system based on Controller Area Network BUS of this utility model have been adopted, utilized vehicle-borne CAN bus to obtain sensor signal owing to it is ingenious with automobile self, navigation and multi-functional multimedia controllable function have been realized calculating more accurately, simultaneously can utilize the CAN-BUS bus that various sensors of automotive interior and electronic machine are monitored in real time, and the data transmission that changes bus into from the control and the analog signal transmission of traditional separation wire harness, the realization technology of existing multimedia navigation communications platform there has been the improvement of internal, not only simple and practical, and it is swift and convenient to operate, stable and reliable working performance, Applicable scope is comparatively extensive, for further developing of modern automobile electronization equipment established solid foundation.
Description of drawings
Fig. 1 is vehicle-mounted reckoning navigation and the multimedia platform system position view in whole automobile electronic system based on Controller Area Network BUS of the present utility model.
Fig. 2 is vehicle-mounted reckoning navigation and the multimedia platform entire system function structure scheme drawing based on Controller Area Network BUS of the present utility model.
Fig. 3 is of the present utility model based on the vehicle-mounted reckoning navigation of Controller Area Network BUS and the main system of audio major joint scheme drawing in the multimedia platform system.
Fig. 4 is vehicle-mounted reckoning navigation and the auxilliary interface scheme drawing of the main system of audio in the multimedia platform system based on Controller Area Network BUS of the present utility model.
Fig. 5 is of the present utility model based on the vehicle-mounted reckoning navigation of Controller Area Network BUS and the hardware composition scheme drawing of multimedia platform system for realizing.
The specific embodiment
In order more to be expressly understood technology contents of the present utility model, describe in detail especially exemplified by following examples.
See also Fig. 1 to shown in Figure 5, should be based on the vehicle-mounted reckoning navigation and the multimedia platform system of Controller Area Network BUS, wherein, described system comprises navigation/multimedia main control module and GPS functional module, comprise PMU, gps data processing unit, navigation in described navigation/multimedia main control module and calculate the navigation algorithm unit, each unit of described PMU and other all is connected, and described navigation and reckoning navigation algorithm unit are connected with the GPS functional module by described gps data processing unit.
Wherein, should also comprise the automobile electronic system interface module based on the vehicle-mounted reckoning navigation and the multimedia platform system of Controller Area Network BUS, described navigation and reckoning navigation algorithm unit insert the Vehicle Controller local area network bus by this automobile electronic system interface module; Described automobile electronic system interface module comprises Controller Area Network BUS access unit and other interface access unit, described Controller Area Network BUS access unit inserts described Vehicle Controller local area network bus by a main frame major joint, and described other interface access unit is connected with the auxilliary interface of a main frame.
Simultaneously, should also comprise the MP3/MP4 interface module based on the vehicle-mounted reckoning navigation and the multimedia platform system of Controller Area Network BUS, include the media data processing unit in described navigation/multimedia main control module, described media data processing unit is connected in MP3/MP4 media file equipment by this MP3/MP4 interface module; And this system also comprises audio/video handover module, audio/video driver module, LCD display and loudspeaker, include navigation/media interface unit in described navigation/multimedia main control module, described navigation/media interface unit is connected with loudspeaker with described LCD display respectively by described audio/video handover module, audio/video driver module successively; This system also comprises the DVD/CD player simultaneously, and described audio/video handover module is connected with described navigation/multimedia main control module by this DVD/CD player; Simultaneously, this system also comprises touch-screen/button, comprises user operation unit in described navigation/multimedia main control module, and described user operation unit is connected with described touch-screen/button.
In the middle of reality is used, at first introduce the basic comprising of system of the present utility model:
CAN-bus (Controller Area Network) is a controller local area network, is one of most widely used fieldbus in the world.At first, CAN-bus is designed as the microcontroller communication in the automotive environment, and exchange message between vehicle-mounted each electronic control package ECU forms the Vehicle Electronic Control network.Such as: in engine management system, gearbox control, instrument equipment, the electronics trunk system, all embed the CAN control setup.
Introduce the system works principle below
Reckoning navigation and multimedia platform based on the CAN bus have adopted the CAN bus control technology, can receive relevant automobile sensor signal with ICM (Instrument Cluster Module) by the BCM (Body Computer Module) of automobile, the tacho-pulse data of left and right trailing wheel wherein, are provided from the tacho-pulse of automobile back wheel; When automobile was being turned, the rotating speed of inboard wheel was different with the rotating speed of outside wheel, utilized the difference of this speed just can calculate the variable quantity of automobile angle accurately.Compare with adopting the variation of angular velocity sensor measured automobiles angle, this measurement signal directly comes from the rotation change of wheel, therefore more can directly reflect the real change of automobile angle, and precision is higher, has avoided errors more above-mentioned to produce simultaneously.Shortcoming is be the angular velocity varies of trailing wheel because measure, and trailing wheel is a follower, and has certain error between the front-wheel (driving wheel) in the variation of angle, but this error to be to eliminate by wheelbase and the left and right wheels distance of calculating automobile; In addition, under the situation that trailing wheel (skids such as road) under special circumstances, can not reflect the variation of angle really, but this situation can be solved by judgement to vehicle speed signal; This integrated navigation mode can provide effectively accurate location information for auto navigation software, thereby has improved the performance of auto-navigation system.
Algorithm---the Dead-Reckoning basedWheel-Speed Sensors that the reckoning formula that adopts vehicle wheel rotational speed and vehicle speed signal to combine is navigated.The basis of WSS is to come from automobile ABS (Antilock Brake System) system, it is the system of a standard configuration of present new automobile, generally, the four wheels of automobile can be according to the variation of the angular rate of each wheel, produce electronic pulse signal, and these signals are sent in the abs controller.
When automobile turning, about the angular rate of two wheels rotation be different, utilize the poor of these two pulse rates, the angle that just can calculate automobile changes, and, utilize this principle, system can also to about the aviation value of cireular frequency of two wheels determine the speed of vehicle when keeping straight on.
The formula that departs from for the vehicle course can calculate by following formula:
YawRate(r)rear＝Vrr-Vtr/twr
Here, what Vrr, Vtr represented is the cireular frequency of left and right sides trailing wheel, and what twr represented is the wheelbase width of left and right sides trailing wheel.
Equally, if cireular frequency comes from vehicle front, computing formula is as follows so:
YawRate(r)front＝Vrf-Vrf/twf?cos(§)
Here § is the deflection angle of vehicle, it should be noted that the track of vehicle front change to be that difference according to turn radius changes, if adopt the angular velocity data of front-wheel to calculate departing from of vehicle course, just must notice this factor in algorithm.
Because the needed signal of WSS is the ABS system that comes from automobile, generally, the ABS system can be periodic by CAN or LIN bus, transmit the cireular frequency impulse singla of left and right sides trailing wheel to the BCM of automobile (Body Control Unite) unit, therefore, by changing the agreement of CAN bus, can very easily obtain these data.
Utilize the revolver of sensor acquisition and the speed gauge of right wheel to calculate two-wheeled, and obtain displacement difference Ds in the displacement of N (empirical value) sampling in the cycle.
(1) utilize the triangle relation of Ds and axletree position before sampling and after the sampling can calculate steering angle Dr.
(2) utilize velocity pulse to parse car speed, can solve the next position A in conjunction with current location B and deflection angle Dr.
(3) DR module and GPS locating module obtain the signal resolution positioning solution from DR sensor and GPS receiver respectively.After two positioning solutions pass to the combination computing module, carry out exporting optimum positioning solution to application program after optimum fusion is handled.After sending positioning solution, relevant correction parameter is passed to DR respectively to composite module and the GPS locating module carries out the Filtering Model correction.And position coordinate is converted into the needed latitude and longitude coordinates of navigationsystem (adopting the WGS-84 system of axes usually), and with specific data format output (adopting the output of NEMA0183 host-host protocol usually).
For the self-learning function of DR reckoning formula navigation, specific as follows:
(1) automatic check function of system:
(1. when straight-line travelling, left and right wheels is exported the difference of pulse to the error of calibration vehicle wheel sensor; 2. when left and right turning, left and right wheels is exported the difference of pulse; 3. convert cireular frequency to, and compare) with the course of GPS;
The error of verification velocity pulse (comparing) with the speed of GPS; The automatic verification purpose of system is in order to eliminate the matching error of output pulse of each vehicle speed pulse and left and right wheels and GPS navigation system.
(2) program of the automatic verification of system:
Because product is installed on the vehicle for the first time, system must pass through certain checking routine, obtaining the DR corrected parameter of the best, and is saved in the middle of the internal memory of system; After the automatic verification of system is finished, can provide high-precision integrated navigation position data; Behind the replacement of products vehicle, also need to carry out again the system check program, so that regain system's correction data;
The automatic verification of system is undertaken by following basic step:
(1) selects the zone that the visual field is good, so that obtain good gps signal;
(2) start navigation product, (this time may need 1.5～2 minutes generally speaking because of the different differences to some extent of the gps signal of different regions up to GPS output 3D position data;
(3) actuating vehicle is along about 500 meters distances of straight-line travelling (speed is not less than 40 kilometers/hour).
Introduce the error correction of road coupling and DR below:
In order to improve the precision of integrated navigation and road coupling, further improve accuracy of navigation systems, can also further utilize in the navigation map data storehouse the feature of road angle attribute, position fixing system is done further correction.
Road is being carried out in the digitized process, generally calculate the length and the angle in highway section with road-center, the all angled attribute in each highway section, when the road driving of vehicle in known angle, can think that the course of running car and the angle of road are approximately equalised, and the angle of road all is accurately to measure when mapping, when automobile each angle of turn in the process of moving changes, can obtain by measured automobiles angular velocity varies value, simultaneously, for fear of the generation of cumulative errors, can also utilize the angle variation of road in the data bank that angular velocity varies is revised, to reach pinpoint purpose.
Next be CAN BUS 2.0 Network Control Protocols and automobile intelligent trouble diagnosing:
General vehicle-borne CAN bus system has comprised the vehicle body computing machine altogether, meter system, door device, driving engine, fuel oil, more than 20 node such as air-conditioning can be received the data and the failure message of correlation module by bus interface, utilizes vehicle mounted multimedia navigation and communication information terminal in addition actv. analysis and the processing of these information, can provide driving engine for chaufeur, fuel oil, relevant factors such as water temperature are for safe driving provides active data.
The vehicle mounted multimedia navigation is adopted low speed B-CAN bus transfer with communication information terminal, host-host protocol meets the ISO11898 bus standard, in the selection of bus transceiver and controller, adopt the chip that meets vehicle-mounted bus standard, the bus message agreement can be revised by the requirement of different depots, its bus design standard meets the requirement of most vehicle-mounted CAN bussing technique, for laying a good foundation to the popularization in other depots and overseas OEM market.
See also shown in Figure 1ly, wherein shown the position of system of the present utility model in whole automobile electronic system.This system is integrated by CAN bus and automotive interior network, the vehicle body network generally is divided into Body Control, safety system, transmission and chassis system, media entertainment systems four big local area networks, native system belongs to vehicle entertainment system, insert the media entertainment local area network by CAN, the exchange message main with vehicle body is the speed of car speed and non-driving wheel, is used for calculating navigation.
See also again shown in Figure 2, wherein for calculating navigation and multimedia platform system chart.
This flat-bed core is a navigation/medium main control module, mainly moves navigation software, control media device, reaches audio/video driving and commutation circuit, and navigation software runs on main control module, and by the relevant external device of master control module controls.
Reckoning navigation and multimedia platform work based on the CAN bus are as follows:
● the GPS module receives gps signal and outputs to main control module by serial ports, the data of the GPS processing unit resolving GPS module output of main control module, obtain information such as current warp, latitude coordinate and time, and this information is offered navigation and calculates the navigation algorithm module.
● platform by the CAN bus separately and automotive interior network service, relevant information such as obtain the speed of a motor vehicle, turn to offers the navigation and the reckoning navigation algorithm module of main control module.
● relevant information is carried out related algorithm in the location information of navigation of master control flat-bed and reckoning navigation algorithm module synthesis GPS and the automobile, obtains current tram of vapour and travel direction, and mates on map, carries out digital map navigation.
● obtain other coherent signal of automobile by the automobile electronic system interface unit, show by navigation/medium main control module.
● the input of user operation unit monitoring, processing button and touch-screen, enter corresponding work mode according to user's input, finish different operating processes.For example:
● obtain media file such as MP3/MP4 from USB interface to master control flat-bed media data processing unit, carry out the audio/video decoding of media data and play
● master control flat-bed navigation medium boundary element, send the control signal of controlling audio/video circuit drives and commutation circuit, adjust parameters such as sound size and display brightness, and switch this partial circuit to master control platform or DVD/CD EM equipment module.
See also Fig. 3 and shown in Figure 4 again, this system is by the electronic system of the major joint and the auxilliary interface access automobile of main frame, and the main frame major joint is defined as follows:
| Stitch | Functional definition |
| 01 | Power supply ground |
| 02 | Left front (+) |
| 03 | Left front (-) |
| 04 | Right front (-) |
| 05 | Right front (+) |
| 06 | Left back (+) |
| 07 | Left back (-) |
| 08 | Right back (+) |
| 09 | Right back (-) |
| 10 | Bearing circle button ground |
| 11 | The antenna motor power |
| 12 | Vehicle speed signal |
| 13 | The bearing circle push button signalling |
| 14 | Backlight control signal |
| 15 | |
| 16 | Work/memory power supply |
The auxilliary interface of main frame is defined as follows:
| Stitch | Functional definition | Explain |
| 01 | REVERSE?SIGNAL | Astern signal |
| 02 | CAN+ | |
| 03 | CAN- |
| 04 | TEL_AUDIO(+) | The hands-free phone sound signal+ |
| 05 | TEL_AUDIO(-) | The hands-free phone sound signal- |
| 06 | CCD_CLK | The reverse radar system clock signal |
| 07 | CCD_DATA | The reverse radar system data-signal |
| 08 | CCD_VIDEO_IN | The input of Reverse Sensor vision signal |
| 09 | CCD_SHIELD | Reverse Sensor video masking ground |
| 10 | KEY_GND | Bearing circle button ground |
| 11 | KEY_SIGNAL | The bearing circle push button signalling |
| 12 | TEL_MUTE | The hands-free phone mute signal |
| 13 | ||
| 14 | GND | Hand-free telephone system ground |
| 15 | ||
| 16 |
Because plateform system of the present utility model adopts low speed B-CAN bus transfer, host-host protocol meets the ISO11898 bus standard, adopted the chip that meets vehicle-mounted bus standard in the selection of bus transceiver and controller, its bus design standard meets the requirement of most vehicle-mounted CAN bussing technique.
Senior commercial vehicle Body Control of the B12 of Qirui Automobile Co., Ltd and data transmission have adopted the CAN bussing technique, and the bus system of car load is by constituting with lower module:
＊BCM?Body?Computer?Module
＊ICM?Instrument?Cluster?Module
＊DDM?Driver?Door?Module
＊PDM?Passengers?Door?Module
＊TDM?Trunk?Door?Module
＊CLM?Climate?Module?Master
＊CLM2?Climate?Module?Two
＊RRM?Radio?Receiver?Module
＊TPM?TirePressure?Module
＊ABM?Air?Bag?Module
＊ECM?Engine?Control?Module
＊BSM?BrakeSystem?Module
＊SAM?Steering?Angle?Module
＊EDM?Electronic?Damping?Module
＊TCM?Transmission?Control?Module
＊DSM?DriverSeat?Module
＊PSM?Passenger?Seat?Module
The design of its bus system is according to the CAN2.0 of BOSCH company production-release design, by BCM module and ICM module, provide navigationsystem needed vehicle speed signal, trailing wheel cireular frequency impulse singla, astern signals etc. are for the reckoning navigation that realizes WSS provides basic condition with GPS integrated navigation technology.
The product architecture that adopts this plateform system to realize sees also shown in Figure 5, wherein:
Master cpu has adopted the 32bitRISC chip of SHARP industrial grade.Its kernel is ARM922T, and dominant frequency 200MHz operating system adopts Microsoft WIN CE 4.2 NET.
The flat-bed function is as follows, and it finishes following radical function:
The DVD/CD/MP3 Play Control;
Wherein, from the sensor signal of automobile, mainly contain following type:
The automotive speed sensor state;
The left rear wheel impulse singla;
Off hind wheel pulse transducer state;
Left back stoplight stop lamp signal;
Application software comprises:
Map datum online upgrading software;
By above technical scheme, realized reckoning navigation and the multimedia platform based on the CAN bus of the present utility model, support the GPS navigation function; Function such as vehicle mounted multimedia such as MP3, MP4; Support the expansion DVD player; Also support directly to obtain the sensor signal of automobile self by the CAN bus, adopt this signal by special algorithm not receiving under the situation of gps signal, calculate navigation.Its hardware components is by vehicle-mounted master control core circuit, gps antenna, the CAN bus controller, read-out, remote controllers etc. partly constitute, adopt Microsoft WIN CE 4.2/5.0NET as operating system, platform software not only can be realized the vehicle mounted guidance function block, and support media playing function, and can control the access of DVD player, of paramount importance is to pass through CAN bus jointing device by this platform, insert the CAN bus in the automobile, BCM (Body Computer Module) and ICM (Instrument Cluster Module) in automobile obtain the automobile speed signal, trailing wheel cireular frequency impulse singla, astern signal, wheelbase in conjunction with automobile, information such as left and right wheels distance have realized in the reckoning navigation that does not have under the condition of gps signal.
Above-mentioned vehicle-mounted reckoning navigation and multimedia platform system have been adopted based on Controller Area Network BUS, utilized vehicle-borne CAN bus to obtain sensor signal owing to it is ingenious with automobile self, navigation and multi-functional multimedia controllable function have been realized calculating more accurately, simultaneously can utilize the CAN-BUS bus that various sensors of automotive interior and electronic machine are monitored in real time, and the data transmission that changes bus into from the control and the analog signal transmission of traditional separation wire harness, the realization technology of existing multimedia navigation communications platform there has been the improvement of internal, not only simple and practical, and it is swift and convenient to operate, stable and reliable working performance, Applicable scope is comparatively extensive, for further developing of modern automobile electronization equipment established solid foundation.
Simultaneously, also have advantage on the following industry:
(1) development of the hardware and software industry of promotion Vehicular navigation system
Compare with vehicle monitoring system, though the technology of Vehicular navigation system is comparatively complicated, cost of product is higher, market development is slow relatively, but from reality, because standard configuration that the GPS auto-navigation system is dispatched from the factory as car load is all had a mind to by China a few carryall manufacturer, like this can be very fast formation demand in batches, and because the auto trade dog-eat-dog, in order to strive for reaching the catbird seat in the industry, each producer can take action rapidly.But hinder at present industrialized development the most distinct issues are hardware and software products that market demands have GPS Vehicular navigation system maturation, therefore, this project implementation will promote the fast development of industrialization.
(2) development of driving automobile map of navigation electronic industry
Compare with the software and hardware on existing certain basis, the contradiction of electronic chart is comparatively outstanding, and is more crucial, also is the reason that can't directly introduce like product abroad.Though domestic have many companies and unit to do many electronic charts, it is few in number really to meet navigate the preferably electronic chart of usefulness of multiple functional covering that Vehicular navigation system uses.Therefore, the promotion that the development in market will be strong hinders the appearance of the relevant laws and regulations of industrialized development, makes the map datum resource really become a new growth engines; The formulation of second propelling vehicle navigationsystem electronic chart standard, the standard industry standard is finished the electronic map database that the unified standard in the whole nation can be shared, thereby promotes the development of industrialization; Thirdly promote the perfect of electronic chart service system; China is in the period of rapid economic development; the capital construction of road is very active; the problem that electronic chart upgrades in time is to influence the key factor of product in marketing; the formation of industrialization will attract vast investor to make an investment in this field; make these companies that enough fund updating map data can be arranged, be customer's service better.
(3) development of drive wireless messages service field
Obtaining of real-time traffic information is the critical function that auto-navigation system is given full play to usefulness, and the transmission of real-time traffic information need be set up perfect information acquisition, information processing and the information transmission system of a cover in the city, this has just promoted the construction and the development of municipal intelligent traffic system, promote wireless communication technology such as GSM, GPRS, the development of FM radio network technology and making full use of of resource simultaneously, thereby driven the development of relevant industries indirectly.
(4) directly combine with depot is professional
Reckoning navigation and the multimedia platform based on the CAN bus set up in exploitation, be product development agreement and relevant enterprise standard according to Qirui Automobile Co., Ltd, the development of the frontier science and technology of aiming our times development, adopt advanced airmanship and theory, improve the means of hardware development, protocol development and application layer development﹠ testing, make it to meet ISO IS 11898 and CAN2.0B in the CAN bus---the technical standard of CAN Specific ation Version 2.0B.By based on the reckoning navigation of CAN bus and the exploitation of multimedia platform, a whole set of system of product design, exploitation, verification experimental verification, small batch production preparation is developed in formation from the hardware and software platform of GPS integrated navigation algorithm, product, foundation is based on the vehicle mounted multimedia navigation product technical standard of CAN bus, formation has the proprietary technology of independent intellectual property right, thereby breaks the monopoly position of overseas enterprise in these fields.
In this specification sheets, the utility model is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from spirit and scope of the present utility model.Therefore, specification sheets and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (7)
1, a kind of vehicle-mounted reckoning navigation and multimedia platform system based on Controller Area Network BUS, it is characterized in that, described system comprises navigation/multimedia main control module and GPS functional module, comprise PMU, gps data processing unit, navigation in described navigation/multimedia main control module and calculate the navigation algorithm unit, each unit of described PMU and other all is connected, and described navigation and reckoning navigation algorithm unit are connected with the GPS functional module by described gps data processing unit.
2, vehicle-mounted reckoning navigation and multimedia platform system based on Controller Area Network BUS according to claim 1, it is characterized in that, described system also comprises the automobile electronic system interface module, and described navigation and reckoning navigation algorithm unit insert the Vehicle Controller local area network bus by this automobile electronic system interface module.
3, vehicle-mounted reckoning navigation and multimedia platform system based on Controller Area Network BUS according to claim 2, it is characterized in that, described automobile electronic system interface module comprises Controller Area Network BUS access unit and other interface access unit, described Controller Area Network BUS access unit inserts described Vehicle Controller local area network bus by a main frame major joint, and described other interface access unit is connected with the auxilliary interface of a main frame.
4, vehicle-mounted reckoning navigation and multimedia platform system based on Controller Area Network BUS according to claim 1, it is characterized in that, described system also comprises the MP3/MP4 interface module, include the media data processing unit in described navigation/multimedia main control module, described media data processing unit is connected in MP3/MP4 media file equipment by this MP3/MP4 interface module.
5, vehicle-mounted reckoning navigation and multimedia platform system based on Controller Area Network BUS according to claim 1, it is characterized in that, described system also comprises audio/video handover module, audio/video driver module, LCD display and loudspeaker, include navigation/media interface unit in described navigation/multimedia main control module, described navigation/media interface unit is connected with loudspeaker with described LCD display respectively by described audio/video handover module, audio/video driver module successively.
6, vehicle-mounted reckoning navigation and multimedia platform system based on Controller Area Network BUS according to claim 5, it is characterized in that, described system also comprises the DVD/CD player, and described audio/video handover module is connected with described navigation/multimedia main control module by this DVD/CD player.
7, according to each described vehicle-mounted reckoning navigation and multimedia platform system in the claim 1 to 6 based on Controller Area Network BUS, it is characterized in that, described system also comprises touch-screen/button, comprise user operation unit in described navigation/multimedia main control module, described user operation unit is connected with described touch-screen/button.
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