CN101870278A - Method for forwarding two-way controller area network (CAN) bus data in central information integrated system - Google Patents
Method for forwarding two-way controller area network (CAN) bus data in central information integrated system Download PDFInfo
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Abstract
The invention discloses a method for forwarding two-way controller area network (CAN) bus data in a central information integrated system. Contents displayed by a liquid crystal display (LCD) comprise vehicle running state and vehicle body state displaying, navigation positioning displaying and backdraught back vision displaying. The method for filtering and forwarding the data between the two ways of CANs comprises the following steps of: a, judging whether the CAN data forwarding is idle or not and whether data exists in a first in first out (FIFO) buffer area of the CAN information or not, if so, executing a step e, otherwise, executing the next step b sequentially; b, reading a frame of data from the buffer area and judging whether the data frame is forwarded or not, if so, executing a step d, otherwise, executing the next process sequentially; c, setting a forwarding busy flag bit, transmitting the data frame to an interface of another way of the CAN, removing the forwarding busy flag bit after transmitting the data frame, and returning to the step a; d, adjusting a data transmitting pointer and processing the data frame; and e, executing the corresponding control displaying in the central information integrated system according to the frame definition, wherein the corresponding control displaying comprises data filtering, and definition of parameter groups and corresponding parameters in the process of forwarding.
Description
The application is dividing an application of following patent application: the applying date of original application is on May 27th, 2009, and application number is 200910069049.1, and its invention and created name is " realizing the multi-purpose vehicle(MPV) central information integrated system that two-way CAN filters and transmits ".
Technical field
The present invention relates to a kind of automobile central information integrated system, particularly a kind of vehicle body CAN/ power CAN bus bridge function, instrument function, navigator fix (GPS) function, vehicle backing backsight function of comprising is in the multi-purpose vehicle(MPV) central information integrated system of one.
Background technology
At present, from the Presentation Function of man-machine interface, most of automobile central information integrated system of China also rests on the traditional function of instrument demonstration, mainly comprises average speed indicator, speed gage, fuel gage, water thermometer, travelled distance and various warning indicator lamp.Medium-to-high grade automobile is furnished with the central information read-out and shows information such as instantaneous oil consumption, average fuel consumption, average ground speed, continuation of the journey mileage, opening/closing door of vehicle state, indoor and outdoor temperature and maintenance prompting on meter system, but back vision function, navigation locating function do not embody on meter system, show but be independent of on the other read-out that meter system is positioned in console.
In addition, from the communication angle, the existing automobile instrument system of China comprises the conventional instrument system that is not with any communication modes and has the meter system of local communication function.In the conventional instrument system, need to gather the voltage signals such as impulse singla of switching value signal, analog signal, frequency change and change in duty cycle.Because the transport property of himself makes instrument display system have the characteristics that real-time is poor, accuracy rate is not high.And the number of signals of required collection is a lot of in meter system, and type of transmission is man-to-man, causes signal acquisition circuit various, has also strengthened impulse singla disturbed risk easily.Another has in the meter system of local communication function, part input information is from the voltage signal that directly changes into from sensor, a part is from Vehicle Body Bus, it is a node as Vehicle Body Bus, and carries out information translation from gateway or the bridge that the informational needs of high-speed CAN bus (power bus) is independent of meter system.
Because various ECU are very big to the sensivity difference that the information transfer on the CAN network postpones in the automobile, therefore, the desired real-time of rapport between electronic fuel injection controller, automatic control of transmission device and the anti-skid brake system controller is very strong, controller such as this class will be as the node of high-speed CAN bus (being power CAN bus), and the car body controller of Lighting Controller, door and window controller, air-conditioner controller and so on wants loose many to the requirement of transmission delay, can be used as the node of low speed bus (being vehicle body CAN bus).
Up to now, business-like automobile instrument system can't realize that integrated high-speed CAN and low speed CAN bus bridge, running state of the vehicle and vehicle body state show, GPS shows, vehicle backing backsight CCD is shown in function all over the body.
Summary of the invention
At above-mentioned prior art, the invention provides a kind of multi-purpose vehicle(MPV) central information integrated system of realizing that two-way CAN filters and transmits, this system can be on the basis of the operability that guarantees transmission data reliability and chaufeur, high integration and the height of realizing man-machine interface are intelligent, and can adapt to various types of product demands by adjusting circuit parameter, on universalization, modularization, seriation degree, increase, thereby simplify production technology, reduce manufacturing cost.And make between CAN network high speed CAN and the low speed CAN bus by the bridge contact, based on the necessary information of task priority exchange, finish sharing of data.
In order to solve the problems of the technologies described above, the present invention realizes the method that two-way CAN bus data is transmitted in the central information integrated system, comprise step: a. judges whether this CAN data forwarding is idle, and in CAN information fifo buffer whether data is arranged; If .f. is execution in step e then, otherwise order is carried out next step; B. read frame data from above-mentioned buffer zone, judge whether this Frame will be transmitted; If .f. is execution in step d then, otherwise order is carried out next process; C. put and transmit busy zone bit, and this Frame is passed to another road CAN interface, send this Frame after, clearly transmit busy beautiful position; Return above-mentioned steps a; D. adjust and send data pointer, handle this Frame; E. carry out corresponding control according to frame definition in this central information integrated system and show, comprising: (1) has separately data area for the CAN information of respective pulses amount, analog quantity, and all adopts the formal definition packing of independent PGN separately; (2) for the CAN information of corresponding switching value, comprising: will concentrate on from the information of driving engine ECU in the data fields of same PDU; To concentrate on from the information of ABS ECU in the data fields of same PDU; To concentrate on from the information of automatic transmission with hydraulic torque converter ECU in the data fields of same PDU; To concentrate on from the information of safety airbag ECU in the data fields of same PDU; To concentrate on respectively from the information of preceding BCMECU in the data fields of two PDU, an information that comprises vehicle body sensor, switch, one comprises headlight group alarm information; To concentrate in the data fields of same PDU from the information of back BCM ECU, comprise back light group alarm information.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention is to be the central information integrated system of carrier with the auto meter, this system all concentrates on navigation locating function, vehicle backing backsight function and travel condition of vehicle Presentation Function in the central information read-out of instrument, can three kinds of interfaces, switch by the button on the instrument face plate with from the information that the CAN bus receives, therefore, this system framework is compared with the scheme of prior art structurally and is more simplified, and has saved the space of manufacturing cost and automobile console greatly.
Entreat in the information integrated system in the present invention, module integrated in meter system the intelligent network bridge of low speed CAN/ high-speed CAN, finish message pick-up, forwarding and the corresponding Presentation Function of system with the shared MCU module of other functional modules, on the basis that guarantees real time of data transmission and accuracy, saved plate level cost.
Description of drawings
Fig. 1 is that the position of automobile central information integrated system of the present invention and CAN bus network concerns scheme drawing;
Fig. 2 is a multi-purpose vehicle(MPV) central information integrated system frame diagram of the present invention;
Fig. 3 is the hardware block diagram of multi-purpose vehicle(MPV) central information integrated system shown in Figure 2;
Fig. 4 is classification feed circuit on multi-purpose vehicle(MPV) central information of the present invention integrated system outside and the plate;
Fig. 5 is the video re-establishing filter circuit in the multi-purpose vehicle(MPV) central information integrated system of the present invention;
Fig. 6 is the two-path video commutation circuit that the GPS module shows and the vehicle backing backsight module shows in the multi-purpose vehicle(MPV) central information integrated system of the present invention;
Fig. 7 is the warning indication LED driving circuit in the multi-purpose vehicle(MPV) central information integrated system of the present invention;
Fig. 8 is the indicator led drive circuit backlight in the multi-purpose vehicle(MPV) central information integrated system of the present invention;
Fig. 9 is the dial plate led drive circuit backlight in the multi-purpose vehicle(MPV) central information integrated system of the present invention;
Figure 10 is the signal amplification circuit of the photosensitive tube in the multi-purpose vehicle(MPV) central information integrated system of the present invention;
Figure 11 is high-speed CAN, the low speed CAN message processing flow chart in the multi-purpose vehicle(MPV) central information integrated system of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to describe in further detail.
As shown in Figure 1, car load network electronic framework among the present invention, comprise power bus node and Vehicle Body Bus node, described power bus node is made up of Engine ECU, Automatic Transmission ECU, ABS ECU and safety airbag ECU, and described Vehicle Body Bus node is made up of front body control ECU and back Body Control ECU; Wherein, described front body control ECU is responsible for gathering vehicle body sensor, combined switch signal and control front body actr; Described back Body Control ECU is responsible for controlling back vehicle body actr; With the vehicular meter system is the central information integrated system UNICOM power bus node and the Vehicle Body Bus node of carrier, and desired data all is to obtain by two-way CAN bus, shows and information storage with filtration and forwarding, the information of finishing network data; Described information content displayed comprises that running state of the vehicle and vehicle body state show, GPS shows and vehicle backing backsight shows, three kinds of display interfaces switch by logic automatic switchover or manual button.
As shown in Figure 2, multi-purpose vehicle(MPV) central information integrated system based on above-mentioned car load network electronic framework, comprise the vehicular meter system that is made of vehicle operating instrument subsystem and vehicle body status panel subsystem, described travel condition of vehicle subsystem is connected with the MCU module by the CAN bus module respectively with vehicle body state subgroup system; The power management module that is used for system's power supply; Described MCU module is connected with led drive circuit backlight by transistor drive circuit; Described MCU module is connected with the modular converter and the central information read-out LCD of MCU interface and video signal interface successively by its input/output port, shows running state of the vehicle and vehicle body state by central information read-out LCD; Described MCU module also is connected with video frequency switching module and GPS module respectively by input/output port, described video frequency switching module is connected with the modular converter of described GPS module with described MCU interface and video signal interface respectively, and described video frequency switching module also is connected with the vehicle backing backsight module; Described central information read-out can show running state of the vehicle and vehicle body status information, comprise such as: total kilometrage/single mileage/instantaneous oil consumption/average fuel consumption/average ground speed/continuation of the journey mileage/vehicle door status/time/indication of fault demonstration/maintenance prompting/gear, oneself, described central information read-out LCD also has GPS and vehicle backing backsight two-path video image shows except that this; Described CAN bus module is integrated with high-speed CAN bus control transceiver module and the total line control transceiver module of low speed CAN, constitutes CAN bridge module thus.That is to say, described CAN bus network bridge module is incorporated in the above-mentioned vehicular meter system, described vehicle operating instrument subsystem is connected with power bus ECU by the power bus interface, described vehicle operating subsystem is connected with four stepping motors by MCU PWM, described four step motor control speed gagees, average speed indicator, water thermometer and fuel gage, the engine speed of this vehicle operating subsystem reflection vehicle, the speed of a motor vehicle, water temperature, fuel liquid level, fuel charge, the engine breakdown state, the engine oil pressure state, the ABS state, shifting state, the anti-theft locking state, the charge system state, the safety air bag state, low state of braking liquid level and water temperature are crossed high state; Described vehicle body status panel subsystem is connected with Vehicle Body Bus ECU by the Vehicle Body Bus interface, seat belt status, car door opening state, boot release state, hand braking state, side-marker lamp's state, passing light state, country beam state, front and back fog lamp state, steering indicating light state, two flashing light state and the key position of described vehicle body status panel subsystem reflection vehicle; As shown in Figure 2, the SCI port of described MCU is by logical drive control dipped beam indicator lamp; Full beam indicator lamp; The adverse-weather lamp indicator lamp; The fog tail lamp indicator lamp; The engine breakdown alarm lamp; Low engine oil pressure alarm lamp; The anti-theft locking system indicator lamp; The seatbelt indicator lamp; The ABS indicator lamp; Hand braking indicator lamp; The low indicator lamp of braking liquid level; Left turn indicator lamp; Right turn indicator lamp; The too high alarm lamp of water temperature; 16 warning indication LED such as charging system indicator and safety air bag indicator lamp.
This shows, central information integrated system of the present invention is as the CAN/CAN bridge, not only can obtain relevant vehicle body status information from low speed vehicle body CAN bus, simultaneously can obtain relevant power, chassis system operational factor and condition information, and realize data filter and forwarding between the two-way CAN from the power bus.In conjunction with the function of Full Vehicle System among the present invention, vehicle body CAN bus message mainly comprises: seat belt status, car door opening state, boot release state, hand braking state, side-marker lamp's state, passing light state, country beam state, front and back fog lamp state, steering indicating light state, two flashing light state, key position etc.; Power CAN bus message mainly comprises: engine speed, the speed of a motor vehicle, water temperature, fuel liquid level, fuel charge, engine breakdown state, engine oil pressure state, SRS state, ABS state, shifting state, anti-theft locking state, charge system state, the low state of braking liquid level, water temperature are crossed high state etc.The central information integrated system has intelligent, can handle, calculate, analyze, judge the data of obtaining from bus, implements various real-time controls and information and shows.Information shows the mode that adopts stepping motor, central information read-out, LED, buzzer phone.Speed gage, average speed indicator, water thermometer, fuel gage adopt stepper motor drive finger to show; Vehicle status information such as instantaneous oil consumption and GPS, vehicle backing backsight video information all can be on the central information read-out switch by automatic or manual and show.Nonserviceable down, bus type digital instrument is stored current state automatically, and data deposit FLASH in, but power down is preserved and can be inquired about on the central information read-out.Various condition informations provide various cautions, indication information by LED.System has diagnosis interface K line, can link to each other with computing machine and uploads data by specialized equipment, is beneficial to further analysis.The form that dial plate employing backlight is responded to automatically and manual regulation combines.The central information integrated system has adopted modular mode in design process, system divides is become different functional modules, has realized universalization, the seriation of system architecture.The parametrization mode is adopted in the design of software, guarantee module portability, by background support software it has been carried out different parameter settings, under the situation that does not change hardware configuration, the individual demand that can adapt to various read-outs and dial plate range greatly reduces the complexity of production.
Describe the formation and the principle of work of each module in the central information integrated system of the present invention below in detail:
The MCU module
As shown in Figure 3, described MCU module adopts Renesas to produce H8SX/1544.The central information integrated system has a large amount of unnecessary data and flows as gateway or bridge, for understanding fully a lot of such data flow and selecting data necessary, just needs high-speed data processor.H8SX/1544 has low-power consumption, performance-oriented 32 bit CPUs.In addition, the data volume of central information read-out is very big, so MCU will use high-capacity flash memory.H8SX/1544 the is built-in flash memory of 512Kb and the SRAM of 24Kb.Peripheral hardware comprises 2 road CAN controllers, No. 6 stepping motor PWM controllers, 16 bit timing devices, UART/ clock synchronous serial interface, sound generator etc. on the standard film.SPI, iic bus interface, 10 A/D converters, 8 D/A converteies have been added simultaneously.Maximum operation frequency is 40MHz.
Power management module
Power on exterior duplex feeding of power management module control system and the plate among the present invention, its circuit constitutes as shown in Figure 4, that is: diode VD1 and diode VD2 parallel connection, and its positive pole links to each other with B+, on its negative pole and the plate+port of 12V (B) is connected.The positive ground of diode VD3, its negative pole links to each other with B+; After five diode VD4, VD5, VD6, VD7 and the VD8 parallel connections, its positive pole and electrical generator output positive voltage links to each other, its negative pole respectively with plate on+12V (E) ,+12V (D) ,+12V (C) ,+12V (B) ,+port of 12V (A) is connected; Be provided with in this circuit and be respectively applied for the low frequency that filters in the power supply, capacitor C 1 and capacitor C 2 and the capacitor C 3 and the capacitor C 4 of radio-frequency interference, wherein, C1, C4 are polar capacitor; System's externally fed is divided into two-way: the one tunnel is normal electric C+12, i.e. storage battery power supply; One the tunnel is igniting back power supply D+12, and promptly after the engine operation, system's power supply is provided by the output voltage that storage battery power supply changes electrical generator into.Power supply is divided into 5 the tunnel by 2 the tunnel again on the plate, is respectively: for MCU power supply and system's power-on self-test, mileage storage, motor return required+12V, as shown in Figure 4+12V (B): indicator backlight required+12V as shown in Figure 4+12V (C); Dial plate backlight required+12V is shown in Figure 4+12V (D); The warning indication LED is required+12V, as shown in Figure 4+12V (E); On the plate other chips or circuit required+12V as shown in Figure 4+12V (A).In addition, after engine operation, the current potential of the output voltage of electrical generator is higher slightly than storage battery current potential, thus according to the characteristic of diode, at this moment+12V (B) provides by generator output voltage, thereby saves accumulator electric-quantity.The required 5V power supply of other chips adopts company of Infineon to produce on MCU of the present invention and the plate TLE4270 and TLE4279 two voltage stabilizing chip.The input voltage of TLE4279 maximum is+45V, and the continuous output current of 150mA can be provided, and has low drain voltage, characteristics that the RESET threshold value is adjustable, and its input end is+12V (B) that output+5V only is the MCU power supply.The input voltage of TLE4270 maximum is+42V, and the continuous output current of 650mA can be provided, and has low drain voltage, characteristics that the RESET time is adjustable, and its input end is+12V (A) that output+5V is other chips or a circuit supply on the plate.
The CAN communication module
As shown in Figure 3, the MCU that central information integrated system of the present invention is selected for use has been integrated with the CAN controller, only needs to be equipped with corresponding C AN transceiver and gets final product.Aspect the power bus interface, need high-revolving CAN transceiver, select the PCA82C250 of NXP for use, its maximum can reach the communication speed of 1MB, has good EMI characteristic.Aspect the Vehicle Body Bus interface, need low-tach CAN transceiver, select the TJA1054 of NXP for use, its maximum can reach the communication speed of 125KB, has good EMI characteristic.
The stepping motor module
As shown in Figure 3, the MCU that this central information integrated system is selected for use is integrated 6 road controllor for step-by-step motor, wherein 4 tunnel functions that can directly finish 24 micro-steppings by the register setting.Control average speed indicator, speed gage, water thermometer and fuel gage respectively.Select VID-23 type stepping motor for use.
The central information display panel module
As shown in Figure 3, described central information read-out driver module adopts VMC256, and it has two kinds of display channels: analog video signal (CVBS) passage and MCU numeric display passage.Its corresponding registers is provided with the switching that realizes two kinds of display channels by MCU.What channel video signal was accepted is composite video signal, and what show on LCD is RGB; The MCU passage can show 256 kinds of colors with 8 bit data bus modes and MCU interface.Can directly receive the ranks coordinate figure, not need to calculate the video memory address.This controller adopts 512K SRAM high-speed cache, and the capacity of display is big, and the TFT imitation screen for 320 * 234 can 4 pages of displaying contents of buffer memory.Also have the address in addition and add 1 function automatically, show to have high speed for picture.
Central information display panel module and MCU communication interface
Adopt I/O to simulate 8 bit data bus modes and finish read-write operation, each data message is shown in read-out in real time.When showing 256 looks, every byte shows a pixel, and data format definition is as follows: DB7 (R2, red high-order), DB6 (R1), DB5 (R0, red low level), DB4 (G2, green high-order), DB3 (G1), DB2 (G0, green low level), DB1 (B1, blue high-order), DB1 (B0, blue low level).Under this interface modes, the central information read-out can show vehicle body status informations such as vehicle health informations such as instantaneous oil consumption and opening/closing door of vehicle in real time.
Central information display panel module and GPS, CCD vision signal communication interface
The video inputs mouth can receive CVBS formula analog signal, and GPS and CCD two-path video signal through behind the video switch circuit on the central information read-out display video image.Described GPS module adopts GB102, has analog rgb, CVBS, the selection of YC video output formats; Configuration is differentiated in 320X240,400X234 or the output of 480X234 video; The stereo output of left and right acoustic channels; Four-wire resistance type touch screen interface and SD memory card interface; Described CCD module adopts 12V power supply and CVBS formula colour imagery shot.
The vision signal of numeral converts analog signal to and can produce glitch noise, and these glitch noises belong to the outer spurious signal of band, can produce image to disturb, so need to increase the video reconstruction filter after the digital video process DAC conversion.Native system design-calculated video reconstruction filter, as shown in Figure 5, the video inputs mouth in the modular converter of described MCU interface and video signal interface receives two-way CVBS formula analog signal, and through two-path video commutation circuit display video image on read-out; Digital video signal carries out the signal filtering processing through the video reconstruction filter after converting analog signal to, the circuit of this video reconstruction filter is: capacitor C 7 links to each other with the video output terminals of CCD with inductance L 1 back in parallel one end, one end links to each other with the NC1 of MAX4567, capacitor C 8 and capacitor C 9 one end ground connection, the other end is connected respectively to the two ends of above-mentioned inductance L 1.
As shown in Figure 6, the MAX4567 that video switch chip in the two-path video commutation circuit that described GPS module shows and the vehicle backing backsight module shows adopts MAXIM company to produce, it is two-way, low voltage, bi-directional RF/video change-over swith, and its peak signal frequency can reach 350MHZ; Under the interface modes of this video switch chip, the central information read-out shows GPS and CCD two-path video signal, and automatically switches to CCD back view picture or hand push button to realize the switching of above-mentioned two-path video by the signal that reverses gear.
Warning indication LED, LED driver module backlight
Because warning indication LED quantity is more, for saving MCU I/O resource, the string of selecting for use Texas Instrument to produce changes and chip TPIC6B595, has 8 tunnel outputs, the power-handling capability of every road 150m A.Warning indication LED driving circuit, as shown in Figure 7.The power-on self-test LED of system is required+and 12V provides by+12V (B), and all the other LED are required+and 12V provides by+12V (E).Native system uses 2 TPIC6B595 to realize cascade, utilizes 5 MCU I/O to realize the controllable function of 16 LED, has satisfied the demand of warning indication LED amount in the system.
Among the present invention, the PWM output port of described MCU module is connected with led drive circuit backlight by transistor drive circuit, and described led drive circuit backlight is divided into indicator led drive circuit backlight and dial plate led drive circuit backlight; As shown in Figure 8, described indicator backlight drive circuit constitutes: NPN type triode VT7 base stage links to each other with the PWM output port TIOCA0 of MCU through R30, emitter is to ground, collecting electrode links to each other through the base stage of a resistance R 31 with positive-negative-positive triode VT8, the emitter of positive-negative-positive triode VT8 links to each other with the negative pole of diode VD35, its positive pole meets electricity+12V (C), and the collecting electrode of positive-negative-positive triode VT8 links to each other with the base stage of NPN type triode VT10 with NPN type triode VT9 respectively through base resistance; When positive-negative-positive triode VT8 conducting ,+12V (C) through electric capacity R32 and resistance R 33 in parallel again with resistance R 34 dividing potential drops after the conducting of control NPN type triode VT9, thereby the control string is at the LED of NPN type triode VT9 collecting electrode; Another road NPN type triode VT10 in like manner.As shown in Figure 9, the formation of described dial plate backlight drive circuit is: the base stage of NPN type triode VT13 links to each other with MCU PWM output port TIOCB0 through a resistance R 43, its emitter is to ground, its collecting electrode links to each other through the base stage of a resistance R 46 with positive-negative-positive triode VT14, its emitter meets electricity+12V (D), arrives ground behind collecting electrode process LED and the loop resistance.
Indicator is backlight all to be to utilize MCU to produce the PWM of EDM Generator of Adjustable Duty Ratio with dial plate brightness regulation principle backlight, controls the conducting degree of triode collecting electrode, emitter, thereby changes LED brightness.The PWM dutycycle is big more, and LED brightness is big more.Be connected on resistance in the LED loop and all adopt the form of the resistance parallel connection of two 1812 encapsulation, 1/2W, prevent to guaranteeing that LED brightness resistor power causes heat-producing situation inadequately.Wherein, indicator LED backlight required+12V provides by+12V (C); Dial plate LED backlight is required+and 12V provides by+12V (D).
The automatic backlight module
Adopt photodiode induced environment light intensity, through behind the signal amplification circuit, make the MCU module obtain different magnitudes of voltage, the MCU module is regulated the brightness of LED backlight according to this voltage signal; Before opening the side-marker lamp, automatically regulating is backlight to work, in case after the side-marker lamp opens, be converted to manual regulation; The structure of described signal amplification circuit, as shown in figure 10, photodiode VT1 positive pole connects+5V, its negative pole links to each other the back to ground with a resistance R 24, and negative pole is connected to the positive input of an op amp LM358, the negative input of this op amp LM358 links to each other the back to ground with R25, the two ends of resistance R 24 link to each other with mouth with the negative input of this op amp LM358 respectively, the positive pole of one diode VD10 links to each other with the mouth of this op amp LM358, and the negative pole of this diode VD10 is connected to the input end of analog signal mouth of MCU module.
Realize the method for data filter and forwarding between the two-way CAN in central information integrated system of the present invention, that is: high speed CAN of the present invention, low speed CAN message processing flow chart may further comprise the steps as shown in figure 11:
A. judge whether this CAN data forwarding is idle, and in CAN information fifo buffer, whether data are arranged; If .f. is execution in step e then, otherwise order is carried out next step;
B. read frame data from above-mentioned buffer zone, judge whether this Frame will be transmitted; If .f. is execution in step d then, otherwise order is carried out next process;
C. put and transmit busy zone bit, and this Frame is passed to another road CAN interface, send this Frame after, clearly transmit busy beautiful position; Return above-mentioned steps a;
D. adjust and send data pointer, handle this Frame;
E. carrying out corresponding control according to frame definition in this central information integrated system shows.
Multi-purpose vehicle(MPV) central information integrated system among the present invention will receive broadcast data frame, the Frame that need be forwarded and destination address three kinds of Frames of Frame for this node address as bridge.3 kinds of Frames corresponding to receiving are provided with 3 receiving filters respectively.In the car load network electronic framework of the present invention, the data frame format of power CAN and vehicle body CAN all is identical.Therefore, adopt direct pass-through mode.CPU adopts interrupt mode to receive the message of two CAN controllers, has adopted FIFO mechanism management in-to-in send buffer simultaneously.Fifo buffer has two pointers, that is: receive data pointer and send data pointer.When two pointers are unequal, prove and have valid data in the buffer zone.If CPU free time this moment, just read frame data and judge by accepting filter whether this Frame needs to be forwarded to another road CAN interface from buffer zone, if need then to transmit these data after putting the busy zone bit of forwarding, clear then the forwarding done zone bit and circulated to judge whether there are valid data in the buffer zone once more.If this Frame does not need to be forwarded, then adjust and send data pointer, put this Frame in order according to the parameter-definition that table 1, table 2, table 3, table 4, table 5, table 6, table 7 and table 8 are formulated, and in the central information integrated system, carry out control or display operation according to the cooresponding data of arrangement each information of back.The adjustment that the data buffer receives data pointer realizes that by receiving interruption subroutine the adjustment that sends data pointer then is to realize by sending interruption subroutine.
The radical function of CAN/CAN bridge is data filter and the forwarding that realizes between the two-way CAN.According to instrument function and bridge function characteristics separately, the present invention comprises in the principle of software design aspect: when not diagnosing, system does not send data to the power bus; The data of different priorities are taked different response modes; Under the normal circumstances, the load factor of vehicle body CAN bus is less than 20%; When detecting vehicle body CAN bus load rate and surpass 20%,, suspend the transmission of partial data by sending relevant out code; Increase software and go to tremble function, prevent because switch from fluttering increases bus load.
The communication physical layer and the data link layer of this agreement meet CAN2.0B, the ID of high-speed CAN adopts the expansion frame of 250bps, the ID of low speed CAN adopts the expansion frame of 100bps, application layer protocol adopts the definition mode of J1939, according to the high more characteristic of the more little priority of ID value, carrying out corresponding control according to frame definition in above-mentioned steps e shows, comprise following operation: for the CAN information of respective pulses amount, analog quantity, has data area separately, all adopt the formal definition packing of independent PGN separately, as shown in table 1.And for the CAN information of corresponding switching value, will concentrate on from the information of driving engine ECU in the data fields of same PDU, as shown in table 2; To concentrate on from the information of ABS ECU in the data fields of same PDU, as shown in table 3; To concentrate on from the information of automatic transmission with hydraulic torque converter ECU in the data fields of same PDU, as shown in table 4; To concentrate on from the information of safety airbag ECU in the data fields of same PDU, as shown in table 5; To concentrate on respectively from the information of preceding BCM ECU in the data fields of two PDU, an information that comprises vehicle body sensor, switch, as shown in table 6, one comprises headlight group alarm information, as shown in table 7; To concentrate in the data fields of same PDU from the information of back BCM ECU, comprise back light group alarm information, as shown in table 8.
Table 1 to table 8 be realize the data filter between the two-way CAN in the central information integrated system of the present invention and transmit in parameter group and relevant parameters definition.Table 1 is to table 8, and Engine ECU SA is 02, and ABS ECU SA is 03, and automatic transmission with hydraulic torque converter ECU SA is 04, and safety airbag ECU SA is 05, and central information integrated system ECU SA is 07, and preceding BCM ECU SA is 08, and back BCM ECU SA is 09.The required data of the various demonstrations of central information integrated system of the present invention are all from two-way CAN bus, realize the filtration and the forwarding of two-way CAN data, and not responsible direct pick-up transducers signal or on-off signal, be 07 situation so in parameter-definition, do not relate to SA.Table 1 shows pulsed quantity, analog quantity:
Table 1
| Signal | ?P | ??D??P | ??PF | ??PS | ??SA | ??PGN | Data length | Data allocations | Resolution | Data area | Side-play amount | Transfer rate |
| Engine speed | ?3 | ??0 | ??FF | ??02 | ??02 | ??65282(??00ff02??) | ?2byte | BYTE0 (most-significant byte) BYTE1 (least-significant byte) | ??0.125??rpm/bi??t | ??0～??8191.8??75rpm | ??0 | ??100??ms |
| The speed of a motor vehicle | ?3 | ??0 | ??FF | ??03 | ??03 | ??65283(??00ff03??) | ?2byte | BYTE0 (most-significant byte) BYTE1 (least-significant byte) | ??1/256??km/h/b??it | ??0～??255.99??6km/h | ??0 | ??100??ms |
| Cooling-liquid temperature | ?7 | ??0 | ??FF | ??05 | ??02 | ??65285(??00ff05??) | ?1byte | ??BYTE0 | ??1??℃/bit | ??-40～??210℃ | ??-40 | ??1s |
| Fuel liquid level | ?7 | ??0 | ??FF | ??06 | ??02 | ??65286(??00ff06??) | ?1byte | ??BYTE0 | ??0.5??L/bit | ??0～??127.5L | ??0 | ??1s |
| Signal | ?P | ??D??P | ??PF | ??PS | ??SA | ??PGN | Data length | Data allocations | Resolution | Data area | Side-play amount | Transfer rate |
| Transient fuel efficient | ?6 | ??0 | ??FF | ??07 | ??02 | ??65287(??00ff07??) | ?2byte | BYTE0 (most-significant byte) BYTE1 (least-significant byte) | ??1/512??L/100k??m/bit | ??0～??127.99??8L | ??0 | ??100??ms |
| Average fuel efficient | ?6 | ??0 | ??FF | ??07 | ??02 | ??65287(??00ff07??) | ?2byte | BYTE2 (most-significant byte) BYTE3 (least-significant byte) | ??1/512??L/100k??m/bit | ??0～??127.99??8L | ??0 | ??100??ms |
| Drive indoor temperature | ?6 | ??0 | ??FF | ??08 | ??08 | ??65288(??00ff08??) | ?2byte | BYTE0 (most-significant byte) BYTE1 (least-significant byte) | ??1/32??℃/bit | ??-273～??1774.0??℃ | ??-27??3 | ??1s |
Wherein: P-priority, DP-data page position, PF-PDU form, PS-PDU details, SA-source address, PGN-parameter group numbering, PDU-protocol Data Unit; The numerical value * resolution+side-play amount that transmits on parameter actual value=bus.
Table 2 shows switching value signal 1;
Table 2
Wherein: P=7, DP=0, PF=FF, PS=09, SA=02, PGN=65289 (00ff09), transfer rate: changing just sends.
Table 3 shows switching value signal 2;
Table 3
Wherein: P=7, DP=0, PF=FF, PS=0A, SA=03, PGN=65290 (00ff0a), transfer rate: changing just sends.
Table 4 shows switching value signal 3;
Table 4
Wherein: P=7, DP=0, PF=FF, PS=0B, SA=04, PGN=65291 (00ff0b), transfer rate: changing just sends.
Table 5 shows switching value signal 4;
Table 5
Wherein: P=7, DP=0, PF=FF, PS=0C, SA=05, PGN=65292 (00ff0c), transfer rate: changing just sends.
Table 6 shows switching value signal 5;
Table 6
Wherein: P=7, DP=0, PF=FF, PS=0D, SA=08, PGN=65293 (00ff0d), transfer rate: changing just sends.
Table 7 shows switching value signal 6;
Table 7
Wherein: P=7, DP=0, PF=FF, PS=0E, SA=08, PGN=65294 (00ff0e), transfer rate: changing just sends.
Table 8 shows switching value signal 7;
Table 8
Wherein: P=7, DP=0, PF=FF, PS=0F, SA=09, PGN=65295 (00ff0f), transfer rate: changing just sends.
Although top invention has been described in conjunction with figure; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; under the situation that does not break away from aim of the present invention, can also make a lot of distortion, these all belong within the protection of the present invention.
Claims (2)
1. method that realizes that in the central information integrated system two-way CAN bus data is transmitted is characterized in that: comprise step:
A. judge whether this CAN data forwarding is idle, and in CAN information fifo buffer, whether data are arranged; If .f. is execution in step e then, otherwise order is carried out next step;
B. read frame data from above-mentioned buffer zone, judge whether this Frame will be transmitted; If .f. is execution in step d then, otherwise order is carried out next process;
C. put and transmit busy zone bit, and this Frame is passed to another road CAN interface, send this Frame after, clearly transmit busy beautiful position; Return above-mentioned steps a;
D. adjust and send data pointer, handle this Frame;
E. in this central information integrated system, carry out corresponding control according to frame definition and show, comprising:
(1) has separately data area for the CAN information of respective pulses amount, analog quantity, and all adopt the formal definition packing of independent PGN separately;
(2) for the CAN information of corresponding switching value, comprising:
To concentrate on from the information of driving engine ECU in the data fields of same PDU;
To concentrate on from the information of ABS ECU in the data fields of same PDU;
To concentrate on from the information of automatic transmission with hydraulic torque converter ECU in the data fields of same PDU;
To concentrate on from the information of safety airbag ECU in the data fields of same PDU;
To concentrate on respectively from the information of preceding BCM ECU in the data fields of two PDU, an information that comprises vehicle body sensor, switch, one comprises headlight group alarm information;
To concentrate in the data fields of same PDU from the information of back BCM ECU, comprise back light group alarm information.
2. the method that realizes that in the central information integrated system two-way CAN bus data is transmitted according to claim 1 is characterized in that:
Step e (1) has separately data area for the CAN information of respective pulses amount, analog quantity, and all adopts the formal definition packing of independent PGN separately; Wherein, the definition of pulsed quantity and analog quantity is:
Wherein: P-priority, DP-data page position, PF-PDU form, PS-PDU details, SA-source address, PGN-parameter group numbering, PDU-protocol Data Unit; The numerical value * resolution+side-play amount that transmits on parameter actual value=bus;
Step e (2) comprises for the CAN information of corresponding switching value:
To concentrate on from the information of driving engine ECU in the data fields of same PDU;
That is: switching value signal 1 is:
Wherein: P=7, DP=0, PF=FF, PS=09, SA=02, PGN=65289 (00ff09), transfer rate: changing just sends;
To concentrate on from the information of ABS ECU in the data fields of same PDU;
That is: switching value signal 2 is:
Wherein: P=7, DP=0, PF=FF, PS=0A, SA=03, PGN=65290 (00ff0a), transfer rate: changing just sends;
To concentrate on from the information of automatic transmission with hydraulic torque converter ECU in the data fields of same PDU;
That is: switching value signal 3 is:
Wherein: P=7, DP=0, PF=FF, PS=0B, SA=04, PGN=65291 (00ff0b), transfer rate: changing just sends;
To concentrate on from the information of safety airbag ECU in the data fields of same PDU;
That is: switching value signal 4 is:
Wherein: P=7, DP=0, PF=FF, PS=0C, SA=05, PGN=65292 (00ff0c), transfer rate: changing just sends;
To concentrate on respectively from the information of preceding BCM ECU in the data fields of two PDU, an information that comprises vehicle body sensor, switch, with 5 expressions of switching value signal, another comprises headlight group alarm information, with 6 expressions of switching value signal;
That is: switching value signal 5 is:
Wherein: P=7, DP=0, PF=FF, PS=0D, SA=08, PGN=65293 (00ff0d), transfer rate: have
Just change and send;
Switching value signal 6 is:
Wherein: P=7, DP=0, PF=FF, PS=0E, SA=08, PGN=65294 (00ff0e), transfer rate: changing just sends;
To concentrate in the data fields of same PDU from the information of back BCM ECU, comprise back light group alarm information;
That is: switching value signal 7 is:
Wherein: P=7, DP=0, PF=FF, PS=0F, SA=09, PGN=65295 (00ff0f), transfer rate: changing just sends.
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