CN205158046U - Centralized automobile body control system - Google Patents
Centralized automobile body control system Download PDFInfo
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- CN205158046U CN205158046U CN201520844395.3U CN201520844395U CN205158046U CN 205158046 U CN205158046 U CN 205158046U CN 201520844395 U CN201520844395 U CN 201520844395U CN 205158046 U CN205158046 U CN 205158046U
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Abstract
The utility model discloses a centralized automobile body control system, it includes automobile body CAN network, combination meter and a plurality of BCM module, automobile body CAN internet access to combination meter is all passed through to the BCM module, combination meter is including being used for handling the controller of automobile body information and the memory that the storage has the logic control procedure, the BCM module comprises information acquisition unit, execution unit and CAN transceiver, information acquisition unit and execution unit are connected with the CAN transceiver, the CAN transceiver is connected to automobile body CAN network. Combination meter still integrateed except the function that possesses current combination meter tool to lock and be equipped with logic control function and automobile body information processing function. The consumer of the execution unit export power supply drive vehicle of BCM module. The utility model discloses an in the middle of control core had all transferred to combination meter, the BCM module in all BCM modules and the different motorcycle type was possible in full accord, reduce cost. This scheme is applicable to all automobiles.
Description
Technical field
The utility model relates to automotive control circuit, especially relates to a kind of centralized body control system.
Background technology
The features such as centralized body control system has with low cost relative to distributed automotive body control system, BCM module number is few, and the electrical equipment quantity that single BCM module can drive is many.Therefore in the upper scheme mostly adopting centralized Body Control of the commercial car (as passenger vehicle, bus, tourist bus etc.) that load electrical is more.
Traditional centralized car body control module (being called for short BCM, BodyControlModule), mainly has the functions such as signals collecting, power drive, logic control.
Commercial car conventional at present concentrates the network topology of body control system as shown in Figure 1.Consumer due to commercial car concentrates on the front portion of vehicle, afterbody and vehicle center tip position mostly.The BCM module of body control system in a centralized be mostly made up of the front-end module 2 be connected in vehicle body CAN network 1, rear module 4, top module 3.But the less vehicle of some consumer also can only comprise front-end module, rear module.The more words of consumer also can comprise the BCM module of more than 4 or 4, mainly decide according to the consumer of vehicle.But 3 modules (front end, rear end, top) are schemes the most frequently used on current passenger vehicle.
Due to each BCM module in traditional centralized body control system, have the functions such as signals collecting, power drive, logic control respectively, being equivalent to each BCM module is a control core, has independently logic control program.Even if so just cause the multiple BCM module internal hardwares in same car completely the same, but due to inner control logic inconsistent, car load factory needs to distinguish BCM type of modules and is installed when installing, installation process is too bothered and easily makes mistakes.The manufacturer of BCM module needs to produce the different parts of multiple model simultaneously, and the spare part of follow-up after-sales service also will prepare multiple.Or if the inconsistent logic control of different automobile types consumer is regular inconsistent, the model of the BCM module of different automobile types is also just inconsistent, needs the BCM type kind of production just more many.Adopt traditional centralized body control system not only in installation process, to bring inconvenience to car load factory, add cost in production, management, after-sales service, after sale spare part link also to the supplier of BCM, be not suitable for large batch of production.
Summary of the invention
The technical matters that the utility model BCM mainly solved existing for prior art possesses that Multiple Type causes producing, management, the link cost such as after sale increase, easily make mistakes etc., there is provided a kind of all BCM modules identical, produce, handling cost is low, the centralized body control system that can not make mistakes is installed.
The utility model is mainly solved by following technical proposals for above-mentioned technical matters: a kind of centralized body control system, comprise vehicle body CAN network, combination instrument and several BCM modules, described BCM module is all connected to combination instrument by vehicle body CAN network, described combination instrument comprises controller and storer, described BCM module is made up of information acquisition unit, performance element and CAN transceiver, described information acquisition unit is all connected with CAN transceiver with performance element, and described CAN transceiver is connected to vehicle body CAN network; Described information acquisition unit comprises switch quantity acquisition circuit, voltage resistance signal acquisition circuit, pulse signal acquisition circuit and power feedback signal Acquisition Circuit.
Combination instrument is also integrated with logic control function and the vehicle body information processing function except possessing the standby function of existing combination instrument lockset, each BCM module acquires can be collected and the information be sent in vehicle body CAN network, aggregation process in addition, and logically control program responds according to the vehicle body information gathered.The performance element out-put supply of BCM module drives the consumer of vehicle.Logic control program is stored in storer.Different Acquisition Circuit gathers signals different on automobile.
BCM module has information acquisition (switch acquisition, voltage resistance signals collecting, pulse signal acquisition, power feedback signal collection) and power stage function.And no longer there is logic control function.
BCM module is an information acquisition unit and performance element in the present system, control core has then all been transferred in the middle of combination instrument, avoid multiple BCM module and respectively carry different steering logics, BCM module thus in the BCM module of vehicle all sites and different automobile types can be accomplished completely the same, can be mutually general, model is unified, greatly facilitate production in enormous quantities and the management of BCM module, decrease the trouble of after-sales service and spare part link, save the cost of production, manufacture, management, the link such as after sale.
As preferably, described information acquisition unit is provided with three address wires, and address wire is defaulted as unsettled high efficient circuit.
Same car has multiple BCM module, has identical hardware and software, is identical parts, but the consumer that actual modules drives is different, how to identify that the identity of BCM module is the problem needing to solve.3 lines have been reserved as address wire, for the identification of BCM module identity at the external interface of BCM module for this reason.Address wire have employed and is defaulted as unsettled high efficient circuit, simplifies external cabling.Every root address wire can connect low level or unsettled, therefore has 000 ~ 111 to have 8 kinds of different combinations altogether.Namely same car can be hung at most 8 identical BCM modules and not obscure, 8 BCM modules enough drive consumers all on vehicle.
As preferably, described combination instrument also includes CAN transceiver, and the CAN transceiver of combination instrument is identical with the CAN transceiver structure of BCM module; Described CAN transceiver comprises transmission circuit and a terminal resistance, described terminal resistance first end connects the first communication terminal of transmission circuit, second end of terminal resistance connects the first wire jumper pin, first communication terminal and second communication terminal of transmission circuit are connected to vehicle body CAN network, second communication terminal of transmission circuit also connects the second wire jumper pin, be connected to vehicle body CAN network foremost with the first wire jumper pin of two CAN transceiver of rearmost end and the second wire jumper pin by outside wire jumper short circuit, the first wire jumper pin and the second wire jumper pin of all the other CAN transceiver are unsettled.
Terminal resistance can eliminate the signal reflex of telecommunication cable, and in order to improve the topological ability of network node, CAN two ends need the terminal resistance of the inhibitory reflex being connected to 120 Ω, and it plays very important effect to matching bus impedance.If ignore this resistance, the anti-interference of digital communication and reliability can be made greatly to reduce, even cannot communicate.As shown in Figure 1, in practical application conveniently and to reduce costs the ECU mostly terminal resistance 5 being placed on network two ends inner.BCM module is universal component in this module, is likely placed in the middle of network, is also likely placed on the terminal of network.Need a kind of method the inside terminals resistance of the BCM module being placed on middle part is not accessed, and the BCM module being placed on terminal needs to access this terminal resistance, but the hardware of BCM module can not become again.
This programme directly adds terminal resistance in BCM module, allows the terminal resistance in the BCM module or combination instrument at most two ends become the terminal resistance of CAN network by wire jumper.And the BCM module of centre or combination instrument are due to non-tie jumper, terminal resistance is not linked in CAN network.All BCM modular structures can be identical, and simplify the laying of CAN network.Also only need to change wire jumper when CAN network increasing or reduces BCM module, reduce the difficulty that maintenance circuit improves.
The program selects combination instrument as the advantage of body control system control core:
1, instrument is the essential element of vehicle, without the need to additionally increasing hardware cost;
2, instrument is substantially all different for the control program of the vehicle inside of different models, the logic of Body Control is transplanted to the model that can not increase instrument in instrument, therefore also can not increases extra handling cost and after cost;
3, owing to being transplanted in combination instrument by Body Control logic, each BCM module can accomplish that hardware and software is consistent, and model is unified.
The beneficial effect that the utility model brings is, adopts the body control system of program design, can not increase combination instrument production cost and difficulty, but all vehicles by the BCM module of same model, can simplify the production of BCM module, management; Do not need after sale the stock carrying out BCM module according to different automobile types in process, only need a kind of spare part, saved spare parts cost after sale yet.Adopt the program that passenger car field BCM module is produced in enormous quantities and become possibility, thus greatly reduce the cost of BCM module.
Accompanying drawing explanation
Fig. 1 is a kind of existing body control system structural drawing;
Fig. 2 is a kind of structural representation of the present utility model;
In figure: 1, vehicle body CAN network, 2, front-end module, 3, top module, 4, rear module, 5, terminal resistance, 6, CAN transceiver, 7, terminal resistance, the 8, first wire jumper pin, the 9, second wire jumper pin, 10, combination instrument, 11, BCM module.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: the centralized body control system of one of the present embodiment, as shown in Figure 2, comprise vehicle body CAN network 1, combination instrument 10 and several BCM modules 11, described BCM module is all connected to combination instrument by vehicle body CAN network.Described combination instrument comprise for the treatment of vehicle body information controller and store the storer of logic control program, described BCM module is made up of information acquisition unit, performance element and CAN transceiver, described information acquisition unit is all connected with CAN transceiver with performance element, and described CAN transceiver is connected to vehicle body CAN network.
Combination instrument is also integrated with logic control function and the vehicle body information processing function except having function that general instrument has.Combination instrument can collect each BCM module acquires and the information be sent in vehicle body CAN network, in addition aggregation process.Combination instrument inside, also with logic control program, can respond according to the vehicle body information gathered.Being transmitted control signal to BCM module by vehicle body CAN network, controlling some BCM modules some power stage pin out-put supplies wherein for driving the consumer of vehicle as headlight, front directional, rear directional etc.
BCM module has information acquisition (switch acquisition, voltage resistance signals collecting, pulse signal acquisition, power feedback signal collection) and power stage function.And no longer there is logic control function.
BCM module is an information acquisition unit and performance element in this body control system, and control core has then all been transferred in the middle of combination instrument.Avoid multiple BCM module and respectively carry different steering logics, make the BCM module in the BCM module of vehicle all sites and different automobile types can accomplish completely the same, can be mutually general, model is unified, greatly facilitate production in enormous quantities and the management of BCM module, decrease the trouble of after-sales service and spare part link.Save the cost of production, manufacture, management, the link such as after sale.
Information acquisition unit is provided with three address wires, and address wire is defaulted as unsettled high efficient circuit.
Same car has multiple BCM module, and they have identical hardware and software, is identical parts.But the consumer that actual modules drives is different, how to identify the identity of BCM module.We have reserved 3 lines as address wire, for the identification of BCM module identity at the external interface of BCM module for this reason.Address wire have employed and is defaulted as unsettled high efficient circuit, simplifies external cabling.Every root address wire can connect low level or unsettled, therefore has the combination that 000 ~ 1118 kind different.Namely same car can be hung at most 8 identical BCM modules and not obscure, 8 BCM modules enough drive consumers all on vehicle.
The information interaction of combination instrument and BCM module be divided into each BCM module acquires to reporting of various information assign control command with combination instrument to individual BCM module.Because CAN network information is that broadcast type sends, when namely combination instrument assigns control command to a certain module, other module also can receive orders, so needing to distinguish this signal by the effective protocol of one is which module to perform what operation to.Simultaneously BCM module acquires to the reporting schemes of information be that the data layout of what signal type is uploaded owing to needing to accomplish that program unification can only adopt with which pin of module.That is out at present the commercial car application layer protocol (J1939 agreement) of standard commonly used, need to formulate a special internal car body control module information interaction protocol.
BCM module reports the area protocol form of collection signal as shown in table 1, and SA represents source address, and SA is also different according to the difference of address wire.So combination instrument can distinguish the identity of the BCM module of transmission information according to SA.When BYTE1 position BIT8 is 1, represent address wire be X BCM module acquires to the on-off model of CN2.15 Pin locations be 1, i.e. high level.
Table 1
The area protocol form that combination instrument controls message is as shown in table 2.PS position X*16, X represent the address of the BCM module that needs control.According to the value of PS position in the CAN message ID received, BCM module just can judge whether this order is assigned to oneself.When position 1, BIT8 position in the data bit BYTE1 position received, represent that CN4.15 Pin locations needs to provide a power stage, for driving the consumer on car.
Table 2
Adopt the mode of address wire to realize the identification of BCM module in this scenario, but may occur that after vehicle release interface loosens the situation causing address wire mistake.Need to prevent the appearance of this situation to formulate BCM module identity mistake early warning mechanism.In specific implementation process, the early warning of identity mistake comprises following functions:
A, identity repeat early warning.BCM module needs to comprise identity and repeats early warning, needs to send early warning information, facilitate maintainer to search reason when the address information finding that other BCM module sends is consistent with oneself.
B, identity change early warning.BCM module can store identity during last subnormal work, the ID address obtained when normally working and the address of storage inconsistent time can send early warning information, this early warning information can be clear, to realize the exchange of intermodule.There will be early warning information after changing BCM module, can normally use after knowing this information.
C, illegal identity early warning.Combination instrument can send early warning information when receiving the information not in legal address list.
Terminal resistance can eliminate the signal reflex of telecommunication cable, and in order to improve the topological ability of network node, CAN two ends need the terminal resistance of the inhibitory reflex being connected to 120 Ω, and it plays very important effect to matching bus impedance.If ignore this resistance, the anti-interference of digital communication and reliability can be made greatly to reduce, even cannot communicate.In practical application conveniently and to reduce costs the ECU mostly terminal resistance being placed on network two ends inner.BCM module is likely placed in the middle of network for universal component in this module, is also likely placed on the terminal of network.Need a kind of method the inside terminals resistance of the BCM module being placed on middle part is not accessed, and the BCM module being placed on terminal needs to access this terminal resistance, but the hardware of BCM module can not become again.
As shown in Figure 2, or the CANH of the CAN transceiver 6 of instrument inside modules (the first communication terminal 8) is connected with the CANH line of vehicle body CAN network 1 by the PIN1 terminal of connector, be connected with terminals P IN2 (the first wire jumper pin) through terminal resistance 7 simultaneously.The CANL (the second communication terminal 9) of CAN transceiver is connected with the CANL line of vehicle body CAN network by the terminals P IN4 patched, and the CANL of CAN transceiver is connected with terminals P IN3 (the second wire jumper pin) simultaneously.When combination instrument 10 and BCM module 11 are placed on CAN network two ends, by PIN2, PIN3 terminal by exterior strands short circuit, terminal resistance access just can be realized.Otherwise, PIN2 and PIN3 pin aerial terminal resistance is just disconnected with CAN network.
Also can select the electric component of other except combination instrument as vehicle body logic control core.But combination instrument is vehicle essential element, the words scheme versatility of other parts is selected not have this programme to follow general.As using the core of gateway as vehicle body logic control, but some vehicle can not need gateway.
The one centralized body control system identity method for early warning of the present embodiment, comprises identity and repeats method for early warning, identity change method for early warning and identity change method for early warning.
Identity repeats method for early warning and is specially: when the identity warning module of BCM module finds that the address information that other BCM modules send is identical with the address information of oneself, sends identity repeat early warning information to combination instrument.
Identity changes method for early warning and is specially: identity changes address information when warning module stores the last subnormal work of the BCM module at self place, when identity change warning module finds that the address information of the address information that the BCM module at self place is current and storage is inconsistent, send identity to combination instrument and change early warning information, if receive the identity change confirmation that combination instrument returns, then the address information of storage is updated to current address information, if do not receive identity that combination instrument returns to change confirmation or receive the identity that combination instrument returns and keep confirmation, then the address information stored is not changed, and the follow-up address information adopting storage to address bit during combination instrument transmission information, when receiving the information that combination instrument sends using with information corresponding to address information stored as the information that should receive.
The illegal method for early warning of identity is specially: when combination instrument receives the information of address information not in legal address list, the illegal warning module of identity sends the illegal early warning information of identity, when BCM module receives the illegal early warning information of the identity issuing self, check and correct Self address information.
Specific embodiment described herein is only to the explanation for example of the invention spirit.This programme person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment, but can't depart from the spirit of the invention or surmount the scope that appended claims defines.
Although more employ the terms such as CAN network, BCM module, information acquisition unit herein, do not get rid of the possibility using other term.These terms are used to be only used to describe more easily and explain the essence of this programme; The restriction that they are construed to any one additional is all contrary with the invention spirit.
Claims (3)
1. a centralized body control system, it is characterized in that, comprise vehicle body CAN network, combination instrument and several BCM modules, described BCM module is all connected to combination instrument by vehicle body CAN network, described combination instrument comprises controller and storer, described BCM module is made up of information acquisition unit, performance element and CAN transceiver, and described information acquisition unit is all connected with CAN transceiver with performance element, and described CAN transceiver is connected to vehicle body CAN network; Described information acquisition unit comprises switch quantity acquisition circuit, voltage resistance signal acquisition circuit, pulse signal acquisition circuit and power feedback signal Acquisition Circuit.
2. the centralized body control system of one according to claim 1, is characterized in that, described information acquisition unit is provided with three address wires, and address wire is defaulted as unsettled high efficient circuit.
3. the centralized body control system of one according to claim 1 and 2, is characterized in that, described combination instrument also includes CAN transceiver, and the CAN transceiver of combination instrument is identical with the CAN transceiver structure of BCM module; Described CAN transceiver comprises transmission circuit and a terminal resistance, described terminal resistance first end connects the first communication terminal of transmission circuit, second end of terminal resistance connects the first wire jumper pin, first communication terminal and second communication terminal of transmission circuit are connected to vehicle body CAN network, second communication terminal of transmission circuit also connects the second wire jumper pin, be connected to vehicle body CAN network foremost with the first wire jumper pin of two CAN transceiver of rearmost end and the second wire jumper pin by outside wire jumper short circuit, the first wire jumper pin and the second wire jumper pin of all the other CAN transceiver are unsettled.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114361884A (en) * | 2021-12-27 | 2022-04-15 | 西安现代控制技术研究所 | CAN bus terminal resistor automatic matching design method for boxed missile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114361884A (en) * | 2021-12-27 | 2022-04-15 | 西安现代控制技术研究所 | CAN bus terminal resistor automatic matching design method for boxed missile |
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Address after: 321000 bailongqiao Linjiang Industrial Park, Wucheng District, Jinhua City, Zhejiang Province Patentee after: ZHEJIANG ZHONGKE ZHENGFANG ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 8 / F, Jinhua Science Park, Chinese Academy of Sciences, 589 Longtan Road, Wucheng District, Jinhua City, Zhejiang Province, 321000 Patentee before: ZHEJIANG ZHONGKE ZHENGFANG ELECTRONIC TECHNOLOGY Co.,Ltd. |