CN101795245A - C302-model gateway control unit - Google Patents
C302-model gateway control unit Download PDFInfo
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Abstract
The invention relates to a C302-model gateway control unit characterized in that a C302 model adopts a bus structure with three CANs (Controller Area Networks) comprising a power CAN, a comfortable information CAN and an instrument diagnosis CAN, and the speeds are respectively 500K, 100K and 500K; a single gateway is designed as a route distribution center of messages and signals according to the Baud rate differences of the signals and the sharing and demands of the signals on each CAN; the route transformation is carried out on the messages with different speeds, the signals are packed and unpacked, and meanwhile, the route distribution center is also the network managing and monitoring center of each CAN bus; the time, the priority and the like of the information interaction among CAN systems are reasonably distributed; the evolution of the bus network from one CAN to a plurality of CANs and from an non-independent gateway to a central gateway is necessarily realized by a route device, and in other words, the development of the gateways is the necessary product for the updating and the function clarification of a network topology, thereby reducing the bus load rate of each subnetwork.
Description
Technical field:
The present invention relates to a kind of C302 vehicle gateway control unit, is the car load network communicating system that is applied to the C302 vehicle.
Background technology:
At present domestic in car, the use of standalone gateway is fewer, and is receiving user's test.One vapour car adopts 1 road CAN design, i.e. minimal configuration at the autonomous vehicle B131 that produces; In order to simplify the car load wire harness, the reliability and stability of assurance function realize bus platformization simultaneously, and increasing control unit all joins the ranks that CAN realizes.Along with the restriction of bus load rate and semiotic function demand, multichannel CAN system is imperative, also is the maximized demand of hardware and software platform.Adopt non-standalone gateway at the M6 platform that produces, promptly certain control unit not only possesses the controlled function of itself, also will realize the specific communication function of gateway, causes the change of network and the replacement to cause great cost pressure and technostress.
The use of standalone gateway in network-bus has following advantage:
The cross-platform integration of network-bus becomes simple and efficient.Next car load network-bus of normal conditions comprises several communication subnets, as the power network-bus, and the vehicle body network-bus, Infotainment bus etc., each subnet is hinge with the standalone gateway.In some cases, as have to certain subnet is upgraded or is replaced by the subnet of another platform, the existence of standalone gateway will be eliminated the influence to other subnets that the subnet upgrading causes, as data form difference or the like, no matter this settling mode is in the time, and aspects such as cost and risk all are best.
ECU supplier's change is unlikely to influence the car load network communication.Under serial automobile development or some other situation, stop production as certain ECU main control chip, certain ECU supplier need change or increase ECU etc., and the existing ECU of new supplier often can't with existing network-bus communication, in this case can be by the communication signal translation conversion of standalone gateway with new ECU, be that Central Terminal Station carries out communication with the standalone gateway between former subnet and the new ECU, the signal that new ECU sends sends to original subnet after translation is changed through standalone gateway, and the signal that new ECU receives is also sent by original subnet, through issuing new ECU again after the standalone gateway translation conversion, other subnets and new ECU can not make any change, and so the communication of car load just can be maintained.
Can handle the accident in the vehicle network-bus development process flexibly.In the network-bus development process of vehicle, OEM is under the pressure of Time To Market, and the pressure of aspects such as cost is added the deficiency of experience, tend to occur some unpredictable accidents, and the existence of standalone gateway can be handled some accident to a certain extent flexibly.The network-bus of China OEM mostly is bottom-up exploitation, has some in the process unavoidably and is not well planned or accident, and by contrast, the network-bus platform with standalone gateway is more suitable for Chinese existing national conditions.
Summary of the invention:
The object of the present invention is to provide a kind of C302 vehicle gateway control unit, it is the nervous centralis at car load networking, has realized the outpost of the tax office function of communication, network management, off-line diagnosis and the inline diagnosis of car load network; Guaranteed the requirement of car load electric function and quiescent current simultaneously; Adopting the main cause of gateway designs also is ordering about of network topology structure, be bus network by one road CAN to multichannel CAN, non-standalone gateway is to the differentiation of central gateway, certainly exist route device and realize, the exploitation that is to say gateway is the inevitable outcome of network topology structure upgrading, function sharpening.
Technical scheme of the present invention is achieved in that C302 vehicle gateway control unit, it is characterized in that: the C302 vehicle adopts 3 road CAN bus structures, comprises power CAN, comfortable information CAN and instrument diagnosis CAN, and speed is respectively 500K, 100K and 500K; According to the difference of the baud rate of signal and signal on each road CAN share and gateway that Demand Design is independent as the route assignment center of a message and signal; The message of different rates is carried out route transform, the packing of signal and unpacking also is the network management Surveillance center of each road CAN bus simultaneously.
The bus network topological structure of described car load is by comprising that power CAN, instrument diagnosis CAN, comfortable information CAN and car body controller LIN network, electronic act window LIN network form, structured flowchart as shown in Figure 1, wherein gateway occupies the core position of whole topological structure, it mainly realizes message routing forwarding, packet filtering and reorganization, the network management work of car load CAN bus system, information interaction between each CAN system is carried out the reasonable distribution of aspects such as time, priority, is that online failure monitoring center, car load quiescent current are the center of network management simultaneously.
Described gateway is as the center of car load configuration store, control unit node loss whether Surveillance center; It will be present in the car load network as the standard configuration of whole subnet, the physical layer of the fault-tolerant CAN of its low speed will be different from physical layer architecture and the parameter designing thereof of high speed power CAN, instrument diagnosis CAN, on comfortable information CAN, adopt and wait the row design, promptly the control unit of each on subnet all possesses equal straight-forward network management function.
Described gateway is the carrier of routing mechanism, is two-way straight-through transmission data, and promptly the data processing between source bus and target bus is finished the conversion of speed simultaneously; The data of source bus can be distributed to the several objects bus by gateway; Two kinds of data routes of gateway processes are respectively message routing and signal route; During route is handled, message ID, message name, all undertaken adaptive the cycle time of message and signal by gateway, comprise whether direct route still needs the gateway reorganization, resolves for counter message signals, cycle message signals, event message signal.
Described message routing definition is exactly the message copy from source bus, be transmitted to target bus then, and the signal of message can not made any change or conversion; Message content on the target bus is the accurate copy of message content on the source bus; Message ID, message name is adapted for the requirement of target bus by gateway; When gateway is received the message of source bus, send to target bus immediately.
In the described signal route pattern, in the message inside that has sent, signal can be converted; The unlike signal of different messages on the source bus can be formed new message on the target bus by gateway reorganization; In order to obtain this correct data parsing, the receiving terminal ECU on the target bus must know the signal format of new message; Message after the reorganization sends by the routing module of intra-gateway; Message ID, message name and cycle time rebuild in the signal regrouping process, and increase the definition of signal validity, guarantee the accuracy of the signal that is routed, are received by target bus then.
Described in the periodic signal route pattern, rate transition is the message modification of cycle time.
The network management of described gateway comprise each control unit power demands, wake sleep mechanism and exceptional communication mode up.
Described gateway will adopt two kinds of strategies that each control unit of power CAN and comfortable information CAN is monitored, and the nodal information with each CAN sends to other two-way CAN subnet simultaneously.
Good effect of the present invention is that the increasing control unit of car load passes through the CAN bus communication, and simply designing is impossible on one road CAN.The introducing of gateway will inevitably reduce the bus load rate of each sub-network;
1, at different functional requirements, the time parameter design of the route of message routing, signal route and even diagnosis message has guaranteed the maximization of car load communication response speed, and the control unit that especially has the Reprogramming function will obtain maximum being benefited.
2, network reaches the Surveillance center of inline diagnosis as the center of car load configuration, is convenient to the allotment of whole vehicle functions, and after-sales service.
3, in the network management, to wake up and sleep self-defined, on international standard, reasonably revise, satisfied the consumption requirement of main engine plants to the car load electrostatic current.
Description of drawings:
Fig. 1 is the structured flowchart of the bus network of car load of the present invention;
Fig. 2 is a gateway high-speed CAN physical layer architecture of the present invention;
Fig. 3 is physical layer architecture and the physical parameter of the fault-tolerant CAN of gateway low speed of the present invention;
Fig. 4 is the state and the conversion of network management of the present invention;
Embodiment:
The present invention will be further described below in conjunction with drawings and Examples:
Embodiment 1:
C302 vehicle gateway control unit is characterized in that: the C302 vehicle adopts 3 road CAN bus structures, comprises power CAN, comfortable information CAN and instrument diagnosis CAN, and speed is respectively 500K, 100K and 500K; According to the difference of the baud rate of signal and signal on each road CAN share and gateway that Demand Design is independent as the route assignment center of a message and signal; The message of different rates is carried out route transform, the packing of signal and unpacking also is the network management Surveillance center of each road CAN bus simultaneously.
The bus network topological structure of described car load is by comprising that power CAN, instrument diagnosis CAN, comfortable information CAN and car body controller LIN network, electronic act window LIN network form, structured flowchart as shown in Figure 1, wherein gateway occupies the core position of whole topological structure, it mainly realizes message routing forwarding, packet filtering and reorganization, the network management work of car load CAN bus system, information interaction between each CAN system is carried out the reasonable distribution of aspects such as time, priority, is that online failure monitoring center, car load quiescent current are the center of network management simultaneously.
Described C302 vehicle gateway control unit CAN physical layer architecture
Gateway is as one of two terminals in the high speed power CAN network, and instrument is diagnosed one of terminal of CAN, and its high-speed CAN part (power CAN, instrument diagnosis CAN) physical layer architecture and parameter designing thereof are shown in Fig. 2 and table 1.
| Symbol | Unit | Numerical value |
| ??C1、C2 | ?? pF | ??＜＝100 |
| ??R1 | ??Ω | ??120 |
| ??C4 | ?? uF | ??0.68 |
| ??R4 | ??Ω | ??1 |
Table 1 gateway high-speed CAN physical layer parameter
Simultaneously, on comfortable information CAN, adopt to wait the row design, promptly the Network Management Function of each control unit on subnet is the same, but gateway as the center of car load configuration store, control unit node loss whether Surveillance center.It will be present in as the standard configuration of whole subnet in the car load network, and the physical layer of the fault-tolerant CAN of its low speed will be different from other node of the fault-tolerant CAN of other low speed, and physical structure and parameter are seen Fig. 3.
As shown in Figure 1, described gateway is the carrier of routing mechanism, and it is two-way straight-through transmission data that major function requires, and promptly the data processing between source bus and target bus is finished the conversion of speed simultaneously.The data of source bus can be distributed to the several objects bus by gateway.Two kinds of data routes of gateway processes are respectively message routing and signal route.During route is handled, message ID, message name, all undertaken adaptive the cycle time of message and signal by gateway, comprise whether direct route still needs gateway reorganization, parsing etc. for counter message signals, cycle message signals, event message signal.
The message routing definition is exactly the message copy from source bus, be transmitted to target bus then, and the signal of message can not made any change or conversion.This just means, the message content on the target bus is the accurate copy of message content on the source bus.Message ID, message name etc. are adapted for the requirement of target bus by gateway.When gateway is received the message of source bus, send to target bus immediately.
In the signal route pattern, in the message inside that has sent, signal can be converted.The unlike signal of different messages on the source bus can be formed new message on the target bus by gateway reorganization.In order to obtain this correct data parsing, the receiving terminal ECU on the target bus must know the signal format of new message.Message after the reorganization sends by the routing module of intra-gateway.Message ID, message name and cycle time rebuild in the signal regrouping process, and are received by target bus.
In the periodic signal route pattern, rate transition is the message modification of cycle time.If generation rate is changed, can be different from the cycle time of the message that has sent on the target bus so on the source bus cycle time of message.If source bus produces the frequency that the frequency of message is higher than target bus demand message, gateway is used and is sent message to target bus slower cycle time so.The request frequency that target bus sends message is higher than the frequency that source bus produces message, in use is unpractical, and this mechanism is not considered.Rate transition usually means and slows down cycle time in this mechanism.In the message routing pattern, do not use rate transition.In a single day source bus receives message, just sends to target bus immediately.If use rate transition in the signal route pattern, the signal of receiving at last on the source bus can be sent to target bus.
As shown in Figure 4, the network management of described gateway comprises the power demands of each control unit, wakes sleep mechanism and exceptional communication mode up, is object with the subsystem, on the basis of OSEK/VDX standard, carries out self-defined.Gateway adopts different way to manages to 3 road CAN bus sub: for the mode of power CAN and instrument diagnosis CAN employing indirect control; Adopt direct way to manage for comfortable/information CAN.
Key component is that the network management behavior of the fault-tolerant CAN of low speed (comfortable information CAN) is comparatively complicated, carries out self-definition design based on the Network Management Function of OSEK standard.The following main state of network management monitoring:: (network management sleep indication), sleep operation (the bus sleep is waited in network management), fault mode (limp-home) and bus sleep (sleep of network management bus) are prepared in the initialization of CAN (network management initialization), start-phase (network management is reset), operation monitoring (network management normal mode), sleep.
The on-line monitoring of described gateway is that gateway will adopt two kinds of strategies that each control unit of power CAN and comfortable information CAN is monitored, and the nodal information with each CAN sends to other two-way CAN subnet simultaneously.At first on power CAN, it is unusual that gateway adopts crucial monitoring messages strategy and each control unit of two kinds of strategy monitoring of full subnet integral monitoring whether bus communication to occur simultaneously.On comfortable information CAN, gateway is by network configuration, and which node at first can discern to have to participate in building ring on the whole network.Monitor the network management message of each control unit simultaneously and can judge whether the state of subnet is normal.In addition, when if this subnet Intranet is closed faults such as existence goes offline, can store the network configuration consistent in the instrument with gateway, other node can normally be built ring, guarantee that the sub-network network management is normal, can not realize fully but relate to, go to read meter information by diagnostic device off-line after sale like this and the diagnosis gateway can be checked out of order source easily with other networking function interactive information.
Claims (8)
1.C302 vehicle gateway control unit, it is characterized in that: the bus network topological structure of car load is made up of power CAN, instrument diagnosis CAN, comfortable information CAN and car body controller LIN network, electronic act window LIN network, the C302 vehicle adopts power CAN, comfortable information CAN and instrument diagnosis CAN3 road CAN bus structures, speed is respectively 500K, 100K and 500K; According to the difference of the baud rate of signal and signal on each road CAN share and gateway that Demand Design is independent as the route assignment center of a message and signal; The message of different rates is carried out route transform, the packing of signal and unpacking also is the network management Surveillance center of each road CAN bus simultaneously; Wherein gateway occupies the core position of whole topological structure, it mainly realizes message routing forwarding, packet filtering and reorganization, the network management work of car load CAN bus system, the information interaction between each CAN system is carried out the reasonable distribution of aspects such as time, priority.
2. C302 vehicle gateway control according to claim 1 unit is characterized in that the center of described gateway as the car load configuration store, and the control unit node loss is whether Surveillance center; It will be present in the car load network as the standard configuration of whole subnet, the physical layer of the fault-tolerant CAN of its low speed will be different from physical layer architecture and the parameter designing thereof of high speed power CAN, instrument diagnosis CAN, on comfortable information CAN, adopt and wait the row design, promptly the control unit of each on subnet all possesses the straight-forward network management function.
3. C302 vehicle gateway control according to claim 1 unit is characterized in that described gateway is the carrier of routing mechanism, is two-way straight-through transmission data, and promptly the data processing between source bus and target bus is finished the conversion of speed simultaneously; The data of source bus can be distributed to the several objects bus by gateway; Two kinds of data routes of gateway processes are respectively message routing and signal route; During route is handled, message ID, message name, all undertaken adaptive the cycle time of message and signal by gateway, comprise whether direct route still needs the gateway reorganization, resolves for counter message signals, cycle message signals, event message signal.
4. C302 vehicle gateway control according to claim 3 unit is characterized in that described message routing definition is exactly the message copy from source bus, be transmitted to target bus then, and the signal of message can not made any change or conversion; Message content on the target bus is the accurate copy of message content on the source bus; Message ID, message name is adapted for the requirement of target bus by gateway; When gateway is received the message of source bus, send to target bus immediately.
5. C302 vehicle gateway control according to claim 3 unit is characterized in that in the described signal route pattern, in the message inside that has sent, signal can be converted; The unlike signal of different messages on the source bus can be formed new message on the target bus by gateway reorganization; In order to obtain this correct data parsing, the receiving terminal ECU on the target bus must know the signal format of new message; Message after the reorganization sends by the routing module of intra-gateway; Message ID, message name and cycle time rebuild in the signal regrouping process, and increase the definition of signal validity, guarantee the accuracy of the signal that is routed, are received by target bus then.
6. C302 vehicle gateway control according to claim 3 unit is characterized in that describedly in the periodic signal route pattern, and rate transition is the message modification of cycle time.
7. C302 vehicle gateway control according to claim 3 unit, the network management that it is characterized in that described gateway comprise each control unit power demands, wake sleep mechanism and exceptional communication mode up.
8. C302 vehicle gateway control according to claim 1 unit, it is characterized in that described gateway will adopt two kinds of strategies that each control unit of power CAN and comfortable information CAN is monitored, the nodal information with each CAN sends to other two-way CAN subnet simultaneously.
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