CN105791025A - Automobile network communication system forward design method - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
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- H—ELECTRICITY
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- H04L67/00—Network arrangements or protocols for supporting network services or applications
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Abstract
The invention relates to an automobile network communication system forward design method, which designs a network communication protocol according to a signal maximum function time requirement, ensures real-time performance of network communication, calculate delay time and remaining time of a message, ensures the reliability of network communication, and comprises the steps of: establishing a network communication structure; conducting automated design by means of a time sequence analysis platform; and carrying out time sequence analysis according to an automated design result. By adopting the forward design method, a network is subjected to time sequence analysis at the beginning of design, the accuracy of design is increased, and workload of subsequent tests can be reduced. At a project design stage, the reliability of network communication protocol design is verified through a time sequence analysis and simulation method; and at a test verification stage, test verification and rectification work is reduced, and the development cycle is shortened.
Description
Technical field
The present invention relates to automotive telematics control field, be specifically related to a kind of automotive networking communication system forward design method.
Background technology
Control the increase of module and the complication of function along with finished vehicle electronic, vehicle-mounted CAN network has become as the first-selection of car electrics engineer, and by the extensive use of Ge great depot.Automotive CAN networkization can not only alleviate the quality of car load, and ensure that each controls interactive information reception and registration promptly and accurately between module, thus improve safety and the comfortableness of car load.For main engine plants, how to carry out CAN network design, be the key of car load networking.Traditional development mode is by main engine plants according to whole vehicle functions demand, and Electrical Engineer and supplier determine the information such as hardware specification, signal list after discussing, and supplier defines according to these specifications and product function and carries out product design.Then submit to main engine plants to build stand to do the test of system integration aspect, rectified and improved by supplier after pinpointing the problems, then carry out the test of a new round.Visible, constituting criterion, the engineer that carries out network development are required high by this design, and agreement correctness depends on development Experience and the design level of engineer.Whether early stage norm-setting is reasonable, whether parameter is formulated reasonable, the integrated of later stage system can be brought very big impact, and once design goes wrong, then rectification inevitably will bring relatively larger workload to both sides of supply and demand, likely can therefore improve R&D costs, delay project process.
In later stage test process, especially in engine bench test, this design exposes significant limitation.Because being difficult to accomplish to simulate all of operating mode in stand, therefore some design defect can not be found in time, thus brings very big hidden danger to product quality.Such as: when test emulation process does not account for certain signal, the situation that this signal is utilized cannot just be predicted, it is possible to bring the loss of signal；This design also is difficult at the beginning of design and just system signal time delay is made correct assessment, and the time delay that especially arbitration contest of some complication systems can inevitably bring brings unpredictable challenge to the stability of network.Therefore, select the method for designing of a kind of advanced person and by advanced design platform, make some problems expose and solve at the design initial stage, be our problem of first considering.
In sum, prior art exists following technical problem: along with the increase of electronic control module, automobile is more and more higher to the requirement of real-Time Signal Transfer.Traditional network design method designs in the early stage, and later stage test rectification, agreement exists the drawback constantly updated, and the durability of platform is also good not, and the experience of being mainly designed to plays a leading role, and seldom has theories integration.
Summary of the invention
It is an object of the invention to provide a kind of automotive networking communication system forward design method, according to signal maximum function time requirement planned network communications protocol, guarantee the real-time of network communication, calculate the time delay of message, remaining time, guaranteeing the reliability of network communication, concrete technical scheme is as follows:
A kind of automotive networking communication system forward design method, comprises the steps:
(1) network communication structure is set up；
(2) the Automation Design is carried out by Time-Series analysis platform；
(3) the Automation Design result according to step (2) carries out Time-Series analysis.
Further, step (1) sets up network communication data base by Time-Series analysis software.
Further, defining reception and the relation of transmission of whole topology of networks and all signals in step (1), network topology structure includes CAN network, speed and CAN node.
Further, in step (2) the Automation Design include the design of gateway, signal group bag subpackage and group bag after message ID, the cycle, byte length distribution.
Further, step (2) is passed through set up signal sequence analytical model and carry out described the Automation Design.
Further, the most harsh conditions of analog simulation in step (3), analyze the transmission lag time of all messages in this case.
Further, described most harsh conditions is that all messages are sent in CAN network at synchronization.
Further, farther including step (4): according to the maximum function time requirement of step (3) signal, simulation analysis confirms real-time and the reliability of system signal transmission.
Further, step (5) is farther included: optimize design further and ensure the reliability of network.
Further, the generation of a signal value is divided into five time periods by described signal sequence analytical model between the use of signal value, including:
TPL: the delay of transmitting terminal, it is packaged into, from signal generation, controller sampling and stabilization, the time consumed frame to signal；
TBT: the delay before transmission, frame enters the time sent, and hereafter arbitration starts；
TT: transmission lag, comprise the time delay of arbitration time, transmission time of consuming of byte and transmission line itself；
TAT: the delay after transmission, the time that signal is extracted；
TSL: the delay of receiving terminal, the time that signal is used, for instance the delay that lamp is bright；
Bus pot life is the computing formula of Bustime_available remaining time (signal) after deducting the delay in all signals transmissions the maximum function time: Bustime_available (sig)=Max_age (sig)-TPL(sig)-TSL(sig)-Input_jittersub-Output_jittersub-Frame_processing_periodsub；
By the signal that gateway route, its bus pot life Bustime_available (sig)=Max_age (sig)-Gatewaydelay-TSL(sig)-Input_jittersub- Output_jittersub-Frame_processing_periodsub；After signal is bundled in frame, the bus pot life of frame is exactly Bustime_available (frm)=min [Bustime_available (sig)allsignalsinframe]；
Wherein, max_age is the maximum time required by functional realiey of definition, and Bustime_available is bus pot life, and Bustime_consumed is bus elapsed time, Input/Output_jittersubIt is the shake of communication protocol stack, Frame_processing_periodsubFrame processes the process cycle that the time is recipient node, GatewaydelayIt it is the sending node delay to this section of gateway；
Wherein, bus elapsed time refers to that a frame message is from group bag to the computing formula being successfully sent to time Bustime_consumed (frm) used bus: Bustime_consumed (frm)=Worst_case_latency (frm)+Frame_period_time (frm)-Frame_processing_periodpublisher+Input_budget_delay(frm)+Output_budget_delay(frm)；
Wherein Worst_case_latency (frm) is the bus time of frame total consumption under worst condition, Frame_period_time (frm) is the frame worst condition in cycle, Input/Output_budget_delay (frm) produces due to protocol stack disposal ability, namely a protocol stack calls the delay that the ability of manageable frame in the cycle produces, Frame_processing_periodpublisherFrame processes the process cycle that the time is sending node.
Ensure the requirement of network security: Bustime_available (frm) > Bustime_consumed (frm).
Compared with currently available technology, the present invention should set up network communication data base, binding signal Time-Series analysis model by Time-Series analysis software, and according to signal maximum function time requirement, simulation analysis confirms real-time and the reliability of system signal transmission.Adopt forward design method, at the beginning of design, just network has been done Time-Series analysis, not only increase the accuracy of design, it is also possible to reduce the workload of later stage test.In the Project design stage, by the reliability of the means checking network communication protocol design that Time-Series analysis emulates, test Qualify Phase, reduce test checking and rectifying and improving, shorten the cycle of exploitation.
Accompanying drawing explanation
Fig. 1 is inventive network communication Top-Down Design flow chart；
Fig. 2 is signal time model schematic；
Detailed description of the invention
Describing the present invention below according to accompanying drawing, it is a kind of preferred embodiment in numerous embodiments of the present invention.
In a preferred embodiment, this method mainly comprises following a few partial content: network communication Top-Down Design flow process, signal time model, time parameter demand, analysis of simulation result, specific as follows:
Network communication Top-Down Design flow process
Fig. 1 describes the network communication Top-Down Design flow process based on signal: first main engine plants need to define reception and the relation of transmission of whole topology of networks (You Ji road CAN network, speed, have how many CAN nodes etc.) and all signals.Next is accomplished by carrying out the Automation Design by Time-Series analysis platform, wherein mainly include the design of gateway, signal group bag subpackage and group bag after message ID, the cycle, byte length distribution；The major technique foundation that realizes of this partial content is signal time model, will be described in detail in next chapters and sections.The result being finally aiming at the Automation Design carries out Time-Series analysis, it is mainly analog simulation in worst situation, namely all messages are sent in CAN network at synchronization, analyze the transmission lag time of all messages in this case, quantify the reliability of whole network, make problem come out and could optimize the reliability of design guarantee network further.
Signal time model
Fig. 2 describes the time model of signal, has divided five time periods by the generation of a signal value between the use of signal value.Five time periods are respectively:
TPL: the delay of transmitting terminal, produce (such as switch motion), controller sampling and stabilization from signal and be packaged into the time consumed frame to signal；
TBT: the delay before transmission, frame enters the time sent, and hereafter arbitration starts；
TT: transmission lag, comprise the time delay of arbitration time, transmission time of consuming of byte and transmission line itself；
TAT: the delay after transmission, the time that signal is extracted；
TSL: the delay of receiving terminal, the time that signal is used, for instance the delay that lamp is bright；
Max_age: the maximum time of function, main engine plants or the maximum time required by functional realiey together defined with supplier, for instance be pulled up to the interval that controller has performed between corresponding actions from parking brake.
Above TBT、TTAnd TATBy by Time-Series analysis platform tools automatically calculate.
Two concepts are described below: bus pot life Bustime_available and bus elapsed time Bustime_consumed.
Bus pot life is the remaining time after the maximum function time deducting the delay in all signals transmissions, i.e. the computing formula of Bustime_available (signal): Bustime_available (sig)=Max_age (sig)-TPL(sig)-TSL(sig)-Input_jittersub-Output_jittersub-Frame_processing_periodsub；By the signal that gateway route, its bus pot life Bustime_available (sig)=Max_age (sig)-Gatewaydelay-TSL(sig)-Input_jittersub-Output_jittersub-Frame_processing_periodsub；After signal is bundled in frame, the bus pot life of frame is exactly Bustime_available (frm)=min [Bustime_available (sig)allsignalsinframe]；Wherein Input/Output_jittersubRefer to that what the number of frames difference that shake mainly each protocol stack of communication protocol stack processes caused can be obtained by supplier, Frame_processing_periodsubFrame processes the time and refers to process cycle of recipient node i.e. the cycle calls time of communication protocol stack and can be obtained by supplier, GatewaydelayBeing sending node can be arranged according to functional requirement to the delay of this section of gateway.
Bus elapsed time refers to that a frame message is from group bag to being successfully sent to time used bus, the i.e. computing formula of Bustime_consumed (frm): Bustime_consumed (frm)=Worst_case_latency (frm)+Frame_period_time (frm)-Frame_processing_periodpublisher+Input_budget_delay(frm)+Output_budget_delay(frm)；Wherein Worst_case_latency (frm) is that under worst condition, the bus time of frame total consumption is calculated automatically by Time-Series analysis platform tools, Frame_period_time (frm) refers to that the frame worst condition in cycle is just can to send such next frame the previous cycle to need to wait a frame period, Input/Output_budget_delay (frm): owing to protocol stack disposal ability produces, namely a protocol stack calls the delay that the ability of manageable frame in the cycle produces, Frame_processing_periodpublisherFrame processes the time and refers to process cycle of sending node i.e. the cycle calls time of communication protocol stack and can be obtained by supplier.
Ensure the requirement of network security: Bustime_available (frm) > Bustime_consumed (frm).Namely when the bus pot life of each frame message is more than its elapsed time, show in worst situation (all messages are sent in CAN network at synchronization), each frame message can both be successfully sent in bus to utilize for other controllers within the scope of receptible maximum delay time, do not result in the delay of function, thus ensuring that real-time and the reliability of whole network.
Time parameter demand
Table 1 is supplier information application form, after building car load network topology structure, controlled in order to what realize sequential, at table 1 except containing some routine informations such as signal type, side-play amount, physical extent, also increasing the time parameter that timing analysis tool is concerned about, including: forward delay interval, reception delay, function time, receiving node requires the minimum update cycle of certain signal, the frame of ECU processes time, input and output shake, input and output delay etc..After accurately inputting these routine informations good and some time parameters, timing analysis tool can according to signal time model, automatically package the distribution of the message ID after subpackage and group bag, cycle, byte length to signal, and carries out simulation analysis according to the signal time model network to designing.
Analysis of simulation result
Build a CAN network, comprise 10 controllers altogether, according to network communication Top-Down Design flow process, design comprises 42 frame messages altogether, lists the ID of 42 frame messages, byte length DLC, message transmission types TransportType, cycle Period, frame transmission time Tx.Time, frame maximum delay time Latency, bus pot life Bustime_available and bus elapsed time Bustime_Consumed such as table 2 simulation analysis in illustrating.By bus pot life Bustime_available in form and bus elapsed time Bustime_Consumed data this network known in worst case, all messages all can be successfully sent in bus within time delay.
By above technical scheme, the method have the advantages that
The Project design stage, by the reliability of the means checking network communication protocol design that Time-Series analysis emulates；
Test Qualify Phase, reduces test checking and rectifying and improving, shortens the cycle of exploitation；
Accumulation car load Design of Network Communication experience.
Table 1 supplier information application form:
Table 2 simulation analysis is illustrated:
Above in conjunction with accompanying drawing, the present invention is exemplarily described; the obvious present invention implements and is not subject to the restrictions described above; as long as have employed the various improvement that the design of the method for the present invention carries out with technical scheme; or not improved that directly apply to other occasion, all within protection scope of the present invention.
Claims (10)
1. an automotive networking communication system forward design method, it is characterised in that comprise the steps:
(1) network communication structure is set up；
(2) the Automation Design is carried out by Time-Series analysis platform；
(3) the Automation Design result according to step (2) carries out Time-Series analysis.
2. automotive networking communication system forward design method as claimed in claim 1, it is characterised in that step (1) sets up network communication data base by Time-Series analysis software.
3. automotive networking communication system forward design method as claimed in claim 1 or 2, it is characterized in that, defining reception and the relation of transmission of whole topology of networks and all signals in step (1), network topology structure includes CAN network, speed and CAN node.
4. the automotive networking communication system forward design method as described in claim 1-3, it is characterised in that in step (2) the Automation Design include the design of gateway, signal group bag subpackage and group bag after message ID, the cycle, byte length distribution.
5. automotive networking communication system forward design method as claimed in claim 4, it is characterised in that pass through to set up signal sequence analytical model in step (2) and carry out described the Automation Design.
6. the automotive networking communication system forward design method as described in claim 1-5, it is characterised in that the most harsh conditions of analog simulation in step (3), analyzes the transmission lag time of all messages in this case.
7. automotive networking communication system forward design method as claimed in claim 6, it is characterised in that described most harsh conditions is that all messages are sent in CAN network at synchronization.
8. the automotive networking communication system forward design method as described in claim 1-7, it is characterized in that, farther including step (4): according to the maximum function time requirement of step (3) signal, simulation analysis confirms real-time and the reliability of system signal transmission.
9. automotive networking communication system forward design method as claimed in claim 8, it is characterised in that farther include step (5): optimize design further and ensure the reliability of network.
10. the automotive networking communication system forward design method as according to any one of claim 5-9, it is characterised in that in described signal sequence analytical model, the generation of a signal value is divided into five time periods between the use of signal value, including:
TPL: the delay of transmitting terminal, it is packaged into, from signal generation, controller sampling and stabilization, the time consumed frame to signal；
TBT: the delay before transmission, frame enters the time sent, and hereafter arbitration starts；
TT: transmission lag, comprise the time delay of arbitration time, transmission time of consuming of byte and transmission line itself；
TAT: the delay after transmission, the time that signal is extracted；
TSL: the delay of receiving terminal, the time that signal is used, for instance the delay that lamp is bright；
Bus pot life is the remaining time after the maximum function time deducting the delay in all signals transmissions
The computing formula of Bustime_available (signal):
Bustime_available (sig)=Max_age (sig)-TPL(sig)-TSL(sig)-Input_jittersub-Output_jittersub-Frame_processing_periodsub；
By the signal that gateway route, its bus pot life
Bustime_available (sig)=Max_age (sig)-Gatewaydelay-TSL(sig)-Input_jittersub-Output_jittersub-Frame_processing_periodsub；After signal is bundled in frame, the bus pot life of frame is exactly Bustime_available (frm)=min [Bustime_available (sig)allsignalsinframe]；
Wherein, max_age is the maximum time required by functional realiey of definition, and Bustime_available is bus pot life, and Bustime_consumed is bus elapsed time, Input/Output_jittersubIt is the shake of communication protocol stack, Frame_processing_periodsubFrame processes the process cycle that the time is recipient node, GatewaydelayIt it is the sending node delay to this section of gateway；
Wherein, bus elapsed time refers to that a frame message is from group bag to the computing formula being successfully sent to time Bustime_consumed (frm) used bus: Bustime_consumed (frm)=Worst_case_latency (frm)+Frame_period_time (frm)-Frame_processing_periodpublisher+Input_budget_delay(frm)+Output_budget_delay(frm)；
Wherein Worst_case_latency (frm) is the bus time of frame total consumption under worst condition, Frame_period_time (frm) is the frame worst condition in cycle, Input/Output_budget_delay (frm) produces due to protocol stack disposal ability, namely a protocol stack calls the delay that the ability of manageable frame in the cycle produces, Frame_processing_periodpublisherFrame processes the process cycle that the time is sending node.
Ensure the requirement of network security: Bustime_available (frm) > Bustime_consumed (frm).
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