CN111541600B

CN111541600B - Bus network generation method and device applied to weaponry

Info

Publication number: CN111541600B
Application number: CN202010440727.7A
Authority: CN
Inventors: 陈雷
Original assignee: Beijing Runke General Technology Co Ltd
Current assignee: Beijing Runke General Technology Co Ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2022-04-26
Anticipated expiration: 2040-05-22
Also published as: CN111541600A

Abstract

The invention discloses a bus network generating method and a device applied to weaponry.A CANFD bus is adopted as a communication bus, and network node parameters and wire harness parameters of the bus network are designed to constrain node circuits and parameters in the node circuits, so that the CANFD bus network can be applied to the weaponry; the highest communication rate of the CANFD bus can reach 5Mbps, and is improved by more than 125% compared with the traditional communication rate, so that the communication rate is greatly improved; the CANFD bus is the upgrading of the CAN bus, so that the communication efficiency is greatly improved, the CANFD bus has networking characteristics, and the increase or decrease of nodes cannot influence the network architecture, so that the communication architecture is more flexible; and compared with an MIL-STD-1553B bus, the cost of the node is lower, so that the cost performance of the bus is greatly improved, and the development of weaponry is facilitated.

Description

Bus network generation method and device applied to weaponry

Technical Field

The invention relates to the technical field of bus networks, in particular to a bus network generation method and device applied to weaponry.

Background

In the prior art, an MIL-STD-1553B bus is mainly used as a large-scale weapon equipment bus, and the MIL-STD-1553B bus is used as a real-time deterministic multi-channel data distribution communication bus, can be networked, has a redundancy characteristic, and is a communication bus widely applied to weapon equipment. For small arms equipment, an RS422/CAN bus is mainly adopted at present, the RS422 bus is a full-duplex communication bus, the main communication form is point-to-point communication, and the communication speed is generally within 800 kbps; the CAN bus is a bus based on CSMA/CD mechanism, the main communication form is networking communication, and the communication rate is generally within 500 kbps.

In practical application, the MIL-STD-1553B bus has the communication rate of 1Mbps/4Mbps, but the cost of bus nodes is high, and the cost performance of the nodes is low, so that the development cost of weaponry is high. The communication rate of the RS422 bus is low, point-to-point communication occupies more communication lines in equipment, and the communication architecture is not flexible; the communication rate of the CAN bus is not high, but because of the limitation of the communication format of the CAN bus, each frame of message only contains 8bytes of data, and the communication efficiency is low.

In conclusion, the communication buses used on the existing weaponry have certain limitations, and the cost performance of the buses is not high, so that the development of the weaponry is restricted.

Disclosure of Invention

In view of the above, the present invention discloses a bus network generation method and apparatus applied to weaponry, so as to implement that a CANFD bus is adopted as a communication bus, and by designing network node parameters and harness parameters of a bus network, a node circuit and each parameter in the node circuit are constrained, so that the CANFD bus network can be applied to weaponry; the highest communication rate of the CANFD bus can reach 5Mbps, and is improved by more than 125% compared with the traditional communication rate, so that the communication rate is greatly improved; the CAN FD bus is the upgrading of the CAN bus, so the communication efficiency is greatly improved; the CANFD bus has networking characteristics, and the increase or decrease of nodes cannot influence the network architecture, so that the communication architecture is more flexible; and compared with an MIL-STD-1553B bus, the cost of the node is lower, so that the cost performance of the bus is greatly improved, and the development of weaponry is facilitated.

A bus network generation method for weaponry applications, comprising:

taking a CANFD bus as a communication bus, and determining network node parameters according to a preset network node design criterion;

determining a wire harness parameter according to a preset wire harness physical medium design criterion;

circuit structures of two master nodes and n subnodes are respectively determined, the circuit structures include: a node communication circuit;

and based on the network node parameters, the wire harness parameters and preset communication network design criteria, adopting a bus type network topology form, taking two main nodes as two ends of a communication bus, and connecting the main nodes and the n sub-nodes in a hand-in-hand connection manner to obtain the CANFD bus network.

Optionally, the node communication circuit includes: the CANFD transceiver comprises a MCU, a CANFD controller, an isolation circuit, a CANFD transceiver and a node communication peripheral circuit which are connected in sequence, wherein a CANFD high-level interface and a CANFD low-level interface which are used as node communication interfaces are arranged on the CANFD transceiver.

Optionally, the node communication peripheral circuit includes: a filter capacitor and an electrostatic impeder ESD protection circuit;

the filter capacitor includes: one end of the first capacitor is connected with the CANFD high-level interface, the other end of the first capacitor is grounded, one end of the second capacitor is connected with the CANFD low-level interface, and the other end of the second capacitor is grounded;

the ESD protection circuit includes: one end of the first voltage-stabilizing tube is connected with the CANFD high-level interface, the other end of the first voltage-stabilizing tube is grounded, one end of the second voltage-stabilizing tube is connected with the CANFD low-level interface, and the other end of the second voltage-stabilizing tube is grounded.

Optionally, when the node communication peripheral circuit is a node communication peripheral circuit of a master node or a terminal node, the node communication peripheral circuit further includes:

and two ends of the terminal resistor are respectively connected with the CANFD high-level interface and the CANFD low-level interface.

Optionally, the preset communication network design criteria include:

the nodes are accessed on the communication network at unequal intervals;

the interval between different types of cables is larger than the preset interval;

the internal signal of each node is electrically isolated from the bus;

the communication rate of a CANFD transceiver used for bus communication of each node is greater than the highest CANFD bus communication rate;

and a communication cable between the nodes adopts a shielding three-stranded wire.

Optionally, the preset network node design criterion is: the bus length is not more than 16m, the branch length is not more than 0.1m, the node intervals are unequal, the value interval of the node intervals is [0.1, 5] m, and the number of the nodes is not more than 16.

Optionally, the preset wire harness physical medium design criterion is: the impedance range is 90-140 omega, the impedance rated value is 120 omega, the maximum value of the unit resistance is 50m omega/m, the rated value of the unit resistance is 25m omega/m, the maximum value of the unit capacitance is 75pF/m, the rated value of the unit capacitance is 40pF/m, the minimum value of the strand rate is 33Twist/m, and the rated value of the strand rate is 45 Twist/m.

A bus network generating device applied to weaponry, comprising:

the node parameter determining unit is used for determining network node parameters by taking the CANFD bus as a communication bus according to a preset network node design criterion;

the wire harness parameter determining unit is used for determining wire harness parameters according to a preset wire harness physical medium design criterion;

a circuit structure determination unit configured to determine circuit structures of two master nodes and n subnodes, respectively, where the circuit structure includes: a node communication circuit;

and the bus network generation unit is used for adopting a bus type network topology form based on the network node parameters, the wire harness parameters and preset communication network design criteria, taking two main nodes as two ends of a communication bus, and connecting the main nodes and the n sub-nodes in a hand-in-hand connection mode to obtain the CANFD bus network.

Optionally, the preset communication network design criteria include:

the nodes are accessed on the communication network at unequal intervals;

the internal signal of each node is electrically isolated from the bus;

According to the technical scheme, the invention discloses a bus network generation method and a device applied to weaponry, a CAN FD bus is used as a communication bus, network node parameters are determined according to a preset network node design criterion, harness parameters are determined according to a preset harness physical medium design criterion, and circuit structures of two main nodes and n sub-nodes are respectively determined, wherein the circuit structures comprise: and finally, the node communication circuit adopts a bus type network topology form based on network node parameters, wiring harness parameters and preset communication network design criteria, two main nodes are used as two ends of a communication bus, and the main nodes and the n sub-nodes are connected in a hand-in-hand connection mode to obtain the CANFD bus network applied to the weapon equipment. The CANFD bus is used as a communication bus, and the CANFD bus network can be applied to weapon equipment by designing network node parameters and wiring harness parameters of a bus network and constraining each parameter in a node circuit and the node circuit; the highest communication rate of the CANFD bus can reach 5Mbps, and is improved by more than 125% compared with the traditional communication rate, so that the communication rate is greatly improved; the CANFD bus is the upgrading of the CAN bus, so that the communication efficiency is greatly improved, the CANFD bus has networking characteristics, and the increase or decrease of nodes cannot influence the network architecture, so that the communication architecture is more flexible; and compared with an MIL-STD-1553B bus, the cost of the node is lower, so that the cost performance of the bus is greatly improved, and the development of weaponry is facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the disclosed drawings without creative efforts.

FIG. 1 is a flowchart of a bus network generation method applied to weaponry according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a node communication circuit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a node communication peripheral circuit according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a bus type network topology of a CANFD bus according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a hand-in-hand connection of a CANFD bus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a bus network generating device applied to weaponry according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention discloses a bus network generation method and a device applied to weaponry, which take a CAN FD bus as a communication bus, determine network node parameters according to a preset network node design criterion, determine harness parameters according to a preset harness physical medium design criterion, and respectively determine circuit structures of two main nodes and n sub-nodes, wherein the circuit structures comprise: and finally, the node communication circuit adopts a bus type network topology form based on network node parameters, wiring harness parameters and preset communication network design criteria, two main nodes are used as two ends of a communication bus, and the main nodes and the n sub-nodes are connected in a hand-in-hand connection mode to obtain the CANFD bus network applied to the weapon equipment. The CANFD bus is used as a communication bus, and the CANFD bus network can be applied to weapon equipment by designing network node parameters and wiring harness parameters of a bus network and constraining each parameter in a node circuit and the node circuit; the highest communication rate of the CANFD bus can reach 5Mbps, and is improved by more than 125% compared with the traditional communication rate, so that the communication rate is greatly improved; the CAN FD bus is the upgrading of the CAN bus, so the communication efficiency is greatly improved; the CANFD bus has networking characteristics, and the network architecture cannot be influenced by increasing or decreasing nodes, so that the communication architecture is more flexible, and the development of weaponry is facilitated.

In addition, through research and comparison, the cost of each node is lower than 100 yuan, and the cost is more than 1/50 of the MIL-STD-1553B node, so that the cost of the node is low, the communication cost of the weapon equipment is greatly reduced, the cost performance of a bus is improved, and the economic affordability of the weapon equipment is facilitated.

Referring to fig. 1, a flowchart of a bus network generation method applied to weaponry according to an embodiment of the present invention is disclosed, and the method includes the steps of:

s101, determining network node parameters by taking a CANFD bus as a communication bus according to a preset network node design criterion;

the network node parameters in this embodiment include: bus length, spur length, node spacing and node number.

The CAN FD (CAN with Flexible Data-Rate) bus is the upgrade of CAN (Controller Area Network), the communication Rate of Data field CAN reach 5Mbps at most, and the Data bit of each frame CAN reach 64bytes at most, which greatly improves the communication Rate and the communication efficiency compared with the traditional CAN bus. For the CANFD bus, at present, the CANFD bus is mainly applied to the automobile industry, and is not applied to weaponry, and the adaptability to weaponry needs to be studied, and at present, only the CANFD network design method with 2Mbps rate has not yet exerted the maximum performance for the CANFD bus capable of supporting 5Mbps rate.

The preferred arbitration domain of the invention is a CANFD bus with the highest 1Mbps and the data domain with the highest 5Mbps as a communication bus in weaponry, and bps (bits per second) is a common unit of data transmission rate, which means bit rate, bit/second and the number of bits transmitted per second.

Because the CANFD bus is easy to generate resistance mutation and capacitance mutation at branches, and further causes network communication failure, the invention analyzes the characteristics of 5Mbps communication signals, and obtains the design criteria of network nodes according to a large number of test verifications, which is detailed in the parameter table of the network nodes shown in Table 1.

TABLE 1

Parameter(s)	(symbol)	Minimum value	Rated value	Maximum value	Unit of
						Bus length	L	0.1		16	m
Branch length	L₁	-	-	0.1	m
						Pitch of nodes	d	0.1	-	5	m
Number of nodes	n	-	-	16	-

Based on the conclusions obtained in table 1, the preset network node design criteria are: the bus length is not more than 16m, the branch length is not more than 0.1m, the node intervals are unequal, the value interval of the node intervals is [0.1, 5] m, and the number of the nodes is not more than 16.

Step S102, determining a wire harness parameter according to a preset wire harness physical medium design criterion;

wherein, the wire harness parameter in this embodiment includes: impedance, unit resistance, unit capacitance, and strand rate.

The capacitance on the CANFD network includes: node branch capacitance and wiring harness capacitance, and under the condition of table 1 constraint, branch line length is shorter, introduced capacitance is smaller, and the largest capacitance in the whole network is the wiring harness itself, so the invention designs and verifies the physical medium of the wiring harness, specifically as follows:

when the CANFD bus is used for network communication, a terminal resistor R1 needs to be added to each master node, and the value of the terminal resistor R1 may be 120 Ω, so when the cable impedance is also 120 Ω, the cable impedance does not change suddenly, and the communication performance is the best, which concludes that the resistance value of the resistor R1 added to each master node is the same as the cable impedance.

The common communication cable of the CANFD bus is an aluminum cable, the unit resistance and the capacitance of the aluminum cable are related to the material property, and in practical application, the common aluminum cable parameters can be restricted.

When the CANFD bus carries out communication, a twisted pair mode is adopted. The more dense the twisted pair in unit length, the smaller the single wire gap and the higher the anti-interference performance, and meanwhile, considering the current common cable stranding rate, the invention limits the stranding rate range, which is detailed in table 2.

The physical medium design criteria of the wire harness are obtained through the design of the physical medium of the wire harness and the experimental verification, and the details are shown in a wire harness physical medium parameter table shown in a table 2.

TABLE 2

Parameter(s)

(symbol)

Minimum value

Rated value

Maximum value

Unit of

Condition

Impedance (L)

Z

90

120

140

Ω

f＝1MHz

Unit resistance

rb

-

25

50

mΩ/m

25℃

Unit capacitor

Cb

0

40

75

pF/m

Rate of stranding

Rtwist

33

45

-

Twist/m

Based on the conclusion obtained in table 2, the preset wire harness physical medium design criterion is: the impedance range is 90-140 omega, the impedance rated value is 120 omega, the maximum value of the unit resistance is 50m omega/m, the rated value of the unit resistance is 25m omega/m, the maximum value of the unit capacitance is 75pF/m, the rated value of the unit capacitance is 40pF/m, the minimum value of the strand rate is 33Twist/m, and the rated value of the strand rate is 45 Twist/m.

Step S103, respectively determining circuit structures of the two main nodes and the n subnodes, wherein the circuit structures comprise: a node communication circuit;

wherein the entire bus network comprises: two main nodes and n subnodes, where n is a positive integer, the circuit structures of the subnodes are the same, and the subnodes mentioned here do not include: and a terminal node.

Specifically, referring to a schematic diagram of a node communication circuit shown in fig. 2, each node communication circuit includes: an MCU (micro controller Unit) 201, a CANFD controller 202, an isolation circuit 203, a CANFD transceiver 204 and a node communication peripheral circuit which are connected in sequence;

the MCU201 and the CANFD controller 202 communicate with each other through an SPI (Serial Peripheral Interface) bus, and the CANFD transceiver 204 is provided with a CANFD high-level Interface, i.e., a CANFD Interface, and a CANFD low-level Interface, i.e., a CANFD Interface, which are node communication interfaces.

It should be noted that the branch capacitance at the node includes: the capacitance generated by the length of the branch cable and the capacitance in the node communication peripheral circuit for interference resistance.

Referring to fig. 3, a schematic diagram of a node communication peripheral circuit is shown, each node communication peripheral circuit including: a filter capacitor and an ESD (electrostatic discharge) protection circuit.

Wherein, filter capacitor includes: the circuit comprises a first capacitor C1 and a second capacitor C2, wherein one end of the first capacitor C1 is connected with a CANFDH interface, the other end of the first capacitor C1 is grounded, one end of the second capacitor C2 is connected with a CANFDL interface, and the other end of the second capacitor C2 is grounded.

The ESD protection circuit includes: the voltage regulator comprises a first voltage regulator tube D1 and a second voltage regulator tube D2, wherein one end of the first voltage regulator tube D1 is connected with a CANFDH interface, the other end of the first voltage regulator tube D1 is grounded, one end of the second voltage regulator tube D2 is connected with a CANFDL interface, and the other end of the second voltage regulator tube D2 is grounded.

The voltage regulator tube is a surface contact type crystal diode made of silicon material, and is a semiconductor device with high resistance before critical reverse breakdown voltage. When the voltage regulator tube is in reverse breakdown, the terminal voltage is almost unchanged in a certain current range (or a certain power loss range), and the voltage regulator tube shows voltage-stabilizing characteristics, so that the voltage regulator tube is widely applied to voltage-stabilizing power supplies and amplitude limiting circuits.

In fig. 3, TXD is a shorthand form of transmit Data transmit (tx) Data, and RXD is a shorthand form of receive Data receive (rx) Data.

In this embodiment, the values of the filter capacitors refer to a filter capacitor parameter table shown in table 3.

TABLE 3

Wherein, C_diffThe node internal differential capacitance is the capacitance measured between CANFDH and CANFDL when the CANFD node is disconnected from the bus.

It should be particularly noted that, for the node communication peripheral circuits corresponding to the master node and the terminal node, the method further includes: a termination resistor R1 (see fig. 3 in detail), two ends of the termination resistor R1 are respectively connected between the CANFDH interface and the CANFDL interface, and the termination resistor R1 functions as: the impedance of the transmission cable is ensured to be continuous, and the signal reflection in the transmission cable is effectively reduced/absorbed.

In this embodiment, the terminal resistance value refers to the terminal resistance parameter table described in table 4.

TABLE 4

Parameter(s)	(symbol)	Minimum value	Rated value	Maximum value	Unit of
						Terminal resistor	R1	115	120	125	Ω

It should be particularly noted that, in practical applications, the execution sequence of step S101, step S102 and step S103 is not limited to the execution sequence shown in fig. 1, the execution sequence of the three steps may be determined according to actual needs, and the three steps may also be performed simultaneously.

And S104, based on the network node parameters, the wiring harness parameters and the preset communication network design criteria, adopting a bus type network topology form, taking two main nodes as two ends of a communication bus, and connecting the main nodes and the n sub-nodes in a hand-in-hand connection manner to obtain the CANFD bus network.

The network topology form of the CANFD bus generally includes: star type and bus type, the star type needs additional hub, not applicable to the network topology of weaponry. And the bus type does not need an additional concentrator, so the invention adopts a bus type network topology form of a CANFD bus.

Specifically, referring to a bus type network topology diagram of a CANFD bus shown in fig. 4, n sub-nodes, such as sub-node 1, sub-node 2, and sub-node n shown in fig. 4, are connected between a master node 1 and a master node 2.

For the bus type network topology, if the branch line of each node is too long, the capacitance on the branch line is larger, the attenuation of the signal is larger when the signal passes through the branch node, and the signal is easy to cause larger interference to the 5Mbps signal, even the signal is distorted and cannot be communicated, therefore, the invention adopts a hand-in-hand connection mode to reduce the branch line distance to the maximum extent and reduce the branch line capacitance.

In practical applications, the network topology details may refer to the network topology details table described in table 5.

TABLE 5

Serial number	Node number	Node type	Branch line length (m)	Node spacing (m)	Remarks for note
						1	Node A	Master node	0	0.5
2	Node B	Slave node	0.05	0.6
						3	Node C	Slave node	0	1.5
4	Node D	Slave node	0	3
						5	Node E	Slave node	0.05	2
...	...	...	...	...
						n	Node n	End node	0	1.4	n<16

To facilitate understanding of the hand-in-hand type connection structure, the following detailed description is provided.

Referring to the schematic diagram of the hand-in-hand connection of the CANFD bus shown in fig. 5, a CANFDH interface of a master node 1 is connected to CANFDH interfaces of neighboring sub-nodes, the CANFDH interface connected to the neighboring sub-nodes is connected to a CANFDH interface of the neighboring sub-nodes, and the CANFDH interfaces of the sub-nodes are sequentially connected until the CANFDH interface of the last sub-node is connected to the CANFDH interface of a master node 2. Similarly, the CANFDL interface of the master node 1 is connected to the CANFDL interface of the neighboring child node, the CANFDL interface connected to the neighboring child node is connected to the CANFDL interface of the neighboring child node, and the CANFDL interfaces of the child nodes are sequentially connected until the CANFDL interface of the last child node is connected to the CANFDL interface of the master node 2.

Because of the 5Mbps network, the signal waveform of the data domain waveform is only 200ns, so as to avoid the interference of other devices in the equipment on the network bus, the design rule of the preset communication network is obtained through analysis and test, as follows:

(1) the nodes are accessed at unequal intervals on the communication network.

Because the reflected signal is transmitted with wave crest and trough in space, if the nodes are accessed on the communication network at equal intervals, the wave crest and the trough can be overlapped, so that the amplitude becomes larger, and higher interference is caused. Thus, to minimize the amplitude of the signal reflection waveform, the nodes cannot be accessed at equal intervals on the communication network.

(2) The spacing between the different types of cables is greater than a preset spacing, such as 0.5 m.

Because the control signals are transmitted on the CANFD bus, in order to avoid high-voltage or high-current signals transmitted on a power line in equipment, the control signals on the CANFD bus are interfered by space radiation, and through experimental verification, the interval between different types of cables needs to be more than 0.5 m;

(3) the internal signals of each node are electrically isolated from the bus.

(4) The communication rate of a CANFD transceiver used for bus communication of each node is greater than the highest rate of CANFD bus communication, namely 5 Mbps;

(5) the communication cables between the nodes adopt shielded three-stranded wires, and specific parameters are shown in table 2.

It should be noted that, because the electromagnetic interference on the weaponry is strong, the shielding three-stranded wire is adopted in the invention to effectively prevent the electromagnetic interference.

To sum up, the method for generating a bus network applied to weaponry disclosed by the present invention is to use a CANFD bus as a communication bus, determine network node parameters according to a preset network node design criterion, determine harness parameters according to a preset harness physical medium design criterion, and respectively determine circuit structures of two master nodes and n subnodes, where the circuit structure includes: and finally, the node communication circuit adopts a bus type network topology form based on network node parameters, wiring harness parameters and preset communication network design criteria, two main nodes are used as two ends of a communication bus, and the main nodes and the n sub-nodes are connected in a hand-in-hand connection mode to obtain the CANFD bus network applied to the weapon equipment. The CANFD bus is used as a communication bus, and the CANFD bus network can be applied to weapon equipment by designing network node parameters and wiring harness parameters of a bus network and constraining each parameter in a node circuit and the node circuit; the highest CANFD bus communication rate can reach 5Mbps, which is improved by more than 125% compared with the traditional communication rate, so that the communication rate is greatly improved; the CAN FD bus is the upgrading of the CAN bus, so the communication efficiency is greatly improved; the CANFD bus has networking characteristics, and the network architecture cannot be influenced by increasing or decreasing nodes, so that the communication architecture is more flexible, and the development of weaponry is facilitated.

Corresponding to the embodiment of the method, the invention also discloses a bus network generating device applied to the weapon equipment.

Referring to fig. 6, a schematic structural diagram of a bus network generating device applied to weaponry according to an embodiment of the present invention is disclosed, and the device includes:

a node parameter determining unit 301, configured to determine a network node parameter according to a preset network node design criterion by using a CANFD bus as a communication bus;

A wire harness parameter determining unit 302, configured to determine a wire harness parameter according to a preset wire harness physical medium design criterion;

A circuit structure determining unit 303, configured to determine circuit structures of two master nodes and n subnodes, respectively, where the circuit structure includes: a node communication circuit;

The circuit structures of the node communication circuit and the node communication peripheral circuit can be referred to the discussion of fig. 2 and fig. 3 in the method embodiment, and are not described here.

It should be particularly noted that the execution sequence of the three units, namely, the node parameter determining unit 301, the harness parameter determining unit 302 and the circuit structure determining unit 303, is not limited to the sequence shown in fig. 6, the execution sequence of the three units may be determined according to actual needs, and the three units may also be executed simultaneously.

And the bus network generation unit 304 is configured to use a bus type network topology form based on the network node parameters, the harness parameters and the preset communication network design criteria, use two master nodes as two ends of a communication bus, and connect the master node and the n sub-nodes in a hand-in-hand connection manner to obtain a CANFD bus network.

The hand-in-hand connection mode of the CANFD bus can be seen in fig. 5, and is not described here again.

(6) the nodes are accessed at unequal intervals on the communication network.

(7) The spacing between the different types of cables is greater than a preset spacing, such as 0.5 m.

(8) the internal signals of each node are electrically isolated from the bus.

(9) The communication rate of a CANFD transceiver used for bus communication of each node is greater than the highest rate of CANFD bus communication, namely 5 Mbps;

(10) the communication cables between the nodes adopt shielded three-stranded wires, and specific parameters are shown in table 2.

To sum up, the bus network generating device applied to the weaponry disclosed in the present invention determines network node parameters according to a preset network node design criterion by using a CANFD bus as a communication bus, determines harness parameters according to a preset harness physical medium design criterion, and determines circuit structures of two master nodes and n subnodes, respectively, where the circuit structure includes: and finally, the node communication circuit adopts a bus type network topology form based on network node parameters, wiring harness parameters and preset communication network design criteria, two main nodes are used as two ends of a communication bus, and the main nodes and the n sub-nodes are connected in a hand-in-hand connection mode to obtain the CANFD bus network applied to the weapon equipment. The CANFD bus is used as a communication bus, and the CANFD bus network can be applied to weapon equipment by designing network node parameters and wiring harness parameters of a bus network and constraining each parameter in a node circuit and the node circuit; the highest CANFD bus communication rate can reach 5Mbps, which is improved by more than 125% compared with the traditional communication rate, so that the communication rate is greatly improved; the CAN FD bus is the upgrading of the CAN bus, so the communication efficiency is greatly improved; the CANFD bus has networking characteristics, and the network architecture cannot be influenced by increasing or decreasing nodes, so that the communication architecture is more flexible, and the development of weaponry is facilitated.

It should be noted that, for the specific operation principle of each constituent unit in the device embodiment, please refer to the same corresponding part in the method embodiment.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bus network generation method applied to weaponry is characterized by comprising the following steps:

based on the network node parameters, the wire harness parameters and preset communication network design criteria, adopting a bus type network topology form, taking two main nodes as two ends of a communication bus, and connecting the main nodes and the n sub-nodes in a hand-in-hand connection manner to obtain a CANFD bus network;

wherein the preset communication network design criteria include:

the nodes are accessed on the communication network at unequal intervals;

the internal signal of each node is electrically isolated from the bus;

2. The method of claim 1, wherein the node communication circuit comprises: the CANFD transceiver comprises a MCU, a CANFD controller, an isolation circuit, a CANFD transceiver and a node communication peripheral circuit which are connected in sequence, wherein a CANFD high-level interface and a CANFD low-level interface which are used as node communication interfaces are arranged on the CANFD transceiver.

3. The method of claim 2, wherein the node communication peripheral circuit comprises: a filter capacitor and an electrostatic impeder ESD protection circuit;

4. The method of claim 3, wherein when the node communication peripheral circuit is a node communication peripheral circuit of a master node or a terminal node, the node communication peripheral circuit further comprises:

5. The method of claim 1, wherein the preset network node design criteria are: the bus length is not more than 16m, the branch length is not more than 0.1m, the node intervals are unequal, the value interval of the node intervals is [0.1, 5] m, and the number of the nodes is not more than 16.

6. The method of claim 1, wherein the preset harness physical medium design criteria are: the impedance range is 90-140 omega, the impedance rated value is 120 omega, the maximum value of the unit resistance is 50m omega/m, the rated value of the unit resistance is 25m omega/m, the maximum value of the unit capacitance is 75pF/m, the rated value of the unit capacitance is 40pF/m, the minimum value of the strand rate is 33Twist/m, and the rated value of the strand rate is 45 Twist/m.

7. A bus network generating device for weaponry applications, comprising:

the bus network generation unit is used for adopting a bus type network topology form based on the network node parameters, the wire harness parameters and preset communication network design criteria, taking two main nodes as two ends of a communication bus, and connecting the main nodes and the n sub-nodes in a hand-in-hand connection mode to obtain a CANFD bus network;

wherein the preset communication network design criteria include:

the nodes are accessed on the communication network at unequal intervals;

the internal signal of each node is electrically isolated from the bus;

8. The apparatus of claim 7, wherein the node communication circuitry comprises: the CANFD transceiver comprises a MCU, a CANFD controller, an isolation circuit, a CANFD transceiver and a node communication peripheral circuit which are connected in sequence, wherein a CANFD high-level interface and a CANFD low-level interface which are used as node communication interfaces are arranged on the CANFD transceiver.