CN113114551A - Dual-redundancy LIN bus communication device - Google Patents
Dual-redundancy LIN bus communication device Download PDFInfo
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- CN113114551A CN113114551A CN202110404018.8A CN202110404018A CN113114551A CN 113114551 A CN113114551 A CN 113114551A CN 202110404018 A CN202110404018 A CN 202110404018A CN 113114551 A CN113114551 A CN 113114551A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40013—Details regarding a bus controller
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40169—Flexible bus arrangements
- H04L12/40176—Flexible bus arrangements involving redundancy
- H04L12/40195—Flexible bus arrangements involving redundancy by using a plurality of nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40234—Local Interconnect Network LIN
Abstract
The invention relates to the field related to an LIN bus communication device, in particular to a dual-redundancy LIN bus communication device, which comprises a hardware device and a software system, wherein two sets of LIN equipment are arranged on the hardware device, and each set of equipment comprises an independent bus cable, a microcontroller and an LIN transceiver, so that the comprehensive redundancy of transmission hardware, a physical layer, a data link layer and an application layer is realized, and the operation is carried out in a hot backup mode, so that the normal communication of the whole system is ensured; by arranging the receiving redundancy module and the sending redundancy module in the software system, the main LIN Slave node device and the Slave LIN Slave node device can respectively and independently detect the fault of the channels thereof and automatically switch the communication channels, so that the whole device is more stable in operation; by arranging the redundancy verification device, the installed dual-redundancy LIN bus communication device can be ensured to stably and accurately operate, and the communication reliability of the LIN bus communication device is greatly improved by the design of the hardware and the software.
Description
Technical Field
The invention relates to the field related to LIN bus communication devices, in particular to a dual-redundancy LIN bus communication device.
Background
With the wide application of the LIN bus in the field of automobile electronic control, the number of nodes in the LIN bus network is more and more, and the communication distance is longer and longer. Meanwhile, in order to meet the ISO26262 road function safety standard, a higher requirement is put forward on the communication reliability of the LIN bus. Dual redundancy is currently an effective means of improving the reliability of LIN bus test systems. The influence of severe working environment on the working of the LIN bus can be satisfied.
The dual redundancy technique has two modes: hot redundancy and cold redundancy. The hot redundancy is to repeatedly configure key equipment on a double or triple principle, the equipment is in a working operation state at the same time, if one equipment fails in the working process, the equipment can automatically break away from the system, and the normal operation of the system is not influenced. The cold redundancy mode is that one device is put into operation, the other redundancy device is in a hot standby state but not put into operation, and once the online operation device fails, the backup device is immediately put into operation. The common redundant systems can be divided into 3 types of parallel systems, standby systems and voting systems according to the structures of the redundant systems. The simplest redundant design is a parallel arrangement, other methods are a series-parallel or parallel-series hybrid arrangement and a majority voting arrangement, etc. However, the existing LIN bus communication has the problem of low communication reliability, and in order to solve the problem, a dual-redundancy LIN bus communication device is designed by combining a dual-redundancy technology with the existing LIN bus communication device.
Disclosure of Invention
It is an object of the present invention to provide a dual-redundant LIN bus communication device that solves the problems set forth in the background above.
In order to achieve the purpose, the invention provides the following technical scheme: a dual-redundancy LIN bus communication device comprises a hardware device and a software system, wherein the hardware device comprises an LIN Master node device, a Master LIN Slave node device, a Slave LIN Slave node device and a redundancy verification device, the LIN Master node device is connected with the Master LIN Slave node device and the Slave LIN Slave node device in parallel through bus cables, a bus transceiver and a bus controller are arranged in the LIN Master node device, and a microcontroller and an LIN transceiver are arranged in the Master LIN Slave node device and the Slave LIN Slave node device;
the software system comprises an LIN driver module and a driving redundancy module, wherein the LIN driver module carries out the same initialization operation on a microcontroller and an LIN transceiver in a Master LIN Slave node module and a Slave LIN Slave node module, the driving redundancy module changes the node states of the LIN Master node module, the Master LIN Slave node module and the Slave LIN Slave node module, the automatic fault detection and the automatic communication switching between the bus transceiver and the LIN transceiver are realized, and a receiving redundancy module and a sending redundancy module are arranged in the driving redundancy module.
Preferably, the bus controller and the microcontroller adopt NXP skeann 642 as a main control chip, the bus transceiver and the LIN transceiver adopt TJA1027 of NXP, the transceivers support LIN2.0 and above protocols, the bus transceiver adopts a Master mode of the TJA1027 of NXP, and the LIN transceiver adopts a Slave mode of the TJA1027 of NXP, so that comprehensive redundancy of transmission hardware, a physical layer, a data link layer and an application layer is realized.
Preferably, the LIN Master node device, the Master LIN Slave node device and the Slave LIN Slave node device operate in a hot backup mode.
Preferably, the initialization operation of the LIN driver module includes the selection of single and multiple frames of the microcontroller and LIN transceiver, the setting of baud rate and clock parameters.
Preferably, the receiving redundancy module is used to detect the on-off state of two LIN transceivers, which requires that the two LIN transceivers are in a receiving state, in which case the following situations occur: (1) the whole device system normally works, and at this time, both LIN transceivers receive data, and at the moment, the data in the main LIN Slave node device is only needed to be acquired; (2) the method comprises the following steps that a master LIN Slave node device does not receive data, a Slave LIN Slave node device can normally receive the data, and a status register of a microcontroller of the master LIN Slave node device does not have an error mark, wherein the situation is caused by disconnection of a connecting line of the master LIN Slave node device; (3) the main LIN Slave node device can receive data, but a status register in a microcontroller of the main LIN Slave node device has an error flag, which is caused by data error on a line, at this time, the data in the main LIN Slave node device is error data and cannot be used, so channel switching is performed, the Slave LIN Slave node device is set as a working channel, the data is taken out from the working channel and sent to a bus system, and the main LIN Slave node device is enabled to work in a receiving state after being reset and used as a standby channel.
Preferably, the transmitting redundancy module operates when the two LIN transceivers are in a transmitting state, and at this time, an open-end condition of a connection line of the main LIN Slave node device occurs, and a status register of a microcontroller in the main LIN Slave node device has a position error flag, and the following conditions may occur: (1) the whole device system normally works, only the master LIN Slave node device transmits data, and the Slave LIN Slave node device is in a reset state or a monitoring state and is ready to work at any time; (2) when the error flag of the status register of the microcontroller in the master LIN Slave node device is set, the master device cannot normally transmit, the master LIN Slave node device is reset in response to channel switching, and information retransmission data is performed on the Slave LIN Slave node device.
Preferably, the redundancy verification device is connected to the communication channels of the master LIN Slave node device and the Slave LIN Slave node device respectively by using a dual-channel LIN analyzer, and in the process of continuously transmitting data to the analyzer from the master LIN Slave node device, the link is manually disconnected, so that the standby Slave LIN Slave node device starts to work, the switching is successful, and the installed dual-redundancy LIN bus communication device can be ensured to stably and accurately operate.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, two sets of LIN equipment are arranged on a hardware device, and each set of equipment comprises an independent bus cable, a microcontroller and an LIN transceiver, so that the comprehensive redundancy of a transmission hardware, a physical layer, a data link layer and an application layer is realized, and an LIN Master node device, a Master LIN Slave node device and a Slave LIN Slave node device run in a hot backup mode, so that the normal communication of the whole system is ensured; by arranging the receiving redundancy module and the sending redundancy module in the software system, the main LIN Slave node device and the Slave LIN Slave node device can respectively and independently detect the fault of the channels thereof and automatically switch the communication channels, so that the whole device is more stable in operation; by arranging the redundancy verification device, the installed dual-redundancy LIN bus communication device can be ensured to stably and accurately operate, and the communication reliability of the LIN bus communication device is greatly improved by the design of the hardware and the software.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a data receiving process according to the present invention;
fig. 3 is a schematic diagram of a data transmission process according to 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.
Referring to fig. 1-3, the present invention provides a technical solution: a dual-redundancy LIN bus communication device comprises a hardware device and a software system, wherein the hardware device comprises an LIN Master node device, a Master LIN Slave node device, a Slave LIN Slave node device and a redundancy verification device, the LIN Master node device is connected with the Master LIN Slave node device and the Slave LIN Slave node device in parallel through a bus cable, a bus transceiver and a bus controller are arranged in the LIN Master node device, and a microcontroller and an LIN transceiver are arranged in the Master LIN Slave node device and the Slave LIN Slave node device;
the software system comprises an LIN driver module and a driving redundancy module, wherein the LIN driver module carries out the same initialization operation on a microcontroller and an LIN transceiver in a Master LIN Slave node module and a Slave LIN Slave node module, the driving redundancy module changes the node states of the LIN Master node module, the Master LIN Slave node module and the Slave LIN Slave node module, the automatic fault detection and the automatic communication switching between the Master LIN transceiver and the LIN transceiver are realized, and a receiving redundancy module and a sending redundancy module are arranged in the driving redundancy module.
Furthermore, the bus controller and the microcontroller adopt NXP SKEAZN642 as a main control chip, the bus transceiver and the LIN transceiver adopt TJA1027 of NXP, the transceivers support LIN2.0 and above protocols, the bus transceiver adopts a Master mode of the TJA1027 of NXP, and the LIN transceiver adopts a Slave mode of the TJA1027 of NXP, so that the comprehensive redundancy of transmission hardware, a physical layer, a data link layer and an application layer is realized.
Further, the LIN Master node device, the Master LIN Slave node device and the Slave LIN Slave node device are operated in a hot backup mode.
Further, the initialization operation of the LIN driver module involves the selection of single and multiple frames of the microcontroller and LIN transceiver, the setting of baud rate and clock parameters.
Further, the receiving redundancy module is used to detect the on-off state of two LIN transceivers, which requires that the two LIN transceivers are in a receiving state, and the following situations may occur: (1) the whole device system normally works, and at this time, both LIN transceivers receive data, and at the moment, the data in the main LIN Slave node device is only needed to be acquired; (2) the method comprises the following steps that a master LIN Slave node device does not receive data, a Slave LIN Slave node device can normally receive the data, and a status register of a microcontroller of the master LIN Slave node device does not have an error mark, wherein the situation is caused by disconnection of a connecting line of the master LIN Slave node device; (3) the main LIN Slave node device can receive data, but a status register in a microcontroller of the main LIN Slave node device has an error flag, which is caused by data error on a line, at this time, the data in the main LIN Slave node device is error data and cannot be used, so channel switching is performed, the Slave LIN Slave node device is set as a working channel, the data is taken out from the working channel and sent to a bus system, and the main LIN Slave node device is enabled to work in a receiving state after being reset and used as a standby channel.
Further, when the transmitting redundant module operates in a transmitting state in which the two LIN transceivers are in a transmitting state, and at this time, an open state of a connection line of the main LIN Slave node device occurs, a status register of a microcontroller in the main LIN Slave node device has a position error flag, and the following situations may occur: (1) the whole device system normally works, only the master LIN Slave node device transmits data, and the Slave LIN Slave node device is in a reset state or a monitoring state and is ready to work at any time; (2) when the error flag of the status register of the microcontroller in the master LIN Slave node device is set, the master device cannot normally transmit, the master LIN Slave node device is reset in response to channel switching, and information retransmission data is performed on the Slave LIN Slave node device.
Further, the redundancy verification device adopts a dual-channel LIN analyzer to be respectively connected with communication channels of the master LIN Slave node device and the Slave LIN Slave node device, and in the process of continuously transmitting data to the analyzer from the master LIN Slave node device, the link is manually disconnected, so that the standby Slave LIN Slave node device starts to work, the switching is successful, and the installed dual-redundancy LIN bus communication device can stably and accurately operate.
According to the invention, two sets of LIN equipment are arranged on a hardware device, and each set of equipment comprises an independent bus cable, a microcontroller and an LIN transceiver, so that the comprehensive redundancy of a transmission hardware, a physical layer, a data link layer and an application layer is realized, and an LIN Master node device, a Master LIN Slave node device and a Slave LIN Slave node device run in a hot backup mode, so that the normal communication of the whole system is ensured; by arranging the receiving redundancy module and the sending redundancy module in the software system, the main LIN Slave node device and the Slave LIN Slave node device can respectively and independently detect the fault of the channels thereof and automatically switch the communication channels, so that the whole device is more stable in operation; by arranging the redundancy verification device, the installed dual-redundancy LIN bus communication device can be ensured to stably and accurately operate, and the communication reliability of the LIN bus communication device is greatly improved by the design of the hardware and the software.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A dual-redundant LIN bus communication device comprising hardware means and a software system, wherein: the hardware device comprises an LIN Master node device, a Master LIN Slave node device, a Slave LIN Slave node device and a redundancy verification device, wherein the LIN Master node device is connected with the Master LIN Slave node device and the Slave LIN Slave node device in a parallel mode through a bus cable, a bus transceiver and a bus controller are arranged in the LIN Master node device, and a microcontroller and an LIN transceiver are arranged in the Master LIN Slave node device and the Slave LIN Slave node device;
the software system comprises an LIN driver module and a driving redundancy module, wherein the LIN driver module carries out the same initialization operation on a microcontroller and an LIN transceiver in a Master LIN Slave node module and a Slave LIN Slave node module, the driving redundancy module changes the node states of the LIN Master node module, the Master LIN Slave node module and the Slave LIN Slave node module, the automatic fault detection and the automatic communication switching between the bus transceiver and the LIN transceiver are realized, and a receiving redundancy module and a sending redundancy module are arranged in the driving redundancy module.
2. A dual-redundant LIN bus communication device of claim 1, wherein: the bus controller and the microcontroller adopt NXP SKEAZN642 as a main control chip, the bus transceiver and the LIN transceiver adopt TJA1027 of NXP, the transceiver supports LIN2.0 and above protocols, the bus transceiver adopts a Master mode of the TJA1027 of NXP, and the LIN transceiver adopts a Slave mode of the TJA1027 of NXP.
3. A dual-redundant LIN bus communication device of claim 1, wherein: and the LIN Master node device, the Master LIN Slave node device and the Slave LIN Slave node device operate in a hot backup mode.
4. A dual-redundant LIN bus communication device of claim 1, wherein: the initialization operation of the LIN driver module includes the selection of single and multiple frames of the microcontroller and LIN transceiver, the setting of baud rate and clock parameters.
5. A dual-redundant LIN bus communication device of claim 1, wherein: the receiving redundancy module is used for detecting the on-off states of the two LIN transceivers, the two LIN transceivers are required to be in receiving states at the moment, and the following conditions occur during the operation of the system: (1) the whole device system works normally, the two LIN transceivers receive data, and the data in the main LIN Slave node device is selected at the moment; (2) the main LIN Slave node device does not receive data, the Slave LIN Slave node device can normally receive the data, and a status register of a microcontroller of the main LIN Slave node device does not have an error mark, which is caused by disconnection of a connecting line of the main LIN Slave node device, at the moment, channel switching is carried out, the main LIN Slave node device is set as a standby channel, the Slave LIN Slave node device is set as a working channel, and the data are taken out from the working channel and sent to a bus system; (3) the main LIN Slave node device can receive data, but a status register in a microcontroller of the main LIN Slave node device has an error flag, so that the data in the main LIN Slave node device is error data and cannot be used due to data error on a line, so that channel switching is performed, the Slave LIN Slave node device is set as a working channel, the data is taken out of the working channel and sent to a bus system, and the main LIN Slave node device is enabled to work in a receiving state after being reset and used as a standby channel.
6. A dual-redundant LIN bus communication device of claim 1, wherein: when the two LIN transceivers of the transmission redundancy module are in a transmission state, the connection line end of the main LIN Slave node device is opened, and the status register of the microcontroller in the main LIN Slave node device has a position error flag, the following situations can occur: (1) the whole device system normally works, only the master LIN Slave node device transmits data, and the Slave LIN Slave node device is in a reset state or a monitoring state and is ready to work at any time; (2) when the error flag of the status register of the microcontroller in the master LIN Slave node device is set, the master device cannot normally transmit, the master LIN Slave node device is reset in response to channel switching, and information retransmission data is performed on the Slave LIN Slave node device.
7. A dual-redundant LIN bus communication device of claim 1, wherein: the redundancy verification device is connected with the communication channels of the master LIN Slave node device and the Slave LIN Slave node device respectively by adopting a dual-channel LIN analyzer, and when the link is manually disconnected in the process of continuously transmitting data to the analyzer from the master LIN Slave node device, the standby Slave LIN Slave node device starts to work and the switching is successful.
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Inventor after: Zhou Xingjun Inventor after: Peng Xiongfei Inventor before: Zhou Xingjun |