CN107181654B - CAN communication method and system for controlling local area network and air conditioning system - Google Patents

CAN communication method and system for controlling local area network and air conditioning system Download PDF

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Publication number
CN107181654B
CN107181654B CN201710527812.5A CN201710527812A CN107181654B CN 107181654 B CN107181654 B CN 107181654B CN 201710527812 A CN201710527812 A CN 201710527812A CN 107181654 B CN107181654 B CN 107181654B
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bus
node
nodes
polarity
communication
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CN107181654A (en
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李翠娟
玉维友
刘桂鹏
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • 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]
    • H04L12/2803—Home automation networks
    • 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
    • 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]
    • H04L12/2803—Home automation networks
    • H04L2012/2847—Home automation networks characterised by the type of home appliance used
    • H04L2012/285—Generic home appliances, e.g. refrigerators
    • 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
    • H04L2012/40215—Controller Area Network CAN
    • 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
    • H04L2012/40247—LON

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Automation & Control Theory (AREA)
  • Selective Calling Equipment (AREA)

Abstract

The invention discloses a CAN communication method and system for controlling a local area network and an air conditioning system. Wherein, this CAN communication system includes: a CAN bus; and the plurality of nodes are accessed to the CAN bus, and the polarity of the nodes meeting the preset condition in the plurality of nodes is taken as the main polarity of the CAN bus, wherein after the main polarity of the CAN bus is determined, the nodes except the nodes meeting the preset condition in the plurality of nodes follow the main polarity of the CAN bus. The invention solves the technical problem of complex circuit of the non-polar CAN communication system in the related technology.

Description

CAN communication method and system for controlling local area network and air conditioning system
Technical Field
The invention relates to the field of non-polar communication of a Control Area Network (CAN), in particular to a CAN communication method and system of the CAN and an air conditioning system.
Background
The currently adopted implementation scheme of the non-polar CAN circuit generally has two modes, one is that a Central Processing Unit (CPU for short) controls the power supply of a CAN transceiver of each node in a CAN communication network, so that the effect of switching the communication direction (polarity) of each node is realized; the other is to switch the communication direction of each node by setting a peripheral circuit capable of switching the communication direction and controlling the peripheral circuit by a CPU, for example, a relay may be set in the peripheral circuit of each node, the switching state of the relay may switch the communication direction of the corresponding node, and the CPU controls the state of the relay to realize the effect of switching the polarity of the node. However, the above technical solutions all need to be controlled by a CPU, or a peripheral circuit is also needed to control the communication polarity of the CAN, which results in a complex circuit and higher cost.
Aiming at the technical problem of complex circuit of a non-polar CAN communication system in the related technology, no effective solution is provided at present.
Disclosure of Invention
The embodiment of the invention provides a method and a system for controlling local area network (CAN) communication and an air conditioning system, which at least solve the technical problem of complicated circuit of a non-polar CAN communication system in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a CAN communication system for a control area network, the system including: a CAN bus; and the plurality of nodes are accessed to the CAN bus, and the polarity of the nodes meeting the preset condition in the plurality of nodes is taken as the main polarity of the CAN bus, wherein after the main polarity of the CAN bus is determined, the nodes except the nodes meeting the preset condition in the plurality of nodes follow the main polarity of the CAN bus.
Further, a node meeting the preset condition among the plurality of nodes is a node which starts communication first among the plurality of nodes.
Further, a designated node in the plurality of nodes is used for obtaining the own delay time after power-on, wherein the delay time is the delay of starting communication of the corresponding node, and the node which starts communication first is the node with the shortest delay time in the designated node.
Further, the node which starts communication first is the node which does not sense the existence of the communication data on the CAN bus within a first preset time after power-on, and does not sense the existence of the communication data on the CAN bus within a second preset time after switching the polarity of the node.
Further, the node which starts communication first is used to determine the dominant polarity of the CAN bus by sending communication data to the CAN bus.
Further, the nodes except the node which starts communication first in the plurality of nodes are used for switching the polarity of the nodes under the condition that the communication data exist on the CAN bus is not intercepted, and the polarity of the nodes is not switched under the condition that the communication data exist on the CAN bus is intercepted.
According to another aspect of an embodiment of the present invention, there is also provided an air conditioning system including: a CAN bus; the inner machine node is connected to the CAN bus; and the external machine node is connected to the CAN bus, and the polarity of the node meeting the preset condition in the external machine node is used as the main polarity of the CAN bus, wherein after the main polarity of the CAN bus is determined, the node not meeting the preset condition in the external machine node and the internal machine node follow the main polarity of the CAN bus.
According to another aspect of the embodiments of the present invention, there is also provided a method for controlling a local area network CAN communication, the method including: judging whether each node in a plurality of nodes accessed to the CAN bus meets a preset condition or not; taking the polarity of the nodes meeting the preset conditions as the main polarity of the CAN bus; after determining the dominant polarity of the CAN bus, determining that a node of the plurality of nodes that is different from the polarity of the CAN bus follows the dominant polarity of the CAN bus.
Further, judging whether each node of the plurality of nodes accessing the CAN bus meets the preset condition includes: and determining the node which firstly starts communication on the CAN bus and taking the node as the node which meets the preset condition.
According to another aspect of the embodiments of the present invention, there is also provided a storage medium including a stored program, wherein when the program is executed, a device in which the storage medium is located is controlled to perform the CAN communication method of the present invention.
In the embodiment of the invention, the polarity of the node meeting the preset condition in the plurality of nodes is taken as the main polarity of the CAN bus through the plurality of nodes accessed to the CAN bus, wherein after the main polarity of the CAN bus is determined, the nodes except the node meeting the preset condition in the plurality of nodes follow the main polarity of the CAN bus, so that the technical problem of complicated circuit of a non-polar CAN communication system in the related technology is solved, and the technical effect of simplifying the circuit of non-polar CAN communication is further realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of an alternative CAN communication system in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a communication principle of an alternative CAN communication system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an alternative air conditioning system according to an embodiment of the present invention;
fig. 4 is a flowchart of an alternative method for controlling lan CAN communication according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The application provides an embodiment of a CAN communication system for controlling a local area network.
Fig. 1 is a schematic diagram of an alternative CAN communication system according to an embodiment of the present invention.
The system includes a CAN bus 10 and a plurality of nodes, which in the embodiment shown in fig. 1 include node 21, node 22 and node 23. Each node may be an electronic device, such as an air conditioner (an air conditioner external unit or an air conditioner internal unit).
The CAN bus is provided with two lines, and a voltage difference value between the two lines is communication data, so that in the prior art, the CAN bus has polarity, two connection modes are provided between each node and the CAN bus, one connection mode is correct polarity, the other connection mode is wrong polarity, and each node needs to distinguish the polarity when being connected to the CAN bus and is connected through the correct polarity. The CAN communication system for the control area network provided by the embodiment of the invention does not need to distinguish polarities, a plurality of nodes CAN be accessed to the CAN bus in any connection mode, and the communication line of each node CAN be connected to the CAN bus at will.
Specifically, a plurality of nodes in the CAN communication system are connected to the CAN bus, and the polarity of a node meeting a preset condition in the plurality of nodes is used as the main polarity of the CAN bus, wherein after the main polarity of the CAN bus is determined, the nodes except the node meeting the preset condition in the plurality of nodes follow the main polarity of the CAN bus. It should be noted that each node may perform the operation of switching its own polarity through the CAN transceiver chip.
As an alternative embodiment, the node meeting the predetermined condition in the plurality of nodes is the node which starts communication first in the plurality of nodes. The communication is started by starting data interaction with the CAN bus, and the data interaction CAN be data receiving (bus listening) or data sending (bus broadcasting).
As an optional embodiment, a designated node in the plurality of nodes is configured to obtain its own delay time after power-on, where the delay time is a delay for the corresponding node to start communication, and a node which starts communication first is a node with the shortest delay time in the designated node. The method for obtaining the delay time may store a value of the delay time in each node in advance, or determine the value of the delay time through an algorithm for calculating a random number, which is not specifically limited in the embodiment of the present invention. It should be noted that, in this optional embodiment, the multiple nodes may be divided into two types of nodes, a designated node and a non-designated node, where the designated node needs to acquire the delay time, and the non-designated node does not need to acquire the delay time.
As an alternative embodiment, the node which starts communication first is the node which does not sense the existence of the communication data on the CAN bus within a first preset time after power-on, and does not sense the existence of the communication data on the CAN bus within a second preset time after switching the polarity of the node.
As an alternative embodiment, the node which first starts communication is used to determine the dominant polarity of the CAN bus by sending communication data to the CAN bus. After the communication data is sent, the communication data exists on the CAN bus, and other nodes (namely nodes which do not meet the preset condition) except the node which starts to communicate firstly determine the main polarity of the CAN bus by intercepting whether the communication data exists on the CAN bus. If the communication data are sensed, the polarity of the CAN bus is the same as the main polarity of the CAN bus, the polarity of the CAN bus is not switched, if the communication data are not sensed, the polarity of the CAN bus is different from the main polarity of the CAN bus, and the polarity of the CAN bus is switched to sense again.
As an alternative embodiment, the nodes except the node which starts communication first in the plurality of nodes are configured to switch their own polarity when the communication data on the CAN bus is not sensed, and to not switch their own polarity when the communication data on the CAN bus is sensed.
The CAN communication system provided by the embodiment solves the technical problem that a circuit of a non-polar CAN communication system in the related technology is complex, and further realizes the technical effect of simplifying the circuit of the non-polar CAN communication. Compared with the prior art that the polarity switching of the communication circuit is controlled by the peripheral circuit through the IO port of the CPU, the CAN communication system provided by the embodiment of the invention omits an external communication polarity switching circuit, CAN simplify a CAN non-polarity circuit, reduces the area of a PCB and reduces the cost.
The communication principle of the CAN communication system for controlling the local area network according to the embodiment will be described with reference to a specific application scenario.
As shown in fig. 2, in the CAN communication system in this application scenario, a plurality of network nodes (nodes) are connected to a CAN bus, including an external node and an internal node, and communication connections between the nodes may be connected at will by engineering installation personnel without distinguishing polarities. The time for the nodes on the bus to start communication is divided in sequence, and after the CAN communication system is powered on, each node monitors whether communication data exist on the CAN bus or not. It should be noted that the external node does not start communication immediately, but obtains a value through a simple algorithm, where the value is a delay time from power-on of the CPU of the node to communication start, and after the delay time is reached, starts communication, that is, starts to listen to communication data on the CAN bus, and if no communication data exists on the bus under both polarities, broadcasts the communication data through the CAN bus, that is, determines the communication polarity (main polarity) of the CAN bus. The interior machine node needs outer quick-witted node roll call after the communication, therefore, the outer quick-witted node that the delay time is the shortest, the polarity that also begins the outer quick-witted node of communication on the CAN bus first is the communication owner polarity of entire system (the polarity of CAN bus), and other nodes on the communication system are after beginning the communication, CAN listen the communication condition on the bus earlier, if there is communication data on listening the bus, then do not switch over self polarity, if do not listen to and have communication data on the bus, then CAN switch self polarity and listen whether there is communication data on the bus according to the predetermined time interval, stop switching self polarity after listening communication data.
The present application further provides an embodiment of an air conditioning system.
Fig. 3 is a schematic diagram of an alternative air conditioning system according to an embodiment of the present invention, as shown in fig. 3, the air conditioning system includes at least one outdoor unit 201, an outdoor unit 202, an indoor unit 301, and an indoor unit 302, as shown in fig. 3.
It should be noted that each of the external units and the internal units is connected to a CAN bus 10 of the CAN communication system, each of the external units and each of the internal units are respectively used as a node connected to the CAN bus 10, each of the external units is an external unit node connected to the CAN bus, and each of the internal units is an internal unit node connected to the CAN bus.
The air conditioning system provided by this embodiment takes the polarity of the node that meets the preset condition in the outer machine node as the main polarity of the CAN bus, wherein after the main polarity of the CAN bus is determined, the node that does not meet the preset condition in the outer machine node and the inner machine node follow the main polarity of the CAN bus.
In the air conditioning system provided in this embodiment, each external unit may first send roll call data through the CAN bus 10, where the roll call data is used to roll call the internal unit, and the internal unit replies after receiving the roll call data, so that the speed at which the internal unit starts to communicate is slower than that of the external unit. Therefore, after each external machine node is powered on, the delay time of communication CAN be calculated through an algorithm, the polarity of the external machine with the shortest delay time is taken as the main polarity of the communication of the CAN bus 10, the node on the internal machine side does not need to execute the algorithm, and the algorithm only needs to be executed on the external machine side. After the polarity of the external machine node with the shortest delay time is taken as the main polarity of the communication of the CAN bus 10, other external machine nodes and internal machine nodes follow the polarity of the external machine node with the shortest delay time by monitoring the communication data on the CAN bus 10. In a single machine system, only one external machine exists, so that the external machine node does not need to execute an algorithm for calculating delay time, and only needs the internal machine to directly follow the communication polarity of the external machine.
The application also provides an embodiment of a CAN communication method for controlling the local area network.
Fig. 4 is a flowchart of an alternative method for controlling local area network CAN communication according to an embodiment of the present invention, as shown in fig. 4, the method includes the following steps:
step S401, judging whether each node in a plurality of nodes accessed to a CAN bus meets a preset condition;
step S402, taking the polarity of the node meeting the preset condition as the main polarity of the CAN bus;
in step S403, after determining the dominant polarity of the CAN bus, it is determined that a node of the plurality of nodes having a polarity different from that of the CAN bus follows the dominant polarity of the CAN bus.
Optionally, the determining whether each node of the plurality of nodes accessing the CAN bus meets the preset condition includes: and determining the node which firstly starts communication on the CAN bus and taking the node as the node which meets the preset condition.
The application also provides an embodiment of a storage medium, which comprises a stored program, wherein when the program runs, the device where the storage medium is located is controlled to execute the CAN communication method.
The order of the embodiments of the present application described above does not represent the merits of the embodiments.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways.
In addition, functional circuits in the embodiments of the present application may be integrated into one circuit, each circuit may exist alone physically, or two or more circuits may be integrated into one circuit. The functions of the above circuits may be implemented in the form of hardware, or may be implemented in the form of software functional units loaded on hardware.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims (7)

1. A CAN communication system, comprising:
a CAN bus;
the plurality of nodes are accessed to the CAN bus, and the polarity of the nodes meeting the preset condition in the plurality of nodes is taken as the main polarity of the CAN bus, wherein after the main polarity of the CAN bus is determined, the nodes except the nodes meeting the preset condition in the plurality of nodes follow the main polarity of the CAN bus;
the node meeting the preset condition in the plurality of nodes is the node which starts to communicate firstly in the plurality of nodes;
and the nodes except the node which starts communication at first in the plurality of nodes are used for switching the own polarity under the condition that the communication data exist on the CAN bus is not intercepted, and are not switched under the condition that the communication data exist on the CAN bus is intercepted.
2. The system according to claim 1, wherein a designated node among the plurality of nodes is configured to obtain its own delay time after power-on, where the delay time is a delay time when the corresponding node starts communication, and the node which starts communication first is a node among the designated nodes with the shortest delay time.
3. The system of claim 1, wherein the first node to start communication is a node that does not sense the presence of communication data on the CAN bus within a first predetermined time after power-up and does not sense the presence of communication data on the CAN bus within a second predetermined time after switching its polarity.
4. The system of claim 3 wherein the node that first begins communication is configured to determine a master polarity of the CAN bus by sending the communication data to the CAN bus.
5. An air conditioning system, comprising:
a CAN bus;
the inner machine node is connected to the CAN bus;
an external machine node which is connected to the CAN bus and takes the polarity of a node meeting preset conditions in the external machine node as the main polarity of the CAN bus,
after the main polarity of the CAN bus is determined, nodes which do not accord with the preset conditions in the external machine nodes and the internal machine nodes follow the main polarity of the CAN bus;
the node meeting the preset condition in the external machine node is the node which starts communication first in the external machine node;
and the nodes except the node which starts communication at first in the external machine node are used for switching the own polarity under the condition that the communication data exist on the CAN bus is not monitored, and the own polarity is not switched under the condition that the communication data exist on the CAN bus is monitored.
6. A CAN communication method for controlling a local area network is characterized by comprising the following steps:
judging whether each node in a plurality of nodes accessed to the CAN bus meets a preset condition or not;
taking the polarity of the node meeting the preset condition as the main polarity of the CAN bus;
after determining the master polarity of the CAN bus, determining that a node of the plurality of nodes that is different in polarity from the CAN bus follows the master polarity of the CAN bus;
judging whether each node in a plurality of nodes accessed to the CAN bus meets a preset condition comprises the following steps: determining a node which starts communication first on the CAN bus and taking the node as a node meeting the preset condition;
and the nodes except the node which starts communication at first in the plurality of nodes are used for switching the own polarity under the condition that the communication data exist on the CAN bus is not intercepted, and are not switched under the condition that the communication data exist on the CAN bus is intercepted.
7. A storage medium comprising a stored program, wherein the program, when executed, controls an apparatus in which the storage medium is located to perform the CAN communication method according to claim 6.
CN201710527812.5A 2017-06-30 2017-06-30 CAN communication method and system for controlling local area network and air conditioning system Active CN107181654B (en)

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CN108234266B (en) * 2018-01-22 2020-08-21 珠海格力电器股份有限公司 Data transmission method and device for bus type communication network and storage medium
CN110247833B (en) * 2019-05-24 2020-06-26 珠海格力电器股份有限公司 Communication control method, device, sub-equipment and communication system
CN113741687B (en) * 2021-08-10 2023-05-23 广东工业大学 Industrial air conditioner control communication method, system and storage medium based on AR (augmented reality) glasses
CN115235040B (en) * 2022-07-12 2024-07-16 珠海格力电器股份有限公司 Polarity judging method of transceiver and multi-connected air conditioner

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