RU95205U1 - DISTRIBUTED NETWORK MANAGEMENT SYSTEM - Google Patents

Abstract

 A distributed network control system containing nodes connected by a communication channel, each of which consists of a node control unit control controller, a communication controller connected to a communication channel, the node control unit control controller input through the first communication unit is connected to the protection unit, to which through the second block a communication controller is connected, characterized in that each node of the system is equipped with a register mask for confirmation of transmitted messages, reg a mask of received messages and a logic unit, and the masks registers of transmitted and received messages with inputs connected to the outputs of the second communication unit and the protection unit, and outputs - with the first and second inputs of the logic unit, the third input of which is connected to the output of the control controller of the actuator unit, and the output of the logic unit is connected to the synchronizing input of the node's actuator.

Description

The utility model relates to the field of distributed network control systems for the operation of machine units and mechanisms, distributed information systems that are in a single operation cycle and can be used to synchronize the operation of actuators of machine units and mechanisms, information system modules, controlled from different nodes of the network system.

In modern technical systems, to ensure their functioning very often the task is to tightly synchronize the operation of their actuators. This problem is typical, for example, for distributed communication systems, including with a large number of subscribers, often located at a considerable distance from each other, for complex technical devices used in the automotive, aviation and other industries, for example, in control systems for the mechanization of automobile or aircraft engines. During the functioning of such systems, it is unacceptable for their actuators to receive uncoordinated, not synchronized control commands, and a violation of the synchronization of commands to the actuators can lead to a malfunction of the system or an emergency.

The problem of synchronizing the operation of actuators is carried out in various ways.

Thus, an electronic ignition synchronization system for an internal combustion engine is known, comprising an engine gear tooth position sensor for generating a signal with each gear tooth passing through said sensor, an engine phase sensor for generating an engine phase signal with each engine operation cycle, a reference generating means a cycle signal for each individual cylinder of the engine to provide synchronization generated by a high-resolution signal minute and phase of engine operation signal so that a predetermined amount of said engine rotation signal pulses for one cycle of operation of the engine in accordance with engine phase signal is divided into N equal intervals of synchronization for each cylinder, each synchronization interval is marked by the reference marker cylinders cycle. The system comprises means for controlling the synchronization of the combustion process in the respective engine cylinders, in accordance with the aforementioned engine rotation signal, the engine phase signal and reference markers of the cylinder cycle, with the ability to precisely control the specified synchronization of the combustion process. To match the specified operating position of the engine, the electronic ignition synchronization system further comprises means for multiplying the signal on the position of the gear teeth by an integer multiple of the number of cylinders in the engine, to obtain an engine rotation resolution signal in the form of a sequence of pulses, each of which in this sequence indicates in advance a certain angular displacement of the engine, while the means for controlling the synchronization of the combustion process contains a number of programmable syn chronometers providing a programmable delay, determined by the number of pulses of the mentioned engine rotation signals supplied to the synchronizers from the signal multiplier to control the synchronizing action for each cylinder using reference markers of the cylinder cycle as reference clock pulses. The system also includes N programmable delay synchronizers before the injector is turned on, each of which provides a programmable delay indicating the moment in the cylinder cycle, determined in accordance with the angular displacement of the engine, at which the corresponding fuel injector must open to supply fuel to this cylinder, and the means for control the synchronization of the combustion process further comprises means for setting the sequence of cylinders for the formation of synchronizing control signal c to indicate the individual cycle periods for each engine cylinder in the exact sequence in accordance with the engine phase signal and the reference marks of the cylinder cycle.

(see RF patent No. 2121073, class F02P 5/15, 1998)

As a result of the implementation of this synchronization system, it should be noted that it is extremely complex, processes a large number of parameters, which reduces its speed and reliability. Its scope is limited to internal combustion engines.

A known system for synchronizing nodes of a distributed control system in which the master node of the system sends a series of synchronizing messages to the slave nodes, according to which they configure their internal timers.

(see US patent No. 7114091, CL G06F 1/12, 2006)

The disadvantage of this system is its lack of speed and low accuracy of synchronization, limited by a sufficiently long time for transmission of synchronizing messages over a network channel.

A distributed control system is known comprising network nodes connected by a communication channel, each of which consists of a node controller controlling an actuator, a controller connected to a communication channel, the output of this controller through a communication unit connected to a protection unit, the output of which through a second communication unit is connected to host controller input. The protection unit and the first communication unit are additionally connected to the actuator.

During the operation of the system, in the absence of failures, the network nodes exchange messages through the communication channel through the communication channel, and the node controllers perform the functions of controlling actuating devices. In the event of a node controller failure in one of the network nodes, other network nodes detect a failure and, by sending alarm messages, transfer the node actuator with the failed controller to a safe state for the entire system. The alarm message is recognized by the communication unit and the protection unit and acts on the actuator, bypassing the failed controller.

(see US patent No. 7023870, IPC H04L 12/56 2006) is the closest analogue.

As a result of the analysis of this system, it should be noted that its drawback is the lack of a mechanism for tight synchronization of the operation of executive devices in network nodes. The moment of issuing the control action by the node controller to the actuator in each node is determined in accordance with the logic of this node and is not tied to the moments of issuing control actions in other nodes. Given that some of the nodes may be in failure or reboot states, the difference in the times of issuing control actions in different nodes can reach significant values.

The objective of this utility model is to develop a distributed network management system that provides tight synchronization of the actuators in different nodes of this system.

The task is ensured by the fact that in a distributed network control system containing nodes connected by a communication channel, each of which consists of a controller for controlling the actuator of the node, a communication controller associated with the communication channel, the input of the controller for controlling the actuator of the node through the first communication unit is connected to the protection unit , with which the communication controller is connected through the second communication unit, the new fact is that each node of the system is equipped with a register m confirmation of transmitted messages by the register mask of received messages and the logic block, and the register of masks of transmitted and received messages with inputs connected to the outputs of the second communication unit and the protection unit, and outputs with the first and second inputs of the logic unit, the third input of which is connected to the output of the control controller the actuator of the node, and the output of the logic unit is connected with the synchronizing input of the actuator of the node.

The essence of the utility model is illustrated by graphic materials on which a diagram of a distributed network management system is presented.

The system consists of n network nodes U1, U2 ... Un (for example, machine units operating in a single technological cycle), the work of which should be carried out in a rigidly tied cycle. Each network node consists of an executive device operation control controller 1, a communication controller 2, a protection unit 3 connected through a first communication unit 4 to a controller 1 and through a second communication unit 5 to a communication controller 2. An executive device is indicated by 6. All network nodes are connected into a single system through a communication channel 7. Each network node additionally contains a register 8 of a mask for acknowledging transmitted messages, a register 9 of a mask for received messages and a logic unit 10. Registers Asos transmitted 8 and received 9 messages with their inputs are connected to the outputs of the protection units 3 and communication 5, and their outputs are connected with the first and second inputs of the logic unit 10, the third input of the logic unit 10 is connected to the output of the controller 1. The output of the logic unit 10 is connected to the synchronizing input actuator 6.

Structurally, the system is implemented on the basis of well-known tools.

As controllers, Elvis MC-24, Atmel AT91SAM9 processors or other embedded microcontrollers can be used.

As communication blocks, SPI, RS-485 interfaces or other serial or parallel buses can be used.

A Xilinx or Altera programmable logic integrated circuit may be used as a protection unit and registers.

As a logic unit, a standard logical integrated circuit can be used.

The system operates as follows.

During the operation of the system, each controller 1 sets its own logic block 10 to generate synchronization commands for the actuator 6 in such a way that the synchronization command will be issued by the logic block 10 only if the specified masks received and received messages from registers 8 and 9 receive. In the process of the system’s operation, the controller 1 issues a control command to the actuator 6 and simultaneously sends a message to all network nodes about the issuance of a command to its actuator 6 through the communication controller 2. The actuator does not immediately execute the issued command, but only when a synchronization signal comes from the logic unit 10, and the logic block will issue a synchronization signal only when all the node controllers issue control commands to their actuators and issue communications onny channel corresponding messages. At each network node, protection and communication units 3 and 5 process all received and transmitted messages and set the bits corresponding to the messages in registers 8 and 9, which are processed by logic unit 10. If the combination of bits corresponding to the transmitted and received messages coincides with the set of bits set in the logic block when the system starts, the logic block issues a synchronization signal to its actuator. Thus, the logic blocks of all network nodes will issue synchronization commands for their actuators strictly at the time of receipt of a message from the last-time controller of the node that issued the command to its control device. Thus, the synchronization signals of the actuators will be issued to all actuators simultaneously up to the speed of the logic blocks.

Claims (1)

A distributed network control system containing nodes connected by a communication channel, each of which consists of a node control unit control controller, a communication controller connected to a communication channel, the node control unit control controller input through the first communication unit is connected to the protection unit, to which through the second block a communication controller is connected, characterized in that each node of the system is equipped with a register mask for confirmation of transmitted messages, reg a mask of received messages and a logic unit, and the masks registers of transmitted and received messages with inputs connected to the outputs of the second communication unit and the protection unit, and outputs - with the first and second inputs of the logic unit, the third input of which is connected to the output of the control controller of the actuator unit, and the output of the logic unit is connected to the synchronizing input of the node's actuator.