KR102259503B1 - Method and system for controlling simulation based on event driven scheme - Google Patents

Abstract

The present invention provides a method for controlling simulation in real time based on an event-driven scheme. The method of the present invention comprises: a first state transition step of transmitting real-time time advance events received from a simulation control unit to a system integration laboratory (SIL) model and performing transition in the state of the SIL model over time to output a result, wherein the first state transition step is performed by a processor implemented as a simulator; a second state transition step of receiving external data events from a message exchange unit and transmitting the same to the SIL model to perform transition in the state of the SIL model; and a message transmission step of transmitting a message for a calculation result of the SIL model, which is processed through the first state transition and the second state transition. According to the present invention, provided are a method and system for controlling simulation through a simulation model for an aircraft based on discrete event system specification (DEVS) formalism.

Description

Real-time simulation control method and system based on event driven scheme {Method and system for controlling simulation based on event driven scheme}

The present invention relates to a simulation control method and apparatus. More particularly, it relates to an event-driven method-based real-time simulation control method and system.

In the conventional method of simulating the SIL model for aviation, the processing of input/output/calculation in units of small time frames may be performed sequentially and periodically.

In this regard, real-time of the system can be guaranteed by monitoring whether the periodic unit execution is completed within the unit time frame. That is, the operation of periodically reading the received data, executing (calculating) logic based on the data, and outputting the result is repeatedly performed. Accordingly, it is possible to ensure real-time performance by monitoring that the task is finished within a predetermined unit time frame.

The modeling formalism was not applied to the conventional SIL (System Integration Laboratory) model for aviation. In this regard, the aviation SIL model developed without modeling formalism has a problem in that it is difficult to standardize.

In addition, real-time monitoring of sequential processing within a periodic time frame has the following limitations.

1) By processing I/O in a polling method, system resources can be wasted.

2) Due to the periodic input/output structure according to the size of the unit time frame (normally 20 ms), it is impossible to process time more precisely than the time frame size.

3) The method of monitoring real-time performance based on the time frame implies a false positive error in the real-time determination when several models with different execution cycles are executed at the same time.

Accordingly, an object of the present invention is to provide a simulation control method and system through a simulation model for aviation based on the DEVS formalism in order to solve the above-described problems.

In addition, it is an object of the present invention to provide a method for efficiently using resources by processing I/O and model execution based on DEVS formalism and event rather than sequential and periodic execution methods.

In addition, an object of the present invention is to guarantee more precise time processing and to propose a method for achieving the same purpose (real-time simulation of a SIL model for aviation) without false positive errors of real-time monitoring.

An event driving method-based real-time simulation control method according to the present invention for solving the above problems is provided. The method is performed by a processor implemented as a simulator, and transmits a real-time time advance event received from a simulation control unit to a System Integration Laboratory (SIL) model, and the SIL model according to the passage of time a first state transition step of transitioning the state of , and outputting a result; a second state transition step of receiving an external data event from the message exchange unit and transferring the event to the SIL model to transition the state of the SIL model; and transmitting a message for a result of calculation of the SIL model processed through the first state transition and the second state transition.

In one embodiment, input data and output data of the aviation simulation model may be exchanged through the message exchange unit and the shared memory.

In an embodiment, the simulation control unit may transmit the control command to a simulation engine, and the simulation engine may process to start/stop/resume/end the aviation simulation based on the control command.

In one embodiment, the simulation engine receives the message received by the message exchange unit through the external I/0 interface, which is a hardware interface, through the message exchange unit, and the message exchange unit and the SIL model share the message through a shared memory can do.

In an embodiment, the message exchange unit may monitor an update period of an output message determined according to the specification of the SIL model.

In one embodiment, the simulation control unit activates a hardware timer and I/O when a start or resume command is input so that time advance and an external data reception event are activated, and when a stop or end command is input, the external data reception event is deactivated to stop the simulation.

In an embodiment, the SIL model may include: an atomic model including a state, a port through which an event is transmitted from a received message, an interlocking attribute associated with a shared memory, and information on state transition; a coupling model connected to a plurality of sub-models and including schedule information and port-to-port connection information for the sub-models; and a top-level coupling model connected to the atomic model and the coupling model, and including schedule information and port-to-port connection information for a sub-model corresponding to the atomic model and the coupling model.

In one embodiment, in the first state transition step, a setting related to a timer event of hardware is configured in cooperation with an operating system (OS), and when the timer event is received, the SIL model through the real-time time advance event A defined state transition task can be processed. In addition, in the second state transition step, when an external data event is received from the message exchange unit, port data associated with the external data event is transferred to the SIL model to process the state transition task defined in the SIL model in an event manner. can

A simulation control apparatus for performing a real-time simulation control method based on an event driving method according to another aspect of the present invention is provided. The simulation control device includes: a message exchange unit for transmitting and receiving messages through a hardware interface and exchanging the SIL model and the message contents; a simulation control unit configured to forward a real-time time advance event to the simulation engine and to control start/stop/resume/end of the simulation; and transferring the real-time time advance event received from the simulation control unit to a System Integration Laboratory (SIL) model, transitioning the state of the SIL model, receiving an external data event from the message exchange unit, and transferring it to the SIL model , transition the state of the SIL model, and may include a simulation engine configured to process a control command of start/stop/resume/end of the aviation simulation received from the simulation control unit.

In one embodiment, the simulation engine exchanges input data and output data of the aviation simulation model through the message exchange unit and the shared memory, the simulation control unit transmits the control command to the simulation engine, and the simulation engine Based on the control command, the flight simulation may be processed to start/stop/resume/end.

In one embodiment, the simulation engine receives the message received by the message exchange unit through the external I/0 interface, which is the hardware interface, as an event of the SIL model through the message exchange unit, and transmits the message to the model port, and transmits the message to the The simulation engine and the SIL model share the shared memory, and the message exchange unit may monitor an update cycle of an output message determined according to the specification of the SIL model.

In one embodiment, the simulation control unit configures settings related to a timer event of hardware in cooperation with an operating system (OS), and when receiving the timer event, transmits a real-time time advance event to the simulation engine to generate the SIL model. After processing the first state transition task and receiving an external data event from the message exchange unit, port data associated with the external data event may be transferred to the SIL model to process the second state transition task of the SIL model.

According to at least one embodiment of the present invention, the events of the DEVS formalism applied to the aviation simulation model are the passage of time (advance) and external input data. Therefore, with the above simulation configuration using the DEVS engine, only when an event occurs, the event is transferred into the model to execute the logic, and the inefficiency of the existing periodic repetitive work is improved.

According to at least one embodiment of the present invention, the monitoring for real-time determines whether the model updates (outputs) the output data within a predetermined update period. In this regard, the real-time guarantee of the hard real-time system can be determined by whether the calculation result is output within the deadline. That is, in the conventional method, if it is determined whether the output is calculated within a predetermined time (frame) because the entire iterative task is finished within a time frame, in the present invention, the running model keeps the required update period (period specified in the ICD) of the individual output data, and It can be determined whether

DEVS formalism, which revolves around events, is not compatible with the cyclical processing method, which is a conventional simulation method. Therefore, the present invention can provide a method of operating a SIL model with an interrupt type I/O operation suitable for event driving and a simulation engine operating based on an event, and monitoring to ensure real-time performance.

According to at least one embodiment of the present invention, the event driving method is easier to expand the system than the periodic batch processing method (scalability), and it is possible to efficiently utilize the system performance.

In the method of the present invention, the logic of the model developed with the DEVS formalism is separated from the external I/O communication of the model by the data exchange unit, so the ICD (Interface of the on-board equipment or higher system (avionics system, air vehicle system, etc.) Control Document), the reusability of model logic can be improved.

1 illustrates a case in which real-time processing failure detection occurs when performing periodic tasks for each time frame.
FIG. 2 is a diagram illustrating the calculation (C) task by dividing it into a SIL model operating in three different execution cycles.
3 illustrates a case in which a time error occurs in a Hard Real-Time system that processes tasks in sequential and periodic fashion.
4 shows a detailed configuration of a simulation control apparatus for performing a real-time simulation control method based on an event driving method according to the present invention.
5 shows the detailed configuration of the SIL model in relation to the linkage between the simulator and the SIL model according to the present invention.
6 is a flowchart of a real-time simulation control method based on an event driving method according to the present invention.

The features and effects of the present invention described above will become more apparent through the following detailed description in connection with the accompanying drawings, and accordingly, those of ordinary skill in the technical field to which the present invention pertains can easily implement the technical idea of the present invention. I will be able to.

In the present invention, various modifications may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all changes, equivalents, or substitutes included in the spirit and scope of the present invention.

In describing each drawing, similar reference numerals are used for similar elements.

Terms such as first and second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component.

For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein including technical or scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in the present application. Shouldn't.

Suffix modules, blocks, and parts for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have meanings or roles that are distinguished from each other by themselves.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. In describing the embodiments of the present invention below, when it is determined that a detailed description of a related known function or a known configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Hereinafter, an event-driven method-based real-time simulation control method and apparatus will be described. In this regard, FIGS. 1 to 3 show a time scheduling method according to time flow in a Hard Real-Time system in relation to the present invention. The T, R, and C blocks mean the occupancy time for the SIL model to transmit (T) data, receive (R) and calculate (C) data.

1 illustrates a case in which real-time processing failure detection occurs when performing periodic tasks for each time frame. Meanwhile, FIG. 2 is a diagram illustrating the calculation (C) task by dividing it into a SIL model operating in three different execution cycles. When real-time is judged based on the completion of all tasks for each time frame, it is a false positive of Frame Over Run because C3 is not finished in Frame 3 even though C2 or C3 is a model that does not need to work every unit time frame period. Indicates when an error occurs. In addition, FIG. 3 shows a case in which a time error occurs in a Hard Real-Time system that processes a job in a sequential and periodic manner. Even if a message requesting signal output is received in Frame 1, the SIL model receives it in the R block of the next frame because the R block of the corresponding frame is terminated. The time of processing (C) and outputting the signal is at the earliest in the T block of Frame 3 is done Therefore, it cannot be processed according to the precise time delay and an error more than the frame length is inevitable.

In this regard, the SIL real-time simulation system for aviation is a hard real-time system that has a fatal effect on the system if the result of the task is not obtained within the given time constraint. 1 , the simulation of the aviation SIL model may perform a periodic operation for each time frame.

Referring to FIG. 1 , a time frame may be determined and data output (T), data input (R), and calculation operations (C) may be repeatedly performed. In this case, as the time of the specific calculation task (C) increases, real-time processing failure may occur, and accordingly, a notification or system interruption may occur.

Referring to FIG. 2 , the Hard Real-Time system may contain a false positive error of Frame Over Run. In this regard, since real-time is determined on the basis of the completion of all tasks for each time frame, it is possible to determine a model with a period larger than the unit time frame on the basis of each time frame (20 ms). C1 is 20ms, C2 is 40ms, C3 is 80ms when simulating three models with an execution cycle, C3 does not have to finish all the work at the end of Frame3. Therefore, Frame Over Run in Frame 3 is a false positive error.

Meanwhile, referring to FIG. 3 , in relation to the precise output of the discrete signal, a time control error may occur. Specifically, if the requirement is output 5 ms after the signal output request reception standard, an error may occur in the polling method.

In order to solve the false positive error problem and the time control error problem, the event driving method-based real-time simulation control method according to the present invention and an apparatus for performing the same may be configured as shown in FIG. 4 . That is, FIG. 4 shows a detailed configuration of a simulation control apparatus for performing a real-time simulation control method based on an event driving method according to the present invention.

The simulation control apparatus may be implemented as a simulator 100 including a simulation control unit 110 , a simulation engine 120 , and a message exchange unit 150 . Here, the simulation engine 120 may be referred to as a Discrete Event Systems Specification (DEVS) simulation engine 120 because it performs real-time simulation based on an event based on the aviation SIL model.

On the other hand, the simulation control apparatus may further include a (aviation) SIL model 200 interlocking with the simulation engine 120 . Here, the SIL model 200 may be referred to as the SIL library 200 or the SIL model storage unit 200 . Meanwhile, the simulator 100 including the simulation control unit 110 , the simulation engine 120 , and the message exchange unit 150 according to the present invention may be driven by at least one processor. Accordingly, the real-time simulation control method based on the event driving method may be driven by at least one processor driving the simulator 100 .

On the other hand, the simulator 100 performing the real-time simulation control method based on the event driving method according to the present invention may be operated in conjunction with the real-time OS. Meanwhile, the simulator 100 performing the event driving method-based real-time simulation control method may be linked with hardware through a real-time OS.

The detailed configuration and operation of the simulator 100 for performing the real-time simulation control method based on the event driving method according to the present invention are as follows.

1) DEVS simulation engine 120 - This is the engine unit that drives the DEVS-based aviation SIL model, and transmits an event (time advance or input (port) data) to the model and transmits the output data resulting from the event execution to the data exchange unit. In the time advance, an internal state transition (first state transition) of the DEVS model occurs, and external input data causes an external state transition (second state transition) of the DEVS model.

2) Simulation control unit 110 - When a timer event of hardware is set through the OS and a timer event is received, the real-time tick of the DEVS engine is advanced. It performs the function of controlling the entire system such as start/stop of the simulation engine through operator interlocking.

3) Message exchange unit 150 - Transmits input data received from the outside through I/O to the DEVS engine, and transmits the result data of the model output from the DEVS engine to the outside through I/O. Accordingly, it is possible to monitor the real-time of the model by monitoring the update period of data for which periodic output is to be performed.

The detailed operation of the simulator 100 including the simulation control unit 110 , the simulation engine 120 , and the message exchange unit 150 for performing the event driving method-based real-time simulation control method according to the present invention is as follows. same.

The message exchange unit 150 is configured to receive a message through a hardware interface. On the other hand, the simulation control unit 110 is configured to deliver a real-time time advance event (time advance event). In this regard, the simulation engine 120 may transmit the real-time time advance event received from the simulation control unit 110 to a System Integration Laboratory (SIL) model, and may transition the state of the SIL model.

Meanwhile, the simulation engine 120 may receive an external data event from the message exchange unit 150 and transmit it to the SIL model, thereby making the state of the SIL model transition.

Meanwhile, the simulation engine 120 may exchange input data and output data of the aviation simulation model through the message exchange unit 150 and the shared memory.

On the other hand, by monitoring the update period of the output message determined according to the specification of the SIL model, real-time can be guaranteed. This process is as follows. In the SIL model 200, a state transition occurs due to time advance and an external data input event, and the result is output to the shared memory or the port of the model by the calculation logic performed at that time, so that the message to be transmitted by the message exchange unit 110 is transmitted. update The message exchange unit transmits the updated message according to the transmission period defined in the ICD of the model of the message, and monitors whether the message update by the SIL model is made within the period.

Meanwhile, in the present invention, control can be performed through control commands related to start/stop/resume/end of aviation simulation. In this regard, an operator may control the simulation control unit by configuring the GUI of the processor in which the simulator operates, or a remote system may control the simulation control unit through communication. The present invention can be applied when configuring a simulator.

On the other hand, the simulation control unit 110 configures settings related to a timer event of hardware in cooperation with an operating system (OS), and when receiving the timer event, transmits a real-time time advance event to the simulation engine to obtain the state of the SIL model It can handle transition tasks.

In addition, upon receiving an external data event from the message exchange unit 110 , the simulation engine 120 may transfer port data related to the external data event to the SIL model to process the task in an event manner.

Meanwhile, FIG. 5 shows the detailed configuration of the SIL model in relation to the linkage between the simulator and the SIL model according to the present invention. 4 and 5 , the SIL model 200 may include an atomic model 210 , a binding model 220 , and an uppermost binding model 230 . In this regard, the atomic model 210 may be configured to include information regarding states, ports, interlock properties, and state transitions. Meanwhile, the combined model 220 may be connected to a plurality of sub-models and configured to include schedule information and port-to-port connection information for the sub-models. In addition, the uppermost coupling model 230 may be connected to the atomic model and the coupling model, and may be configured to include schedule information and port-to-port connection information for the atomic model and a sub-model corresponding to the coupling model. The top-level coupling model is the SIL model itself.

On the other hand, FIG. 5 is a schematic operation concept of the DEVS simulation engine. When the simulator 100 receives events such as time advance and external data input, it transmits it to the uppermost combined model 230 . The delivered event is delivered to the final destination (where the event is utilized), and a state transition occurs according to the state transition rule of the atomic model 210, and as a result, data output and the next schedule time (the atomic model is the next first state transition ( internal transition) is transmitted to the upper coupling models 220 and 230 .

4 and 5 , the simulation engine 120 provides basic operations of the coupling model and the atomic model according to the rules of the DEVS formalism. On the other hand, when the SIL simulation model for aviation is implemented as a function provided by the engine, it operates with the engine's basic operating framework.

The data exchange unit 110 is operated by the setting defined in the SIL model 200 (ICD - Interface Control Document defined as an XML file), and when data is received from the outside, it processes an interrupt and parses the received data immediately. and interworks with the simulation engine 120 so that it can be transmitted to the model. Conversely, the simulation engine 120 may transmit data output by the SIL model 200 as a result of the logic state transition to the data exchange unit 150 . Accordingly, the data exchange unit 150 may transmit data to an external destination through the I/O interface according to the setting (XML file) defined in the SIL model 200 .

In this regard, if all received data is injected as an external input through the simulator 100 , a load is induced in the process of event transmission and model state transition. By analyzing the characteristics of the received data, it can be divided into data that should cause a model state transition and data that do not. Therefore, the simulation engine 120 and the data exchange unit 150 provide the atomic model with an interlocking property function, which is a means of exchanging data through the shared memory, so that data that does not need to be processed as an event can be exchanged, thereby reducing the load. .

Aviation SIL simulation models running with the operation of these engines must ensure real-time. It is not possible to apply real-time monitoring like the existing method (finishing a task within a time frame).

The real-time constraint of the aviation SIL simulation model is to comply with the period of output data specified in the ICD. Accordingly, if the periodic calculation (updating) cycle of the output data is performed within the cycle, the real-time of the model can be guaranteed. Therefore, the data exchange unit 150 continuously checks whether the output data keeps the cycle, and as a result, monitors the real-time of the system.

On the other hand, in relation to the method and apparatus for controlling real-time simulation based on the event driving method according to the present invention, claims are as follows.

1) How to simulate an event-driven simulation model for aviation

- A method to run a model in real time based on events in a discrete event system (DEVS formalism)

- A method of driving simulation models for aviation as real-time software running on a real-time system (HW+RTSE)

- The entity that drives the model consists of the following DEVS simulation engine, message exchange unit, and simulation control unit.

2) DEVS simulation engine (hereafter engine) (120)

- A function and/or operation to receive a real-time time advance event from the simulation control unit and transition the state of the model

- Functions and/or actions to transition the model state by receiving external data events from the message exchange unit

- The function and/or operation of receiving the output resulting from the model's state transition and forwarding it to the message exchange.

- Function and/or operation to share input/output data of aviation simulation model through message exchange and shared memory

Control command processing function and/or operation of simulation start/stop/resume/end received from the simulation control unit

3) Message Exchange (150)

- A function to transmit messages received from external I/O to the engine through events

- Ability to share messages received from external I/O through shared memory with the aviation simulation model operating on the engine

- Function to monitor the update cycle of the output message determined according to the specifications of the aviation simulation model

4) Simulation Control Unit (110)

- Function to transmit simulation control (start/stop/resume/end) commands to the engine by interworking with users or other systems

- Ability to transmit real-time ticks generated from the system to the DEVS simulation engine

In the above, a real-time simulation control apparatus based on an event driving method according to an aspect of the present invention has been described. Hereinafter, a real-time simulation control method based on an event driving method according to another aspect of the present invention will be described.

In this regard, FIG. 6 shows a flowchart of a real-time simulation control method based on an event driving method according to the present invention. In this regard, the real-time simulation control method is not limited to the sequence of the flowchart of FIG. 6 .

6 , the real-time simulation control method includes a timer generation step (S100), a W first state transition step (S200), a message reception step (S300), a second state transition step (S400), and a message transmission step (S500) ) may be included. In this regard, all steps may occur out of sequence in an event manner. On the other hand, as the event is repeated, the execution of a specific step may be omitted.

In the timer generation step (S100), an event that occurs repeatedly according to the timer setting (eg, 1 ms) of the simulation controller may be transmitted to the simulation engine. Accordingly, the first state transition S200 of the SIL model may occur.

In the first state transition step S200, an internal transition of the atomic models within the SIL model occurs according to a real-time flow. In this regard, the internal transition may or may not occur according to the tick generated in S100. On the other hand, when an internal state transition occurs, the transmission message can be updated by performing calculations with input data (via events or shared memory) and outputting the results.

In the message receiving step (S300), the message may be transmitted to the simulation engine according to an event in which the message is received by the external I/O.

Meanwhile, in the second state transition step S400 , a second state transition of the SIL model may occur due to external input data. In this regard, an external data event may be received from the message exchange unit and transmitted to the SIL model, and the state of the SIL model may be transitioned. When a state transition occurs, the transmitted message can be updated by performing calculations with the input data and outputting the result.

Meanwhile, input data and output data of the aviation simulation model can be exchanged through the message exchange unit and the shared memory.

The message sending step (S500) is performed by the message cycle by the ICD setting of the SIL model. If the unit of the timer is 1ms and the transmission message is 20ms, the transmission message can be transmitted every time the timer occurs 20 times. Meanwhile, it is possible to monitor whether the output message is periodically updated by the state transition operation of the SIL model through the transmission message.

S100 and S300 are event sources that occur regardless of order, S200 and S500 may occur after S100 occurs, and S400 may occur after S300 occurs.

Meanwhile, the simulation engine may process to start/stop/resume/end the aviation simulation based on a command from an operator or other system.

I/O data exchange may be performed in connection with handling the aviation simulation to start/stop/resume/end. In this regard, the simulation engine may receive a message received by the message exchange unit through the external I/0 interface, which is a hardware interface, through the message exchange unit. In addition, the message may be shared by the simulation engine and the SIL model through a shared memory.

Meanwhile, the message exchange unit may monitor an update cycle of an output message determined according to the specification of the SIL model.

Meanwhile, referring to FIGS. 5 and 6 , the SIL model 200 may include an atomic model 210 , a binding model 220 , and an uppermost binding model 230 . In this regard, the atomic model 210 may be configured to include information regarding states, ports, interlock properties, and state transitions. Meanwhile, the combined model 220 may be connected to a plurality of sub-models and configured to include schedule information and port-to-port connection information for the sub-models. In addition, the uppermost coupling model 230 may be connected to the atomic model and the coupling model, and may be configured to include schedule information and port-to-port connection information for the atomic model and a sub-model corresponding to the coupling model.

Accordingly, in steps S100 to S500 described above, event delivery and external data output according to time advance and external data may be performed using the atomic model 210 , the coupling model 220 , and the highest coupling model 230 .

In the above, an event-driven method-based real-time simulation control method and apparatus have been reviewed. Looking at the technical effects of the present invention are as follows.

According to at least one embodiment of the present invention, the events of the DEVS formalism applied to the aviation simulation model are the passage of time (advance) and external input data. Therefore, with the above simulation configuration using the DEVS engine, only when an event occurs, the event is transferred into the model to execute the logic, and the inefficiency of the existing periodic repetitive work is improved.

According to at least one embodiment of the present invention, the monitoring for real-time determines whether the model updates (outputs) the output data within a predetermined update period. In this regard, the real-time guarantee of the hard real-time system can be determined by whether the calculation result is output within the deadline. That is, in the conventional method, if it is determined whether the output is calculated within a predetermined time (frame) because the entire iterative task is finished within a time frame, in the present invention, the running model keeps the required update period (period specified in the ICD) of the individual output data, and It can be determined whether

DEVS formalism, which revolves around events, is not compatible with the cyclical processing method, which is a conventional simulation method. Therefore, the present invention can provide a method of operating a DEVS formalism-based model as an event-driven I/O operation and simulation engine, and monitoring to ensure real-time performance.

According to at least one embodiment of the present invention, the event driving method is easier to expand the system than the periodic batch processing method (scalability), and it is possible to efficiently utilize the system performance.

In the method of the present invention, the logic of the model developed with the DEVS formalism is separated from the external I/O communication of the model by the data exchange unit, so the ICD (Interface of the on-board equipment or higher system (avionics system, air vehicle system, etc.) Control Document), the reusability of model logic can be improved.

The features and effects of the present invention described above will become more apparent through the following detailed description in connection with the accompanying drawings, and accordingly, those of ordinary skill in the technical field to which the present invention pertains can easily implement the technical idea of the present invention. I will be able to.

In the present invention, various modifications may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all changes, equivalents, or substitutes included in the spirit and scope of the present invention.

According to the software implementation, not only the procedures and functions described in the present specification, but also design and parameter optimization for each component may be implemented as a separate software module. The software code can be implemented with a software application written in an appropriate programming language. The software code may be stored in a memory and executed by a controller or a processor.

Claims (12)

In the event-driven method-based real-time simulation control method, the method is performed by a processor implemented as a simulator,
a first state transition step of transferring a real-time time advance event received from the simulation control unit to a System Integration Laboratory (SIL) model, and transitioning the state of the SIL model according to the passage of time;
a second state transition step of receiving an external data event from the message exchange unit and transferring the event to the SIL model to transition the state of the SIL model;
and a message transmitting step of transmitting a message about a result of calculation of the SIL model processed through the first state transition and the second state transition. The method of claim 1,
A simulation control method for exchanging input data and output data of an aviation simulation model through the message exchange unit and a shared memory. The method of claim 2,
The simulation control unit transmits a control command of simulation start/stop/resume/end to the simulation engine, and the simulation engine processes the aviation simulation to start/stop/resume/end based on the control command, simulation control Way. The method of claim 2,
The simulation engine receives the message received by the message exchange unit through the external I/0 interface, which is a hardware interface, through the message exchange unit,
and the simulation engine and the SIL model share the message through a shared memory. The method of claim 4,
The message exchange unit monitors the update cycle of the output message determined according to the specification of the SIL model, simulation control method. The method of claim 5,
When a start or resume command is input, the simulation control unit activates a hardware timer and I/O to activate time advance and external data reception event, and when a stop or end command is input, deactivates the external data reception event to stop the simulation which is a simulation control method. The method of claim 1,
The SIL model is
an atomic model including a state, a port through which an event is transmitted from a received message, an interlocking property associated with a shared memory, and information on state transition;
a coupling model connected to a plurality of sub-models and including schedule information and port-to-port connection information for the sub-models;
A simulation control method comprising a top-level coupling model connected to the atomic model and the coupling model, and including schedule information and port-to-port connection information for a sub-model corresponding to the atomic model and the coupling model. The method of claim 1,
In the first state transition step,
Configures settings related to a timer event of hardware in cooperation with an operating system (OS), and processes a state transition task defined in the SIL model through the real-time time advance event when the timer event is received,
In the second state transition step,
When an external data event is received from the message exchange unit, port data associated with the external data event is transferred to the SIL model to process a state transition task defined in the SIL model in an event manner. A simulation control apparatus for performing a real-time simulation control method based on an event driving method, the simulation control apparatus comprising:
a message exchange unit for transmitting and receiving messages through a hardware interface and exchanging the SIL model and contents of the message;
a simulation control unit configured to forward a real-time time advance event to the simulation engine and to control start/stop/resume/end of the simulation; and
Transmitting the real-time time advance event received from the simulation control unit to a System Integration Laboratory (SIL) model to transition the state of the SIL model,
Receives an external data event from the message exchange unit and transmits it to the SIL model to transition the state of the SIL model,
and a simulation engine configured to process a control command of start/stop/resume/end of an aviation simulation received from the simulation control unit. The method of claim 9,
The simulation engine is
Exchanging input data and output data of the aviation simulation model through the message exchange unit and the shared memory,
The simulation control unit transmits the control command to the simulation engine,
The simulation engine processes to start/stop/resume/end the aviation simulation based on the control command, a simulation control device. The method of claim 10,
The simulation engine receives the message received by the message exchange unit through the external I/0 interface, which is the hardware interface, as an event of the SIL model through the message exchange unit, and transmits it to the model port,
The message is shared by the simulation engine and the SIL model through a shared memory,
The message exchange unit monitors the update cycle of the output message determined according to the specification of the SIL model, simulation control device. The method of claim 9,
The simulation control unit,
Cooperating with an operating system (OS) to configure settings associated with a timer event in hardware, and when receiving the timer event, send a real-time time-forward event to the simulation engine to process the first state transition task of the SIL model, ,
Upon receiving the external data event from the message exchange unit, the simulation control device for processing the second state transition task of the SIL model by transferring the port data associated with the external data event to the SIL model.

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