How MIL,SIL is a Closed Loop Testing ?
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Aluri Pramod Kumar
el 27 de Abr. de 2015
Comentada: SHASHWAT KANHAIYA
el 12 de Ag. de 2022
Closed Loop Testing
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jagpreet makkad
el 14 de Mayo de 2015
Editada: jagpreet makkad
el 14 de Mayo de 2015
I will give you an overall idea about the MIL SIL PIL and HIL. I have read it somewhere and sharing it with u. By reading this u will get the clear idea of what actually is plant model and what is controller model and how design testing flow works.
If you are designing the controller from scratch then you develop the model of the plant and controller (say using Matlab,SIMULINK) and use MIL to verify or test whether it is implementable. Whereas if you already have the controller model you can skip MIL and go to SIL.
Once your model is verified, the next stage is SIL where you develop a software/HDL code depending on the processor or FPGA you plan to use for final hardware implementation and run the simulations for the controller model (with the plant still a software model) with this code to verify it. If you experience any glitches you may have to go back to MIL and make necessary changes. If you have a model which has been tested for SIL also then you can skip this and go directly to PIL.
Once your controller is verified for its SIL implementation, you proceed to the next stage i.e., PIL where you load the developed code onto the processor/FPGA and run the simulations on the modeled plant for verification. If there are glitches then go back to your code, SIL or MIL and rectify them. If you have an FPGA or a processor ready then you can skip this and go directly to HIL.
Once your plant model has been verified using PIL, now you can replace the plant model with the original hardware ,say lab model, (say,if its a DC motor whose speed controller is being designed, then controller is in FPGA/processor which is now interfaced to the DC motor by connecting the inputs and outputs/states at the right points of sensors/transducers) and conduct the HIL test for verification.
Once you complete all the above tests, your controller is said to be ready for hardware implementation.
If supposing you give National Instruments your plant specifications and controller requirements, they may design an FPGA based on Labview and give it to you.In that case you can directly run the HIL and verify.
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SHASHWAT KANHAIYA
el 12 de Ag. de 2022
i Think, in this answer Plant model has been replaced with controller model and viceversa.
pls correct me if i misunderstood
Más respuestas (2)
Gaurav Shukla
el 27 de Abr. de 2015
Broadly speaking when you create a controller model for validation of the logic you connect the output of your controller to a plant model and output from plant is fed back to controller. Thereby creating a closed loop.
For SIL you replace the model logic for your controller with the generated code rest all process remains the same.
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Jesús
el 4 de Abr. de 2019
We don`t perform only PIL and HIL, because PIL and HIL test different things.
- PIL is used to check the code of the processor against a Matlab/Simulink model of the plant. The connection between the processsor and the Matlab model are digital signals.
- HIL is used to check the final hardware of the controller and the final processor code. The connection between the processor and the Matlab model are hardware electronics.
For example, in case of the development of an ECU of a car:
- PIL could be a prototype board using same processor than the final ECU, connected to a PC running matlab model and communicating by ethernet.
- HIL will consist of the final ECU with final hardware electronics, connected to the HIL simulator using the final connector of the ECU. The HIL simulator includes a complete model of dynamics of the car, other ECUs and hardware for simulating the sensor and actuators connected to the ECU. In addition, the advanced HIL simulator test the electronics injecting hardware errors, as short circuits or break of cables at the conector of the ECU. So, the HIL testing check the hardware of the ECU and the interaction with other componentes.
Ahmed Gad
el 14 de Jun. de 2019
You can check the following link to know about everyone of them.
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