Difference between MIl, SiL, PiL, and HIL Testing

Top Automotive companies hire candidates who are good with these kinds of tests. I am talking about model-in loop, software-in loop, process-in loop, and hardware-in loop. Let’s consider one plant model (example engine) and one controller logic to control the plant model. In the case of a model-in loop, you will design Simulink models or any other Simulations models for both plant model and controller logic and you run both models together. In the case of a software-in loop. The plant model will remain as it is, but control logic will be converted to C code or S-function (if you are using MATLAB). In the case of a Process-in loop, again plant model remains as it is, but the source code of controller logic is flashed into hardware, and then the plant model and controller hardware are executed together. Well, in the case of a hardware-in loop, the plant model will be actual hardware, and the source code for the controller is generated from Models and then flashed into the hardware.