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when to use hardware-in-the-loop simulation

use hil simulation to test the design of your controller when you are performing model-based design (mbd). the figure shows where hil simulation fits into the mbd design-to-realization workflow.

validation involves using actual plant hardware to test your controller in real-life situations or in environmental proxies (for example, a pressure chamber). in hil simulation, you do not have to use real hardware for your physical system (plant). you also do not have to rely on a naturalistic or environmental test setup. by allowing you to use your model to represent the plant, hil simulation offers benefits in cost and practicality.

there are several areas in which hil simulation offers cost savings over validation testing. hil simulation tends to be less expensive for design changes. you can perform hil simulation earlier than validation in the mbd workflow so you can identify and redesign for problems relatively early the project. finding problems early includes these benefits:

in terms of scheduling, hil simulation is less expensive and more practical than validation because you can set it up to run on its own.

hil simulation is more practical than validation for testing your controller’s response to unusual events. for example, you can model extreme weather conditions like earthquakes or blizzards. you can also test how your controller responds to stimuli that occur in inaccessible environments like deep sea or deep space.