Hardware-in-the-loop (HIL) testing concept in Simulink - Mini Project: Build & Apply

Hardware-in-the-loop (HIL) Testing Concept

📖 Scenario: You work in a company that builds control systems for cars. Before sending your control software to the real car, you want to test it safely using a computer simulation connected to real hardware parts. This method is called Hardware-in-the-loop (HIL) testing.In this project, you will create a simple Simulink model that simulates a car's speed control system and connect it to a hardware component for testing.

🎯 Goal: Build a basic Simulink model for HIL testing that simulates a car speed controller and connects to a hardware interface block.

📋 What You'll Learn

Create a Simulink model with a speed input signal

Add a hardware interface block to simulate connection to real hardware

Configure a threshold speed value for testing

Implement logic to compare actual speed with threshold

Display the test result in the Simulink model output

💡 Why This Matters

🌍 Real World

HIL testing is used in automotive and aerospace industries to safely test control software with real hardware components before deployment.

💼 Career

Understanding HIL testing helps engineers validate embedded systems and improve product safety and reliability.

1

Create the initial Simulink model with speed input

Open Simulink and create a new model. Add a Constant block named speed_input with value 50 to represent the car speed in km/h.

Simulink

# Add a Constant block named speed_input with value 50
# Your code here

Hint

Use the Simulink library to drag a Constant block into your model. Set its value to 50 and rename it to speed_input.

2

Add a threshold speed configuration

Add another Constant block named speed_threshold with value 60 to represent the speed limit for testing.

Simulink

% Simulink model setup
% Add Constant block named speed_input with value 50
% This block represents the car speed input

# Add a Constant block named speed_threshold with value 60
# Your code here

Hint

Drag another Constant block and set its value to 60. Rename it to speed_threshold.

3

Implement comparison logic for HIL testing

Add a Relational Operator block to compare speed_input and speed_threshold. Set the operator to <. Connect speed_input to the first input and speed_threshold to the second input of the relational block.

Simulink

% Simulink model setup
% Add Constant block named speed_input with value 50
% This block represents the car speed input
% Add Constant block named speed_threshold with value 60
% This block represents the speed limit threshold

# Add Relational Operator block with operator '<'
# Connect speed_input to first input and speed_threshold to second input
# Your code here

Hint

Use the Simulink library to add a Relational Operator block. Set the operator to <. Connect the speed_input block to input 1 and speed_threshold to input 2.

4

Display the HIL test result

Add a Display block and connect it to the output of the Relational Operator block. Run the simulation and observe the output showing if the speed is below the threshold.

Simulink

% Simulink model setup
% Add Constant block named speed_input with value 50
% This block represents the car speed input
% Add Constant block named speed_threshold with value 60
% This block represents the speed limit threshold
% Add Relational Operator block with operator '<'
% Connect speed_input to first input and speed_threshold to second input

# Add Display block connected to Relational Operator output
# Run simulation and observe output
# Your code here

Hint

Drag a Display block from the Simulink library and connect it to the output of the Relational Operator block. Run the simulation to see the result.