Meaning
Verification technique for safety-critical systems tests the response of hardware against physical or electrical errors introduced during real-time operation. Hardware in the loop fault injection validates that the system remains stable when sensors or actuators fail by simulating those failures on a test bench. It bridges the gap between pure software simulation and final field testing.
Error Simulation
Physical faults like short circuits or open wires are created using a switching matrix connected to the device under test. During hardware in the loop fault injection, the system is monitored to see if it detects the fault and enters a safe state. This is necessary for automotive and aerospace certifications where hardware failures must be handled gracefully.
System Resilience
Testing focuses on how the firmware recovers when it receives garbage data from a corrupted peripheral. If hardware in the loop fault injection causes the system to freeze or behave unpredictably, the design is rejected. The goal is to prove that the product can mitigate the impact of a physical hardware defect.
Test Bench
Components are mounted in a rack that mimics the final installation environment. The hardware in the loop fault injection setup includes real-time computers that simulate the environment and log the response of the controller. These logs are used as evidence for regulatory compliance.
