Software in the Loop (SiL) CT-AUT Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A team is comparing SiL and HiL for testing a new airbag control unit. The SiL environment is already set up and runs the full test suite in 30 minutes. The HiL environment is being prepared and will include the physical airbag ECU and a real-time simulator. The team needs to decide which environment to use for a test that must verify the exact timing of the firing signal with microsecond precision. Which environment is more appropriate, and why?

   • AHiL, because it uses the real ECU and real-time hardware, providing higher timing fidelity
   • BSiL, because it does not require the physical ECU, so the test is safer
   • CSiL, because it runs faster and is already set up, so timing precision is less important
   • DHiL, because it is always faster than SiL for any test
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A test team is configuring a SiL environment for a transmission control unit (TCU). The plant model simulates the engine, gearbox, and vehicle dynamics. The test cases need to run in a continuous integration pipeline. Which configuration step is essential to ensure the SiL environment can be used effectively in this automated pipeline?

   • AConfiguring the simulation to run in batch mode with automated test execution and result logging
   • BInstalling the TCU in a test bench with a physical gearbox
   • CConnecting the TCU to a real-time simulator with a hardware interface
   • DEnsuring the plant model is compiled for the same processor as the TCU
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   In the automotive software development lifecycle, when is SiL testing most beneficial?

   • AOnly for testing hardware components.
   • BDuring the early software development phases, before hardware is available.
   • COnly after the vehicle is in production.
   • DOnly during final vehicle validation.
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   A test engineer is running a SiL test for a window lift control module. The test case involves simulating a window that is blocked by an obstacle. The engineer needs to verify that the software reverses the window direction within a specified time. After the simulation, the engineer has a log file with the motor current and position signals. What is the correct way to determine if the test passed?

   • ACheck if the simulation completed without any error messages
   • BCompare the logged motor current and position signals against the expected values defined in the test case
   • CRun the test again with a different obstacle size and see if the result changes
   • DVisually inspect the log file to see if the window moved in the reverse direction
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A test engineer is executing a SiL test for a lane-keeping assist function. The test case specifies a scenario where the vehicle drifts toward the lane boundary at 80 km/h. After running the simulation, the engineer needs to verify that the software issued the correct steering torque command. What is the most appropriate way to collect and assess this result in the SiL environment?

   • ARun the test again with a different simulation step size and observe the result
   • BLog the steering torque signal from the software output and compare it against the expected value in the test oracle
   • CMeasure the actual steering wheel angle with a physical sensor on a test vehicle
   • DInspect the plant model code to confirm the torque command was generated
   Reveal Solution Discussion Select an answer first