Hardware in the Loop (HiL) CT-AUT Practice Questions (Page 6)

Questions 26–30

1. 26foundation · easy

   What is meant by 'synchronization' in the context of HiL testing?

   • ACoordinating the timing of the simulation model, I/O signals, and the ECU's communication cycles
   • BMaking sure the test engineer and the ECU are in the same room
   • CEnsuring the ECU software is compiled with the same compiler version
   • DAligning the test data files with the test report
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2. 27expert · hard

   A HiL test for a steering ECU is being set up. The ECU receives a torque sensor signal and controls an electric motor. The test needs to verify that the ECU correctly handles a sensor failure where the torque sensor outputs a constant value of 5 Nm. The test engineer is considering two approaches: (1) override the sensor signal in the I/O interface, or (2) use a fault insertion unit to short the sensor signal line. Which approach is more appropriate?

   • ANeither approach is appropriate; the test should be done on a real vehicle.
   • BBoth approaches are equally appropriate.
   • COverride the sensor signal in the I/O interface.
   • DUse a fault insertion unit to short the sensor signal line.
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4. 28application · medium

   A HiL test for a body control module (BCM) needs to simulate a door lock actuator. The actuator is a DC motor that draws current when activated. The BCM monitors the current to detect a stuck actuator. How should the actuator be simulated in the HiL environment?

   • AUse a load simulator that presents the correct electrical load to the BCM output and measures the current.
   • BConnect a real DC motor to the BCM output.
   • CUse a simple resistor to simulate the actuator's resistance.
   • DBypass the actuator simulation and directly feed the current measurement back to the BCM.
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5. 29application · medium

   After a HiL test, the test engineer reviews the logged data. The ECU's output signal shows a glitch that lasts for 2 ms. The plant model is running at a 1 ms step size. The glitch is not present in the reference simulation. What is the most likely cause?

   • AThe data logging rate is too low to capture the glitch accurately.
   • BA timing issue in the real-time processor caused a missed deadline.
   • CThe plant model is too simple to reproduce the reference behavior.
   • DThe ECU is responding to a real fault in the simulated environment.
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6. 30foundation · easy

   Why are plant models used in HiL testing instead of connecting the ECU to the real physical system?

   • ATo allow testing under conditions that are dangerous, expensive, or impossible to reproduce with the real system
   • BTo ensure the ECU software runs faster than real time
   • CTo make the test environment more complex and difficult to set up
   • DTo reduce the need for any software testing
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