Hardware in the Loop (HiL) CT-AUT Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A HiL test bench for a brake-by-wire ECU is being set up. The plant model outputs the master cylinder pressure as a physical quantity in bar. The ECU's analog input expects a voltage signal. During signal mapping, the test engineer must ensure the pressure value is correctly converted. What is the most appropriate action?

   • AUse a software-in-the-loop simulation to bypass the need for signal conversion.
   • BConfigure the I/O interface to scale the plant model output from bar to the corresponding voltage range of the ECU input.
   • CConnect the plant model output directly to the ECU without any conversion, as the ECU can interpret the bar value.
   • DModify the plant model to output the pressure directly in volts instead of bar.
   Reveal Solution Discussion Select an answer first
2. 7application · medium

   A HiL system is being set up to test a battery management system (BMS) ECU. The plant model simulates the battery cells' voltage and temperature. The BMS reads these signals via analog inputs. The test engineer needs to ensure the signals are accurately represented. What is the most critical component to configure correctly?

   • AThe data logging rate.
   • BThe real-time processor's clock speed.
   • CThe I/O interface that converts the plant model outputs to analog voltages.
   • DThe host PC's operating system.
   Reveal Solution Discussion Select an answer first
4. 8application · medium

   A HiL test is designed to verify that an airbag ECU correctly detects a crash and deploys the airbag. The test needs to simulate a sensor failure where the acceleration sensor outputs a constant value of 0 g during a crash event. What is the most appropriate way to implement this in the HiL environment?

   • AOverride the sensor signal in the I/O interface to force the acceleration value to 0 g during the crash simulation.
   • BModify the plant model to output a crash acceleration profile that naturally results in 0 g.
   • CUse a fault injection unit to short the sensor signal to ground.
   • DDisconnect the sensor from the ECU and leave the input floating.
   Reveal Solution Discussion Select an answer first
5. 9expert · hard

   A HiL test for an anti-lock braking system (ABS) ECU is being developed. The plant model simulates the vehicle's longitudinal dynamics. The test engineer needs to validate the ECU's behavior during a panic brake on a split-mu surface (different friction coefficients on left and right wheels). The model must run in real-time. What is the most important consideration when developing the plant model?

   • AThe model must be developed in Simulink to be compatible with the HiL system.
   • BThe model must be as simple as possible to ensure real-time execution.
   • CThe model must accurately represent the different friction coefficients for each wheel and their effect on wheel slip.
   • DThe model must include a detailed tire model with thermal effects.
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   How are HiL test results typically compared against expected behavior?

   • ABy visually inspecting the ECU's LEDs
   • BBy comparing logged signals with reference values or tolerance bands defined in the test specification
   • CBy listening to the sound of the engine in the simulation
   • DBy asking the test engineer to guess if the behavior is correct
   Reveal Solution Discussion Select an answer first