IEEE Consumer Electronics Magazine - September/October 2019 - 95

Figure 2. Structural relations between the
constituent systems of the SoS involving automated
vehicles.

an explanation of the actions the ADS is executing, a suggestion of behaviors the driver should
implement by the ADS, and feedback on the driver's state. These HMI functionalities can lead to
requirements.
The requirement traceability for the HMI
requirements is shown in Figure 3. In particular,
the requirement "ADS Operating," "Driver Behavior Guide," "Accident Risk Warning," and "Driver
State Feedback" are derived from the requirement "Driver-HMI Interaction." The rationale for
deriving the requirements refers to the "Results
of considering the viewpoint of the context of
the SoS involving automated vehicles." In addition, the HMI functions shown in Figures 4 and 5
are asserted to satisfy the HMI requirements.
The relationships of derivation and satisfaction
enable traceability from the requirements to the
system design, and analysis, along with the supporting rationale. Although not covered in this
section, the new requirements for the HMI can
be obtained through the design and verification
process. For example, the interface requirements of the HMI can be obtained by inspection
of the logical relationship and input/output flow
between functions in the functional flow of the
HMI, and the performance requirement of the
HMI can be obtained through the driver's
response, such as the driver's reaction speed,

September/October 2019

Figure 3. The requirement traceability for the HMI
requirement "Driver-HMI Interaction."

cognitive degree, and propensity in the process
of verifying the HMI with the driving simulator.

DESIGN-HMI FUNCTIONAL FLOW
The functional flow of the HMI described in
the system model (Figure 4). This HMI functional
flow is defined based on the results of the verification by inspection of the logical relationship
and input/output flow between functions.
The function "display ToVC information," and
"monitor driver" allocated to the HMI realizes
the interactions between the driver and the ADS.
The functional flow of the HMI inner functioning indicate how the HMI delivers the information
of external systems, the ADS, and the driver's
own to aid both the ADS and driver narrow the
differences in decision-making between them by
enhancing the driver's understanding (Figure 5).
The function "inform of ADS" is first initiated and
it shows what ADS actions are being executed or
will be executed and what mode is currently
being activated. This function can enhance a driver's understanding of how the ADS is currently
operating. The function "warn of the risk of
accidents" is executed following the function
"inform of ADS," and shows the risk of collision

95



IEEE Consumer Electronics Magazine - September/October 2019

Table of Contents for the Digital Edition of IEEE Consumer Electronics Magazine - September/October 2019

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