STISIM Drive
(SDL) - STCW - Steering Control Warning
This event allows you to
test the driver to see if they can adequately control the vehicle's steering.
The program checks the drivers RMS steering rate and lane position over a specified
time interval. If the driver is able to control the steering, the program
continues, if not, the program will play a steering warning message. The
steering warning message is found in the file
"C:\STISIM\Sound\Steerwrn.wav". The idea behind this event is that
the driver must be able to control the vehicle, or all of the data you collect
will be worthless. This event allows you to see if the driver can control the
vehicle's steering. The driver must "pass" both criteria before the
program will continue.
EVENT PARAMETERS:
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PARAMETER 1: |
The time, in seconds, of the interval when the driver's steering will be checked. |
|
PARAMETER 2: |
The number of times, the driver can "fail" the steering criteria before they automatically pass. |
|
PARAMETER 3: |
The passing RMS value for the driver's lane deviation, in feet, during the testing interval. If the driver's score is less than this value, they will "pass" and the program will proceed as normal. |
|
PARAMETER 4: |
The passing RMS value for the driver's steering rate response, in degrees/second, during the testing interval. If the driver's score is less than this value, they will "pass" and the program will proceed as normal. |
|
PARAMETER 5: |
Volume control when playing back the warning file. Values range from 0 to 10. |
EXAMPLE:
0,STCW,30,5,1,30,10
One unfortunate consequence
of using a simulator is that it does not act like the vehicle the driver normally
drives and therefore there is some learning that the driver must go through in
order to became familiar with the simulator. This is particularly important
when it comes to steering the vehicle. If the driver can not control the lane
position and heading of the vehicle, then they may not be able to perform the
simulation task that you have designed. Unlike the SPCW
event, this test actually computes a pass/fail to determine if the driver can
control the vehicle. The parameters allow you to set the criteria for passing
as well as the number of tries the driver gets before they will automatically
pass. During any testing interval, if the driver is unable to sufficiently
control the vehicle with steering, STISIM Drive will play the
warning message.
In the above example the ON
DISTANCE is set to 0 so the event will take place at the start of the run.
The first 2 parameters tell STISIM Drive that there will be 5,
30 second testing intervals (30,5). The criteria for passing is set to 1 foot
for the lane deviation and 30 degrees/second for the steering wheel rate
(1,30). If the driver fails during the first interval, the recording will be
played and a new interval will begin. If the driver passes, then the event ends
and the driver should be able to sufficiently steer the vehicle during the
simulation run. Since the main focus of this event is to provide the driver
with some auditory feedback on their steering control, in the example the
volume has been set to a maximum value of 10.