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2020年11月 6日 (金)

Take-over evaluation by driving simulator (3)

At level 2, the automated driving controls the operation, so that the vehicle can be operated by hand-off driving. However, if the driver is hand-off state, concentration of monitoring around the vehicle decreases as described above.

For this reason, in most of the level 2 equivalent automated driving currently marketed, automated driving does not work unless the driver grips the steering wheel. If the driver hold the steering wheel, the driver can naturally focus on driving and on monitoring the surroundings, even if the automated driving is operating the steering and pedals.

Holding the steering wheel makes it the same as Level 1's Keep Lane Assist. Keep lane assist generally doesn't work unless the driver hold the steering wheel. Keep Lane Assist does not involve pedaling, but when combined with Level 1 Adaptive Cruise Control, it is the same as Level 2. In other words, if the driver should hold the steering wheel at level 2, it is not different from level 1.

When the driver hold the steering wheel, it is easy to take-over, and there is no problem because it concentrates on monitoring the surroundings. However, it is no longer meaningful to distinguish Level 1 from Level 2, and the significance of existence of Level 2 is lowered.

As long as the driver hold the steering wheel, level 2 and level 1 are not much different. So what about Level 3? At level 3, in addition to the operation control being performed by the automated driving side, the peripheral monitoring is also performed by the automated driving. Therefore, the driver has no monitoring obligation.

Since there is no peripheral monitoring obligation, the driver can do anything while driving in the automated driving mode. The driver can enjoy a DVD movie on the navigation screen, or he/she can watch it on his/her smartphone. But can he/she off? A take-over request may also occur for Level 3 from automated driving. That is, when a situation is encountered or a failure occurs in which the automated driving system cannot respond. At this time, if the driver is dozing off, it is impossible that the driver can smoothly take-over.

Therefore, mounting of a driver monitor is also considered. Unlike Level 2, the system does not warn the degree of concentration of monitoring around the area, so the warning for looking aside disappears, but the warning must be issued when the driver falls asleep.

In fact, a number of doze warnings have been researched and developed and commercialized. However, private vehicles with doze warnings are not common. The general idea is not to drive when the driver feels sleepy. If the driver feels sleepy, the usual way of thinking is to take a rest and take a nap instead of driving.

Also, is it effective to detect a doze and give the warning? Although a temporary effect can be expected, it is difficult to prevent falling asleep on a continuous basis. Therefore, after the driver monitor mounted on the level 3 automated driving detects the decrease in the driver's arousal level and warns the driver to raise the arousal level once, the automated driving should be canceled. In other words, the driver can't doze off at level 3. If the driver feels sleepy, he/she has to rest at a drive-in.

 

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