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2020年11月 5日 (木)

Take-over evaluation by driving simulator (2)

What happens if the automated driving system requests a take-over when the driver is doing other tasks than monitoring the surroundings? In such a situation, a smooth take-over cannot be expected, and the automated driving originally for improving safety may cause a dangerous situation.

In Level 2, although the operation control is performed on the automated driving side and the peripheral monitoring is performed on the driver side, the automated driving side also performs the peripheral monitoring to actually perform the operation control. Therefore, even if the driver neglects the peripheral monitoring, appropriate operation control is performed in most cases.

Therefore, there is a concern about the occurrence of a driver who misunderstands the specification of Level 2 as not requiring peripheral monitoring. In addition, in a situation where operation control is not required, there is a concern that the operator may not be able to concentrate on monitoring the surroundings even if the driver is obliged to monitor the surroundings. As a matter of course, if the driver himself/herself is driving, he/she cannot drive without monitoring the surroundings, so the driver concentrates on monitoring the surroundings. We all know that if you're doing some kind of task, such as using a cell phone to focus your attention on a conversation, you can't focus on monitoring your surroundings and drive safely. Therefore, there may be a problem in imposing the obligation to monitor the surroundings with the specification that makes it impossible to concentrate on monitoring the surroundings.

The reason why there is a problem in monitoring the surroundings of the level 2 automated driving is based on the results of an experiment using a driving simulator conducted in this laboratory. The degree of concentration of peripheral monitoring by most of the experiment collaborators is reduced by experiencing automated driving with only peripheral monitoring without operation control.

Not only does it decrease concentration, it also decreases alertness. In other words, if you keep driving without driving control, you'll feel sleepy.

Rather, they seem to be less drowsy when performing tasks other than perimeter monitoring. For example, not only monitoring the surroundings, but also watching a video on the navigation screen or a smartphone will not cause drowsiness. However, in this case, it is a so-called inattentive driving. It cannot be said that sufficient monitoring of surrounding areas is being conducted.

A driver monitor that analyzes the driver's face with a camera to determine whether the driver is concentrating on peripheral monitoring is considered. In the present image processing, it is possible to detect the driver's line of sight, the number of blinks as an index of sleepiness of the driver, and the degree of opening and closing of the eyelids, so that it is possible to determine whether the driver is concentrating on monitoring the surroundings.

If the driver monitor detects that the driver concentration has decreased, an warning is issued to warn the driver. If you doze off, it can be used as a doze warning.

In the automated driving of level 2, the driver tends to reduce the concentration of peripheral monitoring. Therefore, when the driver monitor is mounted to monitor the driver, the warning is always activated during the automated driving at level 2. Is this a good driver? Warning sounds are not usually pleasant sounds. The noise is intended to warn the driver, so unpleasant sounds should be more responsive to the driver. Therefore, the driver monitor warning sound may impair the comfort of the automated driving.

We wonder if we should go into the automated driving mode while being monitored by the driver monitor, or we should just stick to manual operation because we don't want to hear unpleasant warning sounds. At first you'll probably try the self-driving mode, however eventually you'll only be driving manually.



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