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2020年11月 1日 (日)

ADAS evaluation by driving simulator (1)

 9月、10月と続けた内容の一部をまとめ直し英訳したものを2週間程度続ける。

Here, the advanced driver assistance systems that can be evaluated by the driving simulator and the functions that can be evaluated are described. The advanced driver assistance systems have the lowest automation rate at the lowest level of automated driving level 1, however they have far more specifications than level 2 or higher automated driving.

First, let's see the front vehicle collision warning system. It is the oldest system in the Advanced driver assistance systems. The basic function of this system is to measure the distance between the vehicle and the vehicle traveling ahead on the same lane, and to issue a warning to the driver when the TTC falls below a certain threshold. The driving simulator can be used for the following evaluation items.

1)appropriateness of warning timing
2)Validity of the means of warning
3)validity of the overdetection rate
4)Validity of the undetected rate
5)Evaluation of product quality on curved roads (During curves, guardrails are often detected and false warnings are issued.)

Overdetection means that something other than a vehicle traveling ahead is detected, and it is a type I error. Undetected means that the vehicle traveling ahead is not detected, which is a type II error.

Since the front vehicle collision warning system does not have vehicle control and only provides information to the driver, the evaluation items in the driving simulator are mainly related to HMI. Validity evaluation of warning timing is the basis of a warning system that evaluates the delay when the system issues the warning and the response time of the driver.

The validity of the warning means is to evaluate whether the warning is given by sound or display, or by haptic vibration of the steering wheel, and the contents of each means. For example, when the warning is given by sound, the tone color, volume, output method, and the like are evaluated, and a sound of 4 KHz is determined to be an intermittent sound of 80 db at 2 Hz.

There are various external sensors such as LiDAR, radio wave radar, camera, etc., for detecting the vehicle traveling ahead by the front vehicle collision warning system. It is difficult to detect any vehicles 100% correctly. Since the characteristics of the sensor include over-detection (type I error) and non-detection (type II error), it is necessary to evaluate whether each is acceptable to the driver. Depending on the type of sensor, the engineer knows under what circumstances the over-detection or non-detection is likely to occur, so that it is possible to reproduce the situation of the erroneous detection by the driving simulator, so that the evaluation by the driving simulator becomes possible.

Depending on the driving scene, a false warning which cannot be classified as overdetected or undetected may occur. A typical case is a case where a guardrails enter a detection range of a sensor and erroneously recognizes it as a preceding vehicle when traveling on a curved road with a small curvature. The degree to which these false warnings are acceptable to the driver can also be evaluated by the driving simulator.

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