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2020年11月 3日 (火)

ADAS evaluation by driving simulator (3)

Next is the lane departure warning system. It is a system to warn of the deviation from the lane during driving and also called LDWS. The LDWS is intended to be used on expressways because it detects white lines on both ends of the front driving lane with a in-vehicle camera. In case of driving in generic roads of city area, there are many white lines other than those indicating the edge of the road on the road surface, so that the vehicle is operated at, for example, 60 km/h or more in many cases.

The following items can be evaluated using the driving simulator of LDWS.

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 (It often crosses the inner white line when curves.)

The warning timing validates the distance to the white line and how many seconds it takes to reach the white line. The warning means evaluates whether it is a sound, a display, or a haptic to vibrate the steering wheel. Overdetection and undetected are the same concept as the FVCWS. Since many drivers cut in the white line inside the curve on curved roads, the degree of cut-in should be evaluated as a countermeasure against overwarning.

Next is LKA (Lane Keep Assist). The LKA is not a system which only adding steering control to the LDWS as the automated braking is not a system which only adding brake control to the FVCWS. However, the hardware configuration of the LKA is a lane departure warning system plus steering control. Therefore, the in-vehicle camera that recognizes the driving lane is the same.

However, the LKA does not issue a lane departure warning when the LKA is in operation because the LKA does not deviate from the lane. Therefore, the main evaluation item using the driving simulator of LKA is whether the control condition on the curved road is accepted by the driver. Normally, the driver tends to move toward the inside of the lane when driving on a curve. Therefore, even if the vehicle is traveling while maintaining the center of the lane in a straight line, the driver may feel uncomfortable when maintaining the center of the lane in a curved road. Therefore, it is necessary to confirm how far the vehicle approaches the inside of the curve by the lane control during the curve driving.

The LKA prevents the driver from operating unless the driver is holding the steering wheel. Therefore, an alarm sound and an alarm method when the driver's hand is released from the steering wheel, and the HMI of how many seconds after the driver's hand is released from the steering wheel to release the control are also the evaluation items in the driving simulator.

FVCWS, automated braking, ACC, LDWS and LKA are the main advanced driver assistance systems. In addition, there are diagonal rear vehicle warning at the time of lane change, automated lane change, peripheral warning at the time of parking, automated parking, etc.

In any of the advanced driver assistance systems, the human factors of the HMI concerning the information provision method to the driver and the warning can be evaluated by the driving simulator, and the experiment can be conducted more safely and efficiently than the actual vehicle. Since the control feeling can be regarded as a kind of HMI, it can be evaluated by a driving simulator. However, for the control feeling, it is necessary to use a driving simulator that can reproduce G just like a real vehicle, and in the case of using a driving simulator that only has images without moving devices, it is necessary to carefully select evaluation items.

 

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