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2020年11月 2日 (月)

ADAS evaluation by driving simulator (2)

Next is automated braking. Automated braking is not simply a braking control of the FVCWS(front vehicle collision warning system). This is because the specification reflects the failure of the FVCWS, and therefore the warning specifications are different. This is also because the braking control is unexpected from the FVCWS.

In many cases, the FVCWS provides two types of warnings of the primary warning, the secondary warning depending on the TTC length. However, the primary warning was not commercially successful because many extra warnings were called "nuisance alarm". Therefore, many automated brakes do not have a primary warning. In addition, while some FVCWSs display vehicle-to-vehicle distance from the viewpoint of providing information, the information providing element of the automated brake is only the secondary warning. Moreover, the timing of the automated brake application is later than the secondary warning, and the method of applying the brake is also an intense sudden brake, which a general driver would not apply it for a lifetime.

Therefore, in the automated braking, the evaluation of the secondary warning timing is mainly performed on the driving simulator. The timing of automated braking is such that evaluation of the driver is unnecessary because of the limit of physically avoiding collision.

Next is ACC (adaptive cruise control). As a driving support system, it is the oldest commercialized system after the FVCWS, and the oldest system when considered as an improved version of cruise control. The ACC can also be equipped with a FVCWS by adding a required sensors and actuators to cruise control. However, like the automated braking, it does not have all the functions of the FVCWS, and it is often only the specifications required for the ACC.

As the evaluation items using the driving simulator of the ACC, it is considered that the deceleration after catching up with the forward traveling vehicle and the control feeling of whether the acceleration is good or bad when the forward traveling vehicle returns to the set speed in absence of the forward traveling vehicle are considered. However, since the control feeling is not suitable for the actual vehicle test, there is no need to use a driving simulator. The use of driving simulators is often used to evaluate the utility and safety assessment of ACC from the perspective of human factors. For example, the driving simulator evaluates the effect of reducing the load on the driving task by the ACC, and whether or not the driver behavior changes by getting used to the ACC.

Historically, the ACC has evolved from a throttle control system to a brake control system, from a speed of 40 km/h or more to a full speed range including stop and go. It goes without saying that driving simulators play an active role in determining the specifications for these advanced human factors.

 

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