Wavetronix SmartSensor Advance Extended Range (SS-200E) - Use Bedienungsanleitung PDF herunterladen (Seite 89)

88 CHAPTER 7  CHANNELS-ALERTS-ZONES

%Utilization

Time Headway

Required

Flow Rate

%Utilization

Ideal

Flow Rate

Figure 7.26 – Equation for Dynamic Density Vehicle Count Threshold

Consequently, the Dynamic Density Count Requirement (DDCR) calculated by the Dy-

namic Density lter is computed as shown in Figure 7.27.

Time Headway x Instantaneous Mean Speed in Zone

%Utilization x Lane Tuning Factor x Zone Size

Dynamic Density

Count Requirement

(DDCR)

= Round

Figure 7.27 – Dynamic Density Count Requirement Equation

If the number of qualied detections is equal to or greater than the DDCR, then the Dy-

namic Density requirement has been satised and the zone output will be activated.

Table 7.1 below reviews the components of the Dynamic Density lter. e number of qual-

ied detections and their average speed is detected by the sensor. en based upon values

of Zone Size, % Utilization, Tuning Factor, and headway parameters entered by the user, the

DDCR will be calculated and the zone output determined.

Component Description

Detected by the Sensor

Qualiﬁed Count The number of vehicles that meet a

zone’s range, speed and ETA ﬁlters.

Speed The average speed of all qualiﬁed detec-

tions in the speciﬁed zone, as calculated

by the sensor (ft per second).

Entered by the User

Zone Size The length of the speciﬁed zone (ft.).

%Utilization Speciﬁed by the user (%).

Tuning Factor Speciﬁed by the user.

Headway Speciﬁed by the user (seconds per ve-

hicle).

Table 7.1 – Description of Dynamic Density Equation

Click in the display area beneath the Dynamic Density label to edit the Dynamic Density

lter (see Figure 7.28).

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Wavetronix SmartSensor Advance Extended Range (SS-200E) - Use Bedienungsanleitung Seite 89