Sheik Mohammed Ali S, Boby George and Lelitha Vanajakshi … mobility... · 2020-01-24 · Sheik...

July 13th 2012 Indian Institute of Technology Madras, India UMCSP 2012

Sheik Mohammed Ali S, Boby George and Lelitha Vanajakshi

Indian Institute of Technology Madras, India

July 13th 2012 UMCSP 2012

Intelligent Transportation System

Traffic Control Room

E-Message

Sends

Information

Traffic Signal

Control

Traffic

Detector

2


3

Homogeneous and Heterogeneous Traffic

Homogeneous Heterogeneous


4

Traffic Detector

•Detect various vehicles reliably

•Categorize as bus, car, motor cycle, bicycle, etc.

•Count

•Measure the speed of the vehicle

•Direction of movement

•Keep the power dissipation low

Heterogeneous


Traffic Flow Sensors

Tape switch-US 4568937, US 4472706 Video Image-US 7646890, US5535314

Inductive Loop Detectors-US4472706, US3571789 Microwave radar-US5266954,

US7439876

5

In-roadway Sensors Over-roadway Sensors


Inductive loops

Inductive loops are placed inside a Saw cut made in the road

Detector System

Existing Inductive Loop Detector

suitable only for

lane disciplined and homogeneous traffic

6

Detector System


The Proposed Inductive Loop Detector

7


Magnetically Coupled Inductive loops

8

N

1

N

2

N

n3

N N

n-1

N

Measurement

Unit

a b

Mutually coupled inductive loop detector with the multiple inner loop (1, 2, …n)

and a single outer loop. All the inner loops are identical and a pictorial view of the

loop employed is shown right side.


Electrical equivalent circuit

9

ZS

L1

C1

L2

C2

L n -1

Cn-1

vin

L n

Cn

M1

M2 M3

M4

L

vo

Magnetically-coupled inductive loop system


The Measurement Scheme Employed for the

Magnetically Coupled Inductive Loops

10

ZS

ADCvo

varb

Programmable Synchronous demodulator

+

x2

y2

LPF

LPF90o

x

y

√x

2+

y2

x/ytan-1vo1

vr

1

2

n

φφφφ

varb = vm(sin2πfp1t + sin2πfp2t +, ….+ sin2πfpnt).


11

Multiple Inner loops

Single Outer loop

Inductive Loops Switched with the carpet

Experimental Setup and Results

Measurement

System

Measurement

System


12

Multiple Inner loops

Single Outer loop

Inductive Loops Switched with the carpet

Experimental Setup and Results

Measurement

System

Measurement

System


13

fp1fp2

fp3

Results of the Sensitivity and Resonance

Frequency shift Test

Sen

siti

vit

y

(Norm

ali

zed

)

Sensitivity testThe parallel resonance frequency shift in the

presence of a conductive/metallic object


14

Front Wheel Rear Wheel

Front AxleRotating

Shaft

Front Wheel Rear Wheel

Measurement unit

BUS

L1

L2

L3

L4

L5

Results from the Mutually Coupled Multiple

Loop Detector

Signature of a bus obtained from multi-

loop vehicle detector



Loop Detector

Right side

wheels

Left side

wheels

Entire lower

body

15

Measurement unit

L1

L2

L3

L4

L5

CAR

Signature of a car obtained from multi-

loop vehicle detector


BicycleBicycle

Bicycle

Bicycle

Motorbike

Motorbike

Scooter

Scooter

16

Measurement unit

L1

L2

L3

L4

L5


Loop Detector

Signature obtained from all the three loops

when there was continuous movement of vehicles


17


Loop Detector with Outer-loop resonating

Signature of a bus obtained from single

outer loop and multiple inner loop

ZS

L1

C1

L2

C2

L n -1

Cn-1

vin

L n

Cn

M1

M2 M3

M4

L

vo

C


18


Loop Detector with Outer-loop resonating

Signature of a car obtained from single

outer loop and multiple inner loop

Signature obtained for the continuous

movement of vehicles from single outer

loop and multiple inner loop


19

Thank you

ACKNOWLEDGMENT

�The support provided by Ministry of Urban Development through

project No. K-14011/28/2007-UT (Centre of Excellence for Urban

Transportation )

Sheik Mohammed Ali S, Boby George and Lelitha Vanajakshi … mobility... · 2020-01-24 · Sheik...

Documents

Transcript of Sheik Mohammed Ali S, Boby George and Lelitha Vanajakshi … mobility... · 2020-01-24 · Sheik...