Weigh-In-Motion and Direct Enforcement System
The direct enforcement system consists
of weigh-in-motion inspection station and monitoring center, through PL (private
line) or internet.
The monitoring site is composed of data
acquisition equipment (WIM sensor, ground loop, HD camera, smart ball camera)
and data manipulation equipment (WIM controller, vehicle detector, hard disk
video, front-end equipment manager) and information display equipment etc.
Monitoring center consists of application server, database server, management
terminal, HD decoder, display screen hardware and other data platform software.
Each monitoring site
collects and processes the load, license plate number, image, video and other
data of the vehicles passing on the road in real time, and transmits the data to the
monitoring center through the optical fiber network.
Weigh-in-motions
system working principle
The
following is a schematic diagram of how the system works.
1）Dynamic weighing
Dynamic weighing utilizes load cells laid on the road to sense the pressure when the vehicle axle pressure on it.
When vehicle drive in the ground loop installed under the road, it is ready to be weighed. When the vehicle tire contacts the load cell, the sensor
begins to detect the wheel pressure, generates an electrical signal
proportional to the pressure, and after the signal is amplified by the data
matching terminal, the axle load information is calculated by the weighing
controller.
While vehicles left the ground loop, the WIM
controller calculate the number of
axles, axles weight
and vehicle gross weight, and the weighing
is completed, sent
this vehicle load data to front of manager equipment. While WIM controller can
detect both vehicle speed and
vehicle type.
2）vehicle image capture/vehicle license plate
recognition
Vehicle license
plate recognition use HD camera to capture vehicle images for license plate
number recognition. When the vehicle enters the ground loop, that
triggers HD camera in the
direction of the front and rear of the vehicle to capture the head, back and
side of the vehicle, at
the same time, with the fuzzy recognition
algorithm to
get the license plate number,
license plate color and vehicle color etc. HD camera can also assist in detecting vehicle type and driving speed.
3）Video acquisition
The integrated
ball camera installed on the lane monitoring pole collects the vehicle driving video data in real time and sends it
to the monitoring center.
4）Data fusion matching
Data processing
and storage subsystem receives from WIM controller subsystem, vehicle license
plate recognition/capture subsystem and the vehicle load data, vehicle image
data and video data of the video monitoring subsystem matches and binds the
vehicle load and image data with the license plate number, and at the same time
judge whether the vehicle is overloaded and overrun according to the load standard threshold.
5）overrun & overload reminder
For the overrun
and overload vehicles, the license plate number and overload data sent to the
variable information board display, reminding and inducing the driver to drive
the vehicles away from the main road and accept the treatment.
The management department can set vehicle overload and
overload monitoring points on roads and bridges according to management needs.
The typical equipment deployment mode and connection relationship in one
direction of monitoring points are shown in the following figure.
Schematic diagram of typical deployment of the system
The system deployment is divided into two parts: the inspection
site and the monitoring center, and the two parts are interconnected through
the private line network or the Internet provided by the operator.
（1）On site detect
The inspection site is divided into two sets according to
the two driving directions, and each set has four rows of quartz pressure
sensors and two sets of ground sensing coils respectively laid on the two lanes
of the road.
Three F poles and two L poles are erected on the side of
the road. Among them, three F bars are installed with weighing inspection
prompt boards, information display guidance screens and unloading guide prompt
boards, respectively. On the two L bars on the main road are respectively
installed with 3 front-end snapshot cameras, 1 side snapshot camera, 1
integrated ball camera, 3 fill lights, and 3 rear snapshot cameras, 3 fill
lights.
1 WIM controller, 1industrial computer, 1 vehicle
detector, 1 hard disk video recorder, 1 24-port switch, a fiber optic
transceiver, power supply and lightning protection grounding equipment are respectively
deployed in the roadside control cabinet.
8 high-definition cameras, 1 integrated dome camera, 1 WIM
controller, and 1 industrial computer are connected to a 24-port switch through
a network cable, and the industrial computer and the vehicle detector are
directly connected. The information display guide screen is connected to the
24-port switch through a pair of fiber optic transceivers
（2）Monitoring Center
The monitoring center deploys 1 switch, 1 database
server, 1 control computer, 1 high-definition decoder and 1 set of large
screens.
Application process design
1) The integrated intelligent ball camera collects the road video information
of the inspection point in real time, stores it in the hard disk video
recorder, and sends the video stream to the monitoring center in real time for
real-time display.
2) When there is a vehicle on the road entering the ground loop in the front
row, the ground loop generates an oscillating current, which triggers the
license plate recognition/snapshot camera to take pictures of the front, rear
and side of the vehicle, and at the same time informs the weighing system to
prepare to start weighing;
3) When the vehicle wheel touches the WIM sensor, the quartz pressure sensor
starts to work, collects the pressure signal generated by the wheel, and sends
it to the weighing instrument for processing after being amplified by the
charge;
4) After the weighing instrument performs integral conversion and
compensation processing on the pressure electrical signal, the information such
as the axle weight, gross weight, and number of axles of the vehicle is
obtained, and sent to the industrial computer for comprehensive processing;
5) The license plate recognition/capture camera recognizes the license plate
number, license plate color and body color of the vehicle. The results of the
identification and the photos of the vehicle are sent to the industrial
computer for processing.
6) The industrial computer matches and binds the data detected by the
weighing instrument with the vehicle license plate number and other
information, and compares and analyzes the vehicle load standard in the
database to determine whether the vehicle is overloaded or not.
7) If the vehicle is not overloaded, the above information will be stored in the
database and sent to the monitoring center database for storage. At the same
time, the vehicle license plate number and load information will be sent to the
information guidance LED display for vehicle information display.
8) If the vehicle is overloaded, the road video data within a period of time
before and after the weighing will be searched from the hard disk video
recorder, bound to the license plate, and sent to the monitoring center
database for storage. Go to the information guidance LED display to display the
vehicle information, and induce the vehicle to deal with it immediately.
9)
Statistical analysis of
on-site monitoring data, generating statistical reports, providing user
inquiries, and displaying on the large splicing screen, at the same time, the
vehicle overload information can be sent to the external system to facilitate
law enforcement processing.
Interface design
There are internal and external interface relationships
between the various subsystems of the direct enforcement system for vehicle
overloading, as well as between the system and the external monitoring center
system. The interface relationship is shown in the figure below.
the internal and external interfaces relationship of the
system
Internal interface design:
there has 5 types of the direct enforcement system for
vehicle overloading.
（1） Interface between weighing subsystem and information processing and
storage subsystem
The interface between weighing subsystem and information
processing and storage subsystem mainly deals with bidirectional data flow. The
information processing and storage subsystem sends equipment control and
configuration instructions to the weighing subsystem, and the weighing
subsystem sends the measured vehicle axle weight and other information to the
information processing and storage subsystem for processing.
（2）Interface between license
plate recognition/capture subsystem and information processing and storage subsystem
The interface between the license plate recognition/capture
subsystem and the information processing and storage subsystem mainly deals
with bidirectional data flow. Among them, the information processing and
storage subsystem sends device control and configuration instructions to the high-definition
license plate recognition/capture subsystem, and the high-definition license plate
recognition/capture subsystem sends the recognized vehicle license plate,
license plate color, vehicle color and other data to the information processing
and capture system for processing.
（ 3 ）Interface between video
monitoring subsystem and information processing and storage subsystem
The interface between the video monitoring subsystem and
the information processing and storage subsystem mainly deals with
bidirectional data flow. The information processing and storage subsystem sends
equipment control and configuration instructions to the video monitoring
subsystem, and the video monitoring subsystem sends data such as law enforcement
on-site video information to the information processing and storage subsystem for
processing.
（4）Interface of Information display
guidance subsystem with Information Processing and Storage Subsystem
The interface between the information display guidance subsystem
with the information processing and storage subsystem mainly deals with one-way
data flow. The information processing and storage subsystem sends data such as
the license plate, load capacity, overweight and warning and guidance
information of vehicles passing on the road to the information display guidance
subsystem.
（5）Information Processing
and Storage Subsystem and Data Management Subsystem Interface
The interface between the information processing and
storage subsystem and the data management subsystem of the monitoring center
mainly deals with bidirectional data flow. Among them, the data management
subsystem sends basic data such as data dictionary and control instruction data
of field equipment to the information processing and storage subsystem, and the
data processing and storage subsystem sends the vehicle weight information, overload
data packets, live video data and vehicle images, license plates and other data
information collected on site to the data management subsystem.
External interface design
The vehicle overload direct enforcement system can
synchronize the real-time data of the inspection site to other business
processing platforms, and can also synchronize the vehicle overload information
to the law enforcement system as the basis for law enforcement.
Enviko Technology Co.,Ltd
E-mail: info@enviko-tech.com
https://www.envikotech.com
Chengdu Office: No. 2004, Unit 1, Building 2, No. 158,
Tianfu 4th Street, Hi-tech Zone, Chengdu
Hong Kong Office: 8F, Cheung Wang Building, 251 San Wui
Street, Hong Kong
Factory: Building 36, Jinjialin Industrial Zone,
Mianyang City, Sichuan Province
Comments
Post a Comment