Design a Weight in Motion system

Bui Trung Kien
Ho Chi Minh University of Technology
Ho Chi Minh City, Viet Nam
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Entry date: 28-Mar-2015
Final Submission: 01-Jan-2016
Weigh in Motion (WIM) systems aim at the dynamic weighing of vehicles through a reasonable number of measurement stations placed along the track. As researcher about this system, my team wants to design and build a system to estimate the costs & traffic management. I hope the system module will be useful.

Project details

WIM introduction

Weigh-in-motion systems do not actually weigh the axles crossing the sensors, instead sensors measure the dynamic force present when each axle crosses the sensing unit. The entire process is a result of several different phenomena acting simultaneously. The movement of the suspension, body and the load, and an unbalance in these various components, will create vertical and lateral oscillation of the vehicle. Also, speed and ride quality of the surface and pavement conditions produce vibrations in the suspension and the vehicle body. These factors can increase errors in the sensing units and data analysis. These conditions result in the dynamic forces being observed by the weigh sensors, which therefore result in a weight either greater or less than the true static weight. Such variations can be as much as plus or minus 30-40% of the static weight. [1]

System Diagram

System Diagram

 The system will solve these tasks:

  • Control loops which will detect to set a flag when vehicle go to the system.
  • Process data from sensors. The data includes wheel load, axle group load, gross vehicle weight, velocity.
  • Analyze Image. The system will recognize number plates to find vehicle ID.
  • User Interface to support good condition to control system. People don't need to go to the station but they can control through server.
  • ...


[1] Implementation of Weigh-in-Motion (WIM) Systems :http://www.state.nj.us/transportation/refdata/research/reports/FHWA-NJ-2009-001.pdf

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