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Sensors 2007, 7(8), 1530-1544;

Design of a Capacitive Flexible Weighing Sensor for Vehicle WIM System

State Key Lab. of Industrial Control Technology, Institute of Automation Instrumentation, Zhejiang University, Hangzhou 310027, Zhejiang province, China
China JiLiang University, Hangzhou 310018, Zhejiang province, China
Author to whom correspondence should be addressed.
Received: 28 June 2007 / Accepted: 3 July 2007 / Published: 17 August 2007
PDF [619 KB, uploaded 21 June 2014]


With the development of the Highway Transportation and Business Trade, vehicle weigh-in-motion (WIM) technology has become a key technology and trend of measuring traffic loads. In this paper, a novel capacitive flexible weighing sensor which is light weight, smaller volume and easy to carry was applied in the vehicle WIM system. The dynamic behavior of the sensor is modeled using the Maxwell-Kelvin model because the materials of the sensor are rubbers which belong to viscoelasticity. A signal processing method based on the model is presented to overcome effects of rubber mechanical properties on the dynamic weight signal. The results showed that the measurement error is less than ±10%. All the theoretic analysis and numerical results demonstrated that appliance of this system to weigh in motion is feasible and convenient for traffic inspection. View Full-Text
Keywords: weigh-in-motion; flexible; capacitance; Maxwell-Kelvin model; viscoelasticity. weigh-in-motion; flexible; capacitance; Maxwell-Kelvin model; viscoelasticity.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Cheng, L.; Zhang, H.; Li, Q. Design of a Capacitive Flexible Weighing Sensor for Vehicle WIM System. Sensors 2007, 7, 1530-1544.

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