Car dynamic weighing device

Abstract

The invention discloses a car dynamic weighing device, which comprises a weighting platform, a broadband light source, a fiber bragg grating strain sensor, a fiber bragg grating temperature sensor, afiber bragg grating sensor demodulation system, an infrared car separator, and a controller. The fiber bragg grating strain sensor is used for sensing deformation of the weighing platform after receiving an optical signal to obtain a deformation optical signal, the fiber Bragg grating temperature sensor is used for sensing the environment temperature of the weighing platform after receiving the optical signal to obtain a temperature optical signal, the fiber bragg grating sensor demodulation system is used for filtering out the temperature optical signal doped in the deformation optical signal, and demodulating the deformation optical signal after filtering to obtain the weight of shafts of a car, the infrared car separator is used for tracking and confirming the whole process of the car from entering a test area to leaving the test area, emitting a start signal when the car enters the test area, and emitting an end signal when the car leaves the test area; and the controller is used for receiving the weight of the shafts of the same car in the test area to obtain the weight of the car. The car dynamic weighing device can improve the weighting accuracy.

Description

technical field [0001] The invention relates to the technical field of automobile weighing, in particular to an automobile dynamic weighing device. Background technique [0002] At present, the dynamic weighing of road truck scales in China usually uses various truck scales such as resistance strain gauges, piezoelectric types, and capacitive types, but there are large errors in measurement accuracy, frequent adjustments and calibrations, large volume and weight, and the need for professionals. Installation and maintenance, poor environmental adaptability, susceptible to electromagnetic, temperature, humidity, impact interference and other defects. [0003] In recent years, certain developments and achievements have been made in the detection technology of weighing, especially the detection system developed by applying the sensor measurement theory has achieved a new breakthrough, and the measurement speed and measurement accuracy have been improved to a large extent. For e...

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Problems solved by technology

However, this patent needs to arrange the fiber grating sensor on the multi-layer structure of the bearing device for weighing, the structure is more complicated, the installation is more complicated, and the test time is short, and the influence of different temperatures on the mechanical properties of the bearing device itself is not considered, that is, there is no Considering the indirect influence of temperature on weighing accuracy, since FBG sensors are divided into strain sensors and temperature sensors, the FBG wavelength of the strain sensor is sensitive to temperature and strain at the same time, that is, the temperature and strain simultaneously cause the FBG coupling wavelength to move, so that through the measurement fiber Grating-coupled wavelength shift cannot distinguish between temperature and strain. Temperature sensors can only measure changes in temperature in the environment and are not affected by strain changes. If only strain sensors are installed in the system, there is no way to monitor temperature variables separately, so this One technology has disadvantages such as low weighing accuracy

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