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Validation of Multi-Frequency Inductive-Loop Measurement System for Parameters of Moving Vehicle Based on Laboratory

Zbigniew Marszalek1, Krzysztof Duda1

  • 1Department of Measurement and Electronics, AGH University of Krakow, 30 Mickiewicz Avenue, 30-059 Krakow, Poland.

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Summary

This study introduces a validated system for measuring vehicle parameters using inductive-loop (IL) sensors and vehicle magnetic profile (VMP) waveforms. Laboratory testing confirmed accurate measurements, with errors under 4.3 cm for vehicle dimensions.

Keywords:
front overhanglaboratory test bedmulti-frequency impedance measurementrear overhangslim inductive-loop sensorspeedvehicle axlevehicle lengthvehicle magnetic profile (VMP)vehicle parameterswheelbase

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Area of Science:

  • * Automotive Engineering
  • * Sensor Technology
  • * Metrology

Background:

  • * Vehicle parameter measurement systems are crucial for traffic analysis and vehicle dynamics.
  • * Real-world testing conditions present challenges due to uncontrolled variables like vehicle speed.
  • * Existing inductive-loop (IL) sensor systems require robust validation methods.

Purpose of the Study:

  • * To present and validate a novel system for measuring vehicle parameters (speed, wheelbase, length, overhangs).
  • * To develop and utilize a controlled laboratory test bed (LTB) for system validation.
  • * To assess the accuracy of the measurement system under diverse speed conditions.

Main Methods:

  • * Employed four inductive-loop (IL) sensors (two slim, two wide) for impedance measurements at three carrier frequencies.
  • * Developed a 1:50 scale vehicle model and a laboratory test bed (LTB) replicating a real road test bed (RTB).
  • * Validated the system across a speed range of 10-150 km/h in controlled laboratory conditions.

Main Results:

  • * Vehicle parameters were determined from vehicle magnetic profile (VMP) waveforms derived from IL impedance measurements.
  • * The laboratory test bed (LTB) successfully simulated real-world measurement scenarios.
  • * Maximum errors in estimating full-scale vehicle body parameters did not exceed 4.3 cm.

Conclusions:

  • * The developed IL sensor system accurately measures vehicle parameters.
  • * The laboratory test bed (LTB) provides a reliable platform for validating vehicle measurement systems.
  • * The system demonstrates high precision suitable for automotive applications.