Abstract
This paper shows a report of over three years of intensive work on application of a 3-axis anisotropic magnetoresistive sensor with I2C interface for measurement of magnetic flux density distribution of automotive wheels. The work was undertaken to answer the question of whether is a possibility to effectively apply low-cost magnetic sensors with serial interface to measure the magnetic field surrounding the automotive wheel or tire. Two measurement techniques were discussed: Magnetic profile (1D) and magnetic surface measurement (2D) over tread, and also gear associated with the sensor, as well as its design, layout, operation, and control technique during (1D) and (2D) measurements. Three experiments were performed to asses accuracy and repeatability concerning component and resultant magnetic circumferential profiles and also magnetic surface. Differences between measurement outcomes in experiment were assessed. The results show that accuracy and repeatability lays below maximum admissible uncertainty declared by the producer. This proves directly that there is no measurable influence of motors, gear, operation, or measurement procedure on results obtained by magnetic sensors, and indirectly, that the assumed requirements regarding gear design and parameters are correct, and measurement of magnetic flux density distribution of automotive wheels and tires using (1D) and (2D) techniques is possible using a 3-axis anisotropic magnetoresistive sensor with I2C interface.
Highlights
The “steel belt” term comes rather from fact that this element acts as a kind of belt, which buckles the tire insides and keeps it in shape
The power cables must be distant or shielded. This setup assumes that the magnetic field inducted by motor during operation will be lower or equal to sensor resolution at sensor location and weak enough to not induce additional magnetic field which can interfere with measurements results
The standard deviation is at least 3 times smaller than the highest differences, but still smaller than that declared by the producer for the sensor uncertainty. This proves directly that there is no measurable influence of motors, gear, operation, or measurement procedure on results obtained by magnetic sensors, and indirectly, that the assumed requirements regarding gear design and parameters are correct
Summary
They must be extracted from measurements using signal analysis technique (which is out of the scope of this article) At this moment, it is vital to find out what process creates which magnetic field distribution, and after that to determine or estimate some physical characteristics of the tire. It is vital to find out what process creates which magnetic field distribution, and after that to determine or estimate some physical characteristics of the tire To finalize this vital part of work, first a proper measuring technique, as well as measuring approach, gear, and equipment, must be selected. The profile and surface are measured above steel belt (and tread) in automotive tire
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