Calibration method of magnetic induction effect angle sensor

Abstract

The invention relates to a calibration method of a magnetic induction effect angle sensor, belonging to the technical field of sensors test and measurement. The method comprises a plurality of sub-calibration processes of a low-temperature segment calibration process and a high-temperature segment calibration process, wherein each sub-calibration process comprises the following steps that: for the calibration of a first calibration test point of a first chip: a calibration system controller first controls a motor to input a rotation angle into the rotation direction of the first calibration test point; the calibration system sends a rotating in-place instruction; the angle sensor collects and processes relevant data when detecting the instruction; and the calibration system rotates for a unit step length and cycles accordingly until the calibration of all calibration test points is completed after receiving the instruction. The calibration method can realize the operation inside the angle sensor, substantially improves the angle measuring precision of the magnetic induction effect angle sensor through the calibration, and is applied to the quick and accurate calibration of the magnetic induction effect angle sensor during the mass production.

Description

technical field [0001] The invention belongs to the technical field of test and measurement sensors, in particular to the calibration of a magnetic induction effect angle sensor. Background technique [0002] With the development of industrial automation, automotive electric power steering, and automotive electronic stability control, there are more and more applications of angle sensors. The magnetic induction effect has good application value and practical prospect due to its good characteristics such as non-contact, good hysteresis characteristics, and anti-environmental interference, and has been widely used in automobiles. [0003] There are many forms of magnetic induction effect angle sensors, and their basic components are as follows: figure 1 shown. It consists of a housing 1, a rotating input gear 2, one or more driven gears 3, a magnet 4 fixedly connected to the driven gears, a magnetic induction chip 5, a single-chip microcomputer 6, a power supply module 7, an...

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Problems solved by technology

[0007] There are many parameters to be calibrated, and the calibration process is relatively complicated, and the calibration compensation algorithm with good practical value is not found in existing patented inventions and papers

In 2002, Bosch company applied for the patent US 6494784B1 in the United States through three test points, which can compensate the offset of the output value of the magnetic induction chip of the magnetic induction effect angle sensor. The basic principle is to calculate the position of the center of the circle through three points on the circumference , this method can only obtain the offset, but does not involve the peak value of the output value of the magnetic induction chip, the phase difference of the output value of the magnetic induction chip, and the temperature coefficient of the offset

[0034] The calibration formula given in the chip application manual is only for a single magnetic induction chip, and does not consider the temperature change during the calibration process. There is no explanation for the calibration of a complete angle sensor composed of multiple magnetic induction chips.

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