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Measuring system and method of a cyclic movement of a ferromagnetic part

A technology of ferromagnetic components and movement, applied in the field of measurement systems, can solve problems such as complex and amplitude interference measurement values

Inactive Publication Date: 2011-07-27
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such encoders must be isolated from soil that distorts measurements
This is complicated to implement
[0005] However, translating known magnetic systems for wheels into the evaluation of the motion of other vehicle elements, in particular the analysis of the motion of the rotating elements of the engine, is problematic because of the variable magnetic field (unrelated to the desired rotational measurement of the component , which has a non-negligible amplitude) interferes with the measured value of the magnetic field

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  • Measuring system and method of a cyclic movement of a ferromagnetic part
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  • Measuring system and method of a cyclic movement of a ferromagnetic part

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Embodiment Construction

[0033] The same components are indicated by the same reference numerals in different drawings. For clarity, only those components and steps useful for the understanding of the present invention are shown and will be described. In particular, the actual molding of the magnetometer that can provide information along one or more axes is not described in detail, and the present invention is compatible with commonly used magnetometers. In addition, the utilization of the information related to the analyzed cyclic motion is not described in detail, and the present invention is also compatible with the conventional use of the measured values ​​(speed, position, etc.) of the components performing the cyclic motion.

[0034] figure 1 It is a simplified top view of a car 1 equipped with a system according to an embodiment of the invention for analyzing the rotational movement of the ferromagnetic parts of the engine.

[0035] In this example, it is desirable to estimate the camshaft of the ...

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Abstract

The invention relates to a measuring system and a measuring method of a cyclic movement of a ferromagnetic part. The system for measuring the cyclic movement of a ferromagnetic part subject to noise disturbance of at least one power supply with an alternating current component comprises at least one magnetometer sensitive to a moving part, an image sensor of the current in the power source, a calculation unit for calculating estimation of noise related to the electrical source based on a signal measured by the magnetometer and a subtraction unit for subtracting the estimation to the measured signal.

Description

Technical field [0001] The present invention generally relates to a measurement system that uses the magnetic field generated by a ferromagnetic component to estimate the magnitude (velocity, position, etc.) related to the cyclic movement of the ferromagnetic component. More specifically, the invention relates to measurements related to the rotational movement of ferromagnetic components. Background technique [0002] It is known to use magnetic field measurement to determine the speed of car wheels. For example, the document EP-A-0828161 describes a detection method and device in which a magnetic sensor is arranged close to the wheel to use the ferromagnetic properties of the magnetic sensor and infer the rotation speed of the wheel from it. In order to reduce the influence of other magnetic sources close to the wheels (chassis, doors, etc.), the signals from multiple sensors placed close to the wheels are measured differentially. Therefore, the field component originating fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/487
CPCG01B7/30G01D5/24476G01R33/00G01B7/14
Inventor A·勒戈夫R·布兰佩因
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES