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Camshaft phase sensor

A phase sensor and camshaft technology, which is applied in the field of vehicle sensors, can solve the problems that the reverse magnetic field is too strong, it is difficult to apply phase sensing elements, and it cannot be widely used.

Inactive Publication Date: 2009-10-21
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In MMT's patent US5814985, the axially magnetized ring magnet is used to make the surface have a reverse magnetic field, but because the reverse magnetic field is too strong, it is also difficult to apply to the phase induction element
In Allegro's patent US5781005, a cylindrical soft iron is added inside the ring magnet to weaken the field strength of the reverse magnetic field on its surface, making it more suitable for the corresponding magnetic flux sensing element, but its measuring point range is very narrow. At present Only by packaging the chip and the magnetic circuit together through a special package can it be practically applied
This requires high precision, which is not conducive to saving production costs and cannot be widely used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 , figure 2 As shown, the camshaft phase sensor includes an axially magnetized ring magnet 1; a cylindrical soft iron 2 is installed inside the ring magnet 1; a special-shaped soft iron 3 with a raised edge 7 and a hole 5 in the middle is installed on an end face of the magnet, The magnet, the cylindrical soft iron 2 and the special-shaped soft iron 3 together form a magnetic circuit; the magnetic flux sensing element 4 is installed on the end face of the special-shaped soft iron 3 to measure the magnetic field strength there and determine the corresponding phase position there. Such as figure 2 As shown, in this embodiment, the end face of the ring magnet 1 is consistent with the end face height of the cylindrical soft iron 2, and the special-shaped soft iron 3 includes an edge protrusion 7 with a cross section at a right angle, with a hole 5 in the middle, and the edge of the protrusion 7 surrounds into space6. The magnetic flux induction element ...

Embodiment 2

[0020] Such as Figure 4 As shown, the camshaft phase sensor of this embodiment includes an axially magnetized ring magnet 1; a cylindrical soft iron 2 is installed inside the ring magnet 1; a protruding edge 7 and a special-shaped soft iron 3 with a hole 5 in the middle are installed on the inside of the magnet. One end face, the magnet, the cylindrical soft iron 2 and the special-shaped soft iron 3 together form a magnetic circuit; the magnetic flux sensing element 4 is installed on the end face of the special-shaped soft iron 3, and the magnetic field strength at this place is measured and the phase corresponding to this place is judged Location. Different from the first embodiment, the edge of the protrusion 7 of the special-shaped soft iron 3 in this embodiment is arc-shaped.

Embodiment 3

[0022] Such as Figure 5 As shown, the camshaft phase sensor of this embodiment includes an axially magnetized ring magnet 1; a cylindrical soft iron 2 is installed inside the ring magnet 1; the edge section is H-shaped, and a special-shaped soft iron 3 with a hole 5 in the middle is installed on the magnet One end face of the magnet, the cylindrical soft iron 2 and the special-shaped soft iron 3 together form a magnetic circuit; the magnetic flux sensing element 4 is installed on the end face of the special-shaped soft iron 3, and the magnetic field intensity at this place is measured and the corresponding phase position. The difference from the first embodiment is that the edge of the protrusion 7 of the special-shaped soft iron 3 in this embodiment is H-shaped, and there are both upward protrusions 7 and downward protrusions 7, and the downward protrusions 7 surround the ring magnet1.

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Abstract

The invention discloses a camshaft phase sensor, which comprises a coaxial magnetized annular magnet; a profiled soft iron provided with a hole in the middle is arranged on one end surface of the annular magnet; the annular magnet and the profiled magnet form a magnetic circuit together; a flux inductive element is arranged on the end surface of the profiled soft iron to measure the magnetic field intensity of the location and judge the phase position corresponding to the location. The camshaft phase sensor can generate reasonable magnetic fields to lead the field intensity of the measured points to be suitable for the corresponding inductive element and reduce the requirements on the sealing precision of the sensor.

Description

technical field [0001] The invention relates to a vehicle sensor, in particular to a position sensor. Background technique [0002] At present, the magnetic flux sensing element used in the camshaft sensor has a very strict limit on the magnetic flux intensity. In the state where there is no ferromagnetic object approaching, the field intensity there needs to be close to zero or even negative, so a special magnetic circuit must be designed. to meet this requirement. In MMT's patent US5814985, an axially magnetized ring magnet is used to make the surface have a reverse magnetic field, but because the reverse magnetic field is too strong, it is also difficult to apply to the phase induction element. In Allegro's patent US5781005, a cylindrical soft iron is added inside the ring magnet to weaken the field strength of the reverse magnetic field on its surface, making it more suitable for the corresponding magnetic flux sensing element, but its measuring point range is very narr...

Claims

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Application Information

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IPC IPC(8): G01D5/12G01R33/02
Inventor 王春健陈雁程捷
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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