CN101561242B - Camshaft phase sensor - Google Patents
Camshaft phase sensor Download PDFInfo
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- CN101561242B CN101561242B CN 200910137826 CN200910137826A CN101561242B CN 101561242 B CN101561242 B CN 101561242B CN 200910137826 CN200910137826 CN 200910137826 CN 200910137826 A CN200910137826 A CN 200910137826A CN 101561242 B CN101561242 B CN 101561242B
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- shaped magnet
- soft iron
- sensing element
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Abstract
The invention discloses a camshaft phase sensor, which comprises a coaxial magnetized annular magnet; an annular soft iron is arranged inside the annular magnet and forms a magnetic circuit together with the annular magnet; a flux inductive element is arranged on one end surface of the annular magnet to measure the magnetic field intensity of the location and judge the phase position correspondingto 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
The present invention relates to a kind of vehicle sensor, be specifically related to a kind of position transducer.
Background technology
At present, the flux sensing element that is used for camshaft-signal sensor has very strict restriction for magnetic flux density, the field intensity at this place need to approach zero even for negative, therefore must design special magnetic circuit to satisfy this requirement under the state that does not have ferromagnetic object to approach.In the patent US5814985 of MMT company, utilize the ring-shaped magnet of axial charging to make its surface have a reverse magnetic field, but because the reversed magnetic field is excessively strong, make it be difficult to equally be applicable to the phase place sensing element.And in the patent US5781005 of Allegro company by add the field intensity that a cylindrical soft iron has weakened its surperficial reversed magnetic field in ring-shaped magnet inside, make it more be applicable to corresponding flux sensing element, but its measurement point narrow range, can only chip and magnetic circuit be packaged together by special package at present could practical application.Very high to the requirement of precision like this, be unfavorable for saving production cost, can't use widely.
Summary of the invention
Technical matters to be solved by this invention provides a kind of measurement mechanism of camshaft location, can produce suitable magnetic field, makes the field intensity of measurement point be applicable to corresponding sensing element, does not need to select the sensing element of special package.
In order to solve above technical matters, the invention provides a kind of camshaft phase sensor, comprising: the ring-shaped magnet of axial charging; Annular soft iron is installed in ring-shaped magnet inside, forms magnetic circuit with described ring-shaped magnet; The flux sensing element is installed in an end face of described ring-shaped magnet, measures the magnetic field intensity at this place and judges that this locates corresponding phase position.
Because the present invention can make the field intensity of measurement point be applicable to corresponding sensing element by the annular soft iron of magnet inside; Can regulate by the variation of soft iron height and internal diameter equidimension simultaneously the position of measurement point, make its application more extensive.Magnet and soft magnetic material also can be regulated available measurement point with the existing scheme of certain forms combination replacement neatly when obtaining suitable field intensity.Annular soft iron and different bench height can be regulated Distribution of Magnetic Field and field intensity.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the schematic diagram of the embodiment of the invention one;
Fig. 2 is the axial section of Fig. 1;
Fig. 3 is the magnetic field schematic diagram of the embodiment of the invention one;
Fig. 4 is the schematic diagram of the embodiment of the invention two;
Fig. 5 is the axial section of Fig. 4;
Fig. 6 is the magnetic field schematic diagram of the embodiment of the invention two.
Embodiment
Embodiment one,
As shown in Figure 1 and Figure 2, camshaft phase sensor comprises the ring-shaped magnet 1 of an axial charging; An annular soft iron 2 is installed in ring-shaped magnet 1 inside, forms a magnetic circuit with described ring-shaped magnet 1; A flux sensing element 3 is installed in an end face of described ring-shaped magnet 1, measures the magnetic field intensity at this place and judges that this locates corresponding phase position.In the present embodiment, the end face of ring-shaped magnet 1 is consistent with the end face height of annular soft iron 2, and flux sensing element 3 is installed in an end of ring-shaped magnet 1.As shown in Figure 3, the present embodiment magnetic-field measurement point range is wider, meets camshaft-signal sensor flux sensing element 3 for the requirement of magnetic flux density.
Embodiment two:
Such as Fig. 4, shown in Figure 5, camshaft phase sensor comprises: the ring-shaped magnet 1 of an axial charging; An annular soft iron 2 is installed in ring-shaped magnet 1 inside, forms a magnetic circuit with described ring-shaped magnet 1; 2 one end faces of described annular soft iron are lower than the end face of described ring-shaped magnet 1, described flux sensing element 3 is installed in the space of this magnet end face and the formation of soft iron end face, also can be installed on the magnet end face, measure the magnetic field intensity at this place and judge that this locates corresponding phase position.As shown in Figure 6, the present embodiment magnetic-field measurement point range is wider, meets camshaft-signal sensor flux sensing element 3 for the requirement of magnetic flux density.
The present invention is not limited to embodiment discussed above.Above description to embodiment is intended in order to describe and illustrate the technical scheme that the present invention relates to.Based on the apparent conversion of the present invention enlightenment or substitute and also should be considered to fall into protection scope of the present invention.Above embodiment is used for disclosing best implementation method of the present invention, so that those of ordinary skill in the art can use numerous embodiments of the present invention and multiple alternative reaches purpose of the present invention.
Claims (4)
1. a camshaft phase sensor is characterized in that, comprising:
The ring-shaped magnet of axial charging;
Annular soft iron is installed in ring-shaped magnet inside, forms magnetic circuit with described ring-shaped magnet, regulates the position of measurement point by the variation of soft iron height and internal diameter size;
The flux sensing element is installed in an end face of described ring-shaped magnet, measures the magnetic field intensity at this place and judges that this locates corresponding phase position.
2. camshaft phase sensor as claimed in claim 1 is characterized in that, described annular soft iron end face is identical with the end face of this place's ring-shaped magnet, and described flux sensing element is installed in an end of this ring-shaped magnet.
3. camshaft phase sensor as claimed in claim 1 is characterized in that, end face of described annular soft iron is lower than the end face of this place's ring-shaped magnet, and described flux sensing element is installed in the space of this magnet end face and the formation of soft iron end face.
4. camshaft phase sensor as claimed in claim 1 is characterized in that, end face of described annular soft iron is lower than the end face of this place's ring-shaped magnet, and described flux sensing element is installed on this magnet end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910137826 CN101561242B (en) | 2008-12-11 | 2009-04-21 | Camshaft phase sensor |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810044100.9 | 2008-12-11 | ||
| CN200810044100 | 2008-12-11 | ||
| CN 200910137826 CN101561242B (en) | 2008-12-11 | 2009-04-21 | Camshaft phase sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101561242A CN101561242A (en) | 2009-10-21 |
| CN101561242B true CN101561242B (en) | 2013-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910137826 Active CN101561242B (en) | 2008-12-11 | 2009-04-21 | Camshaft phase sensor |
Country Status (1)
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| CN (1) | CN101561242B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3638622A1 (en) * | 1986-11-12 | 1988-05-26 | Mannesmann Kienzle Gmbh | MAGNETIC SENSOR |
| US5229715A (en) * | 1989-04-03 | 1993-07-20 | Sanken Airpax Ltd. | Variable reluctance sensor for electromagnetically sensing the rate of movement of an object |
| DE4343612A1 (en) * | 1993-12-16 | 1995-06-22 | Uwe Dipl Ing Bluecher | Cervix elasticity determn. method for detecting premature birth |
| US5781005A (en) * | 1995-06-07 | 1998-07-14 | Allegro Microsystems, Inc. | Hall-effect ferromagnetic-article-proximity sensor |
| US5814985A (en) * | 1994-09-16 | 1998-09-29 | Moving Magnet Technologies S.A. | Incremental sensor of speed and/or position for detecting low and null speeds |
-
2009
- 2009-04-21 CN CN 200910137826 patent/CN101561242B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3638622A1 (en) * | 1986-11-12 | 1988-05-26 | Mannesmann Kienzle Gmbh | MAGNETIC SENSOR |
| US5229715A (en) * | 1989-04-03 | 1993-07-20 | Sanken Airpax Ltd. | Variable reluctance sensor for electromagnetically sensing the rate of movement of an object |
| DE4343612A1 (en) * | 1993-12-16 | 1995-06-22 | Uwe Dipl Ing Bluecher | Cervix elasticity determn. method for detecting premature birth |
| US5814985A (en) * | 1994-09-16 | 1998-09-29 | Moving Magnet Technologies S.A. | Incremental sensor of speed and/or position for detecting low and null speeds |
| US5781005A (en) * | 1995-06-07 | 1998-07-14 | Allegro Microsystems, Inc. | Hall-effect ferromagnetic-article-proximity sensor |
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| Publication number | Publication date |
|---|---|
| CN101561242A (en) | 2009-10-21 |
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