CN102565448B - Automobile wheel speed sensor - Google Patents
Automobile wheel speed sensor Download PDFInfo
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- CN102565448B CN102565448B CN201210011605.1A CN201210011605A CN102565448B CN 102565448 B CN102565448 B CN 102565448B CN 201210011605 A CN201210011605 A CN 201210011605A CN 102565448 B CN102565448 B CN 102565448B
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- temperature line
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Abstract
The invention discloses a novel automobile wheel speed sensor, which comprises a plug, a high temperature wire, a magnet, a reluctance sensor chip and an additional capacitor. The reluctance sensor chip, the magnet and the additional capacitor are connected in parallel and packaged inside a sealing assembly, the ends of the reluctance sensor chip are exposed out of the sealing assembly, two ends of the high temperature wire are respectively connected with a pin of the plug and the reluctance sensor chip, and a fixing structure is arranged on the middle portion of the high temperature wire to be fixed with an automobile body. The novel automobile wheel speed sensor uses a reluctance sensor, a giant magneto resistive (GMR) effect sensor is sensitive to subtle changes in the magnetic field, and accordingly the location and displacement of gear ring rotation can be measured accurately. Compared with Hall effect sensors and magneto-electric sensors, GMR chips have strong output signals.
Description
Technical field
The present invention relates to sensor technology, be particularly suitable for the wheel speed sensors of anti-locking system for car.
Background technology
Anti-lock braking system in automobiles relates to the security of running car, the wheel speed sensors that particularly used, and the quality of its performance directly has influence on the quality of automobile brake perfrmance.The wheel speed sensors that existing anti-lock braking system in automobiles is used adopts magneto-electric type wheel speed sensor mostly.The shortcoming of this wheel speed sensors is that structure and manufacturing processing technic are complicated, and anti-electromagnetic interference capability is poor, and when vehicle rotating speed output signal just during higher than a certain rotating speed, when rotating speed is fast, frequency response is insensitive.In order to overcome the shortcoming of this kind of sensor, start at present to adopt hall sensor, this kind of sensor output signal amplitude is constant, and frequency response is high, and anti-electromagnetic interference capability is strong, and also exportable signal under the utmost point slow-speed of revolution, has improved accuracy of measurement and reliability.But the chip technology adopting is monopolized by overseas enterprise, chip is external import, makes automobile wheel speed sensor cost high.
Summary of the invention
Technical matters to be solved by this invention is just to provide a kind of novel automobile wheel speed sensor, simple in structure, signal stabilization, effective anti-electromagnetic interference (EMI), frequency response sensitivity, with low cost, stable performance.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of novel automobile wheel speed sensor, it is characterized in that: comprise a plug, a higher temperature line, a magnet, a magnetoresistive transducer chip and an additional capacitor, described magnetoresistive transducer chip, magnet is in parallel with additional capacitor and be packaged in seal assembly inside, seal assembly is exposed in magnetoresistive transducer chip end, higher temperature line two ends are contact pin and the magnetoresistive transducer chip of attachment plug respectively, and fixed sturcture is set at higher temperature line middle part and body of a motor car is fixed.
As preferably, the end of described seal assembly outer most surrounding magnetoresistive transducer chip exposed is provided with an annular groove mounting O-shaped rings.
As preferably, described magnetoresistive transducer chip xsect is square, magnetoresistive transducer chip and higher temperature line welding, the angle within the scope of 105 °～115 ° of magnetoresistive transducer chip center line and the existence of higher temperature line axis.
As preferably, described fixed sturcture is at least two sleeve pipe and at least two buckles that are installed on higher temperature line that are socketed on higher temperature line.
The present invention adopts magnetoresistive transducer (being GMR effect sensor), and GMR effect sensor is very sensitive for the little variation in magnetic field, thereby can measure accurately position and displacement that gear ring rotates.GMR chip has stronger output signal with respect to hall effect sensor and magnetoelectric sensor.Frequency response range of the present invention is 0～1MHz, and working range is far away higher than magnetoelectric sensor and hall sensor.Thereby simple in structure, signal stabilization, effective anti-electromagnetic interference (EMI), frequency response are responsive, cost is low, can effectively improve the stability of wheel speed sensors.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Fig. 1 is reluctance type automobile wheel speed sensor schematic diagram of the present invention.
Embodiment
As shown in Figure 1, embodiment for automobile wheel speed sensor of the present invention, comprise a plug, a higher temperature line 13, a magnet, a magnetoresistive transducer chip 14 and an additional capacitor, described magnetoresistive transducer chip, magnet is in parallel with additional capacitor and be packaged in seal assembly inside, seal assembly is exposed in magnetoresistive transducer chip end, higher temperature line two ends are contact pin 3 and the magnetoresistive transducer chip of attachment plug respectively, and fixed sturcture is set at higher temperature line middle part and body of a motor car is fixed.The end that described seal assembly outer most surrounding magnetoresistive transducer chip 14 exposes is provided with an annular groove mounting O-shaped rings 15.Described magnetoresistive transducer chip 14 xsects are square, 13 welding of magnetoresistive transducer chip and higher temperature line, the angle within the scope of 105 °～115 ° of magnetoresistive transducer chip center line and the existence of higher temperature line axis.Described fixed sturcture is at least two sleeve pipe and at least two buckles that are installed on higher temperature line that are socketed on higher temperature line 13.
Described plug comprises an edge connector headgear 1, and edge connector headgear 1 inside is fixed with contact pin 3, top mounting receptacle overcoat 2, contact pin 3 and higher temperature line 13 welding, in No. 1 plug plug 4 for fixing plug pin 3 position in edge connector head 1 cover.Baffle plate 5 is for fixing plug pin 3.In No. 2 plugs, plug 6 is for the fixing position of higher temperature line 13.Plug back seat 7 and 1 assembling of edge connector headgear, cannot be along moving axially for filling in 6 in polarized plug.The large end of plug cover for seat 8 is nested together with plug cover for seat 1, and small end is enclosed within on higher temperature line 13.No. 1 buckle 9 is fixed on No. 2 sleeve pipes 10, and No. 2 sleeve pipe 10 fixed covers are on higher temperature line 13.No. 1 sleeve pipe 11 fixed covers are on higher temperature line 13.No. 2 buckles 12 are fixed on the sleeve pipe identical with No. 2 sleeve pipes 10, and sleeve pipe and higher temperature line 13 are fixing.Seal assembly inside is packaged with magnetoresistive transducer chip 14, and there is an annular groove outside, for mounting O-shaped rings 15.Magnetoresistive transducer 14 xsects are square, and with higher temperature line 13 welding, its center line and higher temperature line 13 axis exist an angle.
Design feature of the present invention is in seal assembly, to be sealed with magnet, magnetoresistive transducer chip, additional capacitor.Magnetoresistive transducer core, flat thin magnet are in parallel with additional capacitor.
Plug is connected with the socket being arranged on automobile, and vehicle wheel rotational speed signal is sent to ECU (Electrical Control Unit).Magnetoresistive transducer chip utilizes giant magnetoresistance effect to make.When the magneto-resistor of some magnetic or alloy material sharply reduces under certain magnetic field effect, and its resistance change rate sharply increases.Magnetoresistive transducer chip is packaged together and is formed by GMR element and magnet, and GMR element is between magnet and a gear ring.When gear ring rotates, the distribution in magnetic field will change, thereby in GMR element, produce corresponding digitizing square-wave signal.Electric capacity is attempted by the both positive and negative polarity pin of GMR chip, for absorbing the outside high-frequency electromagnetic undesired signal producing.
After installing, sensor seal assembly of the present invention is positioned at the below of gear ring.When gear ring rotates, cause that the Distribution of Magnetic Field through magnetoresistive transducer chip changes, thereby produce the digitizing square-wave signal that represents accordingly wheel speed in magnetoresistive transducer chip.Electric capacity is attempted by the both positive and negative polarity pin of GMR chip, for absorbing the outside high-frequency electromagnetic undesired signal producing.
Claims (3)
1. a novel automobile wheel speed sensor, it is characterized in that: comprise a plug, one higher temperature line (13), one magnet, one magnetoresistive transducer chip (14) and an additional capacitor, described plug comprises an edge connector headgear, edge connector headgear inside is fixed with contact pin, edge connector headgear top mounting receptacle overcoat, contact pin and higher temperature line welding, in the first plug, plug is for the position of fixing plug pin in edge connector headgear, baffle plate is for fixing plug pin, in the second plug, plug is used for the fixedly position of higher temperature line, plug back seat and the assembling of edge connector headgear, being used for locating the interior plug of the second plug cannot be along moving axially, the large end of plug cover for seat and edge connector headgear are nested together, small end is enclosed within on higher temperature line, the first buckle is fixed on the second sleeve pipe, the second sleeve pipe fixed cover is on higher temperature line, the first sleeve pipe fixed cover is on higher temperature line, the second buckle is fixed on the 3rd sleeve pipe identical with the second sleeve structure, the 3rd sleeve pipe and higher temperature line are fixed, described magnetoresistive transducer chip, magnet is in parallel with additional capacitor and be packaged in seal assembly inside, seal assembly is exposed in magnetoresistive transducer chip end, higher temperature line two ends are contact pin (3) and the magnetoresistive transducer chip of attachment plug respectively, and fixed sturcture is set at higher temperature line middle part and body of a motor car is fixed.
2. a kind of novel automobile wheel speed sensor according to claim 1, is characterized in that: the end that described seal assembly outer most surrounding magnetoresistive transducer chip (14) exposes is provided with an annular groove mounting O-shaped rings (15).
3. a kind of novel automobile wheel speed sensor according to claim 1, it is characterized in that: described magnetoresistive transducer chip (14) xsect is square, magnetoresistive transducer chip and higher temperature line (13) welding, the angle within the scope of one 105 °～115 ° of magnetoresistive transducer chip center line and higher temperature line axis existence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210011605.1A CN102565448B (en) | 2012-01-14 | 2012-01-14 | Automobile wheel speed sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210011605.1A CN102565448B (en) | 2012-01-14 | 2012-01-14 | Automobile wheel speed sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102565448A CN102565448A (en) | 2012-07-11 |
| CN102565448B true CN102565448B (en) | 2014-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210011605.1A Active CN102565448B (en) | 2012-01-14 | 2012-01-14 | Automobile wheel speed sensor |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490110A (en) * | 2014-09-15 | 2016-04-13 | 瑞安市麦格电子科技有限公司 | Abs sensor plug |
| CN106324288B (en) * | 2016-09-28 | 2022-08-16 | 苏州科技大学 | Testing device and testing method for wheel speed sensor |
| CN110344148B (en) * | 2019-07-30 | 2020-12-18 | 中原工学院 | Magnetoelectric spinning spindle power sensor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5327077A (en) * | 1992-01-06 | 1994-07-05 | Murata Mfg. Co. Ltd. | Device including an even number of equally spaced magneto-resistors for detecting rotation or straight motion of a moving body |
| CN102119334A (en) * | 2008-08-11 | 2011-07-06 | Ntn株式会社 | Rotation sensor |
| CN202453364U (en) * | 2012-01-14 | 2012-09-26 | 浙江兆丰机电股份有限公司 | Novel automotive wheel speed sensor |
-
2012
- 2012-01-14 CN CN201210011605.1A patent/CN102565448B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5327077A (en) * | 1992-01-06 | 1994-07-05 | Murata Mfg. Co. Ltd. | Device including an even number of equally spaced magneto-resistors for detecting rotation or straight motion of a moving body |
| CN102119334A (en) * | 2008-08-11 | 2011-07-06 | Ntn株式会社 | Rotation sensor |
| CN202453364U (en) * | 2012-01-14 | 2012-09-26 | 浙江兆丰机电股份有限公司 | Novel automotive wheel speed sensor |
Non-Patent Citations (2)
| Title |
|---|
| 磁阻式轮速传感器在ABS中的应用;秦玉伟等;《仪表技术》;20091231(第9（2009年）期);第75页至第76页，图1-2 * |
| 秦玉伟等.磁阻式轮速传感器在ABS中的应用.《仪表技术》.2009,(第9（2009年）期),第75页至第76页，图1-2. |
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| CN102565448A (en) | 2012-07-11 |
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