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Automobile wheel speed sensor

A wheel speed sensor and magnetoresistive sensor technology, applied in the field of sensors, can solve the problem of high cost of automobile wheel speed sensors, achieve effective electromagnetic interference, improve stability, and stabilize signals

Active Publication Date: 2014-02-05
ZHEJIANG ZHAOFENG MECHANICAL & ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chip technology used is monopolized by foreign companies, and the chips are all imported from abroad, which makes the cost of automobile wheel speed sensors high

Method used

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  • Automobile wheel speed sensor

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Embodiment Construction

[0011] Such as figure 1 Shown, be the embodiment of the automobile wheel speed sensor of the present invention, comprise a plug, a high temperature wire 13, a magnet, a reluctance sensor chip 14 and an additional capacitance, described reluctance sensor chip, magnet and additional capacitance are connected in parallel And it is packaged inside the sealing assembly, the end of the magnetoresistive sensor chip is exposed to the sealing assembly, the two ends of the high-temperature wire are respectively connected to the pin 3 of the plug and the magnetoresistive sensor chip, and the middle part of the high-temperature wire is provided with a fixed structure to fix it with the car body. An annular groove is formed around the exposed end of the magnetoresistive sensor chip 14 on the outside of the sealing assembly and an O-ring 15 is mounted thereon. The cross section of the magnetoresistive sensor chip 14 is square, the magnetoresistive sensor chip is welded to the high temperatu...

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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 [0001] The invention relates to sensor technology, in particular to a wheel speed sensor suitable for an automobile anti-lock braking system. Background technique [0002] The automobile anti-lock braking system is related to the safety of automobile driving, especially the wheel speed sensor used, whose performance directly affects the automobile braking performance. Most of the wheel speed sensors used in the existing automobile anti-lock braking system adopt magnetoelectric wheel speed sensors. The disadvantage of this kind of wheel speed sensor is that the structure and manufacturing process are complicated, and the anti-electromagnetic interference ability is poor. When the vehicle speed is higher than a certain speed, the signal is output, and the frequency response is not sensitive when the speed is fast. In order to overcome the shortcomings of this type of sensor, Hall-type sensors are currently being used. This type of sensor has a constant output ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/44
Inventor 孔爱祥孟庆华雷良育
Owner ZHEJIANG ZHAOFENG MECHANICAL & ELECTRONICS CO LTD
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