Wheel velocity and acceleration detecting system and detecting method thereof

A technology of wheel speed and acceleration, applied in the direction of speed/acceleration/shock measurement, acceleration measurement using inertial force, linear/angular velocity measurement, etc., can solve difficult, expensive, complex system and other problems, and achieve the effect of control optimization

Inactive Publication Date: 2008-02-27
SAE MAGNETICS (HK) LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0006] However, this technique has some drawbacks
For example, it is difficult, expensive, and complex to create a system that produces alternating south and north magnetic poles around an encoded wheel
Moreover, in order to control the running quality of the car, it is necessary to detect the rotational speed and acceleration of the car, while the existing technology can only detect the speed of the car

Method used

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  • Wheel velocity and acceleration detecting system and detecting method thereof
  • Wheel velocity and acceleration detecting system and detecting method thereof
  • Wheel velocity and acceleration detecting system and detecting method thereof

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Embodiment Construction

[0030] The following exemplary embodiments will provide a sensing device including a printed circuit board assembly (PCBA), a Wheatstone bridge circuit, a geomagnetic field detector and a processor. In the four resistors of the Wheatstone bridge circuit, each resistor is made of a giant magnetoresistance (GMR) element, and each GMR element is a layered structure including at least one ferromagnetic layer ( Such as a pinned layer (pin layer)) and a non-magnetic layer (such as a free layer (free layer)). When the external magnetic field changes, the free layer or the non-magnetic layer will rotate along the ferromagnetic layer or the fixed layer, thereby causing the resistance of the ferromagnetic layer or the fixed layer to change.

[0031] Wheatstone bridges generally measure unknown resistances by balancing the two arms of the bridge. The Wheatstone bridge in the embodiment of the present invention is used to double the output power of the differential signal of the GMR elem...

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PUM

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Abstract

The invention discloses a system to detect the wheel speed and / or acceleration. The system includes a sensor connected to the wheel and processor. The sensor includes a circuit (such as Wheatstone bridge circuit) with many resistances (4). The every resistance includes a huge reluctance element and resistance value which at least part can change along to the change of external magnetic field intensity. At least part of the sensor can generate the signal according to the resistance value. The processor can compute the wheel speed and / or acceleration according to the signal. The invention also discloses the method to detect the wheel speed and / or acceleration by the system. The invention can detect the speed / acceleration of wheel speed and control the motor running state and optimize the speed.

Description

technical field [0001] The present invention relates to a magnetic sensor device, in particular to a system and method for detecting wheel speed and / or acceleration using a magnetic sensor unit. Background technique [0002] A variety of techniques are used in speed sensing devices to detect the rotational speed of a component. For example, in various vehicle models, the speed sensing device cooperates with the anti-lock braking systems (ABS) of the vehicle to detect the wheel speed. US Patent Application No. 10 / 847,838 discloses a dedicated speed sensing device, the entire content of which is hereby incorporated by reference in the present invention. [0003] Conventional cars are fitted with magnetically encoded wheels, which have magnetized ferrite on the outer surface. Specifically, the magnetized ferrite is housed in a laminate with alternating south and north poles, and the laminate runs around the circumference of the encoder wheel. The coding wheel is provided wit...

Claims

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Application Information

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IPC IPC(8): G01P3/488G01P15/12
Inventor 姚明高
Owner SAE MAGNETICS (HK) LTD
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