Cars with anti-lock brake system (ABS), drive anti-skid brick control (ASR), four-wheel drive or electronic stability program (ESP), in addition to wheel sensors are equipped with Hall acceleration sensors to measure cars Longitudinal and lateral acceleration while driving.
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The Hall element is a Hall-based magnetic sensor that has evolved into a diverse family of magnetic sensor products and has been widely used. They can be used to detect magnetic fields and their changes, and can be used in a variety of applications related to magnetic fields. Hall devices are based on the Hall effect. Hall devices have many advantages. They are solid in structure, small in size, light in weight, long in life, easy to install, low in power consumption, high in frequency, resistant to vibration, and not afraid of pollution or corrosion such as dust, oil, water vapor and salt spray.
　 Movement between the Hall device and the working magnet
The Hall linear device has high precision and good linearity; the Hall switch device has no contact, no wear, clear output waveform, no jitter, no rebound, and high position repeatability. Hall devices with various compensation and protection measures have a wide operating temperature range. According to the function of the Hall device, they can be divided into: Hall linear device and Hall switching device. The former outputs an analog quantity, and the latter outputs a digital quantity.
　 Place a magnet on the back of the Hall device
According to the nature of the objects being detected, their applications can be divided into direct applications and indirect applications. The former directly detects the magnetic field or magnetic characteristics of the object to be inspected, and the latter detects the artificially set magnetic field on the object to be used, and uses this magnetic field as a carrier for the detected information, through which many non-electrical and non-magnetic materials are used. Physical quantities such as force, moment, pressure, stress, position, displacement, velocity, acceleration, angle, angular velocity, number of revolutions, rotational speed, and time at which the operating state changes are converted into electrical quantities for detection and control.
structure
Structural principle and static characteristic curve
The "elastic" fixed spring - mass system - is used in the Hall accelerometer. The Hall accelerometer has a vertical strip spring with one end clamped and a permanent magnet attached to the other end for vibration quality. Above the permanent magnet is a Hall sensor with a signal processing integrated circuit and a copper damper plate underneath.
working principle
　　 Circuit work
If the sensor senses lateral acceleration, the sensor's spring mass system is cheaper to leave its rest position. The degree of cheapness is related to the magnitude of the acceleration. The moving magnet generates a Hall voltage in the Hal element and outputs a signal voltage after being processed by the signal processing circuit, which linearly increases as the acceleration increases. The acceleration range is about ±1g, the sensor frequency is very low, only a few hertz, and is damped by point power.
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