Good Wholesale Vendors Turbo Pressure Sensor - ABS Sensor HH-TS1002 – HEHUA

HEHUA NO: HH-TS1002

OEM NO:
4410328090
1504929
4029104200
4460000009
AXU0028
AMPA938
5010422332

APPLICATION:SCANIA  P,G,R,T – SERIES G 230  (2004/03 – /)

Workings of a Hall effect ABS sensor
An anti lock braking system (ABS) sensor is used for determining wheel rotation speed to prevent wheel lock up when braking. The Hall effect ABS sensor consists of a permanent magnet with a Hall effect sensor next to it. The magnetic field strength changes when a magnetism sensitive object passes through the magnetic field of the magnet. This changing of the magnetic field causes the output of the Hall effect sensor to change.

In most cases the object used to influence the magnetic field is a disk or ring with evenly distributed teeth, mounted on the driveshaft or in the bearing. When the wheel is rotating, the teeth are passing the sensor and the pattern in which they are placed is visible in the ABS sensor signal. Each period of the signal is a tooth passing the sensor. The frequency of the signal depends on the rotation speed of the wheel and the amount of teeth on the disk or ring.

Two different types of Hall effect ABS sensor are used in cars, with either 2 wires or 3 wires.

The 3 wire Hall effect ABS sensor has a simple power supply and a signal wire with the signal voltage (Us) going to the ABS ECU, Depending on the sensor design, the presence of a tooth causes either a high or a low signal voltage and a gap between teeth the opposite. The resulting signal is a square wave.

The 2 wire Hall effect ABS sensor has a 12 V power supply wire but no direct ground. As shown in figure 2 the ground of the sensor is also the signal wire. The 2 wire Hall effect ABS sensor is current regulating. The amount of current (Is) is changed by the sensor when a tooth is passing the sensor. Depending on the sensor design, the presence of a tooth causes either a high or a low current and a gap between teeth the opposite. This current flowing through the resistor inside the ABS ECU will produce a voltage (Us) related to the ground, similar to the square wave signal of the 3 wire Hall effect ABS sensor. The voltage levels are different and much lower than a 3 wire Hall effect ABS sensor because of the low currents. Voltage levels can also change from system to system depending on current flow and resistor values but a clear square wave pattern should be visible.