Editorial Technical Reference

Wheel Speed Sensor

This page explains how Wheel Speed Sensor is classified within Motor Vehicle Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A Wheel Speed Sensor measures the rotational speed of a vehicle's wheel and sends this data to the ABS/ESC control unit for traction and stability control.

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Product Specifications

Technical details and manufacturing context for Wheel Speed Sensor

Definition

The Wheel Speed Sensor is a critical component in automotive anti-lock braking systems (ABS) and electronic stability control (ESC). It is mounted at each wheel hub or on the differential to detect wheel rotation speed. The sensor is specified by its output signal type (Hall effect or variable reluctance), operating voltage, air gap, and connector type. Higher-grade sensors offer better temperature stability, higher accuracy, and greater resistance to vibration and electromagnetic interference, making them suitable for advanced driver assistance systems (ADAS).

Working Principle

The sensor operates by detecting changes in a magnetic field caused by a toothed tone ring rotating with the wheel. In a variable reluctance sensor, a permanent magnet and coil generate an AC voltage whose frequency is proportional to wheel speed. In a Hall effect sensor, a semiconductor element switches on/off in response to the passing teeth, producing a digital square wave signal. The ECU interprets this signal to determine wheel speed and detect lockup or slippage.

Common Materials

Copper wire (for coil), Ferrite magnet, Hall IC (e.g., silicon), Epoxy resin (for potting), PBT or PA66 plastic housing, Steel or aluminum mounting bracket

Technical Parameters

Parameter	Typical range	Notes & selection driver
Output Signal Type	Hall effect or Variable reluctance	Hall effect provides digital output; VR provides analog AC signal.
Operating Voltage	4.5–24 V	Typical supply voltage range for Hall sensors.
Output Current (max)	20 mA	Maximum output current for Hall sensor.
Air Gap	0.3–1.5 mm	Distance between sensor tip and tone ring; critical for signal strength.
Frequency Range	0–2500 Hz	Corresponds to wheel speed up to ~250 km/h depending on tone ring teeth.
Operating Temperature Range	-40 to +150 °C	Standard automotive temperature range.ISO 16750-2
Ingress Protection Rating	IP67–IP69K	Resistance to water and dust.IEC 60529
Connector Type	2-pin or 3-pin	Depends on sensor type; 2-pin for VR, 3-pin for Hall.
Cable Length	0.5–2.0 m	Customizable per vehicle harness.
Mounting Type	Flange or bolt-on	Flange with M6 or M8 bolt.
Output Signal Duty Cycle	50 ± 10 %	For Hall sensors, square wave duty cycle.
Rise/Fall Time	≤ 1.5 µs	For Hall sensors, output switching speed.
Vibration Resistance	20 g	Maximum acceleration for vibration testing.ISO 16750-3
ESD Tolerance	±2 kV	Electrostatic discharge withstand voltage.ISO 10605
Coil Resistance (for VR)	600–1200 Ω	Typical resistance range for variable reluctance sensors.
Inductance (for VR)	100–500 mH	Typical inductance range for VR sensors.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Wheel Speed Sensor.

Published Manufacturer Relationships

Source-reviewed profile relationships currently associated with Wheel Speed Sensor

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