By ABS Sensor 1396
Basic Principles and Functions
Comparison of ABS Sensor Types
Innovations in Testing and Maintenance
Storage and Transportation Standards
Technology Trends and Applications
ABS (Anti-lock Braking System) uses a high-frequency braking control—up to 20 times per second. It keeps the wheel slip rate between 10% and 30%, which is the best range. As the "nerve endings" of braking safety, ABS sensors collect more than 90% of braking signals. When wheel speed difference goes over 15%, the system starts pressure control within 0.1 seconds. Compared to traditional braking systems, braking distance on slippery roads can be 30% shorter.
During motion monitoring, the sensor must capture wheel speed signals from 0.01 to 3000 Hz. Its accuracy reaches ±0.2 r/min (revolutions per minute). For example, a digital sensor from one brand uses a dual-channel redundancy design. This improves fault warning accuracy to 99.3%. Signal delay is less than 2 ms, which is five times faster than traditional products.
| Type | Accuracy Range | Response Time | Operating Temperature | Suitable Vehicles |
| Magneto-electric | ±3% | 15 ms | -30~120°C | Economy fuel vehicles |
| Hall Effect | ±0.5% | 2 ms | -40~150°C | Mainstream passenger cars |
| Magnetoresistive | ±0.1% | 1 ms | -55~175°C | New energy vehicles |
Product Advantage Comparison 1: A certain brand's Hall sensor keeps signal stability at 98.5% in -40°C. This is 42% better than traditional magneto-electric types.
When a toothed ring with 48±2 teeth rotates, the sensor creates a sine wave signal through changes in the magnetic field. The speed formula is:
n = (f × 60) / Z
Here, f is pulse frequency, and Z is number of teeth. A new type of sensor has a sampling rate up to 20 kHz and can detect angle changes as small as 0.05°.
After three-stage filtering and amplification, the signal-to-noise ratio reaches 80 dB. The analog-to-digital conversion uses 12-bit precision. It turns the wheel speed signal into 4096 digital levels. The ECU (Electronic Control Unit) processing cycle is only 5 μs (microseconds).
A company has developed a wireless tester that supports Bluetooth 5.0. It shows the speed curve of all four wheels in real time. Compared to traditional oscilloscopes, testing is 60% faster and the false detection rate drops to 0.3%.
Product Advantage Comparison 2: A cloud-based diagnosis platform reads fault codes in seconds. It is three times faster than old OBD (On-Board Diagnostics) tools.
Sensors use multi-layer anti-static packaging. During storage, they must meet the following:
Product Advantage Comparison 3: A special sealing solution passed IP69K certification. It works for 10 years in 85°C and 95% RH conditions.
The new generation of sensors includes three key innovations:
In mining vehicles, one type of sensor with three protections achieves the following:
It reduces the failure rate from 3‰ (per thousand) to 0.5‰.
Begin by disconnecting the sensor from the vehicle. Next, measure the resistance by placing the multimeter probes on both contact points. Finally, compare the obtained reading with the manufacturer's specified range.
The ABC brake sensors are typically positioned close to the wheels, where they interface with the wheel hub or axle assembly to monitor rotational speed.
For sensor maintenance, begin by employing compressed air to eliminate dust particles near the sensor surface. Subsequently, gently polish the area with a soft microfiber cloth to remove residual contaminants. For persistent deposits, you may apply either a mild cleaning solution specifically formulated for delicate surfaces or create a diluted mixture of warm water and gentle dish soap for effective cleansing.
The system continuously tracks the rotational speed of individual wheels. This information gets relayed through electrical wiring to the ABS electronic control unit (ECU). During hard braking events, the anti-lock braking mechanism prevents wheel lock-up, enabling operators to retain directional command.
These sensors are typically situated within the front wheel hub assembly or positioned adjacent to the brake rotor.