PAT


suppliers


aaaa logo

Member of Australian Automotive Aftermarket Association

PRTC Council Member

4WD Council Member



Latest News

Wheel Speed Sensors – More than just ABS

When Wheel Speed Sensors first appeared on vehicles they were predominantly for Anti-Lock Braking Systems (ABS). In today’s modern vehicles they are used by many different systems.

With manufacturers focusing on, and the customer demanding improved safety, Speed Sensors have become a vital component in the operation of many of the vehicles intelligent safety systems and other vital vehicle operations.

Intelligent data transmission systems like Controller Area Network (CAN) has allowed several control units to use the data. When it comes to driving safety, speed sensors play a vital role and this is reflected in the number of vehicle systems that rely on them.

They are used by the control units in driving assistance systems including ABS, TCS (Traction Control System), ESC (Electronic Stability Control) ADAS (Advanced Driver Assist System) and ACC (Adaptive Cruise Control) and others to detect wheel speed.

This Wheel Speed Sensor information may also be used by the engine management system, transmission control module and navigation system.

Wheel Speed Sensors now have an impact on the vehicle dynamics, driving comfort, safety, emissions and fuel consumption.

What the Technician Needs to Know
Wheel Speed Sensors come in 2 types, passive or active. Passive sensors are inductive analogue type and active sensor are digital hall sensor type. Active sensors need a power supply to work. Passive sensors do not.

Passive/Inductive wheel speed sensors
A typical inductive Wheel Speed Sensor comprises of a coil of wire wound around a soft iron core connected to a permanent magnet. This sensor is positioned close to the trigger wheel (impulse wheel, tone wheel) which is attached to the wheel hub or drive shaft. The rotation of the trigger wheel and the resulting movement from tooth to tooth varies the sensor magnetic field inducing an alternating voltage into the sensor coil. The frequency and amplitude of the induced voltage is proportional to wheel speed. At slow speeds the signal can become inaccurate on this type of sensor. The position of the sensor in relation to the trigger wheel is vital and damage can be done when work is done in the area.

This type of wheel speed sensor does not require an external power supply to produce an output signal and generally has a 2 terminal connector.

 

Active Wheel Speed Sensors
Unlike passive Wheel Speed Sensors, active wheel speed sensors have integrated electronics and is supplied with a defined voltage from the ABS module. There are two types of active sensors, the magneto-resistive type and those using a hall sensor. Both sensors look similar to the passive sensor and may come with 2 or 3 terminals. Active wheel speed sensors produce a digital signal.

This digital wheel speed sensor may be triggered either by a series of opposing magnets around a multipole ring (encoder) or using a toothed ring similar to the passive type. The encoder can be inside the wheel bearing, on the wheel bearing or on the wheel carrier.

The advantage of the active wheel speed sensor is that can accurately monitor all wheel speeds (including stationary) and dual element sensors can also monitor reverse rotation

Advantages of Active Sensors

  • Wheel speed detection from stationary. This allows speed measurements down to 0.1 km/h, which is important to traction control and hill decent control.
  • The sensor is smaller and lighter.
  •  Insensitivity to vibration and temperature fluctuations.
  • Less sensitive to changes in air gap.
  • Less electromagnetic interference.
  • Detect forward and reverse movement.

Electric (BEV) and Hybrid Vehicles (HEV, PHEV)
Electric and hybrid vehicles use regenerative braking to slow the vehicle but still have a conventional braking system. They still need and have wheel speed sensors for the ABS, traction control and many other systems. The wheel speed sensors used on electric vehicles are the same as used on an internal combustion engine vehicle and will require maintenance and repair. Premier Auto Trade’s range of wheel speed sensors is continuously growing and covers BEV’s and HEV’s. This includes the Tesla range.

Future Evolution of Transport
Wheel speed sensors have evolved significantly since their introduction. The popularity of EV’s is expected to grow in the future, the evolution of all systems will continue. PAT are constantly working with OE suppliers and manufacturers to ensure we stay up to date with the latest technologies including electric vehicles. This constant research and development allows PAT to have the parts and technical knowledge available to our clients as transportation evolves.



Latest News

Dual Petrol Injection Systems – Technical Tip

Wheel Speed Sensors – More than just ABS

PAT Expands Emission Sensor Range

PAT Racing & Performance Injector Range Upgrade

Coils ain’t Coils!

ICON SERIES Range Grows

Oil Level and Oil Temperature Sensors Operation

Failed Air Temperature Sensors Symptoms

MAP Sensors Testing

TI Automotive Mustang Performance Pump

New ICON SERIES Hose Clamp Range

New Premium Sensors Ranges

Relay problems on vehicle

Test Equipment and Tools

Fuel Rail Sensors (FRS)

Failing Secondary Ignition

Testing Electric Fuel Pumps

Performance Fuel Rails and Filters

Testing CAM Angle Sensors (CAM)

Testing Electric Valve Solenoids (EVS)

Electronic Throttle Bodies

Performance Fuel Cells & Surge Tanks

Fault Finding Fuel Pressure Regulators (FPR)

Testing Variable Camshaft Actuators (VCA)

Testing Accelerator Pedal Position Sensors (APS)

Diagnosing Crank Angle Sensors (CAS)

Performance Regulators and Gauges

Differentiating Wheel Speed Sensors (WSS)

Mass Air Flow Sensors - Hot Film

Mechanical Fuel Pumps (MFP)

ICON Series Hoses

Particulate Matter Sensors (PMS)

Performance Fuel Injectors

Fuel Injectors (GDI)

DENSO Spark Plugs

Performance Fuel Pumps

Cooling Fan Switches (CFS)

Water Temperature Sensors (WTS)

Reverse Light Switches

Oil Temperature Sensors (OTS)

BMC Air Filters

Flasher Cans

Exhaust Pressure Sensors (EPS)

Power Steering Switches

Coolant Temperature Sensors (CTS)

Variable Intake Manifolds (VIM) and Intake Control Valves (ICV)

Oil Level Sensors (OLS)

Throttle Position Sensors (TPS)

Air Temperature Sensors (ATS)

Ignition – Condensers, Contact Sets, Distributor Caps and Rotors

Fuel System Accessories (FSA)

MAP Sensors (MAP)

Relays (REL)

HALL Sensors and Pickups (HAL)

Fuel Rail Sensors (FRS)

Speed Sensors (SPS)

New ICON Series Fuel Pump Range

New ICON Series Hose Range

Performance Range Increase Continues

PAT Oxygen Sensor Range Expands

PAT Expands Automotive Aftermarket Presence

Equipment and Tools

Electric Fuel Pumps (EFP)

Electric Valve Solenoids (EVS)

CAM Angle Sensors (CAM)

Ignition Modules (MOD)

Injector Service Components

Exhaust Gas Temperature Sensors (EGT)

Throttle Bodies

Knock Sensors

Ignition Coils

Fuel Injectors (Petrol)

Variable Camshaft Actuators (VCA) Oil control Valves

Accelerator Pedal Position Sensors (APPS)

Exhaust Gas Recirculation Valves (EGR)

Relocation of Sydney Distribution Centre

Wheel Speed Sensors (WSS)

High Tension - Ignition Lead Sets (ILS)

Suction Control Valves (SCV)

Mass Air Flow (MAF) Sensors

Crank Angle Sensors (CAS)

Fuel Pressure Regulators (FPR)

Oil Pressure Sensors

Exhaust Gas Oxygen Sensors

Shedding Light on Stop Light Switches

Ignition Distributors

Common Rail Diesel (CRD) Fuel Injectors

Idle Speed Control

New Distribution Centre Opening in ADELAIDE

New Distribution Centres Opening in PERTH and DARWIN

New Fuel Catalogue from Premier Auto Trade

BMC 4WD Air Filters Range Expands

New MVP Fuel Injector Range

PAT Developing Programs on Demand

New Premium Packaging for PAT

New Product Ranges Released By PAT

PlusQuip Test Equipment Range Expands

New Raceworks Catalogue

New Exhaust Gas Temperature Sensors

New Trade Catalogues from Premier Auto Trade

New Distribution Centre Opening in Adelaide

More European Parts from Premier Auto Trade

New PlusQuip Fuse Current Tester

PAT Pumped up!

Coils ain't Coils!

New PlusQuip Electronic EGR, Throttle Body, and Actuator Tester

New breed of High Performance products!

New Ignition Coil and Lead Set Kits

Wheel Speed Sensor Program Launched

Premier Ignition Lead Program Launch

Ignition Coils - Coils ain't Coils!

PlusQuip Battery Testers Launch

Premier Auto Trade Supporting Local Racing

Oval Trumpet Airbox (OTA) for 4WD applications from BMC Air Filters

BMC Air Filters NOW AVAILABLE from Premier Auto Trade

Premier Ignition Coils

MAP-013 and KNS-021 Now Back in Stock

BMC Air Filter partners with Premier Auto Trade

Premier Auto Trade opens South Australian Distribution Centre

Direct Fit Oxygen Sensor Range Hits 700

Automotive Electro-Mechanical Relays Types / Faults / Diagnosis

PlusQuip Tools and Equipment Launch

PlusQuip Fuel Line Repair Kit

PlusQuip Fuel Injector Service Kit

E85 High Performance with Premier Auto Trade

Testing EGR Systems (Pt 2)

New Delphi Fuel Module and Ignition Coil Range

Fuel Injector Service Components from Premier Auto Trade

Older News...

   privacy statement   terms of use   terms and conditions   sitemap   news  

© PremierAutoTrade