Wheel Position Sensor

Dynamic vehicle measurement series
For the collection of wheel position data
Under various weather conditions


  • High resolution 17 bit rotary encoder
  • Absolute value measurement system - no need for calibration
  • Attachable to a standard wheel
  • IP65 waterproof rating
  • Measured data stored on Micro SD card
  • Can connect to CAN logger
  • Single rod supporting type for high speed measurement NEW


Liner link type


Single rod type


Single rod type


Click the picture above to enlarge in a new window.

Principles of operation

WPS - Wheel position sensors consists of rotary encoders. Angle data is aggregated to describe the vehicle position.

Tire position is measured against a reference point on the vehicle body and calculated with an original A&D model.
Individual encoders output the angle data which is converted into the following 6 values:
X displacement (Px : mm) : Vehicle running direction
Y displacement (Py : mm) : Shaft direction
Z displacement (Pz : mm) : Gravity direction
Ax (deg) : Angle of gravity direction and wheel diameter direction
Ay (deg) : Wheel rotation angle
Az (deg) : Angle of vehicle running direction and tire direction.


Individual encoders measure the angle independently.
This data is calculated simultaneously as absolute values by the AD7893-WPS.



Data example

Data example

Vehicle used : Mini Cooper S
Test pattern: Sweep steering
Sampled wheel : Front left
Measured values : Positions and angles
Pitch angle and Tire radius
Measurement duration : 15 secs
Vehicle velocity : Up to 40km/h


Sensor specifications

Measurement range x ±30
Angle (deg)*1 y Unlimited
  z ±180 (Single rod type ±150)
Resolution x 0.024
Displacement (mm) y 0.024
  z 0.01
Resolution x 0.0027
Angle (deg) y *2
  z 0.0027
Encoder   17bit/rotaion
Tire rotary encoder (deg) range 0 to 360
  resolution 0.09
Maximum tire rotation (rpm)   3000
Fixture Suction, magnet and safety belt Upsprung weight 2.38
Weight (kg) Upsprung weight 1.22
  • *1: Dependent on the cable and fixture
  • *2: See tire rotary encoder range

AD7893 - WPS

Calculation rate   1kHz
Measured factors   Displacement x, y, z
    Angle around x, y, z axes
    Wheel speed
    Angle speed
Low pass filter   4 dimension butterworth
    Selectable from 1, 2, 5, 10, 20, 50, 100, 200, 500 (Hz)
Data output Format CAN CAN
    Frequency : Selectable from 1, 2, 5, 10, 20, 50, 100, 200, 500, 1k (Hz)
Size Width 97mm x Height 97mm x Depth 208mm
  Width 110mm x Height 115mm x Depth 310mm    Including handling frame
Power supply AC 100 to 240V DC 12V AC power adaptor
  AC 100 to 240V  
Operating temperature   5 to 40℃
Operating humidity*1   5 to 90%RH
weight (kg)   1.2
  • *1: No condensation

User-Friendly GUI

Page Top