Product
AD7852
Wheel Position Sensor
Dynamic vehicle measurement series
For the collection of wheel position data
Under various weather conditions
Features
- 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
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.
Logic
Individual encoders measure the angle independently.
This data is calculated simultaneously as absolute values by the AD7893-WPS.
Appearance
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
Specifications
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 | |
| Resolution | ||
| 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
