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WHEEL MOTION SENSOR
What is a wheel mounted motion sensor -PI-WMS? Well.. it is a MEMS inertial system mounted right on a vehicle's wheel. Why? Not only because we can, but because by doing so we get odometer and accurate heading without need to access the vehicle CAN bus.
INTERFACES AND
VEHICLE REQUIREMENTS
Output Data Packet Rate
Interface

Wheel rotation rate


Wheel heading angle rate

PI-WINS measurements
Heading angle error

Wheel rotation rate error
DIMENSIONS AND ENVIRONMENT
Weight
Dimensions
Enclosure
Max. operation time
on a built-in battery
Charging time
Wheel unit connector
Operating temperature range
10 Hz
USB (we supply
the BT dongle)
up to 10 full
revolutions per sec
(600 rpm)
< 1000 deg/sec
1 deg per 1 hour
of driving time
less than 0.001
of wheel
perimeter in sec
< 300 g
Ø97x38 mm
IP-67

12 hours
< 2 hours
mini-USB
-20C…+50C
DATA SHEET
MANUAL
STEP MODEL
downloads
Wheel Mounted Motion Sensor (PI-WMS) is a wireless unit that is mounted right on a vehicle wheel. It has a battery and BT module, so it runs on a single charge for 12 hours and sends wheel measurements via Bluetooth to an onboard computer - a telematics unit or a tablet computer.
PI-WINS OUTPUT: Accurate Trajectory
PI-WMS accurately measures instantaneous wheel angular velocity, wheel vibration and wheel heading. Rotation of the wheel is used to calibrate most of the errors encountered in traditional MEMS-based dead reckoning systems.

One PI-WMS on one wheel. Reference DGPS/INS in cabin. Total driving time is 15 minutes. Initial heading and position from DGPS, otherwise inertial on-the-wheel 2D navigation solution.
Low power mode - near real time solution directly from PI-WMS. EKF mode - with lag, provided via connected onboard computer. Final errors are less than 10 meters!

No need for navigation or positioning?
PI-WMS can measure high frequency vibrations, related to e.g. road surface quality, directly from the vehicle wheel: results are unaffected by vehicle suspension
WHAT IS NEW?
Rotation of the wheel as a free source of calibration for the PI-WMS gyros and accelerometers. This is called "carouseling" and we have gone to the next level with the method. Learn more here.
WHY IN THE WHEEL?
It is well known that measurements have to be done in the place where the action occurs. There are many applications for our technology: warehouse logistics and tracking, navigation in mines, road quality analysis, expensive tire wear monitoring and many more.
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