What is a wheel mounted motion sensor -PI-WMS-LP? 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.
Output Data Packet Rate
Wheel rotation rate
Wheel heading angle rate
Heading angle error
Wheel rotation rate error
DIMENSIONS AND ENVIRONMENT
Max. operation time
on a built-in battery
Wheel unit connector
Operating temperature range
USB (we supply
the BT dongle)
up to 10 full
revolutions per sec
< 1000 deg/sec
1 deg per 1 hour
of driving time
less than 0.001
perimeter in sec
Wheel Mounted Motion Sensor (PI-WMS-LP) 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-LP OUTPUT: Accurate Trajectory
PI-WMS-LP 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-LP 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-LP. EKF mode - with lag, provided via connected onboard computer. Final errors are less than 10 meters!
No need for navigation or positioning?
PI-WMS-LP can measure high frequency vibrations, related to e.g. road surface quality, directly from the vehicle wheel: results are unaffected by vehicle suspension
Rotation of the wheel as a free source of calibration for the PI-WMS-LP gyros and accelerometers. This is called "carouseling" and we have gone to the next level with the method. Learn more here
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.