TPMS Sensor & Valve Stem 4 Wheel Kit
For Use with TPMS Lite System
Stacks Batteryless and wireless TPMS (Tyre Pressure
and Temperature Monitoring System) completely re-defines tyre
pressure monitoring in motorsport. Based on patented
SAW sensor technology, the problems associated with
mounting batteries and complicated electronics in sensors on wheels
have at last been completely eliminated. Each wheel sensor
comprises of a 2mm thick x 12mm diameter SAW
pressure/temperature sensor and an antenna, in a 18mm diam. x 14mm
cylindrical housing weighing 10g the smallest and lightest sensor
on the market!
We use, under exclusive licence for Motorsport, Transense
Technologies patented Surface Acoustic Wave (SAW)
sensor technology which offers wireless, batteryless and compact
operation. SAW Sensors are passive (no power
required), wireless, low cost, rugged, and extremely small and
lightweight, making them well suited for measuring pressure,
temperature & torque (strain) in moving objects (e.g. tyres,
drive shafts etc.). These characteristics offer significant
advantages over technologies such as capacitive and piezoresistive
sensors, which require operating power and additional electronics
to make a wireless connection.
The SAW pressure & temperature sensor can be
easily integrated into a racing wheel with excellent results. These
systems enable the user to measure the pressure in each tyre up to
20 or more times per second. These higher sampling rates can be
used to improve chassis set-up, as well as provide an early
prediction of tyre failure.
Uniquely, the Stack system allows higher sampling rates to be
used without fear of shortening sensor life. The benefits of higher
sampling rates e.g. 10Hz are:
- The ability to see the dynamic effect of wheel and tyre loading
through individual corners, rather than just over a lap, and from
lap to lap.
- A much faster response and earlier warning of a tyre deflation
up to 0.9 seconds earlier!
Key Features
- No battery or complicated sensor electronics providing
unrivalled reliability
- No user maintenance required during full service life
significantly lower total life operating costs
- Detect slow punctures long before the driver feels them, and
long before catastrophic tyre failure
- One module interrogates 1, 2 or 4 wheels suitable for cars,
trucks and bikes
- Models available with 1Hz, 5Hz, or 10Hz sampling
- Specialist high sampling rate modes up to 40Hz on one
wheel
- Supports virtually unlimited number of wheel sets
- Secure operation each sensor has a unique serial number to
ensure other teams cannot interrogate it remotely
- Small, light sensor 18 mm x 14mm; only 10g
- Compact, lightweight module 100mm x 72mm x 24mm; 140g
- Pressure and Temperature data output on user configurable
CAN bus.
- 52mm gauge provides comprehensive pressure and temperature
information and alarm warnings
- Calibration information is held in each sensor no need to
upload calibration tables into each interrogator module.
Benefits of Stack TPMS:
- Safety
Advance warning of tyre issues (including slow puncture detection)
prevents costly accidents and injury.
- Performance
Tyres provide the biggest and easiest performance gain. The right
pressure and temperature on the warm up lap can give you a
performance advantage to make up many places during the first
lap.
- Strategy
Data analysis can control tyre wear, allowing a change in driving
style to maximise tyre life.
Benefits of battery-less:
- Smallest size available only 18mm diameter x 14mm
- Lightest TPMS sensor available only 10g, which
means it can be used as a partial counterweight to the valve. The
battery based sensors are typically 35-70g each, plus the need for
a counterweight. The Stack solution can remove 70-140g or more from
each wheel, or a total of 280-560g of unsprung weight!
- Higher operating temperatures our sensors are calibrated up to
150C continuously, and can run higher without permanent
damage.
- Higher sampling rates, without the need to replace batteries
continuous sampling from 1Hz to 40Hz, with no adverse affect on
sensor life.
- Longer sensor life, and hence significantly reduced operating
costs. The sensors have a typical life of 5+ years, compared to the
battery based sensors which typically require annual
replacement.
- Totally eliminates the requirement to replace batteries
in-season (if the sensor has replaceable battery), reducing
operating costs, and increasing long-term system reliability.
- The benefits of a battery-less solution are amplified in a
wind-tunnel application. The longer running times associated with
wind tunnel testing means that a sensor battery can be exhausted in
as little as 1 week, running at 1Hz, or less than one day running
at 10Hz! The Stack battery-less sensor can run at 10Hz
indefinitely.
- No recycling issues in disposing of batteries.
Installation
Each wheel sensor is mounted internally on the wheel rim or valve.
The Interrogator Module is mounted in a convenient location on the
vehicle, and 4 antennas are each mounted locally to each wheel
(within approx 0.5m of the wheel), and connected to the
Interrogator Module by RF cable. The supplied
configuration software features a comprehensive set of tools to
assist in antenna setup.
The CAN data output can be connected to the 52mm
colour LED display gauge or any standard data
acquisition or driver display system supporting
CAN.
Operation
The interrogator module takes readings of tyre pressure and sensor
(air) temperature from each wheel sensor continuously at a
pre-defined rate between 1Hz and 10Hz. pressure and temperature
data for each wheel is output on CAN bus, with user
configurable CAN-ID messages.
Configuration
The unit can be configured over a standard RS232 link
from the PC using the supplied PC
configuration software. The easy to use software can be used to set
CAN IDs, monitor values in real time, authorised
sensors, set calibrations and import sensors to the systems library
(database). There is also an atmospheric pressure offset to fine
tune the system to the days environmental conditions.
Stack TPMS: Pro or Lite
Stack TPMS is available in two variants: Pro and Lite.
The Pro system offers greater resolution and accuracy over the Lite
system. The RFID wheel management facility, including
automatic detection of wheel changes, is also only available on the
Pro system important if wheels are regularly changed. An expanded
CAN-bus capability is also a feature of the Pro
system.
Applications
- Motorsport cars, trucks and bikes
- Commercial vans & trucks
- Military
- Off-the-road (OTR) construction, mining,
landmoving and freight
- Agricultural machinery
- Personnel carriers
- HDVs
- Public transportation buses and coaches.
- 44 and 66