 Stack’s 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 21mm diam. x 16mm cylindrical housing weighing 15g - the smallest and lightest sensor on the market!
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 maximize tyre life.
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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.
Benefits of "batteryless":
- Smallest size available - only 18mm diameter x 14mm
- Lightest TPMS sensor available - only 15g, 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 150°C 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 batteryless 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 batteryless sensor can run at 10Hz indefinitely.
- No recycling issues in disposing of batteries
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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 TPMS 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!
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.
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, authorized sensors, set calibrations and import sensors to the system's library (database). There is also an atmospheric pressure offset to fine tune the system to the day's environmental conditions.
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.
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.
Run-Flat Inserts
Stack's batteryless TPMS fully supports Run-flat Tyre Support Inserts (TSI). " Run-Flats" allow the vehicle to be driven with one or more flat tires - eliminating the immediate need to change tyre, important in military, first responder and high value freight vehicles .
Run-flats must only be installed on a car which has TPMS. TPMS alerts the driver to a puncture so they are aware that they have a limited time running on Run-flats until they have to replace their tyre. Stack TPMS maximizes that limited time by detecting problems with the tyre as early as possible.
Data Acquisition
 The CAN data output can be fed into any compatible system. The data shown here was recorded with Stack's MFR system and displayed in Stack's easy-to-use DataPro 5.
The software allows data sets to be viewed in combination with other parameters to determine optimum tyre pressures and temperatures (click thumbnail to view full screen).
View Customer's sample data
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 only available on the Pro system - important if wheels are regularly changed (TPMS Lite is able to "hot swap" three sets of wheels whereas TPMS Pro can handle up to 100 wheelsets).
An expanded CAN-bus capability is also a feature of the Pro system.
Full specifications - click here
System Schematic
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