The importance of eliminating sensor module batteries may be understood as follows:The VisiTyreTM Batteryless Advantage
_____________________________________________VisiTyre's outstanding competitive advantage over all other tyre pressure monitoring systems presently being offered in the marketplace is its patented technology which eliminates all wheel module sensor batteries.
This image shows a "Button-Cell" battery in situ in a typical RF wheel electronics module. Note that the battery is non-serviceable due to the PCB contacts being welded to the battery terminals; VisiTyre eliminates the battery altogether.
Unlike all other TPMS sensors, VisiTyre's batteryless technology has:
NO sensor battery to fail and thus zero Maintenance;
NO environmental disposal phase for a battery;
NO need to be put into (and thus to bring out of) hybernation;
NO need for a TPMS Activation Tool/Magnet;
NO requirement for a TPMS "Relearn Process" after wheel rotation;
NO need for a Scan Tool (to upload tyre position data via OBD port);
Full integration with wheel rim and independent of tyre valve stem.
US DOT NHTSA evaluations reveal that for battery powered TPMS sensors, each sensor battery will fail at least once during the vehicle's lifecycle and as the battery is non serviceable, it will cost up to US$100 per sensor to replace and refit complete wheel sensor modules . . .
Batteries are chemical systems which have limited lifetimes and performance, both of which are degraded by extreme cold and heat of North American and European climatic conditions. If battery failure occurs during warranty periods the OEM has a potential ‘cost liability time bomb’ in every new car which is fitted with battery powered sensors.
This cost must also take into account the potential liability of battery failures that lead to serious vehicle accident related injuries and or fatalities . . .
VisiTyre's sensor achieves a cost reduction and improved reliability by eliminating the battery from the sensor module. Sensor power is achieved using a close proximity electromagnetic coupling which eliminates the need for all sensor batteries. The VisiTyre Pick-up coil is shown in the following photograph:
VisiTyre Pick-up coil, shown withdrawn from its mounting cover and
equipped with high temperature silicon cable and waterproof connector.
Continuous data transmission is achieved using a modulation (backscatter) technique with the applied electromagnetic flux.
Visualization of the Magnetic Field of VisiTyre Caliper Pick up Coil
Photo: Paul Nylander University of California Irvine.
Conclusion: Battery TPMS require complex workshop support procedures involving setup/test tools [1]. Furthermore, all batteries will eventually fail resulting in safety and litigation issues as well as an environmentally sensitive battery disposal phase [2], [3]. Thus, the true and compelling measure of the VisiTyre batteryless OEM value proposition is the reduction of the total cost of ownership which is achieved by eliminating the sensor battery and its associated environmental problems and aftermarket and OEM overheads [4], [5].
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References:
[1.] VisiTyre Batteryless TPMS is Number One for Simplicity [PDF]
[2.] The Problems with Batteries used in TPMS [PDF]
[3.] MSDS for Lithium/Thionyl Chloride [PDF]
[4.] Unintended Consequences of US TREAD Act Legislation [PDF]
[5.] VisiTyre's simplicity makes other vendor's "Learn Tool" & tyre fitter procedures redundant - Review this video of typically awkward, costly and complex Learn Tool procedures that VisiTyre now makes redundant.