Battery-free TPMS
The latest vehicles use a TPMS system without any little batteries in the sensors - it relies on the centrifugal action for energy. Do any of the aftermarket TPMS systems for trailers use this tech...
Forum Discussion
wa8yxm wrote:
There multiple TPMS systems. one is hard wired and uses a pipe to the hub.. I see this on trucks but can tell you nothing about it
Those are not a TPMS, rather they're an ATIS, an "Automatic Tire Inflation System". There's a dash mounted controller that tells an on board compressor/solenoid system when to add or remove air to maintain driver selected pressure parameters based on the current load and road conditions. Trucks used in agriculture for field loading, etc., often use lower pressures to increase the contact area in the fields to minimize soil damage and increase traction. When they leave the fields, the driver simply dials the pressure up to highway speed levels on the fly.
