Direct TPMS, or direct
tire pressure monitoring systems (direct sensor TPMS) refers to the use of a
pressure sensor directly mounted on the wheels or
tires of a vehicle. The pressure inside the tire is measured using a
pressure transducer with the pressure information being subsequently sent to the vehicle to warn the driver of under or over inflation of a tire. The pressure information is commonly transmitted to the vehicle using
radio frequency (RF) technology, though systems using mechanical,
electrical or
magnetic methods have been used over recent years.