What is the difference between a TPMS system and PKE system? Nothing! A TPMS system is placed inside the wheel and composed of a sensing device that measures temperature and pressure. When appropriate, such as before starting the engine, the car requests a measurement through a wireless link. If a pressure default occurs in one of the wheels, the car warns rnthe driver through a signal on the dashboard. In PKE applications, the user carries a key fob device which contains an encoded identifier (ID). When the driver enters their car, the car requests the key fob ID through the wireless link. If the ID matches the ID stored by the car, the car doors will be unlocked. In both cases, a car requests security rninformation from a remote device. In TPMS, the data correspond to the pressure of the tires, whereas in PKE the data identity a person. In both cases, an "incorrect" response from the remote device (low pressure detected or a car owner ID mismatch) should inhibit the use of the car.
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