Patent ID: 8674821
Filing Date: 2014-03-18
Classification: B60C

Abstract:
1. A tire pressure monitoring apparatus comprising: a plurality of transceivers, each of which is mounted on a respective wheel having a tire in a vehicle; a receiver mounted on a body of the vehicle; and a warning device receiving a warning signal transmitted from the receiver, wherein each transceiver includes a sensing unit, a first control unit and a transmitting unit, wherein the sensing unit outputs the tire pressure signal, the first control unit processes the tire pressure signal outputted by the sensing unit to a processed tire pressure signal, and the transmitting unit transmits the processed tire pressure signal to the receiver, wherein the receiver includes a receiving unit and a second control unit, wherein the receiving unit receives the processed tire pressure signal, wherein the second control unit calculates a tire pressure according to the processed tire pressure signal and activates the warning device when the tire pressure is lower than an alarm threshold value, wherein the second control unit sets a selected threshold value as the alarm threshold value, and the selected threshold value is initially set by a user, wherein each transceiver or the receiver includes a determination unit, which determines whether the tire pressure increases while the vehicle is parked, and wherein when the determination unit determines that a current tire pressure is increased compared with a previous tire pressure while the vehicle is parked, the second control unit calculates the selected threshold value according to the current tire pressure, and stores the selected threshold value.