Patent ID: 7385493
Filing Date: 2008-06-10
Classification: B60C

Abstract:
1. A tire inflation pressure detection apparatus, comprising: a detection portion provided in a tire of a vehicle for detecting a tire inflation pressure; a transmitting portion for wirelessly transmitting a signal of the tire inflation pressure information detected by the detection portion; a receiving portion for feeding the signal transmitted from the transmitting portion; a wheel speed sensor for detecting a rotational speed of a wheel of the tire; a control portion for feeding a signal of a wheel speed information from the wheel speed sensor and the signal of the tire inflation pressure information from the receiving portion; an electric power source wire for connecting the wheel speed sensor to the control portion, which is utilized as a receiving antenna of the receiving portion; a signal input wire for connecting the electric power source wire to the receiving portion; a first filter disposed at the signal input wire for transmitting the signal transmitted from the transmitting portion and for blocking a low frequency which includes direct current or an unnecessary high frequency; and a second filter disposed at the electric power source wire between a connection point with the signal input wire and the control portion for blocking the signal transmitted from the transmitting portion.