Tire air pressure monitor

Details Tire air pressure monitor Tire air pressure monitor

2005-04-12

2005-04-12

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Tire, tread or roadway

C340S442000

Reexamination Certificate

active

06877370

ABSTRACT:
A tire air pressure monitor includes tire air pressure sensors and transmitters proximate to tires; receiving antennas which receive transmitting signals from the transmitters; phase shifters which shift signal phases received from the antennas by control voltages; a synthesizer which synthesizes outputs from the phase shifters; and a meter which detects an output level from the synthesizer. The phase differences between the antennas are different and the control voltages for the phase shifters are obtained in advance, which maximizes the output level from the synthesizer dependent on the tire mounting positions. An association table relates the tire mounting positions to the control voltages and the control voltages are controlled so that the output level from the synthesizer is maximized with respect to a transmitting signal from any one of the tire mounting positions. The tire mounting positions is identified by comparing values of the control voltages thus controlled.

REFERENCES:
patent: 5924055 (1999-07-01), Hattori
patent: 6062072 (2000-05-01), Mock et al.
patent: 6271748 (2001-08-01), Derbyshire et al.
patent: 6463799 (2002-10-01), Oldenettel et al.
patent: 6545599 (2003-04-01), Derbyshire et al.
patent: 6591671 (2003-07-01), Brown
patent: 2538986 (1997-04-01), None

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