Title:
タイヤ空気圧監視装置とその監視方法
Document Type and Number:
Japanese Patent JP4012034
Kind Code:
B2
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.
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Inventors:
Hideki Masuda
Application Number:
JP2002300444A
Publication Date:
November 21, 2007
Filing Date:
October 15, 2002
Export Citation:
Assignee:
ALPS ELECTRIC CO.,LTD.
International Classes:
B60C23/00; G08C17/02; B60C23/04; G01S5/06
Domestic Patent References:
| JP2001060905A | ||||
| JP6188784A | ||||
| JP2002240521A | ||||
| JP2003002020A | ||||
| JP2002324292A | ||||
| JP10504783A |
Foreign References:
| WO2002039137A1 | ||||
| US20020044050 |
Attorney, Agent or Firm:
Kenjiro Take
Ichiro Suzuki
Hirohiro Ichimura
Kazuo Kobayashi
Ichiro Suzuki
Hirohiro Ichimura
Kazuo Kobayashi