Wheel information acquiring system
First Claim
Patent Images
1. A wheel information acquiring system that is attached to a wheel and acquires wheel information of the wheel during rotation, the wheel information acquiring system comprising:
- a first communication device that is attached to the wheel and detects wheel information associated with the wheel during rotation, and wirelessly transmits the detected wheel information from a wheel side; and
a second communication device that is provided apart from the wheel and that receives and acquires the wheel information transmitted by the first communication device, wherein;
the first communication device has a maximum value of rotation speed specified for the wheel during rotation to which the first communication device is attached; and
when a transmission time width of one packet of the wheel information transmitted by the first communication device is represented by T1, and an expected minimum rotation period which is determined according to the maximum value of the rotation speed prespecified in the first communication device is represented by R1, the T1 is set so as to satisfy T1≦
R1·
½
, and whereinthe first communication device transmits, in addition to the wheel information, power supply voltage information of the first communication device.
1 Assignment
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Accused Products
Abstract
Acquired wheel information such as temperature data and inflation pressure data is surely transmitted from a transmitter in a status where the transmitter is not located in a dead space, by controlling timing wherein the transmitter acquires the wheel information, a transmission time width and transmitting timing of the data to be transmitted from the transmitter by radio.
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Citations
25 Claims
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1. A wheel information acquiring system that is attached to a wheel and acquires wheel information of the wheel during rotation, the wheel information acquiring system comprising:
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a first communication device that is attached to the wheel and detects wheel information associated with the wheel during rotation, and wirelessly transmits the detected wheel information from a wheel side; and a second communication device that is provided apart from the wheel and that receives and acquires the wheel information transmitted by the first communication device, wherein; the first communication device has a maximum value of rotation speed specified for the wheel during rotation to which the first communication device is attached; and when a transmission time width of one packet of the wheel information transmitted by the first communication device is represented by T1, and an expected minimum rotation period which is determined according to the maximum value of the rotation speed prespecified in the first communication device is represented by R1, the T1 is set so as to satisfy T1≦
R1·
½
, and whereinthe first communication device transmits, in addition to the wheel information, power supply voltage information of the first communication device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A wheel information acquiring system that is attached to a wheel and acquires wheel information of the wheel during rotation, the wheel information acquiring system comprising:
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a first communication device that is attached to the wheel and detects wheel information associated with the wheel during rotation, and repeatedly transmits by wireless the detected wheel information from a wheel side with repetition of a number of repeat times PN (times); and a second communication device that is provided apart from the wheel and that receives and acquires the wheel information transmitted by the first communication device, wherein; the first communication device has a minimum value of rotation speed specified for the wheel during rotation to which the first communication device is attached; and when a repeat transmission time width between start of first wheel information transmission and completion of PN-th wheel information transmission is represented by T4, and an expected maximum rotation period of the vehicle which is determined according to the minimum value of the rotation speed prespecified in the first communication device is represented by R2, the T4 is set so as to satisfy R2·
1/12≦
T4, and whereinthe first communication device transmits, in addition to the wheel information, power supply voltage information of the first communication device. - View Dependent Claims (14, 15, 16, 17)
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18. A wheel information acquiring system that is attached to a wheel and acquires wheel information of the wheel during rotation, the wheel information acquiring system comprising:
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a first communication device that is attached to the wheel and detects wheel information associated with the wheel during rotation, and repeatedly transmits by wireless the detected wheel information from a wheel side with a repetition of a number of repeat times PN (times); and a second communication device that is provided apart from the wheel and that receives and acquires the wheel information transmitted by the first communication device, wherein; the first communication device has a maximum value and a minimum value of rotation speed specified for the wheel during rotation to which the first communication device is attached; when a transmission time width of one packet of the wheel information transmitted by the first communication device is represented by T1, and an expected minimum rotation period of the vehicle which is determined according to the maximum value of the rotation speed prespecified in the first communication device is represented by R1, the T1 is set so as to satisfy T1≦
R1·
½
; andwhen a repeat transmission time width between start of first wheel information transmission and completion of PN-th wheel information transmission is represented by T4, and an expected maximum rotation period of the vehicle which is determined according to the minimum value of the rotation speed prespecified in the first communication device is represented by R2, the T4 is set so as to satisfy R2·
1/12≦
T4, and whereinthe first communication device transmits, in addition to the wheel information, power supply voltage information of the first communication device. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A wheel information acquiring system that is attached to a wheel and acquires wheel information of the wheel during rotation, the wheel information acquiring system comprising:
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a first communication device that is attached to the wheel and detects wheel information associated with the wheel during rotation, and wirelessly transmits the detected wheel information from a wheel side; and a second communication device that is provided apart from the wheel and that receives and acquires the wheel information transmitted by the first communication device, wherein; the first communication device has a maximum value of rotation speed specified for the wheel during rotation to which the first communication device is attached; and when a transmission time width of one packet of the wheel information transmitted by the first communication device is represented by T1, and an expected minimum rotation period which is determined according to the maximum value of the rotation speed prespecified in the first communication device is represented by R1, the T1 is set so as to satisfy T1≦
R1·
½
, and whereinthe first communication device detects the wheel information at an acquiring time interval T2, repeatedly transmits the detected wheel information at each detection a number of repeat times PN (times), in repeating the transmission of same wheel information a number of repeat times PN (times), when a repeat transmission time width between start of first wheel information transmission and completion of PN-th wheel information transmission is represented by T4, the transmission time width T1, the number of repeat times PN, and the repeat transmission time width T1 are set so as to satisfy T1·
PN≦
T4·
¼
.
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25. A wheel information acquiring system that is attached to a wheel and acquires wheel information of the wheel during rotation, the wheel information acquiring system comprising:
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a first communication device that is attached to the wheel and detects wheel information associated with the wheel during rotation, and repeatedly transmits by wireless the detected wheel information from a wheel side with a repetition of a number of repeat times PN (times); and a second communication device that is provided apart from the wheel and that receives and acquires the wheel information transmitted by the first communication device, wherein; the first communication device has a maximum value and a minimum value of rotation speed specified for the wheel during rotation to which the first communication device is attached; when a transmission time width of one packet of the wheel information transmitted by the first communication device is represented by T1, and an expected minimum rotation period of the vehicle which is determined according to the maximum value of the rotation speed prespecified in the first communication device is represented by R1, the T1 is set so as to satisfy T1≦
R1·
½
; andwhen a repeat transmission time width between start of first wheel information transmission and completion of PN-th wheel information transmission is represented by T4, and an expected maximum rotation period of the vehicle which is determined according to the minimum value of the rotation speed prespecified in the first communication device is represented by R2, the T4 is set so as to satisfy R2·
1/12≦
T4, and whereinthe first communication device detects the wheel information at an acquiring time interval T2, repeatedly transmits the detected wheel information at each detection a number of repeat times PN (times), in repeating the transmission of same wheel information a number of repeat times PN (times), when a repeat transmission time width between start of first wheel information transmission and completion of PN-th wheel information transmission is represented by T4, the transmission time width T1, the number of repeat times PN, and the repeat transmission time width T4 are set so as to satisfy T1·
PN≦
T4·
¼
.
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Specification