Tire pressure monitoring system, detection device and monitoring device
First Claim
1. A tire pressure monitoring system comprising:
- a plurality of detection devices that are provided in respective ones of a plurality of tires of a vehicle and each wirelessly transmit an air pressure signal including air pressure information obtained by detecting air pressure of each of the tires in response to a request signal requesting air pressure of each of the tires; and
a monitoring device that transmits the request signal to each of the plurality of detection devices and receives the air pressure signal transmitted from each of the plurality of detection devices in response to the request signal, to monitor air pressure of each of the tires,whereineach of the plurality of detection devices includesa request signal receiving unit that receives the request signal transmitted from the monitoring device;
a measurement unit that measures a received signal strength of the request signal received by the request signal receiving unit; and
an air pressure signal transmitting unit that transmits to the monitoring device, (i) an air pressure signal including air pressure information obtained by detecting air pressure of a respective tire, (ii) an identifier of a corresponding one of the plurality of detection devices, and (iii) the received signal strength measured by the measurement unit at a different timing in accordance with the received signal strength measured by the measurement unit,the monitoring device includes;
a request signal transmitting unit that transmits the request signal to a region including at least one tire position where one of the tires is provided;
an air pressure signal receiving unit that receives the air pressure signal and the received signal strength from the plurality of detection devices in response to the request signal transmitted by the request signal transmitting unit;
an identifier storage unit that stores (i) plurality of tire positions at which the plurality of tires are respectively provided and (ii) identifiers of the plurality of detection devices respectively provided in the plurality of tires in association with each other;
a selection unit that, in a case where a plurality of air pressure signals are received by the air pressure signal receiving unit, selects one of the air pressure signals received at a specific timing as an air pressure signal transmitted from the one tire position;
an update unit that updates an identifier corresponding to the one tire position stored in the identifier storage unit to an identifier included in the air pressure signal selected by the selection unit; and
a received signal strength storage unit that stores a received signal strength transmitted from a transmission source of the air pressure signal selected by the selection unit;
the request signal transmitting unit of the monitoring device transmits a request signal including a received signal strength stored in the received signal strength storage unit to a region including the one tire position;
the detection device in a case of receiving the request signal including a received signal strength from the monitoring device, compares the received signal strength included in the request signal and a received signal strength measured by the measurement unit, and transmits the air pressure signal to the monitoring device in a case where the compared received signal strengths match.
1 Assignment
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Accused Products
Abstract
A tire pressure monitoring system includes a plurality of detection devices that are provided in respective ones of a plurality of tires of a vehicle and each wirelessly transmit an air pressure signal including air pressure information of tire in response to a request signal and a monitoring device that transmits the request signal to each of the detection devices and receives the air pressure signal transmitted from each of the detection devices in response to the request signal, to monitor air pressure of each of the tires. Each of the detection devices, when receiving a request signal, measures the received signal strength of the received request signal and transmits to the monitoring device an air pressure signal at a different diming in accordance with the measured received signal strength. The monitoring device receives the air pressure signals transmitted from the plurality of detection devices at different timings.
32 Citations
6 Claims
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1. A tire pressure monitoring system comprising:
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a plurality of detection devices that are provided in respective ones of a plurality of tires of a vehicle and each wirelessly transmit an air pressure signal including air pressure information obtained by detecting air pressure of each of the tires in response to a request signal requesting air pressure of each of the tires; and a monitoring device that transmits the request signal to each of the plurality of detection devices and receives the air pressure signal transmitted from each of the plurality of detection devices in response to the request signal, to monitor air pressure of each of the tires, wherein each of the plurality of detection devices includes a request signal receiving unit that receives the request signal transmitted from the monitoring device; a measurement unit that measures a received signal strength of the request signal received by the request signal receiving unit; and an air pressure signal transmitting unit that transmits to the monitoring device, (i) an air pressure signal including air pressure information obtained by detecting air pressure of a respective tire, (ii) an identifier of a corresponding one of the plurality of detection devices, and (iii) the received signal strength measured by the measurement unit at a different timing in accordance with the received signal strength measured by the measurement unit, the monitoring device includes; a request signal transmitting unit that transmits the request signal to a region including at least one tire position where one of the tires is provided; an air pressure signal receiving unit that receives the air pressure signal and the received signal strength from the plurality of detection devices in response to the request signal transmitted by the request signal transmitting unit; an identifier storage unit that stores (i) plurality of tire positions at which the plurality of tires are respectively provided and (ii) identifiers of the plurality of detection devices respectively provided in the plurality of tires in association with each other; a selection unit that, in a case where a plurality of air pressure signals are received by the air pressure signal receiving unit, selects one of the air pressure signals received at a specific timing as an air pressure signal transmitted from the one tire position; an update unit that updates an identifier corresponding to the one tire position stored in the identifier storage unit to an identifier included in the air pressure signal selected by the selection unit; and a received signal strength storage unit that stores a received signal strength transmitted from a transmission source of the air pressure signal selected by the selection unit; the request signal transmitting unit of the monitoring device transmits a request signal including a received signal strength stored in the received signal strength storage unit to a region including the one tire position; the detection device in a case of receiving the request signal including a received signal strength from the monitoring device, compares the received signal strength included in the request signal and a received signal strength measured by the measurement unit, and transmits the air pressure signal to the monitoring device in a case where the compared received signal strengths match. - View Dependent Claims (2, 3, 4)
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5. A detection device of a plurality of detection devices that are provided in respective ones of a plurality of tires of a vehicle and each wirelessly transmit an air pressure signal including air pressure information obtained by detecting air pressure of a respective tire in response to a request signal, the request signal being transmitted by a monitoring device of the vehicle to request the air pressure of the respective tire, the monitoring device including a request signal transmitting unit that transmits the request signal to a region including at least one tire position where one of the tires is provided;
- an air pressure signal receiving unit that receives the air pressure signal and the received signal strength transmitted from each of the plurality of detection devices in response to the request signal transmitted by the request signal transmitting unit;
an identifier storage unit that stores a plurality of tire positions at which the plurality of tires are respectively provided and identifiers of the plurality of detection devices provided in the tires at respective ones of the tire positions in association with each other;
a selection unit that, in a case where a plurality of air pressure signals are received by the air pressure signal receiving unit, selects one of the air pressure signals received at a specific timing as an air pressure signal transmitted from the one tire position;
an update unit that updates an identifier corresponding to the one tire position stored in the identifier storage unit to an identifier included in the air pressure signal selected by the selection unit; and
a received signal strength storage unit that stores a received signal strength transmitted from a transmission source of the air pressure signal selected by the selection unit, the request signal transmitting unit of the monitoring device transmitting a request signal including a received signal strength stored in the received signal strength storage unit to a region including the one tire position, the detection device comprising;a request signal receiving unit that receives the request signal from the monitoring device; a measurement unit that measures a received signal strength of the request signal received by the request signal receiving unit; an air pressure signal transmitting unit that transmits, to the monitoring device, (i) an air pressure signal including air pressure information obtained by detecting air pressure of the respective tire, (ii) an identifier of a corresponding one of the plurality of detection devices, and (iii) the received signal strength measured by the measurement unit, at a different timing in accordance with the received signal strength measured by the measurement unit; and a comparison unit that, in a case that a request signal including a received signal strength stored by the monitoring device is received from the monitoring device compares the received signal strength included in the request signal and a received signal strength measured by the measurement unit, such that the detection device transmits the air pressure signal in a case where the compared received signal strengths match.
- an air pressure signal receiving unit that receives the air pressure signal and the received signal strength transmitted from each of the plurality of detection devices in response to the request signal transmitted by the request signal transmitting unit;
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6. A monitoring device that receives an air pressure signal transmitted from each of a plurality of detection devices that are provided in respective ones of a plurality of tires of a vehicle in response to a request signal requesting air pressure of each of the tires, to monitor air pressure of each of the tires, each of the plurality of detection devices including a request signal receiving unit that receives the request signal transmitted from the monitoring device, a measurement unit that measures a received signal strength of the request signal received by the request signal receiving unit, and an air pressure signal transmitting unit that transmits to the monitoring device, (i) an air pressure signal including air pressure information obtained by detecting air pressure of each of the tires, (ii) an identifier of a corresponding one of the plurality of detection devices, (iii) the received signal strength measured by the measurement unit, at a different timing in accordance with the measured received signal strength, the monitoring device comprising:
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a request signal transmitting unit that transmits the request signal to a region including at least one tire position where one of the tires is provided; an air pressure signal receiving unit that receives an air pressure signal and received signal strength transmitted from each of the detection devices in response to the request signal transmitted by the request signal transmitting unit; an identifier storage unit that stores a plurality of tire positions at which the plurality of tires are respectively provided and identifiers of the plurality of detection devices provided in the tires at respective ones of the tire positions in association with each other; a selection unit that, in a case where a plurality of air pressure signals are received by the air pressure signal receiving unit, selects one of the air pressure signals received at a specific timing as an air pressure signal transmitted from the one tire position; an update unit that updates an identifier corresponding to the one tire position stored in the identifier storage unit to an identifier included in the one of the air pressure signals selected by the selection unit; and a received signal strength storage unit that stores a received signal strength transmitted from a transmission source of the air pressure signal selected by the selection unit, wherein the request signal transmitting unit transmits a request signal including a received signal strength stored in the received signal strength storage unit to a region including the one tire position, and the detection device, in a case of receiving the request signal, compares a received signal strength included in the received request signal and a received signal strength measured by the measurement unit, and transmits the air pressure signal to the monitoring device in a case where the received signal strengths match.
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Specification