Vehicle-tire-state detection/communication apparatus and tire-data communication apparatus

• US 20030197604A1
• Filed: 03/27/2003
• Published: 10/23/2003
• Est. Priority Date: 04/22/2002
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Meguro, Kazuhisa, Tabata, Masaaki, Ogawa, Atsushi, Doi, Takashi, Kusunoki, Hideki, Tomioka, Shinichi
• Granted Patent: US 7,116,218 B2
• Time in Patent Office: Days
• US Class Current: 340/445
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
• CPC Class Codes: B60C 23/0462 Structure of transmission protocol
• CPC Class Codes: B60C 23/0488 Movement sensor, e.g. for sensing angular speed, acceleration or centripetal force

Abstract

A detection/communication apparatus to be installed on a vehicle having a plurality of tires. The apparatus includes: (a) tire state detectors which are provided on the respective tires and each of which detects a state of a corresponding one of the tires; (b) local transceivers which are provided on the respective tires and which transmit tire data sets relating to the respective tires; (c) a central receiver which is provided on a vehicle body and which receives the tire data sets transmitted by the local transceivers; (d) a particular-signal transmitter which is provided on the vehicle body and which transmits a particular signal; and (e) data-transmission modifiers which are provided on the respective tires. Each of the data-transmission modifiers is operable depending upon a state of reception of the particular signal by a corresponding one of the local transceivers, to modify transmission of a corresponding one of the tire data sets by the corresponding one of the local transceivers.

Claims

1. A detection/communication apparatus to be installed on a vehicle having a plurality of tires, said apparatus comprising:

tire state detectors which are provided on the respective tires and each of which detects a state of a corresponding one of said tires;

local transceivers which are provided on the respective tires and which transmit tire data sets relating to the respective tires, each of said tire data sets including at least one tire-state data element representative of the detected state of a corresponding one of said tires;

a central receiver which is provided on a body of the vehicle and which receives said tire data sets transmitted by said local transceivers;

a particular-signal transmitter which is provided on the body of the vehicle and which transmits a particular signal; and

data-transmission modifiers which are provided on the respective tires, each of said data-transmission modifiers being operable depending upon a state of reception of said particular signal by a corresponding one of said local transceivers, to modify transmission of a corresponding one of said tire data sets by said corresponding one of said local transceivers.

2. A detection/communication apparatus according to claim 1,

wherein said particular-signal transmitter transmits said particular signal such that said particular signal is receivable by one of said local transceivers that is provided on a selected one of the tires, while said particular signal is unreceivable by the other of said local transceivers,

and wherein a corresponding one of said data-transmission modifiers which is provided on said selected one of the tires is operated in response to reception of said particular signal by said one of said local transceivers, to modify transmission of a corresponding one of said tire data sets by said one of said local transceivers.

3. A detection/communication apparatus according to claim 1, wherein each of said data-transmission modifiers includes a transmission restrictor operable to restrict transmission of said corresponding one of said tire data sets by said corresponding one of said local transceivers.

4. A detection/communication apparatus according to claim 1, wherein each of said data-transmission modifiers includes a data-element content changer operable to change a content of a data element included in said corresponding one of said tire data sets that is transmitted by said corresponding one of said local transceiver, such that the changed content of said data element included in said corresponding one of said tire data sets is different from that of said data element included in the other of said tire data sets.

5. A detection/communication apparatus according to claim 1, wherein each of said data-transmission modifier includes a data-amount changer operable to change a data amount of said corresponding one of said tire data sets that is transmitted by said corresponding one of said local transceivers, such that the changed data amount of said corresponding one of said tire data sets is different from that of the other of said tire data sets.

6. A detection/communication apparatus according to claim 1, wherein each of said data-transmission modifiers includes a transmission-interval changer operable to change a time interval at which said corresponding one of said tire data sets is transmitted by said corresponding one of said local transceivers, such that the changed time interval is different from a time interval of transmission of the other of said tire data sets.

7. A detection/communication apparatus according to claim 1, further comprising:

a data processor which is provided on the body of the vehicle and which is capable of determining whether the transmission of each of said tire data sets has been modified or not, so that said data processor can process said each of said tire data sets in one of different processing manners that is selected depending upon whether the transmission of said each of said tire data sets has been modified or not.

8. A detection/communication apparatus according to claim 7, wherein said data processor includes a reference-value changing portion which changes a reference value to be used for checking a tire-state-related value represented by each of said at least one tire-state data element of said corresponding one of said tire data sets whose transmission has been modified, such that the changed reference value is different from a reference value to be used for checking a tire-state-related value represented by each of said at least one tire-state data element of the other of said tire data sets whose transmission has not been modified.

9. A detection/communication apparatus according to claim 1,

wherein the plurality of tires of the vehicle includes a mounted tire mounted on an axle of the vehicle and a non-mounted tire carried by the vehicle,

and wherein said particular-signal transmitter transmits said particular signal such that said particular signal is receivable by one of said local transceivers that is provided on said non-mounted tire while said particular signal is unreceivable by one of said local transceivers that is provided on said mounted tire.

10. A detection/communication apparatus according to claim 9,

wherein said particular-signal transmitter includes a transmitting antenna by which said particular signal is transmitted,

and wherein said transmitting antenna has at least one of an output strength and a directivity which enables said particular signal to be received by said one of said local transceivers provided on said non-mounted tire, and which disables said particular signal to be received by said one of said local transceivers provided on said mounted tire.

17. A detection/communication apparatus according to claim 1, wherein said local transceivers transmit said tire data sets at respective time intervals different from each other.

11. A detection/communication apparatus to be installed on a vehicle having a plurality of tires which include a mounted tire mounted on an axle of the vehicle and a non-mounted tire carried by the vehicle, said apparatus comprising:

tire state detectors which are provided on the respective tires and each of which detects a state of a corresponding one of said tires;

local transceivers which are provided on the respective tires and which transmit tire data sets relating to the respective tires, each of said tire data sets including at least one tire-state data element representative of the detected state of a corresponding one of said tires;

a central receiver which is provided on a body of the vehicle and which receives said tire data sets transmitted by said local transceivers;

non-mounted-tire detectors which are provided on the respective tires and each of which effects a determination as to whether a corresponding one of the tires is said non-mounted tire or not; and

data-transmission modifiers which are provided on the respective tires, each of said data-transmission modifiers being operable in response to an affirmative decision by a corresponding one of said non-mounted-tire detectors in said determination, to modify transmission of a corresponding one of said tire data sets to said central receiver.

12. A detection/communication apparatus according to claim 11, wherein each of said non-mounted tire detectors includes an information-basis detecting portion which effects said determination on the basis of information received by a corresponding one of said local transceivers.

13. A detection/communication apparatus according to claim 12, further comprising:

a particular-signal transmitter which is provided on the body of the vehicle and which transmits a particular signal,

wherein said information-basis determining portion includes a particular-signal-basis determining portion which determines that said corresponding one of the tires is said non-mounted tire if said particular signal is received by said corresponding one of said local transceivers.

14. A detection/communication apparatus according to claim 11, wherein each of said non-mounted tire detectors includes a tire-state-basis determining portion which effects said determination on the basis of the state of said corresponding one of the tires.

15. A detection/communication apparatus according to claim 14,

wherein each of said tire state detectors includes a tire-motion detector which detects a motion of a corresponding one of said tires,

and wherein said tire-state-basis determining portion includes a tire-motion-basis determining portion which effects said determination on the basis of the detected motion of said corresponding one of the tires.

16. A detection/communication apparatus to be installed on a vehicle having a plurality of tires which include a mounted tire mounted on an axle of the vehicle and a non-mounted tire carried by the vehicle, said apparatus comprising:

tire state detectors which are provided on the respective tires and each of which detects a state of a corresponding one of said tires;

local transceivers which are provided on the respective tires; and

a central receiver which is provided on a body of the vehicle and which includes a non-mounted-tire-signal receiving antenna,

wherein said non-mounted-tire-signal receiving antenna has at least one of a sensitivity and a directivity which enables said receiving antenna to receive a signal transmitted from one of said local transceivers provided on said non-mounted tire, and which disables said receiving antenna to receive a signal transmitted from one of said local transceivers provided on said mounted tire.

18. A detection/communication apparatus to be installed on a vehicle having a plurality of tires which include a regular tire and a temporary tire, said apparatus comprising:

a regular-tire state detector which is provided on said regular tire and which detects a state of said regular tire;

a temporary-tire state detector which is provided on said temporary tire and which detects a state of said temporary tire;

a regular-tire data transmitter which is provided on said regular tire and which transmits a regular-tire data set relating to said regular tire, said regular-tire data set including at least one regular-tire-state data element representative of the detected state of said regular tire;

a temporary-tire data transmitter which is provided on said temporary tire and which transmits a temporary-tire data set relating to said temporary tire, said temporary-tire data set including at least one temporary-tire-state data element representative of the detected state of said temporary tire, and having a data amount smaller than that of said regular-tire data set;

a central receiver which is provided on a body of the vehicle and which receives said regular-tire data set and said temporary-tire data set transmitted by said regular-tire data transmitter and said temporary-tire data transmitter, respectively; and

a data processor which processes said regular-tire data set in a regular-tire data processing manner and which processes said temporary-tire data set in a temporary-tire data processing manner that is different from said regular-tire data processing manner.

19. A detection/communication apparatus according to claim 18,

wherein said at least one regular-tire data element of said regular-tire data set includes a data element representative of an air pressure value of said regular tire detected by said regular-tire state detector while said at least one temporary-tire data element of said temporary-tire data set includes a data element representative of an air pressure value of said temporary tire detected by said temporary-tire state detector,

and wherein said data processor includes an air-pressure abnormality detector which detects an abnormality of said air pressure value of said regular tire, by checking if said air pressure value of said regular tire is lower than a first minimum value, and which detects an abnormality of said air pressure value of said temporary tire, by checking if said air pressure value of said temporary tire is lower than a second minimum value that is higher than said first minimum value.

20. A communication apparatus to be installed on a vehicle having a plurality of tires which include a mounted tire mounted on an axle of the vehicle and a non-mounted tire carried by the vehicle, said apparatus comprising:

local transceivers which are provided on the respective tires and which transmit tire data sets relating to the respective tires;

a central receiver which is provided on a body of the vehicle;

a particular-signal transmitter which is provided on the body of the vehicle and which transmits a particular signal; and

non-mounted-tire-data transmission commanders which are provided on the respective tires, each of said non-mounted-tire-data transmission commanders being operable depending upon a state of reception of said particular signal by a corresponding one of said local transceivers, to command said corresponding one of said local transceivers to transmit a corresponding one of said tire data sets as a non-mounted-tire data set relating to said non-mounted tire.

21. A communication apparatus according to claim 20, further comprising:

data-transmission modifiers which are provided on the respective tires, each of said data-transmission modifiers being operable together with a corresponding one of said transmission commanders, to modify transmission of said corresponding one of said tire data sets by said corresponding one of said local transceivers.