Vehicle-state obtaining apparatus

• US 20040230350A1
• Filed: 04/30/2004
• Published: 11/18/2004
• Est. Priority Date: 05/12/2003
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ogawa, Atsushi, Taki, Yuji
• Application Number:
  US10/835,613
• Publication Number:
  US 20040230350A1
• Time in Patent Office: Days
• US Class Current: 701/1
• CPC Class Codes: B60C 23/0416 allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right
• CPC Class Codes: B60C 23/0442 the transmitted signal comprises further information, e.g. instruction codes, sensor characteristics or identification data
• CPC Class Codes: B60C 23/045 Means for detecting electromagnetic field changes being not part of the signal transmission per se, e.g. strength, direction, propagation or masking
• CPC Class Codes: B60C 23/0464 to avoid signal interference
• CPC Class Codes: B60C 23/0466 with signals sent by transmitters mounted on adjacent vehicles

Abstract

A vehicle-state obtaining apparatus, comprising (a) a sensing device including at least one sensor detecting a state of a vehicle and operable to transmit, by radio communication, sensor information including the vehicle state detected by the sensor, and (b) an information processing device operable to receive the sensor information and obtain the vehicle state on the basis of the received sensor information, wherein the information processing device obtains the vehicle state when it is recognized by one-way or two-way communication of key information between the information processing device and the sensing device that these two devices correspond to each other.

Claims

1. A vehicle-state obtaining apparatus comprising:

a sensing device including at least one sensor to detect a state of at least a portion of a vehicle, and operable to transmit, by radio communication, sensor information including the state detected by said at least one sensor; and

an information processing device operable to receive said sensor information and obtain the state of the vehicle on the basis of the received sensor information,

wherein said information processing device comprises an initiating portion which initiates an operation to obtain the state of the vehicle when it is recognized by one-way or two-way communication of key information between the information processing device and the sensing device that said sensing device and said information processing device correspond to each other.

2. The vehicle-state obtaining apparatus according to claim 1, wherein at least one of said sensing device and said information processing device includes a key-information transmitting portion operable to change at least one of a previously transmitted set of key information and a presently received set of key information according to a predetermined information changing rule, and transmit the changed set of key information.

3. The vehicle-state obtaining apparatus according to claim 2, wherein at least one of said sensing device and said information processing device includes a recognizing portion operable to recognize, on the basis of at least said predetermined information changing rule, that said sensing device and said information processing device correspond to each other.

4. The vehicle-state obtaining apparatus according to claim 3, wherein said initiating portion initiates the operation to obtain the state of the vehicle when said recognizing portion has recognized that said sensing device and the information processing device correspond to each other.

5. The vehicle-state obtaining apparatus according to claim 1, wherein each of said sensing device and said information processing portion includes a receiving portion operable to receive the key information, a changing portion operable to change the received key information according to a predetermined information changing rule, and a transmitting portion operable to transmit the key information changed by said changing portion.

6. The vehicle-state obtaining apparatus according to claim 5, wherein said changing portion of said sensing device and said changing portion of said information processing device change the key information according to predetermined information changing rules which are known to both of the changing portions of said sensing device and said information processing device.

7. The vehicle-state obtaining apparatus according to claim 5, wherein said changing portion of said sensing device and said changing portion of said information processing device change the key information according to a predetermined same information changing rule.

8. The vehicle-state obtaining apparatus according to claim 3, wherein said information processing device includes said recognizing portion, and is operable to obtain the state of the vehicle on the basis of said sensor information, when said recognizing portion has recognized that the sensing device and the information processing device correspond to each other, said information processing device being inoperable to obtain the state of the vehicle when said recognizing portion has not recognized that the sensing device and the information processing device correspond to each other.

9. The vehicle-state obtaining apparatus according to claim 8, wherein said sensing device includes said key-information transmitting portion, and a sensor-information transmitting portion operable to transmit said sensor information together with said changed set of key information.

10. The vehicle-state obtaining apparatus according to claim 3, wherein said sensing device includes said recognizing portion, and is operable to transmit said sensor information, -when said recognizing portion has recognized that the sensing device and the information processing device correspond to each other, said sensing device being inoperable to transmit said sensor information, when said recognizing portion has not recognized that the sensing device and the information processing device correspond to each other.

11. The vehicle-state obtaining apparatus according to claim 10, wherein said information processing device includes said key-information transmitting portion, and a request-signal transmitting portion operable to transmit, together with said changed set of key information, a request signal requesting said sensing device to transmit said sensor information.

12. The vehicle-state obtaining apparatus according to claim 3, wherein said sensing device includes said key-information transmitting portion, and a changing portion operable to change a previously transmitted set of key information according to said predetermined information changing rule, and transmit the changed set of key information, and said information processing device includes said recognizing portion, sad recognizing portion recognizing, on the basis of at least a plurality of sets of key information received from said sensing device, that the sensing device corresponds to said information processing device.

13. The vehicle-state obtaining apparatus according to claim 3, wherein said sensing device includes said key-information transmitting portion, and a changing portion operable to change a previously transmitted set of key information according to said predetermined information changing rule, and transmit the changed set of key information, and said information processing device includes a rule-obtaining portion operable to obtain the predetermined information changing rule used by said changing portion of said sensing device, on the basis of a plurality of sets of key information received from said sensing device.

14. The vehicle-state obtaining apparatus according to claim 1, wherein said sensing device is provided on each of a plurality of wheels of said vehicle, and said at least one sensor includes at least one sensor (50) operable to detect a state of the corresponding wheel, said senor information transmitted by said sensing device including the detected state of said corresponding wheel.

15. The vehicle-state obtaining apparatus according to claim 14, wherein said information processing device is provided on a body of said vehicle, and includes a wheel-state obtaining portion operable to obtain the state of said corresponding wheel on the basis of said sensor information transmitted from said sensing devices.

16. A vehicle-state obtaining device comprising:

a plurality of wheel-side devices provided on a plurality of wheels of a vehicle, respectively, each of said wheel-side devices including at least one sensor to detect a state of a corresponding one of said wheels, said each wheel-side device being operable to transmit wheel information including the state of said corresponding wheel detected by said at least one sensor; and

a body-side device provided on a body of the vehicle and including an information processing device operable to obtain the states of said plurality of wheels on the basis of said sensor wheel transmitted by said plurality of wheel-side devices, wherein two-way communication of information is effected between said plurality of wheel-side devices and said body-side device,

wherein said body-side device includes a plurality of body-side transmitting portions which are provided for said plurality of wheels, respectively, and which transmit respective different kinds of information,

and each of said plurality of wheel-side devices includes a reception-state obtaining portion operable to obtain a state of reception of at least one of said different kinds of information transmitted by at least one of said body-side transmitting portions,

and wherein one of said information processing device and said each wheel-side device includes a specific-information obtaining portion operable to obtain specific information indicative of said each wheel-side device, on the basis of said state of reception obtained by said reception-state obtaining portion.

17. The vehicle-state obtaining apparatus according to claim 16, wherein each of said plurality of wheel-side devices includes a reception-state-information transmitting portion operable to generate reception-state information indicative of the state of reception obtained by said reception-state obtaining portion and to transmit the generated reception-state information, and said specific-information obtaining portion is provided on said information processing device and includes a relative-position obtaining portion operable to obtain, as said specific information, information indicative of a position of each of said wheel-side devices relative to the body of the vehicle, on the basis of said reception-state information transmitted from said reception-state-information transmitting portion.

18. The vehicle-state obtaining apparatus according to claim 16, wherein each of said wheel-side devices includes a receiving portion operable to receive the information from at least one of said body-side transmitting portions, a received-information memory portion for storing the information received by said receiving portion, and a reception-state-information generating portion operable to generate said reception-state information on the basis of the information stored in said received-information memory portion, said reception-state-information transmitting portion transmitting said reception-state information generated by said reception-state-information generating portion.

19. The vehicle-state obtaining apparatus according to claim 16, wherein each of said wheel-side devices includes an identification-data transmitting portion operable to transmit identification data identifying said each wheel-side device, such that said identification data are transmitted together with said reception-state information transmitted by said reception-state-information transmitting portion.

20. The vehicle-state obtaining apparatus according to claim 16, wherein said information processing device of said body-side device includes a transmission control portion operable to control at least one of said body-side transmitting portions, on the basis of said reception-state information transmitted by said reception-state-information transmitting portion of said each wheel-side device.

21. The vehicle-state obtaining apparatus according to claim 20, wherein said transmission control portion includes a transmission-state changing portion operable to change at least one of:

a transmission intensity of said at least one body-side transmitting portion;

a frequency of the information to be transmitted from said at least one body-side transmitting portion;

a pattern of transmission of the information from each of said at least one body-side transmitting portion; and

a frequency at which the information is transmitted by each of said at least one body-side transmitting portion.

22. The vehicle-state obtaining apparatus according to claim 20, wherein each of the plurality of wheel-side devices further includes a highest-reception-ratio-information generating portion operable to generate, as said reception-state information to be transmitted by said reception-state-information transmitting portion, highest-reception-ratio information indicating one of said different kinds of information which has been received by said each wheel-side device with a highest ratio of reception among said different kinds, said information processing device of said body-side device further including a transmission-intensity control portion which is operable, when said highest-reception-ratio information indicates that any one of said different kinds of information has been received with the highest ratio of reception by at least two of said wheel-side devices, to reduce a transmission intensity of one of said body-side transmitting portions which has transmitted said any one of said different kinds of information, said transmission-intensity control portion being further operable, when said highest-reception-ratio information indicates that any one of said different kinds of information has not been received with the highest ratio of reception by any of said wheel-side devices, to increase a transmission intensity of one of said body-side transmitting portions which has transmitted said any one of said different kinds of information which has not been received with the highest ratio of reception by any of the wheel-side devices.

23. The vehicle-state obtaining apparatus according to claim 16, wherein each of said wheel-side devices obtains a ratio of reception of each of said at least one of said different kinds of information transmitted by said at least one of said body-side transmitting portions, and includes a received-information memory portion for storing one of said different kinds of information which has been received with a highest ratio of reception by said each wheel-side device among said different kinds.

24. The vehicle-state obtaining apparatus according to claim 16, wherein each of said plurality of wheel-side devices obtains, as said specific information, specific body-side information on the basis of the state of reception detected by said reception-state obtaining portion, said specific body-side information consisting of a specific one of said different kinds of information which has been transmitted from a corresponding one of said plurality of body-side transmitting portions,

and wherein said each wheel-side device includes a specific-body-side-information memory portion for storing said specific body-side information.

25. The vehicle-state obtaining apparatus according to claim 24, wherein said plurality of body-side transmitting portions include respective wheel-position-data transmitting portions operable to transmit respective different kinds of wheel position data indicative of respective positions of said plurality of wheels relative to said body of the vehicle, and said specific-body-side-information memory portion of said each wheel-side device includes a wheel-position-data memory portion for storing one of said different kinds of wheel position data which is determined as identification data, identifying said each wheel-side device, on the basis of a state of reception of at least one of said different kinds of wheel position data transmitted by at least one of said body-side transmitting portions.

26. The vehicle-state obtaining apparatus according to claim 24, wherein each of said plurality of wheel-side devices includes a received-information memory portion operable to store a predetermined maximum number of sets of said different kinds of information transmitted from said body-side transmitting portions, and a specific-body-side-information determining portion operable to determine said specific body-side information on the basis of the sets of said different kinds of information stored in said received-information memory portion.

27. The vehicle-state obtaining apparatus according to claim 26, each of said plurality of wheel-side devices includes an identification-data obtaining portion operable to determine, as identification data identifying said each wheel-side device, one of said different kinds of information which has been transmitted from a corresponding one of said plurality of body-side transmitting portions.

28. A vehicle-state obtaining apparatus comprising:

a plurality of wheel-side devices provided on a plurality of wheels of a vehicle, respectively, each of said wheel-side devices including a sensor to detect a state of a corresponding one of said wheels, said each wheel-side device being operable to transmit wheel information including the state of said corresponding wheel detected by said sensor; and

a body-side device provided on a body of the vehicle and including an information processing device operable to obtain the states of said plurality of wheels on the basis of said wheel information transmitted by said plurality of wheel-side devices, wherein two-way communication of information is effected between said plurality of wheel-side devices and said body-side device,

wherein said body-side device includes a plurality of body-side transceiver portions which are provided for said plurality of wheels, respectively, and a transmission control portion operable to sequentially operate said plurality of body-side transceiver portions such that when information is transmitted by~each one of said body-side transceiver devices, no information is transmitted by the other of said body-side transceiver portions,

each of said plurality of wheel-side devices including an answering-information transmitting portion operable to transmit answering information corresponding to the information received from said body-side transceiver devices,

said information processing device of said body-side device including a relative-position obtaining portion operable to obtain a position of each of said wheel-side devices relative to the body of the vehicle on the basis of said answering information as received from said answering-information transmitting portion.

29. The vehicle-state obtaining apparatus according to claim 28, wherein said information processing device of said body-side device includes a transmission-reception-state control portion operable when said information processing device has received said answering information from at least two devices of said plurality of wheel-side devices in response to the information transmitted from one of said body-side transceiver portions, said transmission-reception-state control portion being reducing at least one of a transmission intensity and a reception sensitivity of said one body-side transceiver portion, until said information processing device receives the answering information from only one of said plurality of wheel-side devices.

30. The vehicle-state obtaining apparatus according to claim 29, wherein said transmission-reception-state control portion gradually reduces at least one of said transmission intensity and said reception sensitivity of said one body-side transceiver portion.

31. The vehicle-state obtaining apparatus according to claim 30, wherein said answering-information transmitting portion changes the information received from each of said body-side transceiver portions, into said answering information, according to a predetermined information changing rule, and said information processing device of said body-side device includes a changed-information transmitting portion operable to change said answering information according to a predetermined information changing rule and transmit the changed answering information.

32. The vehicle-state obtaining apparatus according to claim 31, wherein said information processing device of said body-side device includes an answering-information memory portion operable when said information processing device has received said answering information from only one of said plurality of wheel-side devices in response to the information transmitted from one of said body-side transceiver portions, said answering-information memory portion storing therein the received answering information in relation to said one body-side transceiver portion.

33. The vehicle-state obtaining apparatus according to claim 32, wherein at least one of each of said plurality of said wheel-side devices and said information processing device includes an answering-information-transmission inhibiting portion which is operable, when said answering information has been stored in said answering-information memory portion, to inhibit subsequent transmission of the answering information from said one wheel-side device.

34. The vehicle-state obtaining apparatus according to claim 28, wherein said body-side device includes a request-signal transmitting portion operable to transmit, through said body-side transceiver portions, different kinds of specifying information corresponding to said plurality of wheel-side devices, respectively, and a request signal requesting each of said wheel-side devices to transmit said wheel information,

and wherein each of said plurality of wheel-side devices further includes a wheel-information transmitting portion operable to transmit said wheel information when one of said different kinds of specifying information which has been received by said each wheel-side device from said request-signal transmitting portion specifies said each wheel-side device, said wheel-information transmitting portion being inoperable when said one kind of specifying information does not specify said each wheel-side device.

35. A vehicle-state obtaining apparatus comprising:

a plurality of wheel-side devices provided on a plurality of wheels of a vehicle, respectively, each of said wheel-side devices including at least one sensor to detect a state of a corresponding one of said wheels, said each wheel-side device being operable to transmit wheel information including the state of said corresponding wheel detected by said at least one sensor; and

a body-side device provided on a body of the vehicle and including an information processing device operable to obtain the states of said plurality of wheels on the basis of said wheel information transmitted by said plurality of wheel-side devices,

wherein each of said plurality of wheel-side devices includes a positional-information obtaining portion operable to obtain positional information relating to a position of a corresponding one of said plurality of wheels in a coordinate system common to all of said plurality of wheels, and a positional-information transmitting portion operable to transmit said positional information obtained by said positional-information obtaining portion.

36. The vehicle-state obtaining apparatus according to claim 35, wherein said body-side device includes a relative-position obtaining portion operable to obtain a position of each of said wheels relative to said body of the vehicle, on the basis of the positional information received from a corresponding one of said plurality of wheel-side devices before a movement of the vehicle in said coordinate system and the positional information received from said corresponding wheel-side device after said movement.