Vehicle wheel information supply device and wheel tire abnormality indicating device

• US 6,275,148 B1
• Filed: 12/17/1999
• Issued: 08/14/2001
• Est. Priority Date: 12/25/1998
• Status: Expired due to Term

• Current Assignee: DENSO Corporation, Pacific Industrial Company Limited, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: DENSO Corporation, Pacific Industrial Company Limited, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Tsuchiya, Takayuki, Katou, Mitiya, Banno, Mitsuyuki, Ooe, Junzo, Takamura, Yoshinori
• Primary Examiner(s): Hofsass, Jeffery
• Assistant Examiner(s): TWEEL JR, JOHN ALEXANDER
• Application Number:
  US09/466,073
• Time in Patent Office: 606 Days
• Field of Search: 340/442, 340/443, 340/444, 340/445, 340/447, 340/461, 340/525, 731/465, 731/464, 116/34.R, 180/197, 180/290
• US Class Current: 340/442
• 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 23/0474 Measurement control, e.g. setting measurement rate or calibrating of sensors; Further processing of measured values, e.g. filtering, compensating or slope monitoring

Abstract

A vehicle wheel information supply device for supplying wheel information relating to a state of a wheel of a vehicle, including a wheel state detector for detecting the state of the wheel, a wheel information generator for generating the wheel information relating to the state of the wheel, on the basis of an output of the wheel state detector, a transmitter for transmitting the wheel information, and a receiver which receives the wheel information transmitted by the transmitter, the wheel state detector, the wheel information generator and the transmitter being disposed on the wheel while the receiver being disposed on a body of said vehicle, wherein the wheel information generator is capable of selectively generating different kinds of wheel information having respective different volumes, and at least one of the wheel information generator and the transmitter operates in a manner depending upon at least one parameter indicative of the state of the wheel, which at least one parameter is detected by the wheel state detector.

Claims

1. A vehicle wheel information supply device for supplying wheel information relating to a state of a wheel of a vehicle, including a wheel state detector for detecting the state of the wheel, a wheel information generator for generating the wheel information relating to the state of the wheel, on the basis of an output of said wheel state detector, a transmitter for transmitting said wheel information, and a receiver which receives said wheel information transmitted by said transmitter, said wheel state detector, said wheel information generator and said transmitter being disposed on said wheel while said receiver being disposed on a body of said vehicle, wherein an improvement comprises:

said wheel information generator being capable of selectively generating wheel information having respective different volumes, at least one of said wheel information generator and said transmitter operating in a manner which changes depending upon at least one parameter indicative of said state of said wheel, which at least one parameter is detected by said wheel state detector.

2. A vehicle wheel information supply device according to claim 1, wherein said wheel information generator operates in a manner which changes depending upon said at least one parameter indicative of the state of said wheel detected by said wheel state detector.

3. A vehicle wheel information supply device according to claim 1, wherein said wheel information generator comprises a first wheel information generating portion for generating first wheel information having a first volume, and a second wheel information generating portion for generating second wheel information having a second volume smaller than said first volume, said first and second wheel information generating portions being activated to generate said first wheel information and said second wheel information as said wheel information, depending upon said at least one parameter indicative of said state of said wheel detected by said wheel state detector.

4. A vehicle wheel information supply device according to claim 3, wherein said second wheel information generating portion is activated when a value of each of said at least one parameter becomes larger or smaller than a predetermined threshold, said at least one parameter being selected from a plurality of parameters including a rotating speed of said wheel.

5. A vehicle wheel information supply device according to claim 3, wherein said at least one parameter includes a rotating speed of said wheel, and said second wheel information generating portion is activated when said rotating speed of the wheel becomes higher than a predetermined threshold.

6. A vehicle wheel information supply device according to claim 3, wherein said wheel information generator further comprises commanding means for activating said second wheel information generating portion when a value of each of said at least one parameter becomes larger or smaller than a predetermined threshold, said at least one parameter being selected from a plurality of parameters including a rotating speed of said wheel.

7. A vehicle wheel information supply device according to claim 3, wherein said first and second wheel information generating portions are both activated to generate said first wheel information and said second wheel information when a value of each of said at least one parameter becomes larger or smaller than a predetermined threshold, said at least one parameter being selected from a plurality of parameters including a rotating speed of said wheel, said transmitter transmitting said first and second wheel information successively to said receiver.

8. A vehicle wheel information supply device according to claim 3, wherein said second wheel information generating portion is activated when said at least one parameter detected by said wheel state detector indicates an abnormal state of said wheel, said second wheel information including abnormality data indicative of said abnormal state of said wheel and not including any wheel state quantity data indicative of the state of the wheel.

9. A vehicle wheel information supply device according to claim 1, wherein said wheel information include at least one kind of information each of which includes primary information indicative of the state of said wheel, and ancillary information, said primary information and said ancillary information being transmitted by said transmitter as a unit of information.

10. A vehicle wheel information supply device according to claim 9, wherein said ancillary information include header/trailer information indicative of at least one of opposite ends of said unit of information.

11. A vehicle wheel information supply device according to claim 1, wherein at least one of said wheel information generator and said transmitter operates in one of a plurality of different modes which is selected depending upon a rotating speed of said wheel which is detected by said wheel state detector.

12. A vehicle wheel information supply device according to claim 1, wherein said wheel information generator comprises normal-frequency wheel information generating portion for generating the wheel information at a predetermined first frequency, and a high-frequency wheel information generating portion for generating the wheel information at a predetermined second frequency higher than said first frequency, said first and second wheel information generating portions being activated to generate said first wheel information and said second wheel information as said wheel information, depending upon said at least one parameter indicative of said state of said wheel detected by said wheel state detector.

13. A vehicle wheel information supply device according to claim 1, wherein said transmitter operates in a manner which changes depending upon said at least one parameter indicative of the state of said wheel detected by said wheel state detector.

14. A vehicle wheel information supply device according to claim 1, wherein said transmitter comprises transmission controlling means for controlling the number of times of transmission of said wheel information such that said number of times of transmission is larger when a value of each of said at least one parameter indicative of the state of said wheel detected by said wheel state detector is larger or smaller than a predetermined threshold, than when said value is not larger or smaller than said predetermined threshold, said at least one parameter being selected from a plurality of parameters including a rotating speed of said wheel.

17. A vehicle wheel information supply device according to claim 3, wherein said wheel state detector includes an air pressure detector for detecting an air pressure in a tire of said wheel, and said wheel information includes air pressure data relating to the air pressure detected by said air pressure detector.

18. A vehicle wheel information supply device according to claim 17, wherein said second wheel information generating portion is activated to generate said second wheel information when a rate of reduction of said air pressure detected by said air pressure detector is higher than a predetermined threshold.

19. A vehicle wheel information supply device according to claim 17, wherein said second wheel information generating portion is activated to generate said second wheel information when said air pressure detected by said air pressure detector is lower than a preset value.

20. A vehicle wheel information supply device according to claim 17, wherein said second wheel information generating portion is activated to generate said second wheel information when a state of reduction of said air pressure detected by said air pressure detector is abnormal and an operator of the vehicle must be informed of this abnormal state of reduction of the air pressure, said second wheel information including tire pressure abnormality data indicative of said abnormal state of reduction of the air pressure and not including any data indicative of said air pressure detected by said air pressure detector.

21. A vehicle wheel information supply device according to claim 17, wherein said first wheel information generating portion and said second wheel information generating portion are activated to generate said first wheel information and said second wheel information, respectively, when a state of reduction of said air pressure detected by said air pressure detector is abnormal and an operator of the vehicle must be informed of this abnormal state of reduction of the air pressure, said first wheel information including both data indicative of said air pressure detected by said air pressure detector and tire air pressure abnormality data indicative of said abnormal state of reduction of the air pressure, said second wheel information including said tire air pressure abnormality data indicative of said abnormal state of reduction of the air pressure and not including data indicative of said air pressure, said transmitter transmitting to said receiver said first wheel information and said second wheel information successively.

22. A vehicle wheel information supply device according to claim 17, wherein said wheel state detector further includes a tire temperature detector for detecting a temperature of a tire of said wheel, and said first wheel information is a unit of information consisting of (a) primary information including said air pressure data and tire temperature data indicative of the temperature of said tire, and (b) ancillary information, while said second wheel information is a unit of information consisting of (c) primary information including said air pressure data and not including said tire temperature data and (d) ancillary information.

23. A vehicle wheel information supply device according to claim 17, wherein said wheel information generator includes high-frequency wheel information generating portion for generating the wheel information at a higher frequency when a value of each of at least one parameter relating to said air pressure of the tire of said wheel detected by said air pressure detector is larger or smaller than a predetermined threshold, than when said value is not larger or smaller than said predetermined threshold.

24. A vehicle wheel information supply device according to claim 17, wherein said transmitter operates in a manner which changes depending upon at least one of said air pressure of the tire of said wheel and a rotating speed of said wheel.

25. A vehicle wheel information supply device according to claim 17, wherein said transmitter comprises transmission controlling means for controlling the number of times of transmission of said wheel information such that said number of times of transmission is larger when a value of each of at least one parameter relating to said air pressure of the tire of said wheel is larger or smaller than a predetermined threshold, than when said value of each of said at least one parameter relating to said air pressure is not larger or smaller than said predetermined threshold.

27. A vehicle wheel information supply device according to claim 1, wherein said receiver includes a controller for changing a mode of operation of said receiver from a reception standby mode to a registration mode when said receiver receives a registration mode signal received from said transmitter, said receiver normally processing said wheel information received from said transmitter when said receiver is placed in said reception standby mode, and registering identification data received from said transmitter when said receiver is placed in said registration mode, said wheel information including said identification data which identify said transmitter.

28. A vehicle wheel information supply device according to claim 27, wherein said transmitter transmits said registration mode signal to said receiver while said receiver is incapable of receiving information from a transmitter provided on a wheel of another vehicle and when the vehicle wheel information supply device is placed in a predetermined state.

29. A vehicle wheel information supply device according to claim 28, wherein said transmitter transmits said identification data following said registration mode signal, so that said identification data are registered in said receiver immediately after said registration mode is established by said controller according to said registration mode signal.

31. A vehicle wheel state indicator comprising:

a vehicle wheel information supply device according to claim 1; and

an information output device informing an operator of the vehicle, of the state of said wheel, on the basis of said wheel information received by said receiver of said vehicle wheel information supply device.

32. A vehicle wheel tire abnormality indicating device comprising:

a vehicle wheel information supply device according to claim 17; and

an indicating device informing an operator of the vehicle that the air pressure in the tire is abnormal, when said receiver receives said second wheel information which include tire abnormality data indicating that a state of reduction of said air pressure detected by said air pressure detector or temperature detected by said temperature detector is abnormal.

15. A vehicle wheel information supply device for supplying wheel information relating to a state of a wheel of a vehicle, including a wheel state detector for detecting the state of the wheel, a wheel information generator for generating the wheel information relating to the state of the wheel, on the basis of an output of said wheel state detector, a transmitter for transmitting said wheel information, and a receiver which receives said wheel information transmitted by said transmitter, said wheel state detector, said wheel information generator and said transmitter being disposed on said wheel while said receiver being disposed on a body of said vehicle, wherein an improvement comprises:

said wheel information generator being capable of generating wheel information having respective different volumes; and

said wheel information generator including a wheel information supply control device for controlling at least one of an operation of said wheel information generator and an operation of said transmitter, for thereby controlling a condition in which said wheel information is supplied, depending upon at least one parameter indicative of said state of said wheel, which at least one parameter is detected by said wheel state detector.

16. A vehicle wheel information supply device for supplying wheel information relating to a state of a wheel of a vehicle, including a wheel state detector for detecting the state of the wheel, a wheel information generator for generating the wheel information relating to the state of the wheel, on the basis of an output of said wheel state detector, a transmitter for transmitting said wheel information, and a receiver which receives said wheel information transmitted by said transmitter, said wheel state detector, said wheel information generator and said transmitter being disposed on said wheel while said receiver being disposed on a body of said vehicle, wherein an improvement comprises:

said wheel information generator including an information volume changing device for changing a volume of said wheel information depending upon at least one parameter indicative of the state of said wheel, which at least one parameter is detected by said wheel state detector.

26. A vehicle wheel information supply device for supplying wheel information relating to a state of a wheel of a vehicle, including an air pressure detector for an air pressure in a tire of said wheel, an air pressure information generator for generating air pressure information relating to the air pressure of the wheel, on the basis of an output of said air pressure detector, a transmitter for transmitting said air pressure information, and a receiver which receives said air pressure information transmitted by said transmitter, said air pressure detector, said air pressure information generator and said transmitter being disposed on said wheel while said receiver being disposed on a body of said vehicle, wherein said air pressure information generator includes an information volume changing device for changing a volume of said air pressure information depending upon at least one parameter relating to the air pressure of said wheel, which at least one parameter is detected by said air pressure detector.

30. A vehicle wheel information supply device for supplying wheel information relating to a state of a wheel of a vehicle, including a wheel state detector for detecting the state of the wheel, a wheel information generator for generating the wheel information relating to the state of the wheel, on the basis of an output of said wheel state detector, a transmitter for transmitting said wheel information, and a receiver which receives said wheel information transmitted by said transmitter, said wheel state detector, said wheel information generator and said transmitter being disposed on said wheel while said receiver being disposed on a body of said vehicle, said vehicle wheel information supply device being characterised in that:

said wheel information generator comprises a first wheel information generating portion for generating first wheel information having a first volume, and a second wheel information generating portion for generating second wheel information having a second volume smaller than said first volume, at least one of said first and second wheel information generating portions being activated to generate at least one of said first wheel information and said second wheel information, depending upon at least one parameter indicative of said state of said wheel, which at least one parameter is detected by said wheel state detector.