CA2515910A1 - Sensor system for tire - Google Patents
Sensor system for tire Download PDFInfo
- Publication number
- CA2515910A1 CA2515910A1 CA002515910A CA2515910A CA2515910A1 CA 2515910 A1 CA2515910 A1 CA 2515910A1 CA 002515910 A CA002515910 A CA 002515910A CA 2515910 A CA2515910 A CA 2515910A CA 2515910 A1 CA2515910 A1 CA 2515910A1
- Authority
- CA
- Canada
- Prior art keywords
- sensor unit
- tire
- sensor
- installation position
- air chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000009434 installation Methods 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
A sensor system for a tire, and the system enables the installation condition of a sensor unit in a tire~s air chamber to be known. A sensor system where a sensor unit is installed in a tire~s air chamber has detecting means for detecting a relative change in the distance between the sensor unit and a position where the sensor unit is installed.
Description
SENSOR SYSTEM FOR TIRE
TECHNICAL FIELD
The present invention relates to a sensor system for a tire, which detects information inside the tire such as an air pressure and a temperature, and more particularly relates to a sensor system for a tire which enables an installation condition of a sensor unit in a tire's air chamber to be known.
BACKGROUND ART
In order to monitor information inside a tire, such as an air pressure and a temperature, there has been heretofore performed attachment of a sensor unit to an inner surface of the tire, a well part of a rim or the like, detection of the information inside the tire by use of the sensor unit, and transmission of the detection results to a receiver outside the tire by utilizing radio waves (for example, see Japanese patent application I~ohyopublication No. Hei 10(1998)-504783).
In such a sensor system for a tire, a sensor unit is installed in a tire's air chamber. Thus, there is a drawback that, even if the sensor unit falls off a predetermined installation position in assembly of a rim, the falling of the sensor unit cannot be known. If a vehicle runs while the sensor unit has fallen off, an electronic component of the sensor unit will be destroyed, and communication may be disabled or a false alarm may be given.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a sensor system for a tire which enables an installation condition of a sensor unit in a tire's air chamber to be known.
A sensor system for a tire of the present invention to achieve the foregoing object is a sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, including detecting means for detecting a relative change in a distance between the sensor unit and a position where the sensor unit should be installed.
As described above, by providing the detecting means for detecting the relative change in the distance between the sensor unit and the position where the sensor unit should be installed, if the sensor unit falls off a predetermined installation position in assembly of a rim, the falling of the sensor unit can be easily known. Therefore, destruction of an electronic component, disabled communication, a false alarm, and the like attributable to the falling of the sensor unit can be prevented.
In the present invention, in order to detect the relative change in the distance between the sensor unit and its installation position, the following structure can be adopted.
Specifically, a sensor system for a tire of the present invention is a sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, including: a base which fixes the sensor unit in its installation position, the base being attached to the sensor unit a conductive path with a pair of contact points formed in the base, the conductive path connecting the contact points thereof and a detection circuit with a pair of contact points formed in the sensor unit, the detection circuit connecting the contact points thereof, and the contact points being arranged corresponding to positions of the contact points in the base. In the system, a relative change in a distance between the sensor unit and its installation position is detected based on an open and closed state of the detection circuit.
TECHNICAL FIELD
The present invention relates to a sensor system for a tire, which detects information inside the tire such as an air pressure and a temperature, and more particularly relates to a sensor system for a tire which enables an installation condition of a sensor unit in a tire's air chamber to be known.
BACKGROUND ART
In order to monitor information inside a tire, such as an air pressure and a temperature, there has been heretofore performed attachment of a sensor unit to an inner surface of the tire, a well part of a rim or the like, detection of the information inside the tire by use of the sensor unit, and transmission of the detection results to a receiver outside the tire by utilizing radio waves (for example, see Japanese patent application I~ohyopublication No. Hei 10(1998)-504783).
In such a sensor system for a tire, a sensor unit is installed in a tire's air chamber. Thus, there is a drawback that, even if the sensor unit falls off a predetermined installation position in assembly of a rim, the falling of the sensor unit cannot be known. If a vehicle runs while the sensor unit has fallen off, an electronic component of the sensor unit will be destroyed, and communication may be disabled or a false alarm may be given.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a sensor system for a tire which enables an installation condition of a sensor unit in a tire's air chamber to be known.
A sensor system for a tire of the present invention to achieve the foregoing object is a sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, including detecting means for detecting a relative change in a distance between the sensor unit and a position where the sensor unit should be installed.
As described above, by providing the detecting means for detecting the relative change in the distance between the sensor unit and the position where the sensor unit should be installed, if the sensor unit falls off a predetermined installation position in assembly of a rim, the falling of the sensor unit can be easily known. Therefore, destruction of an electronic component, disabled communication, a false alarm, and the like attributable to the falling of the sensor unit can be prevented.
In the present invention, in order to detect the relative change in the distance between the sensor unit and its installation position, the following structure can be adopted.
Specifically, a sensor system for a tire of the present invention is a sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, including: a base which fixes the sensor unit in its installation position, the base being attached to the sensor unit a conductive path with a pair of contact points formed in the base, the conductive path connecting the contact points thereof and a detection circuit with a pair of contact points formed in the sensor unit, the detection circuit connecting the contact points thereof, and the contact points being arranged corresponding to positions of the contact points in the base. In the system, a relative change in a distance between the sensor unit and its installation position is detected based on an open and closed state of the detection circuit.
Moreover, a sensor system for a tire of the present invention is a sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, including a proximity sensor which reacts to metal, the proximity sensor being arranged in the sensor unit. In the system, a relative change in a distance between the sensor unit and its installation position is detected based on an output of the proximity sensor.
Furthermore, a sensor system for a tire of the present invention is a sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, including, a probing member which is elastically energized toward an installation position of the sensor unit, the probing member being arranged in the sensor unit. In the system, a relative change in a distance between the sensor unit and its installation position is detected based on displacement of the probing member.
Furthermore, a sensor system for a tire of the present invention is a sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, including a passive transponder mounted in the sensor unit. In the system, a relative change in a distance between the sensor unit and its installation position is detected based on a response of the passive transponder to a reader having a limited output.
In the present invention, the sensor unit includes an electronic component required to detect information inside the tire, the component being housed in a case. The electronic component which constitutes the sensor unit, and structure of the case, are not particularly limited.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a cross-sectional view schematically showing a sensor system for a tire according to a first embodiment of the present invention.
Fig. 2 is a cross-sectional view schematically showing a sensor system for a tire according to a second embodiment of the present invention.
Fig. 3 is a cross-sectional view schematically showing a sensor system for a tire according to a third embodiment of the present invention.
Fig. 4 is a cross-sectional view schematically showing a sensor system for a tire according to a fourth embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to the accompanying drawings, a configuration of the present invention will be described in detail below.
Fig. 1 shows a sensor system for a tire according to a first embodiment of the present invention. In Fig. 1, R denotes a rim, T denotes a tire, and S denotes a tire's air chamber. The sensor system for a tire of this embodiment includes a sensor unit 1 for detecting information inside the tire, and a base 11 for fixing the sensor unit 1. The sensor unit 1 is installed in the tire's air chamber by means of the base 11.
The sensor unit 1 includes an electronic component in a case, measures an air pressure of the tire and an internal temperature thereof, and transmits the measurement results to the outside of the tire. The base I1 includes at least a pair of locking parts 13 and 13 which are protruded from a bottom part 12. These locking parts 13 and 13 lock the sensor unit 1 by sandwiching the unit. The bottom part 12 of the base 11 is fixed to an outer peripheral surface of the rim R, for example. Specifically, the sensor unit 1 is attachable to and detachable from the base 11 fixed to the outer peripheral surface of the rim R.
Furthermore, a sensor system for a tire of the present invention is a sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, including, a probing member which is elastically energized toward an installation position of the sensor unit, the probing member being arranged in the sensor unit. In the system, a relative change in a distance between the sensor unit and its installation position is detected based on displacement of the probing member.
Furthermore, a sensor system for a tire of the present invention is a sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, including a passive transponder mounted in the sensor unit. In the system, a relative change in a distance between the sensor unit and its installation position is detected based on a response of the passive transponder to a reader having a limited output.
In the present invention, the sensor unit includes an electronic component required to detect information inside the tire, the component being housed in a case. The electronic component which constitutes the sensor unit, and structure of the case, are not particularly limited.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a cross-sectional view schematically showing a sensor system for a tire according to a first embodiment of the present invention.
Fig. 2 is a cross-sectional view schematically showing a sensor system for a tire according to a second embodiment of the present invention.
Fig. 3 is a cross-sectional view schematically showing a sensor system for a tire according to a third embodiment of the present invention.
Fig. 4 is a cross-sectional view schematically showing a sensor system for a tire according to a fourth embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to the accompanying drawings, a configuration of the present invention will be described in detail below.
Fig. 1 shows a sensor system for a tire according to a first embodiment of the present invention. In Fig. 1, R denotes a rim, T denotes a tire, and S denotes a tire's air chamber. The sensor system for a tire of this embodiment includes a sensor unit 1 for detecting information inside the tire, and a base 11 for fixing the sensor unit 1. The sensor unit 1 is installed in the tire's air chamber by means of the base 11.
The sensor unit 1 includes an electronic component in a case, measures an air pressure of the tire and an internal temperature thereof, and transmits the measurement results to the outside of the tire. The base I1 includes at least a pair of locking parts 13 and 13 which are protruded from a bottom part 12. These locking parts 13 and 13 lock the sensor unit 1 by sandwiching the unit. The bottom part 12 of the base 11 is fixed to an outer peripheral surface of the rim R, for example. Specifically, the sensor unit 1 is attachable to and detachable from the base 11 fixed to the outer peripheral surface of the rim R.
In the above-described sensor system for a tire, a pair of contact points 14 and 14 are provided at portions of the base 11 where the base comes into contact with the sensor unit 1. Moreover, in the base 11, a conductive path 15 is formed, which electrically connects the pair of contact points 14 and 14 to each other. Meanwhile, a pair of contact points 2 and 2 are provided at portions of the sensor unit 1 where the unit comes into contact with the base 11. Moreover, in the sensor unit 1, a detection circuit 3 is formed, which electrically connects the pair of contact points 2 and 2 to each other. This detection circuit 3 is formed in the electronic component of the sensor unit 1.
In the thus configured sensor system for a tire, when the sensor unit 1 is attached to the base 11, the detection circuit 3 is set in a closed state.
On the other hand, if the sensor unit 1 becomes detached from the base 11 or moves out from a predetermined locking position on the base 11 in assembly of the rim and the like, the detection circuit 3 is set in an open state.
Therefore, based on the open or closed state of the detection circuit 3, a relative change in a distance between the sensor unit 1 and a position where the sensor unit should be installed is detected. Thus, an installation condition of the sensor unit 1 can be known.
Fig. 2 shows a sensor system for a tire according to a second embodiment of the present invention. In Fig. 2, R denotes a rim, T denotes a tire, and S denotes a tire's air chamber. The sensor system for a tire of this embodiment includes a sensor unit 21 for detecting information inside the tire. The sensor unit 21 is installed in the tire's air chamber. The sensor unit 21 includes an electronic component in a case, measures an air pressure of the tire and an internal temperature thereof, and transmits the measurement results to the outside of the tire.
In the above-described sensor system for a tire, an eddy-current type proximity sensor 22 which reacts to metal is provided in the sensor unit 21.
This proximity sensor 22 is disposed so as to face a position where the sensor unit 21 is installed, and generates an output according to a mass of and a distance from a metal member existing in the position. For example, if the sensor unit 21 is attached to an outer peripheral surface of the rim R, the proximity sensor 22 can be configured as described below. Sensitivity of the proximity sensor 22 is controlled so as to react to the rim R made of metal, and, when the proximity sensor 22 comes off the rim R, the sensor no longer reacts to the rim. Moreover, if the sensor unit 21 is attached to an inner surface of the tire, the proximity sensor 22 can be also configured as described below. The sensitivity of the proximity sensor 22 is controlled so as to react to a steel wire embedded inside the tire, and, when the proximity sensor 22 comes off the tire, the sensor no longer reacts to the steel wire.
In other words, the proximity sensor 22 is used as a switch. Alternatively, an output of the proximity sensor 22 when the sensor unit 21 is installed in a normal position is stored, and a relative change in a distance between the sensor unit 21 and its installation position may be detected based on a change in the output.
In the thus configured sensor system for a tire, when the sensor unit 21 is installed in a predetermined position, the proximity sensor 22 generates a predetermined output. Meanwhile, if the sensor unit 21 becomes detached from its installation position in assembly of the rim and the like, the output of the proximity sensor 22 changes. Therefore, the relative change in the distance between the sensor unit 21 and its installation position is detected based on the output of the proximity sensor 22. Thus, an installation condition of the sensor unit 21 can be known.
Fig. 3 shows a sensor system for a tire according to a third embodiment of the present invention. In Fig. 3, R denotes a rim, T denotes a tire, and S denotes a tire's air chamber. The sensor system for a tire of this embodiment includes a sensor unit 31 for detecting information inside the tire. The sensor unit 31 is installed in the tire's air chamber. The sensor unit 31 includes an electronic component in a case, measures an air pressure of the tire and an internal temperature thereof, and transmits the measurement results to the outside of the tire.
In the above-described sensor system for a tire, a rod-like probing member 32 which is elastically energized toward an installation position of the sensor unit 31 is provided in the sensor unit 31. Specifically, the probing member 32 can freely come out of or get back into the sensor unit 31 while being energized by an elastic body 33 such as a spring. The sensor unit 31 is installed in a state where the probing member 32 pressed against the installation position is housed in the sensor unit 3I. Moreover, in the electronic component of the sensor unit 31, a circuit which is opened or closed according to a position of the probing member 32 is provided.
In the thus configured sensor system for a tire, when the sensor unit 31 is installed in a predetermined position, the probing member 32 is set in a state of being housed in the sensor unit 31. Meanwhile, if the sensor unit 31 becomes detached from its installation position in assembly of the rim and the like, the probing member 32 comes out of the sensor unit 31, and a relative position of the probing member 32 in the sensor unit 31 is changed.
Therefore, a relative change in a distance between the sensor unit 31 and its installation position is detected based on displacement of the probing member 32. Thus, an installation condition of the sensor unit 31 can be known.
In the first to third embodiments described above, the installation condition of the sensor unit may be constantly monitored. In such a case, however, too much power is consumed. Thus, it is preferable that detecting means for detecting the relative change in the distance between the sensor unit and its installation position be operated at predetermined time intervals.
A detection result concerning the installation condition of the sensor unit may be transmitted to the outside of the tire by utilizing a transmitter that is included in the electronic component of the sensor unit. In this event, in order to transmit information that the sensor unit is displaced from a predetermined installation position, a code for the predetermined position in a communication protocol may be changed or a protocol signal different from a usual one may be transmitted.
Fig. 4 shows a sensor system for a tire according to a fourth embodiment of the present invention. In Fig. 4, R denotes a rim, T denotes a tire, and S denotes a tire's air chamber. The sensor system for a tire of this embodiment includes a sensor unit 41 for detecting information inside the tire. The sensor unit 41 is installed in the tire's air chamber. The sensor unit 41 includes an electronic component in a case, measures an air pressure of the tire and an internal temperature thereof, and transmits the measurement results to the outside of the tire.
In the above-described sensor system for a tire, the sensor unit 41 includes a passive transponder 42. This passive transponder 42 transmits a response signal in response to an inquiry signal from the outside of the tire.
The passive transponder 42 may be inserted into the case of the sensor unit 41 as an independent component or may be included in a circuit of the electronic component of the sensor unit 41.
Moreover, in the above-described sensor system for a tire, a reader (scanner) 43 for providing the inquiry signal is simultaneously used. This reader 43 has a limited output. Specifically, an output range of the reader 43 is limited within a 10-cm radius, preferably within a 5-cm radius.
Accordingly, if the passive transponder 42 is out of the output range of the reader 43, the response signal cannot be obtained for the inquiry signal.
In the thus configured sensor system for a tire, the sensor unit 41 is installed in a predetermined position on an inner surface of the tire T. For example, the sensor unit 41 is installed behind a specific character displayed on a side face of the tire on an outer side of a vehicle. Accordingly, in a state where the rim is assembled, the reader 43 is brought close to a position where the sensor unit 41 should be installed from the outside of the tire.
Thus, the inquiry signal is provided. In this event, the response signal can be obtained if the sensor unit 41 is installed in the predetermined position.
The response signal cannot be obtained, however, if the sensor unit 41 does not exist in the predetermined position. Therefore, a relative change in a distance between the sensor unit 41 and its installation position is detected based on a response of the passive transponder 42 to the reader 43 having the limited output. Thus, an installation condition of the sensor unit 41 can be known.
Although the embodiments of the present invention have been described in detail above, it should be understood that various changes, alternatives, and substitutions can be made without departing from the spirit and scope of the present invention, which are defined by the attached claims.
INDUSTRIAL APPLICABILITY
The present invention can be effectively utilized in tire manufacturing industries and thus in automobile manufacturing industries.
In the thus configured sensor system for a tire, when the sensor unit 1 is attached to the base 11, the detection circuit 3 is set in a closed state.
On the other hand, if the sensor unit 1 becomes detached from the base 11 or moves out from a predetermined locking position on the base 11 in assembly of the rim and the like, the detection circuit 3 is set in an open state.
Therefore, based on the open or closed state of the detection circuit 3, a relative change in a distance between the sensor unit 1 and a position where the sensor unit should be installed is detected. Thus, an installation condition of the sensor unit 1 can be known.
Fig. 2 shows a sensor system for a tire according to a second embodiment of the present invention. In Fig. 2, R denotes a rim, T denotes a tire, and S denotes a tire's air chamber. The sensor system for a tire of this embodiment includes a sensor unit 21 for detecting information inside the tire. The sensor unit 21 is installed in the tire's air chamber. The sensor unit 21 includes an electronic component in a case, measures an air pressure of the tire and an internal temperature thereof, and transmits the measurement results to the outside of the tire.
In the above-described sensor system for a tire, an eddy-current type proximity sensor 22 which reacts to metal is provided in the sensor unit 21.
This proximity sensor 22 is disposed so as to face a position where the sensor unit 21 is installed, and generates an output according to a mass of and a distance from a metal member existing in the position. For example, if the sensor unit 21 is attached to an outer peripheral surface of the rim R, the proximity sensor 22 can be configured as described below. Sensitivity of the proximity sensor 22 is controlled so as to react to the rim R made of metal, and, when the proximity sensor 22 comes off the rim R, the sensor no longer reacts to the rim. Moreover, if the sensor unit 21 is attached to an inner surface of the tire, the proximity sensor 22 can be also configured as described below. The sensitivity of the proximity sensor 22 is controlled so as to react to a steel wire embedded inside the tire, and, when the proximity sensor 22 comes off the tire, the sensor no longer reacts to the steel wire.
In other words, the proximity sensor 22 is used as a switch. Alternatively, an output of the proximity sensor 22 when the sensor unit 21 is installed in a normal position is stored, and a relative change in a distance between the sensor unit 21 and its installation position may be detected based on a change in the output.
In the thus configured sensor system for a tire, when the sensor unit 21 is installed in a predetermined position, the proximity sensor 22 generates a predetermined output. Meanwhile, if the sensor unit 21 becomes detached from its installation position in assembly of the rim and the like, the output of the proximity sensor 22 changes. Therefore, the relative change in the distance between the sensor unit 21 and its installation position is detected based on the output of the proximity sensor 22. Thus, an installation condition of the sensor unit 21 can be known.
Fig. 3 shows a sensor system for a tire according to a third embodiment of the present invention. In Fig. 3, R denotes a rim, T denotes a tire, and S denotes a tire's air chamber. The sensor system for a tire of this embodiment includes a sensor unit 31 for detecting information inside the tire. The sensor unit 31 is installed in the tire's air chamber. The sensor unit 31 includes an electronic component in a case, measures an air pressure of the tire and an internal temperature thereof, and transmits the measurement results to the outside of the tire.
In the above-described sensor system for a tire, a rod-like probing member 32 which is elastically energized toward an installation position of the sensor unit 31 is provided in the sensor unit 31. Specifically, the probing member 32 can freely come out of or get back into the sensor unit 31 while being energized by an elastic body 33 such as a spring. The sensor unit 31 is installed in a state where the probing member 32 pressed against the installation position is housed in the sensor unit 3I. Moreover, in the electronic component of the sensor unit 31, a circuit which is opened or closed according to a position of the probing member 32 is provided.
In the thus configured sensor system for a tire, when the sensor unit 31 is installed in a predetermined position, the probing member 32 is set in a state of being housed in the sensor unit 31. Meanwhile, if the sensor unit 31 becomes detached from its installation position in assembly of the rim and the like, the probing member 32 comes out of the sensor unit 31, and a relative position of the probing member 32 in the sensor unit 31 is changed.
Therefore, a relative change in a distance between the sensor unit 31 and its installation position is detected based on displacement of the probing member 32. Thus, an installation condition of the sensor unit 31 can be known.
In the first to third embodiments described above, the installation condition of the sensor unit may be constantly monitored. In such a case, however, too much power is consumed. Thus, it is preferable that detecting means for detecting the relative change in the distance between the sensor unit and its installation position be operated at predetermined time intervals.
A detection result concerning the installation condition of the sensor unit may be transmitted to the outside of the tire by utilizing a transmitter that is included in the electronic component of the sensor unit. In this event, in order to transmit information that the sensor unit is displaced from a predetermined installation position, a code for the predetermined position in a communication protocol may be changed or a protocol signal different from a usual one may be transmitted.
Fig. 4 shows a sensor system for a tire according to a fourth embodiment of the present invention. In Fig. 4, R denotes a rim, T denotes a tire, and S denotes a tire's air chamber. The sensor system for a tire of this embodiment includes a sensor unit 41 for detecting information inside the tire. The sensor unit 41 is installed in the tire's air chamber. The sensor unit 41 includes an electronic component in a case, measures an air pressure of the tire and an internal temperature thereof, and transmits the measurement results to the outside of the tire.
In the above-described sensor system for a tire, the sensor unit 41 includes a passive transponder 42. This passive transponder 42 transmits a response signal in response to an inquiry signal from the outside of the tire.
The passive transponder 42 may be inserted into the case of the sensor unit 41 as an independent component or may be included in a circuit of the electronic component of the sensor unit 41.
Moreover, in the above-described sensor system for a tire, a reader (scanner) 43 for providing the inquiry signal is simultaneously used. This reader 43 has a limited output. Specifically, an output range of the reader 43 is limited within a 10-cm radius, preferably within a 5-cm radius.
Accordingly, if the passive transponder 42 is out of the output range of the reader 43, the response signal cannot be obtained for the inquiry signal.
In the thus configured sensor system for a tire, the sensor unit 41 is installed in a predetermined position on an inner surface of the tire T. For example, the sensor unit 41 is installed behind a specific character displayed on a side face of the tire on an outer side of a vehicle. Accordingly, in a state where the rim is assembled, the reader 43 is brought close to a position where the sensor unit 41 should be installed from the outside of the tire.
Thus, the inquiry signal is provided. In this event, the response signal can be obtained if the sensor unit 41 is installed in the predetermined position.
The response signal cannot be obtained, however, if the sensor unit 41 does not exist in the predetermined position. Therefore, a relative change in a distance between the sensor unit 41 and its installation position is detected based on a response of the passive transponder 42 to the reader 43 having the limited output. Thus, an installation condition of the sensor unit 41 can be known.
Although the embodiments of the present invention have been described in detail above, it should be understood that various changes, alternatives, and substitutions can be made without departing from the spirit and scope of the present invention, which are defined by the attached claims.
INDUSTRIAL APPLICABILITY
The present invention can be effectively utilized in tire manufacturing industries and thus in automobile manufacturing industries.
Claims (5)
1. A sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, comprising:
detecting means for detecting a relative change in a distance between the sensor unit and a position where the sensor unit is installed.
detecting means for detecting a relative change in a distance between the sensor unit and a position where the sensor unit is installed.
2. A sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, comprising:
a base which fixes the sensor unit in its installation position, the base being attached to the sensor unit;
a conductive path with a pair of contact points formed in the base, the conductive path connecting the contact points thereof and a detection circuit with a pair of contact points formed in the sensor unit, the detection circuit connecting the contact points thereof, and the contact points being arranged corresponding to positions of the contact points in the base, wherein a relative change in a distance between the sensor unit and its installation position is detected based on an open and closed state of the detection circuit.
a base which fixes the sensor unit in its installation position, the base being attached to the sensor unit;
a conductive path with a pair of contact points formed in the base, the conductive path connecting the contact points thereof and a detection circuit with a pair of contact points formed in the sensor unit, the detection circuit connecting the contact points thereof, and the contact points being arranged corresponding to positions of the contact points in the base, wherein a relative change in a distance between the sensor unit and its installation position is detected based on an open and closed state of the detection circuit.
3. A sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, comprising:
a proximity sensor which reacts to metal, the proximity sensor being arranged in the sensor unit, wherein a relative change in a distance between the sensor unit and its installation position is detected based on an output of the proximity sensor.
a proximity sensor which reacts to metal, the proximity sensor being arranged in the sensor unit, wherein a relative change in a distance between the sensor unit and its installation position is detected based on an output of the proximity sensor.
4. A sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, comprising:
a probing member which is elastically energized toward an installation position of the sensor unit, the probing member being arranged in the sensor unit, wherein a relative change in a distance between the sensor unit and its installation position is detected based on displacement of the probing member.
a probing member which is elastically energized toward an installation position of the sensor unit, the probing member being arranged in the sensor unit, wherein a relative change in a distance between the sensor unit and its installation position is detected based on displacement of the probing member.
5. A sensor system for a tire, in which a sensor unit is installed in a tire's air chamber, comprising:
a passive transponder mounted in the sensor unit, wherein a relative change in a distance between the sensor unit and its installation position is detected based on a response of the passive transponder to a reader having a limited output.
a passive transponder mounted in the sensor unit, wherein a relative change in a distance between the sensor unit and its installation position is detected based on a response of the passive transponder to a reader having a limited output.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003-094884 | 2003-03-31 | ||
| JP2003094884A JP4169623B2 (en) | 2003-03-31 | 2003-03-31 | Tire sensor system |
| PCT/JP2004/004124 WO2004087440A1 (en) | 2003-03-31 | 2004-03-24 | Sensor system for tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2515910A1 true CA2515910A1 (en) | 2004-10-14 |
Family
ID=33127414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002515910A Abandoned CA2515910A1 (en) | 2003-03-31 | 2004-03-24 | Sensor system for tire |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7370522B2 (en) |
| EP (1) | EP1609628A4 (en) |
| JP (1) | JP4169623B2 (en) |
| CN (1) | CN100439133C (en) |
| CA (1) | CA2515910A1 (en) |
| WO (1) | WO2004087440A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006038059B4 (en) * | 2005-08-18 | 2015-04-02 | Ford Global Technologies, Llc | Automatic detection of a detached remote tire pressure sensor |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2874271B1 (en) * | 2004-08-10 | 2006-11-24 | Siemens Vdo Automotive Sas | METHOD AND DEVICE FOR DETECTING THE DESOLIDARIZATION OF A SENSOR IN RELATION TO A VEHICLE ON WHICH THE SAME IS SOUND |
| DE102005006904B4 (en) * | 2004-11-18 | 2014-10-30 | Volkswagen Ag | Tire pressure monitoring system for a vehicle |
| US20070088479A1 (en) * | 2005-10-19 | 2007-04-19 | Trw Automotive U.S. Llc | Apparatus with sensor assembly for sensing a vehicle crash condition and associated method |
| DE102007046485A1 (en) * | 2007-09-28 | 2009-04-23 | Continental Automotive Gmbh | Device for equipment condition monitoring of electrically conducting rim band, has two units for electrical contacting of two ends of rim band, and third unit is provided for supply of electrical voltage |
| WO2011025497A1 (en) * | 2009-08-31 | 2011-03-03 | Michelin Recherche Et Technique, S.A. | Method and apparatus for determining the depth of a metal feature in a rubber or elastomeric material |
| DE102011003134A1 (en) * | 2011-01-25 | 2012-07-26 | Bayerische Motoren Werke Aktiengesellschaft | Arrangement of a tire pressure sensor unit |
| DE102012216577B4 (en) * | 2012-09-17 | 2023-04-20 | Bayerische Motoren Werke Aktiengesellschaft | Storing tire information in a tire sensor |
| JP6048291B2 (en) * | 2013-04-17 | 2016-12-21 | 株式会社デンソー | Sensor device |
| JP6567471B2 (en) | 2016-06-30 | 2019-08-28 | 株式会社ブリヂストン | Acceleration sensor dropout determination method and acceleration sensor dropout determination apparatus |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4578992A (en) * | 1982-11-05 | 1986-04-01 | Philip E. Galasko | Detection of a low pressure condition of a vehicle tire |
| GB8430389D0 (en) * | 1984-12-01 | 1985-01-09 | Bamford Excavators Ltd | Earth moving machine |
| US5181975A (en) * | 1991-03-27 | 1993-01-26 | The Goodyear Tire & Rubber Company | Integrated circuit transponder with coil antenna in a pneumatic tire for use in tire identification |
| JP2715741B2 (en) | 1991-10-02 | 1998-02-18 | ダイキン工業株式会社 | Air conditioner |
| JP2536354B2 (en) | 1991-10-11 | 1996-09-18 | ダイキン工業株式会社 | Refrigerator protection device |
| US5287626A (en) * | 1992-11-16 | 1994-02-22 | Reich Dennis A | Apparatus and method for measuring rotation angle |
| KR970705481A (en) | 1994-08-31 | 1997-10-09 | 프리스 존 윌리엄 조지 | A TYPE CONDITION MONITORING SYSTEM |
| US5620286A (en) * | 1994-11-09 | 1997-04-15 | Rank Taylor Hobson, Ltd. | Flycutting machine for manufacturing printed circuit boards |
| EP0954773B1 (en) * | 1997-01-22 | 2002-09-04 | Siemens Aktiengesellschaft | Method and device for docking an autonomous mobile unit |
| JP3161349B2 (en) | 1997-02-05 | 2001-04-25 | 株式会社豊田自動織機製作所 | Body swing control device for industrial vehicles |
| JP3869909B2 (en) * | 1997-05-20 | 2007-01-17 | 横浜ゴム株式会社 | Pneumatic tire internal pressure detection device |
| US6448977B1 (en) * | 1997-11-14 | 2002-09-10 | Immersion Corporation | Textures and other spatial sensations for a relative haptic interface device |
| US6269688B1 (en) * | 1997-12-04 | 2001-08-07 | Intercomp Company | Apparatus and method for testing tires |
| GB2370640A (en) * | 2000-08-08 | 2002-07-03 | Transense Technologies Plc | SAW device with integral patch antenna |
| US6420967B1 (en) * | 2001-01-31 | 2002-07-16 | Lear Corporation | System and method for shared vehicle tire pressure monitoring, remote keyless entry, and vehicle immobilization |
| DE10137591B4 (en) * | 2001-08-01 | 2005-07-14 | Daimlerchrysler Ag | Telemetric tire pressure monitoring system |
| US6931920B2 (en) * | 2003-07-16 | 2005-08-23 | Lear Corporation | Tire monitoring system |
-
2003
- 2003-03-31 JP JP2003094884A patent/JP4169623B2/en not_active Expired - Fee Related
-
2004
- 2004-03-24 CN CNB2004800076414A patent/CN100439133C/en not_active Expired - Fee Related
- 2004-03-24 US US10/546,811 patent/US7370522B2/en not_active Expired - Fee Related
- 2004-03-24 WO PCT/JP2004/004124 patent/WO2004087440A1/en active Application Filing
- 2004-03-24 CA CA002515910A patent/CA2515910A1/en not_active Abandoned
- 2004-03-24 EP EP04723079A patent/EP1609628A4/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006038059B4 (en) * | 2005-08-18 | 2015-04-02 | Ford Global Technologies, Llc | Automatic detection of a detached remote tire pressure sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1761583A (en) | 2006-04-19 |
| US7370522B2 (en) | 2008-05-13 |
| JP4169623B2 (en) | 2008-10-22 |
| CN100439133C (en) | 2008-12-03 |
| EP1609628A4 (en) | 2006-04-12 |
| JP2004299536A (en) | 2004-10-28 |
| US20060196257A1 (en) | 2006-09-07 |
| EP1609628A1 (en) | 2005-12-28 |
| WO2004087440A1 (en) | 2004-10-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP7092486B2 (en) | Wheel fastener alarm | |
| AU673516B2 (en) | Remote tire pressure monitoring system employing coded tire identification and radio frequency transmission, and enabling recalibration upon tire rotation or replacement | |
| JP3381194B2 (en) | Transponder and sensor device for detecting and transmitting vehicle tire parameter data | |
| US5731516A (en) | System and method for monitoring a pneumatic tire | |
| KR100462122B1 (en) | Tire condition monitoring apparatus | |
| US5600301A (en) | Remote tire pressure monitoring system employing coded tire identification and radio frequency transmission, and enabling recalibration upon tire rotation or replacement | |
| US5838229A (en) | Remote tire pressure monitoring system employing coded tire identification and radio frequency transmission and enabling recalibration upon tire rotation or replacement | |
| US7370522B2 (en) | Sensor system for tire | |
| US5540092A (en) | System and method for monitoring a pneumatic tire | |
| KR101109205B1 (en) | A seal | |
| US20070262853A1 (en) | Vehicle alarm | |
| WO2012042515A4 (en) | Status detector and communication unit and system for remote tracking of padlocks | |
| EP1398736B1 (en) | Device and method for monitoring the tire pressure | |
| US6693520B2 (en) | Safety back-up sensor for a vehicle | |
| JP3936612B2 (en) | Magnet sensor, magnet sensor system, alarm system and home security system | |
| JP2004189034A (en) | Transponder of tire status monitoring device | |
| US20210039588A1 (en) | Wheel fastener alarm | |
| US20030112136A1 (en) | Tire pressure warning device | |
| EP4155489A1 (en) | Detection device and detection system for activating at least on function of an apparatus, and apparatus comprising the detection system | |
| KR20230130611A (en) | wheel fastener alarm | |
| JP2005331361A (en) | Tyre air pressure alarming sensor | |
| JPH05107138A (en) | Tire pressure warning device | |
| KR20000002755U (en) | Vehicle security devices | |
| KR19990043084A (en) | How to locate your vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |