JP2000346735A - System for detecting pressure in tire - Google Patents

System for detecting pressure in tire

Info

Publication number
JP2000346735A
JP2000346735A JP11159697A JP15969799A JP2000346735A JP 2000346735 A JP2000346735 A JP 2000346735A JP 11159697 A JP11159697 A JP 11159697A JP 15969799 A JP15969799 A JP 15969799A JP 2000346735 A JP2000346735 A JP 2000346735A
Authority
JP
Japan
Prior art keywords
voltage
tire
device
pressure
output
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.)
Withdrawn
Application number
JP11159697A
Other languages
Japanese (ja)
Inventor
Toshio Ikuta
敏雄 生田
Original Assignee
Denso Corp
株式会社デンソー
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Denso Corp, 株式会社デンソー filed Critical Denso Corp
Priority to JP11159697A priority Critical patent/JP2000346735A/en
Publication of JP2000346735A publication Critical patent/JP2000346735A/en
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a system for detecting pressure in a tire where operable time has been extended without making complex a battery and increasing its size. SOLUTION: A permanent magnet 10 is arranged on the inner wall of the tire house of the body of an automobile, and a generation circuit 20 is arranged in a tire. The generation circuit 20 is provided with an electromagnetic coil 21 for generating an AC voltage according to electromagnetic induction due to the line of magnetic force from the permanent magnet 10 when the tire is rotated, thus rectifying the AC voltage for smoothing and outputting as a generation voltage VS. A voltage regulator 50 receives the generation voltage VS via a relay RL3, and outputs a regulation voltage to a tire state-detecting device 70. Then, the tire state-detecting device 70 operates based on a regulator voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-tire pressure detecting system for detecting a pressure in a tire.

[0002]

2. Description of the Related Art In recent years, tires for automobiles are not flattened even if the pressure in the tires becomes zero by increasing the rigidity of the side walls (sidewalls) of the tires, and the tires have a long distance (for example, 80 km / h). There is a demand for the use of run flat tires that can run for about 80 km.

[0003] If the run-flat tire is used, the above-mentioned long-distance running is possible. Therefore, it is not necessary to use a spare tire, and space and energy can be saved. When a tire punctures, its discovery can be delayed.

On the other hand, when a tire punctures,
There is a system for notifying a driver that a tire has been punctured. In this system, a pressure sensor device that is disposed in the tire and directly measures the pressure in the tire, and notifies the driver of a "puncture of the tire" by an alarm lamp based on pressure data detected by the pressure sensor device. Alarm device.

In this device, transmission of pressure data from the pressure sensor device to the alarm device cannot be performed by wire because the tire itself rotates, but is performed by radio waves. Also, in the power supply of the pressure sensor device, similarly to the transmission of the pressure data described above, since the tire itself rotates, it cannot be performed by wire from the vehicle body, and a battery is arranged in the pressure sensor device itself.

[0006]

However, run-flat tires are used for a long period of time (10 or 12 years).
It is necessary to match the run flat tire, and it is necessary to make the storage capacity of the battery of the pressure sensor device correspond to the use period of the run flat tire.

Here, the battery itself has been improved in energy density due to recent improvements in materials and the like, and although its outer shape has been reduced in size, it has been necessary to maintain the pressure sensor device in accordance with the service period of the run flat tire. However, there is a problem that it is necessary to increase the number of batteries and the size of the batteries.

In view of the foregoing, the present invention provides a tire pressure detection system that can extend the operable time without increasing the number of batteries and increasing the size of the batteries.

[0009]

According to the present invention, in order to achieve the above object, according to the first to fourth aspects of the present invention, the pressure detecting device (70) is disposed in a tire of a moving body. The pressure in the tire is detected, a detection signal is output, and the transmission device (8
0) transmits the pressure state in the tire to the occupant of the moving object based on the detection signal output from the pressure detection device.

A magnetic field generating device (10) is provided on the main body of the moving body to generate magnetic field lines, and a voltage generating circuit (20) is provided in the tire, and the voltage generating circuit (20) is provided when the tire rotates. An electromagnetic coil (21) for generating an AC voltage in response to electromagnetic induction by magnetic lines of force from a magnetic field line generator outputs a voltage corresponding to the AC voltage, and a voltage output device (RL3, 50) The output voltage is output to the pressure detection device.

As described above, since the voltage generating circuit is disposed in the tire and the pressure detecting device operates in accordance with the voltage output from the voltage generating circuit, the number of batteries is increased without increasing the size of the batteries. The operable time of the tire pressure detection system can be extended.

Further, a power storage device (40) for storing electric power based on the voltage output from the voltage generation circuit may be employed as in the second aspect of the present invention.

Thus, when the power stored in the power storage device is supplied to the pressure detecting device when the tire is not rotating, the in-tire pressure detecting system can be operated even when the vehicle is stopped.

Further, as in the invention according to claim 3,
The voltage output device may output the voltage output from the voltage generation circuit to both the power storage device and the pressure detection device when the voltage output from the voltage generation circuit is higher than the threshold voltage.

Further, as in the invention according to claim 4, a booster circuit (31) for boosting the voltage output from the voltage generation circuit and outputting the boosted voltage to the power storage device may be provided.

With this configuration, when the voltage output from the voltage generation circuit is lower than the storage voltage of the power storage device, if the voltage from the voltage generation circuit is boosted by the booster circuit to a voltage higher than the storage voltage, the voltage generation circuit Since the power can be stored in the power storage device based on the voltage from the power supply, the power can be efficiently stored in the power storage device based on the voltage from the voltage generation circuit.

The reference numerals in parentheses of the above means are examples showing the correspondence with specific means described in the embodiments described later.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIGS. 1 and 2 show an example of the system for detecting the pressure in a tire of an automobile according to the present invention. FIG. 1 shows a state in which the tire pressure detection system is mounted on an automobile. FIG. 2 is a block diagram showing an electric circuit configuration of the tire pressure detection system.

As shown in FIG. 1, the tire pressure detection system has a pressure sensor device A and a permanent magnet 10.
The pressure sensor device A is located in the tire T and is arranged on the circumferential wall surface W of the tire hole H of the automobile. Further, the permanent magnet 10 is disposed on the inner wall of the tire house Y of the automobile, and faces the circumferential outer periphery of the tire T.

As shown in FIG. 2, the pressure sensor device includes a power generation circuit 20, a charging circuit 30, a secondary battery 40, a voltage regulator 50, an electromotive force detection circuit 60, and a tire condition detection device 70.

The power generation circuit 20 has an electromagnetic coil 21, rectifier diodes 22a and 22b, and a smoothing capacitor 23.
An AC voltage is generated by the electromagnetic induction. The neutral point of the electromagnetic coil is connected to the ground.

The rectifier diodes 22a and 22b rectify the AC voltage generated in the electromagnetic coil 21 to generate a rectified voltage. The smoothing capacitor 23 includes the rectifier diodes 22a and 22b.
The rectified voltage from 2b is smoothed. Hereinafter, the smoothed voltage smoothed by the smoothing capacitor 23 is referred to as a generated voltage VS.

The charging circuit 30 is composed of a relay RL1 and a boosting circuit 31. The boosting circuit 31 is a charge pump circuit, and generates a voltage VS from the power generating circuit 20 by using a positive terminal voltage (hereinafter referred to as a voltage) of the secondary battery 40. , Storage voltage VD)
The voltage is boosted to a higher voltage, and the relay RL1
And are connected in parallel.

The secondary battery 40 is charged from the charging circuit 30 through the relay RL2, and the voltage regulator 50 reduces the power from the secondary battery 40 through the relay RL3 and the power from the power generation circuit 20 through the relay RL4. And outputs a regulator voltage (predetermined constant voltage).

The electromotive force detection circuit 60 is supplied with a voltage from the voltage regulator 50 and relays the voltage in accordance with the positive terminal voltage of the secondary battery 40 (hereinafter referred to as the battery voltage VD) and the power generation voltage VS of the power generation circuit 20. ON of RL1 to relay RL4,
The off control and the control of activation and stop of the booster circuit 31 are performed.

The tire condition detecting device 70 is supplied with power from the voltage regulator 50, detects the pressure in the tire T,
The data of the detected pressure is output using a radio wave as a medium. The alarm device 80 is provided in the vehicle body, receives the data of the detected pressure through a receiving antenna, and turns on a warning lamp according to the data.

Hereinafter, control processing in the electromotive force detection circuit 60 will be described with reference to the flowchart shown in FIG.

First, it is determined whether or not the tire T is rotating (step 100). Specifically, the generated voltage VS
Is detected, and the detected power generation voltage VS is compared with a first threshold value (for example, 1 V). When the detected power generation voltage VS is lower than the first threshold value, it is determined that the tire T is stopped and NO
And the process proceeds to step 101.

Subsequently, the relay RL1 is turned off (step 101), and the booster circuit 31 is stopped (step 10).
2), the relay RL2 is turned off (step 103).
As a result, the output terminal of the power generation circuit 20 and the secondary battery 4
The connection to the positive terminal of 0 is cut off. Next, at step 104, the relay RL3 is turned off. As a result, the connection between the output terminal of the power generation circuit 20 and the input terminal of the voltage regulator 50 is cut off.

Further, at step 105, the relay RL4
Turn on. As a result, the connection between the positive terminal of the secondary battery 40 and the input terminal of the voltage regulator 50 is established.

Therefore, the voltage regulator 50 is supplied with power from the secondary battery 40 and outputs the regulator voltage to the tire condition detecting device 70. Therefore, the tire condition detecting device 70 detects the pressure in the tire T and outputs data of the detected pressure using a radio wave as a medium. And the alarm device 80
Receives the data of the detected pressure through the receiving antenna, and determines the puncture of the tire T based on the data.

As a result, when it is determined that the tire T is punctured, the alarm device 80 turns on the alarm lamp. This notifies the driver of the car that "the tire T is punctured".

Next, at step 100, when the generated voltage VS is higher than the first threshold value, it is determined that the tire T is rotating, and the determination is YES, and the routine proceeds to step 110.

Then, in step 110, the electromagnetic coil 2
It is determined whether the electromotive force generated in 1 is sufficient for the tire condition detecting device 70. Specifically, the generated voltage V
S is detected, and the detected power generation voltage VS is compared with a second threshold value (for example, 2 V). When the detected power generation voltage VS is higher than the second threshold value, it is determined that the electromotive force generated in the electromagnetic coil 21 is sufficient for the tire condition detecting device 70, and the determination is YES, and the process proceeds to step 111.

Next, at step 111, the electromagnetic coil 21
It is determined whether the generated electromotive force is excessive for the tire condition detection device 70 or not. Specifically, the generated voltage VS
Is detected, and the detected power generation voltage VS is compared with a third threshold value (for example, 3 V). When the detected power generation voltage VS is lower than the third threshold value, it is determined that the electromotive force generated in the electromagnetic coil 21 is not excessive with respect to the tire condition detection device 70, and the determination is NO.

Subsequently, the processing of steps 101 to 103 is performed. As a result, the connection between the output terminal of the power generation circuit 20 and the positive terminal of the secondary battery 40 is cut off. Further, relay RL4 is turned off (step 112). As a result, the positive terminal of the secondary battery 40 and the voltage regulator 50
Between the input terminals of the first and second terminals.

Then, the relay RL3 is turned on (step 113). As a result, the output terminal of the power generation circuit 20 and the input terminal of the voltage regulator 50 are connected, and the voltage regulator 50 is supplied with power by the power generation circuit 20 and outputs a regulator voltage to the tire condition detection device 70.

Next, at step 111, the detected power generation voltage V
When S is higher than the third threshold value, it is determined that the electromotive force generated in the electromagnetic coil 21 is excessive for the tire state detection device 70, and the determination is YES, and the process proceeds to Step 120.

Here, it is determined whether or not the secondary battery 40 is exhausted (that is, whether or not the charging capacity is low). Specifically, the positive terminal voltage of the secondary battery 40 (hereinafter, referred to as the positive terminal voltage)
The storage voltage VD is compared with a fourth threshold value (for example, 2 V), and when the storage voltage VD is higher than the fourth threshold value, it is determined that the secondary battery 40 has not been exhausted and NO is determined, and the process proceeds to step 121. .

Subsequently, the generated voltage VS and the stored voltage VD are detected, and the generated voltage VS and the stored voltage VD are compared (step 121). When the generated voltage VS is higher than the storage voltage VD, the relay RL1 is turned on (step 122), and the booster circuit 31 is stopped (step 10).
2). Next, the relay RL2 is turned on (step 12).
3) Turn off step RL4 (step 112).

As a result, the output terminal of the power generation circuit 20 is connected to the positive terminal of the secondary battery 40 through the relays RL1 and RL2, and the connection between the positive terminal and the voltage regulator 50 is cut off. For this reason, the secondary battery 40 is connected to the relay R
It is charged by the power generation circuit 20 through L1 and RL2.

Next, the processing of steps 112 and 113 is performed, and the output terminal of the power generation circuit 20 and the voltage regulator 50
And the input terminal of the voltage regulator 50
Are supplied by the power generation circuit 20.

Thereafter, a process of elapse of a set time by a timer (not shown) is performed (130). As a result, the secondary battery 40 is charged continuously by the power generation circuit 20 through the relays RL1 and RL2 for the set time.

Next, at step 121, when the generated voltage VS is lower than the storage voltage VD, the relay RL1 is turned off (step 101). Next, the relay RL2 is turned on (Step 130), and Step RL4 (Step 11)
2) is turned off, and the booster circuit 31 is operated (step 130).

As a result, the output terminal of the power generation circuit 20 is connected to the positive terminal of the secondary battery 40 through the booster circuit 31 and the relay RL2, and the connection between the positive terminal and the voltage regulator 50 is cut off. For this reason, the booster circuit 31
The power generation voltage VS is boosted and output to the secondary battery 40. As a result, the secondary battery 40 is charged by receiving the generated voltage VS boosted by the boosting circuit 31.

Next, the relay RL3 is turned on (step 113). This allows the voltage regulator 50
Is supplied with power from the power generation circuit 20 and outputs a regulator voltage to the tire condition detection device 70.

Thereafter, the processing of step 130 is performed.
The secondary battery 40 is continuously charged by the power generation circuit 20 through the booster circuit 31 and RL2 for the set time.

As described above, the permanent magnet 10 is
Is disposed, the power generation circuit 20 is disposed in the tire, and the tire state detection device 70 receives and operates the power generated in the power generation circuit 20 based on the rotation of the tire T, so that the tire state detection device 70 can be operated. Time can be lengthened.

When the secondary battery 40 is disposed in the tire T and the tire T is not rotating, the electric power stored in the secondary battery 40 is supplied to the tire condition detecting device 70. Tire condition detecting device 70 even during stop
Can be operated.

Here, since the power generated in the power generation circuit 20 is stored in the secondary battery 40, the tire condition detecting device 7
An increase in the weight of the entire tire T can be suppressed as compared with a case where the storage capacity of the battery is increased in order to extend the operable time of zero.

Further, when the power generation voltage VS of the power generation circuit 20 is lower than the storage voltage VD of the secondary battery 40, the power generation voltage VS from the power generation circuit 20 is boosted by the booster circuit 31 and output to the secondary battery 40. Like that. Therefore, the power generated in the power generation circuit 20 can be efficiently stored in the secondary battery 40.

In carrying out the present invention, the secondary battery 4
Instead of 0, a storage capacitor may be employed.

In practicing the present invention, a plurality of permanent magnets and electromagnetic coils may be employed, and the plurality of magnets and electromagnetic coils may generate electric power in the tire T according to the rotation.

In practicing the present invention, an electric magnet may be used instead of a permanent magnet.

Further, in the above embodiment, the power generation circuit 20
And the explanation was given for the example using the secondary battery 40,
The invention is not limited thereto, and the secondary battery 40 may not be adopted.

[Brief description of the drawings]

FIG. 1 is a schematic view of a tire pressure detection system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an electric circuit configuration of the tire internal pressure detection system.

FIG. 3 is a flowchart showing an operation of the electromotive force detection circuit shown in FIG.

[Explanation of symbols]

10: permanent magnet, 20: power generation circuit, 21: electromagnetic coil,
Reference numeral 30: charging circuit, 31: boosting circuit, 40: secondary battery, 5
0: voltage regulator, 60: electromotive force detection circuit, 70:
Tire condition detection device, 80 alarm device, RL1 to RL4
…relay.

Claims (4)

    [Claims]
  1. A pressure detecting device (7) disposed in a tire of a moving body and detecting a pressure in the tire and outputting a detection signal.
    0), and a transmission device (80) for transmitting a pressure state in the tire to an occupant of the moving body based on a detection signal output from the pressure detection device, A magnetic field line generator (10) disposed on the main body of the moving body to generate magnetic lines of force; and a magnetic field line generator (10) disposed in the tire and, when the tire rotates, according to electromagnetic induction by the magnetic field lines from the magnetic field line generator. A voltage generating circuit (20) having an electromagnetic coil (21) for generating an AC voltage and outputting a voltage corresponding to the AC voltage; and a voltage output for outputting the voltage output from the voltage generating circuit to the pressure detecting device. And a device (RL3, 50).
  2. 2. A pressure detecting device (7) disposed in a tire of a moving body and detecting a pressure in the tire and outputting a detection signal.
    0), and a transmission device (80) for transmitting a pressure state in the tire to an occupant of the moving body based on a detection signal output from the pressure detection device, A magnetic field line generator (10) disposed on the main body of the moving body to generate magnetic lines of force; and a magnetic field line generator (10) disposed in the tire and, when the tire rotates, according to electromagnetic induction by the magnetic field lines from the magnetic field line generator. A voltage generating circuit (20) having an electromagnetic coil (21) for generating an AC voltage and outputting a voltage corresponding to the AC voltage, and a power storage device for storing power based on the voltage output from the voltage generating circuit (40) a voltage output device (RL1) that outputs a voltage from one of the power storage device and the voltage generation circuit to the pressure detection device.
    To RL4, 50, 60).
  3. 3. A voltage output device comprising: a comparing unit (121) for comparing a voltage output from the voltage generating circuit with a threshold voltage, wherein the voltage output device outputs the threshold voltage from the voltage generating circuit. 3. The tire pressure detection system according to claim 2, wherein when the voltage is higher, the voltage output from the voltage generation circuit is output to both the power storage device and the pressure detection device. 4.
  4. 4. A booster circuit (3) that boosts a voltage output from the voltage generation circuit (20) and outputs the boosted voltage to the power storage device.
    The tire pressure detection system according to claim 3, further comprising (1).
JP11159697A 1999-06-07 1999-06-07 System for detecting pressure in tire Withdrawn JP2000346735A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11159697A JP2000346735A (en) 1999-06-07 1999-06-07 System for detecting pressure in tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11159697A JP2000346735A (en) 1999-06-07 1999-06-07 System for detecting pressure in tire

Publications (1)

Publication Number Publication Date
JP2000346735A true JP2000346735A (en) 2000-12-15

Family

ID=15699351

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11159697A Withdrawn JP2000346735A (en) 1999-06-07 1999-06-07 System for detecting pressure in tire

Country Status (1)

Country Link
JP (1) JP2000346735A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005214861A (en) * 2004-01-30 2005-08-11 Aichi Tokei Denki Co Ltd Digital self-recording pressure gage for governor chamber
JP2008001342A (en) * 2006-06-22 2008-01-10 Silicon Valley Micro C Corp Tire parameter monitoring system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005214861A (en) * 2004-01-30 2005-08-11 Aichi Tokei Denki Co Ltd Digital self-recording pressure gage for governor chamber
JP4532918B2 (en) * 2004-01-30 2010-08-25 愛知時計電機株式会社 Digital self-recording pressure gauge for governor room
JP2008001342A (en) * 2006-06-22 2008-01-10 Silicon Valley Micro C Corp Tire parameter monitoring system
KR101388177B1 (en) * 2006-06-22 2014-04-23 실리콘 밸리 마이크로 씨 코포레이션 Tire parameter monitoring system with inductive power source

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