JP3459541B2 - Vehicle tire pressure detector - Google Patents

Vehicle tire pressure detector

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Publication number
JP3459541B2
JP3459541B2 JP19187697A JP19187697A JP3459541B2 JP 3459541 B2 JP3459541 B2 JP 3459541B2 JP 19187697 A JP19187697 A JP 19187697A JP 19187697 A JP19187697 A JP 19187697A JP 3459541 B2 JP3459541 B2 JP 3459541B2
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JP
Japan
Prior art keywords
tire pressure
wheel
vehicle
transmitting
tire
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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.)
Expired - Fee Related
Application number
JP19187697A
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Japanese (ja)
Other versions
JPH1120427A (en
Inventor
道哉 加藤
克彦 岩崎
和則 澤藤
Original Assignee
トヨタ自動車株式会社
太平洋工業株式会社
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.)
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Application filed by トヨタ自動車株式会社, 太平洋工業株式会社 filed Critical トヨタ自動車株式会社
Priority to JP19187697A priority Critical patent/JP3459541B2/en
Publication of JPH1120427A publication Critical patent/JPH1120427A/en
Application granted granted Critical
Publication of JP3459541B2 publication Critical patent/JP3459541B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire pressure detecting device for a vehicle, and more particularly, to a tire pressure detecting device using tire pressure detecting means provided on wheels. Related to the device. 2. Description of the Related Art As one of tire pressure detecting devices for vehicles such as automobiles, a tire pressure sensor provided on a wheel and a tire pressure sensor provided on a wheel, as described in, for example, Japanese Patent Application Laid-Open No. Hei 6-197404. Wireless transmission means for wirelessly transmitting a signal indicating the tire pressure detected by the tire pressure sensor, a power supply provided on the wheels for supplying power to the tire pressure sensor and the wireless transmission means, and a signal provided on the vehicle body and indicating the tire pressure Conventionally, there is known a tire pressure detecting device having a wireless receiving means for wirelessly receiving the tire pressure, and configured so that power is supplied to a tire pressure sensor and a wireless transmitting means from a power supply provided in a wheel. According to such a tire pressure detecting device, the tire pressure of each wheel is directly detected by the tire pressure sensor, so that each tire pressure is accurately detected as compared with the case where the tire pressure is estimated based on the wheel speed of each wheel. Tire pressure can be detected, and a signal indicating the detected tire pressure is wirelessly transmitted from the wheel side wireless transmission means to the vehicle body side wireless reception means. A signal indicating the tire pressure can be reliably transmitted to the vehicle body for a longer period of time than when used. [0004] However, in the conventional tire pressure detecting device as described above, a signal indicating the tire pressure detected by the tire pressure sensor is constantly transmitted wirelessly by the wireless transmission means. Therefore, the power consumption by these components is high, so that when the power source is a battery, it is difficult to detect the tire pressure over a long period of time.
In order to detect tire pressure over a long period of time, a generator driven by rotation of the wheel must be provided on the wheel as described in the above-mentioned publication, and the structure of the tire pressure detection device However, there is a problem that it becomes complicated and expensive. According to the present invention, a signal indicating a tire pressure detected by a tire pressure detecting means provided on a wheel is wirelessly transmitted from a wireless transmitting means on a wheel side to a wireless receiving means on a vehicle body. The present invention has been made in view of the above-described problems in the tire pressure detection device, and a main problem of the present invention is to prevent a signal indicating a tire pressure from being unnecessarily transmitted from the wheel side to the vehicle body side. Thus, the power consumption by the tire pressure detecting means and the wireless transmitting means is reduced. According to the present invention, the main problems as described above are detected by a tire pressure detecting means provided on a wheel and a tire pressure detecting means provided on the wheel. Transmitting means for transmitting a signal indicating the tire pressure, and a power supply provided on the wheels for supplying power to the tire pressure detecting means and the transmitting means, and means for detecting the running state of the vehicle provided on the wheels, and control means for operating said transmission means based on the running state of the vehicle, have a receiving means for receiving a signal indicative of the tire pressure is provided to the vehicle body, the control unit has been previously transmitted Thailand
Tire pressure and the tire pressure to be transmitted this time
When the size is less than the reference value, power is supplied to the transmitting means.
It is achieved depending on the tire air pressure detecting device (configuration of claim 1), characterized in that it is configured not. According to the first and second aspects of the present invention, the running state of the vehicle is detected, and the transmitting means is operated by the control means based on the running state of the vehicle. Therefore, only when the vehicle is in the running state. For example, it is possible to periodically transmit a signal indicating the tire pressure from the transmitting means to the receiving means, so that the power consumption is greatly reduced as compared with a case where the signal indicating the tire pressure is constantly transmitted wirelessly. Again
Times transmitted tire pressure and this time transmitted tire
If the deviation from the air pressure is less than the reference value,
Since no power is supplied to the gear, the tire pressure detection frequency
Unnecessary transmission of tire pressure without excessive reduction
Is reliably avoided, and the previously transmitted tire empty
Large deviation between atmospheric pressure and tire pressure to be transmitted this time
Regardless, compared to when power is supplied to the transmitting means
The power consumption of the tire pressure detecting device is further reduced . According to a preferred aspect of the present invention, there is provided the above-described first or second aspect, wherein:
The power source is configured to be a battery (preferred embodiment 1). According to another preferred aspect of the present invention, in the configuration of the first or second aspect, the means for detecting the running state of the vehicle is provided with a centrifugal force equal to or more than a predetermined value generated by the rotation of the wheels. It is configured to be a centrifugal switch that closes in response (preferred embodiment 2). According to another preferred aspect of the present invention, in the configuration of claim 1 or 2, the transmitting means and the receiving means are each constituted by a wireless transmitting means and a receiving means. Preferred embodiment 3). According to another preferred embodiment of the present invention, in the configuration of the third preferred embodiment, the control means supplies power from the power supply to the transmission means at predetermined time intervals when the vehicle is in a running state. By doing so, the transmitting means is operated (preferred mode 4). According to another preferred embodiment of the present invention, in the configuration of the preferred embodiment 4, the control means switches the vehicle from the non-running state to the running state regardless of whether a predetermined time has elapsed. Upon shifting, the power supply supplies power to the transmission means to operate the transmission means (preferred mode 5). According to another preferred embodiment of the present invention, in the configuration of the above-mentioned preferred embodiment 4, when the vehicle is in a running state, the control means controls the tire pressure detecting means and the transmission from the power source at predetermined time intervals. It is configured to operate the tire pressure detecting means and the transmitting means by supplying power to the means (preferred mode 6). According to another preferred embodiment of the present invention, in the configuration of the above-mentioned preferred embodiment 6, the control means switches the vehicle from the non-running state to the running state regardless of whether a predetermined time has elapsed. After the shift, the power is supplied from the power supply to the tire pressure detecting means and the transmitting means to operate the tire pressure detecting means and the transmitting means (preferred mode 7). According to another preferred aspect of the present invention, in the configuration of the second aspect, the estimating means is configured to estimate the tire pressure of the wheel based on the wheel speed by a disturbance observer method (preferably). Aspect 8 ). Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing one embodiment of a tire pressure detecting device for a vehicle according to the present invention, and FIG. 2 is a schematic diagram showing a wheel provided with an air pressure sensor, a centrifugal switch, a radio transmitting device and a battery. illustration shown in FIG. 3 is a block diagram showing overall the implementation forms. As shown in FIG. 1, the left front wheel 10FL,
The right front wheel 10FR, the left rear wheel 10RL, and the right rear wheel 10RR have tire pressures Psi (i = fl, fr, rl,
rr) to detect the air pressure sensors 12FL, 12FR, 12RL,
12RR and centrifugal switches 14FL, 14FR, 14RL, 1
4RR, wireless transmission device 16FL, 16FR, 16RL, 16RR
And batteries 18FL, 18FR, 18RL, 1
8RR is provided. Each of the air pressure sensors, the centrifugal switch, the wireless transmitter, and the battery may be housed in an integrated housing. The centrifugal switches 14FL, 14FR, 14RL,
14RR closes when the centrifugal force generated by the rotation of the left front wheel 10FL, the right front wheel 10FR, the left rear wheel 10RL, and the right rear wheel 10RR exceeds a predetermined value, and outputs an ON signal. Signal indicating the tire pressure Psi detected by the pneumatic sensors 12FL, 12FR, 12RL, 12RR and the centrifugal switch 1
The ON signals from 4FL, 14FR, 14RL, and 14RR are input to radio transmission devices 16FL, 16FR, 16RL, and 16RR, respectively. As shown in the block diagram of FIG. 3, each radio transmission device 16 includes a control unit 16A and a transmission unit 16B.
The controller 16A periodically supplies power from the battery 18 to the air pressure sensor 12 and the transmitter 16B in accordance with the flowchart shown in FIG. While detecting Psi, the transmitting unit 16B is operated to wirelessly transmit a signal indicating the tire pressure Psi. As shown in FIG. 1, the left front wheel 10FL, the right front wheel 10FR, the left rear wheel 10RL, and the right rear wheel 10RR of the vehicle body 20 are shown.
Are located close to the radio receivers 22FL, 22FL, respectively.
2FR, 22RL and 22RR are provided. Each wireless receiving device corresponds to a corresponding wireless transmitting device 16FL, 16FR, 1
A signal indicating the tire pressure Psi wirelessly transmitted from the transmitters 6RL and 16RR is received and output to the control device 24. The control device 24 compares the tire pressure Poi of each wheel with a reference value, and outputs a control signal to the alarm device 26 when the tire pressure Psi is less than the reference value, thereby issuing an alarm to the occupant of the vehicle. The radio transmission devices 16FL, 16FR, 16RL,
16RR and radio receiver 22FL, 22FR, 22RL, 22
The RR may have any configuration as long as it can communicate wirelessly without requiring wiring between each wheel and the vehicle body 20, and may be, for example, a radio wave type, a sound wave type, or a light type device. The control unit 16A and the control device 24 of each wireless transmission device 16 include, for example, a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM) backed up by a power supply, an input / output port device. And these may be microcomputers connected to each other by a bidirectional common bus. Next, a tire pressure detection and transmission control routine will be described with reference to the flowchart shown in FIG. This routine is repeatedly executed at predetermined time intervals. The flag F relates to whether or not the centrifugal switch 14 is on, and 1 indicates that the centrifugal switch 14 is on. First, at step 10, it is determined whether or not the flag F is 1. If the determination is affirmative, the process proceeds to step 40, and if the determination is negative, the process proceeds to step 20. In step 20, it is determined whether or not the centrifugal force switch 14 is on, that is, whether or not the vehicle is in a running state. If a negative determination is made, the process returns to step 10, and When an affirmative determination is made, the flag F is set to 1 in step 30, and then the routine proceeds to step 80. In step 40, the count value T of the timer is incremented by To (positive constant), and in step 50, the count value T of the timer is incremented by the reference value Tc.
It is determined whether or not the value is equal to or more than (positive constant). If a negative determination is made, the process returns to step S10. If an affirmative determination is made, the process proceeds to step S60. In step 60, it is determined whether or not the centrifugal force switch 14 is on, as in step 20, and if a negative determination is made, the flag F is reset to 0 in step 70. After step 100
When the affirmative determination is made, the tire pressure Psi is detected by supplying power to the air pressure sensor 12 in step 80, and a signal indicating the tire pressure is read. Steps to be executed after step 80
At 85, the tire pressure Psfi previously transmitted
(I = fl, fr, rl, rr) and the tire empty to be transmitted this time
The absolute value of the deviation ΔPsi from the atmospheric pressure Psi is the reference value ΔPc (positive
Is determined, and a positive determination is made.
Proceeds to step 100 when a negative determination is made
Signal indicating the tire pressure Psi by power to signal section 16B send In Kiniwa step 90 is supplied is wirelessly transmitted to the corresponding radio receiving apparatus 22 Rutotomoni, data
The previous transmission value Psfi of the ear air pressure is updated to the current value Psi.
Re that. In step 100, the count value T of the timer is reset to 0, and thereafter, the process returns to step 10. Thus, according to this embodiment, in steps 40 to 60, it is determined whether or not the centrifugal force switch 14 is on at every Tc such as one hour, that is, whether or not the vehicle is in a running state. Each time Tc elapses in a state where the vehicle is running, step 8 is performed.
At 0 and 90, the air pressure sensor 12 and the wireless transmission device 1
6, the power is supplied from the battery 18 to the transmitting unit 16B,
The tire pressure Psi is detected, and a signal indicating the tire pressure is wirelessly transmitted. Therefore, the tire tire pressure is detected and the signal indicative of the tire pressure is transmitted wirelessly regardless of whether the vehicle is in a stopped state or the vehicle is running. The power consumption by the air pressure detection device is greatly reduced, so that even if the power source is a battery, tire pressure can be detected for a long period of time. The structure of the tire pressure detection device can be simplified and the cost can be reduced as compared with the case of the first embodiment. In particular, according to the illustrated embodiment, the tire air
Tire pressure without excessively reducing pressure detection frequency
To avoid unnecessary transmissions,
Tire pressure sent last time and Thailand to be sent this time
Power to the transmission means regardless of the magnitude of the deviation from the air pressure
Tire pressure detection device even more than when supplied
Power consumption can be reduced. Also , according to the illustrated embodiment, step 1
At 0, it is determined whether the flag F is 1 or not.
When a negative determination is made, a determination is made in step 20 as to whether the centrifugal force switch 14 is on, and when an affirmative determination is made, the flag F is set to 1 in step 30. Thereafter, the process proceeds to step 80, so that the vehicle stops when the time Tc has elapsed, and the vehicle resumes running even if the tire pressure is not detected and the wireless transmission is not performed due to the negative determination in step 60. Then, an affirmative determination is made in step 20. Therefore, as compared with the case where steps 10 to 30 are not performed, the possibility that the frequency of tire pressure detection and wireless transmission is excessively reduced can be reduced. Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to the above-described embodiments, and various other embodiments may be included within the scope of the present invention. It will be clear to those skilled in the art that is possible. For example, in the illustrated embodiment, power is supplied from the battery 18 to both the air pressure sensor 12 and the transmitter 16B of the wireless transmitter 16 every time the time Tc elapses while the vehicle is running. However, the power may be constantly supplied to the air pressure sensor 12 which consumes a relatively small amount of power. As is apparent from the above description, according to the first aspect of the present invention, the tire pressure is transmitted from the transmitting means to the receiving means only when the vehicle is running, for example, periodically. Can be transmitted, and therefore, the power consumption can be greatly reduced as compared with the case where the signal indicating the tire pressure is constantly transmitted wirelessly, whereby the power supply is a battery. Tire pressure can be detected over a long period of time, and the
Deviation between ear pressure and tire pressure to be transmitted this time
Power is supplied to the transmission means when the size of the
The tire pressure detection frequency is excessively reduced.
Avoid unnecessary transmission of tire pressure
The tire pressure transmitted last time
And the magnitude of the deviation from the tire pressure to be transmitted this time
Regardless, compared to the case where power is supplied to the transmission means,
To further reduce the power consumption of the tire pressure detection device
It is Ru can. In addition, there is no need to provide a generator as a power source for each wheel, or to provide a wireless receiving means for transmitting a command for detecting and transmitting tire pressure of the wheel from a control device on the vehicle body to the wheel. In addition, it is possible to reliably avoid complication of the structure of the tire pressure detecting device and increase in cost.

One BRIEF DESCRIPTION OF THE DRAWINGS [Figure 1] vehicle tire air pressure detecting device according to the present invention
It is a schematic structure figure showing one embodiment. FIG. 2 is an explanatory diagram generally showing wheels provided with an air pressure sensor, a centrifugal switch, a wireless transmission device, and a battery. 3 is a block diagram showing overall the implementation forms. 4 is a flowchart illustrating the detection and transmission control routine in the tire air pressure implementation forms. [Description of Signs] 12FL-12RR ... Air pressure sensor 14FL-14RR ... Centrifugal force switch 16FL-16RR ... Wireless transmitting device 18FL-18RR ... Battery 22FL-22RR ... Wireless receiving device 24 ... Control device 26 ... Alarm device 28FL-28RR ... Wheel Speed sensor

Continuation of the front page (72) Inventor Kazunori Sawafuji 1300-1 Kobe-cho, Anpachi-gun, Gifu Prefecture Inside the Kita-Ogaki Plant of Taiheiyo Kogyo Co., Ltd. (56) References JP-A-7-52621 (JP, A) (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) B60C 23/00-23/08

Claims (1)

  1. (57) Claims: 1. Tire pressure detection means provided on a wheel, and transmission means provided on the wheel for transmitting a signal indicating a tire pressure detected by the tire pressure detection means. A power supply provided on the wheel to supply power to the tire pressure detecting means and the transmitting means, a means provided on the wheel for detecting a running state of the vehicle, and operating the transmitting means based on the running state of the vehicle and control means for, have a receiving means for receiving a signal indicative of the tire pressure is provided on the vehicle body, a tire air control means previously transmitted
    The magnitude of the deviation between the pressure and the tire pressure to be transmitted this time
    Do not supply power to the transmission means when is less than the reference value.
    A tire pressure detection device characterized by having the following configuration .
JP19187697A 1997-07-02 1997-07-02 Vehicle tire pressure detector Expired - Fee Related JP3459541B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19187697A JP3459541B2 (en) 1997-07-02 1997-07-02 Vehicle tire pressure detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19187697A JP3459541B2 (en) 1997-07-02 1997-07-02 Vehicle tire pressure detector

Publications (2)

Publication Number Publication Date
JPH1120427A JPH1120427A (en) 1999-01-26
JP3459541B2 true JP3459541B2 (en) 2003-10-20

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ID=16281954

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Application Number Title Priority Date Filing Date
JP19187697A Expired - Fee Related JP3459541B2 (en) 1997-07-02 1997-07-02 Vehicle tire pressure detector

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015145878A (en) * 2006-06-05 2015-08-13 カブリコ コーポレイション Method and apparatus for tire pressure monitoring

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3997819B2 (en) * 2002-02-18 2007-10-24 トヨタ自動車株式会社 Tire condition acquisition device
JP3960112B2 (en) 2002-04-22 2007-08-15 トヨタ自動車株式会社 Tire condition detection / communication device
JP3988926B2 (en) 2002-07-31 2007-10-10 ヤマハ発動機株式会社 Apparatus for detecting tire pressure and other conditions in a motorcycle
JP3997864B2 (en) 2002-08-14 2007-10-24 トヨタ自動車株式会社 Wheel state acquisition device and vehicle state acquisition device
US7233850B2 (en) 2002-10-31 2007-06-19 Koyo Seiko Co., Ltd. Vehicle steering apparatus
JP4121843B2 (en) * 2002-12-12 2008-07-23 横浜ゴム株式会社 Tire sensor device
WO2004089659A1 (en) * 2003-04-09 2004-10-21 Continental Teves Ag & Co. Ohg Device and method for monitoring tyre pressures
US7289022B2 (en) 2003-06-05 2007-10-30 Toyota Jidosha Kabushiki Kaisha Communication system and method for communicating between a tire/wheel assembly and a vehicle body
JP4193731B2 (en) * 2004-03-04 2008-12-10 三菱自動車工業株式会社 Tire pressure warning system
JP4650077B2 (en) 2005-04-20 2011-03-16 トヨタ自動車株式会社 Wheel state acquisition device
KR100666796B1 (en) 2005-07-28 2007-01-09 현대자동차주식회사 Rising structure for rf sensor of tire pressure monitoring system
JP4752661B2 (en) 2006-08-01 2011-08-17 株式会社デンソー Transmitter and tire pressure detecting device having the same
DE102009005904A1 (en) * 2009-01-23 2010-07-29 Continental Automotive Gmbh Method and device for continuously determining wheel state variables of a wheel
JP5346099B2 (en) * 2012-02-22 2013-11-20 シリコン・バレイ・マイクロ・シイ・コーポレーション Tire pressure sensor system with improved sensitivity and power saving

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015145878A (en) * 2006-06-05 2015-08-13 カブリコ コーポレイション Method and apparatus for tire pressure monitoring

Also Published As

Publication number Publication date
JPH1120427A (en) 1999-01-26

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