US20020047779A1 - Apparatus and method for alarming decrease in tire air-pressure - Google Patents
Apparatus and method for alarming decrease in tire air-pressure Download PDFInfo
- Publication number
- US20020047779A1 US20020047779A1 US09/943,206 US94320601A US2002047779A1 US 20020047779 A1 US20020047779 A1 US 20020047779A1 US 94320601 A US94320601 A US 94320601A US 2002047779 A1 US2002047779 A1 US 2002047779A1
- Authority
- US
- United States
- Prior art keywords
- wheel speed
- speed information
- tires
- decrease
- pressure
- 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
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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
- B60C23/06—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle
- B60C23/061—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle by monitoring wheel speed
-
- 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
Definitions
- the present invention relates to an apparatus and a method for alarming a decrease in tire air-pressure and, more particularly, to an apparatus and a method for alarming a decrease in tire air-pressure, in which an installation space can be saved and the cost of manufacturing can be reduced.
- an apparatus for alarming a decrease in tire air-pressure of a system for detecting a change in tire air-pressure based on variations in wheel speed information is configured such that a sine-wave analog signal output from a wheel speed sensor provided in each of four wheels is taken out via a special signal line, to be then captured as a pulse of a wheel speed signal through a binarization circuit, as illustrated in FIG. 5, or that a signal is directly captured from another calculator having a wheel speed signal captured therein, for example, an ABS calculator via a memory, and an alarm is issued upon detection of a decrease in tire air-pressure, as illustrated in FIG. 6.
- the alarming apparatus in which the signal line is used exclusively for each of the wheel speed signals, needs four pieces (or sets) of signal lines, and therefore, has been not acceptable in the current circumstance in which the cost is to be cut down by reducing the number of lines as possible.
- the above-described alarming apparatus in which the wheel speed signal is captured from the other calculator via the memory, need to use both of the calculator and the memory. Consequently, the alarming apparatus must be mounted on a substrate on which the calculator capturing the wheel speed signal is mounted, thereby arising a problem of severe limitation of the freedom of design for mounting the alarming apparatus and the calculator.
- the communication line in the above-described detecting apparatus connects the ABS microcomputer to the microcomputer for an apparatus for alarming a decrease in tire air-pressure in a one-to-one correspondence, and therefore, the communication line is increased in length in the case where the two microcomputers are positioned apart from each other, thereby arising problems of easy occurrence of a communication error in addition to an increase in cost, resulting in the low freedom of the layout of the microcomputer.
- an object of the present invention is to provide an apparatus and a method for alarming a decrease in tire air-pressure, in which the cost of manufacturing can be reduced by using an on-vehicle communication network (hereinafter referred to as an on-vehicle LAN).
- an on-vehicle LAN on-vehicle communication network
- an apparatus for alarming a decrease in tire air-pressure which alarms the decrease in inner pressure of the tire by using a judged value calculated based on wheel speed information obtained from tires fitted to a four-wheeled vehicle, comprising calculating means for calculating the judged value based on the wheel speed information on each of the tires, the calculating means being connected to one of on-vehicle LANs, via which the wheel speed information on each of the tires is transmitted wherein the calculates means captures the wheel speed information on each of the tires via one of the on-vehicle LANs.
- a method for alarming a decrease in tire air-pressure which alarms the decrease in inner pressure of the tire by using a judged value calculated based on wheel speed information obtained from tires fitted to a four-wheeled vehicle, comprising the step of capturing the wheel speed information on each of the tires into calculating means for calculating the judged value based on the wheel speed information on each of the tires via one of on-vehicle LANs.
- FIG. 1 is a block diagram illustrating an embodiment of an apparatus for alarming a decrease in tire air-pressure according to the present invention
- FIG. 2 illustrates the state in which wheel speed information is captured in a first embodiment according to the present invention
- FIG. 3 is a block diagram illustrating the electric configuration of the apparatus for alarming a decrease in tire air-pressure of FIG. 1;
- FIG. 4 illustrates the state in which wheel speed information is captured in a third embodiment according to the present invention
- FIG. 5 illustrates the state in which wheel speed information is captured in the prior art
- FIG. 6 illustrates another state in which wheel speed information is captured in the prior art.
- the wheel speed information detecting means 1 takes the form of, for example, a wheel speed sensor for measuring a wheel speed from the number of rotation pulses generated by using an electromagnetic pickup of the like, or an angular velocity sensor for measuring a wheel speed from a voltage generated by using rotation by a dynamo electric.
- An apparatus for alarming a decrease in tire air-pressure which is mounted on a vehicle, in the present embodiment is not specially limited as long as the apparatus is adapted to alarm a decrease in inner pressure of a tire by using a judged value calculated based on wheel speed information obtained from tires fitted to a four-wheeled vehicle.
- the apparatus comprises, for example, wheel speed information detecting means for detecting wheel speed information on each of the tires, memory means for storing therein the wheel speed information on each of the tires, and calculating means for calculating a judged value based on the wheel speed information on each of the tires.
- the wheel speed information (a wheel speed signal) detected by wheel speed information detecting means 1 disposed in each of the tires is captured into a calculator 2 for an ABS or the like, and then, the wheel speed signal is converted into digital data, so that data on the wheel speed information (i.e., wheel speed data) is transmitted to an apparatus 4 for alarming a decrease in tire air-pressure via an on-vehicle LAN 3 , and finally, is captured into the above-described calculating means.
- a rotational angular velocity of each of the tires is obtained based on the data on the wheel speed information.
- the sum of the rotational angular velocities of a diagonal pair of tires is subtracted from the sum of the rotational angular velocities of another diagonal pair of tires.
- a ratio (a judged value) of the subtraction result to an average value of the two sums exceeds a predetermined threshold value, a decrease in tire air-pressure is judged, so that an alarm is issued.
- a display 5 consisting of a liquid crystal display element, a plasma display element or a CRT for teaching a tire W i having a decreased air pressure and an initialization switch 6 which can be operated by a driver.
- the ABS calculator To the above-described on-vehicle LAN 3 are connected the ABS calculator, the apparatus for alarming the decrease in tire air-pressure and other calculators, for transmitting or receiving various data in addition to the wheel speed data.
- a signal of the initialization switch or an alarm output for the display might be transmitted or received with the use of the on-vehicle LAN 3 .
- the calculating means and the memory means are included in a calculator consisting of an I/O interface 4 a required for transmitting or receiving a signal to or from the on-vehicle LAN 3 , a CPU 4 b which functions as a center of calculation, a ROM 4 c storing therein a control program for the CPU 4 b , and a RAM 4 d , in or from which data is temporarily written or the written data is read when the CPU 4 b performs a control operation.
- the wheel speed signal is converted into the digital data, which is then captured via the on-vehicle LAN, thereby remarkably reducing the number of the conventional signal lines. Consequently, the cost of manufacturing can be reduced. Moreover, the apparatus for alarming the decrease in tire air-pressure can be disposed wherever the on-vehicle LAN is laid, thus increasing the freedom of design.
- the wheel speed is very slightly varied according to the decrease in tire air-pressure.
- the wheel speed is varied by about 0.2% with respect to a decrease in pressure of 30%.
- the wheel speed information can be captured in 2 bytes in the case where the receivable data on the wheel speed information has been already calculated with sufficient accuracy.
- a wheel speed cannot be calculated since a high load is imposed on a microcomputer for calculating wheel speed information, data on the wheel speed information cannot be calculated, and therefore, the wheel speed information cannot be captured in 2 bytes.
- wheel speed information that is expressed by the combination of the number of pulses output in proportion to the rotation of a wheel (wheel speed pulses) and a time corresponding to the number of pulses.
- transmission or reception can be performed in the form of data on the wheel speed information illustrated in FIG. 4.
- each of points A and B indicates a timing when the data on the wheel speed information is received.
- An interval of data received at the timing B is equivalent to a period of time T B from the rising-up of a pulse immediately before the point A till the rising-up of a pulse immediately before the point B.
- the number of wheel speed pulses during that period is indicated by N B .
- an interval of data received at the timing A is equivalent to a period of time T A , in which the number of wheel speed pulses is indicated by N A .
- each of the numbers N A and N B of wheel speed pulses is 1-byte data, and each of the corresponding times T A and T B is 2-bytes data.
- the interval for capturing the data on the wheel speed information ranges from 10 ms to 100 ms. This is because it is preferable that the data is captured at an interval within this range in order to prevent any erroneous notice on an easy-to-slip road.
- the data might be captured at an interval from the rising-down of one pulse to the rising-down of the other pulse.
- the wheel speed information is converted into the digital data, which is then captured into the apparatus for alarming the decrease in tire air-pressure via the on-vehicle LAN, thus remarkably reducing the number of lines laid in the vehicle in comparison with the prior art.
- the apparatus for alarming the decrease in tire air-pressure can be mounted wherever it can be connected to the on-vehicle LAN, thus enhancing the freedom of design of an electrical system inside the vehicle to allow the apparatus be mounted in a relatively great space.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Fluid Pressure (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/419,194 US7053760B2 (en) | 2000-09-05 | 2003-04-21 | Apparatus and method for alarming decrease in tire air-pressure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-269050 | 2000-09-05 | ||
JP2000269050A JP3641419B2 (ja) | 2000-09-05 | 2000-09-05 | タイヤ空気圧低下警報装置および方法 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/419,194 Continuation US7053760B2 (en) | 2000-09-05 | 2003-04-21 | Apparatus and method for alarming decrease in tire air-pressure |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020047779A1 true US20020047779A1 (en) | 2002-04-25 |
Family
ID=18755731
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/943,206 Abandoned US20020047779A1 (en) | 2000-09-05 | 2001-08-31 | Apparatus and method for alarming decrease in tire air-pressure |
US10/419,194 Expired - Lifetime US7053760B2 (en) | 2000-09-05 | 2003-04-21 | Apparatus and method for alarming decrease in tire air-pressure |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/419,194 Expired - Lifetime US7053760B2 (en) | 2000-09-05 | 2003-04-21 | Apparatus and method for alarming decrease in tire air-pressure |
Country Status (4)
Country | Link |
---|---|
US (2) | US20020047779A1 (ja) |
EP (1) | EP1184209B1 (ja) |
JP (1) | JP3641419B2 (ja) |
DE (1) | DE60124468T2 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040189457A1 (en) * | 2003-03-31 | 2004-09-30 | Denso Corporation | Tire pneumatic pressure monitoring system |
US8151127B2 (en) | 2000-07-26 | 2012-04-03 | Bridgestone Americas Tire Operations, Llc | System for conserving battery life in a battery operated device |
US8266465B2 (en) | 2000-07-26 | 2012-09-11 | Bridgestone Americas Tire Operation, LLC | System for conserving battery life in a battery operated device |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4159516B2 (ja) * | 2004-06-15 | 2008-10-01 | 住友ゴム工業株式会社 | タイヤ空気圧低下警報装置における減圧判定値の速度感度補正方法の改善 |
JP2006290089A (ja) * | 2005-04-08 | 2006-10-26 | Nissan Motor Co Ltd | 車載通信装置および方法 |
ITAT20090003A1 (it) * | 2009-03-02 | 2010-09-03 | Paser Srl | Unita' elettronica per il controllo della pressione gomme |
CN111511588A (zh) | 2017-12-20 | 2020-08-07 | 尼拉动力公司 | 确定车辆中轮胎压力状态 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9207271D0 (en) * | 1992-04-02 | 1992-05-13 | Sumitomo Rubber Ind | Method of detecting a deflated tyre on a vehicle |
US5591906A (en) | 1992-09-16 | 1997-01-07 | Sumitomo Electric Industries, Ltd. | Tire pressure drop detecting device and method |
JP3268100B2 (ja) | 1993-12-24 | 2002-03-25 | 株式会社東芝 | マルチスクリーンディスプレイ及びその組立方法 |
JPH08244575A (ja) | 1995-03-14 | 1996-09-24 | Sumitomo Rubber Ind Ltd | 車輪速度信号出力のための出力ターミナルおよび延長ハーネス |
US5900543A (en) | 1996-04-15 | 1999-05-04 | Sumitomo Rubber Industries, Ltd | Method for detecting decrease of tire air pressure and apparatus used therefor |
US6014599A (en) * | 1996-08-29 | 2000-01-11 | Denso Corporation | Tire abnormality sensor |
JPH1071818A (ja) * | 1996-08-30 | 1998-03-17 | Sumitomo Electric Ind Ltd | タイヤ空気圧低下検出に用いる車輪速信号の処理装置 |
JP3333691B2 (ja) * | 1996-09-25 | 2002-10-15 | 株式会社日本自動車部品総合研究所 | タイヤ空気圧検知装置 |
JPH1159148A (ja) * | 1997-08-12 | 1999-03-02 | Sumitomo Rubber Ind Ltd | タイヤ空気圧異常警報装置および方法 |
DE19859225A1 (de) * | 1997-12-22 | 1999-07-01 | Aisin Seiki | Verfahren und Vorrichtung zur Erfassung eines Luftdruckes eines Reifens |
US6339957B1 (en) * | 1998-07-09 | 2002-01-22 | Sumitomo Rubber Industries, Ltd. | Apparatus for identifying tires and method thereof |
DE19849390C2 (de) * | 1998-10-27 | 2001-08-30 | Continental Ag | Verfahren zur Durchführung der Zuordnung von Luftdruckkontrollvorrichtungen zu Radpositionen in einem Luftdruckkontrollsystem eines Kraftfahrzeuges |
WO2000059743A1 (de) * | 1999-04-03 | 2000-10-12 | Continental Teves Ag & Co. Ohg | Verfahren zur reifendrucküberwachung und reifendrucküberwachungssystem |
JP3565106B2 (ja) * | 1999-08-30 | 2004-09-15 | 株式会社デンソー | タイヤ空気圧警報装置 |
US6408690B1 (en) * | 2000-06-12 | 2002-06-25 | Cm Automotive Systems Inc. | Tire pressure sensory monitoring system |
-
2000
- 2000-09-05 JP JP2000269050A patent/JP3641419B2/ja not_active Expired - Fee Related
-
2001
- 2001-08-31 US US09/943,206 patent/US20020047779A1/en not_active Abandoned
- 2001-09-03 EP EP01307475A patent/EP1184209B1/en not_active Expired - Lifetime
- 2001-09-03 DE DE60124468T patent/DE60124468T2/de not_active Expired - Lifetime
-
2003
- 2003-04-21 US US10/419,194 patent/US7053760B2/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8151127B2 (en) | 2000-07-26 | 2012-04-03 | Bridgestone Americas Tire Operations, Llc | System for conserving battery life in a battery operated device |
US8266465B2 (en) | 2000-07-26 | 2012-09-11 | Bridgestone Americas Tire Operation, LLC | System for conserving battery life in a battery operated device |
US20040189457A1 (en) * | 2003-03-31 | 2004-09-30 | Denso Corporation | Tire pneumatic pressure monitoring system |
US7075419B2 (en) | 2003-03-31 | 2006-07-11 | Denso Corporation | Tire pneumatic pressure monitoring system |
Also Published As
Publication number | Publication date |
---|---|
EP1184209B1 (en) | 2006-11-15 |
DE60124468T2 (de) | 2007-09-20 |
EP1184209A3 (en) | 2003-10-15 |
JP3641419B2 (ja) | 2005-04-20 |
US20030193391A1 (en) | 2003-10-16 |
US7053760B2 (en) | 2006-05-30 |
DE60124468D1 (de) | 2006-12-28 |
EP1184209A2 (en) | 2002-03-06 |
JP2002067638A (ja) | 2002-03-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SUMITOMO ELECTRIC INDUSTRIES, LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ARITA, MASAKAZU;REEL/FRAME:012142/0608 Effective date: 20010808 Owner name: SUMITOMO RUBBER INDUSTRIES, LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ARITA, MASAKAZU;REEL/FRAME:012142/0608 Effective date: 20010808 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |