WO1998034799A1 - Tyre pressure warning system - Google Patents
Tyre pressure warning system Download PDFInfo
- Publication number
- WO1998034799A1 WO1998034799A1 PCT/GB1998/000358 GB9800358W WO9834799A1 WO 1998034799 A1 WO1998034799 A1 WO 1998034799A1 GB 9800358 W GB9800358 W GB 9800358W WO 9834799 A1 WO9834799 A1 WO 9834799A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- tyre
- pressure
- transmitter
- signal
- Prior art date
Links
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
Definitions
- This invention relates to a tyre pressure warning system of the type which can be used on vehicles to advise the driver if the pressure in any of the tyres on the wheels of the vehicle changes from a predetermined value by more than a given amount. Typically, it will be used to warn the driver of deflation of the tyre.
- the present invention is an improvement on a system known as TireMate which has been sold in the United States.
- TireMate which has been sold in the United States.
- This consists of a pressure sensor/transmitter, which replaces the dust cap on the outer end of a tyre valve.
- the sensor/transmitter is a mechanical pressure sensor. It is preset with a reference pressure, the ideal pressure for the tyre on which it is to be mounted, and a triggering pressure. If the pressure in the tyre falls to the triggering pressure the sensor/transmitter transmits only its identity to a control unit which then indicates to the driver that a fault has occurred on that. Thus, when the pressure in the tyre becomes too low the driver will be warned of this and will have the option of doing something about it. The sensor/transmitter unit transmits continuously until the battery powering it is discharged.
- sensor/transmitter units have to be preset with desired and triggering pressures. This is normally done at manufacture and means that units cannot easily be switched to other vehicles with tyres that run at different pressures .
- a preferred embodiment of the invention provides a system in which the sensor/transmitter only transmits an over or under pressure signal to the data processing and display unit when the pressure in the tyre differs from the desired pressure by more than a predetermined amount.
- a sensor/transmitter device is provided to replace a standard dust cap.
- a thermistor is provided and is exposed to the gas filling the tyre and thus is sensitive to temperature changes in the gas.
- a software driven microprocessor receives a signal from the thermistor and is thus able to take account of temperature changes in determining whether or not there has been any increase or decrease in the real pressure in the tyre.
- Figure 1 shows a schematic diagram of a system embodying the invention
- Figure 2 shows a schematic diagram of a sensor embodying the invention.
- Figure 3 shows a schematic diagram of a further embodiment of the invention for use on vehicles with detachable trailers.
- FIG 1 there are shown four sensor units 2 each coupled to a respective transmitter 4. These units are included in a unit which screws onto a tyre valve and replaces its dust cap. On a four-wheel vehicle the system would be as shown in Figure 1 with four sensor/transmitter units, one attached to the dust cap on each wheel. It can however be used on two wheel vehicles or vehicles with more than four tyres or wheels.
- the pressure transducers used in the sensor/transmitter units are electronic sensors under microprocessor control. They are controlled to transmit to a control unit an identification code when they are installed on a tyre. They are also controlled to measure and record the pressure they first encounter when they are installed on a tyre. This is stored in memory and is used for comparison with the tyre pressure during use to determine wether the tyre pressure has changed by more than a predetermined amount . Preferably this change is monitored as a percentage of the first encountered pressure, e.g. 15%.
- the transducers used preferably have a range from 0.5 to 10 bar and this enables the same sensor/transmitter units to be used on a wide range of vehicles .
- a data processing unit 6 is provided in the cab of the vehicle in a position where it can be viewed by the driver.
- This data processing unit is coupled to a receiver 8 which receives signals transmitted by the transmitters 4. It is also coupled to a display 10 which is used to display tyre deflation/inflation warning information to the driver.
- the display 10 is preferably an alphanumeric display of, for example, the liquid crystal type. Thus it can provide instructions and information to the user.
- the sensors are coupled to the microprocessor which monitors the output signal from its respective sensor and, if the signal alters in such a way as to indicate that the pressure in the respective tyre has changed from the first encountered pressure by more than the predetermined amount, the processor controls the transmitter to transmit a warning signal to the data processing unit 6 which receives it by means of receiver 8.
- This warning signal comprises an identification signal identifying the sensor.
- the identification signal is a 16-bit coded signal which enables over 65,000 different sensor identification codes to be used. This makes the chance of a signal from a sensor with a corresponding ID on another vehicle being sent to the data processing unit 6 very remote. Previous systems such as the TireMate system included the possibility of only 14 individual settings for sensor identification codes.
- the sensor/transmitter units are arranged to transmit every 24 hours an OK signal to the data processing unit 6 if no fault condition is detected within a 24 hour period.
- the purpose of this signal is to ensure that the data processing unit has information indicating that all sensor/transmitter units on a vehicle are working. Thus, if a fault develops on a unit or its battery runs out of power, no OK signal will be sent to the data processing unit 6 and this can then indicate to the driver via the display 10 that there is a problem with the sensor/transmitter unit on a particular wheel of the vehicle.
- the sensor/transmitter is preferably arranged to detect faults with the sensor and to transmit to the control unit a sensor fault signal to the driver indicating that a problem has occurred with a particular sensor .
- the sensor units are designed to determine the pressure of the tyres on which they are installed, store this pressure in memory and, subsequently, trigger a fault condition transmission when the pressure change within the tyre is, for example, plus or minus 15% from the pressure originally measured and stored. Thus, there is no requirement for triggering of fault condition signals at predetermined pressures.
- the sensor/transmitter in this embodiment sends the fault signal repeatedly over a period of 30 seconds. The transmission is then terminated to save the battery life of the sensor. Thereafter, the alarm transmission is repeated every 15 minutes for a 30 second period. To rectify a fault the sensor/transmitter unit is removed from the tyre by unscrewing the dust cap . Exposure of the transducer to atmospheric pressure causes the sensor to reset and causes the fault transmission to cease. These timings can of course be varied as desired.
- Figure 2 Another embodiment of a sensor/transmitter unit is shown in Figure 2.
- the senor comprises a sensor unit 2 (preferably an electronic sensor) which is responsive to the tyre pressure and a thermistor 12 (temperature dependent resistor) which changes resistance as the temperature in the tyre changes.
- the processor 14 monitors the signal from the sensor 2 and from the thermistor 12. From this, it is able to determine what temperature increase or decrease in the tyre has occurred and thus is able to compensate the signal from the sensor for this temperature increase/decrease. This avoids the sending of a spurious fault condition signal when pressure increases or decreases purely because of a large change in temperature. It ensures that fault transmissions only occur when there is some other cause for an increase/decrease in pressure.
- the data processing and display unit is used to record the identities of sensor/transmitter units installed on a vehicle. This information is stored in memory.
- the control unit prompts a person installing the sensor/transmitter units to install the units on each tyre in turn. Prompting is done via the display 10 where an indication of the tyre on which the next unit to be installed is made.
- the initial exposure to the tyre pressure causes it to transmit its identification code to the control unit.
- the control unit is able to record the identification code for the unit installed on each tyre.
- the data processing unit validates any transmission received by ensuring that it is repeated several times in the same format. This it does during the transmission period of 30 seconds from a fault condition being detected and transmission of that commencing. This is done to exclude spurious transmissions and to ensure that the identity code received relates to a sensor which has previously been recorded as being installed on the particular vehicle.
- tractor and trailer units are used, particularly in the road haulage industry. Trailers may be disconnected from tractors for a considerable period of time and may in fact be reconnected to different tractors. If a tyre deflation should take place whilst a trailer is disconnected, the tractor unit with the standard data processing and display unit will not be in the proximity and, thus, details of the failure will not be stored.
- a separate data transceiver unit is provided on a trailer. This is illustrated in Figure 3.
- a data transceiver unit 16 is provided mounted on a trailer and is coupled to a receiver 18. This receives signals from sensors/transmitters mounted on the wheels of the trailer.
- a separate power supply is included in the data transceiver unit 16 and this is preferably a rechargeable battery which is recharged when the transceiver is connected to the power supply of a tractor.
- a connector 20 is used to couple the data processing unit to the data transceiver when the tractor unit is coupled to the trailer for power supply. On initial coupling, all data stored by the data transceiver is down loaded to the tractor unit. This comprises the identities and locations of the sensors mounted on the trailer, whether or not any fault condition has occurred on any of these, and details of whether the OK signals required every 24 hours have been received.
- the connection 20 between the data transceiver 16 and the data processing unit 6 need not be a hard-wired connection.
- the data transceiver could be provided with a transmitter 22 which, when a tractor is linked to the trailer, could be organised to transmit all the relevant information to a receiver 24 on the data processing unit 6. Thereafter, signals from the trailer sensor transmitters could be received either by the data transceiver 16 or by the data processing unit 6. Using this arrangement enables tractors and trailers to be interchanged without having to reprogramme the tyre pressure warning system.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98903139A EP0958154A1 (en) | 1997-02-05 | 1998-02-05 | Tyre pressure warning system |
CA002280521A CA2280521A1 (en) | 1997-02-05 | 1998-02-05 | Tyre pressure warning system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9702295.8A GB9702295D0 (en) | 1997-02-05 | 1997-02-05 | Tyre pressure warning system |
GB9702295.8 | 1997-02-05 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/106,548 Continuation US6164007A (en) | 1994-02-22 | 1998-06-29 | Fish hook |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998034799A1 true WO1998034799A1 (en) | 1998-08-13 |
Family
ID=10807092
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1998/000358 WO1998034799A1 (en) | 1997-02-05 | 1998-02-05 | Tyre pressure warning system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0958154A1 (en) |
CA (1) | CA2280521A1 (en) |
GB (1) | GB9702295D0 (en) |
WO (1) | WO1998034799A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2386952A (en) * | 2002-03-27 | 2003-10-01 | Mitutoyo Corp | Tyre pressure gauge and measuring system having wireless data transmission |
EP1162088A3 (en) * | 2000-06-09 | 2003-10-15 | Honda Giken Kogyo Kabushiki Kaisha | Apparatus for detecting tire air pressure for motor vehicle |
GB2415048A (en) * | 2004-06-07 | 2005-12-14 | Lear Corp | Trailer tyre pressure monitoring |
GB2447731A (en) * | 2007-03-20 | 2008-09-24 | Ford Global Tech Llc | Wireless Vehicle Communication |
CN100445112C (en) * | 2002-07-24 | 2008-12-24 | 株式会社电装 | Method and system for depositing tyre pressure detector mark |
EP2272689A3 (en) * | 2000-07-26 | 2011-03-09 | Bridgestone Americas Tire Operations, LLC | Electronic tire management system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4303591A1 (en) * | 1993-02-08 | 1994-08-11 | Rainer Achterholt | Valve cap with a device for generating a pressure indication signal for a vehicle tire equipped with a valve |
WO1994020317A1 (en) * | 1993-03-11 | 1994-09-15 | Schrader Automotive Inc. | Remote tire pressure monitoring system employing coded tire identification and radio frequency transmission, and enabling recalibration upon tire rotation or replacement |
WO1996006747A2 (en) * | 1994-08-31 | 1996-03-07 | Otter Controls Limited | A tyre condition monitoring system |
DE19522486A1 (en) * | 1995-06-21 | 1997-01-09 | Duerrwaechter E Dr Doduco | Method for operating a device for monitoring and wireless signaling of a pressure change in pneumatic tires on vehicles |
-
1997
- 1997-02-05 GB GBGB9702295.8A patent/GB9702295D0/en active Pending
-
1998
- 1998-02-05 EP EP98903139A patent/EP0958154A1/en not_active Withdrawn
- 1998-02-05 CA CA002280521A patent/CA2280521A1/en not_active Abandoned
- 1998-02-05 WO PCT/GB1998/000358 patent/WO1998034799A1/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4303591A1 (en) * | 1993-02-08 | 1994-08-11 | Rainer Achterholt | Valve cap with a device for generating a pressure indication signal for a vehicle tire equipped with a valve |
WO1994020317A1 (en) * | 1993-03-11 | 1994-09-15 | Schrader Automotive Inc. | Remote tire pressure monitoring system employing coded tire identification and radio frequency transmission, and enabling recalibration upon tire rotation or replacement |
WO1996006747A2 (en) * | 1994-08-31 | 1996-03-07 | Otter Controls Limited | A tyre condition monitoring system |
DE19522486A1 (en) * | 1995-06-21 | 1997-01-09 | Duerrwaechter E Dr Doduco | Method for operating a device for monitoring and wireless signaling of a pressure change in pneumatic tires on vehicles |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1162088A3 (en) * | 2000-06-09 | 2003-10-15 | Honda Giken Kogyo Kabushiki Kaisha | Apparatus for detecting tire air pressure for motor vehicle |
EP2272689A3 (en) * | 2000-07-26 | 2011-03-09 | Bridgestone Americas Tire Operations, LLC | Electronic tire management system |
GB2386952A (en) * | 2002-03-27 | 2003-10-01 | Mitutoyo Corp | Tyre pressure gauge and measuring system having wireless data transmission |
GB2386952B (en) * | 2002-03-27 | 2005-09-07 | Mitutoyo Corp | Pressure gauge and pressure measuring system |
CN100445112C (en) * | 2002-07-24 | 2008-12-24 | 株式会社电装 | Method and system for depositing tyre pressure detector mark |
GB2415048A (en) * | 2004-06-07 | 2005-12-14 | Lear Corp | Trailer tyre pressure monitoring |
GB2447731A (en) * | 2007-03-20 | 2008-09-24 | Ford Global Tech Llc | Wireless Vehicle Communication |
Also Published As
Publication number | Publication date |
---|---|
CA2280521A1 (en) | 1998-08-13 |
EP0958154A1 (en) | 1999-11-24 |
GB9702295D0 (en) | 1997-03-26 |
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