AU622886B2 - Elements required for exciting and monitoring wheel modules in a monitoring system for vehicle wheels - Google Patents
Elements required for exciting and monitoring wheel modules in a monitoring system for vehicle wheels Download PDFInfo
- Publication number
- AU622886B2 AU622886B2 AU28200/89A AU2820089A AU622886B2 AU 622886 B2 AU622886 B2 AU 622886B2 AU 28200/89 A AU28200/89 A AU 28200/89A AU 2820089 A AU2820089 A AU 2820089A AU 622886 B2 AU622886 B2 AU 622886B2
- Authority
- AU
- Australia
- Prior art keywords
- wheel
- antenna
- vehicle
- inductive coupling
- monitoring
- 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.)
- Ceased
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
- B60C23/0422—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 characterised by the type of signal transmission means
- B60C23/0427—Near field transmission with inductive or capacitive coupling means
-
- 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
- B60C23/0422—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 characterised by the type of signal transmission means
- B60C23/0427—Near field transmission with inductive or capacitive coupling means
- B60C23/043—Near field transmission with inductive or capacitive coupling means using transformer type signal transducers, e.g. rotary transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/083—Means for indicating or recording, e.g. for remote indication electrical
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Description
Pcr O DEMANDE INTERNATIONALE I OPI DATE 19/07/89 APPLN. ID 28200 89 AOJP DATE 17./a9 PCT NUMBER TC/FR88/00612 (51) Classification intertiatiu.,ale des brevets 4 6r ~d pu Iitio i ernkij__iale: WO 89/ 05737 23/04, G0lL 19/08 Al1 (43) Date de publication internationale: 29 juin 1989 (29.06,89) (21) Numniro de Ia demnande internationale: PCT/FR88/00612 (74) Mandataire: BAUVIR, Jacques; Michelin Cie, Ser- (22)Datede dp~t nteratioal:'ice K. Brevets, F-63040 Clermont-Ferrand (FR).
14 d~cembre 1988 (14.12.88) (81) Etats d~sign~s: AT (brevet europ6en), AU, BE (brevet europ~en), BR, CH (brevet europ~en), DE (brevet (31) Numnro de Is dernande prioritaire: 87/17696 europ~en), FR (brevet europ~en), GB (brevet europ~en), IT (brevet europ~en), JP, KR, LU (brevet euro- (32) Date de prioriti: 16 d~cembre 1987 (16.12.87) p~en), NL (brevet europ~en), SE (brevet europ~en), us.
(33) Pays de prioriti:
FR
PubIie (71) Diposant (pour tous les Etats d~sigrjk.-auf US): COM- A vec rapport de recherche internationale.
PAGNIE GENERALE DES ETABLISSEMENTS MICHELIN MICHELIN CIE [FR/FR]; 4, rue du Terrail, F-63000 Clermont-Ferrand (FR).
(72) Inventeur; et Inventeur/D~posant (US seulement) DOSJOUB, Andr6 [FR/FR]; 20 bis, rue Ernest-Renan, F-63400 Chama- Iieres (FR).
(54) Title: ELEMENTS REQUIRED FOR EXCITING AND MONITORING WHEEL MODULES IN A MONITO- RING SYSTEM FOR VEHICLE WHEELS (54)Titre: ELEMENTS NECESSAIRES A L'EXCITATION ET A L'ECOUTE DES MODULES DE ROUE DANS UN SYSTEME DE SURVEILLANCE DES ROUES DULN VEHICULE IV 2 1w 1 R4 A4 2.o (57) Abstract 6 A device for exciting and monitoring wheel m,'vlules for monitoring tyres comprises control lines 6) which excite simultaneously all the wheel modules except one, whit,, is monitored, For this purpose, it comprises one exciting and monitoring assembly per wheel, Each assembly comprises an insulation transformer (20) of which the stcondary (21) has a central point (21 N) connected to earth. This arrangement ensures good electromagnetic compatibility and good insensitivity to radio frequencies.
(57) Abr~gi Le dispositif d'excjtation et d'6coute des modules de roues n~cessaires A Ia surveillance des pnieumnatiques comporte des vojes de commande (5 et 6) pour exciter tous les modules de roue en mi~me temps, sauf une, celle qui est 6cout~e. A cette fin, il comporte un ensemble d'excitation et d'6coute par roue. Chaque ensemble comporte un transformateur d'isolement (20) dont le secondaire (21) a un point milieu (21M) raccord6 A la masse. Cette disposition assure une bonne compatibilit6 6lectromagn~tique et ulie bonne insensibilit6 aux fr6quences radio.
ELEMENTS REQUIRED FOR EXCITING AND MONITORING WHEEL MODULES IN A MONITORING SYSTEM FOR VEHICLE WHEELS The present invention relates to monitoring of vehicle wheels, expecially tyres. In particular, it relates to elements implanted on the vehicle, that is to say, in a fixed space, or more precisely, in a space immobile in rotation.
The invention concerns the elements of those monitoring systems comprising modules implanted on each wheel to be monitored, connections between wheel and fixed space, for example inductively coupled antennas, and, on board the vehicle, elements ensur'ing overall operation of the system for providing a signal which can be operated by the driver, or by any alarm system, whether centralized or not.
The patent W087/00127 proposes coding which allows transmission of the value of pressure and temperature of a tyre from the wheel carrying said tyre to the vehicle itself (fixed space). This coding lends itself to transmission by inductive coupling. The patent W087/00129 describes a method for accumulating and utilizing electrical energy transmitted by means of an alternating
~LI
2 current transmitted in turn by inductive coupling. This kind of device functions according to the following cycle excitation of the module implanted on the wheel by sending an excitation signal, from the vehicle, from which said wheel module will draw the energy necessary for its func-
[I
tioning, then by monitoring the signal received in response to the excitation, on the vehicle. This received signal comprises, by coding, the values of the parameters measured on the wheel. According to the concept proposed by the patent W087/00129, said signal is produced by the wheel module when excitation ceases.
M The aim of the present invention is to propose excitation and monitoring elements for wheel modules which reach the highest possible scrutinizing speed.
Another aim of the present invention is to propose a device which is as insensitive as possible to the electromagnetic environment and to radio frequencies and which does not provoke parasites likely to hamper electrical equipment loaded on the vehicle.
A further aim of the present invention is to propose a device suitable for monitoring the wheel module as fast as possible following excitation.
IL -1 _I I J I 3 Yet another aim of the present invention is to produce an excitation device with a constant performance, irrespective of the supply voltage from the vehicle's battery.
The excitation and monitoring device according to the invention, useable for monitoring of the wheels of a vehicle, said device comprising for each wheel a module able to accumulate electric energy thanks to the transmission of a current by inductive coupling from the vehicle to said wheel, able to code the values of the parameters observed on a wheel, and able to transmit, by inductive coupling, the signal thus coded, an antenna attached coaxially to the wheel being connected to said module, said device being provided to be connected to one inspection antenna per wheel, said inspection antenna being attached to a 1 0 part of the vehicle not moving in rotation so that the inductive coupling with the wheel antenna is approximately constant, is characterised in that it comprises; per wheel, a unit assuring the production of the exciting current and the shaping of the signal received in response to the excitation, i j means of controlling the cycle of "excitation of wheel modules and monitoring of the latter" assuring the successive monitoring of each wheel and, simultaneously with said monitoring of a wheel, the excitation of at least one other wheel module which will be monitored in the following phase cycle, means assuring the processing of the received signal to extract from it said values.
r t, ttitr At A4i V;
I
ttl!
~;LU
o c I tf
C
4 of each wheel and, simultaneously to said wheel monitoring, excitation of at least one o wheel module which will be monitor n the following phase of the cycl mea nsuring treatment of the signal received t c e-xtract said values from it.
The following diagrams further illustrate the invention in a comprehensive manner Figure 1 scheitically represents a device according to the invention.
Figure 2 shows in greater detail a unit incorporated in a device according to the invention.
Figure 3 is a chronogram of a current found in said unit.
Figures 4a, 4b, 4c represent the excitation control.
Figure 1 shows an inspection antenna 1, designed to couple with a wheel antenna (not shown) by electromagnetic coupling. The device comprises a unit 2 for each vehicle wheel. Said unit 2 ensures production of a suitable excitation current, in accordance with the associated wheel module. In the event of a wheel module as per W087/00129, this excitation current is, for L L~ example, an alternating current. Each unit also ensures reception and shaping of the signal sent by the wheel in response to excitation. This signal carries all the coded values of the measureed parameters, such as pressure and temperature of tyres fitted on the wheels. The output signal from each unit 2 is applied to a microprocessor 3 which treats it to extract the decoded values of the parameters measured in the wheel. Decoding is naturally conditioned by the type of coding carried out by the wheel module. These values can be sent to a setter, or to another microprocessor for extra treatment. Then again, they can be the object of other treatment by the same microprocessor. The output 4 incorporates all these possibilities, which are not the object of this invention.
By means of control channels 5 and 6 the microprocessor 3 also controls the functioning of the units 2.
The 'excitation' mode of the units 2 can be either started up or stopped by channel 5. In Figure 1 this is represented by the circuit breakers 51, 52 5n, which, when closed, send an excitation current by the corresponding unit 2, and, when open (as in the circuit breaker on channel let the excitation rest. At this time the corresponding unit 2 is able to monitor the signal received from the wheel. The signal is sent to the microprocessor 3 by the control channel 6 this process L I 6 lasts long enough for decoding to be carried out. Overall control by the microprocessor 3 ensures selection for monitoring of a single wheel at a time it also ensures that during minitoring there is no excitation current on the corresponding unit 2 and that monitoring is selected I immediately after an excitation phase, so that the wheel module can make use of the energy required for it to function. By way of example, simultaneous excitation of all wheels except one (the fifth, as in Figure 1) is assured the exception is the one monitored by the microprocessor for decoding. All wheels are selected successively for monitoring. In this way, necessary excitation of the wheels is carried out in concealed time with respect to the transmission phase for measuring.
Figure 1 shows that each unit 2 comprises an insulation transformer 20 of which the secondary 21 is connected to the inspect 4 .on antenna. Said unit 2 also comprises a central point 21M connected to the vehicle's earth. In this way, the connecting lines 10 between the circuits implanted on board the vehicle and the different inspection antennas 1 may simply consist of an ordinary twin-wire cable. It is unnecessary to resort to a shielded cable, without prejudice to the immunity of the device to parasites. The lines 10 inevitably criss-cross the whole vehicle to connect up the wheels. Therefore they are long Ii i 7 and may touch on other electrical equipment. The central point 21M gives symmetry to the currents or signals passing through the mesh of the circuit comprising said central point, in relation to the earth. With this arrangement the electromagnetic field resulting from two adjacent sources, the two wires required by each line 10, is zero.
Similarly, the common-mode rejection is excellent inside the secondary 21. The result i. excellent electromagnetic compatibility and a highly reduced level of interference with radio frequencies.
Each unit 2 comprises two legs 201, 202 connected in parallel between the supply voltage V and the earth.
Each leg 201,202 is made up of two resistive groups 211,221,212,222- connected in series. Each group has an identical impedance and comprises at least one damping resistance RI. Connected in parallel to said damping resistance is a means forming a circuit breaker, for instance an electronic circuit breaker such as a transistor QI,Q2,Q3,Q4. The terminals of the primary 22 of the transformer 20 are connected to median points M1 and M2 defined as the communal terminal of each of two resistive groups 21X,22X inside each leg The excitation current is determined by the following cycle simultaneous closing of two circuit breakers i
"Y
8 that of the group connected to the supply voltage of one leg group 211 of leg 201 and that of the group connected to the earth of the other leg group 222 of leg 202 that is to say, closing of the means forming the circuit breaker Q1 and Q2. Then inversely by closing of the circuit breakers Q3 and Q4. Figures 4a,4b,4c show the contro,. signal of said circuit breakers positive impulses control closing of circuit breakers Q1 and Q2 for example, while negative impulses control the other circuit i0 breakers. Advantageously, the width of said impulses decreases when the voltage V from the vehicle's battery increases. Figures 4b and 4c show increase in the duration of the impulses when the battery voltage decreases in Srelation to the situation shown by Figure 4a. In this way, the excitation energy can remain substantially constant, irrespective of the voltage from this battery.
Each resistive group preferably comprises a limiting resistance R1 of the current in series with the damping resistance Rl.
Impedances of all the groups are identical. A substantially sinusoidal voltage Vp (according to the value of resistances and inductances) with a continuous component appears at each terminal of the primary, and in relation to the earth. Figure 3 shows the voltage which 9 appears at terminal Ml the time scales in Figures 3, 4a, 4b, 4c correspond. The average value of said voltage Vp is equal to 0.5 multiplied by V, if V is the supply voltage of the unit 2. The voltage appearing at terminal M2 is equal but in antiphase to that at terminal Ml. A substantially sinusoidal alternating current appears between the terminals of the primary 22.
When all circuit breakers are open, excitation ceases and the wheel module immediately sends a coded signal, as proposed by W087/00129. On the other hand, the voltage to which each terminal of the bobbin constituting the primary 22 of the transformer 20 is taken, has a value of 0.5 multiplied by V, that is, precisely the average value prevailing during excitation. The result is very rapid damping of the excitation current, as shown in Figure 3. The advantage of this arrangement is that the unit 20 can monitor very quickly the signal received from the wheel without being disrupted by aftereffects of the excitation phase.
Shaping of the signal received is carried out by the comparator 23 of which the inputs are plugged into the bobbin consitiuting the primary 22. The comparator 23 is connected preferably to said bobbin by means of the polarization resistances Rp, as shown in Figure 2, so -e I that it can screen automatically all parasite signals.
At rest, a potential difference results, applied to the terminals of the comparator, in such a way that it tilts only when the signal received at the terminals of said bobbin is greater than this potential difference. A polarization resistance Rp is introduced into each of the four groups 211,221,212,222 in order to conserve symmetry in the diagram. It stands to reason that at least the resistances serving polarization of the inputs of the comparator 23 must be connected to the median terminals M1 and M2.
The device according to the foregoing description allows interrogation and monitoring of the wheel modules of a monitoring system for tyres which is very reliable, rapid and compatible with the electrical equipment of the vehicle.
Claims (8)
1. An excitation and monitoring device for monitoring the wheels of a vehicle, said device comprising: a module on each wheel for accumulating electric energy from the transmission of electrical current by inductive coupling with the vehicle, for sensing parameters on the wheel, for coding the values of the sensed parameters and for transmitting by inductive coupling a signal including the coded values; a wheel antenna attached coaxially to each wheel and connected to one of said modules; an inspection antenna for each wheel being attached to a non-moving part of the vehicle so that an inductive coupling with the corresponding wheel antenna is :e ~approximately constant; a a unit for each wheel connected to one of said inspection antennas for Sproducing the electrical current transmitted by inductive coupling and for shaping a signal o. received from said inspection antenna which is transmitted from said module through said wheel antenna in response to the electrical current being transmitted; means for controlling said units to be successively actuated so that the wheels a a are successively monitored and so that the monitoring of a first wheel will be simulta. ous with the excitation of a module of another wheel which is to be monitored next; and a means for processing the signal to determine said values of the parameters. Oa as
2. An excitation and monitoring device for monitoring the wheels of a vehicle, said device comprising; a module on each wheel for accumulating electric energy from the transmission of electrical current by inductive coupling with the vehicle, for sensing parameters on the wheel, for coding the values of the observed parameters and for transmitting by inductive coupling a signal including the coded values; a wheel antenna attached coaxially to each wheel and connected to one of said modules; 'IOU ,i 0.i 12 an inspection antenna for each wheel being attached to a non-moving part of the vehicle so that an inductive coupling with the corresponding wheel antenna is approximately constant; a unit for each wheel connected to one of said inspection antennas for producing the electrical current transmitted by inductive coupling and for shaping a signal received from said inspection antenna which is transmitted from said module through said wheel antenna in response to the electrical current being transmitted, said unit comprising i an isolating transformer whose secondary is connected to one inspection antenna and having a middle point connected to ground; means for controlling said units to be successively actuated so that the wheels are successively monitored; and means for processing the signal to determine said values of the parameters.
3. An excitation and monitoring device for monitoring the wheels of a vehicle, said device comprising; a module on each wheel for accumulating electric energy from the transmission of electrical current by inductive coupling with the vehicle, for sensing parameters on the wheel for coding the values of the observed parameters and for transmitting by inductive coupling a signal including the coded values; a wheel antenna attached coaxially to each wheel and connected to one of said modules; an inspection antenna for each wheel being attached to a non-moving part of the vehicle so that an inductive coupling with the corresponding wheel antenna is approximately constant; a unit for each wheel connected to one of said inspection antennas for producing the electrical current transmitted by Inductive coupling and for shaping a signal received from said inspection antenna which is transmitted from said module through said wheel antenna in response to the current being transmitted, said units comprising two branches each having two resistive groups connected in series, said two branches being connected in parallel between a supply voltage and ground, each group having an identical t Impedance, each group comprising at least one diminishing resistance connected In parallel ,1, 1 L- I k 13 wi;th a circuit breaker-forming means, the terminals of the inspection antenna being connected between the two groups of each branch to a middle terminal thereof, said current being produced by simultaneously closing the circuit breaker-forming means of the group connected to the supply voltage of one branch and the circuit breaker-rorming means of the group connected to the ground of the other branch and shaping the received signal with a comparator connected to said middle terminals; means for controlling said units to be successively actuated so that the wheels are successively monitored; and means for processing the signal to determine said values of the parameters.
4. Device according to claim 3, wherein said unit further comprises an oo isolating transformer (20) whose secondary connected to said inspection antenna comprises a middle point (21M) connected to the ground of the vehicle, and whose 1S primary is connected to said middle terminals of each of the two groups. el
5. Device according to claim 3, wherein each group further comprises a limitation resistance R 2 in series with the other resistances of the group. S6. Device according to claim 4, wherein each group further comprises a S. S It
6. Device according to claim 4, wherein each group further comprises a S1 polarisation resistance FRp in series with the other resistances of the group, the comparator for shaping the signal being connected to the primary via said polarisation resistance of the SS.. group connected to the supply voltage of one branch and via said polarisation resistance of S the group connected to the ground of the other branch.
7. Device according to any one of claims, 4, 5 or 6, wherein the circuit breaker- forming means are controlled by a pulse signal the width of said pulses depending inversely on the voltage of the battery of the vehicle, so that the excitation energy remains approximately constant when the voltage of the battery of the vehicle varies. L 119~11~111 1 1 1 14
8. Device according to claim 1, 2 or 3, substantially as herein described with reference to the accompanying drawings. DATED this 17th day of January 1992. COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN MICHELIN CIE WATERMARK PATENT TRADEMARK ATTORNEYS THE ATRIUM 290 BURWOOD ROAD HAWTHORN VICTORIA 3122 AUSTRAUA 4l I I
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8717696A FR2624801B1 (en) | 1987-12-16 | 1987-12-16 | ELEMENTS REQUIRED FOR EXCITTING AND LISTENING TO WHEEL MODULES IN A VEHICLE WHEEL MONITORING SYSTEM |
| FR8717696 | 1987-12-16 | ||
| PCT/FR1988/000612 WO1989005737A1 (en) | 1987-12-16 | 1988-12-14 | Elements required for exciting and monitoring wheel modules in a monitoring system for vehicle wheels |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2820089A AU2820089A (en) | 1989-07-19 |
| AU622886B2 true AU622886B2 (en) | 1992-04-30 |
Family
ID=26226391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU28200/89A Ceased AU622886B2 (en) | 1987-12-16 | 1988-12-14 | Elements required for exciting and monitoring wheel modules in a monitoring system for vehicle wheels |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU622886B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114193982B (en) * | 2021-12-28 | 2024-05-24 | 知轮(杭州)科技有限公司 | Identification structure and positioning method of trailer tire sensor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4467641A (en) * | 1980-12-29 | 1984-08-28 | Precision Mechanique Labinal | Device for measuring a parameter on a rotary element, and in particular for measuring the pressure of a pneumatic tire on a wheel |
| US4567459A (en) * | 1980-08-05 | 1986-01-28 | Bayerische Motoren Werke Aktiengesellschaft | Transmission method for variable measured values from vehicle wheels utilizing ambient temperature compensation |
| WO1987000127A1 (en) * | 1985-07-03 | 1987-01-15 | Michelin & Cie (Compagnie Generale Des Etablisseme | Circuit for coding the value of two magnitudes measured in a tire, and device for monitoring tires by using said circuit |
-
1988
- 1988-12-14 AU AU28200/89A patent/AU622886B2/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4567459A (en) * | 1980-08-05 | 1986-01-28 | Bayerische Motoren Werke Aktiengesellschaft | Transmission method for variable measured values from vehicle wheels utilizing ambient temperature compensation |
| US4467641A (en) * | 1980-12-29 | 1984-08-28 | Precision Mechanique Labinal | Device for measuring a parameter on a rotary element, and in particular for measuring the pressure of a pneumatic tire on a wheel |
| WO1987000127A1 (en) * | 1985-07-03 | 1987-01-15 | Michelin & Cie (Compagnie Generale Des Etablisseme | Circuit for coding the value of two magnitudes measured in a tire, and device for monitoring tires by using said circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2820089A (en) | 1989-07-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6169480B1 (en) | Device for measuring vehicle tire pressure | |
| CA1220820A (en) | Metering system for measuring parameters of high ac electric energy flowing in an electric conductor | |
| JPH0327959B2 (en) | ||
| EP0288998A3 (en) | Self-powered electrical measuring system isolated from electrical perturbances | |
| US5029468A (en) | Elements necessary for the excitation and the monitoring of wheel modules in a system for monitoring the wheels of a vehicle | |
| JP2001516450A (en) | Apparatus for detecting the discharge of a test object, preferably a cable joint | |
| AU622886B2 (en) | Elements required for exciting and monitoring wheel modules in a monitoring system for vehicle wheels | |
| CN110562293B (en) | Safe rail transit axle counting system and method based on edge filtering | |
| CN109159798A (en) | A method of with track-circuit signalling cable transmission axle-counting signal | |
| JPH05107134A (en) | Tire pressure warning device | |
| CN203644153U (en) | Sound magnetic detection system | |
| US4553135A (en) | Electromagnetic field perimeter detection apparatus | |
| US20220334287A1 (en) | Detection Coil Structure Based on Interlayer Coupling and Metal Object Detection System | |
| CN220189094U (en) | Traffic information acquisition device with multiple sensors integrated | |
| CN202770554U (en) | Multi-point series optical fiber point-mode temperature measuring system | |
| RU2000120837A (en) | SIGNAL TRANSMISSION SYSTEM FOR THE ELECTRICAL SUPPLY LINE FOR DETECTION OF ICED DEPOSITS ON WIRES | |
| CN216560637U (en) | Wireless wheel sensor | |
| CN214096255U (en) | Novel microwave level switch sensor system | |
| Wang et al. | Application of fiber optic information-transferring technology to industrial automation | |
| CN212063638U (en) | Foreign matter detection device of wireless charging system | |
| CN113306417B (en) | Data acquisition system and method for wireless charging foreign matter detection | |
| CN218068305U (en) | Metal detecting device | |
| CN201984598U (en) | Power line carrier multi-signal safety alarm system based on human body infrared sensing technology | |
| JPH0531008Y2 (en) | ||
| RU97106081A (en) | SYSTEM FOR DETERMINING DAMAGED SECTIONS OF ELECTRIC NETWORKS |