CN1990285A - Double-antenna signal reception method in tyre gas pressure observation system - Google Patents
Double-antenna signal reception method in tyre gas pressure observation system Download PDFInfo
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- CN1990285A CN1990285A CN 200510112021 CN200510112021A CN1990285A CN 1990285 A CN1990285 A CN 1990285A CN 200510112021 CN200510112021 CN 200510112021 CN 200510112021 A CN200510112021 A CN 200510112021A CN 1990285 A CN1990285 A CN 1990285A
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Abstract
The invention discloses a dual-antenna signal receiving method of tyre pressure monitoring system, which is characterized by the following: adopting dual-antenna receiving technique; setting two antennas on two sides in the car; displaying level direction for individual directional pattern for two antennas; covering TPMS along synthetic direction; adjusting dual-antenna to optimum receiving condition; guaranteeing completing covering for car and receiving effect of TPMS launcher in four tires.
Description
Technical field
The present invention relates to air pressure of automobile tire monitoring system (being TPMS), relate in particular to the receiving wire technology in this system receiving module.
Background technology
TPMS is the automotive tire pressure supervisory system, i.e. the english abbreviation of " Tire Pressure Monitoring System ".Be mainly used in when running car, in time tire pressure monitored automatically, cause low tire pressure and the high tire pressure runflat of high temperature to carry out early warning, guarantee traffic safety tire flat.
TPMS is made up of emission detection module (one on each tire) and reception display module (): by temperature and pressure transmitter, MCU (micro controller system) and emitter and battery are formed on the emission detection module circuit; Structure is used for the shell of protective circuit by one and the device that shell is fixed on the wheel rim of tire is formed.
On the acceptor circuit by power module, receiver, receiving wire, MCU, display module is formed; Comprise casing on the structure, be located at the functional switch and the read-out of machine shell panel.
The radio environment that TPMS receives and to the requirement that receives antenna technology because the sensitivity of receiver has certain limit, the difference between emissive power and the receiver sensitivity is exactly admissible maximum attenuation, otherwise has not just received data.
Electromagnetic wave propagation mechanism is different, is divided into reflection, diffraction and scattering usually.In addition, owing to the repeatedly reflection from different objects, the electromagnetic wave mutual action in process different length path also can cause the multipath loss, and along with the continuous increase of distance between the transmitter and receiver (being the T-R distance), electromagnetic intensity is also along with decay simultaneously.
Reflection, diffraction and scattering are three kinds of basic mechanism of transmission that influence is propagated in GSM.In the large scale propagation model, can predict received power according to reflection, diffraction and scattering.Small scale decline and multipath propagation also describe by these three kinds of mechanism.
During electromagnetic wave propagation, run into the much bigger object of wavelength, reflect, reflection usually occurs in earth surface, building and wall surface.
When the radio propagation path between the transmitter and receiver was kept off by sharp edge the moon, diffraction took place.The secondaries that is produced by stop surface intersperses among the space, comprises the back side of baffle element.Even there is not apparent distance path between the transmitter and receiver, the bending that yet produces ripple around baffle element.At high band, the same with reflection, the shape that depends on object of diffraction, and incident wave is in amplitude, phase place and the polarization mode of point diffraction.
When radio wave propagation, through comparing very little object group with wavelength, and scattering takes place when very big in the obstacle quantity in the unit volume.Scattered wave results from rough surface, wisp or other irregularly shaped objects.In practical wireless communication systems, leaf, street sign indicator, street lamp cause scattering easily.
To the research of propagation model, concentrate on prediction traditionally to average received field intensity in given the enclosing, and near the variation of the field intensity of ad-hoc location.For the prediction average field-strength and estimate the propagation model of wireless coverage, is that the field intensity on the long distance (several kms of hundreds of rice) changes between emitter and the receiver because their describe, so be called as the large scale propagation model.Describe short range (several wavelength) or short time the propagation model of the rapid fluctuations of the received field strength in (second level), be called the small scale decline.
When transmitter module is mobile in very low range, may cause the express delivery fluctuation of received field strength in moment, promptly be the small scale decline.The reason that causes this phenomenon is that received signal is synthesizing from the different directions signal.Because signal phase is a ccasual, its composite signal variation range is very big, and signal is obeyed Rayleigh fading and distributed.On the downside in small scale, when receiver miles of relative movement was suitable with wavelength, the variation of 3 or 4 orders of magnitude (30dB or 40dB) can take place in its received field strength.When receiver during away from emitter, local average received field intensity weakens gradually, and its average received field intensity is predicted by the large scale propagation model.
The TPMS receiver generally is positioned at car, and emitter is arranged in tire, and because present tire all is a radial-ply tyre, tyre contact patch city metallo-net can only be the tire both sides in the electromagnetic wave propagation path.So for different roads, the radiowave of launching from the tire outside can be through the reflection of external object with directly by passing vehicle window two paths into the car.Reflection through external object is to follow three kinds of basic mechanism of transmission basically.And pass through vehicle window at first just by decay, what follow into the car is the small scale decline, the decay of the radiowave that automobile emits tire everywhere is all different, for the effect that guarantees to receive in all cases, just must make data, and then make the model of the radio attenuation on the car the decay to tire everywhere on the car.In the TPMS system, receiving wire must guarantee that its directional pattern can cover the transmission path of the TPMS emitter of front and back wheel, the directional coefficient of receiving wire guarantees on the main transmission path of TPMS maximum simultaneously, select suitable antenna reception programme, reasonably arrange aerial position, could guarantee reliable and stable reception.
The TPMS receiver has adopted following several modes substantially both at home and abroad at present: the chassis antenna is about to antenna cloth on the chassis of car; The directional pattern of this kind antenna is a horizontal omnidirectional, and this antenna can cover the transmission path of TPMS on the chassis, can guarantee good reception, but owing to be antenna on the chassis, so must connect up onboard, perforating, very trouble is installed.The receiver module built-in aerial is about to antenna and places in the receiver module, and receiver module is placed in the car again; The advantage of this kind antenna is to realize simply, and is easy for installation.But owing to be the decay of vehicle window in car, and the complexity of environment inside car, it is different causing in the car everywhere the decay to the signal of four tires; Again because the directional pattern of this antenna is a horizontal omnidirectional at test cell, but in car, because the various influences in the car, causing directional pattern no longer is omnidirectional, the direction coefficient is very little on some direction, and because the difference of car, directional pattern neither be constant, so can cause the reception of this kind antenna bad, if adjust the position of antenna, tend to attend to one thing and lose sight of another, originally the reception again of reception good is bad, unlikely the reception to four tires is good simultaneously, generally has one to two tire signal and receives bad.
Summary of the invention
Purpose of the present invention is exactly the double-antenna signal reception method that provides in order to overcome the defective that above-mentioned prior art exists in a kind of easy for installation, tire pressure monitoring system that reception is good.
Purpose of the present invention can be achieved through the following technical solutions: the double-antenna signal reception method in the tire pressure monitoring system, this method may further comprise the steps: the sensor in the emission detection module converts the variation of tire pressure to the electric parameter of respective change by the electronic component induction, be treated to digitally encoded signal by micro controller system (MCU) then, add identification identity (ID) coding of this module, be modulated on the carrier frequency by emitter and launch, after radio signal is received by receiver antenna, obtain original data through the receiver module demodulation, after handling through the micro controller system (MCU) that receives display module again, encode the data field of accordingly the tire of data display on user interface according to identification identity (ID) by the telltale that is installed in the operator's compartment, chaufeur just can know clearly the air pressure size in each tire from the telltale, when the tire internal gas pressure value in the information of receiving is lower than or surpasses on the safety that has been provided with, down in limited time, micro controller system (MCU) will be controlled telltale display alarm icon, chaufeur can carry out respective handling to that tire in time according to the tire pressure data in the corresponding orientation that shows; It is characterized in that, described receiver antenna adopts the double antenna technology, two antennas are installed in the both sides in the car respectively, and the independent directional pattern of these two antennas all is a horizontal omnidirectional, and its synthetic directional pattern has covered the main radio transmission path of tire pressure monitoring system (TPMS).
Described double antenna is installed in respectively on the interior A post of car, is connected with three-way connector by the radio frequency coaxial-cable adaptor union then, and this three-way connector is connected with receiver module again.
Described double antenna is whip aerial or helical antenna.
Described identification identity (ID) coding is the identity coding that is used to distinguish other module.
The present invention is owing to be double antenna, exerts an influence on one side only can receive car body the adjustment of one of them antenna, and do not exert an influence for another side, satisfied the complex conditions of automobile, antenna can be adjusted to best reception state; Again because the directional pattern of an antenna has guaranteed that to most covering in the car double antenna then guaranteed the covering fully in the car, thereby guarantee reception to TPMS emitter in four tires.Aspect installation,, therefore not be used in wiring in the car in addition, make easier for installation because two antennas all are installed on the interior A post of car.
Description of drawings
Fig. 1 is a mounting structure scheme drawing of the present invention;
Fig. 2 is the mounting structure scheme drawing of three-way connector of the present invention and receiver module.
The specific embodiment
As Fig. 1, shown in Figure 2, double-antenna signal reception method in a kind of tire pressure monitoring system, this method may further comprise the steps: the sensor in the emission detection module 1 converts the variation of tire pressure to the electric parameter of respective change by the electronic component induction, be treated to digitally encoded signal by micro controller system (MCU) then, add identification identity (ID) coding of this module, be modulated on the carrier frequency by emitter and launch, after radio signal is received by receiver antenna 21, obtain original data through receiver module 2 demodulation, after handling through the micro controller system (MCU) that receives display module 3 again, encode the data field of accordingly the tire of data display on user interface according to identification identity (ID) by the telltale that is installed in the operator's compartment, chaufeur just can know clearly the air pressure size in each tire from the telltale, when the tire internal gas pressure value in the information of receiving is lower than or surpasses on the safety that has been provided with, down in limited time, micro controller system (MCU) will be controlled telltale display alarm icon, chaufeur can carry out respective handling to that tire in time according to the tire pressure data in the corresponding orientation that shows; Described receiver antenna 21 adopts the double antenna technology, two antennas are installed in the both sides in the car respectively, the independent directional pattern of these two antennas all is a horizontal omnidirectional, and its synthetic directional pattern has covered the main radio transmission path of tire pressure monitoring system (TPMS).Described double antenna 21 is installed in respectively on the interior A post of car, is connected with three-way connector 5 by radio frequency coaxial-cable adaptor union 4 then, and this three-way connector 5 is connected with receiver module 2 again.Described double antenna 21 is whip aerial (embodiment 1) or helical antenna (embodiment 2).Described identification identity (ID) coding is the identity coding that is used to distinguish other module.
Claims (4)
1. the double-antenna signal reception method in the tire pressure monitoring system, this method may further comprise the steps: the sensor in the emission detection module converts the variation of tire pressure to the electric parameter of respective change by the electronic component induction, be treated to digitally encoded signal by micro controller system (MCU) then, add identification identity (ID) coding of this module, be modulated on the carrier frequency by emitter and launch, after radio signal is received by receiver antenna, obtain original data through the receiver module demodulation, after handling through the micro controller system (MCU) that receives display module again, encode the data field of accordingly the tire of data display on user interface according to identification identity (ID) by the telltale that is installed in the operator's compartment, chaufeur just can know clearly the air pressure size in each tire from the telltale, when the tire internal gas pressure value in the information of receiving is lower than or surpasses on the safety that has been provided with, down in limited time, micro controller system (MCU) will be controlled telltale display alarm icon, chaufeur can carry out respective handling to that tire in time according to the tire pressure data in the corresponding orientation that shows; It is characterized in that, described receiver antenna adopts the double antenna technology, two antennas are installed in the both sides in the car respectively, and the independent directional pattern of these two antennas all is a horizontal omnidirectional, and its synthetic directional pattern has covered the main radio transmission path of tire pressure monitoring system (TPMS).
2. the double-antenna signal reception method in the tire pressure monitoring system according to claim 1, it is characterized in that, described double antenna is installed in respectively on the interior A post of car, is connected with three-way connector by the radio frequency coaxial-cable adaptor union then, and this three-way connector is connected with receiver module again.
3. the double-antenna signal reception method in the tire pressure monitoring system according to claim 1 and 2 is characterized in that, described double antenna is whip aerial or helical antenna.
4. the double-antenna signal reception method in the tire pressure monitoring system according to claim 1 is characterized in that, described identification identity (ID) coding is the identity coding that is used to distinguish other module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510112021 CN1990285A (en) | 2005-12-27 | 2005-12-27 | Double-antenna signal reception method in tyre gas pressure observation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510112021 CN1990285A (en) | 2005-12-27 | 2005-12-27 | Double-antenna signal reception method in tyre gas pressure observation system |
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| CN1990285A true CN1990285A (en) | 2007-07-04 |
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| CN 200510112021 Pending CN1990285A (en) | 2005-12-27 | 2005-12-27 | Double-antenna signal reception method in tyre gas pressure observation system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102544736A (en) * | 2010-12-08 | 2012-07-04 | 上海保隆汽车科技股份有限公司 | Helical antenna with small reflection surface |
| CN102906937A (en) * | 2010-05-21 | 2013-01-30 | 圭多·莫伊拉吉公司之电子通讯有限合伙公司 | Compacted patch antenna |
| CN102967386A (en) * | 2012-09-29 | 2013-03-13 | 武汉烽火富华电气有限责任公司 | Passive wireless temperature measuring method based on double-antenna channel |
-
2005
- 2005-12-27 CN CN 200510112021 patent/CN1990285A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102906937A (en) * | 2010-05-21 | 2013-01-30 | 圭多·莫伊拉吉公司之电子通讯有限合伙公司 | Compacted patch antenna |
| CN103414025A (en) * | 2010-05-21 | 2013-11-27 | 圭多·莫伊拉吉公司之电子通讯有限合伙公司 | Compacted patch antenna |
| CN102544736A (en) * | 2010-12-08 | 2012-07-04 | 上海保隆汽车科技股份有限公司 | Helical antenna with small reflection surface |
| CN102544736B (en) * | 2010-12-08 | 2016-08-17 | 上海保隆汽车科技股份有限公司 | There is the helical antenna of little reflecting surface |
| CN102967386A (en) * | 2012-09-29 | 2013-03-13 | 武汉烽火富华电气有限责任公司 | Passive wireless temperature measuring method based on double-antenna channel |
| CN102967386B (en) * | 2012-09-29 | 2015-07-29 | 武汉烽火富华电气有限责任公司 | A kind of passive and wireless temp measuring method based on double antenna passage |
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