The present invention requires to be proposed by the applicant; The applying date is on September 8th, 2011; Application number is 201110265406.9, and denomination of invention is the preceence of the application of " inner tube of vehicle tyre and tire pressure monitoring system thereof and device ", and the full content of this application is quoted through integral body and is incorporated into this.
Background technology
Have data to show, the traffic accident that causes by blowing out shared ratio in pernicious traffic accident is very high, and all can cause in the factor of blowing out tire pressure deficiency or tire pressure too high when being first cause.The tire pressure deficiency can cause the tire temperature to raise rapidly and the bead wire door curtain made of cloth damages very soon; And when tire pressure is too high, can reduce tire and ground-surface area of contact, and the pressure that this moment, tire bore improves relatively; The earth-grasping force of tire can be affected, thereby constitutes potential safety hazard.In addition, when vehicle passes through ditch or jolts the road surface, do not have enough spaces absorbing vibration in the tire, except stability and travelling comfort that influence is gone, also can cause impact to put more effort, can bring harm thus yet suspension.The hidden danger of when high temperature, blowing out simultaneously, also can increase accordingly.Therefore, the tire pressure to vehicle in vehicle traveling process carries out real-time automatic monitoring, is the important means that guarantees traffic safety.
From finding, tire pressure monitoring system (TPMS, Tire Pressure Monitoring System) only is equipped with on the part compact car at present.Roughly comprise two kinds of forms: a kind of is the indirect type tire pressure monitoring system, is to judge that through the speed discrepancy of tire whether pressure of tire is unusual, seldom uses; Another kind is the direct-type tire pressure monitoring system; Through install the tire pressure monitoring and sensing device additional in inside tires; In vehicle stationary or driving process, pressure of tire is carried out real-time automatic monitoring; And, avoid because of tire pressure causes traffic accident unusually, to guarantee traffic safety to tire superpressure, the under-voltage warning.
The direct-type system for monitoring pressure in tyre is to utilize the pressure sensor that is installed in the tire to come the tire pressure of drawings; Utilize wireless launcher that pressure information is sent on the central receiver module from inside tires, central receiver module is handled, is judged and show the pressure of tire data.When tire superpressure occurs or when under-voltage, system will the alarm car owner, so direct-type TPMS belongs to active TPMS, is the main flow direction of present compact car tire pressure monitoring system.
A kind of tire pressure monitoring system has been installed on the part compact car; As depicted in figs. 1 and 2, this tire pressure monitoring system comprises TPMS tire inner module and TPMS central module, and TPMS tire inner module is installed in the inner tube of a tyre to be measured of vehicle; A TPMS tire inner module is installed in each carcass; Usually TPMS tire inner module dual mode is installed, utilize tire tube valve to install and utilize the lock ring button to be installed on the wheel hub, no matter adopt which kind of mode; The tire inner module all will be installed in the liner plate back in the wheel cowl, and needs special-purpose dove-tail form emitting antenna to carry out signal transmitting and receiving.TPMS tire inner module generally comprises pressure sensor, temperature sensor, microcontroller and RF receiving and transmission module; These sensors carry out real-time automatic monitoring to inner tube of a tyre tire pressure, temperature in vehicle stationary or driving process; And inner tube of a tyre high pressure, low pressure, high temperature reported to the police; In order to reach purpose of power saving, the tire pressure monitoring system that has has also installed acceleration pick-up additional or has waken chip up.And TPMS central authorities receiver module inserts in the operator's compartment of vehicle usually, and it comprises RF receiving and transmission module, microcontroller, alarm module, and what have has also designed the communication interface with PC.After the alerting signal that TPMS tire inner module produces is launched through its first RF receiving and transmission module; First RF receiving and transmission module by TPMS central authorities receiver module captures; And inner tube of a tyre high pressure, low pressure, high temperature reported to the police; Alerting signal is output demonstration on display module after TPMS central authorities receiver module is handled, thereby reminds the state of the current inner tube of a tyre of chaufeur.And the startup of TPMS tire inner module with close and can control by the TPMS central module.Present dolly TPMS system generally is equipped with 5 tire inner modules (containing a spare tyre) and a central receiver module,
Yet above-mentioned tire pressure monitoring system is for reducing power consumption, need be TPMS tire inner module outside acceleration pick-up with wake chip up, make the system cost increase.
Along with compact car popularizing with vacuum tyre; Oversize vehicle, heavy tire for vehicles are also gradually adopting vacuum tyre, but Oversize vehicle, heavy goods vehicles the problem of blowing out often occurs because of reasons such as its load weight, tire pressure height; And be difficult to control in the back that occurs blowing out and remedy; Not only jeopardize this car personal security, other vehicle of entail dangers to and pedestrian's safety more is if manned motorcoach; That consequence is hardly imaginable especially, so Oversize vehicle, heavy goods vehicles are with the development of vacuum tyre tire pressure monitoring system and device be equipped with most important, extremely urgent.
The tire pressure monitoring system that compact car is adopted is applied on the vacuum tyre of Oversize vehicle, heavy goods vehicles employing, also has following significant deficiency:
1, the tire of full size vehicle is more, does not wait from 8 to 30, and the monitor data of gathering from each vacuum tyre needs higher processing speed and transmission efficiency far more than compact car;
2, the car body of full size vehicle is longer, and roomy, semi-mounted lorry especially, and vehicle body is longer, and the metal car body can the block signal transmission in the transmission of wireless signals process, even produces reflection, causes signal to disturb;
3, the tire of Oversize vehicle distributes and disperses; About 1.5 to 2.5 meters of central processing module and nearest tire pressure monitoring module distance; With about 30 to 40 meters of farthest tire pressure monitoring module distance, need the tire pressure monitoring module to improve emissive power, but the consumption of current of module is increased;
4, the communication antenna of existing tire pressure monitoring module is suitable for small-sized car body, and high directivity receives to produce signal shielding than the blocking of long vehicle body easily, causes dropout.
Summary of the invention
The purpose of this invention is to provide a kind of tire tube valve that is used to communicate by letter, solve the insecure technical matters of transmitting/receiving wireless electric signal in the tire pressure monitoring system.
Another object of the present invention provides a kind of tire pressure monitoring system that utilizes aforementioned tire tube valve as communication antenna, solves the effective problems of monitoring of the tire pressure in the high capacity waggon tire.
The tire tube valve that is used to communicate by letter of the present invention comprises the tire tube valve body, and wherein: the signal output feeder line of wireless transmitter module is connected with the afterbody of tire tube valve body.
Described connection is carried out through connector; One end of said connector engages with said output feeder; The other end of said connector engages with said tire tube valve body afterbody, and said connector is provided with first through hole, and first through hole of said connector is communicated with the cavity of tire tube valve body.
The cavity of said tire tube valve body connects the two ends of said tire tube valve body, and an end of cavity is connected with first through hole on the connector.
The cavity of said tire tube valve body connects an end of said tire tube valve body, has second through hole on the cavity cavity, and second through hole on the cavity cavity is connected with first through hole on the connector.
Said connector comprises pipe and permanent seat, captives joint with the left side of permanent seat in the right side of pipe, on permanent seat, is provided with first through hole that runs through left and right end face, and the inner chamber of first through hole and pipe connects.
Be processed with outside thread on the excircle of said pipe, an end inwall of the cavity of said tire tube valve body is processed with negative thread, or second through-hole wall on the cavity cavity of said tire tube valve body is processed with negative thread.
Said pipe is connected through flush fit with an end of the cavity of said tire tube valve body, or second through hole on the cavity cavity of said pipe and said tire tube valve body is connected through flush fit.
Said first through hole be shaped as yi word pattern, or criss-cross, or hexagon.
The tire pressure monitoring system of the tire tube valve that utilization is used to communicate by letter; Comprise several tire pressure monitoring module and Central Control Module (CCM)s; The tire pressure monitoring module comprises sensor, collection microprocessor, the radiofrequency launcher that is linked in sequence; Central Control Module (CCM) comprises RF receiving and transmission module, microcontroller, display module and the alarm module that is linked in sequence; Wherein: also comprise power amplifier, antenna matching network, as the tire tube valve of communication antenna, as the tire tube valve of dual-mode antenna; Radiofrequency launcher is linked in sequence and is connected the tire tube valve as communication antenna behind power amplifier and the antenna matching network, connects RF receiving and transmission module after connecting antenna matching network as the tire tube valve of dual-mode antenna.
The circuit structure of said tire pressure monitoring module is following: first electric capacity parallel connection, first inductance coil; The two ends of first inductance coil connect the pin 15 and pin 14 of integration module respectively; One end of crystal oscillator connects the pin 4 of integration module; The other end is connected and is connected the pin 3 of integration module behind the 3rd electric capacity, ground connection behind pin 3 series connection the 3rd electric capacity of integration module, second electric capacity; The pin 5 of integration module, pin 9 and pin 17 ground connection, ground connection behind pin 8 series connection the 4th electric capacity; The pin 10 of integration module is connected battery supply with pin 16, and the pin 18 of integration module is connected with pin 2 with the pin 1 that pin 11 is connected to line debugging interface module, pin 4 ground connection of on-line debugging interface module, and pin 3 connects battery supply; The pin 4 that connects power amplifier behind pin 3 series connection the 5th inductance coil of on-line debugging interface module; The 5th electric capacity one end connects the 5th inductance coil, other end ground connection, and the 6th electric capacity one end connects the 5th inductance coil, other end ground connection; The pin 2 and pin 5 ground connection of power amplifier; Second inductance coil and the 3rd inductance coil that connect parallel connection behind pin 1 series connection the 7th electric capacity of power amplifier; Second inductance coil connects the pin 7 of pin 6, the three inductance coils connection integration module of integration module; The 31 electric capacity one end ground connection, other end pin 3, the 32 electric capacity that connect power amplifier behind first resistance of connecting are parallelly connected with the 31 electric capacity, the pin 3 of the 8th electric capacity one end connection power amplifier, other end ground connection; The 9th electric capacity, the tenth electric capacity, the 11 electric capacity and the 4th inductance coil are formed antenna matching network; The two ends of the 4th inductance coil connect the tenth electric capacity and the 11 electric capacity respectively; The tenth electric capacity and the 11 electric capacity parallel connection ground connection; The connect other end of pin 4, the four inductance coils that connect power amplifier behind the 9th electric capacity of one end of the 4th inductance coil connects the connector as the tire tube valve of communication antenna.
The tire tube valve that is used to communicate by letter of the present invention can effectively promote the Applicable scope of tire pressure monitoring warning as the communication antenna of vacuum tyre and inner tube tyre.Tire tube valve of the present invention is in the outside of tire carcass and wheel rim as communication antenna; The metal wool of having avoided being used in the tire construction reinforcing, metal cord are to the shielding to wireless signal of the shielding of wireless signal and wheel rim; Can effectively reduce the emissive power of tire pressure monitoring module; Reduce power consumption, prolong the service life of battery supply.On the other hand, communication antenna is in the tire carcass outside, helps improving the intensity of wireless signal, when tire pressure monitoring module emissive power is identical, realizes longer-distance radio communication more easily, improves data transmission rate, reduces the bit error ratio.Communication antenna of the present invention can effectively be avoided large-scale car body blocking wireless signal transmission paths as omnidirectional antenna.
Between wireless signal output feeder and tire tube valve body, connector is set among the present invention; Making tire tube valve in as communication antenna, pass in and out the gas passage can not blocked; Can not influence the speed that tire charges and discharge gas, can guarantee that the signal output feeder line is connected with the reliable of communication antenna simultaneously.The while connector can be used for the tire pressure monitoring module after the fixing moulding material package, or is fixed on the terminal seal adaptor of communication antenna through connector, avoids destroying the leak tightness of seal adaptor.To passing through the reasonable setting to connector, employing is threaded or the flush fit connection can make communication antenna size and fixed angle be easy to adjustment.Adopt the connector of solid shape and size can make antenna and RF receiving/transmission device more be prone to realize impedance match, avoided mode direct connection tire tube valve such as employing welding to cause the reduction of signal emission efficiency.The shape of first through hole can be mated with existing service tools commonly used, is easy to make tire tube valve, signal output feeder line and connector strength joint.
Pressure of tire monitoring system of the present invention can be suitable for various large-scale, the heavy-duty vehicle with numerous load tires; Has fast operation; The installation site restriction is little, the many characteristics of detection target tire quantity, also can be applicable to the tire checking of middle-size and small-size vehicle simultaneously.
Below in conjunction with accompanying drawing embodiments of the invention are described further.
The specific embodiment
Be described in detail below in conjunction with the accompanying drawing specific embodiments of the invention:
First kind of tire pressure monitoring system of the present invention comprises tire pressure monitoring module and central processing module, and with reference to shown in Figure 3, wherein, the tire pressure monitoring module comprises pressure sensor 11, is used to monitor the tire pressure of inner tube of vehicle tyre, output tire pressure signal; Signal conditioning circuit 12 is used to receive the tire pressure signal of pressure sensor 11 outputs, with the tire pressure signal amplify with Filtering Processing after export; Super low-power consumption microcontroller 13; The tire pressure signal that is used for 12 outputs of receiving signal reason circuit compares with setting HVT high voltage threshold it respectively with low pressure threshold, perhaps be higher than HVT high voltage threshold then export the tire pressure signal if the tire pressure signal is lower than low pressure threshold; If the tire pressure signal is not less than low pressure threshold and is not higher than HVT high voltage threshold; Then start the carrier sense function, control RF receiving and transmission module 14 gets into dormant state, and self also is configured to low-power consumption mode; RF receiving and transmission module 14 is used for the tire pressure signal of super low-power consumption microcontroller 13 outputs is launched.
In conjunction with shown in Figure 4, wherein, central processing module comprises RF receiving and transmission module 21, be used to receive the tire pressure monitoring module RF receiving and transmission module 14 emissions the tire pressure signal and with its output; Super low-power consumption microcontroller 22; The tire pressure signal that is used for 21 outputs of received RF transceiver module compares it respectively with setting HVT high voltage threshold and low pressure threshold, if the tire pressure signal is lower than low pressure threshold or is higher than HVT high voltage threshold then output alarm signal; If the tire pressure signal is not less than low pressure threshold and is not higher than HVT high voltage threshold; Then start the carrier sense function, control RF receiving and transmission module 21 gets into dormant state and (promptly intercepts electromagnetic wave faint in the air, if identical or closely similar with the setpoint frequency of oneself; Control the RF receiving and transmission module 21 entering receiving condition that will be activated so; Receive data subsequently, otherwise can get back to dormant state once more), and self also is configured to low-power consumption mode; Alarm module 23 is used to receive the alerting signal that super low-power consumption microcontroller 22 is exported, and exports corresponding alarm voice; Display module 24 is used to receive the alerting signal that super low-power consumption microcontroller 22 is exported, and output shows corresponding alarm message.The startup of the tire pressure monitoring module of present embodiment with close and can control by central processing module, this also be with the radio-frequency module of tire pressure monitoring module and central processing module radio-frequency module all be chosen as one of reason of RF receiving and transmission module.
In order to reach the requirement of further reduction power consumption, the super low-power consumption microprocessor in the tire pressure monitoring system of present embodiment can adopt the interruption of work mode as far as possible in course of normal operation, and replaces tediously long computed in software with the fast speed look-up table.
In conjunction with shown in Figure 5; In the tire pressure monitoring module; Pressure sensor 11 is US9011 pressure drag type pressure capsule and peripheral circuit thereof for model; Signal conditioning circuit 12 is instrument amplifier and the peripheral circuit thereof of LTC2053 for model; Super low-power consumption microcontroller 13 comprises that model is micro controller system and the peripheral circuit thereof of MSP430F149, and RF receiving and transmission module 14 comprises that model is rf chip and the peripheral circuit thereof of CC1101, and with the power frequency of rf chip coupling be the antenna matching network of 433MHz.Wherein, The 6th of pressure drag type pressure capsule links to each other with the 3rd pin through the 2nd of a resistance correspondence and instrument amplifier respectively with the 2nd pin; Pressure drag type pressure capsule can provide a pair of differential signal by the 2nd pin and the 6th pin according to real-time tire pressure; Measurement range can reach tens standard atmospheres, and the 7th pin of instrument amplifier links to each other with the 3rd pin of micro controller system.The the 38th, the 40th, the 42nd, the 44th, the 46th of micro controller system links to each other with the 20th pin with the 7th, the 6th, the 3rd, the 2nd, the 1st of rf chip with the 48th pin is respectively corresponding.The mode of operation of rf chip, transceive data etc. are by Single-chip Controlling; Micro controller system is regularly opened voltage stabilizing chip MIC5205; To pressure drag type pressure capsule and signal conditioning circuit power supply; Obtain the real-time pressure data, antenna matching network mainly is to guarantee that rf chip can be with frequency transceive data stable, nominal.And whole tire pressure monitoring module has battery BT power supply.
In conjunction with shown in Figure 6; In the central processing module; Super low-power consumption microcontroller 22 comprises that model is micro controller system and the peripheral circuit thereof of MSP430F149; RF receiving and transmission module 21 comprises that model is rf chip and the peripheral circuit thereof of CC1101, and with the power frequency of rf chip coupling be the antenna matching network of 433MHz.Wherein, alarm module 23 is the sound and light alarm module.The the 14th and the 15th pin of micro controller system is connected to the display data output interface, and the external LCD liquid crystal display of display data output interface has just constituted the display module 24 of central processing module.The the 38th, the 40th, the 42nd, the 44th, the 46th of micro controller system links to each other with the 20th pin with the 7th, the 6th, the 3rd, the 2nd, the 1st of rf chip with the 48th pin is respectively corresponding.In order to realize the communication of central processing module and upper computer, for the ease of system update and setting pressure threshold value, native system is provided with the communication port with PC at central receiver module end, and the 32nd and the 33rd pin of micro controller system is circumscribed with the UART serial interface.
In use, the central processing module of present embodiment generally is installed in the operator's compartment, and the tire pressure monitoring module is then as shown in Figure 7; Be installed in the annular arrangement spring tube 2 of each inner tube of vehicle tyre; The mouth of first RF receiving and transmission module of tire pressure monitoring module is electrically connected with the tire tube valve 101 of metal material on being installed in annular arrangement spring tube 2, generally, makes the high frequency emergent power maximum; Preferably use independently emitting antenna; Present embodiment has utilized independently dual-mode antenna of tire tube valve 101 conducts cleverly, and just in time satisfies the unipole designing requirement, also is that the length of unipole should be the quarter wave that transmits; The antenna matching network of present embodiment adopts the 433MHz work frequency; Its quarter wave is about 18 centimetres, and tire tube valve 101 just is about about 20 centimetres, thereby has avoided the special communication antenna of design and installation.Continuation is with reference to figure 7; This tire pressure monitoring module places in the box body 100 that has an air extractor vent 108; Air extractor vent 108 is used to make things convenient for the tire pressure of the pressure sensor 11 perception inner tube of vehicle tyre of tire pressure monitoring module; The hollow bolt of rear end plate 102 that is electrically connected with the mouth of the RF receiving and transmission module of tire pressure monitoring module is installed on the box body 100; The part of going deep in the box body 100 of hollow bolt of rear end plate 102 is provided with gas port 107, so do not influence the gas that charges and discharge of tire, the part of going deep in the box body 100 of hollow bolt of rear end plate 102 is weldingly fixed in the box body 100; Stretch out outside the annular arrangement spring tube 2 upper end of hollow bolt of rear end plate 102; Hollow bolt of rear end plate 102 is fixed on the annular arrangement spring tube 2 through external fixation nut 103, and the root of tire tube valve 101 is provided with negative thread, and the end of hollow bolt of rear end plate 102 is connected with the root sealing thread of tire tube valve 101.For reliable connection; Be provided with outer plate 104 between external fixation bolt 102 and the annular arrangement spring tube 2; When external fixation nut 103 was fastening, box body 100 was by being fixed on the annular arrangement spring tube 2 tightly, and simultaneously in order to prevent that box body 100 and outer plate 104 from damaging annular arrangement spring tubes 2; Be provided with outer rubber cushion 105 between the outside face of outer plate 104 and annular arrangement spring tube 2, box body 100 and and the inside face of the annular arrangement spring tube 2 of its joint between be provided with in rubber cushion 106.
As shown in Figure 8, second kind of tire pressure monitoring system of the present invention is primarily aimed at the vacuum tyre of large-scale, severe duty lorry and passenger vehicle use, comprises several tire pressure monitoring modules 51 and Central Control Module (CCM) 52.Real-time rotary state parameter when the tire pressure monitoring module is used to gather each tyre in operation, Central Control Module (CCM) compares the real time data and the normal data of each tire, notes abnormalities and reports to the police.
Tire pressure monitoring module 51 is fixedly mounted on Oversize vehicle, heavy goods vehicles with in the vacuum tyre; Comprise sensor 51a, gather microprocessor 51b, radiofrequency launcher 51c, power amplifier 51d, antenna matching network 51e and communication antenna 51f; Sensor 51a comprises the sensor that is used to gather all types of tyre rotation states such as pressure, temperature and acceleration/accel; All kinds of analog signal conversion that each sensor will collect are that digital signal is sent to collection microprocessor 51b; Gather microprocessor the digital signal that receives is handled, get rid of noise signal and the interference component in the signal in all types of digital signals, and all types of digital signals after will handling are that parameter marshalling is encoded with time; Form data code flow and export radiofrequency launcher 51c to; Radiofrequency launcher converts the data code flow that receives into radio-frequency signal, and radiofrequency signal is conducted to power amplifier 51d, and power amplifier amplifies signal; Provide long haul communication required emissive power; Power amplifier conducts to antenna matching network 51e with the radiofrequency signal that strengthens, and antenna matching network is accomplished the impedance match between power amplifier 51d signal emergent power and point of emergence and the communication antenna, guarantees that antenna impedance and driving source internal driving mate each other; Make radiofrequency signal pass through antenna matching network through the signal output feeder line by communication antenna 51f during to Central Control Module (CCM) 52 emission, emission power loss is minimum.
Central Control Module (CCM) 52 is installed in to be driven in the building; Comprise dual-mode antenna 52a, antenna matching network 52b, RF receiving and transmission module 52c, microcontroller 52d, display module 52e and alarm module 52f; Dual-mode antenna 52a receives each tire pressure monitoring module emitted radio signal; Convert the radio signal of accepting into each tire pressure monitoring module cooresponding data code flow through antenna matching network 52b by RF receiving and transmission module 52c; And being sent to microprocessor 52d, microprocessor is treated to the sensing data of corresponding tire respective type with each data code flow, and compares with the normal data that presets; And convert comparing result into display data and be sent to display module 52e, show in real time to supply the chaufeur reference.When microprocessor is found data exception, transmit alerting signal to alarm module 52f, alarm module sends sound, light, electric signal according to the warning warning signal.
As shown in Figure 9, the tire pressure monitoring modular circuit of second kind of tire pressure monitoring system of the present invention comprises integration module CH1, power amplifier CH3 and on-line debugging interface module CH2.In order to realize the measurement of big pressure; Must carry out careful selection to pressure sensor; Native system is selected the Freescale pressure sensor MPXY8320C of Highgrade integration for use, this sensor is integrated pressure, temperature and acceleration pick-up, and comprise as the 8-bit microprocessor of gathering microcontroller; Embedded 315/433MHz frequency range radiofrequency launcher of while, pressure measurement range can reach 15 barometric pressures.Power amplifier is selected RF2361; Have the characteristics of High Performance, low noise, high gain, HDR, and have the function of work standby mode, its working frequency range comprises the 433MHz frequency of operation; In this tire pressure monitoring modular circuit; Communication frequency adopts ISM band 434MHz, and modulation system is FSK, and communication baud rate uses 9600bps.The oscillation frequency of crystal oscillator Y01 is 22.0586MHz, base when being used to integration module CH1 and providing.
First capacitor C, the 101 parallelly connected first inductance coil L101; The two ends of first inductance coil connect the pin 15 and pin 14 of integration module CH1 respectively; The end of crystal oscillator Y01 connects the pin 4 of integration module CH1; The other end the 3rd capacitor C 103 back of connecting connects the pins 3 of integration module CH1, the pin of integration module CH1 3 series connection the 3rd capacitor C 103, second capacitor C, 102 back ground connection.The pin 5 of integration module CH1, pin 9 and pin 17 ground connection, pin 8 series connection the 4th capacitor C 104 back ground connection.The pin 10 of integration module CH1 is connected battery supply BT01 with pin 16, and pin 18 is connected with pin 2 with the pin 1 that pin 11 is connected to line debugging interface module CH2, pin 4 ground connection of on-line debugging interface module CH2, and pin 3 connects battery supply BT01.The pin 4 that connects power amplifier CH3 behind pin 3 series connection the 5th inductance coil L105 of on-line debugging interface module CH2.The 5th capacitor C 105 1 ends connect the 5th inductance coil L105, other end ground connection, and the 6th capacitor C 106 1 ends connect the 5th inductance coil L105, other end ground connection.Pin 2 and pin 5 ground connection of power amplifier CH3; Pin 1 series connection the 7th capacitor C 107 backs of power amplifier CH3 connect the second inductance coil L102 and the 3rd inductance coil L103 of parallel connection; The second inductance coil L102 connects the pin 7 of pin 6, the three inductance coil L103 connection integration module CH1 of integration module CH1.The 31 capacitor C 131 1 end ground connection; The other end first resistance R 101 back of connecting connects the pins 3 of power amplifier CH3; The 32 capacitor C 132 is parallelly connected with the 31 capacitor C 131, and the 8th capacitor C 108 1 ends connect the pin 3 of power amplifier CH3, other end ground connection.
The 9th capacitor C 109, the tenth capacitor C the 110, the 11 capacitor C 111 and the 4th inductance coil L104 form antenna matching network; The two ends of the 4th inductance coil L104 connect the tenth capacitor C 110 and the 11 capacitor C 111 respectively; The tenth capacitor C 110 and the 11 capacitor C 111 parallelly connected ground connection; The end of the 4th inductance coil L104 other ends that the 9th capacitor C 109 back connects pin 4, the four inductance coil L104 of power amplifier CH3 of connecting connect communication antennas.
Shown in figure 10, the Central Control Module (CCM) circuit of this tire pressure monitoring system comprises RF receiving and transmission module CH4, microcontroller CH5.RF receiving and transmission module adopts rf chip CC1101; Microcontroller adopts the super low-power consumption CMOS microcontroller MSP430F149 of 16 risc architectures of TI company; Embedded analogue to digital conversion energy supply of this microcontroller and voltage reference, but have that running velocity is fast, the few online programming of programming instruction, confidentiality be high, cheap.
The 14 inductance coil L114, the 19 capacitor C the 119, the 20 capacitor C 120 and the 21 capacitor C 121 are formed antenna matching network; The two ends of the 14 inductance coil L114 connect the 20 capacitor C 120 and the 21 capacitor C 121 respectively; The 20 capacitor C 120 and the 21 capacitor C 121 parallelly connected ground connection; Dual-mode antenna connects the end of the 14 inductance coil L114, and the other end of the 14 inductance coil L114 the 19 capacitor C 119 back of connecting connects the pins 13 and pins 12 of RF receiving and transmission module CH4.The pin 20 of RF receiving and transmission module CH4, pin 1, pin 2, pin 3, pin 6, pin 7, pin 41, pin 40, pin 39, pin 38, pin 37, the pin 36 of connection microcontroller CH5.The pin 2 of microcontroller CH5 is connected the corresponding point of connection of warning device ALARM with pin 3; The pin 4 of microcontroller CH5 is connected the corresponding point of connection of read out instrument LED with pin 5, the pin 32 of microcontroller CH5 is connected the corresponding point of connection of serial interface RS232 with pin 33.
After second kind of each module of tire pressure monitoring system of the present invention powers on; The collection microcontroller of each tire pressure monitoring module carries out system initialization, opens interruption, the cycle wakeup time is set at interval; Utilize the sensor temperature and pressure then; Detected temperature signal is revised, compensated pressure signal, data converted is conducted to communication antenna through radiofrequency launcher, power amplifier and antenna matching network send, get into dormant state then; The cycle wakeup time is to set through the on-line debugging interface module at interval.Pressure survey is different at interval with temperature survey at interval; The operated by rotary motion temperature survey is spaced apart about 4 times of pressure survey interval; So not only can guarantee can not leak the durability of adopting data but also guaranteeing battery supply; Simultaneously sent data at once, radio frequency amplifier (RFA) has been set at standby mode, further cut down the consumption of energy at sensor; In order to reach antimierophonic purpose, adopted Manchester encoding and CRC check in the software design, before data, added tire ID number, during emission each tire pressure monitoring module has been carried out random delay and prevent that the conflict that transmits between each tire from disturbing.
After Central Control Module (CCM) receives the wireless signal that sends from the tire pressure monitoring module through dual-mode antenna; Analogue to digital conversion via antenna matching network and RF receiving and transmission module sends data to controller; Controller carries out verification, processing and judgement when receiving data and to data; Carry out verification earlier, the errorless laggard line data of verification is handled, and then judges according to the related setting value whether tire pressure, temperature be normal.When tyre inner pressure is below or above predetermined pressure range, then start alarm module immediately, prompting driver current pressures such as the buzzer phone through alarm module, light-emitting diode are unusual, by display module tire internal pressure information shown simultaneously; In tyre inner pressure was in predetermined pressure range, display module prompting operation was normal.For the ease of system update and setting pressure threshold value, Central Control Module (CCM) is provided with the serial port of communicating by letter with PC.
The tire tube valve that is generally used for vacuum tire comprises the tire tube valve body of a joint metal circular tube and the seal adaptor of clad metal pipe, the tire tube valve body head be provided with head protector, the afterbody of tire tube valve body is positioned at the wheel rim inboard towards tire inner wall.
The through hole that passes on the wheel rim in the gas storage space that the head of tire tube valve body is inboard by wheel rim and tire forms stretches out, and seal adaptor is used for tire tube valve is captiveed joint with the through hole on the wheel rim, and valve core bodys such as check valve are installed in the metal circular tube usually.
Shown in figure 11; The embodiment 1 of the tire tube valve that is used to communicate by letter of the present invention comprises tire tube valve body 201 and connector 202; Tire tube valve body 201 is the cylinder that a left and right end face connects, and is processed with negative thread 201a on the cylindrical right-hand member inwall, and the middle part of tire tube valve body 201 bends on the right side.
Connector 202 comprises pipe 202a and circular permanent seat 202b; Captive joint with the left side of permanent seat 202b in the right side of pipe 202a; On permanent seat 202b, be provided with the first through hole 202c that runs through left and right end face, the inner chamber of the first through hole 202c and pipe 202a connects.Be processed with cooresponding outside thread on the excircle of pipe 202a with negative thread 201a.
The signal output feeder line of wireless transmitter module is fixedly connected on the annular splicing ear 203, annular splicing ear is enclosed within on the pipe 202a, tire tube valve body, annular splicing ear and connector are connected to one through screw thread.
Like Figure 12 and shown in Figure 13, be fixedly connected with the seal adaptor 204 of same metal material on the outside face of tire tube valve body 201, fix through the through hole on seal adaptor and the vacuum tyre wheel rim.
In the use; Utilize the communication antenna of the tire tube valve of present embodiment as vacuum tyre; Set the length of communication antenna according to the signal frequency range of wireless transmitter module; In the cavity that forms by the wheel rim outside and vacuum tyre, the communication antenna top is used for fixing on wheel rim in the through hole of tire tube valve and stretches out, and the use seal adaptor is fixed on the communication antenna end on the wheel rim.The tire pressure monitoring module is fixed on the terminal seal adaptor of communication antenna through connector after with moulding material package.Further can also the tire pressure monitoring module after the encapsulation be fixed on the wheel rim inboard.
Adopt the communication antenna of the tire tube valve of present embodiment, can effectively promote the Applicable scope of tire pressure monitoring warning as vacuum tyre.The tire tube valve of present embodiment is in the tire carcass outside; The metal wool of having avoided being used in the tire construction reinforcing, metal cord are to the shielding of wireless signal; Can effectively reduce the emissive power of tire pressure monitoring module, reduce power consumption, prolong the service life of battery supply.The tire tube valve size of present embodiment and fixed angle are easy to adjustment, make antenna and RF receiving/transmission device more be prone to realize impedance match.On the other hand, tire tube valve is in the tire carcass outside, helps improving the intensity of wireless signal, when tire pressure monitoring module emissive power is identical, realizes longer-distance radio communication more easily, improves data transmission rate, reduces the bit error ratio.The tire tube valve of present embodiment can effectively be avoided large-scale car body blocking wireless signal transmission paths as omnidirectional antenna.
According to the shape and size of common vacuum tyre wheel rim, and the lead to the hole site that is used for fixing tire tube valve on the wheel rim, the bending of tire tube valve body 201 can be set at 10 degree, 15 degree, or 30 degree.
Shown in figure 14, the embodiment 1 of the tire tube valve that is used for communicating by letter of the present invention, the first through hole 211a opening shape of connector 211 is a yi word pattern.Shown in figure 15, the first through hole 212a opening shape of connector 212 is cross.Shown in figure 16, the first through hole 213a opening shape of connector 213 is hexagonal.Above opening shape helps using tightening device such as screwdriver to be fixed.
Shown in figure 17; The embodiment 2 of the tire tube valve that is used to communicate by letter of the present invention; Under the similar situation of other structures and embodiment 1, comprise tire tube valve body 221 and connector 222, tire tube valve body 221 is an end osed top pipe; Have second through hole 224, the second through holes, 224 inwalls and connector 202 on the tube wall near the pipe closed end through being threaded.
Present embodiment in use; The signal output feeder line of wireless transmitter module is fixedly connected on the annular splicing ear 203; Annular splicing ear is enclosed within on the connector 202; Tire tube valve body, annular splicing ear and connector are connected to one, the tire pressure monitoring module is fixed on after with moulding material package on the terminal seal adaptor of communication antenna.
The embodiment 1 and the embodiment 2 of the tire tube valve that is used to communicate by letter of the present invention also can be applied in Central Control Module (CCM), as the dual-mode antenna of Central Control Module (CCM).
The tire tube valve that is used to communicate by letter of the present invention is provided with special-purpose air guide channel, so do not influence the gas that charges and discharge of tire, the signal output feeder line of transmitting terminal links to each other with tire tube valve through connection terminal on the circuit card, and installation, maintenance is very convenient.
The embodiment 3 of the tire tube valve that is used to communicate by letter of the present invention is that direct signal output feeder line with the circuit transmitting terminal directly is welded on the tire tube valve body; Not to the air guide channel complete closed of tire tube valve; This connection mode is higher to welding process requirement, is unfavorable for realizing impedance match, causes the emissive power loss easily; Also be unfavorable for simultaneously installing and detecting debugging, but can utilize to greatest extent existing tire tube valve.
Above-described embodiment describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the prerequisite of spirit not breaking away from the present invention; Various distortion and improvement that those of ordinary skills make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.