CN205326710U - Tire pressure receiver based on transmission of RF signal frequency hopping - Google Patents
Tire pressure receiver based on transmission of RF signal frequency hopping Download PDFInfo
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- CN205326710U CN205326710U CN201521069662.0U CN201521069662U CN205326710U CN 205326710 U CN205326710 U CN 205326710U CN 201521069662 U CN201521069662 U CN 201521069662U CN 205326710 U CN205326710 U CN 205326710U
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Abstract
The utility model relates to a tire pressure monitoring system, especially tire pressure receiver based on transmission of RF signal frequency hopping. The utility model discloses a tire pressure receiver based on transmission of RF signal frequency hopping, including fixed sequential generation ware, control center and SD -PLL phase -locked loop. The periodic pulse that produces different width tn of fixed sequential generation ware, control center is different pulse train with different width tn's pulse record, produce different control signal according to different pulse train again, control center is according to the switch of different control signal selection with SD -PLL phase -locked loop intercommunication, SD -PLL phase -locked loop basis is different with turned on switch's, will receive the data modulation and pass back to different frequencies control center makes the receive frequency select between fn and trades the switching, n more than or equal to 2. The utility model has the advantages of avoid the same frequency interference signal in the on -vehicle and surrounding environment, improve the receipt success rate of signal.
Description
Technical field
This utility model relates to system for monitoring pressure in tyre, is particularly based on the tire pressure receptor of RF signal frequency-hopping transmissions。
Background technology
Tire pressure receptor is the important component part of monitoring system for tyres of automobile。The tire pressure receptor mode by RF, receives the tire internal air pressure that tyre pressure sensor sends out, temperature, and the Monitoring Data of internal battery electricity, and shows tire pressure situation, and by the setting in tire pressure receptor, it is judged that whether tire there is exception。
Current tyre pressure sensor is all by built-in chip, completes inner tyre pressure, temperature, the measurement of battery electric quantity。And set tire pressure report to the police threshold value, at rapid air leakage, electricity is too low, tire pressure too high too low when send danger warning。Owing to built-in tyre pressure sensor is arranged on inside tires, and it is in high speed rotating state in the process of moving, therefore only by wirelessly transmitting data with the external world。The frequency range of current domestic permission is: 433.92MHz. transmitting power limit value: 10mW (e.r.p), occupied bandwidth: be not more than 400kHz。
Wireless communication signal within domestic automobile all adopts 433.92MHz。Due to being on the increase of electronic equipment, the equipment of this frequency range above car load, is used to be continuously increased。RKE, navigation, MP3, wireless charger, control of bluetooth access key, onboard wireless charging, nearby vehicle etc.。Plus the Related product using this frequency range in external environment, it is easy to cause interfering of signal。And in order to prevent disturbing other signals, Ministry of Industry and Information is also restricted to the intensity launching signal。The signal being arranged on the tyre pressure sensor inside automotive hub and vehicle-mounted tire pressure receptor is weakened very big。Thus it is more easy to the phenomenon that lossing signal occurs。
Utility model content
This utility model purpose is in that to provide a kind of co-channel interference signal being effectively shielded from vehicle-mounted and surrounding, improves the tire pressure receptor of the successful receiving rate of signal。
The technical solution of the utility model is achieved in that
Based on the tire pressure receptor of RF signal frequency-hopping transmissions, including fixed sequence program maker, control centre and SD-PLL phaselocked loop。Described fixed sequence program maker periodically produces the pulse of different in width Tn, and n is be more than or equal to 2；The pulse of different in width Tn enters described control centre, and the pulse recording of the described different in width Tn of detection is different pulse train by described control centre；Producing different control signals according to different pulse trains again, described control centre selects the switch connected with SD-PLL phaselocked loop according to different control signals；Described SD-PLL phaselocked loop, according to different from described control centre turn on-switch, modulated different frequencies pass described control centre back by being received data。Data are analyzed by control centre, it may be judged whether meet the protocol requirement communicated with sensor；As met the communication protocol requirements of sensor, control centre suspends the pulse generation of fixed sequence program maker until sensor signal finishes receiving；If being unsatisfactory for the communication protocol requirements with sensor, control centre selects next to switch according to pulse train；Making reception frequency select between fn and change switching, n is be more than or equal to 2。
After data receiver completes, control centre opens fixed sequence program generator, and fixed sequence program generator continues to send fixed sequence program pulse。
Further, the switch number of described control centre is n, identical with the pulse width number of different in width Tn。
Further, the pulse sequence width that described fixed sequence program maker produces sends 1/n, the n of protocol synchronization length be more than or equal to 2 less than sensor。
This utility model has the advantage that
1, can according to the pulse of the multiple width of how many generations of random number (n >=2), it is achieved the radio frequency reception of multifrequency point, it is to avoid interference。
2, tire pressure receptor can identify the frequency of the signal needing reception automatically, is automatically adjusted reception frequency, it is ensured that the signal of each Frequency point can be properly received。
Accompanying drawing explanation
Fig. 1 is this utility model schematic diagram。
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described further, following example are only preference, it is not that scope of the present utility model is any limitation as, on the contrary, its objective is that this utility model that is arranged in wishing to contain various change and tool equality is intended in the category of the scope of the claims of application。
Embodiment:
A kind of tire pressure receptor based on RF signal frequency-hopping transmissions, including fixed sequence program maker, control centre and SD-PLL phaselocked loop。
Fixed sequence program maker periodically produces the pulse of different in width t1, t2, t3。
The pulse of t1, t2, t3 different in width enters control centre。
The pulse of t1, t2, t3 different in width is detected by control centre, is pulse train s1 by the pulse recording of t1 width；It is pulse train s2 by the pulse recording of t2 width；It is pulse train s3 by the pulse recording of t3 width。
Control centre is detecting that pulse train s1 produces control signal C1, and control centre is detecting that pulse train s2 produces control signal C2, and control centre is detecting that pulse train s3 produces control signal C3。
Control signal C1 is exported by control centre, select switch contact 1 position, the frequency of SD-PLL gating f1 (433.42MHz), the data of the tyre pressure sensor received are entered control centre by the rate-adaptive pacemaker of f1 (433.42MHz), control data are coded into row analysis, it may be judged whether meet the protocol requirement communicated with sensor；As met the communication protocol requirements of tyre pressure sensor, control centre suspends fixed sequence program maker and produces pulse, until after data receiver completes, control centre opens fixed sequence program generator, sequencer continues to send fixed sequence program pulse。
If being unsatisfactory for the communication protocol requirements of sensor, control centre strobe pulse sequence s2, control signal C2 is exported by control centre, select switch contact 2 position, the frequency of SD-PLL gating f2 (433.92MHz), by the data of tyre pressure sensor that receive by the rate-adaptive pacemaker of f2 (433.92MHz), enters control centre, data are coded into row analysis by control centre, it may be judged whether meet the protocol requirement communicated with sensor；As met the communication protocol requirements of sensor, control centre suspends fixed sequence program maker and produces pulse, until after data receiver completes, control centre opens fixed sequence program generator, sequencer continues to send fixed sequence program pulse。
If being unsatisfactory for the communication protocol requirements of sensor, control centre reselection pulse train s3, control signal C3 is exported by control centre, selects switch contact 3 position, the frequency of SD-PLL gating f3 (434.42MHz)；By the data of tyre pressure sensor that receive by the rate-adaptive pacemaker of f3 (434.42MHz), enter control centre, control data are coded into row analysis, it may be judged whether meet the protocol requirement communicated with sensor；As met the communication protocol requirements of sensor, control centre suspends fixed sequence program maker and produces pulse, until after data receiver completes, control centre opens fixed sequence program generator, sequencer continues to send fixed sequence program pulse。
If being unsatisfactory for the communication protocol requirements of sensor, control centre selects pulse train s1 again, circulates successively。
The data receiving sensor transmission are made directly SD-PLL, according to control signal C1, selection that C2, C3 are different so that data are modulated onto f1 (433.42MHz), f2 (433.92MHz) or f3 (434.42MHz) and send out。
Claims (3)
1. based on the tire pressure receptor of RF signal frequency-hopping transmissions, it is characterised in that include
Fixed sequence program maker, described fixed sequence program maker periodically produces the pulse of different in width Tn, and n is be more than or equal to 2；
Control centre, the pulse recording of described different in width Tn of detection is different pulse train by described control centre；Producing different control signals according to different pulse trains again, described control centre selects the switch connected with SD-PLL phaselocked loop according to different control signals；
Described SD-PLL phaselocked loop, according to different from described control centre turn on-switch, modulated different frequencies pass described control centre back by being received data。
2. a kind of tire pressure receptor based on RF signal frequency-hopping transmissions according to claim 1, it is characterised in that the switch number of described control centre is n, identical with the pulse width number of different in width Tn。
3. a kind of tire pressure receptor based on RF signal frequency-hopping transmissions according to claim 1, it is characterised in that the pulse sequence width that described fixed sequence program maker produces sends 1/n, the n of protocol synchronization length be more than or equal to 2 less than sensor。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521069662.0U CN205326710U (en) | 2015-12-21 | 2015-12-21 | Tire pressure receiver based on transmission of RF signal frequency hopping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521069662.0U CN205326710U (en) | 2015-12-21 | 2015-12-21 | Tire pressure receiver based on transmission of RF signal frequency hopping |
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| Publication Number | Publication Date |
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| CN205326710U true CN205326710U (en) | 2016-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521069662.0U Active CN205326710U (en) | 2015-12-21 | 2015-12-21 | Tire pressure receiver based on transmission of RF signal frequency hopping |
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| CN (1) | CN205326710U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107415604A (en) * | 2017-08-30 | 2017-12-01 | 联创汽车电子有限公司 | TPMS systems and its communication means |
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2015
- 2015-12-21 CN CN201521069662.0U patent/CN205326710U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107415604A (en) * | 2017-08-30 | 2017-12-01 | 联创汽车电子有限公司 | TPMS systems and its communication means |
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