CN108880596A - Remote control circuit based on automobile-used RKE double frequency transmitting and independent RFA - Google Patents
Remote control circuit based on automobile-used RKE double frequency transmitting and independent RFA Download PDFInfo
- Publication number
- CN108880596A CN108880596A CN201810747370.XA CN201810747370A CN108880596A CN 108880596 A CN108880596 A CN 108880596A CN 201810747370 A CN201810747370 A CN 201810747370A CN 108880596 A CN108880596 A CN 108880596A
- Authority
- CN
- China
- Prior art keywords
- circuit
- antenna
- rfa
- rke
- remote control
- 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.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
Abstract
The present invention is based on the remote control circuits of automobile-used RKE double frequency transmitting and independent RFA, are related to vehicle long-distance remote control key system technical field.The RKE double frequency transmitting is connected with transmitting antenna (4) by electric signal by the first MCU (1), radio frequency chip (2), loop antenna (3).Independent RFA receives circuit by receiving antenna (5), 2nd MCU (6), match circuit (14) between first intervalve matching circuit (7), the second intervalve matching circuit (10), third intervalve matching circuit (11), the fourth stage, the first bandpass filter (8), the second bandpass filter (12) and the first low-noise amplifier (9), the second low-noise amplifier (13) are connected by electric signal.Double frequency transmitting is approached with the remote control distance for making 433.92MHz and 314.9MHz is received, and dominant frequency 433.92MHz is better than 60 meters in field testing, and sub-frequency 314.9MHz is better than 50 meters.
Description
Technical field
The present invention relates to vehicle long-distance remote control key system technical fields, refer specifically to a kind of based on the transmitting of automobile-used RKE double frequency
With the remote control circuit of independent RFA.
Background technique
Core component includes the RKE at remote-transmitter end and the RFA of receiving end in car entry system.RKE, that is, automobile key
After recognizing effective key information, the microcontroller in key can be waken up, radiofrequency launcher of the microcontroller to key
A string of data flows comprising key information are sent, which includes waking up code, guidance code, key identification code, function code, encryption
The parts such as rolling code and check code, radiofrequency launcher complete signal up-conversion, up-converter circuit include modulator, frequency multiplier and
Power amplifier, generally uses ASK or FSK modulation mode, and power amplifier generally uses the higher E class power amplification of efficiency
Device.It includes that radio frequency reception part and decoded portion pass through after receiving the radiofrequency signal of key sending that RFA, which receives end part,
Lower frequency changer circuit moves signal spectrum to intermediate frequency, and lower frequency changer circuit includes antenna, low-noise amplifier, mirror filter, puts
Circuits, the intermediate-freuqncy signals such as big device, frequency mixer, automatic growth control, intermediate frequency filtering are sent again to base band, are demodulated just by baseband circuit
True data flow is then sent to the legitimacy of other controller verify datas, and output phase answers command information to holding if legal
Row device, and then the functions such as boot are locked, unlocked and switched accordingly.In vehicle resource allocation, independent RFA can be mentioned
For best position, the poor region of electromagnetic interference is avoided, the noise level for receiving signal can be reduced, synchronous improve connects
The sensitivity of receipts machine, and then improve the remote control distance of vehicle.Electromagnetic interference is relatively more multiple in most cases for the use environment of automobile
Miscellaneous, wherein the exploitation for seeking vehicle function is used and provided convenience for vehicle user, but use environment such as garage etc. has electromagnetism
The serious feature of signal fadeout, the transmitting of transmitting terminal strong signal and receiving end high sensitivity can be declined with thermal compensation signal.City at present
Mainstay on field is key and the end RFA and controller Integrated design, and working frequency is 433.92MHz or 314.9MHz
Single-frequency, remote control distance also only have 30 meters or so.
Summary of the invention
It is an object of the invention to overcome missing and deficiency of the existing technology, propose a kind of based on automobile-used RKE double frequency
The remote control circuit of transmitting and independent RFA design.
The present invention is a kind of remote control circuit based on automobile-used RKE double frequency transmitting and independent RFA, and RKE double frequency emits by first
MCU, radio frequency chip, loop antenna and transmitting antenna are connected by electric signal.
Independent RFA receives circuit by receiving antenna, the 2nd MCU, the first intervalve matching circuit, the second intervalve matching circuit,
Match circuit and the first bandpass filter, the second bandpass filter and the first low noise between third intervalve matching circuit, the fourth stage
Amplifier, the second low-noise amplifier are connected by electric signal.
Wherein, the first MCU is monolithic IC chip RF430F5144；
The radio frequency chip is monolithic IC chip ATA5749；
The loop antenna is 433.92MHz transmitting antenna, is connect by diodes in parallel capacitor with transmitting antenna, is formed
314.9MHz transmitting antenna；
The receiving antenna is helical antenna, can receive 433.92MHz and 314.9MHz signal；
2nd MCU is to receive chip NCF2912；
Electricity is matched between first intervalve matching circuit, the second intervalve matching circuit, third intervalve matching circuit, the fourth stage
Road is lc circuit；
First bandpass filter, the second bandpass filter are respectively the B3739 and B3743 of SAW filter；
First low-noise amplifier, the second low-noise amplifier are one chip amplifier BFP540.
As described above, the end RKE of the present invention uses low-cost PCB loop antenna, frequency hopping range is increased into 119MHz,
The open and close of diode can control antenna resonant frequency, and then double frequency emissive porwer is made to reach optimum state.It receives
The helical antenna for holding RFA that double antenna is used to share, low-noise amplifier effective compensation front end loss, dual frequency reception sensitivity are equal
It can be better than -108dBm.Double frequency transmitting effectively increases the anti-interference ability of system with reception, makes 433.92MHz and 314.9MHz
Remote control distance it is close, and dominant frequency 433.92MHz is better than 60 meters in field testing, and sub-frequency 314.9MHz is better than 50 meters.
Detailed description of the invention
Fig. 1, which is that the present invention is based on the transmittings of automobile-used RKE double frequency, connects block diagram with the remote control circuit of independent RFA；
Fig. 2 is circuit diagram of the embodiment of the present invention.
Specific implementation method
Below in conjunction with drawings and examples, the invention will be further described
A kind of remote control circuit (as shown in Fig. 1) based on automobile-used RKE double frequency transmitting and independent RFA, it is characterized in that, institute
It states RKE double frequency to emit by the first MCU1, radio frequency chip 2, loop antenna 3 is connected with transmitting antenna 4 by electric signal.
The embodiment of the present invention, the independent RFA receive circuit by receiving antenna 5, the 2nd MCU6, the first intervalve matching circuit
7, match circuit 14 and the first bandpass filter 8 between the second intervalve matching circuit 10, third intervalve matching circuit 11, the fourth stage,
The low-noise amplifier 9 of second bandpass filter, 12 and first, the second low-noise amplifier 13 connect (such as attached drawing 2 by electric signal
It is shown).
First MCU1 is monolithic IC chip RF430F5144；
The radio frequency chip 2 is monolithic IC chip ATA5749；
The loop antenna 3 is 433.92MHz transmitting antenna, is connect by diodes in parallel capacitor with transmitting antenna 4, group
At 314.9MHz transmitting antenna；
The receiving antenna 5 is helical antenna, can receive 433.92MHz and 314.9MHz signal；
2nd MCU6 is to receive chip NCF2912；
Between first intervalve matching circuit 7, the second intervalve matching circuit 10, third intervalve matching circuit 11, the fourth stage
Match circuit 14 is lc circuit；
First bandpass filter 8 and the second bandpass filter 12 be respectively SAW filter B3739 and
B3743；
First low-noise amplifier 9 and the second low-noise amplifier 13 are one chip amplifier BFP540.
As described above, the end RKE of the present invention uses low-cost PCB loop antenna, frequency hopping range is increased into 119MHz,
The open and close of diode can control antenna resonant frequency, and then double frequency emissive porwer is made to reach optimum state.It receives
The helical antenna for holding RFA that double antenna is used to share, low-noise amplifier effective compensation front end loss, dual frequency reception sensitivity are equal
It can be better than -108dBm.Double frequency transmitting effectively increases the anti-interference ability of system with reception, makes 433.92MHz and 314.9MHz
Remote control distance it is close, and dominant frequency 433.92MHz is better than 60 meters in field testing, and sub-frequency 314.9MHz is better than 50 meters.It overcomes
Mainstay currently on the market is key and the end RFA and controller Integrated design, and working frequency be 433.92MHz or
314.9MHz single-frequency, remote control distance also only have the technical problems such as 30 meters or so, are vehicle long-distance remote control key system technology
A kind of solid technology material base is provided.
Claims (2)
1. a kind of remote control circuit based on automobile-used RKE double frequency transmitting and independent RFA, which is characterized in that RKE double frequency transmitting by
First MCU (1), radio frequency chip (2), loop antenna (3) and transmitting antenna (4) are connected by electric signal；
Independent RFA receives circuit by receiving antenna (5), the 2nd MCU2 (6), the first intervalve matching circuit (7), the second interstage matched
Match circuit (14) between circuit (10), third intervalve matching circuit (11), the fourth stage, the first bandpass filter (8), the second band logical
Filter (12) is connected with the first low-noise amplifier (9), the second low-noise amplifier (13) by electric signal.
2. the remote control circuit as described in claim 1 based on automobile-used RKE double frequency transmitting and independent RFA, which is characterized in that described
First MCU (1) is monolithic IC chip RF430F5144；
The radio frequency chip (2) is monolithic IC chip ATA5749；
The loop antenna (3) is 433.92MHz transmitting antenna, and by diode and capacitor is connect with transmitting antenna (4), is formed
314.9MHz transmitting antenna；
The receiving antenna (5) is helical antenna, can be with Asynchronous Reception 433.92MHz and 314.9MHz signal；
2nd MCU (6) is to receive chip NCF2912；
First intervalve matching circuit of grade (7), the second intervalve matching circuit (10), third intervalve matching circuit (11), the 4th
Intervalve matching circuit (14) is lc circuit；
First bandpass filter (8), the second bandpass filter (12) are respectively the B3739 and B3743 of SAW filter；
First low-noise amplifier (9), the second low-noise amplifier (13) are one chip amplifier BFP540.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810747370.XA CN108880596A (en) | 2018-07-09 | 2018-07-09 | Remote control circuit based on automobile-used RKE double frequency transmitting and independent RFA |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810747370.XA CN108880596A (en) | 2018-07-09 | 2018-07-09 | Remote control circuit based on automobile-used RKE double frequency transmitting and independent RFA |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108880596A true CN108880596A (en) | 2018-11-23 |
Family
ID=64300425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810747370.XA Pending CN108880596A (en) | 2018-07-09 | 2018-07-09 | Remote control circuit based on automobile-used RKE double frequency transmitting and independent RFA |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108880596A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020139786A1 (en) * | 2018-12-27 | 2020-07-02 | Continental Automotive Systems, Inc. | Antenna and tuning system for remote signal communication system with four band operation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10304081A1 (en) * | 2002-10-24 | 2004-05-19 | Visteon Global Technologies, Inc., Dearborn | Motor vehicle remote keyless entry access system, has a dual frequency transmitter and matching receiver so possibility of interference by another transmitter on both channels is small |
| CN101227206A (en) * | 2007-01-17 | 2008-07-23 | 株式会社电装 | Vehicle control system and method, and component devices |
| CN102386485A (en) * | 2011-09-15 | 2012-03-21 | 清华大学 | Loop and inverted-F-shaped reconfigurable cell phone built-in antenna |
| CN203180912U (en) * | 2013-04-23 | 2013-09-04 | 上海通用汽车有限公司 | Vehicle remote-control sending and receiving device |
| CN105243711A (en) * | 2015-10-14 | 2016-01-13 | 温州长江汽车电子有限公司 | Double-frequency transmitting-receiving device for automobile keyless entry system |
| CN106470040A (en) * | 2015-08-17 | 2017-03-01 | 恩智浦有限公司 | Dual band transmitter |
-
2018
- 2018-07-09 CN CN201810747370.XA patent/CN108880596A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10304081A1 (en) * | 2002-10-24 | 2004-05-19 | Visteon Global Technologies, Inc., Dearborn | Motor vehicle remote keyless entry access system, has a dual frequency transmitter and matching receiver so possibility of interference by another transmitter on both channels is small |
| CN101227206A (en) * | 2007-01-17 | 2008-07-23 | 株式会社电装 | Vehicle control system and method, and component devices |
| CN102386485A (en) * | 2011-09-15 | 2012-03-21 | 清华大学 | Loop and inverted-F-shaped reconfigurable cell phone built-in antenna |
| CN203180912U (en) * | 2013-04-23 | 2013-09-04 | 上海通用汽车有限公司 | Vehicle remote-control sending and receiving device |
| CN106470040A (en) * | 2015-08-17 | 2017-03-01 | 恩智浦有限公司 | Dual band transmitter |
| CN105243711A (en) * | 2015-10-14 | 2016-01-13 | 温州长江汽车电子有限公司 | Double-frequency transmitting-receiving device for automobile keyless entry system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020139786A1 (en) * | 2018-12-27 | 2020-07-02 | Continental Automotive Systems, Inc. | Antenna and tuning system for remote signal communication system with four band operation |
| US11955724B2 (en) | 2018-12-27 | 2024-04-09 | Continental Automotive Systems, Inc. | Antenna and tuning for key fob with four band operation |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181123 |
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