CN201915717U - Keyless entry system for intelligent security door - Google Patents
Keyless entry system for intelligent security door Download PDFInfo
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- CN201915717U CN201915717U CN2010206768661U CN201020676866U CN201915717U CN 201915717 U CN201915717 U CN 201915717U CN 2010206768661 U CN2010206768661 U CN 2010206768661U CN 201020676866 U CN201020676866 U CN 201020676866U CN 201915717 U CN201915717 U CN 201915717U
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Abstract
The utility model relates to a keyless entry system for an intelligent security door, comprising a main machine part arranged inside the security door and a key part arranged inside a remote control, wherein the main machine part comprises a trigger, a low-frequency (LF) emitter, a passive keyless entry (PKE) receiver and an execution component; the trigger is linked with the LF emitter; the execution component is linked with the PKE receiver; the PKE receiver comprises a radio frequency (RF) receiver, a decoder and a driver; the decoder is provided with an input end which is linked with the RF receiver and an output end which is linked with the driver; the driver is linked with the execution component; the key part comprises a radio frequency (RF) emitter, an encoder, buttons and a tri-axial analogy front end (AFE); the tri-axial AFE is provided with an antenna and a resonance circuit; the encoder is provided with an input end which is connected with the tri-axial AFE and the buttons, and an output end which is connected with the RF emitter; and the RF receiver of the main machine part and the RF emitter of the key part are wirelessly linked, so that the technical problems that the intelligent lock is inconvenient to use and low in security coefficient in a traditional unlocking way are solved.
Description
Technical field
The utility model relates to keyless access system, particularly the intelligent anti-theft door keyless access system.
Background technology
RKE (Renote Keyless Entry) remote-control key enters system, and it is made up of transmitter and receiver.Transmitter comprises button, encrypting module, radiating circuit and battery; Receiver comprises information processing single-chip microcomputer, Receiver Module and output control circuit.When the user pressed transmitter control button, data message was sent by transmitting antenna with the scrambling coding form, carried out data at the receiving terminal receiver and received identification and open lock.This system adopts the RFID(radio frequency identification) technology, it is a kind of contactless automatic identification technology, it can and obtain related data by the automatic recognition objective object of radiofrequency signal, and identification work need not manual intervention, can work in various adverse circumstances.The RFID technology can be discerned high-speed moving object and can discern a plurality of labels simultaneously, and is swift and convenient to operate.
Keyless door access control system (PKE, Passive Keyless Entry) on the RKE basis, grows up, progressively develop as anti-theft technique of new generation, progressively entered field, middle-grade car market at present from luxury car market, not only high-end automakers such as benz, BMW have extensively adopted PKE, also adopt this technology one after another as medium-sized vehicles such as Ford Mondeo, the sounds of nature made in Japan and novel Mazdas.PKE is not traditional key, but an Intelligent key is similar to smart card.When the driver stepped into specified scope, this system was judged if the driver of legal authorization then opens the door automatically by identification.After getting on the bus, the driver only need get final product the starting ignition switch by a button.
In the market the PKE system is applied on the vehicle mostly as standard or optional accessory, also is not applied on the intelligent anti-theft door.
At present, intelligence lock can be divided into according to the mode of opening is installed: three kinds on radio frequency lock, Fingerprint Lock, coded lock, in actual product, can make up the unlatching of carrying out the intelligence lock arbitrarily in these three kinds of modes, as radio frequency+password, radio frequency+fingerprint+password, fingerprint+password etc., but no matter utilize which kind of combination, inconvenience and the not high problem of safety can appear all using.
Therefore, utilize the PKE technology, developing the intelligent anti-theft door keyless access system is trend of the times, solves easily and effectively in the traditional opening ways of intelligence lock and uses inconvenience and the high technical problem of safety factor.
The utility model content
The purpose of this utility model is to provide the intelligent anti-theft door keyless access system, employing with the PKE system applies on intelligent anti-theft door, replaced the traditional opening ways of intelligent lock, solved in the intelligent lock tradition opening ways and used inconvenience and the high technical problem of safety factor.
The intelligent anti-theft door keyless access system, comprise and be located at the host machine part in the security door and be located at the interior key part of remote controller, described host machine part comprises trigger, LF transmitter, PKE receiver and execution unit, trigger and LF transmitter link, and execution unit and PKE receiver link:
Described PKE receiver comprises RF receiver, decoder and driver, and decoder is provided with input and connects with the RF receiver, and decoder is provided with output and connects with driver, and driver connects with execution unit.
Described key partly comprises RF transmitter, encoder, button and three AFE(analog front end) AFE, described three AFE(analog front end) AFE are provided with antenna and the resonance circuit that is used to receive the LF launcher signal, and encoder is provided with input and three AFE(analog front end) AFE, by key connecting; Encoder is provided with output and connects with the RF transmitter; Be located at the RF receiver and the RF transmitter wireless connections of being located at the key part of host machine part.
Preferably, the input of decoder connects with trigger, and described trigger comprises the button of being located at security door handle inboard, and described execution unit comprises safe-guard door lock.
Preferably, three AFE(analog front end) AFE comprise three antennas and three resonance circuits, and described three antennas are mutually perpendicular X-axis antenna, Y-axis antenna and Z axle antenna.
Compared with prior art, there is following technique effect in the utility model:
The utility model adopts the interior host computer control signal of key part inductive theft-proof door in the remote controller, need not to use key, and uses the hopping code of encrypting, and password extremely is difficult for repeating, and makes the high characteristics of coefficient easy to use, safe that the utlity model has.
Description of drawings
Fig. 1 is the structural representation of the utility model intelligent anti-theft door keyless access system;
Fig. 2 is the DES code pattern of the utility model intelligent anti-theft door keyless access system;
Fig. 3 is the DES decoding figure of the utility model intelligent anti-theft door keyless access system;
Fig. 4 is the button DES hardware encipher partial circuit of the utility model intelligent anti-theft door keyless access system;
Fig. 5 is the transmission part RF front-end circuit of the utility model intelligent anti-theft door keyless access system;
Fig. 6 is the receiving unit RF front-end circuit of the utility model intelligent anti-theft door keyless access system;
Fig. 7 is the receiving unit microprocessor control circuit of the utility model intelligent anti-theft door keyless access system;
Fig. 8 is the coding encrypting operating process of the utility model intelligent anti-theft door keyless access system;
Fig. 9 is the decoding deciphering flow process of the utility model intelligent anti-theft door keyless access system;
Figure 10 is the component parameter of the utility model intelligent anti-theft door keyless access system.
The specific embodiment
Below in conjunction with accompanying drawing, further detailed narration is done in invention to this reality.
The intelligent anti-theft door keyless access system, please refer to Fig. 1, comprise the host machine part of being located in the security door 2 and be located at the interior key part 1 of remote controller, described host machine part 2 comprises trigger 4, LF transmitter 24, PKE receiver and execution unit 3, trigger 4 links with LF transmitter 24, and execution unit 3 links with the PKE receiver:
Described PKE receiver comprises RF receiver 21, decoder 22 and driver 23, and decoder 22 is provided with input and connects with the RF receiver, and decoder 13 outputs connect with driver 23, and driver 23 connects with execution unit 3.
Described key partly comprises RF transmitter 12, encoder 13, button 14 and three AFE(analog front end) AFE11, described three AFE(analog front end) AFE11 are provided with antenna and the resonance circuit that is used to receive LF transmitter 12 signals, and encoder 13 is provided with input and connects with three AFE(analog front end) AFE11, button 14; Encoder 13 is provided with output and connects with RF transmitter 12; Be located at the RF receiver 21 and RF transmitter 12 wireless connections of being located at the key part of host machine part 2.
The input of decoder 13 connects with trigger 4, and described trigger 4 comprises the button 14 of being located at security door handle inboard, and described execution unit 3 comprises safe-guard door lock.
Three AFE(analog front end) AFE11 comprise three antennas and three resonance circuits, and described three antennas are mutually perpendicular X-axis antenna, Y-axis antenna and Z axle antenna.
When LF transmitter 12(low frequency) when detecting trigger 4 inputs, will send the 125KHZ message of a coding.Any key part in this range of signal all can receive this message, and the coded data field is verified.If LF transmitter 12 is identified, will send a RF (433.92MHZ) KEELOQ coding message.21 pairs of these packets of RF receiver are decoded, if be identified, will operate accordingly.For reducing current drain, LF transmitter 12 can not continue the key part 1 in the poll remote controller, and the button 14 of security door handle inboard wakes LF transmitter 24 up from park mode or power-down mode.
The key part:
The key partial circuit has three outside LC resonance circuits, three key switches, a 433.92MHZ resonator and a several element that is used for the backup battery pattern that is used for the data transmission.It is main control chip that key partly adopts HCS300, and HCS300 comprises digital MCU part (HCS300 kernel) and three AFE(analog front end)s (AFE) part, can be used for multiple low frequency detection and intelligent both-way communication and uses.Host machine part is sent the command signal of a 125kHz, effective key part around searching.If the order that receives is effective, the key part will be returned a response signal (the RF signal of high frequency).The HCS300 device has three antennas and connects pin.By connecting three antennas that point to X, Y and Z direction, the key part can be accepted the signal from any direction at any time, thereby reduces the possibility that the directionality of antenna is arranged and cause dropout.Each day detection of input signal of wire pin is separate, and addition subsequently.By configuration register is programmed, each input channel can be enabled separately or be forbidden.The passage that is enabled is few more, and the power consumption of device is just more little.
Be to realize the hand-free operation, the key partial continuous waits for and also detects input signal, and this can reduce battery application life.Therefore, for reducing operating current, when three AFE(analog front end)s (AFE) were searched effective input signal, digital MCU part (encoder section) can be in low current mode (park mode).Have only when AFE detects effective input signal digital MCU(encoder section) partly just be waken up.
Below introduce in detail with reference to the accompanying drawings:
Power designs
Main consideration is the high reliability under the low-power consumption situation, the cost of system and the life-span of transmitter and receiver in the design.For transmitter, battery life can meet the demands in 3-5 years.Battery life is also very important for receiving device, because receiving device must always onlinely be intercepted the transmitting terminal data, typical current requires to be no more than 1 mA.A method for designing is that within a certain period of time, receiving terminal guarantees to detect effective transmission signal; For save power to greatest extent, receiver is in other time sleep.
Safety Design
The safety of system also is a main factor of considering.Realize the safety encipher of system data by the safe key chip HCS300 that adopts Microchip company to aim at the use DES algorithm of PKE system design, prevent that the data that send from being stolen copy by malice; Using MC9RS08KA2 to be decrypted with relay at receiving terminal simultaneously controls.
The operating voltage of HCS300 is 2.0-6.3 V, is 28 Bits Serial sign indicating numbers able to programme, 64 bit encryption key assignments, 66 transmission length, 32 frequency hopping codes, 4 key set codes, 2 conditional codes, has the chip of key assignments read protection measure.
DES coding, decoding figure are as shown in Figures 2 and 3.
16 synchronous computer all will change behind each transmission code.It increases with the number of times of button.According to the DES algorithm for encryption, in each code that sends, because the variation of coincidence counter makes that the code of transmission has greater than 50% part different at every turn.How Fig. 2 explanation uses the internal programmable EEPROM of HCS300 in cataloged procedure, have button to press in case encoder detects, and it just reads key assignments immediately, refreshes coincidence counter simultaneously.Button and coincidence counter are handled through AES, and output data is 32 a enciphered message.Carry 32 codes and the serial code of key information and formed whole transmission sign indicating number, will be received part and receive.
Decoded portion is the numeric data code of study transmitting terminal earlier, and study comprises the key assignments that calculates transmitting terminal, deciphers 32 enciphered message and the serial code in the programmable array, coincidence counter and key assignments.In normal operator scheme, the information of the valid format that at every turn receives is all calculated.Whether serial code is used for expression transmission sign indicating number and was learnt.Learnt if send sign indicating number, the decrypted and synchronized counter value verification of its information so, last receiving system is carried out the button operation request.Fig. 3 has represented to use AT24C02 in information that receiving unit receives and its EEPROM(design able to programme) in the relation of stored information.
Radio-frequency receiving-transmitting device and microprocessor characteristic
For can there be higher transmitting power and receiving sensitivity in the assurance system under the situation of lower current consumption, system has selected the MAX1473 receiving chip and the MAX7044 transmitting chip of Maxim company for use.
MAX7044 transmitting chip operating voltage is+2.1-6.0 V the low operating current of 7.7 mA, the start-up time of 250 μ s.Traffic rate can reach 100 kbps, little encapsulation 3 mm * 3 mm, 8 pin SOT23 encapsulation.It has eliminated the problem based on the SAW transmitter design; Adopt crystal structure, bigger modulation depth and frequency response mechanism fast is provided; Reduced Temperature Influence, temperature range can reach-40-125 ℃.
The MAX1473 receiving chip adopts 3.3 V lithium battery power supplies, and 250 μ s start-up times are less than the standby mode operating current of 2.5 μ A, the sensitivity of-114 dBm; Adopt the design of TSSOP 28 pin package.
MC9RS08KA2 is as the high performance-price ratio MCU of the new a integrated a plurality of functions released of Freescale company, has keyboard interrupt and up to the internal clocking of 20 MHz, and 8 modulo counters, 2 KB Flash spaces, 63 byte RAM; Have simultaneously and wait for and 3 kinds of stop modes, the super low-power consumption that satisfies system designs (electric current is less than 1 μ A in the design), and easy 6 pin BDM detail programming interfaces, is convenient to the real-time upgrading of system.Adopt the accurate little pin package of 6 pin DFN in the design, satisfy the small size requirement of system.
Hardware design figure
Button DES hardware encipher partial circuit as shown in Figure 4.Send the part RF front-end circuit as shown in Figure 5.
The receiving unit RF front-end circuit as shown in Figure 6, component parameter such as Figure 10 are listed.The receiving unit microprocessor control circuit as shown in Figure 7.
The software design
The coding encrypting operating process as shown in Figure 8.
If there is button to press, HCS300 will be waken up, and disappear by 10 ms time-delay simultaneously and tremble.Coincidence counter, descriptor, the key information formation frequency hopping code that is encoded.Each transmission frequency hopping code all can be different, even if same button is pressed, the frequency hopping code that sends in 64K button process can not repeat yet, and therefore in the long time, the button key information can not be stolen.Press if in the process that sends, detect new button, will reset immediately so, and current code will can not continue to carry out; After leaving button, less than influence, unless there is not button to continue to keep down state, under any circumstance transmission code all can be finished, under the simultaneity factor to code word.
Receiving unit decoding deciphering flow process as shown in Figure 9.
After powering on, MC9RS08KA2 begins to judge whether system has I/O to interrupt producing.If no, then system enters low power sleep mode (stop mode 3); If there is I/O to interrupt producing, enter interruption so, wake MCU up, carry out the deciphering of software DES algorithm simultaneously.If deciphering is unsuccessful, then continue to receive data; If successful decryption is then carried out corresponding relays operation (as opening-closing door etc.), system continues to enter sleep state then.
More than disclosed only be the application's a specific embodiment, but the application is not limited thereto, any those skilled in the art can think variation, all should drop in the application's the protection domain.
Claims (3)
1. intelligent anti-theft door keyless access system, comprise and be located at the host machine part in the security door and be located at the interior key part of remote controller, it is characterized in that, described host machine part comprises trigger, LF transmitter, PKE receiver and execution unit, trigger and LF transmitter link, and execution unit and PKE receiver link:
Described PKE receiver comprises RF receiver, decoder and driver, and decoder is provided with input and connects with the RF receiver, and decoder is provided with output and connects with driver, and driver connects with execution unit; Described key partly comprises RF transmitter, encoder, button and three AFE(analog front end) AFE, described three AFE(analog front end) AFE are provided with antenna and the resonance circuit that is used to receive the LF launcher signal, and encoder is provided with input and three AFE(analog front end) AFE, by key connecting; Encoder is provided with output and connects with the RF transmitter; Be located at the RF receiver and the RF transmitter wireless connections of being located at the key part of host machine part.
2. intelligent anti-theft door keyless access system as claimed in claim 1 is characterized in that the input of decoder connects with trigger, and described trigger comprises the button of being located at security door handle inboard, and described execution unit comprises safe-guard door lock.
3. intelligent anti-theft door keyless access system as claimed in claim 1 is characterized in that, three AFE(analog front end) AFE comprise three antennas and three resonance circuits, and described three antennas are mutually perpendicular X-axis antenna, Y-axis antenna and Z axle antenna.
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CN2010206768661U CN201915717U (en) | 2010-12-23 | 2010-12-23 | Keyless entry system for intelligent security door |
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CN2010206768661U CN201915717U (en) | 2010-12-23 | 2010-12-23 | Keyless entry system for intelligent security door |
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