CN201321015Y

CN201321015Y - Remote control key-free log-on system transmitting terminal apparatus

Info

Publication number: CN201321015Y
Application number: CNU2008201618302U
Authority: CN
Inventors: 陈洪元; 吴凌鸿; 陈恬; 杜林�; 张娟; 贺永俊
Original assignee: NANJING TACKING AUTOMOBILE ELECTRONIC CO Ltd
Current assignee: NANJING TACKING AUTOMOBILE ELECTRONIC CO Ltd
Priority date: 2008-10-14
Filing date: 2008-10-14
Publication date: 2009-10-07
Anticipated expiration: 2018-10-14

Abstract

The utility model discloses a remote control key-free log-on system transmitting terminal apparatus, which comprises a microcontroller, an encrypt unit, a radio-frequency emission module and a low-frequency emission and receiving module, wherein both the microcontroller and the encrypt unit are connected with the other two portions, the other two portions are mutually independent, the microcontroller, the encrypt unit and each function module realize real-time data transmissions, the microcontroller executes real-time collections to switch signals and transmits preliminarily designed function codes through a high-frequency emission module after the preliminarily designed function codes being encrypted through the encrypt unit, and the low-frequency emission and receiving module realizes real-time data communication with corresponding modules within short distances to achieve a theft-prevention function of an engine. The utility model integrates an engine theft-prevention locking system and a remote control door locking function and realizes a maximum space volume reduction, power consumption decrease and cost lowering on the premises of a hardware circuit combining the two functions into one function.

Description

A kind of remote keyless enters system's transmitting end device

Technical field

The utility model relates to a kind of automobile and enters the system field with remote keyless, relates in particular to a kind of remote keyless and enters system's transmitting end device.

Background technology

Current, many automakers offer the increasing numerical information of client by peculiar automobile key.And this unique key offers an a kind of high safety of client level easily, and shows its distinguished individual character and different subordinate relation, more has a kind of its to have a kind of symbol senior, luxurious car.

Along with science and technology is brought in constant renewal in and development, the antitheft smart electronics scheme of using on the automobile is also various in style, wherein a kind of mode is that remote keyless enters the RKE of system (Remote Keyless Entry), at present to enter technology the most general in the application of automotive field for remote keyless, and the most vehicles on the market from the top grade to the low grade have all possessed this function.But because the RKE circuit that adopts on the market has used surface acoustic wave (SAW) device to produce the RF carrier wave of projector and the local oscillator (LO) of receptor.Its shortcoming is: the uncertainty of SAW device original frequency is at least ± 100kHz, and it is relatively poor relatively to vary with temperature its frequency stability.At receiving end, if the IF passband is wide, then when reception carrier, can receive too much noise, thereby limit the distance of vehicle response key control signal.And traditional mode energy consuming ratio is bigger, and chip and peripheral circuit taking up space very can not satisfy the portable requirement of key, and the manufacturing cost of traditional approach is also higher relatively, and performance is also unstable relatively.

The utility model content

The technical matters that the utility model solved provides a kind of key space that reduces, save the key power consumption, reduce the key cost, improve the key performance, the remote keyless of RKE and engine anti-theft function Immo (Immobilization Solution) combination is entered system's transmitting end device.

The technical solution of the utility model is: a kind of remote keyless enters system's transmitting end device, comprise microcontroller and ciphering unit, radiofrequency emitting module, low frequency transceiver module, microcontroller all links to each other with other two parts with ciphering unit, and other two parts are separate; Wherein the radical function of radiofrequency emitting module is that data message is sent to the receiving end that is fixed on the car body by rf carrier, the radical function of low frequency transceiver module be with data message by low frequency carrier signal carry out with car body on sending and receiving end intercommunication data message, the radical function of microcontroller and ciphering unit be with the button switch functional information corresponding by cryptographic algorithm after rf carrier sends to the receiving element on the car body, secondly be with car body on the low frequency Transmit-Receive Unit carry out information mutual communication.

The utility model adopts the integrated design of single-chip height, and the periphery circuit design of simplification has strengthened the system signal antijamming capability; The emitter precision of hardware circuit is also by adopting crystal oscillator PLL mode to be improved; Adopted 8 MRKII frameworks of low-power consumption risc processor, and integrated UHF emitter, all authentication operations can under no power supply state, be finished.

Microcontroller of the present utility model and ciphering unit and each functional module are carried out real-time data and are transmitted, and microcontroller is gathered in real time to on-off signal, and the design-calculated function code sends by the high-frequency emission module after encrypting by ciphering unit in advance.The low frequency transceiver module then is in short range and cooresponding module is carried out real-time data communication, to reach the function to engine anti-theft.Integrated anti-theft locking system of engine and remote control gate lock function in the design, and hardware circuit of the present utility model is under precondition that two functions are combined together, the maximized spatial volume that dwindles, the maximized power consumption that reduces, maximized cost-cutting.

Description of drawings

Fig. 1 is the utility model scheme drawing.

Fig. 2 is the utility model master chip peripheral circuit diagram.

Fig. 3 is the utility model emission of radio frequency signals terminal circuit figure.

Fig. 4 is the utility model low frequency signal sending and receiving end circuit diagram.

The specific embodiment

With reference to Fig. 1, Fig. 2 and Fig. 3, a kind of remote keyless enters system's transmitting end device, comprise microcontroller and ciphering unit 1, radiofrequency emitting module 2, low frequency transceiver module 3, microcontroller and ciphering unit and each functional module are carried out real-time data and are transmitted, microcontroller is gathered in real time to on-off signal, and the design-calculated function code is encrypted the back by the transmission of high-frequency emission module by ciphering unit in advance.The low frequency transceiver module then is in short range and cooresponding module is carried out real-time data communication, to reach the function to engine anti-theft.

For cost and the space that reaches key minimizes, the master chip of this device adopts the PCF7946 at grace intelligence Pu, this chip can be integrated in IMMO and RKE function height in the less space, and actv. has reduced peripheral chip and circuit, thereby is minimized the cost of development of system.For improving the precision of projector, the hardware using of this device substitutes the scheme of SAW device based on the phaselocked loop (PLL) of crystal.The use of PLL mainly is derived from strict day by day RF radiation rule, uses the projector of crystal oscillator PLL to improve ten times than the projector precision of using the SAW resonator is general.For realizing the combination of IMMO and RKE function, adopt HITAG2 and automobile-used remote control gate lock responser in the device, combine existing HITAG device through the anti-theft and safety function of checking and the convenience of remote control gate lock.Purpose for the saving power consumption of realization system, adopt 8 MRKII frameworks of low-power consumption risc processor in the device simultaneously, integrated UHF emitter can be finished all authentication operations under no power supply state, support the FLASH similar programming process of programming, be beneficial to the realization system upgrade.

Describe the utility model workflow in detail below in conjunction with accompanying drawing.

Among the design, whole module will be powered by reserve battery, the button switch that the user presses on the key chain gets final product triggering system work, wake key in-to-in microcontroller and ciphering unit 1 up, microcontroller and ciphering unit 1 are processed into cooresponding control signal with the push button signalling of gathering and it are carried out rolling code encrypt, then command information is modulated to high-frequency signal and is sent to radiofrequency emitting module 2, X1 externally sends by antenna.In the time of in key is in low frequency operation effective communication scope, the low frequency signal of car body controller BCM will receive by low frequency transceiver module 3, then activation signal is sent to the anti-theft locking system of engine that microcontroller and ciphering unit 1 activates in the key, the authentication information of microcontroller will send to car body controller BCM by the low frequency signal transceiver module and carry out authentication and information exchange to realize the engine anti-theft function.

Claims

1, a kind of remote keyless enters system's transmitting end device, it is characterized in that: comprise microcontroller and ciphering unit (1), radiofrequency emitting module (2), low frequency transceiver module (3), microcontroller all links to each other with other two parts with ciphering unit (1), and other two parts are separate; Wherein the radical function of radiofrequency emitting module (2) is that data message is sent to the receiving end that is fixed on the car body by rf carrier, the radical function of low frequency transceiver module (3) be with data message by low frequency carrier signal carry out with car body on sending and receiving end intercommunication data message, the radical function of microcontroller and ciphering unit (1) be with the button switch functional information corresponding by cryptographic algorithm after rf carrier sends to the receiving element on the car body, secondly be with car body on the low frequency Transmit-Receive Unit carry out information mutual communication.

2, remote keyless according to claim 1 enters system's transmitting end device, it is characterized in that: switch (SW1) in described microcontroller and the ciphering unit (1), (SW2) link to each other with power supply ground with the input end of the parallel-connection structure body of (SW3), the mouth of three switches is connected respectively to microcontroller P11, P10 and P16 port, and the mouth of three switches is distinguished series resistance (R2 again, R3, R4), power connection positive pole again then, the P14 end of microcontroller and ciphering unit (1) is connected resistance (R1) input end, resistance (R1) mouth connects LED lamp (V1), LED lamp (V1) other end connects positive source, the VFLD end of microcontroller and ciphering unit (1) is connected electric capacity (C3) input end, electric capacity (C3) mouth connects ground, the VSSA end of microcontroller and ciphering unit (1), the VSSPA end, the VSS port is ground connection respectively, the P21 of microcontroller and ciphering unit (1), P22, the P15 port is the power connection positive pole respectively.

3, remote keyless according to claim 1 enters system's transmitting end device, it is characterized in that: ground connection after inductance (L2) mouth is connected with electric capacity (C6) in the described radiofrequency emitting module (2), and inductance (L2) mouth links to each other with antenna (X1) input end, antenna (X1) mouth is connected with the parallel-connection structure body of inductance (L3) and electric capacity (C7), electric capacity (C7) output head grounding, the anodal and ground connection afterwards of connect with electric capacity (C8) of inductance (L3) mouth power connection.

4, remote keyless according to claim 1 enters system's transmitting end device, it is characterized in that: inductance (L1) and electric capacity (C2) parallel connection in the described low frequency transceiver module (3), parallel-connection structure body input/output terminal is connected with the corresponding port of microcontroller with ciphering unit (1) respectively.