CN111968272A - Data transmission method and device for remote control access control system - Google Patents
Data transmission method and device for remote control access control system Download PDFInfo
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- CN111968272A CN111968272A CN202010866092.7A CN202010866092A CN111968272A CN 111968272 A CN111968272 A CN 111968272A CN 202010866092 A CN202010866092 A CN 202010866092A CN 111968272 A CN111968272 A CN 111968272A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000005540 biological transmission Effects 0.000 title claims abstract description 24
- 230000008859 change Effects 0.000 claims description 9
- 230000002618 waking effect Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 230000005059 dormancy Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 1
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00571—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by interacting with a central unit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/002—Locking of control actuating or transmitting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/20—Means to switch the anti-theft system on or off
- B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
- B60R25/243—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user with more than one way to gain access
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00896—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys specially adapted for particular uses
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
- G07C2009/00365—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks in combination with a wake-up circuit
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
- G07C2009/00412—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks the transmitted data signal being encrypted
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lock And Its Accessories (AREA)
- Selective Calling Equipment (AREA)
Abstract
The invention provides a data transmission method and a data transmission device for a remote access control system, wherein the method comprises the steps of detecting the key state of a remote key; and when the key state of the remote control key meets the preset triggering condition, the wakeup frame containing the wakeup data, the synchronous frame containing the synchronous data and the data frame containing the key state are sent out in sequence, the duration of the wakeup frame is longer than the self-wakeup period of the receiving chip of the vehicle door controller, the condition that the receiving chip cannot be awakened when receiving the wakeup frame in the dormant state is avoided, and the reliability of awakening the receiving chip of the vehicle door controller every time is further ensured. Compared with the existing wake-up mode, the wake-up frame wake-up mode has simple logic. Furthermore, the data frame is sent out only when the key state is continuously and repeatedly acquired to be effective, so that the accuracy of the key state in the sent data frame is improved. The method reduces the key pressing error caused by electromagnetic interference and the like, and sends out wrong instructions.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a data transmission method and device of a remote access control system.
Background
The RKE (Remote key Entry) has a working principle that a Remote key transmits information to a door controller through a specific frame format, and the door controller decrypts a data frame and judges the correctness of the data after receiving the information, thereby completing a corresponding command action. In order to reduce power consumption, the vehicle door controller enters a low power consumption state after receiving no data of the remote control key for a long time; it needs to be woken up before sending instructions to the door controller to ensure proper command parsing and response. The existing wake-up mode detects a valid flag in a data frame as a wake-up signal, and the wake-up mode has complex logic and risks that a vehicle door controller cannot be woken up when the data frame is distorted.
Disclosure of Invention
In view of this, the present invention provides a data transmission method and apparatus for a remote access control system, in order to improve the success rate of waking up a receiving chip of a door controller.
In order to achieve the above object, the following solutions are proposed:
in a first aspect, a method for transmitting data of a remote access control system is provided, including:
detecting the key state of the remote control key;
when the key state meets a preset trigger condition, a wake-up frame containing wake-up data, a synchronization frame containing synchronization data and a data frame containing the key state are sequentially sent out, the duration of the wake-up frame is longer than the self-wake-up period of a receiving chip of the vehicle door controller, the wake-up frame is used for waking up the receiving chip of the vehicle door controller, and the synchronization frame is used for distinguishing the wake-up frame from the data frame.
Optionally, the preset trigger condition includes:
and the frequency of continuously detecting that the key state is effective reaches a preset frequency threshold value, wherein the frequency threshold value is at least 2.
Optionally, the sent data frame is: and at least two frames, wherein the data frames of the two frames comprise preset frame interval time.
Optionally, the encoding mode of the data in the data frame is as follows:
manchester encoding.
Optionally, the data frame includes:
the key state and the remote access control system serial number are contained in the unencrypted information and the encrypted information.
Optionally, the data frame further includes:
and the count value of the key state change is encrypted information.
In a second aspect, a data transmission device for a remote access control system is provided, which includes:
the key state detection unit is used for detecting the key state of the remote control key;
and the data sending unit is used for sequentially sending a wake-up frame containing wake-up data, a synchronization frame containing synchronization data and a data frame containing the key state when the key state meets a preset trigger condition, wherein the duration of the wake-up frame is longer than the self-wake-up period of a receiving chip of the vehicle door controller, the wake-up frame is used for waking up the receiving chip of the vehicle door controller, and the synchronization frame is used for distinguishing the wake-up frame from the data frame.
Optionally, the preset trigger condition includes:
and the frequency of continuously detecting that the key state is effective reaches a preset frequency threshold value, wherein the frequency threshold value is at least 2.
Optionally, the sent data frame is: and at least two frames, wherein the data frames of the two frames comprise preset frame interval time.
Optionally, the encoding mode of the data in the data frame is as follows:
manchester encoding.
Optionally, the data frame includes:
the key state and the remote access control system serial number are contained in the unencrypted information and the encrypted information.
Optionally, the data frame further includes:
and the count value of the key state change is encrypted information.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the invention provides a data transmission method and a data transmission device for a remote access control system, wherein the method comprises the steps of detecting the key state of a remote key; and when the key state of the remote control key meets the preset triggering condition, the wakeup frame containing the wakeup data, the synchronous frame containing the synchronous data and the data frame containing the key state are sent out in sequence, the duration of the wakeup frame is longer than the self-wakeup period of the receiving chip of the vehicle door controller, the condition that the receiving chip cannot be awakened when receiving the wakeup frame in the dormant state is avoided, and the reliability of awakening the receiving chip of the vehicle door controller every time is further ensured. Compared with the existing wake-up mode, the wake-up frame wake-up mode has simple logic.
Further, the triggering condition is set to be that the number of times of continuously detecting that the key state is valid reaches a preset number threshold, and the number threshold is at least 2. The data frame is sent out only when the key state is continuously and repeatedly acquired to be effective, so that the accuracy of the key state in the sent data frame is improved. The method reduces the key pressing error caused by electromagnetic interference and the like, and sends out wrong instructions.
And furthermore, at least two frames of data frames are sent out, so that the stability of sending the data frames to the vehicle door controller is improved, namely, the probability of receiving the data frames by the vehicle door controller is improved.
Still further, the data frame includes a count value of the change of the key state, and the count value is encrypted information, so that the vehicle door controller can judge whether the data frame is legal or not according to the count value, and the safety of the remote access control system is improved.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a data transmission method for a remote access control system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a wake-up frame according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a sync field according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a data frame according to an embodiment of the present invention;
fig. 5 is a schematic diagram of transmitting a multi-frame data frame according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a data transmission device of a remote access control system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a method for transmitting data of a remote access control system according to the present invention is applied to a remote key terminal, and the method includes the following steps:
step S11: the key state of the remote control key is detected.
The remote control access control system has the working principle that the remote control key sends information to the vehicle door controller through a specific frame format, and the vehicle door controller decrypts the data frame and judges the correctness of the data after receiving the information to complete the corresponding command action. And detecting the key state of the remote control key so as to send out a data frame containing the key state when the key state of the remote control key meets a preset trigger condition. The key states of the key fob include valid and invalid.
S12: and when the key state of the remote control key meets a preset trigger condition, sequentially sending an awakening frame containing awakening data, a synchronous frame containing synchronous data and a data frame containing the key state.
In order to reduce the current consumption of the door controller in the dormant state, the receiving chip of the door controller is also operated in a low power consumption mode. When the receiving chip of the vehicle door controller is in the low power consumption mode, the receiving chip operates in a cycle of awakening inquiry, dormancy and awakening inquiry, and only when the receiving chip receives effective awakening data in the awakening inquiry state, the receiving chip can exit from the low power consumption mode, so that the main chip of the vehicle door controller is awakened. In the method provided by the invention, the wake-up frame is used for waking up the receiving chip of the vehicle door controller, the duration of the wake-up frame is longer than the self-wake-up period of the receiving chip of the vehicle door controller, namely, the total time of wake-up inquiry and dormancy, the situation that the receiving chip cannot be woken up because the receiving chip receives the wake-up frame in the dormancy state is avoided, and the reliability of waking up the vehicle door controller every time is further ensured. Compared with the existing wake-up mode, the wake-up mode adopting the wake-up frame has simple and stable logic. The synchronization frame is used to distinguish the wake-up frame from the data frame. The synchronous field is used for data synchronization, the correctness of a decoding starting end is ensured, and errors of decoding data caused by phase deviation are prevented.
In the low power mode, the door controller needs to detect a specific signal format as a wake-up flag to make itself enter a normal state, and then execute the RKE command. The current wake-up modes of the automobile electronic field controller are generally divided into two modes, namely interrupt wake-up and inquiry wake-up. Whether the wake-up is interrupted or inquired, a self-wake-up period exists, and stable wake-up can be ensured only when the wake-up duration is longer than the self-wake-up period. Therefore, the duration of the awakening frame sent by the method is longer than the self-awakening period of the receiving chip of the vehicle door controller.
In the process of implementing the invention, the inventor finds that the key of the remote control key is easy to be mistakenly effective due to the reasons of too short filtering time, electromagnetic interference and the like, so that if the triggering condition is set to be that the subsequent data sending process is carried out when the key state of the remote control key is detected to be effective, an error instruction is easy to be sent out. In order to solve the technical problem, in some embodiments, the triggering condition is set to a preset threshold value of the number of times that the key state of the key fob is continuously detected to be valid, where the threshold value of the number of times is at least 2.
The key state collection is performed for a plurality of times within a period of time, for example, every 10ms within 50ms, 5 times in total, and if the key state of any one time in the five collected key states is invalid, the key state is judged to be invalid. Therefore, the preset times can be repeatedly acquired when the key state is detected every time, and the accuracy of key state acquisition is improved. The conditions that the keys are mistakenly effective and wrong instructions are sent out due to electromagnetic interference and the like are reduced.
In the past, data encoding method of data frame usually adopts three Te to represent one data bit mode, wherein Te is the minimum unit of level duration. Specifically, two high levels and one low level are used to represent a logic 1, and one high level and two low levels are used to represent a logic 0. The coding mode has low bandwidth occupancy rate and low efficiency. In some embodiments of the present invention, in order to improve the data transmission efficiency, a manchester coding mode is adopted to code the data in the data frame, that is, a jump is made in the middle of each bit, and the jump in the middle of the bit is used as both a clock signal and a data signal; the transition from high to low represents a "1" and the transition from low to high represents a "0".
Fig. 2 is a schematic diagram of a wake-up frame provided in this embodiment, where the duty cycle is 50%, the period is 1ms, and the total time is 200 ms. Fig. 3 is a schematic diagram of a sync field provided in this embodiment, where the duty cycle is 50%, and the total time, i.e., the duration, is 4 ms. Because clutter exists in the air, high energy exists in a high level, the high energy is a stable propagation mode, but the power consumption is high; low level power consumption is low but is greatly affected by clutter; therefore, the present embodiment provides high and low levels with 50% duty cycle as the sync field, taking power consumption and stability requirements into consideration. Fig. 4 is a schematic diagram of a data frame provided in this embodiment, where the data frame includes a frame header, plaintext data, and ciphertext data.
The header is at a high level and a low level with a 50% duty cycle and is used for detecting the start of the data frame.
The plaintext data is unencrypted information including reset bits, power, key status, and serial number. Wherein, the repeated position is used for indicating whether the key is long-pressed, if the key is pressed all the time, the position is 1, otherwise, the position is 0; the power is used for indicating a low power state, if the power is low, the position is 1, and the power is normal, the position is 0; the key state is 4 bits, each Bit indicates the key state of one key, and the key state is set to be 1 in an effective mode and 0 in an ineffective mode; the serial number is the serial number of the remote access control system, namely the serial number information of the remote access control system, and is used for comparing with the serial number information of the ciphertext.
The ciphertext data is encrypted information, and may specifically be information encrypted by an AES algorithm. The cipher text includes a vendor code, a serial number, a reservation, a key state, and a key count. The manufacturer code is data obtained by encrypting user-defined information; the serial number is encrypted data of serial number information in a plaintext; reserved means not used here; the key state is encrypted data of the key state in a plaintext; the key count is a count value of the change in key state.
The data adopts an AES encryption method. And the vehicle door controller decrypts the ciphertext by adopting a corresponding method and compares the decrypted serial number and the key state with plaintext information. The data frame comprises plaintext data and ciphertext data, and the plaintext data comprises a sequence number and key information; the cipher text data has a key count in addition to the serial number and the key information. Because the plaintext can be intercepted and the information of the plaintext can be acquired, the ciphertext data can change every time along with the change of the key counting. The plaintext and the decrypted ciphertext are compared and judged to ensure that the RKE is a non-simulated RKE and ensure the safety.
The key state is changed once, the key count is increased by 1, i.e., the key count is increased as the key count is increased, and the key count is stored in FLASH. And after the key state is changed, acquiring the key count from the FLASH when generating the data frame. The door controller receives the data frame each time, and judges whether the data frame is legal or not through the key counting, so that the safety of the remote access control system is improved. For example, a data frame sent by the RKE at a time is intercepted, and some attempt to simulate the RKE using the data frame; and at the moment, the key count is updated, the vehicle door controller judges the key count in the data frame simulating the RKE, and the data frame is abandoned in an invalid state, so that the safety is ensured.
In order to improve the stability of the data frame transmitted to the door controller, i.e. to improve the probability of the data frame being received by the door controller, at least two frames may be transmitted when transmitting the data frame. And a frame interval time is also set between the two transmitted data frames, as shown in fig. 5, three frame data frames are transmitted, the total time of the wakeup frame is 200ms, and the duty ratio is 50%; the total time of the synchronous frame is 4ms, and the duty ratio is 50 percent; the total time of the data frame is 33.2ms, and the duty ratio is less than 50%; the frame interval is low. The total duty cycle of the wakeup frame, the sync frame, and the data frame is (200ms × 50% +4ms × 50% +33.2ms × duty cycle of the data frame × number of frames of the data frame)/(200 ms +4ms +33.2ms × number of frames of the data frame + total number of frame intervals × frame interval time).
As can be seen from the above formula analysis of the total duty ratio, when a frame of data is transmitted, the frame interval is 0, and the duty ratio is the largest, i.e., the proportion of high level is the largest. When the number of frames of the transmitted data frame is determined, the Duty value (Duty ratio) may be adjusted by adjusting the frame interval time to adjust the power consumption.
It should be noted that, when a multi-frame data frame is transmitted, a situation that the key status changes after one frame is transmitted may occur, at this time, the key status needs to be updated to the latest status immediately, the condition for transmitting multiple frames is counted again, and the previous setting for transmitting multiple frames of data frames is not performed any more. That is, after sending a frame of data each time, the key state is detected again and compared with the previous key state. And if the key state is not changed, continuing to transmit the data frame. If the key state changes, the key state and the key count are immediately updated, and the data frame is retransmitted.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention.
The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details which are not disclosed in the embodiments of the apparatus of the present invention, reference is made to the embodiments of the method of the present invention.
Fig. 6 shows a data transmission device of a remote access control system according to an embodiment of the present invention, which includes a key state detection unit 61 and a data transmission unit 62.
And a key state detection unit 61 for detecting a key state of the key fob.
The data sending unit 62 is configured to send out a wakeup frame including wakeup data, a synchronization frame including synchronization data, and a data frame including a key status in sequence when the key status of the key fob meets a preset trigger condition. The duration of the wake-up frame is longer than the self-wake-up period of the receiving chip of the vehicle door controller, the wake-up frame is used for waking up the receiving chip of the vehicle door controller, and the synchronization frame is used for distinguishing the wake-up frame from the data frame.
In some embodiments, the preset trigger condition includes: the frequency of continuously detecting that the key state is effective reaches a preset frequency threshold value, and the frequency threshold value is at least 2.
In some embodiments, the data frame sent is: and at least two frames, wherein the two frames of data comprise a preset frame interval time.
In some embodiments, the data in the data frame is encoded in the following manner: manchester encoding.
In some embodiments, the data frame comprises: the system comprises unencrypted information and encrypted information, wherein the unencrypted information and the encrypted information both comprise key states and remote access control system serial numbers.
In some embodiments, the data frame further comprises: and the count value of the key state change is encrypted information.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are mainly described as different from other embodiments, the same and similar parts in the embodiments may be referred to each other, and the features described in the embodiments in the present description may be replaced with each other or combined with each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A data transmission method of a remote access control system is characterized by comprising the following steps:
detecting the key state of the remote control key;
when the key state meets a preset trigger condition, a wake-up frame containing wake-up data, a synchronization frame containing synchronization data and a data frame containing the key state are sequentially sent out, the duration of the wake-up frame is longer than the self-wake-up period of a receiving chip of the vehicle door controller, the wake-up frame is used for waking up the receiving chip of the vehicle door controller, and the synchronization frame is used for distinguishing the wake-up frame from the data frame.
2. The remote access control system data transmission method of claim 1, wherein the preset trigger condition comprises:
and the frequency of continuously detecting that the key state is effective reaches a preset frequency threshold value, wherein the frequency threshold value is at least 2.
3. The remote access control system data transmission method according to claim 1, wherein the data frames sent are: and at least two frames, wherein the data frames of the two frames comprise preset frame interval time.
4. The remote access control system data transmission method according to claim 1, wherein the data in the data frame is encoded in a manner of:
manchester encoding.
5. The remote access control system data transmission method of claim 1, wherein the data frame comprises:
the key state and the remote access control system serial number are contained in the unencrypted information and the encrypted information.
6. The data transmission method of the remote access control system according to any one of claims 1 to 5, wherein the data frame further comprises:
and the count value of the key state change is encrypted information.
7. The utility model provides a remote control access control system data transmission device which characterized in that includes:
the key state detection unit is used for detecting the key state of the remote control key;
and the data sending unit is used for sequentially sending a wake-up frame containing wake-up data, a synchronization frame containing synchronization data and a data frame containing the key state when the key state meets a preset trigger condition, wherein the duration of the wake-up frame is longer than the self-wake-up period of a receiving chip of the vehicle door controller, the wake-up frame is used for waking up the receiving chip of the vehicle door controller, and the synchronization frame is used for distinguishing the wake-up frame from the data frame.
8. The remote access control system data transmission device of claim 7, wherein the preset trigger condition comprises:
and the frequency of continuously detecting that the key state is effective reaches a preset frequency threshold value, wherein the frequency threshold value is at least 2.
9. The remote access control system data transmission device of claim 7, wherein the data frames sent are: and at least two frames, wherein the data frames of the two frames comprise preset frame interval time.
10. The remote access control system data transmission device according to any one of claims 7 to 9, wherein the data frame further comprises:
and the count value of the key state change is encrypted information.
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