Intelligent key and TPMS (Tire Pressure Monitoring System) data transmission method and transmission device

Abstract

The invention discloses an intelligent key and a TPMS (Tire Pressure Monitoring System) data transmission method. The method comprises the following steps: the intelligent key generates a first wireless communication frame according to a first frame format; the TPMS generates a second wireless communication frame according to the second frame format; the intelligent key sends a first wireless communication frame according to a first sending rule; the TPMS sends a second wireless communication frame according to a second sending rule; the receiving device circularly operates the three receiving configurations according to the sequence of the first receiving configuration, the third receiving configuration, the second receiving configuration and the third receiving configuration; according to the invention, the operation sequence of the three receiving configurations is reasonably arranged, so that the receiving device can operate the third receiving configuration once every two receiving configurations are operated; the receiving device can run the first receiving configuration and the second receiving configuration once every four times of receiving configuration, so that the signals of the intelligent key and the TPMS can be stably received.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile wireless communication, and in particular relates to a smart key and TPMS data transmission method and a transmission device. Background Art

[0002] As cars are moving towards electronics, wireless communication technology plays an important role, such as keyless systems, tire pressure monitoring systems (TPMS), etc. However, the receivers used by keyless systems and TPMS are often the same. In recent years, smart keys often use frequency hopping technology. For example, each time you press the key, two carrier frequency signals are often sent out, and the tire pressure monitoring system also sends out a carrier frequency signal, resulting in one receiver often having to receive these three signals.

[0003] A general receiver can only receive signals with one characteristic at the same time, such as signals with a certain carrier frequency, encoding format and baud rate. If you want to receive three signals from smart keys and TPMS, the receiver needs to use time-sharing multiplexing and load different configurations so that it can receive the above three signals in time-sharing multiplexing.

[0004] When any of the three signals is transmitted, the receiver must be able to receive them. In order to receive the three signals, the receiver needs three receiving configurations to match the three signals. The receiver cyclically activates the three receiving configurations to match the three signals. When the receiving configuration matches the signal, it stays in this receiving configuration and receives the signal. If there is no signal, the next receiving configuration is started to continue signal matching. The time for the receiver to run a certain receiving configuration is divided into two stages, namely the startup time and the scanning dwell time, which each accounts for about half.

[0005] Existing receivers generally use the method of cyclically enabling three receiving configurations to receive three signals. However, the time it takes for the receiver to fully run these three receiving configurations is longer than the wake-up header (pre-synchronization) time of the TPMS signal frame. As a mechanism for the receiver to identify signals, it is necessary to scan a certain number of wake-up header (pre-synchronization) bits before receiving the subsequent data. Otherwise, it is considered that no valid signal has been scanned and it scans signals with other characteristics instead. In this case, during the time that the TPMS sends the wake-up header bit sequence (pre-synchronization bit sequence), the receiver may not be able to cyclically run to its matching receiving configuration, resulting in the inability to stably receive TPMS signals. Summary of the invention

[0006] The object of the present invention is to provide a smart key and a TPMS data transmission method and a transmission device to solve at least one of the above technical problems.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A smart key and TPMS data transmission method, comprising the following steps:

[0009] The smart key generates a first wireless communication frame according to the first frame format; wherein the first wireless communication frame includes: a first wake-up header bit sequence;

[0010] The TPMS generates a second wireless communication frame according to the second frame format; wherein the second wireless communication frame includes: a second wake-up header bit sequence;

[0011] The smart key sends a first wireless communication frame according to a first sending rule; wherein the first sending rule includes: alternately using a first carrier frequency and a second carrier frequency to transmit the first wireless communication frame multiple times;

[0012] The TPMS sends a second wireless communication frame according to a second sending rule; wherein the second sending rule includes: using a third carrier frequency to transmit the second wireless communication frame multiple times;

[0013] The receiving device receives the first wireless communication frame and the second wireless communication frame according to the receiving rule; wherein the receiving rule includes running three receiving configurations to receive the first wireless communication frame and the second wireless communication frame;

[0014] The three receiving configurations are:

[0015] a first receiving configuration matching a first wireless communication frame transmitted using a first carrier frequency;

[0016] a second receiving configuration matching the first wireless communication frame transmitted using a second carrier frequency;

[0017] a third receiving configuration matched with a second wireless communication frame transmitted using a third carrier frequency;

[0018] The receiving device cyclically runs the three receiving configurations in the order of the first receiving configuration, the third receiving configuration, the second receiving configuration and the third receiving configuration;

[0019] The time taken by the receiving device to complete running the receiving configuration twice is less than the sending time of the second wake-up header bit sequence, and the time taken by the receiving device to complete running the receiving configuration four times is less than the sending time of the first wake-up header bit sequence.

[0020] The present invention reasonably arranges the running order of the three receiving configurations so that the receiving device can run the third receiving configuration once every time it runs the receiving configuration twice, and the time for the receiving device to run the two receiving configurations is less than the sending time of the second wake-up head bit sequence. When the TPMS sends the second wake-up head bit sequence, the receiving device can run to the third receiving configuration that matches the second wireless communication frame transmitted using the third carrier frequency, so that the TPMS signal can be stably received; the receiving device can run the first receiving configuration once and the second receiving configuration once every time it runs the receiving configuration four times, and the time for the receiving device to run the four receiving configurations is less than the sending time of the first wake-up head bit sequence. When the smart key sends the first wake-up head bit sequence, the receiving device can run to the first receiving configuration that matches the first wireless communication frame transmitted using the first carrier frequency and the second receiving configuration that matches the first wireless communication frame transmitted using the second carrier frequency, so that the smart key signal can be stably received.

[0021] Furthermore, the receiving device can only receive a signal of one characteristic at a time.

[0022] Furthermore, the first wireless communication frame further includes: a first synchronization header bit sequence, a first data bit sequence, a first check code bit sequence, and a first stop bit sequence.

[0023] Furthermore, the second wireless communication frame further includes: a second synchronization header bit sequence, a second data bit sequence, a second check code bit sequence, and a second stop bit bit sequence.

[0024] Furthermore, the TPMS sends a pre-synchronization bit sequence before sending the second wireless communication frame.

[0025] Furthermore, the pre-synchronization bit sequence is sent using a third carrier frequency.

[0026] Furthermore, the first sending rule includes: the smart key determines a sending interval duration, and sends a plurality of the first wireless communication frames based on the sending interval duration.

[0027] Furthermore, the second sending rule includes: the TPMS determines a sending interval duration, and sends a plurality of the second wireless communication frames based on the sending interval duration.

[0028] Furthermore, the pre-synchronization bit sequence is all 0s.

[0029] The present invention also provides a smart key and a TPMS data transmission device, based on the above transmission method, comprising:

[0030] The smart key is used to generate and transmit a first wireless communication frame;

[0031] The TPMS is configured to generate and transmit a second wireless communication frame;

[0032] The receiving device is used to receive a first wireless communication frame and a second wireless communication frame.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention reasonably arranges the running order of the three receiving configurations so that the receiving device can run the third receiving configuration once every time it runs the receiving configuration twice, and the time for the receiving device to run the two receiving configurations is less than the sending time of the second wake-up head bit sequence. When the TPMS sends the second wake-up head bit sequence, the receiving device can run to the third receiving configuration that matches the second wireless communication frame transmitted using the third carrier frequency, so that the TPMS signal can be stably received; the receiving device can run the first receiving configuration once and the second receiving configuration once every time it runs the receiving configuration four times, and the time for the receiving device to run the four receiving configurations is less than the sending time of the first wake-up head bit sequence. When the smart key sends the first wake-up head bit sequence, the receiving device can run to the first receiving configuration that matches the first wireless communication frame transmitted using the first carrier frequency and the second receiving configuration that matches the first wireless communication frame transmitted using the second carrier frequency, so that the smart key signal can be stably received. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a flow chart of a smart key and TPMS data transmission method in this embodiment;

[0036] Figure 2 It is a schematic diagram of the receiving device in this embodiment cyclically running three receiving configurations.

[0037] Figure 3 It is a wireframe diagram of a smart key and TPMS data transmission device in this embodiment. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] like Figure 3 As shown, the present invention provides a smart key and a TPMS data transmission device, comprising:

[0040] The smart key is used to generate and transmit a first wireless communication frame;

[0041] The TPMS is configured to generate and transmit a second wireless communication frame;

[0042] The receiving device is used to receive a first wireless communication frame and a second wireless communication frame.

[0043] The transmission device also includes an automotive electronic control unit (ECU), and the ECU also includes a main micro control unit (main MCU). The main MCU is connected to the receiving device, and the receiving device can be a high-frequency signal receiver.

[0044] like Figure 1 As shown, this embodiment also provides a smart key and TPMS data transmission method, including the following steps:

[0045] Step 101: the smart key generates a first wireless communication frame according to a first frame format; wherein the first wireless communication frame includes: a first wake-up header bit sequence;

[0046] The TPMS generates a second wireless communication frame according to the second frame format; wherein the second wireless communication frame includes: a second wake-up header bit sequence;

[0047] Step 102, the smart key sends a first wireless communication frame according to a first sending rule; wherein the first sending rule includes: alternately using a first carrier frequency and a second carrier frequency, and transmitting the first wireless communication frame multiple times;

[0048] The TPMS sends a second wireless communication frame according to a second sending rule; wherein the second sending rule includes: using a third carrier frequency to transmit the second wireless communication frame multiple times;

[0049] Step 103, the receiving device receives a signal according to a receiving rule, the signal including a first wireless communication frame and a second wireless communication frame; wherein the receiving rule includes running three receiving configurations to receive the first wireless communication frame and the second wireless communication frame;

[0050] The three receiving configurations are:

[0051] a first receiving configuration matching a first wireless communication frame transmitted using a first carrier frequency;

[0052] a second receiving configuration matching the first wireless communication frame transmitted using a second carrier frequency;

[0053] a third receiving configuration matched with a second wireless communication frame transmitted using a third carrier frequency;

[0054] like Figure 2 As shown, the receiving device cyclically runs the three receiving configurations in the order of the first receiving configuration, the third receiving configuration, the second receiving configuration and the third receiving configuration;

[0055] The time taken by the receiving device to complete running the receiving configuration twice is less than the sending time of the second wake-up header bit sequence, and the time taken by the receiving device to complete running the receiving configuration four times is less than the sending time of the first wake-up header bit sequence.

[0056] In this embodiment, a wireless communication protocol for data transmission between a vehicle's receiving device and a smart key and TPMS is predefined, which may be a wireless high-frequency communication protocol, etc. The wireless communication protocol specifies a plurality of frame formats; wherein the smart key generates a first wireless communication frame according to a first frame format, and the first wireless communication frame includes: a first wake-up header bit sequence; and the TPMS generates a second wireless communication frame according to a second frame format, and the second wireless communication frame includes: a second wake-up header bit sequence.

[0057] In this embodiment, the receiving device may be a high-frequency signal receiver, etc. The receiving device may be awakened by the first wake-up header bit sequence or the second wake-up header bit sequence. For example, the receiving device may receive the first wake-up header bit sequence sent at the first carrier frequency when running the first receiving configuration, and the receiving device is awakened at this time, and continues to receive subsequent information according to the first receiving configuration; the receiving device may receive the first wake-up header bit sequence sent at the second carrier frequency when running the second receiving configuration, and the receiving device is awakened at this time, and continues to receive subsequent information according to the second receiving configuration; the receiving device may also receive the second wake-up header bit sequence sent at the third carrier frequency when running the third receiving configuration, and the receiving device is awakened at this time, and continues to receive subsequent information according to the third receiving configuration.

[0058] When the receiving device does not receive any signal, it is in a cyclic mode. In the cyclic mode, the receiving device cyclically runs the three receiving configurations in the order of the first receiving configuration, the third receiving configuration, the second receiving configuration and the third receiving configuration to receive the signal.

[0059] When the receiving device receives a signal and is successfully awakened, it is in a working mode. In the working mode, the receiving device continues to receive subsequent signal content according to the current receiving configuration.

[0060] The receiving device is in loop mode when it receives a signal but is not successfully awakened.

[0061] The receiving device pre-acquires and stores the correct first wake-up header bit sequence and the second wake-up header bit sequence for comparison and verification. If the received signal content matches the first wake-up header bit sequence or the second wake-up header bit sequence, and the matching length is sufficient, the verification is successful, the receiving device is awakened, and subsequent signal content reception can be performed; if the received signal content cannot match the first wake-up header bit sequence or the second wake-up header bit sequence, or the matching length is not long enough, the verification fails, the receiving device cannot be awakened, and the receiving device continues the loop mode.

[0062] The present invention reasonably arranges the running order of the three receiving configurations so that the receiving device can run the third receiving configuration once every time it runs the receiving configuration twice, and the time for the receiving device to run the two receiving configurations is less than the sending time of the second wake-up head bit sequence. When the TPMS sends the second wake-up head bit sequence, the receiving device can run to the third receiving configuration that matches the second wireless communication frame transmitted using the third carrier frequency, so that the TPMS signal can be stably received; the receiving device can run the first receiving configuration once and the second receiving configuration once every time it runs the receiving configuration four times, and the time for the receiving device to run the four receiving configurations is less than the sending time of the first wake-up head bit sequence. When the smart key sends the first wake-up head bit sequence, the receiving device can run to the first receiving configuration that matches the first wireless communication frame transmitted using the first carrier frequency and the second receiving configuration that matches the first wireless communication frame transmitted using the second carrier frequency, so that the smart key signal can be stably received.

[0063] Furthermore, the receiving device can only receive a signal of one characteristic at a time.

[0064] Furthermore, the first wireless communication frame further includes: a first synchronization header bit sequence, a first data bit sequence, a first check code bit sequence, and a first stop bit sequence.

[0065] Furthermore, the second wireless communication frame further includes: a second synchronization header bit sequence, a second data bit sequence, a second check code bit sequence, and a second stop bit bit sequence.

[0066] Furthermore, the TPMS sends a pre-synchronization bit sequence before sending the second wireless communication frame.

[0067] Furthermore, the pre-synchronization bit sequence is sent using a third carrier frequency.

[0068] Furthermore, the first sending rule includes: the smart key determines a sending interval duration, and sends a plurality of the first wireless communication frames based on the sending interval duration.

[0069] Furthermore, the second sending rule includes: the TPMS determines a sending interval duration, and sends a plurality of the second wireless communication frames based on the sending interval duration.

[0070] Some receiving devices will enter an idle state (waiting for the host to process data) after receiving a frame of data. At this time, the receiving device cannot receive data. By adding gap time between multiple wireless communication frames (TS) to allow the receiving device time to process the previous frame of data and reopen the receiving device to receive the next frame of data, the stability of transmission can be guaranteed.

[0071] Furthermore, the pre-synchronization bit sequence is all 0s, and after transmitting the pre-synchronization bit sequence, the TPMS transmits the second wireless communication frame three times; a transmission interval is also left between the transmission of the pre-synchronization bit sequence and the transmission of the second wireless communication frame; the time required for the transmission of the pre-synchronization bit sequence is 50ms, and the time required for the transmission of the second wake-up header bit sequence in the second wireless communication frame is 1.56ms, and the time required for the receiving device to complete each of the three receiving configurations is the same; the time required for the receiving device to complete two receiving configurations is less than the time required for the transmission of the second wake-up header bit sequence in the second wireless communication frame, and the time required for the receiving device to complete three receiving configurations is greater than the time required for the transmission of the second wake-up header bit sequence in the second wireless communication frame, that is, the time required for the receiving device to complete two receiving configurations is less than 1.56ms, and the time required for the receiving device to complete three receiving configurations is greater than 1.56ms.

[0072] It should be noted that although the present invention is disclosed as above by specific embodiments, the above embodiments are not intended to limit the present invention. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A smart key and TPMS data transmission method, characterized in that: The following steps are involved: The smart key generates a first wireless communication frame according to the first frame format; wherein the first wireless communication frame includes: a first wake-up header bit sequence; The TPMS generates a second wireless communication frame according to the second frame format; wherein the second wireless communication frame includes: a second wake-up header bit sequence; The smart key sends a first wireless communication frame according to a first sending rule; wherein the first sending rule includes: alternately using a first carrier frequency and a second carrier frequency to transmit the first wireless communication frame multiple times; The TPMS sends a second wireless communication frame according to a second sending rule; wherein the second sending rule includes: using a third carrier frequency to transmit the second wireless communication frame multiple times; The receiving device receives the first wireless communication frame and the second wireless communication frame according to the receiving rule; wherein the receiving rule includes running three receiving configurations to receive the first wireless communication frame and the second wireless communication frame; The three receiving configurations are: a first receiving configuration matching a first wireless communication frame transmitted using a first carrier frequency; a second receiving configuration matching the first wireless communication frame transmitted using a second carrier frequency; a third receiving configuration matched with a second wireless communication frame transmitted using a third carrier frequency; The receiving device cyclically runs the three receiving configurations in the order of the first receiving configuration, the third receiving configuration, the second receiving configuration and the third receiving configuration; The time taken by the receiving device to complete running the receiving configuration twice is less than the sending time of the second wake-up header bit sequence, and the time taken by the receiving device to complete running the receiving configuration four times is less than the sending time of the first wake-up header bit sequence.

2. The smart key and TPMS data transmission method according to claim 1, characterized in that: The receiving device can only receive a signal of one characteristic at a time.

3. The smart key and TPMS data transmission method according to claim 1, characterized in that: The first wireless communication frame further includes: a first synchronization header bit sequence, a first data bit sequence, a first check code bit sequence, and a first stop bit sequence.

4. The smart key and TPMS data transmission method according to claim 1, characterized in that: The second wireless communication frame further includes: a second synchronization header bit sequence, a second data bit sequence, a second check code bit sequence, and a second stop bit sequence.

5. The smart key and TPMS data transmission method according to claim 1, characterized in that: The TPMS first sends a pre-synchronization bit sequence before sending the second wireless communication frame.

6. The smart key and TPMS data transmission method according to claim 5, characterized in that: The pre-synchronization bit sequence is sent using a third carrier frequency.

7. The smart key and TPMS data transmission method according to claim 1, characterized in that: The first sending rule includes: the smart key determines a sending interval duration, and sends a plurality of the first wireless communication frames based on the sending interval duration.

8. The smart key and TPMS data transmission method according to claim 1, characterized in that: The second sending rule includes: the TPMS determines a sending interval duration, and sends a plurality of the second wireless communication frames based on the sending interval duration.

9. The smart key and TPMS data transmission method according to claim 5, characterized in that: The pre-synchronization bit sequence is all 0s.

10. A smart key and TPMS data transmission device, based on any transmission method in claims 1-9, characterized in that: include: The smart key is used to generate and transmit a first wireless communication frame; The TPMS is configured to generate and transmit a second wireless communication frame; The receiving device is used to receive a first wireless communication frame and a second wireless communication frame.

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