A detection system for vehicle-mounted Ethernet link synchronization signal

Abstract

The present invention relates to the field of vehicle-mounted Ethernet communication technology, and specifically to a detection system for a vehicle-mounted Ethernet link synchronization signal, comprising: a signal feature discrimination module, the signal feature discrimination module generates a synchronization mode identifier according to the signal feature of the synchronization signal; a rate discrimination module, the rate discrimination module generates a working rate identifier according to the synchronization signal; a synchronization module, the synchronization module is respectively connected to the signal feature discrimination module and the rate discrimination module, and the synchronization module generates and outputs synchronization information for handshake between the vehicle-mounted Ethernet device and the external device according to the synchronization mode identifier and the working rate identifier. The beneficial effect is that: in view of the problem that the parallel detection scheme in the prior art is not effective, in this embodiment, by respectively constructing a signal feature discrimination module and a rate discrimination module in the detection system, the synchronization signal is discriminated based on the working mode and working rate corresponding to the signal feature, thereby achieving a better detection effect on multiple synchronization signals.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted Ethernet communication, and in particular to a detection system for a vehicle-mounted Ethernet link synchronization signal. Background Art

[0002] In-vehicle Ethernet is a new LAN technology that uses Ethernet to connect the electronic control unit (ECU) in the car. Unlike ordinary Ethernet technology that uses 4 pairs of unshielded twisted pair cables to transmit data, in-vehicle Ethernet can achieve a data transmission rate of 100Mb / s or even 1Gb / s on a single pair of unshielded twisted pair cables. Compared with ordinary Ethernet, it can better adapt to the vehicle environment and meet the automotive industry's requirements for high reliability, low electromagnetic radiation, low power consumption, bandwidth allocation, low latency, and synchronous real-time performance.

[0003] In the prior art, for in-vehicle Ethernet devices, there are different handshake modes, including auto-negotiation mode and forced mode, depending on the parameters of each manufacturer and device. In order to achieve better compatibility with different handshake protocols, Ethernet devices usually configure corresponding signal detection methods to determine the communication method that the opposite device can adopt by detecting the corresponding signal.

[0004] However, in the actual implementation process, the inventors found that with the development of vehicle Ethernet equipment and the iteration of communication standards, the communication rates and standards that vehicle Ethernet equipment may support have gradually expanded from the original 100BASE-T1 and 1000BASE-T1 to 2.5G / 5G / 10GBASE-T1. With the expansion of communication protocols, the parallel detection process of synchronization signals has become increasingly complex, resulting in the problem that the existing solution of only performing parallel detection on one or two signals has poor effect. Summary of the invention

[0005] In view of the above problems existing in the prior art, a detection system for a vehicle-mounted Ethernet link synchronization signal is provided.

[0006] The specific technical solutions are as follows:

[0007] A detection system for a vehicle Ethernet link synchronization signal, which is suitable for a vehicle Ethernet device to judge a synchronization signal sent by an external device, comprising:

[0008] A signal feature identification module, wherein the signal feature identification module generates a synchronization mode identifier according to the signal feature of the synchronization signal;

[0009] A rate determination module, wherein the rate determination module generates a working rate identifier according to the synchronization signal;

[0010] A synchronization module, wherein the synchronization module is connected to the signal feature determination module and the rate determination module respectively, and the synchronization module generates and outputs synchronization information for handshake between the vehicle-mounted Ethernet device and the external device according to the synchronization mode identifier and the working rate identifier;

[0011] The synchronization mode identifier includes a continuous signal and a pulse signal;

[0012] The rate determination module is also provided with a continuous signal detection module, and the continuous signal detection module is connected to the signal feature determination module;

[0013] When the synchronization mode identifier is a continuous signal, the continuous signal detection module directly outputs a pre-configured continuous signal mode rate as the working rate identifier to the synchronization module.

[0014] On the other hand, the signal feature identification module includes:

[0015] A timing module, wherein the timing module generates a clock signal;

[0016] A counting module, the counting module is connected to the timing module, and the counting module generates a cycle counting result as the signal feature according to the input clock signal and the synchronization signal;

[0017] A determination module is used to generate the synchronization mode identifier according to the signal characteristics.

[0018] On the other hand, the rate determination module includes:

[0019] A sampling module, wherein the sampling module samples the synchronization signal to form sampling data;

[0020] A decision module, wherein the decision module generates a PN sequence according to the sampled data;

[0021] A detection module, the detection module is connected to the decision module, and the detection module generates the working rate identifier according to the PN sequence.

[0022] On the other hand, the rate determination module also includes:

[0023] A gain control module, wherein an input end of the gain control module receives the synchronization signal, and an output end of the gain module is connected to an input end of the sampling module;

[0024] The gain control module generates a gain parameter according to the signal amplitude of the synchronization signal and a preset sampling range corresponding to the sampling module;

[0025] The gain control module uses the gain parameter to adjust the gain value of the synchronization signal and then outputs it to the sampling module.

[0026] On the other hand, the rate determination module also includes:

[0027] A sampling clock generating module, wherein the sampling clock generating module generates a sampling clock signal;

[0028] A clock recovery module, the clock recovery module is connected to the sampling clock generation module, and the clock recovery module adjusts the sampling clock signal according to a pre-configured optimal sampling parameter to generate an adjusted clock signal;

[0029] The sampling module receives the adjustment clock signal and samples the synchronization signal according to the adjustment clock signal to obtain the sampling data.

[0030] On the other hand, the rate determination module also includes:

[0031] An equalizing module, wherein an input end of the equalizing module is connected to the sampling module, and an output end of the equalizing module is connected to the decision module;

[0032] The equalization module obtains the sampled data, eliminates inter-symbol interference of the sampled data, and then outputs the data to the decision module.

[0033] On the other hand, the balancing module comprises:

[0034] A forward equalizer, the forward equalizer is connected to the sampling module, the forward equalizer obtains the sampling data, and the forward equalizer generates intermediate equalized data after eliminating forward symbol interference from the sampling data;

[0035] A decision feedback filter is connected to the forward equalizer, and the decision feedback filter eliminates backward symbol interference from the intermediate equalized data and outputs the sampled data as the sampled data after eliminating inter-symbol interference.

[0036] On the other hand, the continuous signal discrimination module is also connected to the sampling module, the judgment module and the detection module respectively;

[0037] When the synchronization mode is identified as the continuous signal, the continuous signal identification module further controls the sampling module, the decision module and the detection module to stop processing the synchronization signal.

[0038] On the other hand, the detection module includes:

[0039] A reference signal generating module, wherein the reference signal generating module sequentially generates a pre-configured reference sequence signal;

[0040] The reference sequence signals respectively correspond to the synchronization signals at different working rates of the Ethernet device;

[0041] An autocorrelation module, wherein the autocorrelation module is connected to the reference signal generation module and the decision module respectively, and the autocorrelation module performs sliding autocorrelation processing on the reference sequence signal and the PN sequence to obtain an autocorrelation result;

[0042] A detection and determination module, wherein the detection module is connected to the reference signal generation module and the autocorrelation module respectively, and the detection and determination module determines whether the working rate corresponding to the PN sequence can be obtained according to the autocorrelation result;

[0043] When the working rate can be obtained, the detection and identification module generates the working rate identifier according to the working rate;

[0044] When the working rate cannot be obtained, the detection and determination module controls the reference signal generation module so that the reference signal generation module generates a new reference sequence signal.

[0045] The above technical solution has the following advantages or beneficial effects:

[0046] In order to solve the problem that the parallel detection scheme in the prior art is not effective, in this embodiment, a signal feature identification module and a rate identification module are respectively constructed in the detection system, and the synchronization signal is identified based on the working mode and the working rate corresponding to the signal feature, thereby achieving better detection effect for multiple synchronization signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The embodiments of the present invention will be described more fully with reference to the attached drawings, which are provided for illustration and description only and are not intended to limit the scope of the present invention.

[0048] Figure 1 It is an overall schematic diagram of an embodiment of the present invention;

[0049] Figure 2 Schematic diagram of a signal feature identification module in an embodiment of the present invention;

[0050] Figure 3 Schematic diagram of a rate determination module in an embodiment of the present invention;

[0051] Figure 4 Schematic diagram of a gain control module in an embodiment of the present invention;

[0052] Figure 5 A schematic diagram of a clock recovery module in an embodiment of the present invention;

[0053] Figure 6This is a schematic diagram of a balancing module in an embodiment of the present invention;

[0054] Figure 7 This is a schematic diagram of a submodule of a balancing module in an embodiment of the present invention;

[0055] Figure 8 This is a schematic diagram of a continuous signal discrimination module in an embodiment of the present invention;

[0056] Fig. 9 Schematic diagram of the detection mode in the embodiment of the present invention. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments 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.

[0058] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0059] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0060] The present invention comprises:

[0061] A detection system for a vehicle Ethernet link synchronization signal is suitable for a vehicle Ethernet device to judge a synchronization signal sent by an external device, such as Figure 1 As shown, including:

[0062] Signal feature identification module 1, signal feature identification module 1, signal feature identification module 1 generates a synchronization mode identifier according to the signal feature of the synchronization signal;

[0063] The rate determination module 2 generates a working rate identifier according to the synchronization signal;

[0064] The synchronization module 3 is connected to the signal feature determination module 1 and the rate determination module 2 respectively. The synchronization module 3 generates and outputs synchronization information for handshake between the vehicle Ethernet device and the external device according to the synchronization mode identifier and the working rate identifier;

[0065] The synchronous mode identification includes continuous signal and pulse signal;

[0066] The rate determination module 2 is also provided with a continuous signal detection module 20, and the continuous signal detection module 20 is connected to the signal feature determination module 1;

[0067] When the synchronization mode identifier is a continuous signal, the continuous signal detection module 20 directly outputs the pre-configured continuous signal mode rate as a working rate identifier to the synchronization module 3 .

[0068] Specifically, in response to the problem that the parallel synchronization signal detection method in the prior art has poor detection effect on various vehicle-mounted Ethernet synchronization signals, in this embodiment, a signal feature discrimination module 1 is added to the detection system to discriminate the signal features of the synchronization signal, thereby determining the working mode corresponding to some synchronization signals as the synchronization mode identifier. At the same time, the synchronization signal is further detected by the rate discrimination module 2 to determine the working rate identifier corresponding to the synchronization signal. After obtaining the synchronization mode identifier and the working rate identifier at the same time, the synchronization module 3 can obtain the working mode actually corresponding to the synchronization signal by table lookup matching to generate synchronization information for output, thereby achieving a better detection and discrimination process for the synchronization signal, and can realize 100BASE-T1, 1000BASE-T1,

[0069] The signal under various working modes such as 2.5G / 5G / 10GBASE-T1 has better detection effect.

[0070] In one embodiment, Figure 2 As shown, the signal feature identification module 1 includes:

[0071] Timing module 11, timing module 1 generates a clock signal;

[0072] A counting module 12, the counting module 12 is connected to the timing module 12, and the counting module 12 generates a cycle counting result as a signal feature according to the input clock signal and the synchronization signal;

[0073] The determination module 13 generates a synchronization mode identifier according to the signal characteristics.

[0074] Specifically, in view of the problem that the parallel synchronization signal detection method in the prior art has poor detection effect on multiple vehicle Ethernet synchronization signals, the inventor further studied the synchronization signals under various working modes of the vehicle Ethernet and found that only when the vehicle Ethernet device works under the 100BASE-T1 standard, the signal characteristics of its synchronization signal are reflected as a group of continuous signals, while when the vehicle Ethernet device works under other standards, they are all reflected as pulse signals with different periods. Therefore, in this embodiment, by selecting and setting the timing module 11 and the counting module 12 respectively, the high level of the synchronization signal within a certain period is read, and the period counting result is generated as the signal characteristic, thereby achieving a better discrimination effect on the synchronization signal under the 100BASE-T1 standard and being able to generate the corresponding synchronization mode identification.

[0075] In one embodiment, Figure 3 As shown, the rate determination module 2 includes:

[0076] The sampling module 21 samples the synchronization signal to form sampling data;

[0077] A decision module 22, the decision module 22 generates a PN sequence according to the sampled data;

[0078] The detection module 23 is connected to the decision module 22, and the detection module 23 generates a working rate identifier according to the PN sequence.

[0079] Specifically, in order to address the problem that the parallel synchronization signal detection method in the prior art has poor detection effect on multiple vehicle-mounted Ethernet synchronization signals, in this embodiment, by constructing a sampling module 21, a judgment module 22 and a detection module 23 connected in sequence, the sampling of the synchronization signal is realized, thereby obtaining sampling data, and further judging the sampling data to obtain the PN sequence actually sent by the opposite device, and then by detecting the PN sequence, it is determined that the working rate used by the opposite device is used as the working rate identifier, thereby achieving a better detection effect on synchronization signals at different rates.

[0080] In one embodiment, Figure 4 As shown, the rate determination module 2 also includes:

[0081] A gain control module 24, wherein an input end of the gain control module 24 receives a synchronization signal, and an output end of the gain module 24 is connected to an input end of the sampling module 1;

[0082] The gain control module 24 generates a gain parameter according to the signal amplitude of the synchronization signal and a preset sampling range corresponding to the sampling module 21;

[0083] The gain control module 24 uses the gain parameter to adjust the gain value of the synchronization signal and then outputs it to the sampling module.

[0084] Specifically, in order to address the problem that in an actual vehicle environment, factors such as the transmission medium, environment, and model of the other device may cause the gain value of the synchronization signal to deviate from the sampling range of the sampling module 21, in this embodiment, a gain control module 24 is further added in the front stage of the sampling module 21. The gain control module 24 can determine whether it meets the sampling range of the sampling module 21 according to the signal amplitude of the synchronization signal, and add a positive gain parameter when the signal amplitude is lower than the sampling range, and add a negative gain parameter when the signal amplitude is higher than the sampling range to process the synchronization signal, so as to avoid the problem of inaccurate sampling caused by the synchronization signal deviating from the normal sampling range.

[0085] In one embodiment, Figure 5As shown, the rate determination module 2 also includes:

[0086] A sampling clock generating module 25, the sampling clock generating module 25 generates a sampling clock signal;

[0087] A clock recovery module 26, the clock recovery module 26 is connected to the sampling clock generation module 25, and the clock recovery module 26 adjusts the sampling clock signal according to the pre-configured optimal sampling parameters to generate an adjusted clock signal;

[0088] The sampling module 21 receives the adjustment clock signal and samples the synchronization signal according to the adjustment clock signal to obtain sampling data.

[0089] Specifically, in order to achieve a better sampling effect on the synchronization signal, in this embodiment, a sampling clock generation module 25 is further configured in the rate determination module 2 to generate a sampling clock signal, and a clock recovery module 26 is used to adjust the sampling clock signal, so that the clock signal input to the sampling module 21 is maintained near the optimal sampling point of the sampling module 21, thereby achieving a better sampling effect.

[0090] In one embodiment, Figure 6 As shown, the rate determination module 2 also includes:

[0091] An equalizing module 27, wherein an input end of the equalizing module 27 is connected to the sampling module 21, and an output end of the equalizing module 27 is connected to the decision module 22;

[0092] The equalization module 27 obtains the sampled data, eliminates inter-symbol interference on the sampled data, and outputs the result to the decision module 22 .

[0093] Specifically, in view of the problem that inter-symbol interference may exist in the synchronization signal in the actual vehicle environment, in this embodiment, an equalization module 27 is further added between the sampling module 21 and the judgment module 22. The equalization module 27 eliminates the inter-symbol interference of the sampled data and outputs it to the judgment module 22, so that the subsequent modules can achieve better processing effects.

[0094] In one embodiment, Figure 7 As shown, the equalization module 27 includes:

[0095] A forward equalizer 271, the forward equalizer 271 is connected to the sampling module 21, the forward equalizer 271 obtains sampled data, and the forward equalizer eliminates forward symbol interference from the sampled data to generate intermediate equalized data;

[0096] The decision feedback filter 272 is connected to the forward equalizer 271. The decision feedback filter eliminates the backward symbol interference of the intermediate equalized data and outputs it as the sampling data after eliminating the inter-symbol interference.

[0097] Specifically, in view of the problem of inter-symbol interference that may exist in the synchronization signal in the actual vehicle environment, in this embodiment, the forward symbol interference of the sampled data is eliminated by setting a forward equalizer 271, and the backward symbol interference is eliminated by cooperating with the decision feedback filter 272, so as to achieve a better elimination effect of inter-symbol interference.

[0098] In one embodiment, Figure 8 As shown, the continuous signal discrimination module 20 is also connected to the sampling module 21, the judgment module 22 and the detection module 23 respectively;

[0099] When the synchronization mode is identified as a continuous signal, the continuous signal identification module 20 further controls the sampling module 21, the decision module 22 and the detection module 23 to stop processing the synchronization signal.

[0100] Specifically, in order to achieve faster processing efficiency, in this embodiment, a continuous signal discrimination module 28 is further added to the rate discrimination module 2. The continuous signal discrimination module 28 detects the synchronization mode identifier output by the signal feature discrimination module 1, and when the synchronization mode identifier is a continuous signal, that is, indicating that the synchronization signal is a synchronization signal corresponding to 100BASE-T1, it directly outputs 100m rate as the working rate identifier to the synchronization module 3, and controls the sampling module 21, the judgment module 22 and the detection module 23 to stop sampling the synchronization signal to improve processing efficiency.

[0101] In one embodiment, Fig. 9 As shown, the detection module 23 includes:

[0102] A reference signal generating module 231, the reference signal generating module 231 generates a pre-configured reference sequence signal in sequence;

[0103] The reference sequence signals correspond to synchronization signals of Ethernet devices at different working rates respectively;

[0104] An autocorrelation module 232, the autocorrelation module 232 is connected to the reference signal generation module 231 and the decision module 22 respectively, and the autocorrelation module 232 performs sliding autocorrelation processing on the reference sequence signal and the PN sequence to obtain an autocorrelation result;

[0105] A detection and determination module 233, the detection module 233 is connected to the reference signal generation module 231 and the autocorrelation module 232 respectively, and the detection and determination module 233 determines whether the working rate corresponding to the PN sequence can be obtained according to the autocorrelation result;

[0106] When the working rate can be obtained, the detection and identification module 233 generates a working rate identifier according to the working rate;

[0107] When the working rate cannot be obtained, the detection and determination module 233 controls the reference signal generation module so that the reference signal generation module generates a new reference sequence signal.

[0108] Specifically, in order to achieve a better detection effect on the working rates of various types of synchronization signals, in this embodiment, a reference signal generating module 231 is further set in the detection module to generate a reference sequence signal corresponding to the synchronization signal at different rates, and an autocorrelation module 232 is used to perform sliding autocorrelation processing on the PN sequence and the reference sequence signal, and the detection and judgment module 233 is used to judge until a matching reference sequence signal is found, thereby achieving a better detection process for the working rate.

[0109] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A detection system for vehicle Ethernet link synchronization signal, It is characterized in that Applicable to automotive Ethernet devices to judge the synchronization signals sent by external devices, including: A signal feature identification module, wherein the signal feature identification module generates a synchronization mode identifier according to the signal feature of the synchronization signal; A rate determination module, wherein the rate determination module generates a working rate identifier according to the synchronization signal; A synchronization module, wherein the synchronization module is connected to the signal feature determination module and the rate determination module respectively, and the synchronization module generates and outputs synchronization information for handshake between the vehicle-mounted Ethernet device and the external device according to the synchronization mode identifier and the working rate identifier; The synchronization mode identifier includes a continuous signal and a pulse signal; The rate determination module is also provided with a continuous signal detection module, and the continuous signal detection module is connected to the signal feature determination module; When the synchronization mode identifier is the continuous signal, the continuous signal detection module directly outputs a pre-configured continuous signal mode rate as the working rate identifier to the synchronization module; The rate determination module comprises: A sampling module, wherein the sampling module samples the synchronization signal to form sampling data; An equalizing module, wherein an input end of the equalizing module is connected to the sampling module, and an output end of the equalizing module is connected to the decision module; The equalization module obtains the sampled data, eliminates inter-symbol interference of the sampled data, and then outputs the data to the decision module; A decision module, wherein the decision module generates a PN sequence according to the sampled data; A detection module, the detection module is connected to the decision module, and the detection module generates the working rate identifier according to the PN sequence The balancing module comprises: A forward equalizer, the forward equalizer is connected to the sampling module, the forward equalizer obtains the sampling data, and the forward equalizer generates intermediate equalized data after eliminating forward symbol interference from the sampling data; A decision feedback filter is connected to the forward equalizer, and the decision feedback filter eliminates backward symbol interference from the intermediate equalized data and outputs the sampled data as the sampled data after eliminating inter-symbol interference.

2. The detection system according to claim 1, It is characterized in that The signal feature identification module includes: a timing module, the timing module generates a clock signal; A counting module, the counting module is connected to the timing module, and the counting module generates a cycle counting result as the signal feature according to the input clock signal and the synchronization signal; A determination module is used to generate the synchronization mode identifier according to the signal characteristics.

3. The detection system according to claim 1, It is characterized in that The rate determination module also includes: A gain control module, wherein an input end of the gain control module receives the synchronization signal, and an output end of the gain control module is connected to an input end of the sampling module; The gain control module generates a gain parameter according to the signal amplitude of the synchronization signal and a preset sampling range corresponding to the sampling module; The gain control module uses the gain parameter to adjust the gain value of the synchronization signal and then outputs it to the sampling module.

4. The detection system according to claim 1, It is characterized in that The rate determination module further comprises: a sampling clock generation module, the sampling clock generation module generates a sampling clock signal; A clock recovery module, the clock recovery module is connected to the sampling clock generation module, and the clock recovery module adjusts the sampling clock signal according to a pre-configured optimal sampling parameter to generate an adjusted clock signal; The sampling module receives the adjustment clock signal and samples the synchronization signal according to the adjustment clock signal to obtain the sampling data.

5. The detection system according to claim 1, It is characterized in that The continuous signal detection module is also connected to the sampling module, the decision module and the detection module respectively; When the synchronization mode is identified as the continuous signal, the continuous signal detection module further controls the sampling module, the decision module and the detection module to stop processing the synchronization signal.

6. The detection system according to claim 1, It is characterized in that The detection module comprises: A reference signal generating module, wherein the reference signal generating module sequentially generates a pre-configured reference sequence signal; The reference sequence signals respectively correspond to the synchronization signals at different working rates of the Ethernet device; An autocorrelation module, wherein the autocorrelation module is connected to the reference signal generation module and the decision module respectively, and the autocorrelation module performs sliding autocorrelation processing on the reference sequence signal and the PN sequence to obtain an autocorrelation result; A detection and determination module, wherein the detection module is connected to the reference signal generation module and the autocorrelation module respectively, and the detection and determination module determines whether the working rate corresponding to the PN sequence can be obtained according to the autocorrelation result; When the working rate can be obtained, the detection and identification module generates the working rate identifier according to the working rate; When the working rate cannot be obtained, the detection and determination module controls the reference signal generation module so that the reference signal generation module generates a new reference sequence signal.

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