Vehicle-mounted Ethernet converter system and data traffic acquisition method

Abstract

The invention provides a vehicle-mounted Ethernet converter system and a data traffic acquisition method, the vehicle-mounted Ethernet converter system comprises a vehicle-mounted Ethernet, a common Ethernet and a single-chip microcomputer, and the vehicle-mounted Ethernet and the common Ethernet are in communication connection and form a communication line for transmitting data. The single-chip microcomputer is used for collecting a voltage signal of the communication line and determining the signal transmission rate of the communication line based on the voltage signal. Wherein a buffer and a filter are sequentially connected between the communication line and the single-chip microcomputer, the buffer is used for amplifying and isolating a voltage signal, the filter is used for filtering noise in the amplified voltage signal, and the ADC input end of the single-chip microcomputer is connected with the filter. The anti-interference capability and the transmission stability of the voltage signal can be improved, so that the accuracy of the signal transmission rate obtained according to the voltage signal is higher, and the real-time monitoring of the signal transmission rate in the data transmission process of the vehicle-mounted Ethernet is realized.

Description

Technical Field

[0001] The present invention relates to the field of Ethernet, and in particular to a vehicle-mounted Ethernet converter system and a data flow acquisition method. Background Art

[0002] With the development of automobile intelligence and networking, a large amount of data needs to be transmitted inside the car. Due to its high bandwidth and low latency, automotive Ethernet has become an important technology for carrying these data transmissions. The size of data flow and its reasonable control are directly related to the normal operation of various systems in the car.

[0003] In-vehicle Ethernet and ordinary Ethernet need to be converted in many scenarios. For example, when the internal data of the vehicle (such as vehicle diagnostic information and sensor data) needs to be transmitted to an external maintenance station server or cloud platform for analysis, since the external network is usually ordinary Ethernet, conversion is required. In addition, when the vehicle software is updated, the update package downloaded from the external network is transmitted via ordinary Ethernet, and to apply it to the vehicle system, it needs to be adapted to the in-vehicle Ethernet.

[0004] like Figure 1 As shown in the figure, in the conversion process between vehicle Ethernet and ordinary Ethernet, in order to ensure the real-time performance during the transmission process, the vehicle Ethernet PHY and the ordinary RJ45 PHY are usually connected in a back-to-back manner. Taking the MII interface as an example (similarly, the GMII, RGMII and RMII interfaces are functionally consistent with the MII interface, and the difference is mainly reflected in the number of I / Os and the transmission rate), the BASE-T1 Ethernet interface is directly connected to the RJ45 Ethernet interface, and there is no other network device (such as a switch, a router) in the middle for transfer. However, since the communication between the two such PHYs is not exposed to the external interface, it is impossible to directly obtain the real-time data during the transmission process at both ends, and it is impossible to monitor the transmission rate of the vehicle Ethernet converter in real time. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide an in-vehicle Ethernet converter system and a data flow acquisition method, which solves the problem in the prior art that the transmission rate of the in-vehicle Ethernet converter cannot be monitored in real time during the conversion process between the in-vehicle Ethernet and the ordinary Ethernet.

[0006] In a first aspect, the present application provides an in-vehicle Ethernet converter system, comprising an in-vehicle Ethernet, an ordinary Ethernet and a single-chip microcomputer, wherein the in-vehicle Ethernet is communicatively connected to the ordinary Ethernet to form a communication line for transmitting data, and the single-chip microcomputer is used to collect a voltage signal of the communication line and determine the signal transmission rate of the communication line based on the voltage signal; wherein a buffer and a filter are connected in sequence between the communication line and the single-chip microcomputer, the buffer is used to amplify and isolate the voltage signal, the filter filters out noise in the amplified voltage signal, and the ADC input end of the single-chip microcomputer is connected to the filter.

[0007] In one embodiment, the communication line includes a TXC line and a RXC line, the TXC line and the RXC line are respectively connected to corresponding buffers, and the filter is provided between each buffer and the single chip microcomputer.

[0008] In one embodiment, the buffer connected to the TXC line is disposed close to the TXC line; and the buffer connected to the RXC line is disposed close to the RXC line.

[0009] In one embodiment, the filter is an RC filter.

[0010] In one embodiment, the single chip microcomputer is also connected to a host computer and / or a display.

[0011] In one embodiment, a low-pass filter unit is provided in the single chip microcomputer, and the low-pass filter unit is used to filter out noise in the voltage signal collected by the ADC input terminal.

[0012] In one embodiment, the low-pass filtering unit includes an infinite impulse response filtering module, and the expression of the infinite impulse response filtering module is:

[0013] y[n]=a*cdotx[n]+(1-a)*cdoty[n-1]

[0014] Wherein, y[n] is the current output voltage signal, x[n] is the input voltage signal, y[n-1] is the previous output voltage signal, a is the smoothing factor, a=fc / (fc+fs), fc is the sampling frequency, and fs is the cutoff frequency.

[0015] In one embodiment, the low-pass filtering unit includes a sliding average filtering module, and the expression of the sliding average filtering module is:

[0016]

[0017] Among them, y[n] is the current output voltage signal, N is the size of the sampling window, and x(ni) is the voltage signal of the previous i-th input.

[0018] In one embodiment, the low-pass filtering unit includes an RC filtering module, and the expression of the RC filtering module is:

[0019]

[0020] Where y[n] is the current output voltage signal, x[n] is the input voltage signal, y[n-1] is the previous output voltage signal, T is the sampling period, and RC is the time constant.

[0021] In a second aspect, the present application provides a method for acquiring data traffic of an in-vehicle Ethernet converter, which is implemented by the in-vehicle Ethernet converter system described in any one of the first aspects, and is characterized in that the method includes:

[0022] The voltage signal of the communication line is collected, the buffer amplifies and isolates the collected voltage signal, and the filter filters out the noise in the amplified voltage signal;

[0023] Determine a timing diagram within a preset time period according to the voltage signal after noise is filtered out;

[0024] The proportion of the high level in the timing diagram is determined, and the signal transmission rate is determined based on the proportion of the high level.

[0025] In the vehicle-mounted Ethernet converter system and data flow acquisition method of the present application, the voltage signal of the communication line between the vehicle-mounted Ethernet and the ordinary Ethernet is collected in real time through the ADC input end of the single-chip microcomputer, and the voltage signal is amplified, isolated and filtered in combination with the buffer and the filter, which can improve the anti-interference ability and transmission stability of the voltage signal, thereby ensuring that the signal transmission rate obtained according to the voltage signal is more accurate, and realizing real-time monitoring of the signal transmission rate of the vehicle-mounted Ethernet during data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 This is a schematic diagram of connecting the PHY of the in-vehicle Ethernet and the PHY of the ordinary RJ45 in a back-to-back manner in an embodiment of the present application.

[0028] Figure 2 Schematic diagram of the structure of the vehicle Ethernet converter system in the embodiment of the present application.

[0029] Figure 3 This is a timing diagram of the PHY interaction between the in-vehicle Ethernet and the ordinary Ethernet in the embodiment of the present application. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description 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.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0033] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0034] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0035] like Figure 2 As shown, the present application provides an in-vehicle Ethernet converter system, including an in-vehicle Ethernet, an ordinary Ethernet and a single-chip microcomputer, wherein the in-vehicle Ethernet is communicatively connected with the ordinary Ethernet to form a communication line for transmitting data, and the single-chip microcomputer is used to collect the voltage signal of the communication line and determine the signal transmission rate of the communication line based on the voltage signal; wherein a buffer and a filter are connected in sequence between the communication line and the single-chip microcomputer, the buffer is used to amplify the voltage signal and isolate it, the filter filters out the noise in the amplified voltage signal, and the ADC input end of the single-chip microcomputer is connected to the filter.

[0036] In the vehicle-mounted Ethernet converter system of the present application, the voltage signal of the communication line between the vehicle-mounted Ethernet and the ordinary Ethernet is collected in real time through the ADC input end of the single-chip microcomputer, and the voltage signal is amplified, isolated and filtered in combination with the buffer and the filter, which can improve the anti-interference ability and transmission stability of the voltage signal, thereby ensuring that the signal transmission rate obtained according to the voltage signal is more accurate, and realizing real-time monitoring of the signal transmission rate of the vehicle-mounted Ethernet during data transmission.

[0037] In one embodiment, the communication line includes a TXC line and a RXC line, the TXC line and the RXC line are respectively connected to corresponding buffers, and the filter is provided between each buffer and the single chip microcomputer.

[0038] In Ethernet communication, the TXC (Transmit Clock) line is mainly used to provide a clock signal when sending data, while the RXC (Receive Clock) line is used for clock synchronization when receiving data. In the Ethernet interface, the TXC line controls the transmission of data on the data line, ensuring that the data is output from the data line of the sending device at the correct rate and sequence; while the RXC line ensures that the receiving device can correctly capture and process the received data on the data line.

[0039] This embodiment collects voltage signals of the TXC line and the RXC line respectively, and provides a buffer to amplify and isolate the voltage during the collection process, and filters the noise in the voltage signal by setting a filter, thereby ensuring that the voltage signals from the TXC line and the RXC line have high stability.

[0040] In one embodiment, the buffer connected to the TXC line is disposed close to the TXC line; and the buffer connected to the RXC line is disposed close to the RXC line.

[0041] In the design of the in-vehicle Ethernet converter, in order to achieve effective signal buffering and processing, two additional lines need to be added to connect the buffer to the Ethernet PHY. It should be noted that these additional lines may produce an "antenna effect", that is, the parasitic inductance and capacitance generated during signal transmission will affect the rise and fall time of the signal, thereby affecting the signal quality.

[0042] In order to minimize the negative impact of the antenna effect, place the buffer as close to the PHY interface as possible. This is because shorter wires can reduce reflection, loss, and delay of signals during transmission, thereby maximizing the quality of the original signal. By optimizing the wiring layout and buffer position, signal interference can be effectively reduced to ensure the stability and accuracy of data transmission.

[0043] In one embodiment, the filter is an RC filter. In this embodiment, the RC filter is a filter circuit composed of a resistor R and a capacitor C, which realizes signal filtering by utilizing the impedance characteristics of the capacitor and the resistor for signals of different frequencies. At the output end of the buffer, an RC filter is used to smooth the signal. The RC filter can effectively filter out high-frequency noise, making the signal more stable and facilitating the subsequent conversion of the ADC input end of the single-chip microcomputer.

[0044] In one embodiment, the single chip microcomputer is further connected to a host computer and / or a display. In this embodiment, the output end of the single chip microcomputer is communicatively connected to the host computer and the display, and the signal transmission rate converted by the single chip microcomputer through the voltage signal can be displayed in real time.

[0045] In one embodiment, a low-pass filter unit is provided in the single-chip microcomputer, and the low-pass filter unit is used to filter out the noise in the voltage signal collected by the ADC input terminal. In this embodiment, since the voltage data obtained by the ADC input terminal still has certain fluctuations due to noise, a low-pass filter is performed in the single-chip microcomputer to filter out high-frequency noise signals and retain only low-frequency signals, so that a more accurate signal transmission speed can be obtained, which can be directly displayed on the display or sent to the upper computer software for display.

[0046] In one embodiment, the low-pass filtering unit includes an infinite impulse response filtering module, and the expression of the infinite impulse response filtering module is:

[0047] y[n]=a*cdotx[n]+(1-a)*cdoty[n-1]

[0048] Where y[n] is the current output voltage signal, x[n] is the input voltage signal, y[n-1] is the previous output voltage signal, a is the smoothing factor, a=fc / (fc+fs), fc is the sampling frequency, and fs is the cutoff frequency. a is usually a constant less than 1, which is used to control the cutoff frequency of the filter.

[0049] In this embodiment, the infinite impulse response filter module is implemented based on a recursive algorithm. According to the input voltage signal and the last output voltage signal, the current voltage signal is calculated, and the infinite impulse response filter module filters the received signal to remove channel noise and interference, and designs a suitable passband and stopband according to the frequency characteristics of the signal to improve the quality of the signal, thereby improving the stability of real-time monitoring of the signal transmission rate.

[0050] In one embodiment, the low-pass filtering unit includes a sliding average filtering module, and the expression of the sliding average filtering module is:

[0051]

[0052] Among them, y[n] is the current output voltage signal, N is the size of the sampling window, and x(ni) is the voltage signal of the previous i-th input.

[0053] In this embodiment, the sliding average filter module is implemented based on the weighted average method. The average value of several consecutive data points in the signal sequence is calculated. In the process of calculating the average value, different weights are assigned to different data points, and the average value is used as the output after filtering. The weighted average method can more flexibly adjust the filtering effect according to factors such as the timeliness of the data. By reasonably allocating weights, the output after filtering can respond to the changing trend of the signal more quickly while maintaining a certain noise suppression ability.

[0054] In one embodiment, the low-pass filtering unit includes an RC filtering module, and the expression of the RC filtering module is:

[0055]

[0056] Where y[n] is the current output voltage signal, x[n] is the input voltage signal, y[n-1] is the previous output voltage signal, T is the sampling period, and RC is the time constant.

[0057] In this embodiment, the RC filter module is implemented by discretizing a continuous RC filter formula in a single chip microcomputer by simulating an RC circuit composed of a capacitor and a resistor.

[0058] In addition, if the microcontroller resources allow, the CPU burden can also be reduced by hardware-assisted filtering, for example: using analog hardware filters (such as RC low-pass filters configured with operational amplifiers); or using dedicated digital signal processor (DSP) hardware or external filter chips for low-pass filtering. When a large number of high-frequency signals need to be processed, it can reduce the processing burden of the microcontroller.

[0059] In summary, in the vehicle Ethernet converter system of this embodiment, by introducing a buffer in the communication circuit between the vehicle Ethernet and the ordinary Ethernet, the signal's anti-interference ability and transmission reliability are improved; the application of the RC filter makes the signal smoother and reduces the measurement error; and the ADC of the single-chip microcomputer realizes real-time data monitoring, which simplifies the hardware design and reduces the cost. This embodiment provides a simple and effective method for determining the data transmission rate based on the voltage value, which has good practicality and scalability.

[0060] This embodiment also provides a method for obtaining data flow of an in-vehicle Ethernet converter, which is implemented by the in-vehicle Ethernet converter system. The method includes:

[0061] Step S100: collecting a voltage signal of the communication line, amplifying and isolating the collected voltage signal by a buffer, and filtering out noise in the amplified voltage signal by a filter;

[0062] Step S200: determining a timing diagram within a preset time period according to the voltage signal after noise is filtered out;

[0063] Step S300: determining the proportion of high levels in the timing diagram, and determining a signal transmission rate based on the proportion of high levels.

[0064] In the vehicle Ethernet converter data flow acquisition method of the present embodiment, the voltage signal of the communication line between the vehicle Ethernet and the ordinary Ethernet is collected in real time through the ADC input end of the single-chip microcomputer, and the voltage signal is amplified, isolated and filtered in combination with the buffer and the filter, which can improve the anti-interference ability and transmission stability of the voltage signal, thereby ensuring that the signal transmission rate obtained according to the voltage signal is more accurate, and realizing real-time monitoring of the signal transmission rate of the vehicle Ethernet during the data transmission process.

[0065] In step S100, the voltage signals of the TXC line and the RXC line are collected respectively, and buffers are provided during the collection process to amplify and isolate the voltage, and filters are provided to filter out noise in the voltage signal, thereby ensuring that the voltage signals from the TXC line and the RXC line have high stability.

[0066] In step S200, the collected voltage signal is recorded at fixed time intervals (such as collecting a voltage value every microsecond). The time axis and the voltage axis are determined according to the time of the voltage signal, and the range of the time axis is determined according to the preset time period. Assuming that the preset time period is from to, the time axis starts from, with the time interval of the collected data as the step length, until the end. The voltage axis is determined according to the actual range of the voltage signal. For example, if the voltage signal range is from to, the voltage axis is from to, and the scale is divided according to the accuracy of the data. Then, in chronological order, the voltage value corresponding to each time point is marked on the coordinate axis, and then these points are connected in sequence with line segments to obtain a timing diagram within the preset time period.

[0067] In step S300, in the timing diagram, first find a complete cycle of the RXC signal. For example, the cycle is determined by measuring the time interval between two adjacent rising edges (or falling edges), and the reciprocal of this cycle is the frequency of the RXC signal. Then determine the corresponding relationship between the level change of the RXD signal and the edge of the RXC signal; if one data bit is transmitted in each RXC clock cycle, then the data bit cycle is equal to a complete cycle of the RXC signal. Then traverse each data point in the cycle in the timing diagram, count the number of time points at which the voltage value is higher than the high level threshold, and the total number of time points (the total number of time points can be calculated by the length of the preset time period and the time interval of data collection), calculate the ratio of the number of time points higher than the high level threshold to the total number of time points to determine the high level proportion, thereby determining the signal transmission rate according to the transmission time and bandwidth of the high level voltage signal.

[0068] like Figure 3 As shown in the timing diagram of the interaction between the two Ethernet PHYs, RXC will be pulled high when receiving data, and RXC will be pulled low when data reception is completed; TXC will be pulled high when sending data, and pulled low when sending is completed. Determine the proportion of high levels within a period of time, and thus calculate the communication data flow during this period.

[0069] In the embodiments of the mobile terminal and computer-readable storage medium provided in the present application, all technical features of the above-mentioned control method embodiments are included, and the expansion and explanation content of the specification are basically the same as those of the above-mentioned method embodiments, which will not be repeated here.

[0070] The embodiment of the present application further provides a computer program product, which includes a computer program code. When the computer program code runs on a computer, the computer executes the methods in the above various possible implementation modes.

[0071] An embodiment of the present application also provides a chip, including a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a device equipped with the chip executes the methods in various possible implementation modes as described above.

[0072] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0073] In the present application, the same or similar terminology concepts, technical solutions and / or application scenario descriptions are generally described in detail only the first time they appear. When they appear again later, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of the present application, for the same or similar terminology concepts, technical solutions and / or application scenario descriptions that are not described in detail later, reference can be made to the previous related detailed descriptions.

[0074] In the present application, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0075] The various technical features of the technical solution of the present application can be arbitrarily combined. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.

[0076] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a storage medium as above, including a number of instructions for a terminal device to execute the method of each embodiment of the present application. The above is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly used in other related technical fields, is similarly included in the patent protection scope of the present application.

[0077] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0078] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A vehicle-mounted Ethernet converter system, characterized in that: It includes an in-vehicle Ethernet, a common Ethernet and a single-chip microcomputer. The in-vehicle Ethernet is communicatively connected with the common Ethernet to form a communication line for transmitting data. The single-chip microcomputer is used to collect the voltage signal of the communication line and determine the signal transmission rate of the communication line based on the voltage signal. A buffer and a filter are connected in sequence between the communication line and the single-chip microcomputer. The buffer is used to amplify and isolate the voltage signal. The filter filters out noise in the amplified voltage signal. The ADC input end of the single-chip microcomputer is connected to the filter.

2. The vehicle-mounted Ethernet converter system according to claim 1, characterized in that: The communication line includes a TXC line and a RXC line, the TXC line and the RXC line are respectively connected with corresponding buffers, and the filter is arranged between each buffer and the single chip microcomputer.

3. The vehicle-mounted Ethernet converter system according to claim 2, characterized in that: The buffer connected to the TXC line is arranged close to the TXC line; the buffer connected to the RXC line is arranged close to the RXC line.

4. The vehicle-mounted Ethernet converter system according to claim 1, characterized in that: The filter is an RC filter.

5. The vehicle-mounted Ethernet converter system according to claim 1, characterized in that: The single chip microcomputer is also connected to a host computer and / or a display.

6. The vehicle-mounted Ethernet converter system according to any one of claims 1 to 5, characterized in that: A low-pass filter unit is provided in the single chip microcomputer, and the low-pass filter unit is used to filter out noise in the voltage signal collected by the ADC input end.

7. The vehicle-mounted Ethernet converter system according to claim 6, characterized in that: The low-pass filtering unit includes an infinite impulse response filtering module, and the expression of the infinite impulse response filtering module is: y[n]=a*cdotx[n]+(1-a)*cdoty[n-1] Wherein, y[n] is the current output voltage signal, x[n] is the input voltage signal, y[n-1] is the previous output voltage signal, a is the smoothing factor, a=fc / (fc+fs), fc is the sampling frequency, and fs is the cutoff frequency.

8. The vehicle-mounted Ethernet converter system according to claim 6, characterized in that: The low-pass filtering unit includes a sliding average filtering module, and the expression of the sliding average filtering module is: Among them, y[n] is the current output voltage signal, N is the size of the sampling window, and x(ni) is the voltage signal of the previous i-th input.

9. The vehicle-mounted Ethernet converter system according to claim 6, characterized in that: The low-pass filtering unit includes an RC filtering module, and the expression of the RC filtering module is: Where y[n] is the current output voltage signal, x[n] is the input voltage signal, y[n-1] is the previous output voltage signal, T is the sampling period, and RC is the time constant.

10. A method for acquiring data flow of an in-vehicle Ethernet converter, implemented by the in-vehicle Ethernet converter system according to any one of claims 1 to 9, characterized in that: The method comprises: The voltage signal of the communication line is collected, the buffer amplifies and isolates the collected voltage signal, and the filter filters out the noise in the amplified voltage signal; Determine a timing diagram within a preset time period according to the voltage signal after noise is filtered out; The proportion of the high level in the timing diagram is determined, and the signal transmission rate is determined based on the proportion of the high level.

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