CN114866436B - CANFD communication signal quality evaluation method and system - Google Patents
CANFD communication signal quality evaluation method and system Download PDFInfo
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- CN114866436B CN114866436B CN202110153783.7A CN202110153783A CN114866436B CN 114866436 B CN114866436 B CN 114866436B CN 202110153783 A CN202110153783 A CN 202110153783A CN 114866436 B CN114866436 B CN 114866436B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a method and a system for evaluating the quality of CANFD communication signals, wherein the method comprises the following steps: s1, acquiring a nominal sampling point of any test node in a CANFD network, a ringing stable point of a received message of the any test node under the worst working conditions at different temperatures and a drift amount of drift of the sampling point due to each set influence factor; s2, determining the sampling point position drift range of any test node according to the nominal sampling point and the drift amount; s3, determining the CANFD communication signal quality according to the relative position relation between the ringing stable point and the sampling point drift range at different temperatures. The method quantifies and decomposes the influence degree of influence factors on the signal quality, can intuitively evaluate the quality degree of the communication signal quality in the CANFD network according to the influence degree, and provides a reliable basis for analysis of test results and improvement of the signal quality. In addition, the node with poor communication signal quality can be improved in a targeted manner.
Description
Technical Field
The invention relates to the technical field of CANFD communication, in particular to a CANFD communication signal quality evaluation method and system.
Background
In recent years, CAN communication is upgraded from classical CAN to CANFD, and the improvement of rate enables functions based on CAN communication to be greatly expanded, and simultaneously, higher requirements are also put on evaluation of signal quality of CANFD communication. The existing assessment method of communication signal quality in the CANFD network is a long-time error rate test, i.e. on the actual CANFD network, the bus is monitored for a long time under various working conditions, such as high-temperature or low-temperature working conditions, and whether an error frame occurs is detected. The object of the long-time error rate test is the whole network, the quality degree of the communication signal cannot be quantified, and when the network generates an error frame, the node from which the error frame is specifically sourced cannot be known, so that a designer cannot improve the network design more pertinently.
Disclosure of Invention
The invention aims to solve the technical problems that the quality evaluation method and the system of the CANFD communication signal are provided, so as to solve the defects that the quality degree of the communication signal cannot be quantified and the specific node which has an error frame cannot be determined by adopting long-time error rate test in the prior art, and thus the network design cannot be improved pertinently.
To solve the above technical problem, an aspect of the present invention provides a method for evaluating CANFD communication signal quality, including:
s1, acquiring a nominal sampling point of any test node in a CANFD network, a drift amount of position drift of the sampling point caused by each set influence factor and a ringing stable point of a received message of the any test node under worst working conditions at different temperatures;
s2, determining a sampling point position drift range of the arbitrary test node according to the nominal sampling point and the drift amount;
s3, determining the CANFD communication signal quality according to the relative position relation between the ringing stable points at different temperatures and the position drift range of the sampling points. In a specific embodiment, the method further comprises:
determining a first drift range of a sampling clock tolerance to the sampling point relative to the ringing stable point, a second drift range of an asymmetry of a transceiver to the sampling point relative to the ringing stable point, a third drift range of an isolation device of any test node to the sampling point relative to the ringing stable point, and a fourth drift range of bit slicing of sampling bits to the sampling point relative to the ringing stable point, wherein the asymmetry of the transceiver comprises an asymmetry of a transceiver of a message sending node and an asymmetry of a transceiver of a message receiving node.
In a specific embodiment, the S2 specifically includes:
calculating according to the first drift range, the second drift range, the third drift range and the fourth drift range to obtain a fifth drift range;
acquiring sampling point position deviation caused by asymmetry of a transceiver of a message sending node;
obtaining a final drift range of the sampling point according to the fifth drift range and the deviation;
and determining the sampling point position drift range according to the final drift range and the nominal sampling point.
In a specific embodiment, the step S3 specifically includes:
and acquiring the working temperature range of any test node, and respectively judging whether the ringing stable point at the highest working temperature is in front of the left end point of the sampling point position drift range, whether the ringing stable point at the lowest working temperature is in front of the left end point of the sampling point position drift range and whether the ringing stable point at room temperature is in front of the left end point of the sampling point position drift range, if the ringing stable points at the three temperatures are in front of the left end point of the sampling point position drift range, determining that the CANFD signal quality is qualified, otherwise, determining that the CANFD signal quality is unqualified.
In a specific embodiment, the method further comprises:
and if the CANFD signal quality is not qualified, adjusting the set influencing factors or physical topology of the CANFD communication quality to reduce the drift range of the sampling points, and re-executing the steps S1-S3.
A second aspect of the present invention provides an evaluation system for CANFD communication signal quality, comprising:
the acquisition unit is used for acquiring a nominal sampling point of any test node in the CANFD network, the drift amount of the position drift of the sampling point caused by each set influence factor and a ringing stable point of the received message of the node under the worst working conditions at different temperatures;
the sampling point position drift range determining unit is used for determining the sampling point position drift range of any test node according to the nominal sampling point and the drift amount;
and a communication signal quality determining unit, configured to determine the CANFD communication signal quality according to the ringing stability points at the different temperatures and the sampling point position drift range.
In one embodiment, the system further comprises:
a first drift range determining unit, configured to determine a first drift range of the sampling clock tolerance to the sampling point relative to the ring stable point;
a second drift range determining unit, configured to determine a second drift range of the asymmetry of the transceiver to the sampling point relative to the ring stability point, where the asymmetry of the transceiver includes an asymmetry of a transceiver of the message sending node controller and an asymmetry of a transceiver of the message receiving node controller;
a third drift range determining unit, configured to determine a third drift range of the sampling point relative to the ring stable point by using an isolation device of the node controller;
and the fourth drift range determining unit is used for determining a fourth drift range of the bit slices of the sampling bits relative to the ring stable point of the sampling point.
In one embodiment of the present invention, in one embodiment,
the sampling point position drift range determining unit specifically includes:
a fifth drift range calculation unit, configured to calculate a fifth drift range according to the first drift range, the second drift range, the third drift range, and the fourth drift range;
the deviation determining unit is used for obtaining sampling point position deviation caused by asymmetry of a transceiver of the message sending node;
a final drift range unit, configured to obtain a final drift range of the sampling point according to the fifth drift range and the deviation;
and the sampling point drift range forming unit is used for determining the sampling point position drift range according to the final drift range and the nominal sampling point.
In a specific embodiment, the communication signal quality determining unit is specifically configured to:
and acquiring the working temperature range of any test node, and respectively judging whether the ringing stable point at the highest working temperature is in front of the left end point of the sampling point position drift range, whether the ringing stable point at the lowest working temperature is in front of the left end point of the sampling point position drift range and whether the ringing stable point at room temperature is in front of the left end point of the sampling point position drift range, if the ringing stable points at the three temperatures are in front of the left end point of the sampling point position drift range, determining that the CANFD signal quality is qualified, otherwise, determining that the CANFD signal quality is unqualified.
In one embodiment, the system further comprises:
an adjusting unit, configured to adjust an influence factor or physical topology of the setting of CANFD communication quality so that a drift range of the sampling point is narrowed when the CANFD signal quality is not acceptable.
The embodiment of the invention has the beneficial effects that: the method comprises the steps of quantifying the influence degree of each influence factor on the position of a sampling point, calculating and obtaining the total drift of the sampling point according to the influence degree of all analysis influence factors, and judging whether the drift range of the sampling point coincides with a ringing stability time point or not to determine the merits of CANFD communication signals. The method quantifies and decomposes the influence of analysis influence factors on the signal quality, can intuitively evaluate the quality degree of the communication signal quality in the CANFD network according to the influence, provides reliable basis for analysis of test results and improvement of the signal quality, refines analysis objects to nodes, can acquire the communication signal quality among nodes in the network, and improves nodes with poor communication signal quality according to the influence.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a CANFD communication signal quality assessment method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of a CANFD network of a CANFD communication signal quality assessment method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of ringing settling time and sampling points of a CANFD communication signal quality assessment method according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a CANFD communication signal quality assessment method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a configuration for determining an asymmetry-induced deviation of a transceiver transmitting a message node controller according to an embodiment of the present invention.
Detailed Description
The following description of embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced.
Referring to fig. 1, a CANFD communication signal quality evaluation method according to an embodiment of the present invention includes the following steps:
s1, acquiring a nominal sampling point of any test node in the CANFD network, a drift amount of position drift of the sampling point caused by each set influence factor and a ringing stable point of a received message of the any test node under worst working conditions at different temperatures.
Specifically, as shown in fig. 2-3, the CANFD network includes a network bus CAN-bus and nodes connected to the CAN-bus, and main devices related to CANFD communication of each node include a CAN controller, an isolation device, and a CAN transceiver, where the CAN controller is connected to the isolation device, the isolation device is connected to the CAN transceiver, and in a communication process between two nodes on the CANFD network, a CANFD message is sent from the CAN controller of the node a first, sent to the bus through the isolation device and the CAN transceiver, and then sequentially reaches the CAN transceiver, the isolation device, and the CAN controller of the node N through a transmission of a distance, and finally the node N sends an ACK dominant response bit. Wherein, the isolation device realizes the isolation of electromagnetic interference, and is an optional device.
The CAN bus adopts a pair of unshielded twisted pair wires as a transmission medium, and differential signals are transmitted on two wires, namely CAN_H and CAN_L signals, which are symmetrical. CAN defines two complementary logical values, a dominant bit and a recessive bit, with dominant representing a logical 0 and recessive representing a logical 1. Because the CAN transceiver is inaccurate in control of dominant-to-recessive switching, dominant bit lengthening and recessive bit shortening are caused, and the maximum bit length shortening in a data frame occurs in the first recessive bit after the dominant bit by combining accumulation of sampling clock tolerance before synchronization. While shortening the bit length will have a great negative impact on the accuracy of the sampled bits. To achieve synchronization between nodes in a CAN network, CAN defines a bit stuffing rule, inserting an additional bit of opposite polarity if consecutive 5 bits are of the same polarity, creating a transition edge for synchronization between nodes. In combination with the filling rule of the CAN protocol, the longest continuous linear bits in the data frame are 5, the worst working condition occurs in the first recessive bit B after the 5 continuous dominant bits A, and sampling errors are most likely to occur in the recessive bit. And respectively obtaining the ringing stability time of the received message under the worst working conditions at different temperatures.
According to the CAN protocol, -3.0V to 0.5V may be identified as a recessive bit and 0.9V to 8.0V may be identified as a dominant bit. As shown in fig. 3, starting with the first intersection point of the dominant-to-recessive jump edge and 0.9V, ending with the last intersection point of the dominant-to-recessive jump edge and 0.5V, this is the ringing settling time t, which represents the recessive bit waveform settling time in the figure. The end point of the ringing settling time is the ringing settling point.
Specifically, a nominal sampling point C and a working temperature range of any test node in the CANFD network are obtained, and a ringing stable point of the any test node receiving a message under the worst working condition in isothermal ranges of the highest working temperature, the normal temperature and the lowest working temperature are respectively obtained.
The location of the sampling points is affected by clock tolerances, network topology, nominal sampling point locations, node transceiver type, interface circuitry of the transceiver, harness performance in the node for connecting the circuitry, and temperature.
Specifically, according to the CAN protocol requirement, the clock tolerance is less than or equal to +/-0.3%, when the clock tolerance of a sending node and a receiving node of data is respectively +0.3% and-0.3%, the drift of a sampling point relative to a ringing stable point is maximum, and the drift under the condition is acquired and recorded as a first drift range.
The asymmetrical performance of the transceiver refers to the change of the bit length after the bit signal with the nominal length is sent from the CAN controller to the bus through the transceiver, and the change of the bit length causes the drift of the sampling point relative to the ringing stability point. The drift may be obtained from a transceiver data manual, and should consider both the transmitting node transceiver and the receiving node transceiver, the drift being noted as a second drift range.
Because an isolation device is adopted between the CAN controller and the CAN transceiver of the node, the isolation device CAN influence the drift of the sampling point relative to the ringing stability time, the drift is marked as a third drift range, and the third drift is 10ns according to an empirical value.
Specifically, the CAN protocol divides a bit into a plurality of fragments, each fragment being a bit slice. The sampling point can only be at the beginning or end of the bit slice, so the bit slice length can shift the sampling point by one bit slice time. This drift is noted as the fourth drift range.
S2, determining the sampling point position drift range of the arbitrary test node according to the nominal sampling point and the drift amount.
As shown in fig. 4, in a specific embodiment, step S2 specifically includes:
s21, calculating to obtain a fifth drift range according to the first drift range, the second drift range, the third drift range and the fourth drift range.
In the step, under the working conditions that the nominal sampling point position, the transceiver interface circuit, the temperature and other relevant design parameters and the physical topology are determined, clock tolerance, the transceiver asymmetry performance, the influence degree of an isolation device and bit slicing adopted between a controller and the transceiver on the sampling point, namely the drift of the sampling point position relative to the ringing stability point, are respectively analyzed.
Specifically, the first drift range, the second drift range, the third drift range, and the fourth drift range are added to obtain a fifth drift range.
S22, acquiring deviation caused by asymmetry of a transceiver of the message sending node.
In the actual network test, the test result of the ringing stable point also contains the deviation caused by the asymmetry of the transceiver of the transmitting node, so that the deviation caused by the asymmetry of the transceiver of the message transmitting node needs to be determined in order to avoid repeated calculation of the deviation caused by the asymmetry of the transceiver.
To determine this deviation, two nodes are connected point-to-point as shown in fig. 5, and the bus harness is as short as possible. The 1 st recessive bit length after 5 consecutive dominant bits is measured on the differential bus of the two nodes, respectively. The deviation of the implicit bit length from the nominal bit length may be considered as a deviation caused by asymmetry of the transceiver of the messaging node.
S23, obtaining a final drift range of the sampling point according to the fifth drift range and the deviation.
Specifically, the fifth drift range is compensated by the deviation, so that the final drift range after compensation is smaller than the fifth drift range.
For example, assuming a fifth drift range of [ -4 4], a deviation of 1, the final drift range is [ -3 3].
S24, determining the sampling point position drift range according to the final drift range and the nominal sampling point.
Specifically, the nominal sampling point is taken as a base point, and the sampling point position drift range D is obtained by respectively moving the corresponding unit length leftwards and backwards according to the two end point values of the final drift range.
For example, assuming a nominal sampling point of 2 and a final drift range of [ -3 3], it is moved 3 units to the left and 3 units to the right, corresponding to a resulting sampling point location drift range of [ -1 6].
S3, determining the CANFD communication signal quality according to the relative position relation between the ringing stable points at different temperatures and the position drift range of the sampling points.
The signal quality can be evaluated according to the position relation between the position drift range of the sampling point and the ringing stable point, if the position drift range of the sampling point is coincident with the ringing stable time, the sampling is considered to be possibly wrong before the sampling is possibly falling at the ringing stable point, the signal quality is bad, and the larger the coincident range is, the worse the signal quality is represented. If the drift range of the sampling point is not coincident with the ringing stable time, the sampling point is considered to be not located before the ringing stable point, sampling errors are avoided, signal quality is good, and the farther the drift range of the sampling point is from the ringing stable time, the better the signal quality is represented.
In a specific embodiment, the evaluation method further comprises: and if the CANFD signal quality is unqualified, adjusting influencing factors or physical topology of the CANFD communication quality to reduce the theoretical drift range of the sampling point, and reevaluating.
Specifically, in the test process, if the ringing stability time of the receiving end coincides with the theoretical sampling point drift range, the node may sample to an incorrect bit value, and parameters affecting the sampling point drift range need to be adjusted at this time, for example, a higher-precision clock is adopted, the length of a branch line is adjusted, and the ringing stability time is reduced. After adjusting the influencing factors, testing is continued according to the steps S1-S3, and the quality of the communication signal of the CANFD network is judged.
According to the CANFD communication signal evaluation method, the influence degree of all analysis influence factors on the position of the sampling point is quantized, the total drift of the sampling point is obtained through calculation according to the influence degree of all analysis influence factors, and whether the drift range of the sampling point coincides with the ringing stability time point or not is judged to determine the advantages and disadvantages of the CANFD communication signal. The method quantifies and decomposes the influence of analysis influence factors on the signal quality, can intuitively evaluate the quality degree of the communication signal quality in the CANFD network according to the influence, provides reliable basis for analysis of test results and improvement of the signal quality, refines analysis objects to nodes, can acquire the communication signal quality among nodes in the network, and improves nodes with poor communication signal quality according to the influence.
Based on the first embodiment of the present invention, the second embodiment of the present invention provides a CANFD communication signal quality evaluation system, which includes an acquisition unit, a sampling point position drift range determining unit and a communication signal quality determining unit, where the acquisition unit is configured to acquire a nominal sampling point of any test node in a CANFD network, a drift amount of each set influence factor that causes the sampling point position drift, and a ring stable point of a packet received by the any test node under a worst working condition at different temperatures, the sampling point position drift range determining unit is configured to determine a sampling point position drift range of the any test node according to the nominal sampling point and the drift range, and the communication signal quality determining unit is configured to determine the CANFD communication signal quality according to the ring stable point and the sampling point position drift range at different temperatures.
In a specific embodiment, the system further comprises a first drift range determining unit, a second drift range determining unit, a third drift range determining unit and a fourth drift range determining unit, wherein the first drift range determining unit is used for determining a first drift range of sampling clock tolerance to the sampling point relative to the ring stable point, the second drift range determining unit is used for determining a second drift range of asymmetry of a transceiver to the sampling point relative to the ring stable point, the third drift range determining unit is used for determining a third drift range of an isolation device of the node to the sampling point relative to the ring stable point, and the fourth drift range determining unit is used for determining a fourth drift range of bit fragments of sampling bits to the sampling point relative to the ring stable point.
In a specific embodiment, the sampling point position drift range determining unit specifically includes a fifth drift range calculating unit, a deviation determining unit, a final drift range determining unit, and a sampling point drift range forming unit, where the fifth drift range calculating unit is configured to calculate and obtain a fifth drift range according to the first drift range, the second drift range, the third drift range, and the fourth drift range, the deviation determining unit is configured to obtain a deviation caused by asymmetry of a transceiver of a message sending node, the final drift range determining unit is configured to obtain a final drift range of the sampling point according to the fifth drift range and the deviation, and the sampling point drift range forming unit is configured to determine a sampling time interval of the sampling point according to the final drift range and the nominal sampling time point.
In a specific embodiment, the communication signal quality determining unit is specifically configured to obtain an operating temperature range of the arbitrary test node, respectively determine whether a ringing stable point at a highest operating temperature coincides with the sampling point location drift range, whether a ringing stable point at a lowest operating temperature coincides with the sampling point location drift range, and whether a ringing stable point at room temperature coincides with the sampling point location drift range, and determine that the CANFD signal quality is qualified if none of the three temperatures coincides, otherwise, the CANFD signal quality is not qualified.
In a specific embodiment, the system further comprises an adjusting unit for adjusting factors or physical topology of the CANFD communication quality to reduce the drift range of the sampling points when the CANFD signal quality is not acceptable.
For the working principle of the present embodiment and the beneficial effects thereof, please refer to the description of the first embodiment of the present invention, and the description thereof is omitted herein.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. A method of evaluating CANFD communication signal quality, comprising:
s1, acquiring a nominal sampling point of any test node in a CANFD network, a drift amount of position drift of the sampling point caused by each set influence factor and a ringing stable point of a received message of the any test node under worst working conditions at different temperatures;
s2, determining a sampling point position drift range of the arbitrary test node according to the nominal sampling point and the drift amount;
s3, determining the CANFD communication signal quality according to the relative position relation between the ringing stable points at different temperatures and the position drift range of the sampling points.
2. The method according to claim 1, wherein the method further comprises:
determining a first drift range of a sampling clock tolerance to the sampling point relative to the ringing stable point, a second drift range of an asymmetry of a transceiver to the sampling point relative to the ringing stable point, a third drift range of an isolation device of any test node to the sampling point relative to the ringing stable point, and a fourth drift range of bit slicing of sampling bits to the sampling point relative to the ringing stable point, wherein the asymmetry of the transceiver comprises an asymmetry of a transceiver of a message sending node and an asymmetry of a transceiver of a message receiving node.
3. The method according to claim 2, wherein S2 specifically comprises:
calculating according to the first drift range, the second drift range, the third drift range and the fourth drift range to obtain a fifth drift range;
acquiring sampling point position deviation caused by asymmetry of a transceiver of a message sending node;
obtaining a final drift range of the sampling point according to the fifth drift range and the deviation;
and determining the sampling point position drift range according to the final drift range and the nominal sampling point.
4. A method according to claim 3, wherein S3 comprises:
and acquiring the working temperature range of any test node, and respectively judging whether the ringing stable point at the highest working temperature is in front of the left end point of the sampling point position drift range, whether the ringing stable point at the lowest working temperature is in front of the left end point of the sampling point position drift range and whether the ringing stable point at room temperature is in front of the left end point of the sampling point position drift range, if the ringing stable points at the three temperatures are in front of the left end point of the sampling point position drift range, determining that the CANFD signal quality is qualified, otherwise, determining that the CANFD signal quality is unqualified.
5. The method according to claim 4, wherein the method further comprises:
and if the CANFD signal quality is not qualified, adjusting the set influencing factors or physical topology of the CANFD communication quality to reduce the sampling point position drift range, and re-executing the steps S1-S3.
6. A CANFD communication signal quality assessment system, comprising:
the acquisition unit is used for acquiring a nominal sampling point of any test node in the CANFD network, the drift amount of the position drift of the sampling point caused by each set influence factor and a ringing stable point of the received message of the node under the worst working conditions at different temperatures;
the sampling point position drift range determining unit is used for determining the sampling point position drift range of any test node according to the nominal sampling point and the drift amount;
and the communication signal quality determining unit is used for determining the CANFD communication signal quality according to the relative position relation between the ringing stable points at different temperatures and the position drift range of the sampling points.
7. The system of claim 6, wherein the system further comprises:
a first drift range determining unit, configured to determine a first drift range of the sampling clock tolerance to the sampling point relative to the ring stable point;
a second drift range determining unit, configured to determine a second drift range of the asymmetry of the transceiver to the sampling point relative to the ring stability point, where the asymmetry of the transceiver includes an asymmetry of a transceiver of the message sending node controller and an asymmetry of a transceiver of the message receiving node controller;
a third drift range determining unit, configured to determine a third drift range of the sampling point relative to the ring stable point by using an isolation device of the node controller;
and the fourth drift range determining unit is used for determining a fourth drift range of the bit slices of the sampling bits relative to the ring stable point of the sampling point.
8. The system according to claim 7, wherein the sampling point position drift range determining unit specifically includes:
a fifth drift range calculation unit, configured to calculate a fifth drift range according to the first drift range, the second drift range, the third drift range, and the fourth drift range;
the deviation determining unit is used for obtaining sampling point position deviation caused by asymmetry of a transceiver of the message sending node;
a final drift range unit, configured to obtain a final drift range of the sampling point according to the fifth drift range and the deviation;
and the sampling point drift range forming unit is used for determining the sampling point position drift range according to the final drift range and the nominal sampling point.
9. The system according to claim 8, wherein the communication signal quality determination unit is specifically configured to:
and acquiring the working temperature range of any test node, and respectively judging whether the ringing stable point at the highest working temperature is in front of the left end point of the sampling point position drift range, whether the ringing stable point at the lowest working temperature is in front of the left end point of the sampling point position drift range and whether the ringing stable point at room temperature is in front of the left end point of the sampling point position drift range, if the ringing stable points at the three temperatures are in front of the left end point of the sampling point position drift range, determining that the CANFD signal quality is qualified, otherwise, determining that the CANFD signal quality is unqualified.
10. The system of claim 9, wherein the system further comprises:
an adjusting unit, configured to adjust an influence factor or physical topology of the setting of CANFD communication quality so that the sampling point position drift range is narrowed when the CANFD signal quality is not acceptable.
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