3685results about "Bus networks" patented technology

The invention provides an Internet of Vehicles vulnerability management method, system, device and medium based on a block chain, and relates to the technical field of vehicle networks, the method can comprehensively identify potential safety risks of vehicles through a dynamic and static combined vulnerability detection mechanism, and generates a structured vulnerability report; hash abstract chaining evidence storage is performed on key data of reports and subsequent repair links by using a block chain, so that the whole process of vulnerability discovery, analysis and repair is ensured not to be tampered and traceable, and the authenticity and credibility of data are improved; the integrity of the report is verified at the cloud end, and an AI analysis engine is combined to associate a CVE database and threat intelligence, so that intelligent generation and decision support of a repair scheme are realized; the hash abstract on the chain of the OTA patch is verified at the vehicle end, so that the credibility of the patch source and the integrity of the content are guaranteed; and finally, through feedback of an installation result and secondary uplink archiving, complete closed-loop management from vulnerability discovery to repair verification is formed.

The invention relates to the technical field of industrial operation, and discloses a multi-interface industrial control device based on an OpenHarmony industrial operating system and a control method thereof, and the method comprises the steps: scanning an interface resource list of an industrial control computer after the OpenHarmony industrial operating system is started; industrial equipment connected to each interface is automatically found according to the interface resource list, and an equipment connection table is obtained; performing protocol conversion based on the device connection table to obtain a device communication data stream, and extracting a feature data set from the device communication data stream; and calculating an interface coordination scheme based on the feature data set, issuing a control instruction to each industrial device, and collecting execution feedback to obtain unified management and control data. Unified control and remote cooperation of the industrial control equipment are realized through the OpenHarmony distributed soft bus, the conflict problem during multi-protocol concurrent access is effectively solved, and local intelligent decision and cloud resource scheduling of the industrial operation system are realized.

The invention discloses an Internet of Vehicles intrusion detection method based on hierarchical feature enhancement and a dynamic sparse attention mechanism, and the method comprises the steps: firstly obtaining an original CAN bus message data stream, and carrying out the multi-modal data preprocessing and hierarchical feature construction; secondly, for hierarchical features, performing message-level depth feature compression and space-time statistical feature enhancement by adopting a dual-channel feature compression mechanism to form an enhanced mixed feature vector, and then constructing a neural network model of a dynamic sparse attention mechanism based on content awareness to perform feature extraction; and inputting a sparse attention calculation result into a hierarchical classifier, and predicting and outputting a detection result. And training the network model, and deploying the trained network model in a vehicle-mounted embedded device to realize real-time message monitoring and intrusion detection. According to the method, the calculation complexity and parameter quantity of the model are greatly reduced, the real-time performance in a vehicle-mounted environment is remarkably improved, and the detection capability on complex hidden attacks is effectively improved.

The invention discloses an engineering vehicle safety simulation and prediction system based on digital twinning, and the system comprises a data collection layer which collects multi-source heterogeneous data in real time; in the knowledge graph layer, a streaming inference engine is constructed based on an Apache Jena graph database, and an entity-relationship-attribute triple dynamic graph structure is adopted; according to the AI model layer, a physical rule serves as a loss function constraint term to be embedded into a neural network through a physical information neural network, a digital organ model concept is combined to split a vehicle into key organs for heterogeneous modeling, a simplified physical model is adopted in the core physical process, and an LSTM-AI model is adopted in external behaviors; the explanatory analysis layer is used for integrating an SHAP / LIME explanatory tool to output a visual evidence chain during fault prediction, and deploying an online incremental learning framework to allow the model to learn from new data and dynamically adjust normal range definition; and the visualization and application layer is used for performing three-dimensional visualization rendering based on WebGL or Three.js, and ensuring data transmission security through block chain evidence storage and end-to-end encryption.

The invention discloses an Internet of Vehicles CAN bus intrusion detection method based on noise perception active learning, and belongs to the technical field of Internet of Vehicles safety and machine learning. The invention aims to solve the technical problems of false label noise interference, high manual labeling cost, high attack missing report rate caused by class imbalance and the like. The core of the method is to execute a noise sensing mixed query strategy in an iterative loop: firstly, generating a pseudo tag through clustering and correcting by using an integrated noise detector; secondly, calculating uncertainty scores and noise probabilities of the samples, fusing the uncertainty scores and the noise probabilities to obtain a comprehensive score, and preferentially selecting the samples with high uncertainty and low noise probabilities; and then adaptively selecting a sampling strategy according to the model performance and applying category balance constraint. The query batch is used to iteratively update the model while dynamically adjusting the classification threshold to reduce the missing report rate. According to the method, the influence of pseudo label noise can be effectively suppressed, and the attack detection precision and generalization capability are remarkably improved with extremely low labeling cost.

The invention discloses a CAN message priority dynamic arbitration method and system based on event triggering, and the method comprises the steps: obtaining a discrete sampling signal of a CAN node of an engineering vehicle and a state register value of a CAN controller, converting the discrete sampling signal into a working condition data sequence, and obtaining a bus load rate through the state register value; obtaining an event state sequence according to the working condition data sequence; all CAN messages to be sent are constructed into a message data record, and the message data record with event semantics and dynamic priority labels is obtained according to the protocol data unit and the event state sequence; and according to the bus load rate and the event state sequence, sending a message data record with event semantics and dynamic priority annotations by adopting a token bucket mechanism through a three-level priority queue linked with a three-state state machine. According to the invention, the security key message in the system can still be transmitted in time under high load, and the bandwidth occupation and delay jitter caused by the low-priority message are avoided at the same time.

The invention discloses a multi-node bus communication protocol automatic test and fault detection method and system, and relates to the technical field of communication protocol test and diagnosis. The automatic test and fault detection method and system for the multi-node bus communication protocol comprises the following steps: S1, acquiring communication node state data and preprocessing the communication node state data; s2, measuring communication disturbance intensity caused by node abnormity and recovery lag; s3, evaluating the stability of the communication structure based on the connection state change and the topology reconstruction deviation; and S4, judging the conduction intensity and the sweep range of the abnormal chain. The problems that a communication structure is unstable and difficult to diagnose due to reset storm in an error injection scene, existing process parameters are fixed, state feedback adjustment is lacked, and a bus recovery process is uncontrollable are solved.

The invention relates to the field of vehicle-mounted bus testing, and discloses a vehicle-mounted CAN bus terminal resistor configuration method and system for node testing, and the method comprises the steps: obtaining a node identifier and a terminal resistor identifier corresponding to each test node in a vehicle-mounted CAN bus test, the terminal resistor identifier being used for identifying the terminal resistor access state of the test node; obtaining a first node position of a first test node corresponding to the first node identifier, configuring a terminal resistor for the first test node when the first node position is an end node of the vehicle-mounted CAN bus, and canceling the configured terminal resistor for the test node of a non-end node; and updating the terminal resistor identifier of each test node according to the terminal resistor access state corresponding to each test node. According to the invention, the terminal resistor can be automatically configured in the CAN bus test.

This invention provides a method, apparatus, electronic device, and readable storage medium for redundancy control in ring network communication, relating to the field of vehicle-mounted communication. The method includes: controlling nodes in the vehicle-mounted ring network system to detect abnormal Ethernet link states and broadcast these states via CAN communication; a master control node can determine whether to switch redundant links based on the relevant link abnormal states of each node; if switching is required, a switching control message is broadcast via CAN communication; and each node can adjust its port settings based on the switching control message. By implementing Ethernet link detection and redundant link switching control based on Ethernet communication itself, and by integrating the functions of determining whether to switch links based on abnormal link states and broadcasting switching control messages into the master control node, the requirements for nodes other than the master control node are reduced. This lowers the hardware resource requirements of the vehicle-mounted ring network communication redundancy control scheme compared to existing solutions, making it simpler, easier to implement, and more usable.

The invention provides a system and a method for generating CAN (Controller Area Network) mailbox configuration and data routing configuration based on a communication matrix table. The method comprises the following steps of: reading a predefined finished automobile CAN communication network signal routing information table; analyzing the whole vehicle CAN communication network signal routing information table to obtain CAN communication configuration parameters of each CAN channel; the number of receiving mailboxes and the number of sending mailboxes of each CAN channel are distributed according to the maximum number of receiving mailboxes and the maximum number of sending mailboxes supported by the whole vehicle CAN communication network hardware for each CAN channel and CAN communication configuration parameters of each CAN channel; and when the number of the messages to be processed of a certain CAN channel exceeds the allocated mailbox number, classifying the messages, and multiplexing the same mailbox by the messages belonging to the same class. According to the method, CAN mailbox resources are used to the greatest extent, and the reliability of data routing is ensured; when the whole vehicle communication network signal routing table is frequently changed, the reliability of the routing function is ensured, and meanwhile, the development efficiency is improved.

The present invention relates to a CAN bus anomaly detection method and system based on a dual attention mechanism, comprising the following steps: S1, collecting on-board data from an OBD interface of a vehicle in real time, wherein the collected on-board data comprises operation parameters of an engine, a vehicle speed, the state of a braking system, and the readings of other important sensors; and S2, performing inference analysis on the on-board data at a vehicle end by using an anomaly detection model, calculating a threshold by means of normal operation data so as to identify a potential anomaly or attack mode, once an anomaly is detected, immediately generating identification information, giving a direct alarm to a driver, and slicing, encrypting and storing abnormal data. The present invention relates to the technical field of CAN bus anomaly detection. In the present invention, an anomaly is detected by using the strong relevance of normal data characterization under different perspectives and the difference between the normal data characterization and abnormal data characterization, and by means of the characterization learning of a large amount of normal data, the objective of anomaly detection is achieved, the dependence on abnormal data is reduced, and the accuracy of CAN bus anomaly detection is improved.

The invention is suitable for the field of communication technology improvement, and provides an encryption communication method and system used between EtherCAT slave station nodes, an OTP / nonvolatile storage, an encryption scrambling unit and a decryption descrambling unit are integrated in an EtherCAT slave station chip of a coupler and an I / O module, and encryption / decryption of an EtherCAT message is achieved on the hardware level; xOR operation or an AES algorithm is adopted for encryption, and a secret key is stored in an unmodifiable storage unit; and meanwhile, a parallel architecture of an encrypted network and a standard network is constructed, so that the standard interaction between the slave station node and the master station is not influenced by encrypted communication. The system solves the contradiction of poor real-time performance of a private protocol and easy plaintext communication plagiarism in the prior art, realizes the effects of no real-time performance loss, strong communication exclusiveness and flexible compatibility, and is suitable for an EtherCAT high-speed backplane bus system under industrial 4.0.

The invention discloses a spaceborne high-performance calculation module and system based on a SpaceVPX standard and a control method. The calculation module comprises a board card following the SpaceVPX standard, and a core processor module, a storage module, a communication interface module, a monitoring module, a power management module and a VPX connector which are integrated on the board card. The core processor module adopts an anti-radiation reinforced high-performance processor; the storage module comprises a DDR4, a NORFLASH and an SSD (Solid State Disk); the communication interface module comprises an Ethernet, an SRIO high-speed interface and a debugging interface; the monitoring module collects state information through an I2C bus; the power management module provides stable power supply; the VPX connector leads out an SRIO bus, an ETH bus and an I2C bus, and star interconnection with other units on a satellite is achieved. Through standardized and modular design, the problems that an existing satellite-borne computing architecture is fixed, poor in expansibility and insufficient in reliability are solved, and high-performance, high-reliability and flexibly-combined satellite-borne data processing capacity is achieved.

The invention relates to the technical field of digital-analog hybrid integrated circuit design, and particularly provides a FlexRay bus receiver with low noise and wide common-mode input range, which is characterized in that a common-mode voltage division module receives a differential signal output by a bus and carries out voltage division, and then a pre-amplification module carries out amplitude limiting amplification on the signal after voltage division; the hysteresis comparator module generates threshold hysteresis and generates a logic level signal based on the signal after amplitude limiting amplification, and the digital logic receiving module receives and processes the logic level signal, generates a receiving data signal and transmits the receiving data signal to an external controller. According to the invention, the differential signal pair received on the FlexRay bus is subjected to voltage division and amplitude limiting amplification, so that a wider common-mode input range is provided, the problem of large ground potential difference is solved, and the capability of suppressing common-mode noise and the communication stability are improved. Meanwhile, the hysteresis comparator module suppresses noise false triggering by generating threshold hysteresis, and the anti-noise capability of the receiver is remarkably improved.

The in-vehicle device for receiving time synchronization information transmitted from each of a plurality of reference devices and transmitting the received time synchronization information to another device, includes: a communication unit configured to communicate with the other device; and an information processing unit configured to, if the communication unit receives a frame in which the time synchronization information is stored, store the time synchronization information in a specific queue with priority over other information, wherein the communication unit transmits the time synchronization information stored in the specific queue to the other device.

The invention relates to the field of petroleum well repair engineering, and particularly discloses a secondary well control automation system for conventional minor repair operation of an oil and gas field, which comprises the following steps of: firstly, performing time domain synchronization and Kalman filtering smoothing on multi-source sensor data, and constructing a high-precision synchronization data set; on the basis, the theoretical reference pressure value containing the excitation or swabbing effect is calculated in real time by utilizing the extracted tubular column instantaneous speed and operation modal characteristics and combining a fluid dynamic model. The core lies in that differential calculation is carried out on the theoretical value and actually measured pressure data, and pressure residual decoupling is achieved. The process can dynamically counteract normal physical fluctuation caused by tubular column tripping operation, and the reserved residual sequence is the pure stratum anomaly feature after interference stripping. And finally, a hierarchical control instruction is generated based on the residual sequence, so that the operation efficiency is guaranteed, and meanwhile, the real-time and accurate capture and automatic hierarchical disposal of the secondary well control risk are realized.

The invention relates to the technical field of industrial control, and discloses an industrial communication protocol adaptation method and system based on OpenHarmony. The method comprises the following steps: performing distributed soft bus deployment on a plurality of industrial devices in an industrial control network to obtain a distributed device connection architecture; carrying out multi-protocol adapter loading on the industrial automation runtime service of the distributed equipment connection architecture to obtain a multi-protocol runtime service instance; performing communication protocol identification and configuration on the plurality of industrial devices according to the multi-protocol runtime service instance to obtain standardized device data; and establishing a data transmission channel according to the standardized device data, and performing global state synchronization and cooperative control instruction distribution on the plurality of industrial devices to generate a distributed cooperative control network. The deployment and maintenance work of the industrial control system is simplified, the accuracy and consistency of system configuration are improved, the risk of manual configuration errors is reduced, and the development cost and maintenance complexity of industrial application are reduced.

The invention provides a master-slave communication method, electronic equipment and a storage medium, and relates to the technical field of communication. The method comprises the steps that when a host receives a command frame sent by an upper computer for a target slave and determines that a command symbol in the command frame meets a first preset condition, a first flag bit is sent to the target slave, the first flag bit is used for indicating that the host is about to send the command frame, the target slave interrupts a current process, and the host sends the command frame to the target slave, the target slave executes the command frame, so that the conflict between the command frame and the current process is avoided, the target slave can immediately execute the command frame without queuing and waiting, the command frame is responded in time, and the response delay is reduced.

The described techniques address issues related to compatibility and cost-effectiveness of in-vehicle networks. The described techniques may utilize security Ethernet-based protocols, for example, without the need to exchange separate key agreement messages and, consequently, meet the stringent starting time requirements for real-time control systems. Additionally, a membership tracking solution may be implemented in which each node within a membership group may request, or “challenge” other nodes with the same group to verify their online status, and this online status may be maintained over time. Finally, a transmission queue management process is described that deletes queued messages only when it is determined that every intended recipient node received the message, thereby providing atomicity. Retained queued messages may then be re-transmitted in accordance with a transmission schedule.

The invention relates to the technical field of data analysis, and provides a CAN bus waveform message analysis method, device and equipment and a medium, and the method comprises the steps: issuing an operation instruction carrying a preset operation parameter to an oscilloscope; in response to waveform data fed back by the oscilloscope, storing the waveform data as a message file in a preset format; analyzing and converting the message file according to the data head structural body identified by the oscilloscope to obtain a message array; performing time domain segmentation, normalization processing and de-noising processing on the data in the message array by using a Numpy library to obtain a message signal; and performing error frame screening on the message signal by adopting a strategy of supplementing one after five, and performing layer-by-layer analysis on the screened message signal based on a CAN protocol structure to obtain message analysis content. According to the invention, through the software design of the whole process, a universal scheme is adopted from data acquisition, storage and analysis to signal processing and message generation, so that the analysis universality of the CAN bus waveform message is effectively improved.

The invention discloses a dynamic election method and system for an MODBUS redundant master station. The method comprises the steps that an initial master station broadcasts a specific heartbeat message to a bus regularly; all the candidate nodes continuously monitor the bus and judge whether the initial master station fails or not; if the initial master station breaks down, a master station election mechanism is triggered; calculating waiting delay time of each candidate node, and starting an ontology delay timer; when the delay timer of the candidate node expires, immediately carrying out carrier sensing, and judging whether a bus is idle or not; if the monitoring bus is idle, a master station declaration message is broadcasted immediately, and the self state is switched to a master station; and if the monitoring bus is busy, giving up the master station declaration and returning to the slave station state. Priority ranking logic is carried out preferentially through the minimum address, and it is ensured that a unique and optimal result can be rapidly output in each election process; and through carrier sensing, conflicts caused by the fact that a plurality of candidate nodes compete for the bus at the same time are effectively avoided, and the stability and reliability of the system are ensured.

The utility model relates to a detection system. The detection system comprises a plurality of control hosts; each slave unit comprises at least one slave, the at least one slave comprises a to-be-detected device and / or a detection device for detecting the to-be-detected device, the central repeater is in communication connection with each control host through an SPI communication link, and the central repeater is provided with a plurality of storage modules in one-to-one correspondence with the plurality of control hosts; and the plurality of edge repeaters are respectively in communication connection with the central repeater through SPI communication links, and each edge repeater is respectively connected with all slave machines in one slave machine set through communication interfaces. According to the utility model, signal attenuation and interference in long-distance transmission can be effectively relieved, and the reliable transmission distance of the SPI is expanded; the plurality of control hosts can realize independent and reliable communication with the to-be-detected devices in the different slave units or the detection equipment thereof, and the detection reliability of the to-be-detected devices can be improved.

The invention discloses a battery intelligent management method based on edge-cloud collaboration and a related device, and the method comprises the steps: obtaining the real-time data of each battery cluster through each cluster-level edge controller in an edge layer, carrying out the preprocessing of the real-time data of each battery cluster, and obtaining the real-time data of each battery cluster; calculating the real-time SOC, the state of health SOH and the maximum chargeable / dischargeable power of each battery cluster according to the preprocessed real-time data of the battery clusters; and at the cloud, correcting the calculated real-time SOC, SOH and maximum chargeable / dischargeable power of each battery cluster, generating a control power instruction of each battery cluster according to a correction result, an economical efficiency target and service life attenuation cost, and respectively issuing the control power instruction to a cluster-level edge controller of each battery cluster for execution. The method and the related device can improve the safety of the battery system.

The invention discloses a dynamic mapping virtual mailbox multiplexing control method and device and a storage medium, and the method comprises the steps: creating a plurality of software queues in an RAM, taking each software queue as a software carrier of a logic mailbox, and dividing the logic mailbox according to message priority or CAN ID; when the idle physical mailbox is detected, dynamically selecting a message to be sent from all the software queues, and loading the message to be sent to the idle physical mailbox; and after detecting that the sending of the physical mailbox is completed and the interruption is triggered, selecting the next to-be-sent message from all software queues and loading the next to-be-sent message to the physical mailbox which triggers the interruption, so that the utilization rate of physical mailbox resources of the CAN controller can be effectively improved, the problem of scheduling starvation of low-priority messages caused by accumulation of high-priority messages is avoided, and the service life of the CAN controller is prolonged. The instant multiplexing of the mailbox and the fair and efficient message sending are realized, and the system resource utilization efficiency and the communication reliability are obviously improved.

The invention provides an OBD message analysis and attitude rendering method and system based on a vehicle dynamics model, and belongs to the field of vehicle electronics and control. The method comprises the steps that a message is analyzed through an OBD interface, and vehicle operation parameters are obtained; establishing a unified time base and carrying out resampling and synchronous processing on the data of each channel; constructing a fifteen-degree-of-freedom vehicle dynamics model comprising a vehicle body six-degree-of-freedom pose, a vehicle body angular velocity, a four-wheel rotation angular velocity and unsprung mass vertical displacement for state prediction; designing an observation function to map a model state to an OBD observation space, and adopting an observability enhancement strategy; predicting and observing data are fused by using a nonlinear filter, and abnormal observation gating is carried out based on a mahalanobis distance and an amplitude threshold value; compensating system time delay and adaptively adjusting observation noise; and performing three-dimensional real-time rendering on the attitude information. According to the method, high-precision and high-robustness vehicle attitude estimation can be realized only by depending on the OBD message, and the system cost is effectively reduced.

The invention relates to an aircraft data transmission method and system based on a security network. The method comprises: receiving data from an airborne device via an avionics network, where the data is unidirectionally received via the avionics network over an interactive network bus, and where the unidirectional receiving is effected by the information system configuring an interactive network port as a receiving port; an acknowledgement message or a negative acknowledgement message of the data is transmitted to the onboard device via a peer-to-peer bus.

The invention relates to the technical field of flexible electronic sensing, and particularly discloses a composite fiber membrane-based capacitive flexible pressure sensor integrated system and a preparation method thereof. The sensor is composed of a composite fiber membrane sensitive layer, an interlayer type electrode structure, a multi-channel signal acquisition module and an intelligent data processing system. Wherein the composite fiber membrane is prepared through an electrostatic spinning technology, polyvinylidene fluoride serves as a matrix, ionic liquid with the mass ratio of 40%-70% is evenly dispersed, a three-dimensional porous structure is formed, and a pressure signal is converted into capacitance change through the double-electric-layer capacitance effect; the signal acquisition module adopts a high-precision capacitance digital converter to cooperatively work with a microcontroller, 9-channel parallel data acquisition is realized, the resolution reaches 6aF, and data is transmitted through an anti-interference bus protocol; and the data processing system dynamically analyzes the pressure-capacitance relationship based on an exponential function model, suppresses noise to be below 0.1 aF RMS in combination with a filtering algorithm, and synchronously generates a visual pressure distribution map.

The invention provides a multi-ring state sensing communication network optimization method, relates to the field of industrial network communication, and solves the technical problems of communication uncertainty and insufficient system reliability caused by message conflicts in the prior art. The method comprises the following steps of: when a communication system is initialized, logically dividing a plurality of nodes into a plurality of data transmission rings by a centralized management node on a single physical bus, and initializing an annular frame for controlling a sending permission for each transmission ring; each node transmits a token based on the ring frame, and after the nodes in the ring obtain the token of the ring, the nodes obtain the bus sending authority, construct a data frame containing a target node address and send the data frame to the bus to perform data communication between the nodes; each node continuously detects communication states of adjacent nodes and a transmission ring through a heartbeat mechanism and a ring frame timeout mechanism; and automatically triggering a data ring reconstruction process and updating a token transmission path when detecting that the node fails, the node is added or the centralized management node is disconnected.

Systems, methods and apparatus of vehicle control. For example, a vehicle includes: a multi-master serial bus (e.g., a controller area network (CAN) bus); electronic control units connected to the bus and configured to communicate with each other through the bus; a transceiver connected to the bus and configured to monitor communication traffic on the bus to generate inputs; and an artificial neural network configured to generate, based on the inputs, a classification of anomaly for the communication traffic on the bus. The vehicle is configured to apply a security measure in response to the classification of anomaly for the communication traffic on the bus.

An example operation includes one or more of receiving a request from a first ECU disposed on a virtual bus, wherein the request identifies data to be obtained from a second ECU, generating a subscription between the first ECU and the second ECU for the identified data via a framework of a virtual bus, receiving a data frame which is published by the second ECU, and forwarding the data frame published by the second ECU to the first ECU on the virtual bus based on the generated subscription.