173 results about "System Fault Tolerance" patented technology

The invention relates to a Raft-algorithm-based block chain consensus mechanism. The mechanism comprises: consensus node information of a block chain is stored into the block chain and an initial state of a consensus node is set to be a follower state; on the basis of a Raft algorithm, a consensus node of an initial leader state is selected by combining the height of the block, wherein the consensus node of the leader state is used for recording a transaction event and generating a new block; and at the end of the term of the consensus node of the leader state, a consensus node of a leader state is selected again. Because the height of the synchronous block is considered for reference during the consensus node selection process of the leader state, the consensus efficiency can be improved and the transaction confirmation time can be shortened; and because the consensus node is selected again at the end of the term, the system fault tolerance can be improved. Moreover, on the basis of uniqueness of the consensus node selection of the leader state, each block has final consistency, thereby avoiding block chain furcation. Meanwhile, dynamic entrance and exit of a consensus node can be realized based on a management mechanism of the consensus node by an intelligent contract.

A universal gateway that allows data to be transferred between one or more network protocols and one or more control protocols is described. The various protocols can coexist on the same physical network medium or on separate networks. The gateway also provides tunneling of network protocols through a selected protocol, and centralized control of network nodes. By using the gateway, end-users can mesh together traditionally standalone, incompatible, networks into a universally accessible, centrally administered, “super-network.” The gateway provides a centralized node database, support for legacy protocols, a rules engine, and an object-oriented class library interface. Configuration is simplified through automatic device discovery. The centralized node database is managed by an active server node. High reliability access to the centralized node database is enhanced by the system fault tolerance provided by standby server nodes. When used in connection with a power line network, the gateway provides the ability to distribute various types of data streams over the power line. Routing handlers provided by the gateway allow virtually any of the legacy data networking services such as TCP/IP to be routed over the power-line.

A stand alone Redundancy Management System (RMS) provides a cost-effective solution for managing redundant computer-based systems in order to achieve ultra-high system reliability, safety, fault tolerance, and mission success rate. The RMS includes a Cross Channel Data Link (CCDL) module and a Fault Tolerant Executive (FE) module. The CCDL module provides data communication for all channels, while the FTE module performs system functions such as synchronization, data voting, fault and error detection, isolation and recovery. System fault tolerance is achieved by detecting and masking erroneous data through data voting, and system integrity is ensured by a dynamically reconfigurable architecture that is capable of excluding faulty nodes from the system and re-admitting healthy nodes back into the system.

The invention relates to a batch processing request-based Microsoft SQL server database cluster. The cluster consists of two parts, wherein a gateway and backups thereof are arranged at the front end of the cluster, and two or more of database server nodes are arranged at the rear end of the cluster; each node is provided with a structured query language (SQL) Server example and a cluster proxy and is not provided with a shared disk structure; and each node has an independent and consistent data set, and the cluster is only provided with a host. The gateway is used for managing the integral cluster; and for each client link, the gateway opens a database link corresponding to each node simultaneously to receive, analyze and optimize all client requests, wherein the client requests are divided into two classes, namely the read-only query requests and the data updating requests; for the read-only query requests, the gateway sends the requests to any one node to execute the requests according to a set load balancing algorithm so as to realize the real database access load balancing and improve the performance of a system; and the updating requests are sent to the host of the cluster to be executed, and are subjected to synchronous data by the host to other nodes to keep the data set of each node real-time and consistent, eliminate a single-point fault source and realize system fault tolerance. The integral cluster can improve the performance, availability and reliability of the system obviously and solve various problematic issues of the performance, single-point faults, zero data loss and the like in the field of databases, and is a comprehensive database cluster scheme.

A weld joint automatic tracking control method and system based on magnetic controlling arcs and laser vision sensing mainly solves the technical problem that an existing space weld joint is low in automatic real-time tracking accuracy, not good in system fault tolerance and the like. According to the key points of the technical scheme, all deviation information, obtained by a magnetic controlling arc sensor (10) and a laser vision sensor (11), of the butt welded seam center of a welding gun (1) is input to a tracking system central control unit (8), information processing is conducted through a double-sensing estimating, examining and correcting fusion method, infused deviation information is taken as weld joint deviation regulating amount of an executing mechanism, the executing mechanism executes weld joint deviation regulating, weld joint automatic tracking is achieved, and the automated welding is completed. The weld joint automatic following control method and system is mainly used for weld joint automatic tracking.

The invention discloses an electric vehicle driving and charging system with fault tolerance and a fault reconstruction method. The system comprises a vehicle battery, a dual three-phase converter, an open winding motor, fault-tolerant switches, and charging switches. The vehicle battery is connected to the DC side of the dual three-phase converter. The open winding motor is of a split winding structure. The center point of each phase of winding is connected to the corresponding charging switch. The fault-tolerant switches are connected to the two ends of the corresponding phase of winding of the open winding motor. During normal operation, the vehicle battery controls the open winding motor through the dual three-phase converter to realize a driving function. Three-phase AC power is reversely fed by the dual three-phase converter to charge the battery through the charging switches and the open winding motor of a split winding structure. In the fault-tolerant operation process, after an open-circuit fault of one or two phases of bridge arms of the dual three-phase converter, the corresponding fault-tolerant switches reconfigure the topology of the dual three-phase converter. Through corresponding driving and charging control, the functions of driving and charging after system fault tolerance are realized.

Fault tolerance is provided in a distributed system. The complexity of replicas and rollback requests are avoided; instead, a local failure in a component of a distributed system is tolerated. The local failure is tolerated by storing state related to a requested operation on the component, persisting that stored state in a data store, such as a relational database, asynchronously processing the operation request, and if a failure occurs, restarting the component using the stored state from the data store.

The invention provides an operating system fault tolerance testing system and an operating system fault tolerance testing method based on fault injection. The testing system mainly comprises a data processor, an integrated fault injection platform, a reference testing operation controller, an interceptor, a monitor and a target machine with an operating system to be tested and a database. By using the testing system and the testing method, under the situation that a fault exists, a classified, reusable and comprehensive method can be provided to comprehensive check and measure the behavior of the operating system, the testing goal is explicit, the testing process is clear and comprehensive, the designed types of faults cover analog hardware faults, operating system faults and system component faults, the weak point of the system can be found under the situation that the fault exists, the aspects of the system which are required to be adjusted and improved to enhance fault tolerance can be pointed out, and even the structure of the system can be adjusted to achieve a proper fault tolerance level.

The invention discloses an embedded system assessment method based on fault injection. The fault injection is realized by utilizing a hardware interface and an operation system interface and according to the embedded system platform hierarchical model; after the fault injection, a qualitative analysis is carried out for the performance of the system under an abnormal state, the system performance is assessed respectively on two aspects: system failure and task failure. The embedded platform interface is adopted to carry out fault injection so as to effectively simulate hardware faults, operation system level faults and application level faults. After the fault injection, observation to the failure performance of a tested platform with some faults can assess the fault tolerance capability and anti-abnormality capability of the system and is good for carrying out fault forecast according to the failure performance. The application of the assessment method to the embedded system assessment can effectively simulate the realistic faults so as to analyze the system failure performances and assess the system reliability.

The invention discloses a distributed optimal cooperative fault-tolerant control method based on self-adaptive dynamic planning. The distributed optimal cooperative fault-tolerant control method comprises the steps of: firstly, constructing a communication topology of a multi-agent system by means of communication links among agents, and representing the communication topology by a directed graphG=(V, E, A); secondly, establishing a local domain consistency error equation, and defining a failure-free cooperative control input quantity of the agent vi as ui based on an optimal control theory and a minimum value principle, so as to obtain a distributed optimal cooperative control law; thirdly, executing the distributed optimal cooperative control law; and finally, designing a distributed optimal cooperative fault-tolerant control law of the agents. The distributed optimal cooperative fault-tolerant control method can overcome the shortcomings of the existing nonlinear multi-agent systemfault-tolerant control method, and has a good application prospect in the fault-tolerant control of UAV formation.

The invention provides a decoupling SVPWM (space vector pulse width modulation) based fault tolerance control method for an open-winding PMSM (permanent magnet synchronous motor) driving system. The method includes when a bridge arm of double inverters has an open-circuit fault, switching on a bidirectional thyristor between a motor phase endpoint, connected with the faulted bridge arm, and a direct-current-side filter capacitor midpoint to realize reconstruction of a topological structure; performing fault tolerance control on the reconstructed topological structure on the basis of decoupling SVPWM, performing SVPWM control on the inverter on the faulted side on the basis of a 90-degree coordinate system, and performing SVPWM control on the inverter on the normal side on the basis of a three-phase coordinate system with a, b and c phases. Compared with the prior art, the decoupling SVPWM based fault tolerance control method has the advantages that procedures after fault tolerance are simplified greatly, reference voltage vectors are proportionally distributed according to effective sectors of maximum output voltages of the inverters on the normal side and on the faulted side, and the utilization ratio of direct-current-side voltages of the inverters is maximized.

The invention discloses a non-linear multi-unmanned-aerial-vehicle-system fault-tolerance formation control method with consideration of random disturbance. The method comprises the following steps that: a non-linear random dynamic model of an unmanned aerial vehicle is constructed and output measurement data of each unmanned aerial vehicle are obtained based on the model as well as reference track given information and information interaction between neighboring unmanned aerial vehicles; on the basis of the data, a distributed state observer and an adaptive fault estimator are designed for each unmanned aerial vehicle and on-line estimation is carried out on state information and fault information of the unmanned aerial vehicle; a fault-tolerant controller is designed by using the real-time state and the fault estimation information, so that a system formation error, a state estimation error, and a fault estimation error are converged to a controllable error bound; and then correlated parameters of the distributed state observer, the adaptive fault estimator, and the fault-tolerant controller are determined. According to the invention, a problem of fault estimation and fault-tolerance formation control of a non-linear unmanned aerial vehicle group with existence of interference, noises and channel disturbance can be solved effectively.

The invention discloses an intelligent consensus mechanism based on a two-way certificate and suitable for an intellectual property alliance chain, and aims to improve the consensus efficiency, shorten the transaction confirmation time and improve the system fault tolerance by adopting two kinds of certificates, namely a right-interest certificate and a circulation certificate. And on the other hand, as the PBS executes PoW mining in turn, the consensus calculation of system nodes can enable each block to have final consistency, the condition of block chain bifurcation is avoided, and meanwhile, the block output stability is also guaranteed. In addition, a winning accounting right reward of the system node is given to users with more stock rights and high participation degree, so that theactivity of the community can be improved; And the authorized and credible common full node participates in consensus calculation, so that the credibility and the internal transparency of the alliancechain operation can be improved.

The invention discloses a three-drive spherical robot which comprises a circle spherical shell and a drive motor; wherein, a track is arranged on the inner surface of the spherical shell; an annular rack is arranged on the inner surface of the track; a walking bracket is connected with the track by a road wheel engaged with the rack; a walking bracket guide wheel is arranged on the walking bracket as well; the walking bracket is provided with a track motor and comprises a spherical frame as well; one end of the spherical frame is connected with the walking bracket by a bearing and the other end is connected with a rotating bracket by a long axis motor; a short-axis motor is axially arranged at the spherical frame; a heavy pendulum is axially arranged at the short-axis motor; the rotating bracket is connected with the track by the guide wheel arranged at the walking bracket. The three-drive spherical robot not only moves flexibly, but also realizes motion redundancy; under the situation that one of a track axis motor drive or a short axis motor drive goes wrong, the rest two drives can still be used for realizing omnidirectional rolling, namely realizing the system fault tolerance by a configuration design.

The invention discloses a four-wheel independent driving intelligent car system controlled by brain waves and a control method thereof. The system comprises an electroencephalogram (EEG) signal acquisition cap, an EEG signal processing program and a driving control system of a four-wheel independent driving electric car. A user makes corresponding motor imagery for different driving instructions. An electroencephalogram signal is extracted through the EEG acquisition cap and is transmitted to a computer. The computer carries out preprocessing, feature extraction and classification on the received EEG signal. A classification result is used as an instruction and is sent to the electric card driving control system through a wireless communication module. An intelligent electric car of four-wheel independent driving system fault tolerance stability control is realized according to a user brain wave processing result as an execution instruction. According to the system and the control method, the movement range of disabled people with severe dyskinesia can be greatly expanded, at the same time the system and the method can be used for training a motor imagery recognition system, a human-car interaction mode is provided for a user to access an automatic driving vehicle system, and the system and the method have good development and application prospects.

The invention discloses a driving system fault-tolerant control strategy of a distribution type driving electronic automobile. Under a condition that one wheel is failed, fault tolerant control on anautomobile is implemented according to the fault-tolerant control strategy; upper layer control refers to that a transverse swinging angle speed and a centroid mass deviation angle of the automobile are adopted as control targets, an automobile transverse swinging moment control system is established in case of a failure fault, and on the basis of a sliding mode variable structure control strategyfor constraint on the basis of the transverse swinging angle speed and the centroid mass deviation angle, an expected transverse swinging moment is calculated; lower layer control refers to that through control of a sliding mode variable structure or LQR (Linear Quadratic Regulator Control), dynamic and stable torque coordinate optimization allocation strategies are respectively achieved, together with the expected transverse swinging moment, allocation of wheel moments is calculated, moment reallocation of wheels working normally is implemented, and stable running of the automobile can be ensured. By adopting the strategy, moment reallocation of wheels working normally can be implemented, preset wheel paths can be met to the maximum extent, sudden situations can be avoided, and safe andstable running of automobiles can be ensured.

The invention provides a system fault tolerance method for a multiprocessor server. The system fault tolerance method for the multiprocessor server has the following specific steps: a system detects a fault of the processor and reports the fault of the processor to a monitoring and managing unit; the monitoring and managing unit analyzes and judges the fault; after the fault achieves a certain fault level, an interrupt request is sent to the system; and after the system receives the interruption, configuration degradation is carried out according to a fault-tolerance strategy which is formulated in advance. The above steps aim at the multiprocessor server. Compared with the prior art, the system fault tolerance method for the multiprocessor server has the characteristic of improving the system reliability by lowering the configuration as the cost, and has the advantages of strong practicality and easiness in popularizing.

The invention provides a fault tolerance management method of a multi-core operation system. The fault tolerance management method mainly comprises the steps of constructing an n*n inter-core fault detection array, periodically detecting the fact that other processor cores in the system have failure or not by utilizing the inter-core fault detection array through each processor core, wherein the fault detection of each processor core comprises the process of setting elements in a line k corresponding to each processor core in the inter-core fault detection array as TRUE at the beginning of each timing monitoring period; checking elements in a line J corresponding to each processor core in the array at the tail of each timing monitoring period, if one element e, J or k is not TRUE, judging that the processor core k corresponding to the line has fault, and finally completely resetting the elements in the line J. According to the system, each processor core has the capability of detecting faults of other cores in the processor, so that the fault tolerance capability is greatly improved.

The invention provides a self-adaption fault-tolerant train integrated positioning method. The self-adaption fault-tolerant train integrated positioning method includes the steps that a GNSS/INS tight-integration train integrated navigation positioning method based on a pseudo-range/pseudo-range rate is adopted to calculate the position and speed of an integrated train, and a measurement matrix and measurement noise covariance are calculated; according to the measurement matrix, the measurement noise covariance and an actual measurement value of a receiver, a test statistic value is calculated, and a test threshold is set; the test statistic value is compared with the test threshold, whether or not faults exist in a system is determined according to comparison results, and after it is judged that a satellite with a glitch exits, through a self-adaption fault-tolerant method, the position and speed of the integrated train are adjusted. By the adoption of the self-adaption fault-toleranttrain integrated positioning method, successive train position and speed information can be obtained; through an FDP method, the faults are detected, identified and correspondingly processed, and thefault tolerance of the system is improved; the self-adaption fault-tolerant train integrated positioning method is suitable for train real-time positioning and post-processing position calculation and analysis and has the advantages of being high in continuity and reliability.