44results about How to "Reduce fault detection time" patented technology

The communication device has a frame transfer unit that executes frame transfer via the first communication link and the second communication link, a link confirmation frame sending unit, and a return link confirmation frame monitoring unit. The link confirmation frame sending unit causes the frame transfer processing unit to send a link confirmation frame for use in confirming a normal link status via the first communication link from the communication device to the counterpart communication device. The return link confirmation frame monitoring unit performs fault detection of the first and second communication links by monitoring a return link confirmation frame which is to be returned from the counterpart communication device to the communication device via the second communication link when the counterpart communication device receives the link confirmation frame via the first communication link.

Provided are a method, device and system for processing a fault in at least one distributed cluster. At least one distributed cluster comprises a first distributed cluster, and the first distributed cluster comprises a first Master node, a first Slave node, a first reference node, and a first backup node serving as a backup of the first Master node. The first backup node receives a heartbeat message which is sent by the first reference node and comprises first indication information used for indicating that the first reference node and the first Master node are in a disconnected state; according to the first indication information, the first backup node determines that the first reference node and the first Master node are in a disconnected state; when it is detected that the heartbeat message sent to the first backup node by the first Master node is interrupted, the first backup node determines that the first backup node and the first Master node are also in a disconnected state; and the first backup node determines that the first Master node is faulty. In the embodiments of the present invention, fault detection time can be effectively shortened.

The invention discloses a vehicle body controller fault test method and a system based on an industrial personal computer. The system comprises an industrial personal computer (100), a vehicle body controller (200) with an interface circuit board (400), a programmable power supply (300) and a data transmission device (103). The industrial personal computer (100) is used for simulating a group of input signals for a fault test on the vehicle body controller (200) when a vehicle body controller fault test instruction is received. The data transmission device (103) is used for inputting the group of input signals to the vehicle body controller (200) via the interface circuit board (400). The data transmission device (103) is also used for receiving a group of output signals outputted by the vehicle body controller (200) via the interface circuit board (400) and inputting the group of output signals to the industrial personal computer (100). The industrial personal computer (100) is also used for acquiring a fault test result for the vehicle body controller (200) through carrying out waveform feature analysis on the group of output signals.

The invention relates to a detection method for a cable grounding fault. A method for detecting a grounding fault of a bridge cable, which includes: connecting one end of the faulty cable to the output end of a DC stabilized power supply, and the other end to be short-circuited to any other intact phase cable; connecting the output end of the DC stabilized power supply to the other The other end of any phase cable; turn on the DC stabilized power supply to keep the output current stable at 5-10A; use a DC voltmeter to measure the values ​​V1 and V2 of the voltage range of the two ends of the faulty cable to the bridge frame; The rough position of the fault point of the cable can be calculated; then the DC stabilized power supply is released, and one end of the resistance gear of the multimeter is connected to one end of the faulty cable, and the other end is grounded; the insulating rope is used to trap the faulty cable near the rough measurement position and move. When the resistance value of the multimeter points to the maximum value, that is, the position where the insulating rope moves is the fault point. The invention can be used for fast and accurate detection of the grounding fault point of the cable laying bridge.

An embodiment of the invention provides a method of realizing a heartbeat mechanism, an apparatus and a system thereof. A quantity of heartbeat responses sent by a node can be reduced so that unnecessary resource occupation cost in a distributed database system can be decreased. The scheme comprises the following steps that an exchange node acquires a heartbeat request sent by a first node to a second node, wherein the heartbeat request includes an identification of the first node and an identification of the second node; the exchange node records and receives a first moment of the heartbeat request; the exchange node inquires a second moment of receiving a second node sending message most recently by the exchange node in buffer memory information according to the identification of the second node, wherein the buffer memory information stores a corresponding relation of a moment for any one node to send a message and the identification of the node and the moment is received by the exchange node; and if an absolute value of a difference value between the first moment and the second moment is less than a threshold, the exchange node sends the heartbeat responses to the first node.

The invention discloses an implementation method of hybrid AC/DC distribution network protection, which comprises a central unit and a plurality of local units communicated with the central unit. Theimplementation method comprises the following steps: each local unit adds a time mark to analog sampling data and then sends the analog sampling data to the central unit with switching values, event information and tripping information together, and the central unit determines a fault point of a hybrid AC/DC distribution network according to the received data, and feeds back the tripping information and latching information to an associated local unit according to the fault type of the fault point so as to implement fault isolation of the associated local unit. The implementation method provided by the invention can keep the stable operation of an AC/DC system to the greatest extent, guarantees the normal power supply of non-fault regions in an AC/DC hybrid system, and reduces the power failure time and the low-voltage running time of a user so as to have very high application value.

The invention provides a port fault detection circuit. The port fault detection circuit comprises at least one repeater circuit and a processor. The at least one repeater circuit is connected with an output circuit of a port to be detected and an input circuit of the port to be detected and/or an output circuit of another port to be detected and an input circuit of the port to be detected. The processor is used for comparing a first signal acquired from the input circuit of the port to be detected with a first threshold, when the difference between the first signal and the first threshold is larger than a second threshold, it is determined that the port to be detected is faulty, wherein the first signal is a signal received by the repeater circuit from the output circuit of the port to be detected and passing through the input circuit of the port to be detected or is a signal received by the repeater circuit from another port to be detected and passing through the input circuit of the port to be detected. According to the invention, problems that the port detection cost is too high, and the detection efficiency is relatively low are solved; when the port is detected, external extra loads are not needed; by means of the connected repeater circuit, the fault port and the fault circuit can be positioned quickly.

The invention discloses a method and equipment for detecting a link fault. The method includes the steps that the detection device of network equipment detects that a first numerical value of the voltage of an interface is changed into a second numerical value; the detection device of the network equipment generates an interruption signal and outputs the interruption signal to a controller of the network equipment; after receiving the interruption signal, the controller of the network equipment determines fault point information corresponding to the interface and determines that a link corresponding to the fault point information breaks down. According to the method and equipment, fault detection time can be shortened, whole network fault perception is accelerated, and convergence time of whole network services is shortened.

The invention performs deep analysis on fault detection behaviors of process monitoring and studies change conditions of statistics when a fault happens and looks for an effective method to avoid missed detection of the fault and solve problems that monitoring statistics are not uniform and the like and looks for an effective method to improve the performance of fault diagnosis. Based on study work at present, we find that specific hidden variables which cannot be obtained through direct measurement may include characteristic information of a specific process fault and through measurement of a changing tendency of some statistics, the hidden variables which include the characteristic information are determined so that loss of useful information during statistical process monitoring can be prevented effectively and process monitoring and fault diagnosis effects can be improved. The process monitoring improvement algorithm improves the performance of the process monitoring significantly and included are mainly the following aspects: 1. fault detection time is reduced so that it is convenient for a process fault to be found timely and thus system operation risks are reduced; 2. the missed detection rate for faults, particularly some faults which cannot be detected through traditional methods is reduced; 3.loss of useful information can be prevented effectively so that conditions are provided for further fault diagnosis and fault clearing.

The invention discloses a fault detection instrument of an electromobile and a fault detecting method. The instrument comprises an aerial socket,a gear selecting switch,a detection convertor,a speed controller and an instrument shell body of a voltage displayer electrically connected with the detection convertor. The gear selecting switch comprises a forward gear,a back gear and a stop gear whichcorrespond to forward,back and stop gears of the electromobile. The speed controller corresponds to an electronic throttle of the electromobile and comprises a potentiometer and a rotary knob linked switch. A first gear detecting circuit,a second gear detecting circuit,a third gear detecting circuit,a fourth detecting circuit,a fifth detecting circuit and a sixth detecting circuit which respectively detect battery set voltage,electronic throttle power supply voltage,electronic throttle speed changing voltage,stop gear voltage,forward gear voltage and back gear voltage are correspondingly connected with the detection convertor and the aerial socket. The detecting method that the instrument is in communication with the interface of a controller is adopted,based on the detecting circuits,theinstrument detects whether or not faults exist in the controller,and the detection is quick,comprehensive and high in universality.

The invention discloses an SSTDR-based handheld cable fault detection system and method, and belongs to the field of line detection. The method uses an SSTDR method for building hardware models for signal loading, receiving, collection, processing and the like of a detection system; the cable fault positioning, fault type judgment and uninterruptible power online detection are realized; a power supply department is helped to timely and accurately discover and eliminate the fault and to conveniently perform operation inspection work; the power supply reliability is improved. The system and themethod are suitable for the detection and position of the cable gap fault; the cable can be reliably detected under the condition of not interference the normal work signals; the cable fault positioning, fault type judging and uninterruptible power online detection are realized; the system and the method help the power supply department to timely and accurately discover and eliminate the fault; the operation and inspection work is convenient; the power supply reliability is improved.

The application discloses an intelligent voltage fault detecting device, which comprises a surge voltage detecting module, an operation overvoltage detecting module, a fault alarm module, a main control module, a communication module and a power module, wherein the surge voltage detecting module and the operation overvoltage detecting module are connected with the same line in a power grid respectively, the surge voltage detecting module is connected with the fault alarm module and the main control module by means of high-speed optocouplers respectively, the operation overvoltage detecting module is connected with the fault alarm module and the main control module by means of optocouplers respectively, and the main control module is connected with a main station by means of a communicationmodule. The intelligent voltage fault detecting device can detect an operation overvoltage fault with a small voltage value and long duration and a transient surge voltage with a great voltage valuein a targeted manner respectively, and activates the fault alarm module by means of the high-speed optocouplers and the transient, so as to identify the overvoltage condition in the line quickly and automatically, thereby being convenient for taking troubleshooting measures timely, being conductive to shortening the fault detection time and improving the fault detection efficiency.

The invention discloses a crash consistency fault detection method and system for a persistent memory concurrent program, and the method comprises the steps: S1, carrying out the instrumentation of a memory access instruction in a to-be-detected persistent memory concurrent program and a persistent memory related interface through a compiler, and obtaining an executable program; S2, according to an input rule of the to-be-tested persistent memory concurrent program, generating a plurality of input parameters as input of an executable program to form an input parameter set; S3, separately acquiring a memory access mode corresponding to a persistent memory address accessed by each memory access instruction in the executable program under each input parameter, and controlling the executable program to generate a memory access time sequence of writing first and then reading, and then controlling the memory access mode corresponding to the persistent memory address accessed by each memory access instruction in the executable program; determining whether a mode of writing a persistent memory based on unpersistent data exists in each memory access mode, and if so, determining that a consistency fault exists. According to the method, the consistency fault in the persistent memory concurrent program can be efficiently and accurately detected.

The invention provides a self-detection method for a rotating mechanism control system in an airborne photoelectric detection device. The method comprises the self-detection of a control element, a control circuit board and the shafting friction moment uniformity. An angle measurement coded disc, a speed measurement gyro, a power supply board and a power amplifier board are provided with hardware self-detection signals. Whether the work is normal is judged by reading a hardware self-detection signal. A motor does not have a self-detection signal. On the basis of normal work of the angle measurement coded disc, the power supply board and the power amplifier board, a positive force is applied to the motor. If increased coded disc angle is detected, the motor is normally works. When the motor is detected, the coded disc differential speed is calculated in real time. If the differential speed of a position is less than a certain threshold, the friction torque of the position is too large. Through the detection method, whether all parts of the control system normally work can be quickly acquired, so as to timely carry out abnormal protection measures; the fault detection time is reduced; and the detection efficiency is improved.