135results about How to "Accurate fault detection" patented technology

An apparatus and method for detecting faults and providing diagnostic information in a refrigeration system comprising a microprocessor, a means for inputting information to the microprocessor, a means for outputting information from the microprocessor, and five sensors.

The invention relates to the field of wireless sensor networks and fault diagnosis, and discloses a method for carrying out fault diagnosis on wireless sensor networks. The method comprises the following steps: S1, carrying out online real-time acquisition on data measured by sensor nodes in a wireless sensor network; S2, detecting the fault of a single sensor node by using the space and time characteristics of the data; S3, detecting the fault of the whole wireless sensor network by using the correlation between two adjacent nodes; S4, carrying out attribute reduction on parameters obtained in the steps S2 and S3; and S5, obtaining a fault diagnosis result of the wireless sensor network according to the attribute reduction result obtained in the step S4. In the invention, the fault of a single sensor node is detected by using the space and time characteristics of data measured by sensor nodes in a wireless sensor network, and the rapid and correct fault detection on all nodes in the network by using the correlation between the nodes is realized.

A failure detection apparatus for a resolver outputting a sine signal indicative of sin θ and a cosine signal indicative of cos θ according to a rotational angle θ of a rotator, includes an inspection value calculating section configured to calculate an inspection value based on at least one of the sine signal and the cosine signal; a failure detecting section configured to judge whether the resolver is in a failure state or not on the basis of the inspection value; a counting section configured to gradually increase a count value with a lapse of time when the failure detecting section is determining that the resolver is in the failure state, and configured to gradually decrease the count value with a lapse of time when the failure detecting section is determining that the resolver is not in the failure state; and a failure deciding section configured to finally decide that the resolver has caused the failure on the basis of the count value.

An air bypass valve failure detecting device outputs an opening command to an air bypass valve when a throttle valve suddenly closes, thereby prevent surging from occurring in a second intake passage between a turbocharger and a throttle valve. When the opening command is outputted to the air bypass valve, failure detection for the air bypass valve is permitted only if an intake air quantity of an engine immediately before a closing command is changed to the opening command is equal to or larger than a predetermined value. Thus, it is possible to prevent the failure detecting device from erroneously determining that the air bypass valve is normal although valve closing failure of the air bypass valve has occurred. This is because, when the intake air quantity is smaller than the predetermined value, surging does not occur in the second intake passage even if the valve closing failure of the airy bypass valve has occurred.

A failure detection apparatus for preventing erroneous detection due to a degradation of a sensor and thereby accurately performing failure detection of a variable valve timing and lift control system is provided. The detection apparatus detects a failure of a variable valve timing and lift control system in an engine. The detection apparatus detects a vibration inside an engine cylinder, extracts the component of seating sound of the valve from the output signal of the sensor, determines an actual seating time of said valve from the component of seating sound, and calculates a target seating time of said valve based on at least one of a requested lift amount, a requested advance angle, and a requested open angle depending on the operating conditions. The detecting apparatus corrects the actual seating time for a stationary deviation between the actual seating time and the target seating time caused by degradation or unevenness of the sensor. The detecting apparatus determines a failure of the variable valve timing and lift control system by comparing the corrected actual seating time with the target seating time.

The embodiment of the invention discloses a fault detection method and device for a network path and network equipment. The method comprises the following steps: determining a target network path between an initiating device of path detection and a destination device of the path detection by a control plane; generating a detection message and path information, wherein the detection message is used for indicating the destination device to return a response message, and the path information comprises an identifier used for representing the target network path and a level; and transmitting the detection message and the path information to a forwarding plane, so that the forwarding plane transmits the detection message to the destination device through the target network path. By adopting the embodiment of the invention, the detection of the network path can be performed quickly and customer services are not affected basically.

An insulating state detection unit is configured to perform failure detection for switches, which connect a flying capacitor to a sample hold circuit for acquiring a charge voltage and a ground potential, by using a failure determination threshold value according to a variable value. That is to say, the insulating state detection unit is configured to decide the failure determination threshold value by taking, as a reference, a charge voltage of a capacitor of the sample hold circuit charged with electric charge amount corresponding to a charge voltage of the flying capacitor when the flying capacitor is charged with electric charge amount corresponding to an output voltage of a DC power supply.

A system for testing a memory page of a computer while an operating system is active. The system includes a hook function and a pattern generator. The hook function has software instructions that takes the place of a memory allocation / release scheme of the operating system. The system stores a test pattern generated by the pattern generator in the memory page upon receiving a request to release the memory page. Upon receiving a request to allocate the memory page, the system verifies the test pattern is correct to ensure the memory page is not defective. If the test pattern is incorrect, the defective memory page is removed from service.

The invention provides a tour inspection device with a 3D scanning function and a detection method of the tour inspection device. The tour inspection device comprises a laser transmitter, glass filters and CCD cameras and is characterized in that the CCD cameras arranged in an included angle mode are respectively provided with one glass filter, the laser transmitter and the CCD cameras are respectively connected with a PC storage processor, the device is carried on an unmanned aerial vehicle and detects overhead lines and pole towers from different angles. Compared with the prior art, the tour inspection device with the 3D scanning function can obtain three-dimensional images and size data of a detected device from different angles, is beneficial to judging the running state of an electrical device, can detect faults clearly, accurately and rapidly in all directions, and ensures normal running of electric transmission lines.

An amplifier failure detection apparatus for a radio transmitter that has a function for compensating for amplifier distortion of the radio transmitter and a function for determining amplifier failure has occurred by detecting that the gain of an amplifier has dropped a set level or more, in which: a gain-detection unit detects the gain of the amplifier; an alarm-detection-level-generation unit, which has a table for storing alarm-detection levels that correspond to input-amplitude levels, generates an alarm-detection level that corresponds to an input-amplitude level; and a comparison unit compares the gain detected by the gain-detection unit with the alarm-detection level, and generates an alarm based on the comparison results.

In a motor control unit, a current-carrying failure detection unit determines a first determination condition and a second determination condition. The current-carrying failure detection unit measures a duration of a state where the first determination condition is satisfied, and a duration of a state where the second determination condition is satisfied. When the first or second duration exceeds a predetermined reference period, the current-carrying failure detection unit determines that a current-carrying failure has occurred.

A battery-assisted bicycle includes a driving unit that accurately detects a failure in each of a torque detector, a crank rotation detector, and a motor rotation detector. The driving unit includes a crankshaft to which pedals are to be connected, a motor rotation detector that detects rotation of an electric motor, a torque detector that detects a torque generated at the crankshaft, a crank rotation detector that detects rotation of the crankshaft, and a sensor failure detector that detects a failure in at least one of the motor rotation detector, the torque detector, and the crank rotation detector based on detection results from the motor rotation detector, the torque detector, and the crank rotation detector.

An engine control system including an engine controller, a plurality of sensors coupled to the engine controller, and a neural network operating in the engine controller, and where upon failure of at least one of the plurality sensors, the neural network generates a representative value of the failed sensor.

The invention provides an indoor intelligent mobile robot and a control method. The global advancing path of the robot includes a plurality of key point positions of the path; when an obstacle existsin the advancing path, an obstacle avoidance point is arranged out of the original path, a local path of the robot advancing to the obstacle avoidance point from the current key point is planned, andafter the robot advances to the obstacle avoidance point along the local path, a local path of the robot advancing to a next key point from the obstacle avoidance point is planned again; and if a newobstacle appears during the process of the robot advancing along the local path, another obstacle avoidance point is set. A three-dimensional lidar is adopted for laser oblique shooting, the scanningpoint of the laser avoids a dynamic obstacle, and thus, laser data reflecting the surrounding environment information are acquired for building a surrounding environment map. Trackless autonomous navigation in an indoor complex environment with human mobility can be realized.

a mode change switch 3 which changes an automatic shift mode and a manual mode, an up-shift switch 4, and a down-shift switch 5 are provided. The mode change switch 3 outputs an output of the normal-open contact point P2 as a manual mode signal to a controller 1 in operating the manual change switch 3, while an output of the normal-closed contact point P4 is outputted to an input side of the up-shift switch 4 at non-operation thereof. The up-shift switch 4 and the down-shift switch 5 are provided with the normal-open contact points P12, P22 which output an up-shift signal commanding an up-shift or a down-shift signal commanding a down-shift in operating the switch, and the normal-closed contact points P14, P24 which output a monitor signal at non-operation thereof.

The method includes steps: S102, connecting ports of signaling flow sub card (SFSC) and media flow sub card (MFSC) in board to be tested to backboard; S104, making loop for each port of SFSC and each port of MFSC; S106, through port located between SFSC and CPU and port located between MFSC and CPU, CPU sends out data packets (DP) as well as receives DP from the port, which sends out DP; S108, carrying out comparison between number of DP sent from the port, which sends out DP, and number of received DP of containing same port label; if the sent number is identical to received number, then the method determines that port of board to be determined works normally; otherwise, there is fault in the port of board to be determined. Implementing fault detection for quick switching chip in high efficiency and low cost, the invention can detect fault port in a switching chip precisely. The invention is suitable to fault detection for batch product of a switching chip especially.

A power steering apparatus has a steering power assisting system coupled to tire wheels and a variable gear transfer system coupled to a steering wheel. The steering power assisting system includes a torsion bar rotation sensor and a first actuator rotation sensor to calculate a first pinion angle and a second pinion angle based on the detected rotation angles, respectively. The variable gear transfer system includes a steering sensor and a second actuator rotation sensor to calculate a third pinion angle based on the detected rotation angles. Sensor failure is detected by comparing the calculated first, second and third pinion angles.

The invention discloses a bearing fault detection method and device. The method comprises that a vibration signal of a bearing is obtained, and preprocessed to obtain a vibration sequential signal to be processed; the vibration sequential signal to be processed is input to a pre-trained fault classification model to obtain a fault classification result of the bearing vibration signal; and the type of highest probability among all the classification results is the detected fault type, and bearing fault detection is completed. According to the method, vibration signal values sampled continuously according to the time sequence is used as a training sample for convolutional neural network directly, a signal feature extraction step in traditional fault recognition is not needed, influence of feature extraction on accuracy of a fault identification result is reduced, parameter training is carried out the whole network in a monitored way by combining labels, and thus, accurate bearing fault detection is realized.

A circuit device includes a differential input-to-single-ended output first amplifier, to an inversion input terminal of which, of first and second signals forming differential signals, the first signal is input and to a non-inversion input terminal of which the second signal is input, a differential input-to-single-ended output second amplifier, to a non-inversion input terminal of which the first signal is input and to an inversion input terminal of which the second signal is input, and a failure detection circuit that performs failure detection on the basis of an output signal of the first amplifier and an output signal of the second amplifier.

The invention discloses a few-mode optical fiber fault detection method based on high-order mode backward Rayleigh scattering, and belongs to the technical field of optical fiber fault detection. Theinvention aims to solve the problem of low sensitivity caused by fault detection of the few-mode fiber by only utilizing Rayleigh scattering of the fundamental mode back direction, and the fault eventpositioning of the few-mode fiber link cannot be accurately and effectively realized. An evaluation standard with rayleigh scattering at the back of a few-mode fiber high-order mode as fault detection is provided. By means of the characteristic of high detection sensitivity of the few-mode fiber high-order mode, effective characterization of different fault amplitude loss events can be achieved,comprehensive evaluation of few-mode fiber link fault events is achieved, and a powerful guarantee is provided for simple and accurate fault detection of few-mode fiber links.

The invention relates to the field of power monitoring, in particular to an ultrahigh-tension line fault detection and location method and a fault detection and location device. The method comprises the following steps: sampling the current phase information at the two ends of a high-tension line to be detected at the same time respectively to obtain phi1 and phi2; calculating difference between phi1 and phi2 to obtain the difference psi=phi1-phi2; setting an alarm value, wherein when psi is greater than the alarm value, the high-tension line to be detected has fault; and after judging that the high-tension line to be detected has fault, sending fault information to the outside. The fault detection and location device comprises a fault detection module, a fault analysis module and a fault signal output module, wherein the fault detection module comprises a local end measurer as well as an opposite end measurer; the local end measurer and the opposite end measurer are connected to the fault analysis module respectively; and the fault analysis module is connected with the fault signal output module. According to the invention, the fault detection for the high-tension line is simple, accurate, quick and the like, the workload of line searching can be effectively reduced, and the fault repairing time can be shortened.

The invention discloses an energy-saving operation control device of an air conditioner and a control method thereof. The control method is characterized in that an air conditioner energy-saving operation control model or program using the operation running action, the indoor environment temperature and humidity, the electricity consumption and the operation time of the air conditioner as the basis is arranged in an intelligent controller, and the intelligent controller is used for carrying out the energy-saving operation control on the air conditioner. The control device comprises a remote control signal receiving and emitting circuit, a power consumption detection circuit and the intelligent controller and an environment temperature and humidity detection circuit, wherein the remote control signal receiving circuit and the environment temperature and humidity detection circuit are respectively connected with the corresponding input end of the intelligent controller. The intelligent energy-saving operation control device of the air conditioner and control method thereof have the advantages that the work condition or the fault of the air conditioner can be judged, in addition, the air conditioner can operate in an energy-saving state, the formation of a control system is simple, the implantation is easy, and practicality and validity are realized.

A directional indicator system includes a directional indicator that includes a plurality of LED series circuits each connected in parallel to another of the LED series circuits. Each LED series circuit includes LEDs connected in series. A driver is configured to control driving of the directional indicator. The driver includes LED drivers that are each configured to drive a corresponding one of the LED series circuits. The driver also includes a plurality of current detectors that are each configured to measure a value of a current in a corresponding one of the LED series circuits.

Provided are an optical network fault detection device based on noise signals and a detection method thereof. The device is characterized in that a noise source and a signal processing unit are arranged in a main optical fiber between an optical line terminal and an optical distribution network unit. The noise source includes spontaneous radiation noise amplified by an online optical amplifier or introduced noise signals and is located on the side of the optical line terminal. The method includes utilizing spontaneous radiation noise amplified by the optical amplifier in an optical fiber main line or introduced noise signals, conducting detection by coupling a wavelength division multiplexer into branches of the optical network, filtering optical signals of corresponding branches to be detected through a reflection type adjustable filter, conducting relative processing on returned detection signals and reference signals in the signal processing unit and achieving fault location through relative peak value of relative curves. The device and the method utilize noise wideband characteristics to achieve proper online location detection of the wavelength division multiplexing passive optical network, and are simple in structure, convenient to operate and accurate in optical network fault detection.

In this apparatus, maintaining control (time t1 to t2) which instructs fixing of the open timing VVT of an intake valve is executed in a predetermined low load state. Subsequently, there are executed changing control which instructs changing of the open timing VVT by a predetermined amount (time t2), and maintaining control which again instructs fixing of the open timing VVT of the intake valve (time t2 to t3). An intake-valve control apparatus is determined to be “anomalous” when an change amount Δave (=ave2−ave1) between the average ave1 of a large number of sample values of ΔMFBβ (combustion percentage increase amount within a predetermined crank angle range in an expansion stroke) during the maintaining control before execution of the changing control and the average ave2 of a large number of sample values of ΔMFBβ during the maintaining control after execution of the changing control is less than a predetermined value C.

The invention concerns a testing method detecting misconnected mechanical contacts between off-chip antenna and on-chip antenna circuit, wherein the testing method is a Built-In Self-Test method including a step of measuring at least one electrical parameter of on-chip antenna circuit connected to off-chip antenna which is representative of state of connection of said mechanical contacts.

The invention discloses an electric equipment fault detection method and device. The method is characterized by recording a start time point of electric equipment entering a work state, recording cumulated time after the start time point and recording continuous working time of the electric equipment working continuously after the start time point; and when the cumulated time is not larger than a preset period time and the continuous working time is larger than preset time, giving a prompt message for reminding that the electric equipment has fault. When fault detection is carried out through the electric equipment fault detection method and device, fault detection of the electrical equipment is carried out through a mode of judging whether the continuous working time of the electric equipment in the preset period time surpasses the preset time instead of an original mode of judging whether electrical parameters vulnerable to external interference are normal; if the electric equipment has fault, the fault reminding is given; and since the continuous working time is not easy to be affected by the outside world, fault detection can be carried out accurately based on the continuous working time and the preset time, and detection accuracy is improved.