3621 results about "Operational reliability" patented technology

The invention relates to the technical field of running state monitoring of wind generating sets, in particular to a system and a method for evaluating the running state of a wind generating set. The evaluating system mainly comprises a monitoring module, a quantifying module, a weight confirmation module and an evaluating module; data monitored in real time by a wind generating set control system are utilized as the input of the evaluating system of the real-time running state; then the data are quantified to obtain a real time deterioration degree of each evaluating index; finally, when the deterioration degree of a single item evaluating index and a permissible value have greater deviation, the serious evaluating result is directly given, otherwise, the weight module and the evaluating module are used for calculating an evaluating result of the running state of the generating set, and the evaluating result is used as the output of the system. The invention provides scientific basis for state maintenance of the wind generating set, and provides technological supports for ensuring high-efficient, reliable and safe running of the wind generating set, evaluating and forecasting the operational reliability of an electric power system of a windy electric field, and has important engineering application value.

An improved bolt and bolt carrier with integral gas key having an extension nozzle threadedly secured and pinned to the gas key for use with a direct gas operated firearm is provided. The extension nozzle is designed to receive a portion of the host firearms gas operating system. The firing pin retaining pin is oriented so as to expose its widest profile to the firing pins annular flange, increasing its service life. The bolt has a plurality of lugs extending from its forward end and an extractor recess. The extractor recess is constructed to accommodate an enlarged extractor claw while not undercutting the bolt lugs adjacent thereto. The extractor engages approximately 57% more of a seated ammunition cartridges rim as compared to some prior art AR15/M16 type extractors used with automatic firearms chambered in 6.8 SPC. The result is an improved bolt and bolt carrier which provides for increased operational reliability.

A semiconductor memory device includes a cell array region formed on a substrate, a word line contact region, and a page buffer region coupled to the cell array region through bit lines, wherein at least one of the bit lines has a curved structure toward the word line contact region. According to an embodiment, a misalignment between a cell plug and a contact plug caused by a natural cell plug bending phenomenon may be reduced to improve operational reliability of a semiconductor memory device.

The system of safe torque monitor for mixed power automobile is one four layer structure including one functional layer for completing various controls, one limiting layer for limiting the extreme values of functional layer signals, a redundant monitoring layer for detecting the functional layer signals and one physical detection layer for detecting the normal operation of the memory areas and the program flows. The present invention can control the output torque of the mixed power automobile and monitor the operation state of the power units to raise the safety and reliability of the mixed power automobile. The present invention also discloses one kind of safe torque monitoring system for mixed power automobile, and the system includes an engine controller module, a multiple power source controller module, a motor controller module, etc and can raise the reliability of mixed power automobile.

A method for manufacturing a lateral double diffused metal oxide semiconductor (LDMOS) device includes forming an oxide layer on a semiconductor substrate, forming first and second trenches by partially etching the oxide layer and the semiconductor substrate, forming a small trench overlapping with the second trench so that the second trench has a stepped structure, and depositing one or more dielectric layers so that the first trench forms a device isolation layer defining a semiconductor device region and the second trench having a stepped structure forms a drain extension device isolation layer. The breakdown voltage of the LDMOS device may be improved while reducing the on-resistance, thereby improving the operational reliability of the device.

The invention discloses a method for predicting the remaining driving mileage of an electric automobile. The method includes the steps that information of an input destination of a driver is acquired; information of the electric automobile is acquired; information of a real world is acquired; historical driving behaviors are loaded; according to the information of the input destination of the driver, the information of the electric automobile, the information of the real world and the historical driving behaviors, the optimal path and the remaining driving mileage of the electric automobile and the remaining electric quantity, generated when the electric automobile reaches the destination, of the electric automobile are obtained through calculation. The invention further discloses a system for predicting the remaining driving mileage of the electric automobile. The system comprises a unit for acquiring the information of the input destination of the driver, a unit for acquiring the information of the real world, a unit for acquiring the information of the electric automobile, a cloud server and a display unit. The method and system for predicting the remaining driving mileage of the electric automobile guarantee that a user can reasonably judge the remaining driving mileage of the electric automobile when driving the electric automobile, and the running performance and the running reliability of the electric automobile are greatly improved.

The invention provides a method for injecting a harmonic voltage to restrain a harmonic current of a PMSM (permanent magnet synchronous motor), which is characterized in that a ring to restrain the harmonic current is added to realize the closed-loop control for the harmonic current on the basis of extracting harmonic current components in the PMSM in real time, thus calculating to obtain harmonic voltage components which are required to be injected to restrain 5-order and 7-order harmonic currents of the PMSM; and then the obtained harmonic voltage components are injected into a three-phase control voltage in a speed control system of the PMSM so as to offset the 5-order and 7-order harmonic components in a motor current when the PMSM runs, thereby reaching the purpose of restraining the 5-order and 7-order harmonic currents. The method is used to solve the technical difficulty that current ZCP (zero crossing point) is required to detect accurately in a traditional mode to restrain the harmonic current, remarkably improves the current waveform of the motor, effectively restrains the 5-order and 7-order harmonic currents caused by the nonlinear characteristics of an inverter and the air-gap field distortion of the motor, effectively reduces the additional loss caused by the 5-order and 7-order harmonic current components, reduces the electromagnetic torque and the revolving speed pulse of the PMSM and improves the running efficiency and the running reliability of the PMSM.

The present invention discloses a ground fault detection system and method for an inverter. The ground fault detection method for the inverter includes a reference value setting step for setting a reference value for estimating a ground fault current and a reference value for deciding a ground fault, a ground fault current estimation step for comparing a current value obtained by adding up current values flowing through each phase of an output terminal of the inverter with the reference value for estimating the ground fault current, and estimating generation of the ground fault current when the calculated current value is larger than the reference value, and a ground fault phase decision step for deciding the phase in which the ground fault has been generated on the basis of a current difference value between start and end points of 0 vector sections of each phase or between start and end points of 7 vector sections of each phase. Therefore, even if the ground fault occurs in an output line during the load operation or a power frequency of the inverter is similar to an output frequency, the ground fault detection system and method for the inverter detect the ground fault to improve operational reliability of the inverter.

Disclosed is a method for modeling a medium and long term wind power output model optimally operating in a medium and long term in a power system. By calculating the wind power output of the power system during daily peak time period, daily valley time period, and daily shoulder load time period, and optimizing wind power output data during the daily shoulder load time period, the capacity substitute benefit of wind power generation is rationally taken into account, the operation reliability level of the power system is guaranteed, the bidirectional peak regulation characteristic of wind power output is considered, the peak regulation balance of the power system is guaranteed, the benefits of energy conservation and emission reduction of wind power resources are fully exerted, the highest utilization rate of the wind power generation capacity is guaranteed, the feature of low wind power schedulability is fully taken into account, the randomness and volatility of wind power output are correctly simulated, the practical situation of a simulation project optimally operating in a medium and long term in the power system is met, and the purpose of better calculating the randomness, the volatility, the regionalism and bidirectional peak regulation performance of wind power generation and a correlation between same and loads is achieved.

A wireless sensor network gateway unit is proposed, which is designed for integration to a wireless sensor network (WSN) for providing a gateway function with a failed link auto-redirecting capability for the wireless sensor network. The proposed WSN gateway unit is characterized by the provision of an failed link auto-redirecting capability, which can respond to the failure of any sensor node in the WSN system by performing a failed link auto-redirecting operation for redirecting the down-linked good sensor nodes for linking to a nearby good sensor node to thereby allow the down-linked good sensor nodes to be nevertheless able to transfer data to the WSN gateway unit of the invention. This feature allows the WSN gateway unit of the invention to maintain good operational reliability for the WSN system.

The invention discloses an intelligent door control system of a rail train, which comprises control modules, driving modules and a monitoring and diagnosing module, wherein each carriage is controlled by a control module, a driving module is arranged on each door, and in each carriage, the control module and the driving modules are communicated by adopting a CAN (controller area network) bus so as to realize a control mode where one control module corresponds to multiple driving modules. The control modules are connected with a train bus. The operation processes are as follows: the control modules receive control signals such as door opening, door closing and the like transmitted on the train bus, send TCMS (train control and monitor system) communication commands to the driving module on each door by the CAN bus or in other communication manners according to the obtained control signals so as to control opening and closing actions of the doors by electric motors, and carry out collection and tentative diagnosis on real-time monitoring data of the driving modules on the electric motors. The intelligent door control system can carry out real-time monitoring and diagnosis on running states of the control modules, the driving modules and the electric motors, so as to estimate safety degree of a door system and improve running reliability of a train.

The invention provides an air-cooling chilled and hot water air conditioning unit, and a defrosting control method and device therefor and aims to solve the problem that mistaken defrosting easily occurs to the prior defrosting control method. The control method includes: detecting defrosting detection data of the air-cooling chilled and hot water air conditioning unit during heating; judging whether the defrosting detection data meet all preset defrosting conditions or not; allowing a control unit to enter a defrosting mode when the defrosting detection data during heating meets all preset defrosting conditions. According to the control method described in the technical scheme, series of defrosting detection data such as compressor, air pressure and outgoing water temperature when the air-cooling chilled and hot water air conditioning unit heats are detected; the preset defrosting conditions are reasonably set; when the defrosting detection data meets the preset defrosting conditions, the control unit enters the defrosting mode; accordingly, mistaken defrosting is avoided and operational reliability of the air conditioning unit during defrosting can be improved.

The invention provides a driving control circuit and an over-current protection method of a GOA circuit thereof. The method comprises the steps of isolating or closing the GOA circuit; receiving at least one current signal from a control panel; comparing the current signal with a preset short circuit current threshold value; selecting the operation mode of the GOA circuit according to the comparison result; if the current signal is less than the short circuit current threshold, opening the GOA circuit to enter a normal working mode; if the current signal is more than or equal to the short circuit current threshold, keeping the GOA circuit closed to enter an over-current protecting mode. Compared with the prior art, the method has the advantages that the GOA circuit can be delayed to open or close, so that the short circuit protection mechanism can independently determine whether each current signal of the control plate exceeds the short circuit current threshold, the mistaken touch protection action caused by different current due to different plane display mode/ three-dimensional display mode and different temperature can be avoided, and as a result, the operation reliability of the GOA circuit can be improved.

The invention discloses a digital radiography-based breaker operating characteristic on-line detection device and method. The device comprises a gage mark, an image acquisition device and a computer, wherein the gage mark is arranged on a breaker drive mechanism; the image acquisition device is arranged in a place corresponding to the gage mark on the breaker drive mechanism; and the signal input end of the computer is connected with the image output end of the image acquisition device. The device of the invention uses a high speed camera to shoot the motion process of the breaker drive mechanism and obtain a motion image and inputs the motion image in the computer; and the computer analyzes and processes the image to obtain the motion (travel time) curve of the gage mark and performs analysis according to the obtained motion curve to obtain the motion characteristic parameter of the breaker to be detected. The device and method of the invention can be used to realize the on-line detection of the motion characteristic of the breaker, lay a foundation for handling the operational state of the breaker and grasping the motion characteristic, play an important role in the improvement of the operational reliability and provide support for the reliable operation of the electric system.

The invention discloses a wind-generator blade defect damage inspection method and an inspection system based on an unmanned helicopter. According to the method and the system, acquisition apparatuses for light, heat and sound signals are arranged on a small-size unmanned helicopter, the unmanned helicopter is controlled to approach a blade on a wind turbine tower in a wind farm for acquiring the light, heat and sound signals of the blade and recording or sending back the signals, so that a ground worker can analyze the blade state and timely discover blade damages and defects and adopts corresponding measures, and thus the operation reliability of blades is improved, and major accidents such as fracture and falling off of a blade and the like are prevented from generating. The inspection system comprises the small-size unmanned helicopter, a controller, a minitype visible-light image gatherer, a minitype thermal infrared imager, a sound sensor, a distance sensor, a signal emission device and a signal reception and processing device. The inspection system is capable of acquiring the light, heat and sound signals of blades in a close range, is accurate and reliable in information, convenient to operate and short in inspection time.

Provided are power device packages, which include thermal electric modules using the Peltier effect and thus can improve operational reliability by rapidly dissipating heat generated during operation to the outside, and methods of fabricating the same. An exemplary power device package includes: a thermal electric module having a first surface and a second surface opposite each other, and a plurality of n-type impurity elements and a plurality of p-type impurity elements alternately and electrically connected to each other in series; a lead frame attached to the first surface of the thermal electric module by an adhesive member; at least one power semiconductor chip and at least one control semiconductor chip, each chip being mounted on and electrically connected to the lead frame; and a sealing member sealing the thermal electric module, the chips, and at least a portion of the lead frame, but exposing the second surface of the module.

Exhaust gas amitted from a diesel engine flows through a ceramic soot filter in which particles contained in the exhaust are deposited and oxidized to regenerate the filter. The filter is regenerated by non-thermal, electric surface creeping discharge on filter surfaces covered with particles. In addition, nitrogen oxides may be reduced by selective catalytic reduction. The system is designed to ensure operation reliability and environmental compatibility.

The invention discloses a motor train unit line-side circuit and a control method thereof. The motor train unit line-side circuit comprises two motive power units in the same structure, wherein the two motive power units are connected through an isolation switch branch circuit, the isolation switch branch circuit is formed by serially connecting two isolation switches, and both ends of the isolation switch branch circuit are respectively connected to a position between a primary side current transformer and a vacuum circuit breaker of the two motive power units. The line-side circuit is a basically symmetrical circuit, the circuit type is simple, the equipment arrangement and the wire distribution are simple, the circuit control is easy to realize, and in addition, the train operation reliability is very high.