33results about How to "Efficient and reliable control" patented technology

The invention relates to the technical field of power electronic current transformers, and provides a resonance-type power electronic current transformer and a current transformer device. The current transformer comprises an input-stage rectifying circuit and a rear-stage DC/DC circuit. The input-stage rectifying circuit comprises three bridge arms. Each bridge arm is composed of an upper half bridge arm body and a lower half bridge arm body. The midpoints of the bridge arms are connected with three phases of a high-voltage alternating-current power grid respectively. Each half bridge arm body comprises n module units. Ports of the module units are connected in a head-to-tail mode to form a bridge arm structure. Due to the high-frequency isolation of the input side and the output side, a heavy lower-frequency transformer is removed, and meanwhile efficient energy transmission and intelligent control are achieved. Harmonic wave transmission between different power grids and mutual influences caused by failures of the different power grids can be intercepted, meanwhile, the range of the output voltage is wide, continuous adjustment of the current and the voltage can be achieved, system operation information of the current transformer is easy and convenient to collect, mutual communication can be achieved among a plurality of current transformer systems, and the intelligent power grid is obtained.

The invention discloses a frost-less air-source heat pump hot water unit and a proportional-integral-differential control method for the same. The proportional-integral-differential control method includes performing computation according to received air temperature and humidity parameters, received air pressure parameters and received surface temperature parameters of an evaporator when outdoor temperature parameters which are transmitted by a temperature and humidity sensor and are received by a computation controller are lower than 0 DEG C, controlling the opening of an electronic expansion valve according to a computation result and regulating the surface temperature of the evaporator by means of increasing or reducing the opening of the electronic expansion valve so that the surface temperature of the evaporator is constantly higher than a frost formation point; and enabling a silicon-controlled power regulator to judge a suction superheat degree of a compressor according to received suction temperature and suction pressure of the compressor, increasing or reducing the power of an electric heater and maintaining that the suction superheat degree of the compressor only varies within a set value range. The frost-less air-source heat pump hot water unit and the proportional-integral-differential control method have the advantage that adjustment for the opening of the electronic expansion valve is matched with adjustment for the power of the electronic heater, so that the purpose of maintaining safe and efficient running of a system is achieved.

The invention belongs to the field of material genetic engineering, multi-scale simulation and material big data, and relates to a multi-scale integrated visual high-flux automatic calculation processand data intelligent system, which comprises a material modeling system, a scientific calculation system, a server configuration system, a data storage system, a data analysis system and an artificial intelligence system. According to the method, an automatic construction method of a material complex model, various material calculation simulation methods with different scales, various types of material databases, a material performance analysis technology and a data mining technology based on artificial intelligence are combined, and 1000-magnitude material high-flux calculation simulation can be automatically carried out; material calculation simulation of multiple scales such as an electronic scale, an atomic scale, a molecular scale and a mesoscopic scale can be carried out, and errorspossibly occurring in the calculation process can be automatically corrected; all calculated structural data, intermediate metadata and result data can be stored in various types of material databases, so that a user can conveniently inquire and carry out data mining analysis.

A highly reliable control device for an AC generator without using a transistor and diode having high withstand voltage is provided.

A control device for a vehicle AC generator including a voltage control circuit that controls an output voltage of a rectifying circuit connected to a stator coil to a substantially constant level has a first active switch having its one end connected to one end of the field coil and having its other end connected a negative output terminal of the rectifying circuit, a second active switch having its one end connected to a positive output terminal of the rectifying circuit and having its other end connected to the other end of the field coil, a first passive switch connected between the negative output terminal of the rectifying circuit and a connecting point of the second active switch and the field coil, and a second passive switch connected between the positive output terminal of the rectifying circuit and a connecting point of the first active switch and the field coil, and the first and second active switches are on/off-controlled independently of each other.

The invention provides a DC microgrid branch linkage control system and method. The DC micro-grid branch linkage control system comprises a detection unit for performing real-time voltage detection and current detection on each branch connected to a DC micro-grid bus; a controller which is used for carrying out frequency analysis and threshold analysis on the detected voltage and current, judgingfaults occurring in the direct-current microgrid on the basis of the frequency analysis and the threshold analysis, and carrying out linkage control on a plurality of branches on the basis of the faults; and a branch linkage mechanism which is used for executing linkage protection on branches in the system under the control of the controller.

Reach truck 1 with a control system 2 for controlling the lowering movement of a fork 10, the control system 2 comprising a height sensor 20, for determining the lifting height h of the fork 10 of the reach truck 1, a proportional electrical hydraulic valve 50 connected to a lifting cylinder 70 of the reach truck 1, for controlling an oil flow of the lifting cylinder 70, and a control unit 30, connected to the height sensor 20 for receiving the actual lifting height h signal and controlling the proportional electrical hydraulic valve 50, wherein the control unit 30 automatically decreases the maximum lowering speed v of the fork 10, by controlling the proportional electrical hydraulic valve 50, according a predetermined maximum speed v curve depending on the lifting height h of the fork 10, and in some embodiments only on the lifting height h of the fork 10, such that the fork 10 is softly stopped at the ground.

The invention relates to a six-way valve which comprises a valve body and a valve element arranged in a cavity of the valve body. Six branch pipelines are connected to the valve body, and each branchpipeline is communicated with the cavity in the valve body; the valve body can rotate relative to the valve body, the valve element comprises two valve clacks which are arranged in a spaced mode, three independent cavities are defined by the two valve clacks and the valve body, and the valve element rotates relative to the valve body to switch communication of the different cavities and the branchpipelines. According to the six-way valve, switching among three passages formed by the six branch pipelines on the valve body and the three cavities on the valve element is achieved through rotationof the valve element in the valve body, the six-way valve is high in integration degree and simple in control logic, communication control over the six branch pipelines on the valve body is simplified, and control is efficient and reliable; and meanwhile, the six-way valve is small in overall size, light in weight and low in energy consumption required for correspondingly controlling switching ofthe passages on the six-way valve.

A method is provided to control a hybrid powertrain comprising an internal combustion engine; a gearbox with input and output shafts; a range gearbox connected to the output shaft; a first planetary gear, connected to the input shaft; a second planetary gear, connected to the first planetary gear; first and second electrical machines, respectivley connected to the first and second planetary gears; a gear pair connected with the first planetary gear and the output shaft; and a gear pair, connected with the second planetary gear and the output shaft, wherein the internal combustion engine is connected to the input shaft. The method comprises: a) engaging a gear by connecting two rotatable components in the first planetary gear; b) connecting the second or the fourth gear pair; c) connecting a sixth gear pair, arranged between a countershaft and the range gearbox to the countershaft, so that the countershaft is connected with the output shaft via the range gearbox; d) synchronising the rotational speed between two rotatable components in the range gearbox; e) connecting the rotatable components with a shiftable third clutch device; and f) engaging a gear by way of connecting two rotatable components in the second planetary gear.

An electromagnetic device for manipulating a magnetic-responsive robotic device, and an electromagnetic apparatus incorporate one or more such electromagnetic device. The electromagnetic device includes a magnetic core 200 having a first portion and a second portion extends from one side of the first portion. The first portion has a first cross section and defining a first central axis. The second portion has a second cross section smaller than the first cross section, and defines a second central axis parallel to the first central axis. A first electromagnetic coil is arranged around the first cylindrical portion. A second electromagnetic coil is arranged around the second cylindrical portion.

The invention belongs to the technical field of single pipe grabbing, and particularly relates to a single pipe grabbing control system in a profound hypothermia cold chain environment. The single pipe grabbing control system in the deep hypothermia cold chain environment is good in using effect. The single tube grabbing control system in the deep hypothermia cold chain environment comprises a processor circuit, a first stepping motor driving circuit, a second stepping motor driving circuit, a third stepping motor driving circuit, a heating control circuit, a temperature detection circuit and a power supply circuit. The control circuit is characterized in that a signal transmission port of the processor circuit is respectively connected with a signal transmission port of the first stepping motor driving circuit, a signal transmission port of the second stepping motor driving circuit, a signal transmission port of the third stepping motor driving circuit, a signal transmission port of the heating control circuit and a signal transmission port of the temperature detection circuit.

The invention provides a full-digital control system based on a safety type high-speed autonomous bus, a flattened system structure and the full-digital control system based on the safety type high-speed autonomous bus are adopted, so that the number of equipment and cables is greatly reduced, the staffing level is reduced, and the intelligent level and the reliability level of the system are improved; the integration and full-digital control of the control system of a submarine nuclear power device are achieved, and measurement, control, protection and operation management are efficiently and reliably conducted on the submarine nuclear power device. The dynamic automatic reconstruction of system functions and automatic starting and function recovery under the condition of failure of any control module are realized by adopting the acquisition control module based on rapid algorithm scheduling, and the reliability of the system is further improved. According to the invention, an auxiliary decision support function design based on big data mining and fault diagnosis is adopted, designs such as online fault diagnosis and auxiliary decision support are developed, and the intelligent level of the system is improved.

The invention provides an enciphered seam adjusting structure of a sewing machine and belongs to the technical field of clothing manufacturing equipment. The structure solves the technical problems that the enciphered seam adjusting structure of a prior sewing machine is not accurate enough and the like. The enciphered seam adjusting structure comprises a shell, a cloth feeding rack, cloth feedingteeth, a differential tooth rack and differential teeth, wherein the enciphered seam adjusting structure comprises a lower front shaft and a differential shaft which are connected with the differential tooth rack and the cloth feeding rack; the enciphered seam adjusting structure also comprises a driving motor arranged in the shell; an output shaft of the driving motor is connected with a connecting rod pin through a swinging rod assembly; the lower front shaft is connected with the connecting rod pin through an eccentric connecting rod; and the differential shaft is connected with the connecting rod pin through a connecting crank and a crank connecting rod. According to the invention, the number of the enciphered stitches and the distances between the enciphered stitches are accurately controlled through the driving motor, and manual adjustment of mechanical parts is not needed, so that the operation requirement of a user is greatly reduced; and moreover, the speed response is high,the adjustment is convenient, the control is efficient and reliable, and the automation degree is high.