33results about How to "Realize closed-loop regulation" patented technology

The invention discloses a mould-assembling mechanism for an injection molding machine and a balancing and adjusting method for a mould-assembling force thereof. The mould-assembling mechanism comprises a rear mould plate (1), a moveable mould plate (2), a front mould plate (3), a toggle rod mechanism (4), four pull rods (5) and a pull rod adjusting mechanism, wherein the pull rod adjusting mechanism comprises strain foils (6), servo motors (7) and front nuts (8) which are one-to-one corresponding to the four pull rods (5); the positions and directions of the strain foils (6) on the four pull rods (5) are consistent; the peripheral surfaces of the front nuts (8) are gear-shaped; driving gears (9) are connected with the servo motors (7); and the driving gears (9) are engaged with the peripheral surfaces of the front nuts (8). The uniform stress of the four pull rods is realized by adopting a closed-loop feedback control balancing and adjusting method, so that the function of balancing and adjusting the mould-assembling force is achieved, the reliability of the mould-assembling mechanism is high and the service life is long.

The invention belongs to the technical field of motor drive control, and specifically relates to a dual-motor cooperative control system and method. The system comprises a first motor, a first motor sensor, a second motor, a second motor sensor and a controller, wherein the controller comprises a main control chip, a power supply module, a first power module and a second power module; and the main control chip receives signals of the first motor sensor and the second motor sensor and current feedback signals of the first motor and the second motor, and respectively obtains multi-phase PWM signals for driving the first motor and the second motor through a control algorithm, and the first power module and the second power module generate corresponding multi-phase voltage signals to respectively drive the first motor and the second motor after receiving the multi-phase PWM signals. The control method comprises the following steps: respectively performing closed-loop control on the current of the two motors, and performing closed-loop control on the position difference and/or displacement difference and/or speed difference between the two motors. The dual-motor cooperative control system and method disclosed by the invention have the advantages of high cost performance, simple system structure and high control precision.

The invention provides a relaxation oscillator with average voltage feedback, comprising a two-capacitance relaxation oscillator unit and an average voltage generating circuit unit, wherein the two-capacitance relaxation oscillator unit comprises two current sources which are symmetrical with each other, two comparators, two charging and discharging capacitors, two transmission gates, two phase inverters and an S-R latch. The relaxation oscillator with average voltage feedback of the invention can be used for generating an adjustable threshold voltage for controlling overturn of a comparator by introducing a circuit of the average voltage feedback. When delay time of the comparator is added, the average value of a sawtooth voltage on the charging and discharging capacitor is added too. An average voltage generating circuit is used for adjusting the threshold voltage for overturning the comparator to reduce so that the comparator can be overturned in advance to hold the period of the oscillator not to be changed basically. Through this manner, the relaxation oscillator with average voltage feedback of the invention reduces the requirement of output frequency accuracy in a traditional relaxation oscillator to a response speed of the comparator and realizes closed-loop regulation to the output frequency of the oscillator with a comparator circuit with simple structure and the average voltage generating circuit.

The invention relates to a method for regulating terminal voltage by reactive power support of a double-fed wind generator unit and a system thereof. The method includes steps of initializing the system, measuring terminal voltage and calculating errors e, judging whether the errors e is in a dead zone or not and calculating reactive power reference QPI, calculating the maximum reactive power capacity Qmax, defining reactive power control commands Qout according to the QPI and Qmax, and driving the double-fed wind generator unit to send out corresponding reactive power according to the reactive power control commands Qout. The system comprises an electric energy mass module, a dead zone hysteresis comparator, a PI (proportional plus integral) controller, a reactive power capacitor calculation module, a current converter and the double-fed wind generator unit. The decoupling control characteristics of active power and reactive power of the double-fed wind generator unit are given full play, dynamic regulation of voltage of the double-fed wind generator unit is realized, and the quality of the power grid is improved. Meanwhile, capacity of an SVC (static var compensator) and an SVG (static var generator) of existing reactive regulating equipment are decreased and cost is reduced.

The invention discloses a control method, device and system for a wind power plant to participate in rapid frequency modulation and voltage regulation of a power grid. The method comprises the steps:obtaining the real-time voltage and current data of a grid-connected point of the wind power plant, and calculating the operation states of the grid-connected point, including frequency, active power,reactive power and power factors; judging whether the voltage and the frequency of the current grid-connected point exceed an regulation dead zone or not according to the grid-connected point operation state; in response to the fact that the voltage and the frequency of the current grid-connected point exceed the regulation dead zone, executing operation: calculating active and reactive regulation data of the wind power plant according to the real-time voltage and current data and the operation state of the wind power plant grid-connected point based on a preset active regulation rule and a reactive regulation rule; and controlling the wind power plant to perform power regulation according to the calculated active and reactive regulation data of the wind power plant. Active and reactive output can be rapidly regulated according to frequency and voltage changes of the grid-connected points of the wind power plant, and frequency and voltage support is carried out on the power grid.

The invention relates to an electronic scale with a horizontal adjusting function. The electronic scale comprises a main body and a platform, and further comprises an adjusting mechanism and an energy-saving mechanism; the adjusting mechanism comprises an air inflation module and at least two adjusting modules; the air inflation module comprises a driving unit, a first cylinder, a piston, an air outlet and a first spring; the energy-saving mechanism comprises a generator, a first gear, a second gear, a transmission shaft, two pushing modules, two connecting rods, two connecting sleeves and twothird gears. In the electronic scale with the horizontal adjusting function, the independent control on the lifting of each of four corners of the electronic scale can be realized through the adjusting mechanism, thereby realizing automatic adjustment on a horizontal state of the electronic scale, and improving the accuracy of weighing an object by the electronic scale. Not only that, the mechanical energy for platform lifting can be converted into the electric energy through the energy-saving mechanism, and then the electric energy is supplied to the electronic scale for use, thereby prolonging the cruise duration of the electronic scale, and improving the practicability of the electronic scale.

The invention discloses a motor rotating speed adjusting circuit and device. The motor rotating speed adjusting circuit is connected with a motor, and comprises a control module, a digital-to-analog conversion module, a voltage stabilization module, a rotating speed detection module and a voltage sampling module, wherein the voltage stabilization module outputs a driving voltage to drive the motorto rotate according to the output voltage of the digital-to-analog conversion module; the rotating speed detection module is used for converting a current pulse signal generated by the motor into a standard pulse signal and outputting the standard pulse signal to the control module; the voltage sampling module is used for sampling the driving voltage and outputting the sampling voltage to the control module; and the control module calculates and obtains the current rotating speed of the motor according to the standard pulse signal, and adjusts the output voltage of the digital-to-analog conversion module according to the current rotating speed, the preset rotating speed and the sampling voltage so as to further adjust the rotating speed of the motor, so that the real-time measurement andadjustment of the rotating speed of the motor and the closed-loop adjustment of the rotating speed of the motor are realized, and the accuracy in adjusting the rotating speed of the motor is ensured.

The invention provides a fuel cell system, belongs to the technical field of fuel cells, and solves the problems that a humidifier and an electric pile cannot be effectively purged and mechanical damage of a membrane cannot be caused in the prior art. The system comprises an electric pile, an air compressor, a water pump, a heater, a radiator, a humidifier, a three-way valve I and a controller, wherein the air inlet of the electric pile is connected with the air compressor through the humidifier, a cooling liquid inlet is connected with the output end of the three-way valve I, a cooling liquid outlet is connected with the inlet of the water pump, and the outlet of the water pump is connected with the first input end of the three-way valve I through the heater and connected with the second input end of first three-way valve I through the radiator. According to the invention, after a shutdown instruction is received, a controller controls a cooling liquid to be heated through small circulation until the water temperature of a cooling liquid inlet of an electric pile rises to a threshold value, and a heater is turned off; an air compressor is controlled to perform hot purging on the electric pile and a humidifier; and after purging is finished, the cooling liquid is controlled to carry out large circulation for heat dissipation until the water temperature of the cooling liquid inlet is reduced to a set value, and the fuel cell system is closed.

The invention relates to a real-time energy efficiency optimization method for a combustion gas turbine. The method comprises the following steps of S1, according to detailed information and historical index parameters of the combustion gas turbine, establishing a high-precision combustion gas turbine simulation model; S2, by taking real-time index parameters of the combustion gas turbine as inputs of the combustion gas turbine simulation model, initializing a working condition, performing simulation operation based on the working condition, and recording an output result of the combustion gas turbine simulation model; S3, based on the output result of the combustion gas turbine simulation model, performing energy loss analysis, introducing a sensitivity analysis method to search for a method capable of effectively reducing the energy loss so as to determine optimal index parameters; and S4, performing verification by taking the optimal index parameters as the inputs of the combustion gas turbine simulation model.

The invention belongs to the technical field of lamp operation, and specifically relates to a lamp control system. The system is characterized in that the system comprises a hand ring which is used for detecting and processing swinging information data of a human arm and the surrounding light intensity data, a control terminal for receiving an operation instruction of the hand ring, and a lamp. The control terminal controls a lamp tool through a drive module. The hand ring is provided with a light sensor which is used for detecting light intensity, an accelerometer for detecting the swinging information of the human arm, a touch control key for operating the hand ring so as to control the lamp through the control terminal, a hand ring main control chip for processing the data, a gesture recognition module which is used for recognizing the gesture of the human arm, and a wireless transmitting module which is used for transmitting data. The control terminal is provided with a wireless receiving module which is used for receiving the hand ring operation instruction, and a control end main control chip for data processing. The system achieves the movement of a switch, also achieves the closed-loop regulation and control of light, and enables a person to be in a more comfortable light environment.

The invention relates to a signal isolating method in the field of industry used automatic gadget electric signal transmission technology, which comprises the following steps: the 24V dc power generates two groups of isolating voltage signal after the oscillating of the push-pull circuit, one group provides the power to the front stage computing amplifier and the other group provides the power to the rear stage computing amplifier. It uses the magnetic ring coil to isolate the front stage computing amplifier and the rear stage computing amplifier. The 4-20mA current signal inputted by the inputting end generates the voltage signal by the sampling resistance and transmits the obtained voltage signal to the front stage computing amplifier then to the isolating coil. The isolated coil generates 4-20mA current which generates the voltage signal by the sampling resistance and transmits the obtained voltage signal to the rear stage computing amplifier to generate standard constant-current source signal and then outputs it.

The invention relates to the field of high-power switching power supply, and in particular to a parallel high-power switching power supply. The parallel high-power switching power supply comprises a system control unit, more than one parallel power unit and a system feedback unit, wherein the input end of the system feedback unit is connected with master output loops of the parallel power units; the output end of the system feedback unit is connected with the input end of the system control unit; the output end of the system control unit is connected with control ends of the power units. According to the parallel high-power switching power supply, various power unit setting modes are combination of analogue setting and communication setting; the reliability of the power supply is improved; meanwhile, the parallel high-power switching power supply comprises the system feedback unit; and overall closed-loop adjustment of the system is achieved by three feedback units such as current divider feedback, hall feedback and inner feedback current superposition.

The invention discloses a fast charging device for a storage battery system so that an alternating-current power supply and a storage battery pack are connected by the fast charging device and thus the rapid charging of the battery pack can be realized. An active filter, an alternating-current contactor and a three-phase rectifier bridge are connected based on phases successively; an input inductor and the input capacitor are connected in series and then are connected to positive and negative terminals of the output terminal of the three-phase rectifier bridge; the input terminal of an alternating-current conversion module is connected to the two ends of the input capacitor; and the output terminal of the alternating-current conversion module is connected to the input terminal of an isolation transformer. A high voltage direct-current relay, an output capacitor and a battery pack are connected in series; one end of the output capacitor is connected to the cathode of a diode rectifier bridge through an output inductor and the other end is connected with the anode of the diode rectifier bridge; and the output terminal of the diode rectifier bridge is connected to the output terminalof the isolation transformer. Therefore, charging efficiency of the battery is improved and the safety of the storage battery during the charging and discharging processes is enhanced.

The invention relates to the technical field of steel plate after-rolling controlled cooling and discloses a pressure stabilizing and water supplying device for a thick plate after-rolling cooling system high-pressure section and a method thereof. The pressure stabilizing and water supplying device is arranged at an inlet of a middle water collecting pipe of a cooling system. A pressure sensor isarranged in the portion, located at the inlet of the middle water collecting pipe, of a water supply pipe of the pressure stabilizing and water supplying device. One or more water return branch pipesare installed on the water supplying pipe. An electric adjusting valve is arranged in each water return branch pipe. The water return branch pipes communicate with a water return main pipe up to a water supply pool. The water supply pool is provided with a variable frequency water supply pump which is connected with the water supplying pipe. The pressure sensor is arranged on the connecting portion of the variable frequency water supply pump and the water supplying pipe. The rotating speed of the variable frequency water supply pump and the opening degree of the electric adjusting valve are adjusted according to the numerical value of the pressure sensor, closed-loop control of water supply is achieved, the effect of stabilizing water supply pressure is achieved, and the amplitude of watersupply pressure fluctuations of the after-rolling cooling system high-pressure section is reduced remarkably.

The invention discloses an electric control system for water supply with constant pressure and frequency conversion. The system comprises a water inlet pipe, an electromagnetic valve, a filter screen, a buffer water tank, a communicating water pipe, a one-way electromagnetic valve, a water supply tank, a drain pipe, a pressure stabilizing compensator, a first water supply pipe, a second water supply pipe, a remote pressure gauge, a butterfly valve, a motor controller, a water pump, a water outlet pipe, a circuit protecting device, a programmable controller, a frequency converter and a connecting pipe. The system disclosed by the invention has the beneficial effects that circulating soft start is conducted on the water pump by means of the frequency converter, so that the stability of the equipment which is started is guaranteed, the service life of equipment elements is prolonged, and electrical failures such as overload, under voltage, short circuit and phase sequence of the whole electric control system can be monitored; multiple protection and targeted protection are performed on the electric control system, so that the electric control system is safer and more reliable; and the programmable controller outputs a standard signal to control the output frequency of the frequency converter, so that the rotating speed of the motor of the variable frequency water pump is automatically adjusted to realize closed loop adjustment of the water pressure of a pipe network.

The invention provides a rapid active power control method and system for a wind power plant. The method comprises the steps of adjusting the active output of a wind turbine generator through a wind power plant AGC system and an energy management platform according to a power grid dispatching instruction and the in-station measurement information of the wind power plant, and achieving the active control of a grid-connected point of the wind power plant so as to meet the grid-connected requirements of the power plant. The system collects in-station measurement information of the wind power plant, especially voltage and current information of the grid-connected point, and calculates real-time active power of the grid-connected point. A difference value is obtained between a power grid dispatching given active power value and actually measured active power, and then the difference value is superposed on the power grid dispatching instruction and is output to the wind power plant AGC system and the energy management platform, so that closed-loop regulation of the active power of the grid-connected point is realized, and the purpose of quickly and accurately regulating the active power of the wind power plant is achieved. The system avoids the defects of large manual adjustment error, slow response and the like of the wind power plant, and can automatically compensate the network loss of the wind power plant, so that the active power of the grid-connected point automatically follows the scheduling instruction.

The invention discloses a wireless charging control method and a wireless charging transmitter used for solving the problem that a conventional control process is complex. The method includes the following steps: obtaining an actual power parameter output by a wireless charging receiver and a target output power parameter of the wireless charging receiver; determining an adjustment parameter of anetwork unit in the wireless charging transmitter according to the actual power parameter and the target output power parameter; and adjusting an output power parameter of the network unit according to the adjustment parameter.

The invention provides an engine thermal management system and method.The system comprises a thermal management valve and an electric control bypass valve, the thermal management valve is connected with a first exhaust manifold of an engine, and the electric control bypass valve is connected with a second exhaust manifold of the engine; the thermal management system further comprises an exhaust back pressure valve, and the exhaust back pressure valve is connected with the vortex end. Combustion waste gas of the engine is used for providing energy for the gas compressor through acting of a turbine of the turbocharger; and in combination with a fed-back turbine front pressure signal, closed-loop regulation of turbine efficiency is realized through combined regulation and control of a designed thermal management valve, an electric control bypass valve and an exhaust back pressure valve. Control and closed-loop adjustment of the efficiency of the turbocharger of the engine have great effects on improvement of the utilization efficiency of exhaust energy and improvement of fuel economy.

The invention relates to the technical field of livestock breeding, in particular to a novel energy-saving and environment-friendly deodorization device special for a breeding house, which comprises the breeding house, a fan for discharging harmful gas and suspended matters in the breeding house is arranged on the breeding house, a closed chamber is arranged on one side of the breeding house, and an air outlet of the fan is arranged in the closed chamber; wherein a deodorization wall is arranged on one side of the closed chamber, the deodorization wall is formed by combining a plurality of deodorization boxes, a water curtain spraying system is further arranged on the deodorization wall, a water return groove is formed in the bottom of the deodorization wall, and a water return treatment device is arranged at one end of the deodorization wall. The device serves as important equipment for deodorization and filtration, is simple in structure, has the characteristics of intelligent control, low-energy-consumption operation and remarkable deodorization and filtration effects, and achieves the goals of energy conservation, emission reduction, green cultivation and low-carbon cultivation.