302results about How to "Simple and reliable control process" patented technology

The invention discloses an electric scooter. The electric scooter comprises a motor base, a left motor wheel, a right motor wheel, a left pedal, a right pedal and circuit boards; the left motor wheel and the right motor wheel are installed on the left side and the right side of the motor base respectively, the left pedal and the right pedal are rotatably installed on the motor base and rotate front and back relative to the motor base, and the circuit boards are used for sensing the rotating angles of the corresponding pedals and controlling work of the corresponding motor wheels according to the rotating angles of the pedals. According to the electric scooter, only one motor base is supplied, the structure strength is high, the reliability is good, and the bearing strength can be effectively guaranteed; through the left pedal and the right pedal which are rotatably installed on the motor base, the circuit boards can control the work of the corresponding motor wheels according to the rotating directions and the rotating angles of the left pedal and the right pedal, advancing, retreating and turning are completely controlled through feet in the driving process of a driver, and the intentions and behaviors of people are highly combined and are approximately consistent with those of people in walking.

An electric vehicle driving motor controller with a charging function is characterized by comprising a three-phase bridge-type DC-AC bidirectional converter, a first relay switch, a second relay switch, an AC power supply input interface device, a driving motor, a voltage reduction transformer, a charging power battery and a central control microprocessor. The electric vehicle driving motor controller and the control method thereof have advantages of concise circuit structure, effective number reduction of electrical elements, higher operation reliability, low cost, small weight, small size and high power factor.

The invention discloses an unmanned aircraft rolling flattening control method based on sideslip correction method, which is characterized in that a intrinsical sideslip correction method is improved by introducing an aileron controlled variable of unmanned aircraft rolling flattening control time Delta x0, according to the formula, the unmanned aircraft is processed with rolling flattening control using Delta x=Krr+Kw number-[x]Omegax+ Delta xo. The invention is particularly suitable for the unmanned aircraft control which has high requirement to landing rolling flattening while the side wind is strong. The aileron controlled variable in rolling flattening accessing time is only needed to record applying the control method of the invention, and the flattening control can be realized; the control process is simple and reliable; the airplane can be grounded in smaller roll angle; in the same side wind situation, the unmanned aircraft can be landed in near zero degree by applying the control method in the invention, which can greatly increase the landing safety of unmanned aircraft.

The invention discloses an electronic commutation brushless direct current and single phase fan circuit and a control method thereof. The electronic commutation brushless direct current and single phase fan circuit comprises an alternating current rectifying circuit, a switching power supply, an inverting commutation circuit, rotor-position sensor, a current sampling circuit and a controller, wherein the switching power supply is used for supplying power to a motor and the switching power supply, the switching power supply is used for generating low-voltage power supply and supplying the low-voltage power supply to an external component, the inverting commutation circuit is used for controlling motor current alternation, the rotor-position sensor is used for supplying the position information of the current rotor, the current sampling circuit is used in winding current feedback, and the controller is used for fulfilling motor commutation and circuit regulation. The electronic commutation brushless direct current and single phase fan circuit and the control method thereof have the advantages that due to the fact electronic switch components are adopted, the motor is quiet and reliable in commutation processes without any mechanical movement. Due to the fact that permanent magnet rotors are adopted, the magnet winding of an ordinary direct current motor is not needed, and loss is reduced. In addition, the whole circuit and the control method of the circuit are simple and reliable, and the performance and reliability of a whole machine are improved.

The invention discloses a device and a method for the harmonic impedance measurement of a micro-grid. The device comprises a harmonic current source injection device, a harmonic voltage and harmonic current detection device, a data acquisition device and an upper computer, wherein the harmonic current source injection device is used for injecting harmonic current into the grid; the harmonic voltage and harmonic current detection circuit is used for detecting the magnetic harmonic voltage and harmonic current in the grid before and after the harmonic current is injected into the micro-grid; the data acquisition device is used for sampling a signal detected by the harmonic voltage and harmonic current detection circuit, and transmitting data to the upper computer; the upper computer is used for processing the sampled signal, calculating the variations of the harmonic voltage and the harmonic current, and calculating the harmonic impedance of each part of the micro-grid. According to device and the method, harmonic current of which the amplitude, frequency, phase and waveform can be controlled can be injected into the grid through the harmonic current source injection device, so that the harmonic impedance measurement accuracy of the grid is improved.

The invention provides a valve control type semi-active oscillating damper. The valve control type semi-active oscillating damper comprises an oil cylinder component and an extra-cylinder component which is positioned on the outer side of the oil cylinder component, wherein the oil cylinder component comprises a guide bearing, an oil cylinder and a bottom valve seat which are fixedly connected with one another in turn; an oil storage tank is arranged outside the oil cylinder, and a piston and a piston rod are arranged in the oil cylinder; the extra-cylinder component comprises a first switching valve, a second switching valve, a two-position three-way valve, a proportional overflow valve, a throttling valve, a throttling overflow valve, a body acceleration sensor and a controller; the body acceleration sensor is used for detecting the acceleration of a body, outputting a signal and transmitting the signal to the controller; and the controller is used for controlling the energization and de-energization states of the first switching valve, the second switching valve and the two-position three-way valve, and controlling the current intensity of the proportional overflow valve at the same time. The valve control type semi-active oscillating damper is simple in structure, can make real-time responses and provide a continuously adjustable damping force according to the state of a train during operation, and can be simply and reliably controlled.

The invention discloses a distributed water mixing and pressurized heat supply system having a decoupling function and a design method of the system, relate to a heat supply system and a design method thereof, and aims to solve the problems of high invalid energy consumption and mutual coupling of hydraulic regimes existing in the conventional directly-connected centralized heat supply system, the problems of mutual coupling of hydraulic regimes and poor system adaptability existing in a distributed pump system, the problems of mutual coupling of hydraulic regimes and the presence of invalid energy consumption existing in the conventional water mixing system, and the problems of high invalid energy consumption and large diameter of an equalizer tank existing in an equalizer tank system. The distributed water mixing and pressurized heat supply system comprises a heat source, a heat source circulating water pump set, a water supply pipeline, a water return pipeline and three types of heat users, wherein the inlets of a first type of heat supply network users are provided with water mixing pumps and differential pressure valves; the inlets of a second type of heat supply network users are provided with water mixing pumps, booster pumps and decoupling equipment; and the inlets of a third type of heat supply network users are provided with water mixing pumps. The distributed water mixing and pressurized heat supply system is applied to heat supply systems.

The invention relates to a method and an apparatus for performing an assay on chemical, biochemical, or biological fluids. The apparatus includes an assay chamber for fluid reactions and a centrifugal force activated-valve for controlling fluid movement through the assay chamber. An active surface can be positioned in the assay chamber to react with fluids passed through the assay chamber. The active surface may contain biomolecular probes. The biomolecular probes can be DNA, DNA fragments, RNA, RNA fragments, reagents, protein, protein fragments, lipids, and lipid fragments. The apparatus is particularly useful when multiple reactions, dilutions, or washing steps are required to determine a final answer. The centrifugal force activated-valve provides positive control over fluid in the assay chamber and allows for repeated use of the same chamber for multiple reaction steps. The apparatus can be disposed of after an assay to eliminate potential contamination from reuse of the same apparatus. Fluids passed through the assay chamber may be recovered for subsequent analysis, processing, or reactions.

The invention relates to a direct effect testing device for lightning current. The testing device comprises a lightning current first return stroke component loop, a lightning current middle current component loop, a lightning current continuous current component loop, a lightning current subsequent return stroke component loop, a time sequence trigger circuit, a direct effect discharge rack and the like. According to the device, effects of simulating a complete lightning current process in nature and checking combustion, corrosion, explosion, structural distortion, strength reduction and the like caused to a tested object by high-temperature and high-pressure shock wave and electromagnetic force accompanied during attachment of lightning arc can be simultaneously produced, and each component of the lightning current can also be produced respectively for independently checking single lightning current characteristics. The testing device fills the blank about similar devices in China, and superior equipment is provided for direct effect testing of the lightning current.

The invention relates to a device for waste heat recovery based on control over outlet smoke temperature. According to the device, a smoke adjusting baffle and a bypass flue are arranged in an original flue and a temperature sensor is arranged in the flue; the bypass flue is communicated with a smoke heat exchanger and the smoke heat exchanger is connected with a steam pocket; the steam pocket is communicated with an air heat exchanger in an air side flue through a saturated steam output pipe and the air heat exchanger is further communicated with the steam pocket through a condensate water input pipeline so that circulation can be formed; a condensate water circulation pump is arranged on the condensate water input pipeline; a liquid level sensor is arranged on the air heat exchanger; the steam pocket is provided with a steam pocket pressure sensor. The outlet smoke temperature is controlled by the adjusting baffle, smoke is shunted by the adjusting baffle, and therefore it is guaranteed that the temperature of the discharged smoke is stabilized at a set value; according to control over the steam pressure of the steam pocket, the backflow speed of condensate water is controlled to control the heat exchange area of a heat exchange system, and therefore control over the heat exchange power of the heat exchangers is achieved.

The invention discloses a preparation method of a black zirconia ceramic. The preparation method solves the problem that a black pigment of the existing black zirconia ceramic has poor high temperature performances so that performances of a black zirconia ceramic fished product are reduced. The preparation method comprises grinding the black pigment and zirconia powder as raw materials, mixing the powder, molding the mixed powder, and carrying out calcining to obtain the black zirconia ceramic. The black pigment is prepared from lanthanum oxide, calcium oxide, chromium oxide and alumina through grinding, mixing, calcining and crushing. A mole ratio of lanthanum oxide, calcium oxide, chromium oxide to alumina is (1-x): x: (1-y): y, wherein x is greater than 0 and less than or equal to 0.4 and y is greater than 0 and less than or equal to 0.5. The preparation method has the advantages of simple process, low production cost and environmental friendliness. The black zirconia ceramic has excellent performances such as high temperature performances.

The invention discloses a control method of a high-power electrolytic hydrogen production rectification power supply. The control method comprises the following steps of: acquiring a zero crossing point of a-phase power grid voltage ua by using a phase-locked circuit, calculating a power grid period in real time by a DSP control circuit according to the zero crossing point of the a-phase power grid voltage ua, and acquiring a power grid reference phase; respectively sampling an input current value of a three-phase LC filter, a direct current side output current value of a three-phase current source type PWM rectifier and a direct current side output current value of a multi-pulse thyristor rectifier by using a current Hall sensor; and employing the DSP control circuit to carry out control calculation according to the values, adopting a PI controller to control the output current of the multi-pulse thyristor rectifier, and adopting the PI controller and a repetitive controller to control the direct current side output current value of the three-phase current source type PWM rectifier. According to the control method, the output power is large, the hydrogen production efficiency is high, the output current can be flexibly adjusted in a large range, and the system is stable and reliable.