61results about How to "Meet the requirements of control accuracy" patented technology

The invention discloses a rotary steering tool controlling method which can be used for determining the control mode and steering parameters of a steering tool, achieving automatic control over a hole trajectory, improving the working efficiency of the steering tool, and meeting the requirement of directional drilling for steering control. The method comprises the steps of acquiring surveying data and monitoring the trajectory. By the adoption of the method, steerable drilling efficiency is improved, hole trajectory control precision is improved, and the requirement of extended-reach well drilling, complicated geology structure horizontal well drilling and geosteering drilling for trajectory control can be met.

The invention discloses a control method of a sight-stabilizing servo system based on ADRC and NLPID. Under the premise of meeting the control precision requirement of the sight-stabilizing servo system, through the design of applying an active disturbance rejection control algorithm to a speed loop controller of the servo control system, steady-state error of the sight-stabilizing servo system isreduced; and through the design of applying an improved non-linear PID control algorithm to a current loop controller, torque fluctuation of a DC torque motor can be suppressed effectively. The control method has obvious effect for improvement of tracking precision of the sight-stabilizing servo system and enhancement of disturbance isolation property, and meanwhile, the controller of the servo system has high adaptability and robustness.

The invention provides a combined type pressurizing double-electromagnetic-valve gas injection device which comprises a pressurizing part, a double-electromagnetic-valve part, a double-control-piston part, a double-needle-valve-nozzle part and an injection device body. The pressurizing part is located on the upper portion of the injection device body. The double-electromagnetic-valve part is located at the position, below the pressurizing part, in the injection device body. The double-control-piston part is located at the position, below the double-electromagnetic-valve part, in the injection device body. The double-needle-valve-nozzle part is located on the lower portion of the injection device body. The combined type pressurizing double-electromagnetic-valve gas injection device can be matched with an engine with a wide power range, and gas leakage and static control oil leakage are avoided. Two electromagnetic valves are adopted for controlling two nozzles to inject gas separately, the two nozzles share one pressurizing piston to achieve gas pressurization, and the gas injection process can be switched between a pressurizing mode and a non-pressurizing mode. The gas injection process and the gas pressurizing process are controlled separately, injection pressure can be adjusted, the injection law is flexible and changeable, and the needs for the power of the engine under different working conditions and the power of serialized engines are met.

The invention provides a combined type dual-electromagnetic-valve gas injection device which comprises a dual-electromagnetic-valve part, a dual-control-piston part, a dual-needle-valve nozzle part, an injection device upper end cover and an injection device shell. A high-pressure control oil inlet, two low-pressure oil drainage openings and a gas inlet are formed in the injection device shell. The dual-electromagnetic-valve part is composed of two electromagnetic valves, an electromagnetic valve body, an electromagnetic valve spring seat and an electromagnetic valve sealing base. The dual-control-piston part comprises a piston sleeve, a first piston, a first piston control cavity, a first needle valve control cavity, a second needle valve control cavity, a second piston and a second piston control cavity. The dual-needle-valve nozzle part is composed of a first needle valve, a second needle valve, a needle valve base, a nozzle sleeve, a first nozzle sealing ring belt and a second nozzle sealing ring belt. According to the combined type dual-electromagnetic-valve gas injection device, gas leakage and static leakage of control oil are avoided, the two electromagnetic valves are adopted for separately controlling two nozzles for gas injection, and the requirements for the power of engines under different working conditions and the power of series engines are met.

The present invention proposes a proportional valve, including a valve body and a valve core; inside the valve body there is an accommodating cavity, which is divided into several sections of single cavities from top to bottom; the upper part of each single cavity has an annular extension cavity; each The valve body on both sides of the middle part of the single chamber is symmetrically provided with an inlet and an outlet; the valve core includes a number of single cores stacked from top to bottom, and several single cores are fixed by string rods, and the top of the string rods is connected to The output shaft of the driving motor; the single core includes a working single core and a sealed single core; the single core has a cylindrical core, and the core is accommodated in a single cavity; the upper part of the core has an annular extension edge, which is accommodated In the extension cavity; the core body of the working single core is provided with a through flow channel, and when one end of the flow channel is aligned with the inlet, the other end of the flow channel is aligned with the outlet. The present invention can adjust the maximum flow rate of the proportional valve, can be applied to occasions requiring various flow rates, and can meet the requirements of flow control accuracy.

The invention discloses a photovoltaic active power distribution network scheduling control method based on f-dp / dv. The method comprises the following steps: (1) actively collecting actual active power Ppcc at a power distribution network port; (2) calculating the power difference delta P between the port reference active power and the actual active power Ppcc; (3) carrying out frequency recoverycontrol on each photovoltaic power supply, collecting the output port frequency f of each photovoltaic power supply, and calculating the corrected rated frequency; (4) carrying out proportional scheduling control on each photovoltaic power supply, collecting the voltage and current of photovoltaic output according to the power difference delta P from a dispatching center and a preset rated value,and calculating to obtain a corrected rated value, (5) carrying out droop control on each photovoltaic power supply, inputting obtained values, and calculating a reference value through a droop formula; and (6) allowing each photovoltaic power supply to control actual output according to the dp / dv reference value. According to the invention, the robustness of the AC microgrid system can be improved, and the reliable control of the grid-connected island operation and switching of the AC microgrid system is realized.

The invention belongs to the technical field of aircrafts, and discloses a helicopter flight driving robot system. The helicopter flight driving robot system comprises a fuselage hanging frame, a fuselage bottom plate, a servo mechanism, a robot control box and a visual perception module, and the servo mechanism comprises a six-degree-of-freedom manipulator, a steering engine mechanical arm and a steering engine mechanical leg; the fuselage hanging frame is installed on a cockpit seat, and a space for containing the robot control box is formed in the fuselage hanging frame; the fuselage bottom plate is horizontally placed on the helicopter cockpit seat; the six-degree-of-freedom manipulator is used for controlling a helicopter steering column; the steering engine mechanical arm is used for controlling a helicopter collective pitch rod; the steering engine mechanical leg is used for controlling a helicopter rudder; and the visual perception module is used for monitoring the environment of a cockpit and the scene outside the cockpit. The robot system can be installed in the helicopter cockpit, the helicopter is independently piloted by connecting a robot executing mechanism and a helicopter control mechanism, and rapid switching between a manned mode and an unmanned mode of the helicopter can be achieved under the condition that the helicopter is not modified.

The invention discloses a high-precision micro-displacement actuator utilizing a threaded parallel structure, which comprises two sets of parallel threaded screw rod structures, namely a first threaded screw rod and a first screw rod nut matched with the outside, and a second threaded screw rod with a hollow structure and a second screw rod nut matched with the outside, the first threaded lead screw and the second threaded lead screw are the same in spiral direction and have different thread leads, displacement output is achieved through the relative lead difference between the first threaded lead screw and the second threaded lead screw, the first threaded lead screw is connected with the mirror face through the guide rod, the first lead screw nut and the second threaded lead screw are both connected with the motor, and the second lead screw nut is fixed to a telescope rack. The actuator is mainly used for accurately adjusting the position of the optical mirror surface in the field of astronomical telescopes, and the mirror surface is continuously displaced without a gap or backlash phenomenon when the position of the mirror surface is adjusted. The position adjustment precision of the mirror surface can reach a submicron level or even a nanometer level.

The invention discloses a pseudo-hierarchical control method for a direct current microgrid system under photovoltaic high permeability. A photovoltaic panel is connected to a direct current microgridthrough a Buck circuit. The method comprises the following steps: adding a proportional scheduling part, a voltage regulation part and a droop control part into the microgrid system; actively collecting the actual active power Ppcc at the port of the power distribution network; calculating a power difference delta P between the port reference active power and the actual active power Ppcc, and transmitting the power difference delta P to each photovoltaic power supply; carrying out proportional scheduling control, voltage regulation control and droop control on each photovoltaic power supply to obtain a photovoltaic power supply output dp / dv reference value; and enabling each photovoltaic power supply to control actual output according to the dp / dv reference value. By means of the method,the photovoltaic generator keeps certain hot standby power to participate in mitigation of power fluctuation, equal-proportion schedulable control over the photovoltaic generator in the microgrid system is achieved, the stability and robustness of the direct-current microgrid system are improved, and reliable control over grid connection-island operation and switching of the direct-current microgrid system is achieved.

The invention discloses a valve device which comprises a driving part and a valve seat part, and further comprises a sliding block and a filtering part, wherein the valve seat part is provided with aninlet and an outlet; the inlet communicates with the valve cavity; the sliding block is supported by the valve seat part; the bottom surface of the sliding block fits the top surface of the valve seat part; the sliding block comprises flow channel parts and a blockage part which are circumferentially arranged around the rotating center of the sliding block; along the circumferential direction, the circulation areas of the flow channel parts are different; the flow channel parts communicate with a valve cavity; the sliding block can be driven by a driving part to rotate relative to the valve seat part, so that the flow channel parts can communicate with the outlet, or the outlet can be closed by the blockage part; and the filtering part is used for filtering a refrigerant which flows intothe flow channel parts. According to the valve device, the all-closed stuck phenomenon can be avoided through the structural improvement of a flow regulating part; furthermore, the flow deviation of the valve device can be controlled to be within a relatively small range; and accordingly, the requirements for the flow accuracy control of refrigerators and similar small-sized refrigerating systemscan be met.