187results about How to "Shorten control time" patented technology

The invention discloses a hybrid MMC capacitor voltage balance control method which comprises the following steps that (1) a positive input record library, a negative input record library and a removal record library are built, (2) the maximum voltage deviation value of a sub-module capacitor in a bridge arm is determined, (3) according to the maximum voltage deviation value of the sub-module capacitor in the bridge arm, repeated input operation of the sub-module of the bridge arm is analyzed through judgment logic, and the record libraries are updated, (4) according to the bridge arm level difference before a moment and after the moment, sub-module switching operation is carried out in the bridge arm through a logic judgment and control strategy, and the record libraries are updated. By means of the method, switch frequency of the sub-module is effectively lowered on the situation that capacitor voltage keeps stable, converter loss is reduced, and meanwhile the problem that system operation performance deteriorates due to sequencing problems can be reduced.

The invention discloses an electric cooker remote control method, and relates to the technical field of electric appliance remote control. The method includes the steps that a user remotely sends cooking information to an electric cooker through a mobile terminal or a computer, the electric cooker carries out system self-checking after receiving the cooking information and feeds back a self-checking result to the user, and the electric cooker starts to cook after the self-checking result is detected to be normal. A central processor of the electric cooker controls the processes of automatic rice measuring, rice adding, water feeding, rice washing and cooking. The electric cooker remote control method has the advantages that people can send the cooking information to the electric cooker at home at any place, the electric cooker automatic executes all procedures of rice cooking, rice is precisely measured, water is added, the rice does not need to be soaked, and quality and taste of cooked rice are not influenced. The user can know whether water supplies and power supplies at home are cut off in real time, whether rice in a rice barn is insufficient and other information. Binding of the electric cooker and the mobile terminal or the computer achieves the fact that multiple mobile terminals or computers control one electric cooker, and any person at home can remotely control the electric cooker for cooking.

The invention relates to a compound control method of a speed and a position of a hydraulic cylinder system based on displacement feedback, which comprises the following steps: 1) a displacement sensor transmits an acquired actual displacement value y1 of a hydraulic cylinder piston to a controller, 2) the controller compares the actual displacement value y1 of the hydraulic cylinder with a set displacement value y0 to obtain a displacement deviation absolute value of deltay, and judges whether the displacement deviation absolute value of deltay is smaller than the set threshold, if so, executing the step 3), if not, executing the step 4), 3) the current output by the controller is rated current of a proportional valve, namely the proportional valve is totally opened, the flow through the proportional valve is maximal, and the hydraulic cylinder piston quickly moves, and 4) the controller converts the displacement deviation absolute value of deltay into an output current i according to a preset relation function, and controls the proportional valve through the output current i so as to realize fast control for the speed following the displacement. The compound control method, disclosed by the invention, has the advantages of shorter control time, lower realization cost and the like in comparison with the prior art.

Measurement system and process for measuring a cross-direction profile of specific properties of at least one of a material web and a coating on the material web. The system includes at least one stationary cross-direction profile measurement device having at least one radiation source adapted to irradiate the at least one of the material web and the coating on the material web in a plurality of defined and different wavelength ranges, and at least one sensor adapted to measure the intensity of radiation affected by the at least one of the material web and the coating on the material web. The system also includes at least one measurement and/or evaluation electronics system. Each sensor detects only one of the defined different wavelength ranges of the radiation at a specific point in time. The process includes irradiating the at least one of the material web and the coating on the material web with a plurality of defined and different wavelength ranges via at least one radiation source, and measuring an intensity of radiation affected by the at least one of the material web and the coating on the material web with at least one sensor. Only one of the defined different wavelength ranges of the radiation is measured by each sensor at a specific point in time.

The invention provides a multi-shaft AC servo motor control device, which comprises a parallel bus communication module, a PWM cycle counter module, an encoder feedback signal processing module, an AD interface module, a first sequential control module, a position loop computation module, a first filter group, a second filter group, a speed loop computation module, a third filter group, a data conditioning module, a CLARK transformation module, a PARK transformation module, first and second current loop computation modules, a counter electromotive force compensation module, a cross decoupling compensation module, a bus voltage compensation module, an IPARK transformation module, an ICLARK transformation module, an SVPWM module, a second sequential control module, a PWM comparator module and a dead zone insertion module. When the multi-shaft AC servo motor control device is used, the control hysteresis of a position loop, a speed loop and a current loop can be eliminated, the real-time property is good and the control precision is high; and through the global PWM cycle counter, the complete synchronization between multiple motor shafts can be realized.

The invention relates to a coal mine underground gas extraction long drilled hole and coiled-tubing-in-casing perforation staged fracturing method. The method includes the steps that first, a gas extraction long drilled hole is constructed in a mudstone or sandstone roof with a certain distance to the top boundary of a broken soft coal seam or a hard layer of the broken soft coal seam or a hard coal seam with a good coal body structure; second, a guiding shoe and a rigid casing are lowered; third, cement paste blocking is carried out on annular space between the gas extraction long drilled hole and the rigid casing so as to solidify the hole; fourth, packing staging is carried out through a mode of dragging a packer by coiled tubing, an ejector carries out sand blasting perforation, and fracturing is carried out on the annulus between the coiled tubing and the casing; fifth, a fracturing tool is lifted out, and uniform blowout of fracturing fluid is carried out. The method can solve the problems that in existing gas extraction hole-drilling, hole forming is difficult, the crack initiation position of fracturing cracks is not determined, the fracturing cracks extend short, the fracturing modification effect is poor, the extraction affecting range is small and nonuniform, and extraction duration is short, and realizes gas extraction long drilled hole forming and multi-level precise staged fracturing.

An automatic focusing apparatus for performing focus adjustment of an object image includes an image pickup portion, an evaluating portion, a focus motor for driving a focus lens, and drive controlling portion. The image pickup portion converts an optical signal of an object image into an electric video signal. The evaluating portion calculates an evaluation value from the video signal obtained by the image pickup portion. The drive controlling portion controls an acceleration/deceleration drive of the focus motor according to a acceleration/deceleration function. The drive controlling portion accelerates the drive of the focus motor up to a target velocity, and decelerates the drive of the focus motor from the target velocity after the target velocity is reached, in synchronization with a synchronization signal for generating a timing of starting exposure for the optical signal of the image pickup portion.

The invention discloses a cascaded pump station water conveying system optimized running-control coupling and coordinating method and system. The method comprises the steps of building a cascaded pump station water conveying system optimized running model, and solving a cascaded pump station water conveying system optimized running scheme; building a storage capacity compensation based pre-pumping water level control module by taking the water conveying flow and a corresponding water surface line in the optimized running scheme as control objectives, and fabricating each pump station control scheme; building a cascaded pump station water conveying system optimized running-control coupling model based on the optimized running model and the storage capacity compensation based pre-pumping water level control model; building a cascaded pump station water conveying running-control scheme evaluation model; building a cascaded pump station water conveying system optimized running-control coupling and coordinating model; and acquiring an optimized running scheme and a corresponding control scheme through coupling and solving the coupling and coordinating model. The method and the system disclosed by the invention provide technical support for optimized running and control of similar cascaded pump station water conveying systems in China such as an eastern route of the south-to-north water transfer project, the water conveying efficiency is improved, and the water conveying cost is reduced.

The invention discloses a robot grabbing method based on camera communication connection and a system thereof, and relates to the technical field of robots. The method comprises the following steps: step 1, a main control computer establishes a temporary matching relationship between a camera and a robot in the neighborhood; step 2, the robot implements grabbing for a target workpiece; step 3, thecamera acquires the grabbing posture image of the robot and sends the grabbing posture image to the main control computer; step 4, the main control computer matches the grabbing posture image with atemplate grabbing image; step 5, the main control computer calculates the position offset and the difference value between the grabbing posture image and the template grabbing image to generate a matching degree; step 6, the robot adjusts a grabbing posture according to the matching degree; and step 7, the robot transfers the target workpiece. Communication is realized between the robot in the neighborhood and the camera, and the control time is shortened and the grabbing efficiency is increased in combination with a database; and through the real-time matching between the grabbing posture image and the template grabbing image, the accuracy of the grabbing posture is ensured, and the role of protection is played on the target workpiece.

The invention discloses a temperature control system and method for a miniature rapid temperature change experiment box, a miniature cooling system and a PTC (positive temperature coefficient) heaterare adopted as hardware, and an adaptive fuzzy PID (proportion integration differentiation) algorithm is adopted to control the frequency of a solid-state relay to control the PTC heating time, so that the temperature in a constant-temperature box body is controlled. The constant-temperature box automatically judges heating or cooling according to a set value input by a current system, so that theset target temperature is automatically and quickly reached, and the temperature control range is -10-80 DEG C. According to the system, the self-adaptive fuzzy incremental PID algorithm is used, sothat the control precision (steady-state error) of the temperature control system under large inertia and large delay is solved, and the stabilization time of the rapid temperature change control system is shortened.

The invention provides a laser drilling control method and belongs to the field of laser processing. The laser drilling control method comprises the following steps: arranging spiral line drawing archives; adjusting a laser and conveying a to-be-processed product to a processing position; setting the starting point of a 3D vibrating mirror, wherein the 3D vibrating mirror sets the starting point of the laser focal point on the lower surface of the to-be-processed product; linking the XY axis and Z axis of the vibrating mirror of the laser, and adjusting the laser beam to drill from the lower surface to the upper surface of glass along the set continuous spiral line; and travelling on the entire spiral line with set layers, turning off the laser, and enabling the XY axis and Z axis of the vibrating mirror to return to the initial position. The laser drilling control method has the following benefits: the processing efficiency is improved, a connecting knife edge for turning on and off laser is not formed from bottom up, and the fracture surface is smooth.

There is provided an onboard motor controller that starts a failsafe process in short time at a vehicle collision. A control circuit in the motor controller acquires an acceleration detected by an acceleration sensor. When the acceleration is equal to or higher than a prescribed value, the control circuit determines that a collision of the vehicle has occurred, and executes a switching process of a control mode of a motor. The control circuit immediately switches the control mode of a motor from voltage phase control to current vector control when the collision is detected. The control circuit reads current values from current detectors. When an overcurrent is detected, the control circuit executes a failsafe process to turn off the MOSFETs of an inverter. The control circuit stops a supply of electricity to the inverter by turning off a power supply relay, thereby stopping the rotation of the motor.

The invention discloses a control device for a coach emergency escape door. The control device for the coach emergency escape door comprises a rotary disc, a pull line and an active telescopic device, the rotary disc is mounted on a machine frame by a rotary shaft, one end of the pull line is mounted on the edge of the rotary disc in the circumference direction of the rotary disc, the other end of the pull line is connected with an escape door lock-up mechanism, one end of the active extend-retract device is hinged to the machine frame, and the other end of the active telescopic device is hinged to the rotary disc. The control device for the coach emergency escape door has the advantages of being high in control speed and safety, practical and reliable and the like.

The invention relates to a railway car positioning system and method based on an encoder and racks, particularly relates to a positioning system based on the encoder and the racks, and the positioning system can control a non-adjustable-speed motor to achieve high-precision positioning. The invention provides the railway car positioning system and method based on the encoder and the racks, and the system and the method are accurate in positioning and are short in positioning control time. The railway positioning system based on the encoder and the racks includes a railway, and a railway car is arranged on the railway. The structural features of the railway positioning system are that: a plurality of racks are arranged on the railway in the railway length direction; the numbers of teeth of all the racks are different; one rack is corresponding to one work target position; the railway car is provided with a gear which is engaged with the racks; the center shaft of the gear is connected to a rotatable signal input end of the encoder arranged on the railway car; and a signal output port of the encoder is connected to a signal input port of a PLC.

The invention relates to the technical field of a fuel cell and discloses a hydrogen injector control method and device, and a storage medium. A power demand signal from a vehicle controller is received, an air flow demand value is determined according to the power demand signal, the air flow of an input fuel cell is controlled according to the air flow demand value, a current air flow value of the input fuel cell is detected, a hydrogen flow demand value is matched in real time based on the current air flow value, a hydrogen injector is controlled for injecting the hydrogen according to the hydrogen flow demand value, in the control process, and the hydrogen injection flow is controlled based on the air flow of the input fuel cell. The method is advantaged in that performing PID control based on the back end pressure feedback of a proportional valve in the prior art is avoided, and the control time is effectively shortened.

The invention relates to an underground real-time control system for the density of drilling fluid. The underground real-time control system for the density of the drilling fluid comprises a drilling rig, an air compressor, a slurry pump, an intermediate transmission device, an electromagnetic valve, a packer, a wireless receiver and a ground control system, wherein the intermediate transmission device consists of an inner barrel and an outer barrel, which are coaxially arranged; the air compressor is connected to an air inlet of the inner barrel; the slurry pump is connected to a fluid inlet of the outer barrel; the tail end of the inner barrel is connected with an inner drill rod; the tail end of the outer barrel is connected with an outer drill rod; the tail end of the outer drill rod is connected with a drill collar; the tail end of the inner drill rod is fixedly arranged at the bottom of the drill collar; the tail end of the inner drill rod is connected with the electromagnetic valve; the packer is arranged on the outer drill rod; a wireless density sensor and a wireless pressure sensor are arranged at the bottom of the drill collar; the wireless receiver is connected with the ground control system. According to the system, the advantages of three drilling technologies, i.e. an overbalance drilling technology, an under-balanced drilling technology and a managed pressure drilling technology, are fully utilized, so that an underground pressure difference can be switched between an overbalanced state, an under-balanced state and a near-balanced state, the drilling rig can safely and efficiently reach a destination layer, the non-production time can be reduced, and the drilling cost can be lowered.