32results about How to "Small control deviation" patented technology

A device and a method for controlling a position of a lateral edge of a continuous web of a recording medium in a printer or copier provides that sensors are provided. Signals of the sensors are supplied to a control device which includes an actuator. The actuator changes the position of the lateral edge of the web.

A device and a method for controlling a position of a lateral edge of a continuous web of a recording medium in a printer or copier provides that sensors are provided. Signals of the sensors are supplied to a control device which includes an actuator. The actuator changes the position of the lateral edge of the web.

The embodiment of the present invention discloses a method for controlling a food processor. The food processor may include a crushing cup, a heating device, a motor, and a temperature sensor. The temperature of the inner wall; when it is detected that the temperature of the inner wall of the crushing cup is less than or equal to the preset first temperature threshold T1, the heating device is controlled to heat with a preset power, so as to maintain the temperature of the inner wall of the crushing cup when the crushing cup is discharged Always greater than or equal to the preset second temperature threshold T2; wherein, the first temperature threshold T1 is greater than the second temperature threshold T2; the second temperature threshold T2 is greater than or equal to 60°C. Through the solution of this embodiment, the temperature of the inner wall of the crushing cup is kept at least above 60° C., which solves the problem of food sticking on the food processing cup and improves the cleaning effect.

The present invention relates to an active power control and fine instruction distribution method of an uncertain power supply, comprising the following steps: Step 1, collecting historical active power data and drawing a historical active power curve; Step 2, establishing a combined prediction based on historical active power data Model; step 3, finite time-domain rolling optimization: establish a multi-objective optimization function; step 4, forecast error feedback, use the error correction value to correct the predicted value at the next moment; step 5, finely allocate active commands. In the present invention, by incorporating links such as power prediction, rolling optimization, and feedback correction into uncertain power source active power control and fine command distribution, not only can the prediction accuracy be improved, but also power control deviation can be reduced.

The invention discloses a superheated steam temperature two-stage coordination, prediction and control method of a thermal power generating unit. The method designs a two-stage coordination and control algorithm and utilizes a GPC-P (generalized predictive control-proportion) cascade control strategy to respectively achieve the control of first-stage and second-stage desuperheating water spraying and enable the two-stage desuperheating water control to approximately decouple under the situation that a second-stage desuperheating water valve has adjusting allowance, accordingly the adjusting process of the first-stage desuperheating water spraying cannot cause the temperature fluctuation of the outlet of a last-stage superheater; and when the second-stage desuperheating water valve reaches an upper limit or a lower limit, makes full use of the adjusting allowance of the first-stage desuperheating water spraying to assist the second-stage desuperheating water spraying to control superheated steam temperature, and further reduces the deviation between a dynamic state and a steady state of the superheated steam temperature control, thereby improving the control performance of a system.

The embodiment of the invention provides an equipment control system based on blockchain. A method comprises the steps: equentially determining equipment control strategies corresponding to the current equipment state information according to the node participation sequence of each participation node through a pre-established blockchain, determining first project type information of a control project type matched with the equipment state information in a relative equipment control strategy; furthermore, according to the equipment control association condition between the control item type nodes matched with the equipment state information; determining a strategy execution process control curve; further determining second project type information; after the second project type information is combined, determining a target equipment control strategy from the equipment control strategies to carry out equipment control, so the integral state expression of the equipment control state and the differential expression between different project types are effectively considered, and the control deviation in the actual equipment control process is reduced.

The invention provides a control method of a graphite heater. The control method includes: applying a predetermined voltage to the graphite heater, wherein the voltage value of the predetermined voltage is fixed; starting from the first time when the predetermined voltage is applied, the following operations are performed: measuring the heat transmitted by the graphite heater through a heat flow sensor and based on the measured value of the heat flow sensor and the heating control curve corrected by the first time, the graphite heater is closed-loop controlled, wherein the first time is the graphite heater starts to apply the voltage Time for a linear response.

The invention discloses an electric deviation-correcting device. The device comprises a front conveying belt, a rear conveying belt, multiple compression rollers, a drum, a case, a visual sensor, a parallel light source, a high-speed counter, an industrial computer and a PLC; the multiple compression rollers, the drum and the case are relatively and fixedly arranged; the case drives the drum to rotate and can also drive the drum and the multiple compression rollers to reciprocate horizontally; the visual sensor can detect the deviation of the edge of a sizing material from a center line under the assistance of the parallel light source and transmits the deviation to the industrial computer in real time; the high-speed counter feeds the position of the rear conveying belt back to the industrial computer in real time; the industrial computer arranges feedback information into a group of data, stores the data accumulatively and meanwhile transmits the data to the PLC; the PLC controls horizontal motion of the case according to the feedback data, so that the center line of the sizing material and the radial center line of the drum coincide to the largest extent in the winding process. The deviation is corrected in the winding process, the distance between a deviation-correcting control point and a winding point is made close, and the possibility that a deviation-correcting system is disturbed is lowered.

The invention discloses a system for rearview mirror control based on ripples. The system comprises a rearview mirror control switch, a single-chip microcomputer, a motor driving module, a rearview mirror and a ripple detection counting module. The rearview mirror control switch is connected with the single-chip microcomputer, and the motor driving module is connected with a motor arranged in the rearview mirror. The motor driving module and the ripple detection counting module are integrated to a ripple detection counting and motor driving integrated circuit. A voltage modulation circuit and a control register are arranged in the ripple detection counting and motor driving integrated circuit, the voltage modulation circuit outputs supply voltage, the ripple detection counting module is in bi-directional connection with the control register, the control register is in output connection with the motor driving module, and the single-chip microcomputer is in communication connection with the control register through an SPI bus. The invention further discloses a method for rearview mirror control based on the ripples. According to the technical scheme, the problems of large control deviation and poor universality of an existing rearview mirror control technology are solved.

The invention relates to a denitration reductant adding control method based on time difference matching and a control device of the control method. By setting in-situ real-time test points, measuring corresponding parameters and depending on actual characteristics of a catalytic deoxidizing reaction of a denitration device, the time difference of flue gas from a flue gas flow speed and flow rate test point to an ammonia spraying region when the flue gas amount and the concentration of pollutants are changed, and the time difference between ammonia / air for spraying into a grating are mainly calculated, so that synchronous non-time-difference mixing is achieved; meanwhile, the flow speed of front nitric oxide and the flow speed of flue gas are taken as feedforward parameters, the concentration of sprayed and mixed nitric oxide and ammonia is taken as the feedback variable, the weight ratio of the feedforward to the feedback is reasonably set and adjusted, the reductant and the nitric oxide after mixed in flue gas react based on set efficiency before entering the denitration device, the amount of ammonia / nitrogen is rapidly and timely adjusted and matched and flexibly controlled under the working conditions such as various change amplitudes and wild fluctuations, the problem of adverse effects caused by the denitration device, a unit and the like is solved, and a significant effect of promoting pollution reduction is achieved.

The fuel injection pump control device controls a fuel-injector pressure from the injection supply eliminated by the variables of determined measured parameters. The fuel is injected and supplied to a target machine. A learning correction process-implementing device is provided for successive implementation of multiple kinds of learning correction process corresponding to the multiple implementedconditions. The implemented conditions are different in the strictness for a pressure parameter of pressurized parameter as a learning object and are used for the fuel injection pressure controller.

The invention provides a stroke detection and debugging method of a guide vane control loop with a pressure distribution valve. The method includes the following steps that: a guide vane control block diagram is designed according to the equipment structure of a pumped-hydro energy storage unit, and an electro-hydraulic converter and pressure distribution valve two-stage amplification mode is adopted to make a guide vane servomotor to act through oil pressure; guide vane servomotor and main pressure distribution valve stroke detection modes are determined; a linkage mechanism and a sensor are manufactured and installed, wherein the sensor is used for detecting the strokes of a main pressure distribution valve and a guide vane, and the linkage mechanism is used for converting the strokes of the main pressure distribution valve and the guide vane into the measurement strokes of the sensor; sensor calibration is performed on the guide vane and the main pressure distribution valve; the zero position of an electro-hydraulic converter and the compensation parameter of the neutral position of the main pressure distribution valve are obtained; and guide vane static reaction testing is performed, the acting condition of the guide vane is observed, and the compensation parameter is finely adjusted, so that guide vane control offset can be minimized; and control parameter setting is performed. With the method adopted, it can be ensured that the guide vane control closed-loop is within a reasonable range and has a certain margin, and therefore, later-stage maintenance and debugging can be facilitated.

The invention discloses a quick non-linear fuzzy predictive control method for a speed regulating system of a pumped storage unit. The quick non-linear fuzzy predictive control method includes the three steps of fuzzy PID parameter self-adaption, online rolling prediction and control law computing. By the adoption of the control method, the function that the fuzzy PID control parameters are adjusted automatically along with the working conditions is achieved, the future system state is predicted through a pumped storage unit speed regulating system non-linear model built in a controller by means of the online rolling prediction method, and the future system state quantity deviation information is considered when a real-time control law is set. By the adoption of the quick non-linear fuzzy predictive control method, the requirements of the control process of the pumped storage unit under different working conditions can be met, the control precision of the unit is improved effectively, and the transient state performance of the operating process of the unit is improved.

The invention discloses an S-shaped stainless steel cabinet suspension. The S-shaped stainless steel cabinet suspension is characterized by comprising a supporting frame, a semicircular cover clip and a PVC seat clip; the supporting frame comprises a supporting body and fixing sheets, the fixing sheets protruding out of the supporting body are connected to the reverse corners of the two ends of the supporting body, multiple evenly-arranged through holes are formed in the supporting body to form cover clip grooves, the semicircular cover clip is connected to the supporting body in the manner that the clip heads at the two ends of the semicircular cover clip are clamped in the corresponding cover clip grooves, multiple evenly-arranged through holes are formed in the supporting body to form seat clip grooves, and the PVC seat clip is connected to the supporting body in the manner that elastic clips at the bottom are fastened to the corresponding seat clip grooves. By the adoption of the S-shaped stainless steel cabinet suspension, the through holes of the cover clip grooves are formed in the cylindrical stainless steel supporting body, the clip heads are arranged at the two ends of the semicircular cover clip, a fixing pipeline of the semicircular cover clip is clamped to the corresponding through hole of the cover clip groove and can be installed and stabilized conveniently, the supporting frame is fixed to a wall face through lead screws, and therefore adjustment and supporting are convenient.