248 results about "Setpoint" patented technology

The present invention provides an airflow control loop that uses averaged airflow measurements without the problems that are normally encountered with averaging measurements, such as the delay introduced into the airflow control loop. This is accomplished, in the present invention, through a predictive control scheme. The predictive control scheme of the airflow control loop calculates the damper sensitivity, calculates the damper runtime needed to achieve setpoint, and then runs the damper for the determined period of time. In addition to the unique airflow control loop used to maintain the constant airflow into the room, the present invention also implements a digital form of proportional, integral, and derivative (PID) control to maintain the room temperature. The digital form of PID control uses non-linear gains which vary according to how far the measured temperature is from setpoint.

The invention discloses a vertical mill operation regulation and control system based on data mining and a method thereof. The method is characterized by using an integration characteristic screening method to carry out mining analysis on work condition data and acquiring a vertical mill health state assessment index; carrying out cluster mining analysis on a work condition state, acquiring a characteristic of each condition cluster, and acquiring each state distribution condition in historical work conditions; defining operation state types in the historical work conditions and acquiring a stable mode condition database; using an ARIMA algorithm to carry out training model on a determined characteristic value in a vertical mill health state characteristic acquisition module and predict a parameter change trend, and using a predicted value to assist state identification; combining the predicted value given by an ARIMA model, determining a vertical mill operation state; when the state is determined to be abnormal, reading a work condition record in the stable work condition mode database, acquiring a recommended regulation and control target value and regulating and controlling a controllable parameter at the moment. In the invention, vertical-mill qualitative and quantitative regulation and control suggestions can be accurately provided and a mill machine can work stably for a long time.

A system and a method for correcting the injection characteristics of at least one injector, having a device for storing information and an arrangement for controlling the at least one injector, taking into account the stored information. The information may be ascertained by comparing setpoint values to actual values individually at a plurality of test points of at least one injector, and may be specific.

The invention relates to a method for controlling a thermal cyclic process, in particular an Organic Rankine Cycle (ORC), which is operated with a working medium in conjunction with a dynamic heat source, whereby the method comprises the following steps: (a) determination of a setpoint value of a process variable of the thermal cyclic process from a value of an input parameter or respective values of a plurality of input parameters of the thermal cyclic process; (b) control of the thermal cyclic process with the determined setpoint value of the process variable as a target variable of the control; and (c) repeated execution of steps (a) and (b) when at least one value of the input parameters changes.

The present invention controls a room temperature by controlling an environmental control unit. A total span about a setpoint temperature is adjusted in accordance with a previous total span and a multiplicative factor. The multiplicative factor is periodically updated from a desired cycle time and a previous cycle time. The room temperature may also be controlled by adjusting a duty cycle for controlling an environmental control unit. The duty cycle is adjusted based on an error associated with a previous control cycle and an attenuation factor. A new control cycle may be started by cutting the previous control cycle or a current control cycle may be extended if a predetermined condition is detected. The control mode is selected based on environmental characteristics and room characteristics. The control mode may include a span control mode and a duty cycle control mode that is selected from the cycle rate.

A reverse bump test, for identifying the alignment of a sheetmaking system while the system remains in closed-loop control, includes the following steps: (a) leaving the control system in closed-loop, (b) artificially inserting a step signal on top of the measurement (or setpoint) profile from the scanner, (c) recording the data as the control system moves the actuators to remove the perceived disturbance (or setpoint change), and (d) refining or developing a model from the artificial measurement disturbance (or setpoint change) to the actuator profile. The technique supplies the probing / perturbation signal to the scanner measurement, which is equivalent to supplying the probing / perturbation signal to the setpoint target) rather than inserting bumps via the actuator set points as has been practiced traditionally.

A pool cleaner is provided including a top housing, a chassis and a computing system. The computing system can include a PID control module for maintaining a process variable at a setpoint value. The PID control module can receive the setpoint value for the process variable and can monitor the process variable to calculate the phase difference between the setpoint value of the process variable and the present state of the process variable. The PID control module can automatically tune the PID control module to account for the pool surface the pool cleaner is cleaning by using the phase difference previously calculated.

A method and apparatus for estimating and / or controlling mercury emissions in a steam generating unit. A model of the steam generating unit is used to predict mercury emissions. In one embodiment of the invention, the model is a neural network (NN) model. An optimizer may be used in connection with the model to determine optimal setpoint values for manipulated variables associated with operation of the steam generating unit.

A method and a device for controlling the speed of a vehicle are described. In the transition from a dynamic to a steady-state operating state, the initially accepted setpoint value is corrected using a correcting value which depends on the system deviation prevailing at the time when the longitudinal acceleration of the vehicle has reached, exceeded, or fallen below a predetermined threshold value.

The invention discloses a multi-target optimization prediction control method based on trapezoid interval soft constraint. The multi-target optimization prediction control method comprises a step1, establishing of a prediction model; step2, calculation of prediction out; step 3, feedback of correction; step 4, building of a trapezoid interval outside a tolerance interval; step 5, calculation of an optimization variable (img file+DDA0001238247080000011. Tif wi=70 he=47); step 6, building of a multi-target function; step 7, conversion of a multi-target problem into a single-target problem by using an omega-constraint method; step 8, acquisition of an optimal control increment by using a sequential quadratic programming algorithm. When the controlled variables exceed the tolerance interval, the controlled variables can enter the tolerance interval quickly to guarantee product quality. The building of the multi-target function is used to effectively prevent the mutual coupling among the various controlled variables, and the interval range of the constraint function is optimized by adopting an iterative algorithm, and then rapidity of operation of a system is guaranteed. By adopting combination of a set value control and a trapezoid interval soft constraint, the system can be operated at an ideal target value, and at the same time, the robustness and the freedom degree of the system area guaranteed to the greatest extent.

An optimizing control system includes at least a local control unit for controlling at least a control apparatus, an integration control apparatus for controlling a plurality of the local control units in integration fashion, and at least a control information standardization interface arranged between the local control unit and the integration control apparatus for standardizing the control information transmitted and received between the local control unit 31 and the integration control apparatus. The control information standardization interface includes a control condition information storage unit for storing the constraints, the evaluation function and the attribute information expressed by a predetermined standard physical quantity for controlling the local apparatus, and a physical quantity converter for converting the local physical status amount acquired from the local apparatus into a standard physical status amount and converting the optical setpoint calculated by the integration control apparatus into a local control goal value.

In a lithographic apparatus, a feedforward transfer function of a control system, is determined by: a) iteratively learning a feedforward output signal of the control system by iterative learning control for a given setpoint signal; b) determining a relation between the learned feedforward output signal and the setpoint signal; and c) applying the relation as the feedforward transfer function of the control system. A learned feedforward, which has been learned for one or more specific setpoint signals only, can be adapted to provide a setpoint signal dependent feedforward output signal. The learned feedforward can be made more robust against setpoint variations.

A cold-rolling train comprises a plurality of rolling stands (2) through which a cold strip (1) passes in succession and a strip feeding device (3) located prior to the first passed-through rolling stand (2-1). A nulled setpoint speed (v-0*) is sent to the strip feeding device (3) so that the strip feeding device (3) feeds the cold strip (1) to the first passed-through rolling stand (2-1) at a nulled actual speed (v-0) corresponding to the nulled setpoint speed (v-0*). A first setpoint speed (v-1*) is sent to the first passed-through rolling stand (2-1) so that rolls (7-1) of the first passed-through rolling stand (2-1) rotate at a first actual speed (v-1) corresponding to the first setpoint speed (v-1*). Between the first passed-through rolling stand (2-1) and the rolling stand (2-2) passed through next is a first thickness detection device (4-1), by means of which a first actual thickness (d-1) of the cold strip (1) is detected. A base output signal (delta) is determined using the first actual thickness (d-1) and a first setpoint thickness (d-1*), said base output signal being used to adjust the first setpoint speed (v-1*), but not the nulled setpoint speed (v-0*), so that the first actual thickness (d-1) is conformed to the first setpoint thickness (d-1*). Between the strip feeding device (3) and the first passed-through rolling stand (2-1) is a nulled thickness detection device (4-0), by means of which a nulled actual thickness (d-0) of the cold strip (1) is detected. The nulled setpoint speed (v-0*) is adjusted by way of a nulled feed-forward controller (9-0) in such a way that the product is adjusted to a setpoint mass flow by the nulled setpoint speed (v-0*) and the nulled actual thickness (d-0).

A method and a device for controlling a drive unit are provided, which allow for a reproducible load reversal damping. For this purpose, a setpoint value for an output variable of the drive unit is limited so that an overrun fuel cutoff of the drive unit is prevented. A limiting value for the setpoint value for the output variable is formed as a function of a loss value of the drive unit.

A method for control and discharge control of an electrical load, in which the control and discharge occurs by means of a control frame and a discharge frame, and in which one control frame and one discharge frame represent one switching cycle for the electrical load. A plurality of switching cycles are arranged following one another, wherein a controllable switch is connected in parallel to each point load so that each point load can be switched independently of the other point load during the switching cycle. A control unit monitors the electrical current flowing in the electrical load, and the control unit uses an actual / setpoint comparison to control the current to an adjustable setpoint so that a current that is as constant as possible flows into the electrical load. The controllable switches switch on the point loads during the control frame of a switching cycle, and the controllable switches switch off the point loads during the discharge frame of a switching cycle.