108 results about "Loop performance" patented technology

A system and method is provided which suppresses relative intensity noise in a fiber optic gyroscope by taking advantage of the frequency response of erbium fiber. In operation, the gain provided by the erbium fiber is added to the gain of the other components in the feedback loop to provide for stable loop performance up to about 250 kHz. The frequency response of the erbium fiber of about 3 kHz also provides a 6 db per octave roll-off, which, when used in a negative feedback control loop for controlling the current flowing to the gyroscope light source, allows for a relative intensity noise control loop with a bandwidth much greater than 3 kHz; this may be used in high performance gyroscope applications.

An effective non-intrusive data-based monitoring method may reduce the cost of control loop performance maintenance by screening and short-listing those control loops or valves that need maintenance. The invention comprises a data-based, model-free, non-invasive method that can automatically detect and quantify stiction present in control valves. The method does not require the implementation of any additional valve travel test or, as commonly known, bump test of the control loop. The method may detect and quantify stiction using controlled variable (pv), controller output (op) and set point (sp) data. It does not require valve positioner (mv) data.

A system and method for management of resource allocation for speculative fetched instructions following small backward branch instructions. An instruction fetch unit speculatively prefetches a memory line for each fetched memory line. Each memory line may have a small backward branch instruction, which is a backward branch instruction that has a target instruction within the same memory line. For each fetched memory line, the instruction fetch unit determines if a small backward branch instruction exists among the instructions within the memory line. If a small backward branch instruction is found and predicted taken, then the instruction fetch unit inhibits the speculative prefetch for that particular thread. The speculative prefetch may resume for that thread after the branch loop is completed. System resources may be better allocated during the iterations of the small backward branch loop.

A technique for synchronizing the servo control systems between two optical wireless links (OWLs) that are in communication with one another. This synchronization allows the alignment in time of the various tasks to be assigned in a desired time period. The synchronization is not intended to synchronize the two OWLs down to the processor clock level, but rather at the servo sampling level, preferably to within a few percent of the servo sampling time. This synchronization may be advantageous in improving processor efficiency and control loop performance, and or improving system calibrations.

The present invention provides a hardware-in-loop performance testing stand suitable for an automobile C-EPS system. The hardware-in-loop performance testing stand includes an oblique plane support platform, a steering wheel mounted above the stand face, a C-EPS steering column assembly, a steering resisting simulator, an automatic steering motor, a measurement and control system based on a dSPACE real-time simulation platform, a remote control main power box, support ground castors and the like. A lower inertia AC servo motor is used to initiatively load the C-EPS steering system on the hardware-in-loop performance testing stand through a L type planetary reducer. The automatic steering motor can replace a tester for testing in part of open-loop tests. The influences, such as friction, damp and inertia existed in the L type planetary reducer, on the resistance load is considered and the corresponding compensation control is performed during the simulation process of the steering resisting torque. Compared to other electric power steering testing stands, the hardware-in-loop performance testing stand can realize the development and performance testing of an EPS control system by utilizing the precious steering resistance simulation, and the hardware-in-loop performance testing stand is compact in structure and is movable.

The invention relates to a driver-in-the-loop vehicle performance optimizing simulation testing system and belongs to the technical field of electronic control of vehicles. The simulation testing system comprises a driver operation platform, a target machine controller, a target control generating unit and a target vehicle model unit, wherein the target machine controller is in communication connection with the target control generating unit and the target vehicle model unit, the target control generating unit comprises an automatic code generating and compiling module and a matrix laboratory (Matlab) / Simulink module, the Matlab / Simulink module is used for establishing a vehicle control strategy, and the automatic code generating and compiling module is used for converting the control strategy into a control code of the target machine controller. According to the driver-in-the-loop vehicle performance optimizing simulation testing system, the automatic code of the target machine controller is used for generating a kit, a control algorithm established by the Matlab / Simulink module is loaded in a target machine for running in a one-button mode through the automatically generated code, online verification and adjustment of the control algorithm are achievable through an online parameter adjusting interface, and parameters of the vehicle can be adjusted. The driver-in-the-loop vehicle performance optimizing simulation testing system has the advantages of being small in investment, convenient to construct, low in cost, efficient, easy to maintain, and good in timeliness.

The invention is a system for assessing and diagnosing performance of a control loop, comprising a Data Collection Section which collects data of two parameters of the control loop for an installed valve. The data collected is processed in a Linear Regression Section to generate a linear regression. A User Setting Port is provided to define the tolerance band and the boundary points. The generated linear regression, together with the defined tolerance band and boundary points are processed in a Linear Approximation Section to generate an acceptable reference region.

The invention relates to a method for locating and recognizing a process multi-loop fluctuation source, in particular to a method for locating and recognizing a process multi-loop variable fluctuation source in the field of the system performance estimation and the fault detection and diagnosis of a process industry. The method screens out disturbed fluctuation variables containing similar frequency components by combining spectral independent component analysis, carries out the Granger causality examination and analysis of the disturbed fluctuation variables and intuitively expresses the cause-effect influence relation among the loop variables by using a cause-effect relation diagram so as to represent propagation paths disturbed by fluctuation, simplifies the cause-effect relation diagram by utilizing apriori process knowledge and filters secondary cause-effect relation branches in an automatic threshold value searching mode to obtain a main propagation path for locating and recognizing a fluctuation source. The invention has the advantages that the accurate locating of the fluctuation source is beneficial to the maintenance and overhaul of subsequent fault loops and is an important link for solving the problem of performance lowering of a device with multi-level loops.

Systems and methods for advanced signaling between stages of transmitters and/or receivers in a digital communication system. One or more intermediate frequency signals and one or more control signals may share the same cable. Also, systems and methods are provided for calibrating head end receiver gain to improve subscriber unit power control loop performance.

The invention discloses a wind turbine aerodynamic-designing method considering static and dynamic influence of designed tip speed ratio on a wind wheel. The method uses a wind turbine closed loop performance index-average wind energy capture efficiency as a target function, the originally designed tip speed ratio, chord length and torsional angle separation optimizing process is improved into united optimization, so that wind-turbine aerodynamic design originally ignoring Maximum Power Point Tracking (MPPT) control dynamic can consider the shortcomings of tracking performance, and accordingly the static aerodynamic performance and tracking dynamic process of a wind turbine are coordinated. The method can effectively improve the wind energy capture efficiency of a variable-speed fan at turbulent-flow wind speed.

The invention discloses a single-loop control system performance evaluation method based on an ARMA model, which is used for solving the online evaluation problem of a control system. The method comprises the following steps of a, acquiring current moment data of a controlled variable PV of a to-be-evaluated control loop; b, preprocessing output data: removing abnormal data and performing stabilizing processing; c, calculating performance indexes of the control loop; and d, giving optimization suggestions of PI controller parameters according to the performance indexes of the control loop. Thetime series analysis is carried out on the historical output data in a period of time to obtain the performance indexes of the control loop; and an adjusting direction of the PI controller parametersis given according to the performance indexes of the control loop, so that the performance of a controller is optimal. According to the method, an accurate model and a transfer function matrix of thesystem are not needed, and only system operation data and delay time information are needed; the normal operation of the system is not influenced; and the method is suitable for online performance evaluation of an industrial field.

The invention relates to continuous type chemical equipment and a method and device for evaluating performance of control loops thereof in real time. The method comprises the steps that (1) obtaining self-control states, deviation values and deviation setting values of each control loop of the chemical equipment in real time, (2) calculating the loop self-control rate of each control loop at the current moment according to the self-control states and a calculation period of each control loop, (3) calculating the loop stability rate of each control loop at the current moment according to the deviation values, the deviation setting values and the calculation period of each control loop, and (4) generating equipment self-control rate statistical data and equipment stability rate statistical data of the chemical equipment according to the loop self-control rate and the loop stability rate of each effective control loop in the control loops. The continuous type chemical equipment and the method and device for evaluating the performance of the control loops thereof in real time overcome the defect that monitoring and evaluation can only be carried out on one certain control loop in the prior art.

The invention relates to a radio energy transmission tuning control technology, in particular to a radio energy transmission system tuning feedback control method considering dynamic performance. Themethod includes the steps of obtaining the phase nonlinear differential equation model of the transmitting end and the receiving end of a system through analysis by utilizing a coupling mode theory and a circuit theory; utilizing a small signal linearization method to linearize a phase nonlinear differential equation model nearby a system resonance point, and analyzing the closed-loop dynamic performance of the system; taking the linear model as a controlled object and the phase value of the output voltage of an inverter circuit of the system as a reference phase, and forming a system tuning closed-loop feedback control loop by using the phase value of the transmitting end and the phase difference value of the transmitting end and the receiving end as the given values of the system transmitting end and the receiving end control loops when the system works in a resonance state. The control method can quickly and accurately control a magnetic coupling wireless energy transmission systemto work under the working states of high transmission efficiency and power, and has good robustness for detuning disturbance.

The invention discloses a performance test device for a motor controller major loop of an electric vehicle. The performance test device for the motor controller major loop of the electric vehicle comprises a major loop test device, wherein the major loop test device is integrated with an oscilloscope and a control interface thereof, a pulse generator, a test device and a test platform; the pulse generator and the test device are connected with the test platform, the oscilloscope and the control interface of the oscilloscope. Parameter indexes of the motor controller major loop can be accurately obtained through relevant tests on major loop performance; the major loop of the motor controller serves as the main power circuit of the electric vehicle, so that measurement of the key parameters has very realistic significance; according to the design of the test device, the key performance parameters in the motor controller major loop can be tested at the same time on an integrated test platform, so that the use ratio of equipment is improved, and the repeated test is avoided. The measurement of key parameters is reasonable and valid, and the key performance indexes, such as short-circuit protection time and validity, major loop stray inductance measurement, spike voltage and IGBT (Insulated Gate Bipolar Transistor) on-off delay can provide beneficial design parameters and references for the design of the motor controller.

The invention discloses a control loop performance evaluation method and system based on permutation entropy. The method includes the steps that outlet pressure data of a natural gas pipeline controlloop is collected; the appropriate embedded dimension and delay time are selected, and the outlet pressure data sequence is reconstructed to obtain a reconstruction matrix; reconstruction components in the reconstruction matrix are sequenced according to the numerical value, and each reconstruction component obtains one symbol sequence; the occurrence probability of each symbol sequence is calculated and substituted into a permutation entropy formula to calculate the permutation entropy of the outlet pressure data; normalization processing is conducted on the permutation entropy to obtain thecontrol loop performance evaluated based on the permutation entropy algorithm. By adopting the method and the system, when the pressure control loop performance has a downtrend or an electric adjusting valve breaks down, the device is capable of automatically reminding a manager in time, in this way, labor intensity of staff is reduced greatly, operation management efficiency is improved, and excessive pressure fluctuation and safety production accidents in a natural gas distributing state are avoided or reduced.

The invention relates to an intermittent chemical device and a performance real-time evaluation method and device of control loops of the intermittent chemical device. The performance real-time evaluation method of the control loops of the intermittent chemical device comprises the steps that (1) the self-control state, a deviation value and a deviation set value of each control loop of the chemical device are obtained in real time; (2) a production cycle preset by an intermittent reaction is corrected, and the corrected production cycle serves as a calculation cycle; (3) the loop self-control rate of each control loop at the present time is calculated according to the self-control state and the calculation cycle of each control loop; (4) the loop stability rate of each control loop at the present time is calculated; (5) according to the loop self-control rate and the loop stability rate of each effective control loop in the control loops, device self-control rate statistical data and device stability rate statistical data of the chemical device are generated. The intermittent chemical device and the performance real-time evaluation method and device of the control loops of the intermittent chemical device overcome the defect that only a single control loop can be monitored and evaluated in the prior art.

The invention relates to a minimum variance based performance evaluation method and system of a control loop. The method comprises that data, including natural gas pressure parameters of an inlet and an outlet, of a natural gas line pressure control circuit is collected; an input-output model of the inlet and output pressure is established; natural gas pressure data of the inlet of the natural gas line serves as input, and a predicted output value is obtained via the input-output model; and the predicted output value is compared with the practically collected natural gas pressure data of the outlet of the natural gas line to obtain an error, and the performance of the control loop is evaluated on the basis of a minimum variance algorithm. Via the method and device, management staff is prompted automatically and timely when the performance of the pressure control loop tends to be decrease or an electric regulating valve has a fault, so that the labor intensity is reduced greatly, the operation and management efficiency is improved, and too wide pressure fluctuation and production accidents of sub natural gas distributing states can be avoided or reduced.

A system calculates a first ratio of a prediction error variance of a model of a controller error, and the lesser of a variance of a prediction error of a naïve predictor model and a variance of a controller error. The system rates a process controller as a function of the first ratio. The system also calculates a second ratio of a variance of the controller error and a variance of the prediction error of the naïve predictor model. The system rates the process controller a function of the second ratio. The system uses the first ratio, second ratio, other ratios, and discrete indicators in determining an embedded fusion for loop performance monitoring in the process controller and for displaying a value as a measure of the loop performance.

The invention belongs to the technical field of power equipment inspection and testing, and provides a direct current power supply system full loop resistance testing method for rail transit. The process includes the following steps: S1, performing preparation work; S2, measuring loop resistance of an uplink overhead contact line and a downlink overhead contact line, measuring the loop resistanceof the uplink overhead contact line and steel rails; and measuring the loop resistance of the uplink overhead contact line and the steel rails; and S3, obtaining loop resistance values measured by thestep S2, calculating the resistance R1 of the uplink overhead contact line, the resistance R2 of the downlink overhead contact line and the resistance R3 of the steel rails, and judging the major loop performance of a to-be-measured section according to calculation results. The method can measure the resistance of a complete circuit through the on and off of a switch in a to-be-measure loop, so that tests are simple and reliable, and the method can be widely applied to the field of rail transit direct current power supply system detection.