109 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 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.

A method and system is provided for detecting abnormal events by utilizing cluster trending construction and analysis mechanism. Two cluster profiles can be constructed: normal profile constructed during system normal operations; and real-time profile constructed during the actual operation of the system being monitored. This method can be used in many applications, including equipment failure detection, control loop performance assessment, plan monitoring, military target detection, etc.

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.

The invention discloses a control association modeling method of an elastic mode of an aircraft. The method comprises the following steps that a mechanism model of the elastic structure mode of the aircraft is built, and dynamic response data of the elastic mode is obtained; based on a beam element, the form of an agent model of the elastic mode is determined; coefficient setting is conducted by using a system identification method, a control association model of the elastic mode is obtained, the effectiveness of the built agent model is further verified based on the goodness of fit, the influence of the elastic mode on the open-loop performance and close-loop performance of an aircraft body is analyzed, and the association relationship between the body characteristic and the elastic mode is analyzed. Therefore, the influence rule of the elastic mode on the overall system and the design of the control system is found, and a good technical support is provided for the actual engineering design.

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.

A tuning control system and associated method is provided for continuously and automatically tuning a lobed amplitude slope matching filter (ASMF) to a band center of an interfering signal to provide improved rejection of an interfering signal coupled from a transmission antenna into a local receive antenna in the presence of local multi-path, thereby providing improved adaptive control loop performance. The tuning control system is provided as an element of an adaptive control loop.

Training signals can be chosen based on stored prior connection information to reduce the use of extra tones in transmitted training signals and thereby improve receiver performance. By choosing training signals based on the stored prior connection information, it is possible to make the training signals indirectly a function of the loop impairments. One advantage of this scheme is that we can choose to omit certain tones in the training signals, based on previous connection information, on a loop-by-loop basis. For example, in an ADSL Transceiver Unit-Central office end (ATU-C) device, per-local-loop prior connection information may be employed to select DMT tones to be included in downstream training signals. Similarly, in an ADSL Transceiver Unit-Remote terminal end (ATU-R) device, prior connection information may be employed to select DMT tones to be included in upstream training signals. In each case, local echoes are effectively reduced and local receiver training is improved without affecting eventual data transmission performance in the other direction. As a result, higher AGC gain and higher signal-to-quantization-noise ratios can be achieved, especially in the case of long loops. These benefits can allow (1) improvements in the loop performance in the receiving direction and / or (2) reductions in the requirements on the receiving ADC. In addition, crosstalks into the other wire pairs, especially those in the same bundle, are also reduced, improving the transmission environment on those pairs.

Training signals can be chosen based on stored prior connection information to reduce the use of extra tones in transmitted training signals and thereby improve receiver performance. By choosing training signals based on the stored prior connection information, it is possible to make the training signals indirectly a function of the loop impairments. One advantage of this scheme is that we can choose to omit certain tones in the training signals, based on previous connection information, on a loop-by-loop basis. For example, in an ADSL Transceiver Unit-Central office end (ATU-C) device, per-local-loop prior connection information may be employed to select DMT tones to be included in downstream training signals. Similarly, in an ADSL Transceiver Unit-Remote terminal end (ATU-R) device, prior connection information may be employed to select DMT tones to be included in upstream training signals. In each case, local echoes are effectively reduced and local receiver training is improved without affecting eventual data transmission performance in the other direction. As a result, higher AGC gain and higher signal-to-quantization-noise ratios can be achieved, especially in the case of long loops. These benefits can allow (1) improvements in the loop performance in the receiving direction and / or (2) reductions in the requirements on the receiving ADC. In addition, crosstalks into the other wire pairs, especially those in the same bundle, are also reduced, improving the transmission environment on those pairs.

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 discloses a testing device for tracking performance of a photoelectric stabilization tracking platform. The device comprises a collimator tube, a display screen and a video management computer, wherein the video management computer can directly output a practically recorded video image containing a true target and a background, and can also output a video image which is generated by software superposition and contains a simulated target and the background; the display screen is placed on a focal plane of the collimator tube, and displays the video image which is output by the video management computer and contains the background and the simulated target; and the collimator tube sends the collimated video image into a view field of the to-be-tested photoelectric stabilization tracking platform. The device can test the servo tracking loop performance of the photoelectric stabilization tracking platform, and can also test the performance of a video tracker according to variations of the background and the simulated target of the image on the display screen, so that the comprehensive tracking performance testing of the photoelectric stabilization tracking platform is achieved. The testing device has the advantages that the testing device is simple in structure, easy to operate, and wide in testing range.

A system and method for detecting burst noise during quadrature amplitude modulation (QAM) communications are provided. A QAM signal is acquired at a receiver in communication with a network. The QAM signal is demodulated at the receiver to identify a plurality of symbols. Amplitudes for each of the plurality of symbols are determined, and are compared to a predetermined threshold. For each amplitude that is greater than the predetermined threshold, information is recorded at the receiver relating to a burst noise event. The magnitude of the burst noise can be determined by measuring a difference between a received constellation point and a perimeter constellation point closest to the received constellation point. The information about the burst noise event can be transmitted to an error correction module for reducing future burst noise in the network. Equalizer coefficients and tracking loop performance can be adjusted / enhanced using the burst noise information.

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.

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.

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 relates to a satellite closed-loop test system, which comprises a dynamic simulator, an attitude and orbit dynamics model and an actuator model, wherein actuator model is configured to perform modeling on an actuator, the actuator model includes a thruster model and a reaction wheel model; the thruster model is configured to perform modeling on a thruster, the built model is an exponential model, and the rising edge and the falling edge of the thrust are simulated according to a satellite control instruction so as to generate thrust data; and the reaction wheel model is configured to perform modeling on a reaction wheel, and the reaction wheel model calculates the output torque of the reaction wheel according to the rotating speed of the reaction wheel. The invention furtherrelates to a method for carrying out a closed-loop test on the satellite. According to the scheme of the invention, the actuator can be accurately simulated, so that the closed-loop performance of thetest is ensured. In addition, the scheme of the invention is simple and low in cost, and does not need to perform great transformation on the existing test system, thereby being also applicable to the existing test system.

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.

Training signals can be chosen based on stored prior connection information to reduce the use of extra tones in transmitted training signals and thereby improve receiver performance. By choosing training signals based on the stored prior connection information, it is possible to make the training signals indirectly a function of the loop impairments. One advantage of this scheme is that we can choose to omit certain tones in the training signals, based on previous connection information, on a loop-by-loop basis. For example, in an ADSL Transceiver Unit-Central office end (ATU-C) device, per-local-loop prior connection information may be employed to select DMT tones to be included in downstream training signals. Similarly, in an ADSL Transceiver Unit-Remote terminal end (ATU-R) device, prior connection information may be employed to select DMT tones to be included in upstream training signals. In each case, local echoes are effectively reduced and local receiver training is improved without affecting eventual data transmission performance in the other direction. As a result, higher AGC gain and higher signal-to-quantization-noise ratios can be achieved, especially in the case of long loops. These benefits can allow (1) improvements in the loop performance in the receiving direction and / or (2) reductions in the requirements on the receiving ADC. In addition, crosstalks into the other wire pairs, especially those in the same bundle, are also reduced, improving the transmission environment on those pairs.

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 discloses a digital control system and method for a DC-DC power supply, and the system comprises: a sampling module which carries out the sampling of an output voltage and an output current, and obtains an output voltage sampling signal and an output current sampling signal; a PID control module which obtains a loop control quantity through the output voltage sampling signal and theoutput current sampling signal, and inputs the loop control quantity into a loop selector to obtain a PID loop control quantity; a dynamic detection module which is used for obtaining a current load state by outputting a current sampling signal and obtaining a current load dynamic frequency by switching time among different load states; a dynamic control module which is used for adjusting the PWMduty ratio signal; and a PWM module which is used for converting the adjusted PWM duty ratio signal into a PWM wave. According to the invention, the dynamic adjustment time is short, the influence onthe loop performance of the system is small, the response speed in the low-frequency load dynamic state is increased, and meanwhile the system can be kept to have high stability in the high-frequencyload dynamic state.