69 results about "Closed loop response" patented technology

A closed loop system for and method of delivering information obtained from an information content source to a playback device and to receive response information related to the information content. The system comprises an information source (710), a mobile-content server (735) and a playback device (755). The mobile content server (735) comprises a web site, a database, and a server application. The web site interfaces to the information content source (710) and is available for access by a user. The database stores, among other things, user information. The server application operates on the mobile-content server (735) and enables the mobile-content server (735) to: retrieve the user information from the database; retrieve content segments or programming information from the information content source (710); deliver the content segments or programming information to the playback device (755) to the client platform; and receive response information from the playback device (755).

A method is disclosed for writing servo patterns for tracks on a rotating magnetic disk medium of a disk drive. Servo patterns are written on a reference track of the disk medium. Track following of the written servo patterns on the reference track is performed using a servo loop having a closed-loop response. A position error signal is generated for the reference track based on the track following. A correction signal is generated based on the track following using an observer of a one-dimensional state model that is equivalent to a two-dimensional state model of the servo loop. Servo patterns are written on a target track during track following of the reference track. The position error signal of the servo loop is adjusted based on the correction signal to reduce radial error propagation from the reference track to the target track.

A method is disclosed for writing servo patterns for tracks on a rotating magnetic disk medium of a magnetic disk drive. In the method, track following is performed along a reference track, defined by previously written servo burst patterns, using a servo loop having a closed-loop response. A position error signal is generated for the reference track based on the track following. A correction signal is generated based on the track following using an observer of a one-dimensional state model that is equivalent to the two-dimensional state model of the servo loop. Servo patterns are written at a target radial location on the magnetic disk medium during track following of the reference track. The position error signal of the servo loop is adjusted based on the correction signal to reduce radial error propagation from the reference track to the servo burst patterns at the target radial location.

A pattern recognition adaptive controller configured to dynamically adjust proportional gain and integral time control parameters based upon patterns that characterize the closed-loop response. The pattern recognition adaptive controller receives a sampled signal representative of the controlled variable, and determines a smoothed signal based on the sampled signal. The controller determines an estimated noise level of the sampled signal and determines if the control output and process output are oscillating quickly based on predefined criteria. The controller adjusts the gain used by the controller if the control output and process output are oscillating quickly. If the control output and process are not oscillating quickly, the controller determines whether there has been a significant load disturbance, whether there is an insignificant pattern, and / or whether the control output is saturated. Based on the results of these determinations, the controller either leaves the gain and integral time unchanged or determines new gain and integral time. The adjusted control parameters are then used to control the actuator, thereby causing the controller to affect the process.

An electrosurgical generator has a control system formed by an array of logic gates programmed to execute mathematical algorithms for regulating at least one parameter of output power, output voltage or output current of an output electrosurgical signal in a closed loop response to sensed values of the output voltage and the output current.

The invention relates to the technical field of PID control, and discloses a fractional order integration PID controller setting and self-setting method. The method specifically comprises the following steps that firstly, the Bode ideal transfer function order beta and the amplitude cross-over frequency omega c are appropriately selected to meet the formula: 1<beta<2 and the formula: 0<omega c<omega max; secondly, when a controlled object mathematical model P(s) is known, the low order derivative of a transfer function model of a controlled object is solved, and then the third step is carried out, and when the controlled object mathematical model P(s) is unknown, the system information is identified according to the step response of the controlled object or the relay closed loop response, and the third step is carried out, wherein the two conditions are not met, the process is ended; thirdly, PID controller parameters with the fractional order integration are fast determined according to the parameter setting formula. According to the technical scheme, automatic control of an ordinary industrial process can be achieved easily.

The invention relates to an electric car driving motor torque closed-loop control method. The electric car driving motor torque closed-loop control method is composed of a whole vehicle control unit,a motor controller, an inversion switching circuit, a permanent magnet synchronous motor, a position sensor and a three-phase current sensor. The electric car driving motor torque closed-loop controlmethod is characterized in that whether active short circuit control is carried out according to an active short circuit control instruction (ASC-Enable) and the motor mechanical rotating speed, the output torque of the permanent magnet synchronous motor is calculated by means of an active short circuit method without depending on motor parameters such as stator resistance, rectangular axis voltage and the like, and the calculated value is more accurate; the motor controller then carries out PI regulation control according to a torque command emitted by the whole vehicle control unit and the torque on-line calculated value, the accuracy of the torque output absolute value can be improved, and the torque closed-loop response time is shortened.

A power converter output voltage regulation method in which sensed output voltages and sensed currents are stored in a memory during a plurality of time intervals. In each time interval the sensed output voltage and the sensed current is compared with the sensed output voltage and sensed currents in time intervals previously stored in the memory. If preceding data are found to match the most recent data, an open loop response is applied. If the most recent data and stored previous data do not match, a closed loop response is applied.

A method to provide active noise control to reduce noise and vibration in reverberant acoustic enclosures such as aircraft, vehicles, appliances, instruments, industrial equipment and the like is presented. A continuous-time multi-input multi-output (MIMO) state space mathematical model of the plant is obtained via analytical modeling and system identification. Compensation is designed to render the mathematical model passive in the sense of mathematical system theory. The compensated system is checked to ensure robustness of the passive property of the plant. The check ensures that the passivity is preserved if the mathematical model parameters are perturbed from nominal values. A passivity-based controller is designed and verified using numerical simulations and then tested. The controller is designed so that the resulting closed-loop response shows the desired noise reduction.

A method of preventing surge in a dynamic compressor is disclosed. The method includes providing an anti-surge valve having an adjustable opening for increasing the flow through a dynamic compressor. The next step is sensing process conditions in the dynamic control to determine a compressor load variable. A control system estimates a process disturbance model using the compressor load variable. The control system then adjusts a safety margin using a rate limited response and initiates a closed loop response using process feedback based on the process disturbance model. The control system adjusts the opening of the anti-surge valve according to the safety margin and closed loop response.

Look-ahead delta sigma modulators of the signal processing systems described herein can anticipate quantizer overload. By anticipating quantizer overload, the look-ahead delta sigma modulators can select an output value y(n) that may have a lower SNR but will prevent quantizer overload in the future. A quantizer overload protection process determines the amount of look-ahead depth to drive state variables of a loop filter of the look-ahead delta sigma modulator to values that would prevent future quantizer overload. By substituting a quantizer of the look-ahead delta sigma modulator with a gain and determining a closed loop impulse response of a look-ahead delta-sigma modulator, the discrete time to achieve an absolute value maximum closed loop response magnitude of the look-ahead delta-sigma modulator has been determined to be directly related to the look-ahead depth that will prevent future quantizer overload.

The invention provides a PCB detection device and method, and relates to the technical field of PCB detection. The device comprises a central processing chip circuit, an abnormal state feedback processing circuit and sensor chip circuits arranged in different tested circuit parts of a PCB. In each sensor chip circuit, a temperature detection circuit, a voltage detection circuit and a current detection circuit are integrated; the sensor chip circuits detect operation parameters of the different tested circuit parts of the PCB; the central processing chip circuit determines whether the operationparameters are abnormal; and the abnormal state feedback processing circuit selects a preset feedback processing strategy according to the abnormal operation parameter, and controls and processes thetested circuit part, corresponding to the abnormal operation parameter, of the PCB according to the preset feedback processing strategy. Thus, automatic detection and closed-loop response processingcan be realized for the whole system.

A pattern recognition adaptive controller configured to dynamically adjust proportional gain and integral time control parameters based upon patterns that characterize the closed-loop response. The pattern recognition adaptive controller receives a sampled signal representative of the controlled variable, and determines a smoothed signal based on the sampled signal. The controller determines an estimated noise level of the sampled signal and determines if the control output and process output are oscillating quickly based on predefined criteria. The controller adjusts the gain used by the controller if the control output and process output are oscillating quickly. If the control output and process are not oscillating quickly, the controller determines whether there has been a significant load disturbance, whether there is an insignificant pattern, and / or whether the control output is saturated. Based on the results of these determinations, the controller either leaves the gain and integral time unchanged or determines new gain and integral time. The adjusted control parameters are then used to control the actuator, thereby causing the controller to affect the process.

A method and apparatus for single port modulation of a phase locked loop frequency modulator includes a phase locked loop with a voltage controlled oscillator (VCO) and a integer loop for multiplying up the output of the VCO which is divided by a fractional-N modulator and divider in the feedback control. The integer loop enables the use of a high frequency reference oscillator that allows a closed loop response of the phase locked loop having a bandwidth that is wider than the modulation bandwidth.

The invention discloses a closed-loop response method for a natural gas engine torque. The closed-loop response method comprises the following steps: step I, in order to ensure the accuracy of calculation of the torque, a natural gas flow is accurately calculated, and a friction torque and the heat efficiency at each point of an engine are accurately calibrated; step II, after the engine receives the percentage of a command torque against a reference torque, the percentage is converted into the percentage against each rotational speed external characteristic indicated torque firstly; step III, a table is looked up to acquire a throttle opening degree table corresponding to the rotational speed and the load of the engine, and the engine outputs a throttle opening degree; step IV, an engine indicated torque at the time is calculated to obtain the percentage of the engine output torque; and step V, the percentage of the engine output torque is compared to the percentage of the command torque, and the throttle opening degree is regulated through PID control to enable the engine output torque to be consistent with that of the command torque. According to the closed-loop response method, the difference between the actual output torque of the engine and a torque command value is zero under the condition of generating variations on environment boundary condition of the engine.

Known method suitable for implementation in a computer program product for VCT closed-loop control system generally includes an integrator to eliminate the steady state error. A novel method suitable for implementation in a computer program product includes a set point filter as well to reduce the closed-loop control overshoot. Low cam torque frequency can reduce the stability of a closed-loop control system when combined with the integral action, and it can also compromise the effect of set point filter. This novel method addresses these two issues by identifying the cam torque direction and pausing control updating when there is no torque available at the desired direction.

The invention discloses a method for single-joint power-assisting exoskeleton inversion self-adaptive robust force control. Targeted at problems of reinforcing and following of driving of a power-assisting exoskeleton by a hydraulic cylinder, and based on an integral single-joint power-assisting exoskeleton dynamic model, with consideration given to coupling effects between different layers in terms of dynamics and adoption of an inversion controller design method, bandwidth restriction brought by power-assisting exoskeleton traditional cascade control is overcome and a larger closed loop bandwidth is gained. According to the invention, when a single-joint exoskeleton undertakes a weight, a man-machine active force is minimized to realize power assisting and motion following a man. An inversion self-adaptive robust force control algorithm (ARC) is employed to effectively overcome influences by model nondeterminacy of a single-joint power-assisting exoskeleton system, so that high robustness and faster closed loop response are provided; a good following and power-assisting effect on motions of human by the single-joint exoskeleton is realized; and a relatively high application value is realized.

A transceiver 1 includes a frequency synthesizer 2 configured to generate an output signal 3 for use as a carrier signal for transmission and / or a signal with a channel frequency for reception, wherein the frequency synthesizer is a sub-sampling based frequency locked loop frequency synthesizer. The combination of a FLL and sub-sampling allows to obtain a sub-sample based locked loop with a closed loop response similar to a PLL but with improved settling time and improved suppression of high frequency components of the quantization noise due to the sampling process. The transceiver allows to obtain a frequency synthesizer with improved characteristics with respect to at least one of power consumption, locking characteristic, design optimization characteristics compared to non-sub-sampling PLL based frequency synthesizers.

A method of controlling a gas distribution system in which one or more air separation plants supply gaseous oxygen and nitrogen products to pipeline sections. The air separation plants are controlled by supervisory control systems that direct production rates of the gaseous products to be consumed by customers connected to the pipeline sections. The gas distribution system is controlled by a model predictive control system in which empirically determined open loop response models are used to generate open loop responses of the pipeline sections due to changes in customer demands. Optimized closed loop responses in production rate requests to the supervisory control systems are generated by model predictive control techniques.

An ablation system observes and monitors ablation parameters, including temperature, impedance, and / or the system's own closed-loop response to these ablation parameters in delivery of power to one or more ablation electrodes, including cessation of power delivery to one or more electrodes while maintaining power delivery to one or more other electrodes. The system comprises a catheter with one or more electrodes and a detection circuitry configured to detect an ablation parameter for each electrode, a controller coupled to the catheter, the controller having a processing unit and a memory storing instructions that, when executed by the processing unit, cause the processing unit to: receive a detected ablation parameter for each electrode from the detection circuitry, control a power supplied to each violating electrode to have a reduced power when the respective detected ablation parameter violates a defined ablation parameter, detect a rate of power reduction for each violating electrode, and stop the power supplied to each violating electrode when a respective detected rate of power reduction exceeds a threshold rate of power reduction.

The invention discloses an uncertainty system PID controller design method based on time-varying reliability. According to the method, for an uncertain variable PID closed-loop control system, a PID controller with the minimum control force index is designed by calculating a closed-loop response interval and time-varying reliability and taking the time-varying reliability as a constraint. According to the method, interval description is carried out on uncertain variables, a response interval is calculated in combination with a point collocation technology, and time-varying reliability is calculated in combination with a first crossing theory. And finally, the PID controller with the minimum control force index is designed by taking the time-varying reliability as the constraint.

A method of preventing surge in a dynamic compressor is disclosed. The method includes providing an anti-surge valve having an adjustable opening for increasing the flow through a dynamic compressor. The next step is sensing process conditions in the dynamic control to determine a compressor load variable. A control system estimates a process disturbance model using the compressor load variable. The control system then adjusts a safety margin using a rate limited response and initiates a closed loop response using process feedback based on the process disturbance model. The control system adjusts the opening of the anti-surge valve according to the safety margin and closed loop response.

A method to provide active noise control to reduce noise and vibration in reverberant acoustic enclosures such as aircraft, vehicles, appliances, instruments, industrial equipment and the like is presented. A continuous-time multi-input multi-output (MIMO) state space mathematical model of the plant is obtained via analytical modeling and system identification. Compensation is designed to render the mathematical model passive in the sense of mathematical system theory. The compensated system is checked to ensure robustness of the passive property of the plant. The check ensures that the passivity is preserved if the mathematical model parameters are perturbed from nominal values. A passivity-based controller is designed and verified using numerical simulations and then tested. The controller is designed so that the resulting closed-loop response shows the desired noise reduction.

[Problem]An object of the present invention is to provide a motor control unit that achieves desired performance more simply with higher accuracy by setting a frequency characteristic according to a state of the control unit and automatically adjusting a control gain by the set value, and to provide an electric power steering apparatus equipped with the same.[Means for Solving the Problem]A motor control unit that comprises a current command value calculating section that calculates a current command value of a motor applying a steering assist torque to a steering system of a vehicle, and a feedback section that controls a motor current flowing to the motor through a feedback mechanism based on the current command value comprises: a control unit state detecting section that detects at least one state of the motor control unit, and outputs the state as a control unit state; and a characteristic changing section that changes a setting of a closed loop response characteristic of the feedback section in real time depending on the control unit state.

The invention belongs to the electrical control technology field, relates to the robust control technology field and especially relates to a magnetic levitation bearing robust controller constructionmethod based on a multi-objective genetic algorithm. The method is characterized by summarizing the general formula of a robust controller weight matrix function and limiting the range of a weight function parameter; and giving the adjustment direction of manual weight parameter adjustment, and solving the blindness of a beginner choosing a robust controller weight function. In the invention, a multi-objective genetic algorithm is further adopted to optimize the weight function parameter and a designer can compromise between closed loop response performance and a control signal according to anactual demand so as to acquire an optimal robust H-infinite controller under two objectives. A user does not need to grasp excess professional knowledge and can easily and reasonably construct the robust H-infinite controller suitable for an axial (a single degree of freedom) magnetic levitation bearing system.

The invention provides a sinking alarm system and method combining an open loop mode with a closed loop mode, and belongs to the technical field of water search and rescue. The system comprises an onboard base station and at least one mobile terminal. The onboard base station comprises a closed loop broadcaster, a driven alarm processing device, a driving alarm processing device, a base station positioning device, a base station alarm device, a shipwreck detection device and an open loop broadcaster. Each mobile terminal comprises a closed loop response device, a water-sensitive sensor, a driving alarm device, a terminal positioning device and an open loop response device. An alarm mode that the open loop mode and the closed loop mode are combined is provided, the mobile terminals falling in water are positioned, it is guaranteed that sailors can give an alarm in time when falling into water and can be rescued in time, and therefore rescue efficiency is improved, and rescue resources are saved.

The invention discloses a time-varying reliability evaluation method for an uncertain PID control system. The method is aimed at the PID closed-loop control system with interval uncertain variables. The time-varying reliability is calculated and evaluated by combining a closed-loop response interval. The method comprises the steps as follows: firstly, determining optimal PID parameters of a deterministic system when control force amplitude is the minimum with an optimization algorithm, then calculating the closed-loop response interval with interval uncertainty variables with a subinterval method, and finally, calculating the time-varying reliability in combination with the first crossing theory for reliability evaluation.

The present invention discloses a new locking judgement method for digital automatic frequency controlled loop. It includes the steps as the follows: to calculate out the average value y(k) of N numbers of input signals, to compare the sizes of input signals, to input the kept peak value into JI as jitter, to calculate out the absolute value of the difference between the present obtained peak value jitter JI and the last time obtained peak value jitter PJI and to make the comparasion between the difference absolute value and peak value threshold value. The method judges whether the loop is locked or not by counting up the curve characters of closed loop response character in loops and it does not to be influenced by the variation of inputted signal amplitude.

The invention provides a distributed driving unmanned vehicle path tracking control method and system. A transverse control scheme that deviation control is directly mapped to composite steering control quantity is adopted, which is simple and visual; the adopted combined feedback control algorithm not only can ensure the stability, the control precision and the closed loop response bandwidth of control response, but also is convenient for engineering realization and parameter adjustment; and meanwhile, the dynamic characteristics of distributed independence and controllability are brought into full play through multi-wheel independent torque distribution, composite braking and the like in the longitudinal direction. The path tracking control comprises calculation of a transverse control quantity, calculation of a longitudinal control quantity, torque distribution of the transverse / longitudinal control quantity mapped into a bottom-layer executing mechanism and composite braking torquedistribution of the transverse / longitudinal control quantity mapped into the bottom-layer executing mechanism, wherein the transverse control quantity refers to a steering angle, and the longitudinalcontrol quantity refers to a driving control quantity or a braking control quantity.