69 results about "Closed loop response" patented technology

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 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.

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.

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 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.