42 results about "Open-loop controller" patented technology

An apparatus for controlling the movements of an avatar in a virtual environment includes a user input means, such as a gamepad with a plurality of joystick-controlled and button-controlled outputs, a tracker, and optional sliding foot pedals; a processor for running virtual environment (VE) software that includes an avatar moving through the VE; and a control mapping algorithm. The algorithm maps the gamepad, tracker, and optional sliding foot pedal outputs to the avatar's course, heading, displacement, and view, with the joysticks mapped to provide open loop directional control over the course and heading of the avatar, the tracker providing open loop control over the view, and the optional sliding foot pedals providing open loop control over displacement. The operator-controlled movement of the avatar in the virtual environment is displayed to the operator on a computer desktop display or a head mounted display.

A flexible closed-loop controller capable of being quickly and easily configured for a broad range of applications. The controller contains a set of control elements that may be configured or reconfigured for any specific application. Built-in configuration management automates configuration of the control elements dependent on user commands or operating conditions. The controller is autonomous after initial configuration, although it may be used interactively. This flexible closed-loop controller is suitable for switching power supplies, linear amplifiers, AC inverters, battery chargers, electronic loads, temperature and pressure management, motor or actuator drives, as well as industrial automation, data acquisition, and automatic test equipment. The controller reduces development time and cost, reduces parts count and cost, and improves performance and reliability of real-time closed-loop systems.

A command current setting portion has a target value corrector that calculates d-axis and q-axis current command values idc, iqc that are to be supplied to an open-loop controller, based on d-axis and q-axis current target values id*, iq*. When d-axis and q-axis voltage target value vd*, vq* calculated from the d-axis and q-axis current target values id*, iq* by the motor circuit equations exceed a voltage limit, this target value corrector 26 corrects the d-axis and q-axis current target values id*, iq* by the field weakening control such that d-axis and q-axis voltages vd, vq and d-axis and q-axis currents id, iq satisfy √(vd2+vq2)≦Vlim and √(id2+iq2)≦Ilim respectively. The d-axis and q-axis current command values idc, iqc are obtained by this correction.

The invention discloses an open-loop fuzzy control method for a piezoelectric ceramic driver hysteresis system and relates to the field of control in super-precision optical application. The open-loop fuzzy control method solves the problems that an open-loop controller of a hysteresis model structure of an existing PZT hysteresis system is poor in adaptability and can not effectively compensate for the influence of related hysteresis characteristics on system control accuracy. The method comprises the steps of acquiring input data and output data of the piezoelectric ceramic driver system, determining membership function distribution of input variables, identifying parameters of the conclusion part of a fuzzy hysteresis model through the recursive least-squares method to obtain a hysteresis inverse model capable of being analyzed and expressed eventually, establishing an open-loop fuzzy controller according to the hysteresis inverse model and compensating for the hysteresis characteristics of the piezoelectric ceramic driver system so as to achieve accurate control over the piezoelectric ceramic driver system. The fuzzy model adopted in the method is high in modeling accuracy, high in generalization ability and capable of being analyzed and expressed reversely; the inverse model is low in computation complexity, and the hysteresis compensation open-loop fuzzy controller established according to the inverse model is easy to realize and capable of being used conveniently in real time.

A variable geometry compressor having a housing, a compressor wheel and a plurality of vanes positioned between an exducer of the compressor wheel and a housing volute. The vanes are adjustable through a range of positions, but a vane actuation system is configured to actuate the vanes through three discrete positions from among the range of positions. The actuation system has an actuator that includes an actuator housing containing a diaphragm that divides a housing chamber into two portions. Through the application of a vacuum to either chamber portion, the diaphragm drives a rod to actuate the vanes between two of the discrete vane positions, while a spring returns the vanes to the third position when no vacuum is applied. The actuator is controlled by an open-loop controller.

The invention discloses a tuning controller of a two-motor vector control frequency control system and a manufacture method thereof, including a neural net general inverse and a linear closed-loop controller, wherein a frequency converter, two induction machines and a common load are integrated to compose a two-motor vector control frequency control system; the neural net general inverse is connected at the front of the two-motor vector control frequency control system, to compound a pseudolinear system consisting of two coupled speed sub-systems and a strain sub-system; a speed controller and a strain controller constitute the closed-loop controller; the neural net general inverse and the linear closed-loop controller are connected in series to compose the neural net general inverse turning controller, to obtain excellent coordination control of the rotation speed and the strain, which not only designs the novel multi-motor vector control frequency control system, but realizes the net control with wide application foreground, convenient construction system and low cost in the old multi-AC motor system.

The invention discloses a construction method of a fuzzy neural network generalized inverse controller of a chassis nonlinear system. An active suspension system and an electric power steering system form the integrally-formed chassis nonlinear system based on vertical and transverse motions. A fuzzy neural network and five linear elements are adopted to form a fuzzy neural network generalized inverse of the chassis nonlinear system. The fuzzy neural network generalized inverse is arranged in front of the chassis nonlinear system, and a generalized pseudo-linear system is formed through composition. The generalized pseudo-linear system is decoupled into five linear one-step subsystems, poles of five linear one-step subsystems can be reasonably configured in a complex plane by reasonably adjusting parameters of the generalized inverse system, and accordingly open loop decoupling control of the chassis nonlinear system is achieved. The controller can independently serve as an open loop controller to be directly used without an additional closed loop controller, and the controller is low in cost and easy to achieve.

A control system that employs closed-loop control for providing active vehicle rear-wheel steering, where the control system receives longitudinal wheel slip inputs to improve the vehicle directional stability. The longitudinal wheel slip inputs can be from one or more of wheel speed, traction control on and automatic braking system on. The control system includes an open-loop controller for generating an open-loop steering control signal, a yaw rate feedback controller for generating a yaw rate feedback signal, and a side-slip rate controller for generating a side-slip rate feedback signal. The open-loop steering control signal, the yaw rate feedback signal and the side-slip rate feedback signal are combined to generate the steering control signal to steer the vehicle rear wheels.

A command current setting portion has a target value corrector that calculates d-axis and q-axis current command values idc, iqc that are to be supplied to an open-loop controller, based on d-axis and q-axis current target values id*, iq*. When d-axis and q-axis voltage target value vd*, vq* calculated from the d-axis and q-axis current target values id*, iq* by the motor circuit equations exceed a voltage limit, this target value corrector 26 corrects the d-axis and q-axis current target values id*, iq* by the field weakening control such that d-axis and q-axis voltages vd, vq and d-axis and q-axis currents id, iq satisfy √(vd2+vq2)≦Vlim and √(id2+iq2)≦Ilim respectively. The d-axis and q-axis current command values idc, iqc are obtained by this correction.

The invention relates to an active clearance control method and system. The method comprises the steps that the current state of an aero-engine is judged, and if the aero-engine is in a steady state, a closed-loop control process which is achieved by a closed-loop controller and based on clearance-related parameter adjustment and an actuator affecting turbine clearance is selected and used; if the aero-engine is in a transition state, an open-loop control process which is achieved by an open-loop controller and based on clearance-related parameter adjustment and the actuator is selected and used. According to the method, when the aero-engine is in the steady state, the closed-loop control process based on clearance-related parameters is adopted to ensure high control accuracy of the turbine clearance in the steady state; when the aero-engine is in the transition state, the open-loop control process based on the clearance-related parameters is adopted to make turbine clearance control respond more quickly in the transition state and avoid frequent actuation, caused by slow response, of the actuator affecting the turbine clearance; as a result, high control accuracy of the turbine clearance in the transition state is acquired, and the control effect of active clearance is improved.

The invention discloses a manufacturing method of a bearingless asynchronous motor neural network generalized inverse decoupling controller, and the manufacturing method comprises following steps that a static neural network of ten input nodes and four output nodes and six linear links are used for forming a neural network generalized inverse of four input nodes and four output nodes, the neural network generalized inverse is arranged in front of a composite controlled target to form a generalized pseudo-linear system, the generalized pseudo-linear system is decoupled and linearized into two displacement two-step pseudo-linear subsystems, one rotation speed one-step pseudo-linear subsystem and one magnetic chain one-step pseudo-linear subsystem; and the neural network generalized inverse, two Clark inverse transformers and two current tracking-type inverters collectively form the neural network generalized inverse decoupling controller, not only is the dynamic decoupling between a radial displacement system and a rotation speed system and between the radial suspension forces of the bearingless asynchronous motor realized, but also the controller can be used as a nonlinear open-loop controller to be directly used, and the stable suspension running of a bearingless asynchronous motor rotor can be guaranteed.

The invention discloses an unmanned ship navigation control method and system, a storage medium and computer equipment. According to the system, actual longitude and latitude information acquired by an attitude sensor and set longitude and latitude serve as input and are transmitted to a navigation path controller, and an LOS angle is obtained through an LOS guidance algorithm and serves as a setcourse angle to be transmitted to a course controller based on trajectory linearization. The course controller is divided into a slow loop controller and a fast loop controller. The set course angle and the actual course angle acquired by a sensor magnetic compass serve as input and are transmitted into the slow loop controller, and due to the cooperation of a first pseudo-inverse system module and a first stable regulator module of the slow loop controller, output parameters of the slow loop controller are obtained and transmitted into the fast loop controller. The actual rudder angle obtained by a rudder angle detection device serves as input and is transmitted into the fast loop controller, and by means of a second pseudo-inverse system module and a second stable regulator module of thefast loop controller, fast loop control input is obtained and acts on a stern machine propelling device of an unmanned ship so that the purpose of indirectly achieving navigation path control can beachieved by controlling the course.

The invention discloses a simulated turntable control system based on fuzzy self-adaptive PID control. The system is composed of a measurement and control unit, an execution unit and a feedback unit.The measurement and control unit is connected to a simulated turntable by the execution unit and includes a DSP motion control card; the DSP motion control card is connected with the simulated turntable by the execution unit; and the simulated turntable is connected with a controller by the feedback unit. The feedback unit consists of a speed feedback device and a position feedback device; the speed feedback device includes a speed loop and a speed loop controller; the speed loop controller uses a PI controller; and the position feedback device consists of a position loop and a position loop controller, and the position loop controller uses a fuzzy adaptive PID controller including a PID controller and a fuzzy controller. The simulated turntable control system has simple structure; and theoperation of the simulated turntable is controlled by the measurement and control unit, the execution unit and the feedback unit, so that the stability of the operation of the simulated turntable isimproved and the simulated turntable is able to work stably.

The invention discloses an externally controlled two-position two-way pilot type proportional valve which is applicable to a hydraulic control system. The externally controlled two-position two-way pilot type proportional valve is characterized in that a main valve is provided with three oil ports; the displacement of a main valve core is controlled by pressure oil from the control oil port; when the flow of oil passing through an oil groove of the main valve core is consistent with the flow of oil passing through the pilot type proportional valve, the opening degree of one working oil port reaches a stable state; an electronic switch is arranged between an open loop controller and a feedback signal controller and is controlled by a pilot displacement sensor or a main valve displacement sensor; the control oil port is connected with a constant-pressure source; the dynamic characteristic of the main valve is not affected by the pressures of the working oil ports of the main valve; the low-pressure controllability, the high-pressure stability and the dynamic characteristic of the valve are improved; and oil is piloted back into an oil tank, so that the power of a pilot level is reduced. The externally controlled two-position two-way pilot type proportional valve is simple in structure, easy to popularize and apply, and applicable to the hydraulic control system.

The invention discloses a dynamic negative-pressure servo control system and method based on symmetric air cylinders, and belongs to the field of air pressure simulation of high-altitude vehicles. Thedynamic negative-pressure servo control system comprises an electromechanical transmission module, a pneumatic module, a control module and a data collection module. The electromechanical transmission module adopts a motor direct drive mode, makes a servo motor directly connected with a ball screw, the pneumatic module utilizes the symmetric negative-pressure air cylinders as pressure generators,the control module is used for controlling and switching different pressure input signals and pressure open loop controllers, and the data collection module collects pressure of controlled cavities of the negative-pressure air cylinders and displacement of cylinder pistons through pressure sensors and displacement sensors and transmits the pressure of the controlled cavities of the negative-pressure air cylinders and the displacement of the cylinder pistons to an industrial personal computer. The invention further discloses a dynamic negative-pressure servo control method based on the symmetric air cylinders. By the adoption of the dynamic negative-pressure servo control method, dynamic negative-pressure servo control is achieved rapidly and accurately, meanwhile, the dynamic negative-pressure servo control device has the advantages of being simple in structure and easy to implement, and is particularly suitable for air pressure simulation equipment for spacecraft.

An air-fuel ratio control device has an open loop controller which controls an air-fuel ratio to be a target air-fuel ratio, a feedback controller that shifts the target air-fuel ratio to a logical air-fuel ratio, and feedback controls the air-fuel ratio to be the logical air-fuel ratio by using a feedback correction coefficient determined based on an output of an O2 sensor, an average value calculator that calculates an average value of the feedback correction coefficient when the output of the O2 sensor reverses from a lean side to a rich side and from the rich side to the lean side in a feedback control by the feedback controller, and a learned value calculator that calculates a learned value based on the average value at a time when the average value calculated by the average value calculator becomes substantially constant.

The invention discloses an analog turntable control system based on neural network PID control. The system is composed of a measurement and control unit, an execution unit and a feedback unit. The measurement and control unit connected to an analog turntable by the execution unit consists of a DSP motion control card connected to the analog turntable by the execution unit; and the analog turntableis connected with a controller by the feedback unit. The feedback unit includes a speed feedback device and a position feedback device; the speed feedback device includes a speed loop and a speed loop controller and the speed loop controller employs a PI controller; the position feedback device includes a position loop and a position loop controller; the position loop controller employs a fuzzy neural network PID controller including a PID controller and a fuzzy neural network. The analog turntable control system has a simple structure; with the measurement and control unit, the execution unit and the feedback unit, the operation of the analog turntable is controlled, so that the stability of operation of the analog turntable is improved and thus the analog turntable is able to work stably.

A method and device for controlling an internal combustion engine, in which the fuel quantity to be injected into the engine is limited to a limiting value. The limiting value is predefined on the basis of the output signal of a closed-loop controller or an open-loop controller and a precontrol value. Furthermore, the precontrol value is corrected.

A method and device for controlling an internal combustion engine, in which the fuel quantity to be injected into the engine is limited to a limiting value. The limiting value is predefined on the basis of the output signal of a closed-loop controller or an open-loop controller and a precontrol value. Furthermore, the precontrol value is corrected.

A system for online filtering of photovoltaic (PV) output signals includes a programmable filter that is programmed to decompose measured PV output power into an estimated low-frequency signal component, based substantially on movement of the sun and an estimated high-frequency signal component, based substantially on cloud shading. An open loop controller generates a reactive power compensation signal based on at least one of the low-frequency signal component and the high-frequency signal component. The low-frequency signal component is defined by a positive portion of a sine curve that is based substantially on movement of the sun.

The invention discloses a dynamic performance analysis method for a parallel connection mechanism, and belongs to the technical field of electromechanical integration. The method includes steps: firstly establishing a dynamical model of the parallel connection mechanism in a joint space, and calculating a maximum load inertia of a driving shaft; establishing a double-inertia control system of thedriving shaft of the parallel connection mechanism, and obtaining an angular velocity transmission relation and an angular position transmission relation; further selecting a proper total damping ratio for the double-inertia control system, and determining control parameters of a speed loop controller and a position loop controller; and finally calculating changes of a first damping ratio and a second damping ratio and changes of a first natural frequency and a second natural frequency of the double-inertia control system to explain the dynamic performance change of the parallel connection mechanism. According to the method, an effective tool is provided for analysis of the dynamic performance of the parallel connection mechanism which is a complicated electromechanical integration device.

The invention provides an FPGA-based converter closed-loop controller. Based on the characteristics of high-speed processing capability, parallel execution, flexible programming and the like of the FPGA, closed-loop control of the converter is realized; the FPGA adopts a given signal configured in the interior for the closed-loop controller; then, an off-chip AD chip is adopted for high-frequency sampling conversion to be used as a feedback signal and protection judgment for the closed-loop controller; and next, a modulation signal of the converter is calculated and updated in real time, so that constant output voltage or current of the converter can be ensured no matter how a three-phase load capacity changes. The FPGA-based converter closed-loop controller has the advantages of high integration degree, low cost, flexible control algorithm and the like.

The invention relates to a fast erection control system which comprises an oil supply unit, multiple stages of hydraulic cylinders, a plurality of auxiliary power branches and a main power branch, andthe auxiliary power branches and the main power branch are connected in parallel. A switching sensor, an open loop controller, a closed loop controller and a switching controller are included; each stage of hydraulic cylinder of the multiple stages of hydraulic cylinders communicates with the oil supply unit through the main power branch and one of the auxiliary power branches, and extends out step by step to complete erection of an erection arm; the switching sensor is used for monitoring the erection state of the erection arm to feed back the erection state to the switching controller in real time; the open loop controller and the closed loop controller are connected in parallel to be then connected with the switching controller in series; and the switching controller is used for selecting parameters according to the erection state of the erection arm to adjust the control state of the main power branch. The fast erection control system solves the problem that the fast erection system based on an energy accumulator type auxiliary power source is large in pressure fluctuation and long in stabilization time in the erection process.