395 results about "Integral controller" patented technology

A motor control device capable of suitably inhibiting the pulsating torque of an alternating-current motor is provided. The motor control device comprises an axis error inference machine (30) which infers an axis error based on a current value of an inverter, detected by a current sensor (2); a Fourier rectification machine (316a) which extracts an axis error vector from the time-base changes of the axis error; an integral control machine (316b) additionally provided with a circular amplitude limiter, which is used to calculate a correction current vector for offsetting the pulsating torque, wherein a circle with a set amplitude limiting value serving as the radius is used as the base for limiting the movement of the correction current vector, and the integral control machine (316b) additionally provided with the circular amplitude limiter performs the circular amplitude limiting for limiting the movement of the correction current vector so as to enable the deflection angle of the correction current vector to be close to the deflection angle of the axis error vector.

A remotely adjustable lighting device configured to an operational mode customized for the geographic location of the device. The lighting device is powered by a battery provided with solar charging. The lighting device, under control of an integral controller, is turned off and on for an illumination period as a function of both local sunrise and sunset times determined by a combination of time and date information and GPS positioning. The luminosity of the lighting device is autonomously controlled as a function of battery charge and the determined required illumination period. The solar charging system is oriented by the controller to optimize its energy collection by periodical adjustments.

Method and apparatus for the treatment of cardiac failure, Cheyne Stokes breathing or central sleep apnea are disclosed. A subject is provided with ventilatory support, for example positive pressure ventilatory support using a blower and mask. Respiratory airflow is determined. From the respiratory airflow are derived a measure of instantaneous ventilation (for example half the absolute value of the respiratory airflow) and a measure of longterm average ventilation (for example the instantaneous ventilation low pass filtered with a 100 second time constant). A target ventilation is taken as 95% of the longterm average ventilation. The instantaneous ventilation is fed as the input signal to a clipped integral controller, with the target ventilation as the reference signal. The output of the controller determines the degree of ventilatory support. Clipping is typically to between half and double the degree of support that would do all the respirator work. A third measure of ventilation, for example instantaneous ventilation low pass filtered with a time constant of 5 seconds, is calculated. Ventilatory support is in phase with the subject's respiratory airflow to the fuzzy extent that this ventilation is above target, and at a preset rate conversely.

A portable active fluid-powered ankle foot orthosis. A lower leg mount and a foot bed are pivotally coupled at or proximate to an ankle position. A fluid powered rotary actuator is configured to receive power from a wearable fluid power source and provide controlled force and resistance to aid or inhibit relative rotation of the foot bed and the lower leg mount. An integral controller is provided for receiving data from sensors and controlling the fluid powered rotary actuator to actively assist gait of a user.

A DC motor having a motor housing and a motor controller housed within the motor housing. In a preferred embodiment the heat producing components of the motor controller are in thermal communication with the housing such that the majority of the heat produced by such components will be readily conducted to the environment in which the motor is operating. When incorporated into a trolling motor, the motor housing of the present invention will be submerged so that controller produced heat will be dissipated into the water in which the trolling motor is operated.

What is disclosed is an image processing method to reduce streaking on a printed sheet. The method uses a negative feedback system to reduce streaking. The feedback system consists of a scanner that scans a printed sheet corrected with an error signal. The error signal is obtained from the scanned image of a previous print off the same printer and the desired output. There are a number of error signals in different positions across the process direction which adjust TRC values. The present invention makes use of a spatial filter representing the spatial frequency sensitivity of the human eye such that only differences (errors) of importance in need of correction are those which can be seen by the human eye. More specifically, a spatially distributed controller is utilized to improve sensitivity to measurement and printer noise. The printer adjusts the incoming bitmap so that each column in the image gives the same response for the same gray level. The printer sacrifices the uniformity of the responses at low and high frequencies where the eye is not responsive so that it can achieve better control at mid-frequencies where the eye is more responsive. At each iteration and for a fixed desired gray-level, the controller processes differences between desired output gray-levels and the values of the gray-levels obtained on the printed output image. A spatial filter is used to emphasize ranges of spatial frequencies critical for a human observer. Then, from these filtered differences (errors), TRC corrections to be applied to the output image are computed using simple scalar integral controllers. Advantageously, since the present invention compensates for defects introduced by lower quality components in a printer, printers can be less tightly specified.

The invention discloses a ramp parking control method and system of an electric vehicle and the electric vehicle with the system. The method comprises the steps that when the electric vehicle is started and stopped at a ramp, a vehicle controller collects various signals of the electric vehicle, generates various instructions according to the collected signals and sends the instructions to a motor controller; the motor controller collects various information of a motor and estimates output torque needed by the motor when the electric vehicle is parked at the ramp according to the collected information; the motor controller judges whether the motor meets the condition of entering a zero-rotating speed control mode or not according to the instructions sent by the vehicle controller and the current state of the motor; if yes, the motor controller takes the estimated torque as an initial output torque command; torque needed by the motor when the electric vehicle is parked at the ramp is regulated through a proportional integral controller, and according to commanded torque, the motor is controlled to perform torque output, and the rotating speed of the motor is regulated to zero. According to the method, the vehicle ramp starting and stopping safety and the driving comfort can be improved.

The invention discloses a method for realizing a network access current of a unity power factor of a grid-connected inverter and internal anti-islanding, which belongs to control technology of inverters. The method comprises the following steps: phase difference detection, frequency droop calculation, reference current generation, grid voltage feed-forward and a proportional integral controller. A frequency droop algorithm comprises the following steps: performing real-time calculation on a phase difference between the network access current and a grid voltage; multiplying the phase difference by a droop coefficient to obtain a frequency variable quantity; and subtracting the frequency variable quantity from a previous frequency output quantity of the last frequency droop algorithm so as to obtain an output quantity of a new frequency droop algorithm. The method realizes phase control of the network access current of the grid-connected inverter, realizes the network access current of the unity power factor, and internally realizes an anti-islanding measure of frequency drift positive feedback of the grid-connected inverter at the same time. Therefore, the method is of a simple and effective realizing mode.

The present invention discloses an adjustable advanced observation device. The device comprises a subtractor, a high-gain proportion-integral controller, an inertia combination filter, a first-order inertia filter, a first proportion unit, a second proportion unit and an addition unit. The adjustable advanced observation device can solve the technical problems that a current low-order observationdevice is low in efficiency, namely low in the advanced phase peak, and low in the ratio of the advanced phase peak and the gain peak.

The invention provides an advanced observation method and device. Advanced observation measured time, inertia combination filters, high gain ratio-integral controllers, 1-order inertia filters and a subtraction unit are arranged. An input signal accesses a subtracted input end of the subtraction unit, and the input signal is a process signal requiring advanced observation. An output end of the subtraction unit is connected to the input end of each high gain ratio-integral controller. The output end of each high gain ratio-integral controller is connected to the input end of each inertial combination filter. The output end of each inertial combination filter is connected to a subtraction input end of the subtraction unit, and the output end of each high gain ratio-integral controller is connected to the input end of each 1-order inertial filter. Advanced observation output of the input signal is acquired on the output end of each 1-order inertial filter. An advanced phase peak value ishigh and a ratio of the advanced phase peak value and a gain peak value is high too.

An apparatus and method is provided for tuning a controller parameter of a PIV controller with a position, velocity and/or integral controller element for a control path of a drive in an electroerosion apparatus, with the help of a fuzzy controller, wherein for the purpose of tuning, a preset control input distribution, such as a time-dependent distribution of the position of the drive, is provided to the PIV controller as input variable and wherein an input variable of the fuzzy controller is derived from the control variable of the controller. Additional input variables of the fuzzy controller are derived from a controller output of the PIV controller.

The invention discloses an impedance self-adapting motion control method based on a rehabilitation training robot. The method is characterized in that: an online recognizer calculates an equivalent quality parameter Mh, an equivalent damping parameter Bh and an equivalent rigidity parameter Kh of a limb according to acting force and position of the limb collected by a force sensor and a position sensor, and corrects a proportional factor KP, an integral coefficient KI and a differential coefficient KD of a proportional-differential-integral controller according to the variation of the parameters; and a motor power signal output by the proportional-differential-integral controller is converted into a driving signal of a torque motor for controlling the work of the torque motor. According to the control method, the control flexibility and safety of the rehabilitation training robot can be improved.

The invention discloses a method for controlling vibration of a flexible manipulator based on a vibration observer. The method comprises the following steps: 1, establishing a mathematic model of a flexible manipulator system and acquiring model information of the system; 2, designing the vibration observer; 3, designing a state feedback integral controller; 4, adjusting control parameters according to the combined simulation effect; 5, ending the design. When the residual vibration of the tail end of the flexible manipulator is tested and controlled, a vibration signal of the tail end of the flexible manipulator can be obtained without using a sensor in an existing method, the system structure is simplified, and the cost is saved. The state feedback controller with an integral is used at the same time, and unbiased tracked and specified input can be achieved while the dynamic characteristics of the system are effectively adjusted.

The invention discloses a control system for restraining three-phase output voltage of an uninterruptible power supply (UPS) from disequilibrium and harmonic wave. Imbalance output voltage is decomposed to be a positive-sequence component, a negative-sequence component and a zero-sequence component, which pass three groups of PI controllers; the first group of PI controllers primarily controls the output voltage by a proportional controller P under Clarke coordinate to calculate margin of error; the second group of PI controllers adjusts the positive-sequence component by an integral controller I in a positive rotary coordinate system; and the third group of PI controllers restrains the negative sequence by an integral controller in a contra-rotation coordinate system; if the negative sequence is restrained 5 times and the harmonic wave is restrained 7 times, PI control is respectively carried in a reverse 5 times based wave angular velocity rotary coordinate system and a forward 7 times based wave angular velocity rotary coordinate system. Three-phase balance output voltage can be acquired after summing up the output of the five groups of PI controllers, and carrying out the space vector modulation, thus harmonic distortion is greatly reduced.

The invention discloses an adaptive inverse control system for a chemical-mechanical polishing machine, which comprises a target pressure input device used for inputting target pressure of a polishing head chamber to a compound control device, a neural network identification device used for identifying a control model of a system based on the input pressure of the polishing head chamber input by the compound control device and the pressure output by the polishing head chamber, and the compound control device used for outputting the input pressure of the polishing head chamber based on the target pressure, the pressure output by the polishing head chamber and the control model. Each compound control unit comprises a neural network controller used for calculating neural network controlled quantity, a proportional integral controller used for generating proportional integral controlled quantity and a weighting device used for generating the input pressure of the polishing head chamber for the neural network controlled quantity and the proportional integral controlled quantity with the subsection variable-parameter control strategy. The adaptive inverse control system for the chemical-mechanical polishing machine is capable of reducing coupling among areas of the polishing head chamber through dynamic on-line decoupling of neurons.

A capnograph system sensor head includes an airway adapter, a housing for receiving the airway adapter, a source of infrared radiation coupled to the housing for directing infrared radiation through the airway adapter, and a detector subsystem coupled to the housing and responsive to the infrared radiation after it passes through the airway adapter for providing an analog output. A circuit sub-assembly is integrated with the sensor head and includes a controller responsive to the analog output of the detector subsystem. The controller is configured to adjust the gain of the detector subsystem to output a digital signal representative of the amount of a particular gas flowing through the airway adapter.

An embodiment of the invention provides a method for implementing shifting impact of an electric vehicle and a shifting control device. The method includes enabling an integral controller of the electric vehicle to judge whether a clutch of the electric vehicle is switched off or the electric vehicle is in a neutral state, and then determining target rotational speed values of a motor according to the opening of an accelerator pedal of the electric vehicle; enabling the integral controller to transmit motor rotational speed instructions to a motor controller, and enabling the motor controller to adjust the rotational speeds of the motor according to the rotational speed values in the motor rotational speed instructions; representing the shifting impact by sudden change of the speeds of transmission shafts on two sides of the clutch when the clutch of the electric vehicle is switched on and then the rotational speeds of the motor are not matched with the current vehicle speeds of the electric vehicle. The rotational speed values are carried in the motor rotational speed instructions. The method and the shifting control device have the advantages that change trend of the rotational speeds of an engine is simulated, so that real shifting sensation of the electric vehicle can be created according to torque output of the motor in speed modes; change of the rotational speeds of the motor is intensified along with increase of the matching difference between the rotational speeds of the motor and the vehicle speeds during shifting, and accordingly the shifting impact of the electric vehicle can be effectively implemented.

The invention relates to a multi-phase induction motor-specific subharmonic current suppression method, which includes the following steps: (A) current reference value processing; (B) current feedback value processing; (C) current regulation; (D) voltage reference value determination. Based on the vector control of a multi-phase induction motor, the method maps the current of the multi-phase motor into a corresponding synchronous rotating reference frame of a fundamental wave and each subharmonic orthogonal to each other by multiple synchronous rotating coordinate transformations, and uses proportional-integral controllers to respectively carry out tracking with zero steady-state error and combine to form an integral current controller. The method has the advantages that trapezoidal integration is adopted to increase integral accuracy, and supplemented by variable structure control, appropriate self-adaptive compensation is introduced to resist control saturation, so that static and dynamic performance is further enhanced; the method can suppress motor loss caused by the harmful subharmonic current of the multi-phase motor and the adverse affection of torque ripple, vibration noise and the like, and can utilize the positive effect of usable subharmonic; the method takes full advantage of the multi-phase motor, and enhances system performance.