85results about How to "Weakened control" patented technology

A motor drive control apparatus for controlling a motor has a main control part that performs a flux weakening control by a vector control of d-q axes and a rate-limit control part that controls a rate of change in a d axis current command value in the vector control. Further, there is provided a motor control apparatus for controlling a motor has a motor angular speed detection part that detects a motor angular speed of the motor and a motor control part having a current control system that controls the electric motor based on a motor current and a current command value. The motor control part calculate the current command value in which torque becomes constant by considering characteristics of the current control system based on a motor angular speed detected by the motor angular speed detection part.

A lane deviation avoidance system is arranged to execute a lane deviation avoidance control of controlling a vehicle behavior of the host vehicle so as to avoid the host vehicle from deviating from a traveling lane when the lane deviation tendency is detected, to suppress the driving force when the lane deviation tendency is detected, and to set a controlled variable of the lane deviation avoidance control according to a degree of the suppression of the driving force.

The invention discloses an inner and outer layer nesting ECMS (equivalent fuel consumption minimization strategy) multi-objective double-layer optimization method. The inner and outer layer nesting ECMS multi-objective double-layer optimization method includes steps of building multi-objective optimization models of plug-in hybrid electric vehicles; solving the multi-objective optimization modelsby the aid of inner and outer layer nesting multi-objective particle swarm algorithms to obtain multi-objective optimized Pareto solution set front edges; weighting equivalent fuel consumption per hundred kilometers and variation ranges of deviation of SOC (state of charge) final values and target values, building total evaluation functions related to the equivalent fuel consumption per hundred kilometers and SOC deviation and selecting the optimal charge and discharge equivalent factors and engine and motor power distribution modes corresponding to the optimal charge and discharge equivalentfactors. The inner and outer layer nesting ECMS multi-objective double-layer optimization method has the advantages that output power of engines and motors of the plug-in hybrid electric vehicles canbe reasonably distributed at CS (charge sustaining) stages, so that fuel consumption can be reduced as much as possible, battery SOC balance still can be effectively kept, and the fuel economy of theintegral vehicles can be improved.

The invention discloses a lithium ion storage battery charging method based on sequential shunt switching regulation (S3R). Based on an original S3R system battery charging control regulator (BCR) constant current charging, the lithium ion storage battery charging method based on S3R improves a constant-pressure charging standard, and can introduce directly a part of solar battery arrays for charging of a storage battery in order to solve the problem of heavy-current charging. When heavy-current charging is needed, the directly introduced solar battery arrays and a BCR are combined to form a heavy and constant-current charging mode, wherein the BCR is utilized for accurate adjustment of charging current intensity. When charging develops to a constant voltage stage, a BEA replaces D / A control to convert the BCR to constant voltage control so that a charging current decreases gradually. When heavy-current charging is not needed, a rapid charging array is switched off by a BEA control signal. When a detection result shows that a solar cell array current is surplus and a charging current is less than a certain value, the storage battery is full and D / A output is stopped so that charging is finished. The lithium ion storage battery charging method based on S3R can satisfy the requirements of heavy-current, constant-current and constant-voltage charging control of Leo satellite lithium ion storage batteries.

A method of frame-layer rate control in a video encoder includes allocating a target characteristic for a current frame, performing a first encoding stage for encoding macroblocks of the current frame by utilizing a first quantization parameter to thereby generate a residual signal and an actual characteristic for the current frame corresponding to being encoded according to the first quantization parameter, and testing whether or not the actual characteristic for the current frame corresponding to being encoded with the first quantization parameter is within a predetermined range of the target characteristic for the current frame.

A voltage detection section and current detection section detect a voltage and current supplied to a motor, and the detected voltage and current are supplied to a position detection section. An angular speed output from the position detection section is supplied to a differentiator to output an angular acceleration. A fundamental wave component extraction section extracts a fundamental wave component of the angular acceleration, and the extracted fundamental wave component is supplied to an amplitude adjustment section. The output of the amplitude adjustment section is subtracted from the average current command by a subtraction section. This subtraction result, current detection value, and the rotor position from the position detection section are supplied to a current control section to carry out the current control operation so as to obtain a current command. The current command is supplied to an inverter to control the voltage and current so as to suppress the speed changing due to the load torque changing. Thus, stability is improved, and a decrease in cost is realized.

A control apparatus for an AC rotating machine that can reliably and stably start up an AC rotating machine, particularly a synchronous motor using a permanent magnet, in position-sensorless vector control thereof, includes: a steady speed calculator that calculates, during steady state control of the AC rotating machine, a rotation angular frequency of the AC rotating machine based on an AC current and voltage commands; and a start-up speed calculator that calculates, during start-up control within a predetermined period after the AC rotating machine has been started up, the rotation angular frequency of the AC rotating machine based on the AC current and the voltage commands. The control apparatus corrects during the start-up control current commands so that the AC voltage amplitude of the voltage commands will be a constant value not more than the maximum output voltage of a power converter.

A controller for a motor carries out field weakening control by using a simple construction to change the phase difference between two rotors, which are disposed around a rotating shaft, without depending on the number of revolutions of a motor. The controller for a motor includes a field weakening current calculator for calculating a field weakening current command value on the basis of the radius of a target voltage circle, a d-axis voltage command value, and a q-axis voltage command value, a rotor phase difference command value determiner for determining a command value of a rotor phase difference on the basis of the field weakening current command value, and a current command value determiner for determining a d-axis current command value and a q-axis current command value on the basis of the rotor phase difference command value and a torque command value.

The invention discloses a static switch and a control method applied to a connection of a microgrid and a public supply network. The static switch and the control method applied to the connection of the microgrid and the public supply network are characterized by comprising a main circuit and a controller, wherein the main circuit is placed between the public supply network and the microgrid, the controller controls the main circuit to turn on and turn off, and on-grid and off-grid of the microgrid are achieved through the power on and power off of the main circuit. Voltage, frequency and phase position of the public supply network and the microgrid and currents flowing past a bypass circuit are sampled by the controller to acquire a sampling signal, the power on or power off of the instruct main circuit are judged to achieve the on-grid and off-grid of the microgrid through calculation. According to the static switch and the control method applied to the connection of the microgrid and the public supply network, full automatic control on the smooth on-grid and off-grid of the microgrid is achieved, a micro source inverter of the microgrid can be monitored and controlled by the controller, and the purpose of energy management of the microgrid or assisting an upper level device to achieve energy management of the microgrid is achieved.

Speed-regulated amortisseur for turning quality belongs to field of antiknock and reducing cataclysm. The existing TMD has problems of slow enabling and bad controlling effects under frequency disturbance. Its technical route is: TMD can attain the needed motion amplitude quickly by giving impulse to its quality block, which can improve its controlling effect for percussion load. Magnetic rheostat can be used to lock functions of TMD and major structure, adjust displacement relation of TMD and structure and reduce depression of controlling effect caused by frequency disturbance. The controlling effect of the invention acted by percussion load under the condition of reduce depression is batter than that of traditional passive TMD. It has on energy problem resolved difficultly by active control while great shaking. The invention is easy to realize and has low cost.

The invention relates to a thrust allocation method and device for a miniature underwater robot vector layout thruster. The method comprises the following steps of: taking a thrust allocation energy consumption matrix of the vector layout thruster as a basis for calculating thrust; calculating a thrust allocation result with the minimum energy consumption through a extreme value theory; removing abnormal data through a peak value removal method and obtaining a control voltage for the thruster in a normal range; and converting the allocation result obtained through calculating into an actual control voltage by a thrust / voltage conversion method. The device comprises a control signal generation unit, a microcontroller and a voltage output unit; the control signal generation unit generates a voltage control signal and outputs the voltage control signal to the microcontroller; the microcontroller processes the voltage control signal, generates an actual voltage control signal, and outputs the actual voltage control signal to the voltage output unit; and the voltage output unit applies the actual voltage control signal to the robot vector layout thruster. With the adoption of the thrust allocation method and device for the miniature underwater robot vector layout thruster, the safe operation of a system is ensured, and the energy consumption of the system can be effectively lowered under the condition that the control effect is ensured.

The invention proposes a distributed photovoltaic power generation system control strategy based on a virtual synchronous generator, belongs to the technical field of distribution photovoltaic power generation control, and particularly relates to the distributed photovoltaic power generation system control strategy based on the virtual synchronous generator. The invention provides the distributed photovoltaic power generation system control strategy based on the virtual synchronous generator, which can be used for effectively preventing power fluctuation of the system during the dynamic transition process. The distributed photovoltaic power generation system control strategy comprises a photovoltaic array, a power electronic convertor circuit, a power frequency controller, an excitation controller, a virtual synchronous power generator body control link with feed-forward compensation and a sinusoidal pulse width modulation (SPWM) trigger pulse generation device, wherein the structural key lies in that an output end of the photovoltaic array is connected with an input end of the power electronic convertor circuit, and an output end of the power electronic circuit is connected with an AC bus, a signal input end of the power frequency controller, a signal input end of the excitation controller and a signal input end of the virtual synchronous power generator body control link with the feed-forward compensation.

A driving-force distribution control device includes a distributing mechanism, a distribution controller, an anti-skid brake system, an acceleration detector, a synthesized acceleration calculator and a control coefficient controller. The distributing mechanism is operable to variably distribute a driving force from an engine to individual drive wheels of a vehicle. The distribution controller is operable to control the distributing mechanism based on a running state of the vehicle. The acceleration detector is operable to detect a first acceleration in a front-rear direction and a second acceleration in a left-right direction of the vehicle. The synthesized acceleration calculator is operable to calculate a synthesized acceleration of the first acceleration and the second acceleration. The control coefficient controller is operable to indiscretely vary control coefficients for restricting the control of the distribution controller when the anti-skid brake system is activated, according to the calculated synthesized acceleration.

Disclosed is a data storage device, a servo control method, and a program to reduce effects of a resonance frequency of an actuator or the like without reduction in servo control performance. A band-pass filter comprising a first all pass filter (APF) and a second adder, a second APF, and a multiplier are used to detect how much a current resonance frequency of the actuator deviates from a set value of a center frequency of the first APF, and based on a result of the detection, the center frequency of the first APF is properly adjusted. The adjustment of the center frequency of first APF enables a center frequency of a notch filter comprising the first APF and a first adder to be automatically approximated to a current resonance frequency of the actuator.

An electrically operated drive controller includes first and second electric current command value calculation means which calculate first and second electric current command values based on a target value of torque of an electrically operated machine. The controller also includes a voltage command value calculation processing means which calculates a voltage command value based on the first and second electric current command values and an adjusting value calculation processing means for calculating an adjusting value of the first electric current command value and for performing weak field control based on the voltage command value. The first electric current command value calculation processing means adjusts the first electric current command value based on the adjusting value. The second electric current command value calculation processing means adjusts the second electric current command value based on the adjusted first electric current command value.

The invention discloses a sewage treatment control method based on sequential clusters. The method includes the steps that control time periods are divided for changing conditions of sewage inlet quality and amount in a self-adaptive mode by the adoption of the sequential sample clusters; water outlet quality, aeration energy consumption and pumping energy consumption are considered comprehensively, the optimal set values of the concentration of dissolved oxygen in an aerobiotic pool and the concentration of nitrate nitrogen in an oxygen deficiency pool at each period are determined by the adoption of an artificial immune algorithm with a global searching ability, and the oxygen transfer coefficient and inner reflux quantity are adjusted in real time for a sewage system at different periods. According to the sewage treatment control method, operation energy consumption for sewage treatment is reduced on the premise of ensuring the water outlet quality.

On an active noise controller, an adjustment reference signal generator generates an adjustment reference signal Sra by reading the waveform data sequentially at a read location shifted by a given amount from a read location for a reference signal Sr with respect to the waveform data at a reference signal generator. A one-tap adaptive filter generates a control signal Scp by multiplying the adjustment reference signal Sra by a filter factor W. A gain controller outputs a compensation control signal Sca generated by multiplying the control signal Scp by gain G. A speaker outputs the compensation control signal Sca as a cancellation sound.

A battery forklift truck using a permanent magnet type synchronous motor, wherein the permanent magnet type synchronous motor for load handling is installed separately from a traveling motor driving wheels. The maximum rotational speed of the motor for load handling is set lower than that of the traveling motor to eliminate the need of field weakening control in a high rotational speed range so that the efficiency of the motor in load handling can be increased.

An electric motor control device includes: a motor constant generator configured to generate a motor constant by using a temperature; a current control unit configured to generate a current command value to an electric motor based on the motor constant and a torque command value and execute a current control mode; a voltage phase control unit configured to calculate a torque estimation value of the electric motor and execute a voltage phase control mode in which a feedback operation is performed for a voltage phase based on the difference between the torque estimation value and the torque command value; and a control mode switching unit configured to switch to the voltage phase control mode in a high rotation area where a flux weakening control is performed. The torque estimation value is calculated using the motor constant common to generation of the current command value in the current control mode.

The invention discloses a man-machine co-driving transverse control method with a conflict resolution function. The man-machine co-driving transverse control method comprises the steps of 1, establishing a vehicle-road model based on man-machine steering torque coupling; 2, establishing a vehicle track following controller based on a man-machine game; 3, establishing a man-machine conflict indicator; and 4, establishing a control right dynamic adjustment method; the method has the beneficial effects that vehicle transverse control in a moment coupling state of a driver and a machine system is realized; and the control weights of the two are adjusted in real time. Along with the improvement of the confrontation degree, the control right is gradually transferred to one side of the driver, the control effect of the machine system is reduced, the driver is ensured to enjoy the highest vehicle control right, and the conflict is eliminated.

The present invention provides an optical disk drive that performs a stable lock operation with a small number of components at the time of the insertion of a tray. The optical disk drive has a locking mechanism which engages the inserted tray with the chassis, a reset arm provided in the tray to return the locking mechanism to the initial state, and an engaging boss that is provided in the chassis and is engaged with the reset arm. The tray has a projecting portion for controlling the engagement position between the reset arm and the engaging boss. The projecting portion comes into contact with a back surface of the engaging boss, to control the engaging amount between the reset arm and the engaging boss to be constant.

A vehicle control system includes: a turning device that turns a wheel of a vehicle; a steering sensor that detects a driver's steering operation; and a control device configured to execute automated turning control that controls the turning device to automatically turn the wheel, independently of the driver's steering operation. A modification desire degree represents a degree to which the driver's steering operation modifies vehicle travel caused by the automated turning control. During execution of the automated turning control, the control device calculates the modification desire degree based on a result of detection by the steering sensor. When the modification desire degree exceeds a threshold, the control device executes system suppression processing without terminating the automated turning control. In the system suppression processing, the control device weakens the automated turning control as compared to a case where the modification desire degree is equal to or lower than the threshold.

The invention provides a method for managing and controlling weeds of an orchard in South China. The method comprises the following steps: (1) spermacoce latifolia seeds are uniformly spread in the orchard; after the weather becomes warm and the seeds are germinated, a spermacoce latifolia population is established; (2) after the spermacoce latifolia population is established, spermacoce latifolianormally flowers and bears fruits; after the spermacoce latifolia is withered, seeds falling into oil are germinated again in the next year to form a dominant population; a process goes full circle to realize a continuous inhibition effect on the growth of the weeds of the orchard. According to the method for managing and controlling the weeds of the orchard in South China, provided by the invention, sod cultivation is carried out by utilizing the spermacoce latifolia which is shallow in root system distribution and strong in invading capability and can easily form a high-density grass cluster; the aim of inhibiting the weeds is realized through competing for ecological niches; the problem of preventing and controlling the weeds of the orchard in a production process of pollution-free fruits under different site conditions in South China is solved.