698 results about "Feedback regulation" patented technology

A thermally-assisted magnetic recording head is provided, in which the light-source output can be adjusted according to its variation by environmental influences and over time. The head comprises: a light source; a write head element provided in a element-integration surface; an optical system provided in the element-integration surface and configured to guide a light emitted from the light source to the vicinity of one end of the write head element; and a light detector for monitoring the light-source output, provided in the element-integration surface and comprising a light-receiving surface covering an area directly above at least a portion of the optical system. This light detector with such a light-receiving surface can detect a leakage light emitted from the optical system as a monitoring light. Therefore, feedback adjustment of the light-source output can be realized to stabilize the intensity of light for thermal-assist applied to a magnetic recording medium.

A jetting system has a jetting dispenser mounted for relative motion with respect to a plasma panel. A control is operable to cause the jetting dispenser to jet a phosphor droplet that is applied to a cell of the panel. A feedback signal indicative of the placement and size of the dot is communicated to a control. The size, velocity offset and/or placement of subsequently applied phosphor dots is controlled by heating and cooling, or adjusting a piston stroke in the jetting dispenser in response to the feedback.

The invention discloses an overrunning virtual synchronous generator (VSG+) method with rotary inertia and damping self-optimization-trending. The method comprises the following steps: step one, a mechanical equation and an electromagnetic equation of a virtual synchronous generator (VSG) are established; step two, the rotary inertia J and damping D in a VSG model are increased as |delta f| is increased, wherein delta f is an absolute value of a difference between a power network rated frequency and the actual frequency of the VSG; and step three, according to self-adjustment of the rotary inertia J and the damping D, closed-loop control is performed on the |delta f|, and finally, grid connection of a distributed photovoltaic power generation system is realized. According to the VSG+ method with the rotary inertia and damping self-optimization-trending, provided by the invention, the rotary inertia J and the damping D in the VSG are adaptively adjusted as the |delta f| changes, the rotary inertia J and the damping D after adjustment then perform feedback regulation on the |delta f|, and finally, zero impact during grid connection of photovoltaic inverters is realized, such that the acceptance capability of a power network for the distributed photovoltaic power generation system is improved.

The invention relates to one voltage decoupling transducer gear vector control method with parameters self-integrating functions, which tests transducer displacement motor stator end voltage, current and rotor speed through outlet voltage test unit, current test unit and speed test unit; according the vector converting the three-phase voltage, current into two-phase rotation coordinates value; for control given value exerting negative feedback adjust and for computation; through decoupling to get control value through inverse vector conversion computation to get three-phase voltage control value for recycle execution.

The invention relates to a method for controlling drive pulses of a DAB type bidirectional isolation DC-DC converter. The method for controlling the drive pulses of the DAB type bidirectional isolation DC-DC converter comprises the steps of firstly, carrying out drive pulse control on the DAB type bidirectional isolation DC-DC converter based on a drive pulse working principle; and then inferring relevant formulas in the mode of control, and carrying out characteristic analysis and verification. The method for controlling the drive pulses of the DAB type bidirectional isolation DC-DC converter only needs to control a single variable, is simple and practical, applicable to the state of light load of a system, simple in algorithm, convenient to achieve, and prone to feedback regulation, reduces stress of devices, and effectively improves system efficiency when the system is in light load.

A method and an apparatus are provided for performing run-to-run control of trench profiles. At least one semiconductor wafer is processed. A trench metrology data from the processed semiconductor wafer is acquired. Data relating to at least one process chamber characteristic is acquired while processing the semiconductor wafer. A chamber characteristic adjustment process is performed in response to the trench metrology data and the data relating to the processing chamber characteristic. A feedback adjustment of the processing chamber characteristic is performed in response to the chamber characteristic adjustment process.

The invention relates to an electric power bicycle driving system capable of recognizing the state of a road. The electric power bicycle driving system comprises a brake control unit, a cadence sensing unit, a gradient sensing unit, a human-computer interaction interface, a logic control unit, a motor driving unit, a motor and a power rate regulating unit. The brake control unit, the cadence sensing unit and the gradient sensing unit are connected to the logic control unit respectively, the logic control unit is connected to the motor driving unit, the power rate regulating unit and the human-computer interaction interface respectively, the motor is simultaneously connected with the motor driving unit and the power rate regulating unit, and the power rate regulating unit is connected with the human-computer interaction interface at the same time. The logic control unit and the human-computer interaction interface mutually conduct feedback regulation, and the human-computer interaction interface and the power rate regulating unit mutually conduct feedback regulation. According to the electric power bicycle driving system, the power rate of the motor can be regulated by manually regulating a control button of the human-computer interaction interface, the gradient of the road can be also monitored at any time through the gradient sensing unit, the power rate of the motor can be increased or decreased according to uphill or downhill, and therefore a cyclist is always in a comfortable state.

The invention relates to a method for detecting the start of combustion in the combustion chamber of an engine with autoignition. In the method, the profile of the cylinder pressure is measured and the signal which is obtained in this way is transformed using wavelet functions. A sudden rise in the absolute value of the wavelet coefficients which are obtained indicates the start of combustion. The simple and at the same time precise detection of the start of combustion which is possible in this way can be used within the framework of a feedback regulation—by changing engine operating parameters such as, for example, the start of injection of the fuel—to regulate the start of combustion in a desired way.

The invention discloses a method for reducing communication loads and the energy consumption of a data center. The method includes enabling a dispatching center to compute an initial placement sequence of virtual machines according to an expenditure matrix and a service demand matrix; configuring service communication data to corresponding switchboards and links according to bandwidth constraint conditions and acquiring an initial service routing information table; judging whether an execution communication duration of a task carried by a current virtual machine exceeds a communication duration threshold value or not, and migrating the current virtual machine into a target physical machine logically closest to a target virtual machine if the execution communication duration of the task carried by the current virtual machine exceeds the communication duration threshold value; enabling the dispatching center to judge whether all the virtual machines carried with tasks with execution communication durations exceeding the communication duration threshold value are migrated or not, enabling the dispatching center to update the initial placement sequence of the virtual machines and the initial service routing information table if all the virtual machines carried with the tasks with the execution communication durations exceeding the communication duration threshold value are migrated, and closing the switchboards which are not used by the data center. The method has the advantages that network information dynamic perception and feedback regulation functions can be realized, services with the communication durations exceeding the duration threshold value are reasonably distributed, the usage amount of the switchboards is reduced, and the purpose of saving energy for the data center is achieved.

The invention relates to an automotive anti-lock braking and braking energy feedback integration control hardware-in-the-loop test bed, which comprises a front braking gas path, a rear braking gas path, and a braking control unit, wherein the front braking gas path comprises a gas source, a gas storage cylinder and a front braking feedback regulation valve which are orderly and serially connected, and a gas outlet end of the front braking feedback regulation valve is connected with two gas paths which consist of a front ABS electromagnetic valve, a front braking gas chamber and a front brake respectively and are serially connected; the rear braking gas path comprises a gas source, a gas storage cylinder and a rear braking feedback regulation valve which are orderly and serially connected, and a gas outlet end of the rear braking feedback regulation valve is connected with two gas paths which consist of a rear ABS electromagnetic valve, a rear braking gas chamber and a rear brake respectively and are serially connected; and the braking control unit comprises pressure sensors, a wheel speed sensor, a host, an Autobox, a data acquisition and signal emission system connected with the Autobox, an electronic control unit and a bench. The test bed can simulate mixed-power commercial vehicles with air pressure braking systems, and perform braking control and research on the mixed-power commercial vehicles.

The invention discloses a medical salt mist measuring and control instrument and a salt mist concentration quantitative control method. A spiral feeding device comprises a tubular spiral conveying device installed on an atomization cup, a feeding bin, a stepping motor and a gear system. A measuring and control system comprises a single-chip microcomputer, an air pressure sensor, an air flow sensor, a controllable air flow valve, a stepping motor driver, an infrared receiver, an interface circuit, an infrared wireless keyboard, an LCD and the like. The spiral conveying device is driven and controlled by the stepping motor to convey salt powder from the feeding bin to the atomization cup through a circular tube at the approximately-constant speed, a jet-type atomization mode is adopted, salt mist with different flows and different concentrations is generated through feedback adjustment on air flow on the basis of airflow air pressure information detection, the powder can be conveyed in a quantitative mode at a constant speed, the powder conveying quantity can be adjusted at any time according to requirements, compressed air flow is controllable and adjustable, operation and use are user-friendly, and the medical salt mist measuring and control instrument and the salt mist concentration quantitative control method can be applied to detection of and control over medical salt powder quantitative conveying and stable atomization.

The invention discloses a zooming tracking method based on focusing evaluation value feedback regulation. The zooming tracking method comprises the following steps that S101, the automatic focusing is realized before the zooming starting, in addition, the position of a zooming motor with the focusing success and the position of a focusing motor with the focusing success are read, an initial object distance is worked out according to the position of the zooming motor and the position of the focusing motor, the initial object distance is used as the current track object distance, and then, the step S102 is executed; S102, a focusing curve corresponding to the current tracking object distance in a focusing curve group is selected as a tracking curve, and the zooming motor and the focusing motor are driven to carry out object distance tracking according to the tracking curve; S103, the tracked object distance is finely regulated, a zooming amplification process from a wide-angle end to a long-focus end is started, in addition, a focusing evaluation value corresponding to the finely regulated tracking object distance is generated, the current tracking object distance is modified according to the focusing evaluation value, the modified tracking object distance is used as the new current tracking object distance, and then, the operation returns to the step S102. The invention also discloses a zooming tracking system based on focusing evaluation value feedback regulation.

The invention relates to an artificial climate system, and particularly relates to an artificial climate system for a soil-vegetation-atmosphere continuous system model test, belonging to the field of environmental geotechnics. The artificial system can simulate the natural change of climate environments such as wind, rain, illumination, temperature, humidity and the like. The artificial climate system consists of an artificial climate box body, a box body liner, a light source, a rainmaking device, an intelligent control system, a multi-channel converter, an airflow circulation system, a rainwater circulation system, a temperature/humidity regulation system, a CO2 and O2 regulation system, a climate parameter sensor group and a digital imaging system. The system can realize automatic feedback regulation of the rainfall intensity, the illumination direction and intensity, the wind speed and direction and the temperature and humidity. Meanwhile, by adopting a top-rotatable rainfall illumination integrated device, the problem of position overlapping of the rainfall device and the illumination device is solved, and the uniformity of the illumination intensity and rainfall intensity in the horizontal plane is guaranteed.

The invention discloses a coordinated control system of a thermal power generating unit and a coordinated control method of the coordinated control system. The coordinated control system of the thermal power generating unit is used for driving a boiler and a steam turbine inside the thermal power generating unit, and comprises a boiler main controller, a feedforward control module and a steam turbine main controller. The boiler main controller drives a feedback adjustor PID of the boiler main controller to conduct control operation according to a deviation signal between main steam pressure and a preset pressure, so that the deviation value of the deviation signal is zero. The feedforward control module increases response speed of the boiler through two or more feedforward signals to compensate for the inertia of the boiler. The steam turbine main controller processes the deviation signal when the deviation value of the deviation signal exceeds a preset deviation value so that the deviation value can be decreased. The conflict between rapidness of adjustment of the steam turbine and delay of adjustment of the boiler is eliminated, the demand for unit load response speed is met to the maximum degree, and the operating stability of the thermal power generating unit is improved.

The invention relates to a catheter for endovascular treatment on hypertension, in particular to a medical catheter for clinical endovascular intervention treatment on hypertension. The catheter has the functions of monitoring the temperature of the vascular tissue of the renal artery and measuring the local impedance of the tissue of the renal artery, and is used for carrying out feedback regulation on radio and high frequency current intensity to block bilateral renal sympathetic nerves and interdict sympathetic nerves to excite the kidney to generate and secrete renin-angiotensin, thereby achieving the purpose of reducing blood pressure. The catheter provided by the invention is made by compositing temperature plastic polymers and wire meshes, wherein the hardness of a near end is larger, a far end is softer, and multiple channels are formed in a catheter body; a far-end electrode is made from platinum (or gold) composite materials at the front end of the catheter, and multiple leads and drawing wires of the electrode are connected with a handle and a joint through the channels in the catheter body; and high-efficiency electrical isolation pipes and drawing pipes arranged in the channels of the catheter body ensure electrical signal transmission and smooth traction, thereby finishing bending and stretching operations.

The invention relates to a reverse flux-weakening control type intelligent permanent magnet contactor with no position sensor, which mainly comprises a microprocessor, a rectifier and filter circuit, a control voltage detection module, switch control circuits, power switches, a coil voltage/current detection circuit, a switch power supply circuit, a standby power supply control module and the like. A first switch control circuit drives a power switch Q1 to be conducted with a power switch Q3 to realize the forward flux increasing of a coil; and a second switch control circuit drives a power switch Q2 to be conducted with a power switch Q4 to realize the reverse flux weakening of the coil. The voltage and current signals of the coil are detected in real time to estimate the real-time displacement signals of a movable iron core during the closing of the contactor to realize a detection method without using a position sensor. Through the feedback of the displacement signals of the movable iron core, by adopting the reverse flux-weakening control strategy, the detection-feedback-regulation-control intelligent closed loop operation is realized in the closing process of the contactor, the dynamic attractive force and the counter force of the permanent magnet contactor are in good matching, the primary bounce and the secondary bounce of the contact are reduced, and the electrical service life and mechanical service life of the contactor are improved.

For reducing feedback-conditioned oscillations in a hearing aid device, microphone signals of a first microphone and of a distanced, second microphone are compared to one another. When oscillations are detected at the same frequency in both microphone signals, these oscillations are determined to be useful (non-feedback) tonal signals. Oscillations that are only present in one of the microphone signals, in contrast, are feedback-conditioned and are suppressed using suitable measures.

A method of regulating voltage at an output of a switching power converter, the converter comprising a switch and pulse generation circuitry, the pulse generation circuitry producing one or more drive signals for cycling the switch ON and OFF, wherein if the switch is cycled ON and OFF according to a cycle of a drive signal, power is transferred from a source to a load. The method includes sensing an output voltage feedback signal, comparing the sensed feedback signal to a reference at a determined time during a cycling of the switch, and regulating an output voltage at the load by controlling whether a cycle of one of the drive signals cycles the switch in response to the comparison.