73results about How to "Eliminate overshoot" patented technology

Packet flow rate control techniques are enhanced by the interactive and early invocation of packet queuing to control short flows of packets and to eliminate undershoot and overshoot of a targeted flow rate. Packet queuing involves the scheduled release of packets in accordance with flow policies (priorities) to achieve a preselected outgoing target flow rate. The combination of controlled packet queuing and packet flow rate control with appropriate mechanisms for favoring one over the other improves the efficiency of data transmission.

The invention relates to a hybrid-energy thermostatic control water heater, which belongs to the technical field of water heaters. The water heater comprises a gas heating part, an electric heating part and a control circuit, wherein the control circuit comprises an electric energy output control device; the electric heating part consists of a water flow channel and an electric heating device arranged in the water flow channel; the gas heating part and the water flow channel of the electric heating part form a series or parallel flow passage; an ultimate water outlet of the flow passage is provided with a temperature sensor; the output end of the temperature sensor is connected with the signal input end of the control circuit; the signal input end is connected with the controlled end of the electric energy output control device through the control circuit; and the output end of the electric energy output control device is connected with the electric heating device. The water heater has the advantages that the water heater is very sensitive and accurate in temperature regulation, and can effectively guarantee the temperature constancy of effluent water.

The invention discloses a variable air volume room temperature control method based on fuzzy PID and a prediction control algorithm. The method comprises the steps that the temperature deviation between an expected room temperature and an actual room temperature is input to a fuzzy adaptive PID controller, PID parameter incremental quantity of the opening degree of a tail end air valve is obtained through calculation, and calibrated opening degree of the tail end air valve is output; the opening degree of the tail end air valve of the fuzzy adaptive PID controller is subtracted from the opening degree of the tail end air valve of a previous moment by utilizing a time delay link to obtain the variable quantity of the opening degree of the tail end air valve; the prediction control algorithm is adopted to obtain the actual opening degree of the tail end air valve through the variable quantity of the opening degree of the tail end air valve, and the room temperature is maintained at a set value and is kept unchanged. The control method combining the fuzzy PID with the prediction control algorithm is adopted to solve the technical problems that parameter setting difficulty is large, working condition adaptive capacity is poor, and adaptive ability is weak in an air conditioning system in the prior art.

The invention discloses an LDO circuit which comprises an overshoot restraining circuit and an LDO body circuit. The overshoot restraining circuit comprises a current comparator, a second PMOS tube, a first resistor, a first capacitor and a third PMOS tube. The current comparator compares the tail current of a differential amplifier of the LDO body circuit with the image current of a first active load. In the power-on process, the current comparator outputs a low level and makes the second PMOS tube powered on through the characteristic that the tail current is established earlier than the current of the first active load, the first capacitor is charged after the second PMOS tube is powered on, the grid voltage of the third PMOS tube is raised later than the supply voltage so that the third PMOS can be powered on, the grid voltage of the first PMOS tube at the output end of the LDO body circuit is changed together with the supply voltage after the third PMOS is powered on, and therefore the overshoot of the LDO output voltage in the power-on process is eliminated.

One method of obtaining an initial adjusted mass flow controller valve start position comprises obtaining a mass flow controller delay period and setting a mass flow controller valve to an initial valve opening position that is less than an expected optimal valve opening position. An initial desired flow rate and initial operating conditions are input into a control system that is in communication with the valve, and the control system is initiated. The control system is adapted to adjust the valve opening position to achieve the initial desired flow rate, while taking into account flow rate and valve position feedback to the control system. During operation of the MFC and control system, the valve position and the flow rate are recorded in one embodiment and a flow rate that one of meets and exceeds a threshold is detected. An initial-flow time-period extending from the time of control system initiation to detection of the threshold being one of met and exceeded is determined and the mass flow controller delay period from the initial flow time period is subtracted from the initial-flow time-period to obtain an adjusted start time. The valve opening position at the adjusted start time is set as the initial adjusted mass flow controller valve start position.

The invention discloses a leveling control system of a land leveller scraper. The system comprises a hydraulic system, and also comprises a detection sensor, a microcontroller and a proportional flow valve driving circuit which are connected in sequence, wherein the detection sensor detects the real-time horizontal tilt angel theta of the scraper; the microcontroller computes angular speed omega according to the horizontal tilt angel theta of the scraper through an I-PD control algorithm, which is taken as a reference value and is transmitted into a nonlinear limit curve; if the value omega exceeds the working range of the nonlinear limit curve, the practical output control angular speed omegaref is equal to omegaMAX, wherein omegaMAX is the maximum angular speed provided by the hydraulic system; otherwise omegaref is equal to omega; omegaref is taken as a PWM duty cycle value, obtained control voltage U0 is sent to the proportional flow valve driving circuit comprising a PWM switching voltage controlled constant flow source circuit, and a proportional flow valve is driven, so that the hydraulic system levels the scraper. The system and the method can effectively eliminate the phenomenon of overshoot of the scraper, improve the response speed and the control accuracy of the scraper, reduce system power loss and mechanical wear, and improve the land leveling efficiency.

The invention relates to a low-cost solar electromagnetic power assisting bicycle. The low-cost solar electromagnetic power assisting bicycle is composed of a bicycle shopping basket solar cover board 2, a position sensor 4, an electromagnetic power assisting plate 5, a rear luggage-carrier solar cell panel 6, a power assisting permanent magnet 8 and a torque sensor 25. A torque signal sensing coil 24 and the position sensor 4 transmit torque signals and bearing signals of bicycle movement states to an electric control board 26, the electric control board controls the electromagnetic power assisting plate 5 through a brake electric control assemble line 12, and the bicycle shopping basket solar cover board 2 and the rear luggage-carrier solar cell panel 6 provide power to a storage battery 7. According to the low-cost solar electromagnetic power assisting bicycle, a motor is not adopted, the power assisting system cannot change feelings of a rider, the solar cell panel is adopted to supply power, energy is saved, when the bicycle is braked, the electric power can be recycled automatically, and the labor energy of the rider is saved. The low-cost solar electromagnetic power assisting bicycle is a small and exquisite power assisting device which is excellent in performance, is extremely simple in structure, good in market prospect and free from discharging and has an extremely important value on bicycle popularization and usage.

The invention provides a position controlling method of an EOV (Electrically Operated Valve). The method comprises the steps of obtaining, a practical position signal through a controller, determining the rotating direction of a motor by comparing an objective position with a practical position, and calculating a deviation between an existing position and the practical position in the course of operating the EOV; when the position deviation is greater than a temporary parking scope, setting the objective position to be a temporary parking point, and calculating a proportional, an integral and a differential adjusted by a duty ratio of a PID (Proportion Integration Differentiation) of the motor; when the motor operates to be close to a temporary parking point, delaying for a period of time, and then setting the objective position to a primary objective position, and calculating the proportional, the integral and the differential adjusted by the duty ratio by virtue of a PID control strategy; and keeping an existing opening after the motor operates to an original objective position. The position controlling method has the advantages that a temporary parking strategy is increased on the basis of the PID control of the position of the EOV, the overshooting phenomenon of the EOV can be eliminated and the reliable and stable operation of the motor can be ensured under the precondition of improving the response time of the EOV.

The invention relates to a pulse-type laser adjustable rapid normal pressure intelligent drive circuit, suitable for driving a quantum cascade laser (QCL) in environment gas opto-acoustic spectrum monitoring, and also used for occasions where a QCL or other pulse-type lasers are employed in infrared counteraction, narcotics and explosive monitoring, and terahertz imaging fields, and belongs to the electronic equipment technical field. The pulse-type laser adjustable rapid normal pressure intelligent drive circuit can output current with an amplitude greater than 1.7 amperes under a 12V DC power source and an equivalent resistor 2.73 omega; in addition, increase / decrease time is no more than 20 nanoseconds, a pulse width can be randomly adjusted, a smallest pulse width can be as low as 20 nanosecond, and a largest repetition frequency exceeds 1 MHz; the intelligent drive circuit has shorter edge time compared with a present laser pulse driving circuit, and an adjusting scope of pulse parameters is wider and more flexible.

One method of obtaining an initial adjusted mass flow controller valve start position comprises obtaining a mass flow controller delay period and setting a mass flow controller valve to an initial valve opening position that is less than an expected optimal valve opening position. An initial desired flow rate and initial operating conditions are input into a control system that is in communication with the valve, and the control system is initiated. The control system is adapted to adjust the valve opening position to achieve the initial desired flow rate, while taking into account flow rate and valve position feedback to the control system. During operation of the MFC and control system, the valve position and the flow rate are recorded in one embodiment and a flow rate that one of meets and exceeds a threshold is detected. An initial-flow time-period extending from the time of control system initiation to detection of the threshold being one of met and exceeded is determined and the mass flow controller delay period from the initial flow time period is subtracted from the initial-flow time-period to obtain an adjusted start time. The valve opening position at the adjusted start time is set as the initial adjusted mass flow controller valve start position.

An image forming apparatus has a fixing unit that applies heat energy to non-fused developer on a medium. The medium is advanced in a transport path and a heater supplies heat energy to the fixing unit when the medium passes the fixing unit. When a trailing end of the medium is a predetermined distance upstream of the fixing unit, a controller operates in a first mode in which the controller causes the heater to supply a first amount of heat energy to the fixing unit. When the trailing end of the medium is within a predetermined distance upstream of the fixing unit, the controller operates in a second mode in which the controller causes the heater to supply a second amount of heat energy to the fixing unit. The second amount of heat energy is smaller than the first amount of heat energy.

Packet flow rate control techniques are enhanced by the interactive and early invocation of packet queuing to control short flows of packets and to eliminate undershoot and overshoot of a targeted flow rate. Packet queuing involves the scheduled release of packets in accordance with flow policies (priorities) to achieve a pre-selected outgoing target flow rate. The combination of controlled packet queuing and packet flow rate control with appropriate mechanisms for favoring one over the other improves the efficiency of data transmission.

A heat pump air conditioner includes an intake side heat exchanger including heat transfer pipes passing a refrigerant and being arranged in a direction along an air inlet face, intake heat exchanger configured to cool or warm air and supply the air to a space. A plurality of heat pumps include a plurality of compressors and configured to compress the refrigerant and supply the compressed refrigerant to the heat transfer pipes and a plurality of heat side exchangers and connected to the respective compressors, the heat pumps sharing the air intake side heat exchanger, and a controller configured to switch a state of the compressors and between an operating state and an operation stopped state. The controller controls the compressors and to switch an operation of each of the compressors and between starting and stopping in accordance with a magnitude of an air-conditioning load.

The invention discloses a surface acoustic wave sensor excitation and inquiry device which comprises a transmitting link, a receiving link, an overshoot shaping module, a selective switch and a control module. The transmitting link is used for transmitting excitation signals under control of the overshoot shaping module, the input end of the transmitting link is connected with the control module, and the output end of the transmitting link is connected with the selective switch; the receiving link is used for receiving echo signals under control of the overshoot shaping module, and the input end of the receiving link is connected with the selective switch; the overshoot shaping module is used for eliminating overshoot of switch control signals generated by the control module, the input end of the overshoot shaping module is connected with the control module, and the output end of the overshoot shaping module is connected with the transmitting link, the receiving link and the control end of the selective switch; the selective switch is used for enabling the transmitting link or the receiving link to be connected according to the received switch control signals from the overshoot shaping module, and one end of the selective switch is connected with an antenna; the control module is used for configuring output frequency of signal sources in the transmitting link and the receiving link and meanwhile generating the switch control signals.

The invention discloses an infrared axle temperature detection system modulation type probe infrared radiation modulation device comprising a modulation driving board, a brushless DC motor and a radiation modulation disc. The modulation driving board comprises a power supply module, a control module, a power inversion module, a circuit protection module, a position signal processing module and a modulation signal processing module. When a wheel sensor in the train coming direction of the rail side detects passing of a train, the wheel sensor transmits a train passing signal to a control machine, and the control machine detects the signal and then transmits a modulation signal to an infrared probe. The modulation driving board receives the modulation signal and then drives the brushless DC motor to stably operate at the designated rotating speed in a high-speed way so as to drive the radiation modulation disc to rotate at the designated speed to modulate axle temperature infrared radiation of the train into radiation flux of which the amplitude continuously changes along with time. Advantages of the infrared axle temperature detection system modulation type probe infrared radiation modulation device are that the device is based on the principle of digital pulse width modulation and is high in precision, high in regulation speed, high in anti-noise performance, low in cost, low in power consumption, flexible to control and great in dynamic response.

The invention relates to an automobile steering non-overshoot electromagnetic power assisting device, which consists of a torque sensor 3, an aspect sensor 4, an electromagnetic power assisting disk 5 and an electric control board 6, wherein a revolving shaft of the torque sensor 3, a revolving shaft of the aspect sensor 4 and a shaft of a rotor of the electromagnetic power assisting disk 5 are coaxial with a steering shaft 2 of a steering wheel; the torque sensor 3 and the aspect sensor 4 are used for transmitting a torque signal and an aspect signal of the steering wheel operated by a driver to the electric control board 6 through a single wire 9; and the electric control board is used for controlling the electromagnetic power assisting disk 5 through an electric control power supply line 7. In the automobile steering non-overshoot electromagnetic power assisting device, power-assisted steering is realized by adopting the electromagnetic power assisting disk instead of a motor, so that a steering command is not required to be transmitted to the motor, and overshoot is eliminated fully; and the steering disk and a steering wheel are connected through pure mechanical components, so that the road effect is direct, the structure is extremely simple, the reliability is improved, the manufacturing cost is lowered, the aims of convenience, energy saving and rapid response are fulfilled, and the automobile steering non-overshoot electromagnetic power assisting device has a plurality of advantages and a great market prospect.

The invention provides pulse welding equipment and a control method thereof. The pulse welding equipment comprises a main welding instruction wire-feeding speed determining unit, a preset instruction standard voltage determining unit, an actual wire-feeding speed acquiring unit, a supplement beginning time determining unit, a supplement voltage calculating unit and a control unit. According to the pulse welding equipment and the control method thereof, the wire-feeding overshoot can be automatically calculated, the voltage can be increased according to the wire-feeding overshoot, and therefore wire-feeding overshooting can be effectively eliminated.

The present invention discloses a both-way DC-DC convertor control method based on transition process arrangement. The method comprises: employing a system identification nonparametric modeling description both-way DC-DC converter dynamic features to allow the step response feature carve of a converter to be equivalent to a linear second-order model, and calculating system parameters required for identification; employing backward difference approximation of differential terms and integral terms in an original PID controller difference equation, arranging a transition process; and employing the accelerated speed function of the transition process of the both-way DC-DC converter, and finally obtaining an arranged process function. On the basis of obtaining a converter second-order linear model transfer function through adoption of the identification method, the both-way DC-DC convertor control method based on the transition process arrangement employs the PID controller of arrangement of the transition process to control the DC-DC convertor, and the arrangement of the transition process can eliminate overshoot of output voltage and current in the initial operation stage of the converter to solve the contradictory problem between the system overshoot and the transient time to a certain extent, take the time reaching stability as control standard and realize that the system reaches a stable state without overshoot.

The invention belongs to the field of direct current conversion, and provides a DC-DC conversion circuit and a DC-DC chip. The DC-DC conversion circuit and the DC-DC chip are characterized in that a current dividing module is controlled according to changes of the feedback voltage at the DC-DC output end to carry out current division on a charging current of a charging and discharging module, the charging current of the charging and discharging module is accordingly changed, then the charging time of a charging and discharging capacitor is changed, the oscillation period of an oscillation circuit is further changed, and the soft start aim is achieved. According to the DC-DC conversion circuit, the soft start period of the DC-DC conversion circuit can be adjusted, pins special for the chip are not required, the capacity of the charging and discharging capacitor is not required to be increased, the design is simple, the cost of the DC-DC conversion circuit is reduced, a surge current at the output end when the DC-DC conversion circuit is started can be suppressed, and voltage overshooting is avoided.

The invention relates to a circuit and a method for achieving low pressure and high precision of a reference voltage source. According to the technical scheme, a depletion-mode NMOS (N-channel metal oxide semiconductor) tube with a low threshold value and a starting circuit for real-time monitoring are introduced on a band gap core circuit, output of an error amplifier is connected with a source following tube NMOS and then supplies current to Q1s and Q2s, system gain is reduced, influences of offset voltage on precision of output voltage are reduced, and the system stability is improved; further, the source following tube NMOS adopts the depletion-mode NMOS tube, the pressure difference between power voltage and reference voltage is reduced, and accordingly, the structure can work in a low-voltage system; further, the starting circuit monitors the reference output voltage in real time, the overshoot phenomenon of the output voltage is eliminated, and quick and stable output of reference voltage is guaranteed.

The invention provides an automotive electronic throttle valve control method and device. The device comprises a curve set module, an opening detection module, a starting point value selection module and an increment adjustment module, wherein the curve set module is used for setting a electronic throttle valve balance resistance curve; the opening detection module is used for detecting the current opening of an electronic throttle valve; the starting point value selection module is used for selecting the PWM starting point value for conducting PID increment adjustment on the electronic throttle valve balance resistance curve set by the curve set module according to the difference value between the current opening of the electronic throttle valve detected by the opening detection module and the target opening; the increment adjustment module is used for selecting the corresponding increment PID adjustment mode according to the absolute value of the difference value between the current opening and the target opening of the electronic throttle valve, conducting PID increment adjustment on the current opening of the electronic throttle valve according to the PWM starting point value selected by the starting point value selection module so that the current opening of the electronic throttle valve approaches the target opening. By means of the automotive electronic throttle valve control method and device, problems of action lag and overshooting of the electronic throttle valve can be solved.

The invention discloses a temperature balanced electric heating furnace based on multi-area temperature control and belongs to the field of electric heating furnaces. The problem that temperature in a furnace cavity of a traditional electric heating furnace is uneven in the heating process is solved. The temperature balanced electric heating furnace based on multi-area temperature control is composed of a rear area electric heating wire, a middle area electric heating wire, a front area electric heating wire, heat preservation filler, a furnace wall, a rotary shaft, a furnace opening, a furnace door, a furnace cavity, a furnace hearth, a liftable supporting board device, a front area thermocouple, a middle area thermocouple, a rear area thermocouple and a temperature adjuster. The temperature adjuster further comprises a thermocouple signal conditioning unit, an A / D conversion unit, a computer, an output isolation module, a controllable silicon controller, an alternating current power supply and an alarm device. The effect that the temperature of the electric heating furnace is balanced within + / -4 DEG C can be guaranteed.

The invention relates to the technical field of undersea observation networks, in particular to a submarine cable electrical simulation device for a submarine observation network, which is used for simulating the structure and function of an undersea observation network submarine cable. The device comprises a high-voltage input interface, a plurality of distributed submarine cable simulation units, a plurality of branch units and a plurality of ground fault simulation units which are sequentially connected in series. The high-voltage input interface is used for receiving a high-voltage power supply provided by a shore base station; the distributed submarine cable simulation unit is used for simulating submarine cable electrical distribution parameters in unit length. The branch units are connected with the main base station and are used for providing electric energy for the main base station and carrying out fault isolation on the main base station; and the grounding fault simulation unit is used for simulating a submarine cable grounding short-circuit fault at any position.

The invention discloses a self-adaptive robust trajectory tracking control method for a quad-rotor unmanned aerial vehicle, and belongs to the field of motion control of unmanned aerial vehicles. According to the method, the gyroscopic effect factor and the wind resistance coefficient of rotor wings are estimated by utilizing a self-adaptive estimation algorithm, and the estimated value is updated in real time according to the motion state of the unmanned aerial vehicle and is used for replacing a real value in a rotor wing control input equation, so that the precision requirement of trajectory tracking of the four-rotor unmanned aerial vehicle on control input is well met; an amplitude limiting function is used for replacing a sign function in a sliding mode reaching law, external disturbance terms in an unmanned aerial vehicle mechanical model are counteracted, the chattering phenomenon of the four-rotor unmanned aerial vehicle in the trajectory tracking process is restrained, and the stability and robustness of the whole unmanned aerial vehicle system are improved; and the overshoot phenomenon in the state variable convergence process is eliminated, so that the attitude and position of the unmanned aerial vehicle have high convergence speed and excellent tracking stability. The method can be applied to the fields of leader patrol, agricultural investigation and military detection.

The present invention relates to a fast starting circuit of a bandgap reference voltage source, wherein the bandgap reference starting circuit comprises: PMOS transistors PM1 and PM2, NMOS transistor NM1, depletion NMOS transistor NM2, a current source; the transistor NM1 and the transistor NM2 The gate is connected to the Ponrst signal; when the Ponrst signal is at a high level, the tube NM1 and the tube NM2 are turned on, and the current source current I bias The bias voltage Pbias_setup is generated by the transistor PM1 at the node corresponding to the drain of the transistor NM1 , so that the voltage of the Pbias signal corresponding to the output terminal of the operational amplifier is equal to the bias voltage Pbias_setup. The invention uses the bias current source to start the voltage reference source, which can eliminate the voltage overshoot phenomenon and improve the stability of the circuit.

The invention provides an automotive electronic throttle valve control method and device. The device comprises a curve set module, an opening detection module, a starting point value selection module and an increment adjustment module, wherein the curve set module is used for setting a electronic throttle valve balance resistance curve; the opening detection module is used for detecting the current opening of an electronic throttle valve; the starting point value selection module is used for selecting the PWM starting point value for conducting PID increment adjustment on the electronic throttle valve balance resistance curve set by the curve set module according to the difference value between the current opening of the electronic throttle valve detected by the opening detection module and the target opening; the increment adjustment module is used for selecting the corresponding increment PID adjustment mode according to the absolute value of the difference value between the current opening and the target opening of the electronic throttle valve, conducting PID increment adjustment on the current opening of the electronic throttle valve according to the PWM starting point value selected by the starting point value selection module so that the current opening of the electronic throttle valve approaches the target opening. By means of the automotive electronic throttle valve control method and device, problems of action lag and overshooting of the electronic throttle valve can be solved.

The invention provides a working point jump control method and system of a wide-range SQUID magnetic sensor. The method comprises, when an output voltage amplitude of the FLL of the wide-range SQUID magnetic sensor reaches an upper-limit voltage amplitude, outputting a control signal to a reset control end of an FLL so that the FLL starts to reset, and, when the output voltage amplitude of the FLL of the wide-range SQUID magnetic sensor reaches a lower-limit voltage amplitude, releasing the control signal so that the FLL naturally enters a locked state. Through two threshold voltage judgment and state control methods, optimal reset control is achieved, accurate switching of working points is ensured, a reset failure is prevented from generating a miscount, reset and relocking processes are also optimized, the shortest time of a switching process is achieved, and the overshoot transient problem generated in traditional reset zero crossing and re-locking processes are prevented.

The embodiments of the present invention disclose a pressure control method in a respirator. The pressure control method comprises the following steps: a set pressure rise period is acquired; a presetpressure control function is acquired, the pressure rising period is parameters of the pressure control function, and the pressure control function comprises a sine function or a cosine function; a pressure control proportion corresponding to current rise time is determined according to the pressure rise period and the pressure control function; a target pressure value is acquired; a current pressure value corresponding to the current rise time of the respirator is determined according to the target pressure value and a pressure control proportion corresponding to the current rise time; pressure of the respirator is controlled according to the current pressure value to realize accurate control of the pressure of the respirator, full air exchange of bubbles in the lungs of a patient and fresh air is facilitated, an overshoot phenomenon of the pressure control in a ventilation process of the respirator is also eliminated, and a ventilation effect of the respirator is greatly improved. In addition, the present invention also provides a pressure control device in the respirator, the respirator and a storage medium.