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.

The invention belongs to the field of controller design, and provides a new technical scheme for saturated system composite nonlinear feedback control, which realizes the effect of adjusting samplingmoments in real time according to operating conditions of a system, can ensure the stability of the system and can save communication resources. Thus, the technical scheme adopted by the invention isa saturated system composite nonlinear feedback controller design method based on event triggering. The saturated system composite nonlinear feedback controller design method comprises the steps of: firstly, establishing a saturated system model, and designing a corresponding composite nonlinear feedback controller; and designing an appropriate triggering condition based on the composite nonlinearfeedback controller, sampling and transmitting state information of the system only when the triggering condition is met, and adopting a sampling value for calculation by means of the composite nonlinear feedback controller and updating output of an executor, thereby completing a control task of the system. The saturated system composite nonlinear feedback controller design method based on eventtriggering is mainly applied to controller design.

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.

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 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 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.