33results about How to "Avoid overshoot" patented technology

The invention discloses a method for controlling an inverter compressor. According to the method, a target temperature and a dividing temperature point are preset, and a sensor monitors an actual temperature value. The method comprises the following steps that: a controller judges whether the difference between an actual temperature and the target temperature is zero, and the compressor operates at a minimum frequency for a certain period if the difference between an actual temperature and the target temperature is zero; the controller judges whether the target temperature is reached, and thecompressor stops operation if the target temperature is reached, or the controller initializes a PID parameter to allow an inverter to make the compressor start to raise frequency quickly if the target temperature is not reached; the controller judges whether the preset dividing temperature point is reached, and the PID parameter is adjusted if the preset dividing temperature point is reached, orthe PID parameter is kept constant if the reset dividing temperature point is not reached; and the controller judges whether the target temperature is reached, and the compressor operates at a constant frequency and the frequency inversion is finished if the target temperature is reached, or the compressor raises frequency while keeping the original PID parameter if the target temperature is not reached. Correspondingly, the invention also provides a device for controlling the inverter compressor. The method and the device can realize a quick, energy-saving and stable frequency inversion process at the same time.

The invention provides a composite control method for piezoelectric ceramic positioning. In the method, different control combination ways are adopted in an entire process; a threshold value delta is set; composite control of feedback control and PID (Proportion Integration Differentiation) control, or composite control of feedback control and PD (Proportion Differentiation) control is used selectively according to the magnitude relation between a displacement deviation e (kT) and the threshold value delta. According to the method, a mathematical model is required to be established, the lag and nonlinearity of a piezoelectric ceramic driver are described by adopting the conventional Preisach model, and the parameter of PID or PD is self-tuned on line by using fuzzy control, so that optimal control of a system can be realized, and the system has the advantages of flexibility, high adaptability and the like of fuzzy control. In the method, a selective control method combination is used for the first time, so that the positioning accuracy of piezoelectric ceramic is increased effectively, the stability and interference resistance are enhanced, the response rise time is shortened, and lag and creepage are eliminated effectively simultaneously.

The invention discloses a switching power supply, which comprises a transformer primary side winding, a transformer auxiliary winding, a transformer secondary side winding, and a first control circuit coupled to the transformer primary side winding. The base electrode of a power transistor is connected with the output end of the first control circuit, the collector electrode is connected with the different end of the transformer primary side winding, and the emitter is earthed. The switching power supply further comprises a second control circuit coupled to the transformer secondary side winding, wherein the input end of the second control circuit is connected with the output end of the switching power supply, and the output end of the second control circuit is connected with the different end of the auxiliary winding. When the input voltage Vout of the switching power supply is lower than a first set voltage value, the second control circuit transmits a pulse signal to the first control circuit, and the first control circuit controls the power transistor to be conducted in order to transfer energy to the output end of the switching power supply through the transformer primary side winding. By the invention, the standby power consumption can be improved, and the output voltage precision in the light load and idle load range can be increased.

The invention relates to an enthalpy control-based method and an enthalpy control-based system for controlling energy conservation of an air conditioner. The method comprises the following steps of: increasing and decreasing the load of an air-conditioning system according to the difference values and directions of an enthalpy of an air mixing section and a control target value; making a system operating strategy according to the load of a main unit of the air conditioner and the running state data of each point in the system, an optimal energy efficiency ratio curve of a refrigerating main unit and a principle that the air enthalpy of the air mixing section is close to the control target value so as to comprehensively adjust the chilled water of a central air-conditioning system, cooling water temperature, flow rate, controlled environment end fresh air, air return fan and main unit running load; and therefore, the sum of refrigeration/heat demand of each point and the supply amount of a central air conditioner are balanced.

The invention discloses a vehicle cleaning machine profiling control method and apparatus based on machine vision. An intelligent clearing supplement control function is employed, vehicle body images are acquired and processed by use of an image processing system so as to determine whether a vehicle is well cleaned, if cleaning requirements are not met, an intelligent clearing supplement control program is activated, and a control system carried out cleaning supplement operation. According to the invention, the cleaning quality is improved, an intelligent washing intensity control function is realized, vehicle cleanliness data is acquired by a CCD pick-up head, and the data is taken as a basis of washing intensity control; and for dirty positions of a vehicle body, a control brush is closer to the vehicle body for washing, at the same time, the discharge rate of a cleaning agent and water spray pressure are correspondingly increased, the cleaning intensity is increased, and otherwise, the cleaning intensity is reduced.

The invention discloses a parameter self-tuning method for a PID system. The parameter self-tuning method for the PID system effectively prevents oscillation of a system output wave near a target value SV or deviation value (SV_n) in a self-tuning process, and excitation application on a control object is stopped only when a system sampling value PV reaches the target value SV, thereby guaranteeing that the system output wave always can reach and control the target value SV, and PID control parameters calculated by a controller are more accurate; besides, the self-tuning method respectively firstly acquires a working condition signal no matter how is a system initial state and then judges whether an excitation is applied to the control object according to comparison of an acquired value PVwith the deviation value (SV_n), namely working condition judgment of the method is prior to control output, the overshoot situation is effectively prevented from appearing, and an industrial accident is avoided from occurring; and a complete waveform, namely a corresponding period, is not required in the self-tuning process, and time of the self-tuning process is shortened, thus system self-tuning detection speed is improved, and the industrial accident is avoided from occurring.

The invention relates to the field of communication storage battery management and discloses an online charging and discharging system for a communication storage battery. When the communication storage battery is charged or discharged online, the interior of a communication storage battery pack is subjected to online active balancing, and the situation is avoided that a single battery is overshotand over-discharged and cannot be completely charged. According to the online charging and discharging system, in the discharging process of the storage battery pack, a control system controls a switch network, a charger is in parallel connection with a single storage battery which is low in capacity in the storage battery pack, the discharging speed of the single storage battery which is low incapacity is lowered accordingly, and it is guaranteed that all the single batteries in the storage battery pack complete discharging at the same time; in the charging process of the storage battery pack, the control system controls the switch network, the electronic power load is in parallel connection with the single storage battery which is low in capacity in the storage battery pack, the charging speed of the single storage battery which is low in capacity is lowered accordingly, it is guaranteed that all the single batteries in the storage battery pack complete charging at the same time, and accordingly active balancing of online discharging is achieved. The online charging and discharging system is suitable for the communication storage battery pack.

The invention discloses a three-position operating mechanism with a buffering function. The three-position operating mechanism comprises a mechanism front plate, a mechanism rear plate, an output shaft module, a grounding side closing and separating module, an isolation side closing and separating module, a spring module and a buffering module. All the modules are assembled between the mechanism front plate and the mechanism rear plate. The output shaft module comprises an output shaft, an output shaft crank arm and a driving pull rod. The output shaft is arranged on the middle part of the mechanism rear plate. The grounding side closing and separating module and the isolation side closing and separating module are distributed at the two sides of the output shaft with the output shaft acting as the center. The output shaft crank arm is pivotally connected on the output shaft. The buffering module is fixed on the mechanism rear plate. One end of the buffering module abuts against the external side of the output shaft crank arm. An insulation fault caused by overshooting in separating can be prevented so that the safety of operation can be enhanced.

The invention provides a circuit converter control system which is electrically connected to a circuit converter including an input stage circuit, a load switch and an output stage circuit. In the circuit converter control system, a filter is sued for sampling a historical feedback average voltage according to feedback output voltages at different times for digital signals output by an output end at different times; a control module is provided with a voltage threshold, and is used for receiving immediate feedback output voltages for the digital signals output by the output end and detecting the load state of the circuit converter based on the historical feedback average voltage; and the control module controls the load switch at a control duty cycle, increases the control duty cycle for controlling the load switch when the load state is changed from a light load state to a heavy load state and the voltage difference value reaches the voltage threshold, otherwise reduces the control duty cycle. Therefore, the need for time-consuming circuit redesign is not required, and the problem of overshoot and load reduction of the circuit converter can be effectively solved.

The invention provides a compressor shutdown control method, a compressor startup control method and an air conditioner. The compressor shutdown control method comprises the steps that S1, a compressor receives a shutdown instruction; S2, whether the shutdown instruction is an exhaust protection shutdown instruction or not is judged, if yes, S3 is carried out; S3, the air conditioner runs according to the first running state and runs for t1 time; S4, the current exhaust temperature T<now> is detected, and whether T<now> is larger than or equal to the first preset temperature T1 or not is judged, if yes, S5 is carried out, if not, the compressor is shut down, and an outer fan is shut down; S5, a four-way valve is controlled to reverse, and operation is conducted for t2, then the four-way valve is controlled to restore to the forward reversing state, the compressor is stopped, and the outer fan is closed. According to the compressor shutdown control method, the balance of the refrigerant pressure difference of the compressor is accelerated, and the compressor can be quickly cooled, so that the temperature is reduced to a proper temperature as far as possible before the compressor is started next time, the pressure is balanced, the influence on next starting is reduced, the time interval of next starting of the compressor is shortened, and the use feeling of a user on the air conditioner is enhanced.

The present invention provides an inertial measurement module. The inertial measurement module (100) comprises a control unit (110), an inertial element (120), a temperature sensor (125), a substrate(130), a temperature control element (140) and a housing (160), and the control unit (110) monitors the temperature of the inertial element (120) through the temperature sensor (125) and controls thetemperature control element (140) to control the temperature of the inertial element (120). The control unit (110) and the inertial element (120) are installed at the same surface of the substrate (130), the temperature control element (140) is installed at the other surface of the substrate (130), and the temperature control element (140) is installed on the housing (160).

The invention discloses a four-rotor 3D path tracking method based on nonlinear PD double closed-loop control. The method comprises the following steps: to begin with, setting flight parameters of a four-rotor aircraft, constructing a trajectory model Pc of the four-rotor aircraft, and initializing a result buffer variable buffer and an expected roll angle [psi]c; then, calculating an outer loop control quantity row vector pu of the four-rotor aircraft at the ti moment according to the trajectory model Pc; calculating total thrust Tu, an expected pitch angle and an expected drift angle of the four-rotor aircraft at the ti moment through the outer ring control quantity; calculating an inner ring attitude angle control quantity matrix of the four-rotor aircraft at the ti moment by combining expected attitude; calculating and obtaining a tracking result for controlling the path of the four-rotor aircraft according to the total thrust Tu; and finally, performing cyclic control onthe trajectory model Pc through the set parameters. According to the invention, the stability of four-rotor aircraft can be effectively controlled, a high-accuracy tracking result can be obtained, anda path tracking flight control task of four-rotor unmanned navigation can be completed.