598results about How to "High control reliability" patented technology

The invention discloses a control method and device for an air conditioner compressor, and an air conditioner. The control method comprises the step of circularly executing the following winding switching control processes: the temperature difference between the real-time indoor temperature and an indoor temperature target value is calculated, and the real-time indoor temperature difference is obtained and compared with a first set indoor temperature difference threshold; if the real-time indoor temperature difference is not less than the first set indoor temperature difference threshold, windings of the compressor are controlled to be connected in a triangle mode; and if the real-time indoor temperature difference is less than the first set indoor temperature difference threshold, the windings of the compressor are controlled to be connected in a star-shape mode. By applying the control method, overall operation performance of the air conditioner can be improved.

The invention relates to a load fault diagnosis detection method and a device thereof. Rise phase current waveform sampling is driven through a load, comparison with a preset threshold is carried out, logic overturn of a diagnosis signal which exceeds the threshold occurs, a time of a logic overturn moment of the diagnosis signal is detected, the time and a preset benchmark value are contrasted and analyzed, hereby whether the load has short circuit, circuit break and load over-limit faults is determined, and simultaneously, whether the short circuit fault is short circuit to ground or short circuit to a power supply can be determined; through measuring time of drive starting moment and ending moment of diagnosis signal overturn, comparison with a driving signal is carried out, and hereby whether pulse width output of the driving signal has abnormity or not is determined. According to the method, only a diagnosis circuit is added based on a load performer driving circuit, additional cost is low, protection and control reliability in a load performer driving process can be raised substantially, and a foundation for load driving analysis and fault diagnosis is established.

The invention discloses a reliable method for controlling a panel to autonomously track the sun. To meet the energy requirement of a satellite, the solar panel having a one-dimension rotation function is installed on the satellite, and the normal of the panel is made to point to the sun through controlling the rotation of the panel and the attitude of the satellite. According to the invention, no sun sensor is required to be installed on the panel, the information of the solar vector and the current attitude of the satellite are neither needed to be detected by an on-satellite sensor, the rotation target angle of the panel is calculated only according to a sun model and the satellite orbit, then different control areas are set through designing reasonable angle thresholds, the panel is controlled to work at different modes according to the division of the control areas, the switching frequency of the panel among different modes can be lowered through choosing reasonable thresholds, and thus the situation that the panel frequently stops and rotates to disturb the satellite attitude and influence the working life of a motor is avoided. The method for controlling the solar panel to autonomously track the sun is simple and effective, low in implementation cost, and convenient for engineering implementation.

A current sensor for detecting a power supply current is commonly used for detecting a current of a stator winding to detect a rotational position of a magnet rotor, so that a sinusoidal driving is realized without adding two current sensors for detection of a phase current, and also a phase shift circuit and a comparator needed in the conventional 120-degree current feeding are not required, and the number of components can be reduced. Therefore, an inverter device with a low noise and low vibration, having a small size, light weight and high reliability is obtained.

A control unit for a medical device wherein the control unit comprises a pump, a conduit and control means for controlling the flow of fluid from the pump through the conduit; and wherein the conduit is a rigid internal passage located in the control unit.

An electronic control apparatus for a vehicle, which operates a power conversion circuit connected to a rotating machine used as an in-vehicle traction unit to control controlled variables of the rotating machine, includes a controlling arithmetic processing unit which performs arithmetic processing to control the controlled variables of the rotating machine, and a monitoring arithmetic processing unit which monitors the controlling arithmetic processing unit. The monitoring arithmetic processing unit includes an on-monitoring prohibition unit which prohibits outputting an operation signal from the controlling arithmetic processing unit to the power conversion circuit until the controlling arithmetic processing unit is confirmed to be in a normal condition.

The invention relates to a method for controlling the loading switching of an intermediate storage type steel-ball coal mill. The method is based on a system hardware platform of a coal mill and comprises the following steps: establishing a switching rule and adopting a rule-based reasoning method to judge the condition and conduct the control switching; designing the coordinated control on the temperature and the load, and adjusting the coal feed amount u(t) and coordinating and controlling the mill sound y(t) and the mill outlet temperature T(t) by adopting a load and temperature coordinated control algorithm based on PI; designing PI load control, and adopting a PT control algorithm to generate the control quantity u(t) so as to enable the mill sound to track a set value ysp; designing overload control based on the rule-based reasoning, and giving adjustment quantity (triangle u(t)) of the coal feed amount on the basis of the rule-based reasoning. The invention has the advantages that the automatic control of the mill load, the error 'ball package' and the error 'saturated milling' are avoided, the control reliability is improved, the workload of an operator is reduced, and the method contributes to the optimal control and the optimal operation of the mill load.

The invention discloses a BMS detection precision calibration device and a method for an electric automobile battery module. According to the technical scheme of the invention, a battery module, a BMS slave board and a BMS main board are arranged in a constant-temperature box. Meanwhile, the current value, the voltage value, the SOC value and the temperature value of the battery module at various ambient temperatures are collected by charging and discharging equipment and temperature acquisition equipment, with the precision thereof higher than the BMS device, and the BMS slave board at the same time. After that, the current value, the voltage value, the SOC value and the temperature value of the battery module, collected by the charging and discharging equipment and the temperature acquisition equipment, are adopted for calibrating the precision of the current value, the voltage value, the SOC value and the temperature value of the battery module collected by the BMS slave board. According to the technical scheme of the invention, the device and the method are applicable to the wide temperature range from 40 DEG C to 85 DEG C, so that the obtained BMS detection precision is higher than that of the industry standard. Moreover, the BMS detection precision of the electric automobile in various working environments is obtained, so that a more reliable and accurate foundation is provided for the control of the electric automobile. The overall control effect of the electric automobile is improved.

The invention relates to welding equipment for the Y-shaped welding seam of an axle housing body assembly and a welding technology thereof, which belong to the field of the welding processing. The welding equipment comprises a lathe bed 2, a driving machine head 3, a crossbeam assembly 4, a centralized positioning device 5, a pneumatic welding torch lifting mechanism 6, a welding torch adjusting mechanism 7, a driven machine head 8, an oscillator 9, an automatic welding controller 10, an electric control system 11 and a welding source 12, wherein, the driving machine head 3 and the driven machine head 8 are concentric, a vertical adjusting device is arranged in the centralized positioning device 5, air cylinders on the driving machine head 3, the driven machine head 8, the centralized positioning device 5 and the pneumatic welding torch lifting mechanism 6 are connected with the electric control system 11, the circuit parts of the welding source 12 and the electric control system 11 are connected to the automatic welding controller 10 through wires; the ways of manual adjustment and automatic welding are adopted, and the welding equipment is provided with twenty sets of welding sequences; the descending height of the lifting mechanism or the welding torch in the welding process is preset, therefore, the welding current parameters in each procedure can be respectively adjusted in the welding process.

The invention discloses a control system for a stackable multi-color-head three-dimensional printer capable of realizing precision printing. A plurality of color heads of the stackable multi-color-head three-dimensional printer are used for separating hardware parts of a control loop and a heating control loop of each wire feeding pump from a motherboard to form a modular plug-board structure capable of easily ensuring the symmetry consistency; the modular plug-board structures are respectively plugged into interface slots of a heating system and a multi-color control system on the motherboard; by virtue of the symmetry consistency of technical indexes and parameter values of each wire feeding pump, multi-color fuse wires can be fused without temperature difference in a sprayer nozzle when a multi-color-head three-dimensional workpiece is printed, color wires are extruded, and high printing precision is realized. The mechanical strength of the printed workpiece reaches mechanical strength indexes of a material. Meanwhile, the control system is convenient to maintain and replace, simple in structure, stable and reliable; resources are saved, and the energy consumption and the cost are reduced.

An electric-powered compressor comprised of a compression mechanism 110 for sucking in and compressing a refrigerant and an electric motor 120 for driving the compression mechanism formed integrally and provided at a refrigerant suction side of the compression mechanism with a motor drive circuit 130 for driving the motor, wherein at least part of a control circuit 132 provided at the motor drive circuit and controlling the operation of a switching device 131 for adjusting the power supplied to the motor is provided abutting against the surface of the refrigerant suction side 121 or a heat conduction path 124 extending from the surface.

A motor control method with high dynamic response speed and high control precision features that the current loop control instead of speed loop control is used, in which the optimized PI control method is used, the depth of throttle is directly relative to the current iq for dynamically detecting the current value, and the difference between the target current and actual current is used as the input of current loop.

The invention discloses a shaft leakage detecting device used for a continuous coiled tube. The shaft leakage detecting device comprises an underground leakage finding short joint and a coiled tube. The underground leakage finding short joint is connected with other underground equipment at the tail end of the coiled tube, and the underground leakage finding short joint comprises a short joint body, at least one sensor set, a circuit system and an RFID tag reading coil. The RFID tag reading coil is installed on the inner wall of the short joint body and is connected to the sensor set through the circuit system, the sensor set is used for obtaining corresponding parameters of the environment where the sensor set is located, and the circuit system is used for controlling the sensor set to be started and storing the environment parameter data read by the sensor set when the RFID tag reading coil reads an RFID starting tag carrying a starting order. The shaft leakage detecting device is easy to operate, high in reliability and low in cost.

The invention discloses a fire alarm control system which comprises a master controller, a wireless communication module and a power module, wherein the wireless communication module is connected with the master controller; the input end of the master controller is connected with a signal acquisition module and a camera; the output end of the master controller is connected with a water spray suppression device, a guiding system, a broadcasting system and a scavenger fan; the guiding system is connected with an indicator lamp module; the broadcasting system is connected with a loudspeaker box; the wireless communication module is connected with a monitoring host; the signal acquisition module, the camera, the guiding system and the broadcasting system are arranged at the stairway in the building; the water spray suppression device is arranged at the top in the building; the scavenger fan is arranged on the wall and communicated with the outdoor; the monitoring host is arranged in the residential area monitor room. The fire alarm control system can be used for indicating the safe escape direction and displacing the dense smoke outdoors through the scavenger fan while reducing the fire by the water spray suppression device, and has the advantages of high control reliability, high working stability, long service life, strong practicability, good using effect and convenience in popularization and use.

The invention relates to a branch control phase inversion heat exchange system and a branch control phase inversion heat exchange method based on a vapor-liquid heat exchanger. The system comprises a liquid storage tank (20), a heat source heat exchanger (3), a cold source heat exchanger (15) and a vapor-liquid heat exchanger (9); an upper collection tank of the heat source heat exchanger (3) is communicated with the vapor-liquid heat exchanger (9) through a heat exchanger inlet steam pipe (8); a vapor-liquid heat exchanger outlet steam pipe (10) which is arranged on the vapor-liquid heat exchanger (9) is divided into two branches which are communicated with an upper collection tank and a lower collection tank of the cold source heat exchanger (15); the lower collection tank of the cold source heat exchanger (15) is communicated with the upper part of the liquid storage tank (20) through a cold source heat exchanger liquid outlet pipe (17); the bottom of the liquid storage tank (20) is communicated with the vapor-liquid heat exchanger (9) through a heat exchanger inlet condensation liquid pipe (11); and the vapor-liquid heat exchanger (9) is communicated with a lower collection tank of the heat source heat exchanger (3) through a heat exchanger outlet condensation liquid pipe (6). The branch control phase inversion heat exchange system can solve the phenomena of overcooling and overheating and improve heat exchanging efficiency.

A method for controlling a frequency converter is provided. The converter includes a rectifier, an inverter which is connected via a DC link to the rectifier, a rectifier controller and an inverter controller. A minimal rectifier DC link voltage for the rectifier controller is determined, a minimal inverter DC link voltage for the inverter controller is determined, a minimal DC link voltage as the maximum of the minimal rectifier DC link voltage and the minimal inverter DC link voltage is determined, and an optimal DC link voltage reference based on the minimum of the minimal DC link voltage and a maximal allowed DC link voltage is determined. The rectifier controller and/or the inverter controller is/are controlled based upon the optimal DC link voltage reference.

The invention discloses a double heading control circuit device and method for implementing locomotive wireless double heading. The device comprises a double heading control circuit, wherein the double heading control circuit is provided with an electricity key interlock switch and a double heading isolating switch for controlling a double heading intermediate relay; and the double heading isolating switch is a switching unit having a function that the double heading intermediate relay is electrified to start when an electricity key signal is input. The method comprises the following steps: 1) acquiring double heading switching signals in advance by locomotives, judging whether preset conditions are satisfied, and starting the locomotives to perform wireless double heading grouping if so; and 2) in the normal operation process of the locomotives adopting wireless double heading, monitoring the state of the double heading isolating switch in real time by means of the wireless double heading control device, transmitting locomotive control signals in a wireless manner, disconnecting the double heading isolating switch, and then executing a single-unit operation mode. The device and method disclosed by the invention have the advantages of simple operation control, low required cost, no need to change the original double heading control structure and high control reliability.

The invention relates to a solar photovoltaic grid-connected system. The system comprises a grid-connected generation unit, a grid-connected inverter, a master controller, a bidirectional electric energy metering device, a distribution switch and an isolation transformer, wherein the grid-connected generation unit is connected with the grid-connected inverter; the grid-connected inverter is connected with the bidirectional electric energy metering device through the distribution switch; the bidirectional electric energy metering device is accessed to an alternating current power grid through the isolation transformer; and a safety protection device is arranged between the isolation transformer and the alternating current power grid. The grid-connected generation unit comprises at least two photovoltaic arrays, and each photovoltaic array is configured with a photovoltaic lightning-proof combiner box. The grid-connected inverter is connected with the master controller through an inversion control device arranged in the inverter; the isolation transformer is connected with the master controller through a transformer measurement and protection device arranged in the transformer; the bidirectional electric energy metering device and the distribution switch are also connected with the master controller. The master controller adopts a dual-core controller which includes a DSP (Digital Signal Processor) and an FPGA (Field Programmable Gate Array).