90results about How to "Improve startup success rate" patented technology

The invention discloses a sensor-less three-stage type starting method for a deep well piston pump. The piston pump is driven by a direct-current brushless motor, and the starting method includes the following steps that S1, the current position of a rotor is determined based on short-time pulse detection and positioning, and an inverter is controlled according to a controlling strategy corresponding to the position; S2, the step S1 is repeated until revolving speed reaches a first threshold value; S3, the reversing moment is determined based on a pulse width modulation stator current slope, and at the reversing moment, a control strategy of a next sector is used for controlling the inverter; S4, the step S3 is repeated until the revolving speed reaches a second threshold value which is larger than the first threshold value; S5, the reversing moment is determined based on back electromotive force zero passing point detection, and at the reversing moment, a control strategy of a next sector is used for controlling the inverter. The starting method can be used for a high-lift photovoltaic water pumping system and can improve the success rate of starting the system.

The invention discloses a permanent magnet brushless motor sensorless starting method. The permanent magnet brushless motor sensorless starting method comprises the steps that firstly, a rotor is positioned at a specific position through a rotor prepositioning device, single-step acceleration is carried out according to the given single-step acceleration current and single-step acceleration time obtained by calculation, single-step acceleration is directly switched to closed loop acceleration after being carried out, rotor position signals in a three-phase suspended state are detected every fixed period, the power-on phase sequence is determined according to the rotor position signals, whether counter potential signals are stable or not is judged through a signal comparison method while closed loop acceleration is carried out, and when stable counter potential signals can be detected within one phase conversion period, a normal counter potential method is switched to for operation, wherein the single-step acceleration and the signal comparison method can ensure that a motor is started at the highest speed, and the closed loop acceleration process can ensure that the motor supplies power accurately in the acceleration start process and step-out is avoided. By means of the method, an efficient permanent magnet brushless motor can be started accurately, rapidly and efficiently, the optimization process is simple, universality is high, the success rate of starting can be improved greatly, no sensitivity to load changes exists, and the start program does not need to be changed when loads and the working station change within a certain range.

The invention provides a range extender control method and device and a range extending type electric automobile and relates to the field of electric automobile control. The problems that an existing range extender is low in starting successful rate and poor in riding comfort, and an electricity generating situation occurs are solved. The range extender control method comprises the steps that the target drag torque value of a generator is obtained according to the current engine temperature, and fixed torque drag control over the generator is conducted; the rotating speed calibration value for allowing oil injection of the engine is obtained according to the current engine temperature and the atmospheric pressure, and when the actual rotating speed of the generator reaches the rotating speed calibration value, the engine is controlled to inject oil; the rotating speed calibration value for allowing torque attenuation of the generator is obtained according to the current engine temperature and the atmospheric pressure, and when the actual rotating speed of the generator reaches the rotating speed calibration value, torque attenuation control is conducted on the generator; and if the actual rotating speed of the generator is larger than the target idle speed of the engine, the target drag torque of the generator is assigned to be zero, and idle speed control is conducted on the engine. According to the range extender control method and device and the range extending type electric automobile, the starting successful rate and the riding comfort of the range extender are improved, and the electricity generating situation is avoided.

The invention discloses a device and a method for controlling a range extender system of an electric vehicle. The method includes: after the range extender system is activated, if a whole vehicle system has no fault, judging whether a halt condition of a range extender is in a steady state or not; if yes, further judging whether the whole vehicle system has a power generation requirement or not; if yes, recognizing the power generation requirement, and respectively subjecting a power generator and an engine to modulo check according to the power generation requirement; if the power generator and the engine pass the module check, setting a target rotation speed of the power generator, and controlling the power generator to rotate at the target rotation speed to drive the engine to start and enable the engine to reach a starting rotation speed; after the engine reaches the starting rotation speed, controlling oil injection of the engine to start the engine. Therefore, safety and high efficiency in control of the range extender system can be guaranteed, and range extender starting success rate can be increased by optimization of start control logics.

The invention discloses a BMC starting method and system, an electronic device and a computer storage medium. The method and the system are applied to a BMC to obtain a starting instruction. The method comprises: responding to the starting instruction, completing starting based on a preset number of flash memories in the server, and the preset number being larger than or equal to 2; wherein the flash memory comprises data information required for starting the BMC. The invention provides a BMC starting method. The BMC can be started based on the plurality of flash memories, and the plurality offlash memories contain different data information required for starting the BMC, that is, the BMC can be started in various modes, so that the starting success rate of the BMC can be improved, and the working stability of the BMC can be improved. The BMC starting system, the electronic device and the computer readable storage medium provided by the invention also solve the corresponding technicalproblems.

The invention discloses an engine start control method. The engine start control method comprises the steps that zero clearing is conducted on control commands of a motor and a clutch, and the motor and the clutch are in an uncontrolled mode; a clutch combination command is sent, and a position state of the clutch is monitored; when the position state of the clutch is combination, a control mode of the motor is set as torque control; a torque value changing curve of the torque control is a given curve which comprises a period of eliminating gaps and a period of rapidly increasing torsion. According to the engine start control method, the cooperation of the motor and a single clutch is used to drive an engine, due to the fact that the torsion of the torque value changing curve of the motor increases slowly in the period of eliminating the gaps, mechanical impact force generated by driving the torque among the driving parts in a dynamical system is reduced, and the service life of the parts can be prolonged. In addition, by means of the engine start control method, due to the fact that the engine can be driven to the default rotating speed as soon as possible in the period of rapidly increasing the torsion, the start efficiency of the engine is improved.

The invention provides a power supply system and a power supply system starting method, and belongs to the technical field of power supply. The power supply system provided by the embodiments of the present invention comprises a three-port power electronic transformer, a first renewable energy system, a first energy storage system, a second renewable energy system and a second energy storage system; the input end of the three-port power electronic transformer is connected with the high-voltage power grid; the first renewable energy system and the first energy storage system are both connectedwith the alternating current output port of the three-port power electronic transformer; the second renewable energy system and the second energy storage system are both connected with the direct current output port of the three-port power electronic transformer, and the AC / DC distribution, the renewable energy system and the energy storage system are integrated into a power supply system to provide power distribution for the user, so that the economical efficiency, the reliability and the flexibility of user electricity utilization are realized.

The invention relates to a heat pump system, a control method and a refrigerating unit. The heat pump system comprises a compressor, an outdoor heat exchanger, a first throttling device and an indoor heat exchanger. The compressor, the outdoor heat exchanger, the first throttling device and the indoor heat exchanger form a refrigerant circulation system. The heat pump system further comprises a bypass pipeline, the two ends of the bypass pipeline are connected with an inlet and an outlet of the compressor separately, and the bypass pipeline is provided with a first switch device used for opening and closing the bypass pipeline. According to the refrigerant circulation system, balance between high pressure and low pressure can be guaranteed before the compressor is started again, and normal starting power is ensured.

The invention provides a hybrid vehicle and an engine starting method and device thereof. The method comprises the steps that a BSG motor is started; whether the vehicle control unit receives a starting instruction of an engine within a preset time period or not is judged; when the vehicle control unit receives the starting instruction within the preset time period, the vehicle control unit sends a starting torque to the BSG motor; the BSG motor increases the output torque of the BSG motor according to a first preset torque rate by taking the starting torque as a target; and the output torque of the BSG motor is controlled according to the rotating speed of the engine to start the engine. According to the method and the device, when the hybrid vehicle adopts the BSG motor to start the engine, the starting state of the engine is judged by judging whether the rotating speed of the engine meets the corresponding requirements or not in the corresponding stage, and then the output torque of the BSG motor is controlled to start the engine; the use efficiency of the BSG motor is improved, the starting success rate of the engine is increased, and oil consumption and emission of the hybrid vehicle are reduced.

The invention relates to a sensorless starting method for an automobile air conditioner. The sensorless starting method comprises the following steps: determining the initial rotor position of a motor; turning a rotor to an aligning angle in a moving direction; introducing a three-phase current on a stator of the motor, and controlling the generated torque vector angle and aligning angle to be 90 degrees so as to guarantee maximum torque starting; accelerating an open loop at a switching speed; and then switching to closed loop operation to complete the starting process of a compressor. By using the method disclosed by the invention, after the initial rotor position of + / -30-degree electrical angle error is obtained, an aligning strategy is used, the rotor is pulled onto the aligning angle in the moving direction of the compressor, and then the processes of open loop acceleration and closed loop cutting are entered. Compared with a pure inductance method starting manner, the maximum starting torque can be obtained; and compared with a traditional aligning manner, the aligning current and aligning time are reduced, and aligning failures are avoided. Practice shows that the starting success rate can be strengthened and the collision and noise during starting are reduced by using the novel sensorless starting method.

The invention discloses a range extender starting control method and further discloses a range extender starting control device. The range extender starting control method comprises the steps that aninstruction from a vehicle controller is answered, and the starting state of a range extender is checked; whether the stating state of the range extender meets the stating condition or not is judged;if the starting condition is met, a power generator is controlled to drag an engine to be started; when the starting time reaches a preset starting duration, whether the engine is successfully startedor not is judged; if the engine is not successfully started, the number of starting failure times is recorded, and whether the number of the accumulated failure times is smaller than a preset value or not is judged; if the number of the accumulated failure times is smaller than the preset value, the power generator is controlled to stop dragging the engine, and after waiting is conducted for a first preset duration, the step that the power generator is controlled to drag the engine to be started is returned to; and if the number of the accumulated failure times is not smaller than the presetvalue, breakdown information is transmitted to the vehicle controller. According to the range extender starting control method and device, active control over range extender engine starting is achieved, the starting success rate of the range extender can be increased, and the situation that the engine is dragged for a long time and thus the risk occurs is avoided.

The invention provides a fast warming method for a gasoline engine, which comprises the following steps: S1. a crankshaft position signal is obtained by a control unit through a crankshaft position sensor, and a cylinder which executes fast warming is determined by the crankshaft position signal; S2. when the engine is in a cool state, the crowding oil spout correction quantity of the fast warming is calculated by the control unit according to the determined rating data quantity and the collection of elevation factor quantity which influences the startup of the gasoline engine; S3. an execution command is sent by the control unit to the cylinder which executes fast warming; S4. when the ignition is successful, the warming process is completed. The method mainly greatly enhances the startup success ratio of the gasoline engine by correcting the oil spout time inside the cylinder of the gasoline engine to enable the gasoline engine to be faster into a normal operating work state and obtain optimal startup dynamic property; in addition the method and also greatly enhance the tail gas exhaust quality during the startup.

The embodiment of the invention discloses a control method and a control device of a dual-fuel engine. The control method comprises the following steps that water temperature of the engine, ambient temperature and temperature after inter-cooling are obtained; if the temperature after inter-cooling is detected to be greater than a flashpoint of methanol and the water temperature of the engine and / or the ambient temperature is larger than the flashpoint of the methanol, the dual-fuel engine is controlled to be started according to a diesel and methanol dual-fuel mode. According to the control method, the diesel and methanol are used as the dual fuels to intervene in the starting process of the engine, the methanol has the advantages of high cleanness, environmental friendliness and low cost,the fuel cost in the engine starting process in the pure diesel fuel mode can be reduced, and the problem of poor emission of the engine can be solved; the starting success rate is high, and the problem that starting is difficult in a pure methanol fuel mode is solved; the dual-fuel engine has the advantages of good combustion stability and low engine noise after entering the operation stage, andthe problems that combustion stability is poor and engine noise is large when the pure diesel fuel mode is switched to another fuel mode are avoided.

The invention provides an intelligent power module and an air-conditioner. The intelligent power module comprises three phases of upper bridge arm signal input ends, three phases of lower bridge arm signal input ends, three phases of low-voltage reference ends and a current detection end. An HVIC tube is provided with wiring terminals connected to the three phases of upper bridge arm signal input ends and the three phases of lower bridge arm signal input ends respectively, and a first port corresponding to the current detection end. Each phase of low-voltage reference end and the current detection end are both connected to the first end of a sampling resistor, and the second end of the sampling resistor is connected to the negative end of a low-voltage area power supply of the intelligent power module. The first input end of a self-inspection circuit is connected to the U phase of upper bridge arm signal input end, the output end of the self-inspection circuit is connected to the U phase high-voltage area signal output end of the HVIC tube, and the second input end of the self-inspection circuit is connected to the first port. The self-inspection circuit is used for transmitting signals of the U phase of upper bridge arm signal input end to the U phase high-voltage area signal output end and further suppressing voltage noise generated by the first port when the HVIC tube starts working.

The invention discloses a fuel supply system and an aero-engine with the same. The fuel supply system comprises a fuel feeding circuit and a fuel return circuit, fuel in the fuel feeding circuit is subjected to heat exchanging with lubricant via a fuel and lubricant radiator and is then introduced into an engine, the fuel return circuit is provided with a fuel control device used to control a flowing direction of return fuel, and the fuel control device comprises: a conversion valve used to divide the fuel in the fuel return circuit into two branches to be output, wherein one branch leads to the fuel incoming circuit, and the other branch leads to a fuel tank; a thermal switch used to sense inlet fuel temperature of the engine to switch indexing of the conversion valve, so that the return fuel is controlled to flow to the fuel feeding circuit when the inlet fuel temperature is lower than a preset threshold. The fuel returned via a fuel return line is mixed with inlet fuel via the fuel feeding circuit when the inlet fuel temperature is lower than the preset threshold, thus increasing the temperature of the fuel, improving fuel evaporation effect and heat exchanging efficiency of the fuel and lubricant radiator, and improving startup success rate and operation reliability of a power unit.

The invention discloses a parallelization method for black-start sub-systems of a power grid with external supply, belonging to the technical field of operation and scheduling control of the power grid. Based on a black-start research scheme of the power grid, stability check of the sub-systems, voltage calculation of a parallelization circuit of the sub-systems and parallelization simulation check of the sub-systems are performed to determine a feasible parallelization route and a recommended charging direction. Starting from the sub-system with external black-start power supply support and relatively highest stability level, the parallelization with the external power grid is firstly performed, then the parallelization of the sub-systems with the external support is implemented, the parallelization with the sub-systems without the external support and with relatively high stability levels and the parallelization with the sub-systems without the external support and with relatively low stability levels are sequentially performed, and then the parallelization with the remaining sub-systems is performed to form a whole main grid frame of the power grid. According to the parallelization method disclosed by the invention, a basic method and an alternative scheme are provided for effectively restoring the main grid frame of the power grid for a scheduling and operation mechanism of the power grid, the black-start risk is avoided, the black-start success rate is improved, and the parallelization method is favorable for promoting the black-start process of the large power grid and restoring the power consumption requirements in a larger range.

The invention provides a hall engine starting power supply system and method, which are small in impact to a power supply system and a bus. The system comprises a positive power source and a filter circuit, wherein the positive power source comprises a low-voltage power source module, a high-voltage power source module, an auxiliary power source and an enable signal control circuit, wherein input ends of the low-voltage power source module and the high-voltage power source module are connected with each other in parallel; output ends are connected with each other in series; a negative output of the low-voltage power source module is taken as the negative output of a positive power supply source; a positive output of the high-voltage power source module is taken as the positive output of the positive power source; the positive output of the positive power source is connected with a positive input of the filter circuit; the negative output of the positive power supply source is connected with the positive input of the filter circuit; the positive output of the filter circuit is connected with an anode of a hall electric thruster; the negative output is connected with a cathode of the hall electric thruster; an input of the auxiliary power source is connected with a positive end and a negative end of the bus; an output of the auxiliary power source is connected with the low-voltage power source module and the high-voltage power source module respectively and provides electricity to the low-voltage power source module and the high-voltage power source module; and a control end of the auxiliary power source is connected with an output end of the enable signal control circuit.

The invention provides a control method of a static frequency converter for starting a synchronous unit. The method comprises an initial stage of the startup of the static frequency converter and a pulse commutation phase. An overlap trigger pulse is constructed on a trigger pulse of a switching device to ensure that the switching device is triggered to conduct to form a current path and quickly establish a DC bus current. The technical scheme provided by the invention can avoid the accident that a large-scale synchronous unit fails to start due to the fact that a frequency converter cannot establish a DC bus current in a forced commutation phase; and increases the startup success rate of the large-scale synchronous unit without increasing the hardware cost and reduces the risk of unit startup failure and the accident initiation rate of the startup failure.

The invention provides a method for starting a total biological phosphorus removal AOO process. The method comprises the following steps: 1, starting a domestication and enrichment stage before start,comprising (1) anaerobic contact of sludge; (2) high-aeration aerobic domestication of sludge; and (3) sludge amount enlargement and optimum aeration amount search; and 2, starting stage, namely (1)entering a reactor, and respectively setting an anaerobic zone, an aerobic first zone, an aerobic middle zone and an aerobic tail zone, wherein the hydraulic retention time in the anaerobic zone is consistent with that of the traditional AO process; and (2) controlling the dissolved oxygen concentration to be 0.3-0.7mg / L and the hydraulic retention time to be 0.7-1 hour at the aerobic first zone,controlling the dissolved oxygen concentration to be 1.0-1.6mg / L and the hydraulic retention time to be 1.5-2 hours at the aerobic middle zone and the aerobic tail zone, controlling the sludge age tobe 5-7 days, and controlling the reflux ratio to be 50-60%. The method disclosed by the invention is rapid in system startup and high in starting success rate, the operation is stable, and the aeration amount is saved.

The invention discloses a permanent magnet synchronous motor starting mechanism. The permanent magnet synchronous motor starting mechanism comprises an impeller and a rotor, wherein the impeller is provided an installing cavity, the installing cavity is internally provided with a driving sleeve, the rotor is connected with the driving sleeve, and therefore the rotor can drive the driving sleeve to rotate; a buffering piece is installed between the driving sleeve and the inner wall of the installing cavity, the buffering piece and the driving sleeve are mutually interfered in the radial direction, the buffering piece and the inner side wall of the installing cavity are mutually interfered in the radial direction, and therefore the driving sleeve is driven to rotate and drive the buffering piece to rotate, and then the buffering piece drives the impeller to rotate. According to the permanent magnet synchronous motor starting mechanism, the buffering piece and the driving sleeve are mutually interfered in the radial direction, the buffering piece and the inner side wall of the installing cavity are mutually interfered in the radial direction, and therefore the driving sleeve is driven to rotate and drive the buffering piece to rotate, and then the buffering piece drives the impeller to rotate, so that the purpose of starting is achieved, the rotating angle of the buffering piece is large, the starting success rate is high, the damage to a motor is small, and the structure is simple.

The invention provides a method and system for starting a synchronous motor. The method comprises the steps of enabling the synchronous motor to be started and accelerated until reaching a set speed through controlling the output current of a static frequency converter; re-establishing the output current by means of supplementing the pulse and adjusting the pulse width when the establishment of the output current is failed; and determining the adopted control mode according to the output current when the speed of the synchronous motor reaches 10% or above at the same time so as to enable thesynchronous motor to continue to accelerate. The technical scheme provided by the invention is wide in application range, can quickly and accurately recover the output current when the establishment of the output current is failed, and can solve the problems such as speed oscillation of the synchronous motor.

The invention relates to the technical field of PMSM (permanent magnet synchronous motor) position-sensorless control, especially a method for detecting the pre-operation state of a motor. The methodcomprises the steps: enabling a controller to obtain a three-phase current through a current sensor, converting the current of the motor into a two-phase current omega<-30 in a two-phase stationary coordinate system through Clark transformation, converting the current omega<-30 in the two-phase stationary coordinate system into currents Id_fbk and Iq_fbk in a two-phase rotating coordinate system through a Park converter; adjusting a D-axis current given quantity Id_Ref and a Q-axis current given quantity Iq_Ref through a PI adjuster; converting the Ud and Uq in the two-phase rotating coordinate system into a voltage Ualpha and Ubeta in the two-phase stationary coordinate system through inverted Park conversion; outputting six PWM signals through SVPWM according to a space voltage vector pulse width modulation method, and controlling the inverter; and enabling the inverter to convert a direct current into an alternating current according to the PWM signals outputted through SVPWM. The method provided by the invention is low in cost, is reliable in performance, is simple in implementation, and does not generate a big current in a detection process.

The invention relates to a silicon controlled intermediate frequency power supply circuit. Problems in the prior art that an intermediate frequency power supply adopts a pre-charging and pre-magnetizing starting mode and thus is complex in circuit structure, high in cost and low in starting success rate are solved. The power supply circuit comprises a main circuit and a starting trigger circuit. The main circuit comprises a single-phase inverter bridge which is formed by four silicone controlled rectifiers. The starting trigger circuit comprises a starting circuit and an inverter trigger circuit. The starting circuit is connected with the inverter trigger circuit which is connected onto the control ends of the silicone controlled rectifiers of the single-phase inverter. Advantages of the invention are that the inverter trigger circuit formed by phase-locked loops is adopted, and a sweep-frequency type zero voltage starting mode is adopted so that the circuit structure is simple and the starting success rate is higher.

The invention discloses a parallelization method for black-start sub-systems of a power grid without external supply, belonging to the technical field of operation and scheduling control of the power grid. Based on a black-start research scheme of the power grid, stability check of the sub-systems, voltage calculation of a parallelization circuit of the sub-systems and parallelization simulation check of the sub-systems are performed to determine a feasible parallelization route and a recommended charging direction. Starting from the sub-system with relatively highest stability level, the parallelization with the sub-system with relatively second highest stability level is firstly performed, then the sub-systems are selected according to the sequence from the high stability level to the low stability level for parallelization, the parallelization power grid range is gradually expanded, the parallelization with the remaining sub-systems is finally performed, and then the parallelization of all the sub-systems is realized to form a whole main grid frame of the power grid. According to the parallelization method disclosed by the invention, a basic method and an alternative scheme are provided for effectively restoring the main grid frame of the power grid for a scheduling and operation mechanism of the power grid, the black-start risk is avoided, the black-start success rate is improved, and the parallelization method is favorable for promoting the black-start process of the large power grid and restoring the power consumption requirements in a larger range.

The invention relates to the field of compressors, in particular to an intelligent control system and method for an electronic starting controller. An electronic switch can be correspondingly controlled according to relevant parameters in the actual operation process of a compressor, the temperature of an evaporator in a refrigerating appliance, the temperature of a refrigerating chamber and the temperature of a freezing chamber, and the energy efficiency of the compressor is greatly improved while the starting success rate of the compressor is increased. According to the technical scheme, theintelligent control system comprises a temperature sampling module, a current sampling module, a voltage sampling module, the electronic switch and a control module, and the temperature sampling module, the current sampling module, the voltage sampling module and the electronic switch are all connected with the control module. The control module is used for controlling the electronic switch according to the temperature information, the current information and the voltage information, collected by the temperature sampling module, the current sampling module and the voltage sampling module, ofthe compressor in the starting operation process so as to control starting or stopping of the compressor. The intelligent control system and method for the electronic starting controller are suitablefor intelligent control over the electronic starting controller.

The invention discloses a control method for reducing the starting load of an engine. The control method comprises the following control steps that a controller judges the starting mode of the engine, if the engine adopts an electric starting mode, and when the rotating speed N of the engine is greater than or equal to the threshold Ne1, the controller controls a generator to output electric energy, and controls the generator to supply power to the load after time delay T1; if the engine adopts a storage battery recoil starting mode, when the number of rotation turns K of an engine motor is larger than or equal to the threshold Ke1 and the rotation speed N of the engine is larger than or equal to the threshold Ne1, the controller controls the generator to output electric energy, and the generator is controlled to supply power to the load after time delay T1; and if the engine adopts a battery-free recoil starting mode, when the rotating speed N of the engine is larger than or equal to the threshold Ne2, the controller controls the generator to output electric energy, and when the number of rotation turns K of the engine motor is larger than or equal to the threshold Ke2 and the rotation speed N of the engine is larger than or equal to the threshold Ne1, power is supplied to the load after time delay T2. According to the control method, the starting load of the engine at the initial starting stage can be reduced, and the starting success rate of the engine is greatly increased.

The invention relates to the field of fuel cell vehicles, in particular to a fuel cell low-temperature rapid cold start system and method, and a vehicle. The system comprises a hydrogen inlet pipeline and an air inlet pipeline which are communicated with an electric pile, wherein a branch is arranged between the air inlet pipeline and the hydrogen inlet pipeline, one side of the branch is communicated with a pipeline between an air compressor and an air inlet throttle valve in the air inlet pipeline, the other side of the branch is communicated with a heat exchange cavity arranged in the hydrogen inlet pipeline, and a branch valve is arranged on the branch. According to the invention, cold hydrogen is preheated in a heat exchange cavity by utilizing relatively high-temperature gas at the outlet of an air compressor, so that air and hydrogen entering an electric pile are relatively high in temperature; the problem of quick cold start of the fuel cell at low temperature or extremely low temperature is solved, and the start time is shortened while the start success rate is improved; and the cold purging time is shortened, the fuel cell system does not need to wait for shutdown after parking, and the customer experience is improved.

The invention relates to a method for detecting the position of a rotor of an electrically excited synchronous motor without a sensor in a whole process based on excitation current pulse response, belonging to the field of control of motors. The problem that injection of a high-frequency signal from a stator side is limited by a frequency converter control method can be solved. The method disclosed by the invention comprises the following steps of: (1), adopting a triggering strategy of an excitation bridge circuit, such that a pulse signal having a fixed frequency is superposed on excitation current on the basis of a direct-current component, wherein the fixed frequency of the pulse signal is fh; (2), acquiring three-phase counter electromotive force line voltage of the motor, and extracting the pulse signal, the frequency of which is fh; (3), extracting envelope lines eAB_h, eBC_h and eCA_h of three-phase high-frequency signal induced electromotive force of the pulse signal, the frequency of which is fh; and (4), calculating the mechanical angle of the rotor of the synchronous motor according to the three-phase envelope lines extracted in the step (3).

The invention discloses a device and method for preparing biogas by anaerobic fermentation of high-solid-content organic solid waste, and relates to the technical field of waste recovery. The invention aims to solve the technical problems that materials in the existing high-solid-content fermentation reaction device are extremely difficult to mix, the heat and mass transfer efficiency is low, andacid accumulation is easy to cause starting failure. The device disclosed by the invention comprises a main body reaction tank, a stirring power device, a constant-temperature water tank, a submersible pump, a thermometer, a pH / ORP electrode, a gas flowmeter, a gas collection bag and a digital display control box; the main body reaction tank is provided with a water bath jacket; and the stirring power device comprises an inclined and reversed stirring bearing for increasing radial mixing in the reaction device. Anaerobic granular sludge and a high-solid-content organic solid waste substrate are added into the main body reaction tank; the temperature, the pH value and the ORP value are controlled; furthermore, the organic solid waste load is gradually increased and started; operation is carried out after success; and thereby, the biogas is obtained. The volume fraction of methane in the biogas is not lower than 45%. The device and the method can be used in the field of waste recovery and treatment.

The embodiment of the invention discloses a starting control method and device of a proxy node, equipment and a storage medium. The method specifically comprises the following steps: when the proxy node is triggered to start, trying to establish communication connection with a database, and when the proxy node is successfully connected with the database, searching the database by using a target node identity identifier of the proxy node; if a target configuration file matched with the target node identity identifier is found in the database, performing content consistency detection on the target configuration file and a local configuration file stored in the proxy node; when it is detected that difference configuration information exists between the local configuration file and the target configuration file, using the difference configuration information for updating the local configuration file; and configuring the proxy node by using the updated local configuration file, and executing a matched node processing operation after the configuration is completed. Through the technical scheme of the embodiment of the invention, automatic updating of the configuration file of the proxy node is realized, and the working efficiency of the proxy node is improved.