28results about How to "Reduce speed fluctuation" patented technology

The invention discloses a permanent magnet motor cogging torque analysis method considering iron core saturation. Different from an existing analysis method which does not consider iron core saturation, after the iron core saturation is considered, air gap magnetic conductance varies, a saturation coefficient is introduced, and a modulation unit is converted into stator slot and saturation coefficient combined modulation from stator slot independent modulation, so that harmonic components of air gap flux density are changed. The number of harmonic pole pairs and the rotating speed after the air gap flux density is changed are determined through Fourier decomposition, the traveling wave pair generating the cogging torque is found out according to the cogging torque generation condition of the same number of pole pairs and different rotating speeds, and effective supplement is made for an existing cogging torque analysis method.

The present invention discloses a method and system for calibrating the zero position of a permanent magnet synchronous motor with different rotation speeds, and relates to the technical field of drive motors for new energy electric vehicles. The method includes: S1: pre-positioning the rotor position and determining the initial zero position value of the resolver; S2: controlling the drive motor to a predetermined speed; S3: implementing zero current control through a controller to allow the motor speed to drop freely; S4: adjusting the zero position value of the resolver to keep the target voltage at zero; S5: recording the zero position value of the resolver at different speeds and fitting the curve to complete the calibration. According to the technical solution of the present application, high-precision resolver zero position angle calibration can be achieved without the need for additional bench resources, which reduces the complexity of the calibration process and has high practical value.

The invention discloses a motor position nonlinear disturbance static feedforward compensation method based on a system model. The method comprises the following steps: selecting a sampling period T and a closed-loop rotating speed v suitable for a system according to frequency characteristics of nonlinear disturbance in a motor; performing an open-loop experiment on the motor servo control system to obtain a discrete transfer function from a control signal to system open-loop output, and establishing a motor system model; the method comprises the steps that a motor is subjected to closed-loop operation at a low rotating speed, rotating speed, current and angle information during steady-state operation is collected, the rotating speed and the current are substituted into a discrete transfer function, an equivalent current value of nonlinear disturbance at each angle is obtained, and then the equivalent current value is negated to obtain a corresponding feedforward compensation value at each angle; carrying out filtering and weighted average on the obtained equivalent feed-forward compensation values to obtain a group of compensation value sequences with fixed compensation point intervals; and the control unit looks up a table according to an angle signal of the encoder to obtain a feed-forward compensation value of a current angle, and superposes the feed-forward compensation quantity on the control quantity at the output end of the control unit, so that feed-forward compensation for nonlinear disturbance is realized.

The invention provides a torque control method and device and a vehicle, and the torque control method comprises the steps that under the condition that the vehicle is in an engine direct drive mode, a rotating speed lag value that the rotating speed of a generator lags behind the rotating speed of an engine is obtained; when the rotating speed lag value is larger than the preset rotating speed lag value, whether the vehicle meets the torque adjusting condition or not is judged; under the condition that the torque adjusting condition is met, the target torque of the generator is determined; and determining the output torque of the engine according to the target torque of the generator and the required torque of the whole vehicle. The output torque of the engine is determined through the target torque of the generator and the required torque of the whole vehicle, the front-end rotating speed fluctuation of the generator can be limited, then the rotating speed fluctuation of the engine is restrained, the rotating speed lag value is reduced, periodic tooth knocking sound in the idling process of the generator is avoided, and user experience is improved.

The invention discloses a rotating speed control method of a permanent magnet synchronous motor. The method comprises the following steps: firstly, designing an adaptive switching expansion state observer of the permanent magnet synchronous motor, and adding the adaptive switching expansion state observer into a rotating speed loop control process; and then inputting the rotating speed of the permanent magnet synchronous motor and a q-axis current reference value output by a rotating speed ring into an extended state observer, performing adaptive parameter switching control at the same time, and outputting the rotating speed and an observed value of lumped disturbance after processing so as to continue to perform rotating speed ring control and realize rotating speed control of the permanent magnet synchronous motor. The method can improve the dynamic and steady state performance of the permanent magnet synchronous motor under inertia mismatch, weaken the overshoot of the motor in the dynamic process, greatly accelerate the response speed, reduce the rotation speed fluctuation and oscillation in the adjustment process, reduce the dependence of the parameter design of a motor control system on the rotational inertia parameter, and improve the stability of the motor control system. And meanwhile, the estimation capability of rapid change lumped disturbance is enhanced, and more complex lumped disturbance types can be dealt with.

This invention discloses a load adaptive torque control method for a permanent magnet brushless motor. The method acquires high-frequency electrical feedback and low-frequency mechanical angular velocity based on asynchronous timing updates. Asynchronous sampling lag is eliminated through time resolution matching. The active power gradient is reconstructed using discrete differential calculations, and a mechanical state observer is constructed to extract high-frequency synchronous angular acceleration. These two parameters are combined to calculate a virtual load mutation indicator factor. Based on this factor, the load condition is determined, and adaptive feedforward current generation and speed loop integral state preprocessing are triggered in parallel. Finally, the final q-axis command current is synthesized to complete closed-loop control. Furthermore, this invention utilizes a radial basis function neural network to identify the actual moment of inertia online and updates the equivalent parameters to the observer in real time. This invention solves the shortcomings of traditional control methods, such as response lag and model parameter mismatch in the early stages of load mutations, effectively suppressing transient speed drops in the motor and improving the system's anti-disturbance performance.

The invention relates to the field of motor control, and discloses a motor control method and system and an electric power-assisted vehicle, and the motor control method comprises the steps: obtaining a sensor signal in the vehicle; initial power-assisted torque acting on the motor is obtained based on the input voltage of a built-in torque sensor of the motor; filtering the initial power-assisted torque through a first filter to obtain an optimized power-assisted torque; calculating a corresponding electrical angular velocity according to the electrical angle, inputting the electrical angular velocity into the active damper for processing, and outputting a corresponding damping torque; adjusting the optimized power-assisted torque by using the damping torque to obtain an adjusted power-assisted torque; and a closed-loop control strategy is utilized to distribute the adjustment assistance torque, and a three-phase voltage control signal input to the motor is obtained so as to drive the motor to rotate. The motor control method can solve the resonance problem caused by acceleration and deceleration of the vehicle, reduce the rotation speed fluctuation of the motor, inhibit the starting acceleration of the motor, effectively improve the riding smoothness and reduce the starting abrupt feeling.

The invention discloses a blade rotating speed debugging method and system for an automobile engine cylinder cover test, computer equipment and a storage medium. The method comprises the following steps that the blade rotating speed is collected; filtering and averaging the blade rotating speed data to obtain a rotating speed average value; carrying out interval recalibration on the processed rotating speed mean value data; and outputting and displaying the calibrated blade rotating speed. According to the invention, the rotation speed fluctuation in unit time can be reduced, invalid values in the blade rotation speed are filtered out, the rotation speed is calibrated in different intervals, the influence of the blade rotation speed fluctuation on the test result is eliminated to the greatest extent, and the output rotation speed precision is improved, so that the accuracy of the test result is improved.

The invention provides a control method and device for smooth switching of multiple modes of a power plant, and belongs to the technical field of the power plant. The method comprises the steps that a combustion mode switching instruction is received, an input signal during operation in a first combustion mode is read, and fuel injection modes of the first combustion mode and a second combustion mode are confirmed respectively; the corrected fuel quantity when the first combustion mode is switched to the second combustion mode is calculated according to the equivalent energy principle, the controller calculates the initial fuel demand for maintaining the current target rotating speed according to the closed-loop rotating speed deviation, and the control law is executed when fuel injection is controlled; calculating the rotating speed fluctuation ratio of the system under the action of the initial fuel demand quantity; and comparing the multiple groups of different initial fuel demand quantity values and the corresponding rotating speed fluctuation rate results, and selecting an optimal control law to realize switching control. The thought of fuel demand quantity correction compensation is adopted, rotating speed fluctuation and fluctuation duration in the switching process are reduced, operation is easy to achieve, and meanwhile a good control effect is obtained.

The invention provides an aviation piston engine state fault monitoring and processing method which is applied to an engine numerical control system, and the engine numerical control system is mainly composed of a monitoring sensor, an electronic controller and an execution unit. The method comprises the steps that a monitoring sensor collects signals influencing main parameters of an engine and converts the signals into corresponding electric signals; the electronic controller receives an input signal of the monitoring sensor, and completes state monitoring, fault diagnosis and processing of the engine and set control for operation; the execution unit executes an electronic controller command such that the engine operates according to a predetermined control.

The invention provides a range extender power control method and device of a range extending type vehicle and the range extending type vehicle, and the method comprises the steps that the whole vehicle operation working condition of the range extending type vehicle is obtained, whether the whole vehicle operation working condition accords with all first preset working conditions or not is determined, and all the first preset working conditions are parameter value ranges of the whole vehicle operation working conditions in different specific scenes; and under the condition that the whole vehicle operation working condition accords with any first preset working condition, the power of a range extender of the range-extended vehicle is removed, and the rotating speed of the range extender is kept unchanged in the removing and filtering process. According to the method, the problems that in the prior art, the power of the range extender is rapidly cleared and recovered in a specific scene, so that the rotating speed fluctuation is too large in a short time, and the NVH performance is reduced are solved.

The invention provides a dual-controller cooperative redundancy control method for an engine, which comprises a main ECS and a standby ECS which are mutually redundant hot backup, and the main ECS and the standby ECS are mutually monitored and switched during working according to the following control method: when the system is normal, the main ECS controls the engine to operate; when the main ECS breaks down, the main ECS is switched to the standby ECS to continuously control the engine to operate; and when both the main ECS and the standby ECS fail, the engine is stopped. According to the method for controlling the engine in the cooperative redundancy mode through the double controllers, automatic switching can be carried out when the main control right breaks down, manual switching can be carried out when no fault exists, continuous operation can be carried out without shutdown under serious faults, and higher availability is achieved.

The invention discloses an engine rotating speed control system, method and device, a storage medium and a generator set. The engine rotating speed control system comprises a current sensor and a speed regulation module, and the signal output end of the current sensor is connected with the first signal input end of the speed regulation module; the current sensor is used for detecting an output current signal of the generator and transmitting the detected output current signal to the speed regulation module; the speed regulation module is used for determining an output current change signal of the generator according to the output current signal at the current moment and an output current signal at a previous moment corresponding to a preset duration before the current moment, and controlling the rotating speed of the engine according to the output current change signal and a preset rotating speed control strategy; and the rotating speed of the engine reaches the preset target rotating speed. The rotating speed of the engine is controlled based on the output current signal of the generator, and engine rotating speed fluctuation caused by sudden load change of the fuel generator set can be effectively reduced.

The embodiment of the invention provides a control method and device of a hybrid power system, a readable medium and electronic equipment. The control method of the hybrid power system comprises the steps that the vehicle speed of a vehicle is obtained; if the vehicle speed is lower than the vehicle speed threshold value, the remaining electric quantity of the vehicle is obtained; if the remaining electric quantity is higher than the electric quantity threshold value, the working state of an engine is adjusted according to the in-vehicle heat management requirement; and if the engine is in the starting state, the generator is controlled to output balance torque so as to reduce the difference value between the output torque of the engine and the load torque. According to the technical scheme, when the engine enters the self-idling working condition, the generator is controlled to output the balance torque, so that the difference value between the output torque of the engine and the load torque is reduced, and the phenomenon of gear knocking noise is improved.

This invention provides a method for controlling the power level transition of a hybrid electric vehicle engine. Based on the engine's transition threshold and the maximum adjustment capability of the high-voltage battery, the engine's power level is adjusted. As the total power demand of the drive motor and high-voltage battery changes, the engine's power level does not change immediately. Instead, it adjusts and compensates for the drive motor's power demand based on the degree of change in total power demand, prioritizing the use of the high-voltage battery to adjust and compensate, resulting in a step-like increase or decrease in the engine's power level. The advantages of this invention are that it keeps the engine's power level stable, reducing dynamic engine adjustments while meeting the drive motor's power requirements, thereby reducing dynamic fuel consumption and improving NVH performance, reducing vehicle vibration.

The present invention provides a range extender speed control method, device, vehicle and electronic equipment, wherein the method includes: obtaining the target power generation of the range extender in the current cycle time when the vehicle is idling, determining the target power generation speed based on the target power generation; controlling the speed of the range extender according to the target power generation speed, and detecting the actual speed of the range extender; if the speed standard deviation is greater than the preset standard deviation, adjusting the target power generation speed according to the preset adjustment strategy, the speed standard deviation is the standard deviation of each adjacent speed difference under the current cycle time and multiple historical cycle times, the speed difference is the difference between the target power generation speed and the actual speed, and the preset adjustment strategy is to increase or decrease the target power generation speed based on different preset speed thresholds; each time the target power generation speed is adjusted, the speed standard deviation is recalculated until the speed standard deviation is less than the preset difference, and the target power generation speed is stopped. In this way, the speed control has high accuracy and improves NVH performance.

The utility model provides a device for reducing rotating speed fluctuation of fan blades in the rotating process, which comprises a base, a mounting pipe arranged on the base, an atomizer arranged on the mounting pipe, a pressure water tank, a driving mechanism, a linkage mechanism and a stabilizing mechanism, the driving mechanism drives the pressure water tank to work through the linkage mechanism, and the pressure water tank supplies water to the atomizer. The stabilizing mechanism is used for enabling the driving mechanism to stably work; the driving mechanism comprises a mounting rod, fan blades and a box body; when the wind speed is increased, the balancing weight moves to the end, away from the mounting rod, of the sliding groove, the rotational inertia of the fan blades is increased, the speed of the fan blades is increased slowly, and the acceleration efficiency of the wind speed to the fan blades can be reduced; under the condition that the fan blades rotate at a reduced speed, the spring can pull the balancing weight to slide in the direction close to the mounting rod, so that the rotational inertia of the fan blades can be reduced, and the acceleration efficiency of the wind speed on the fan blades is improved; therefore, under the action of the balancing weight, the rotating speed fluctuation of the fan blades in the rotating process is small, and therefore stable output of the atomizer is achieved.

The invention provides an orthopedic screw disinfection box with a heating function and an orthopedic screw disinfection method. According to the orthopedic screw disinfection box with the heating function and the orthopedic screw disinfection method, the orthopedic screw disinfection box comprises a heat preservation box body, a cavity for heating is formed in the heat preservation box body, a box door is arranged on the heat preservation box body, the heating box plate is located in the cavity, and the lower side of the heating box plate is fixed to the interior of the heat preservation box body; three heating rods for disinfection are fixed in the heating box plate, and the driving device is arranged on the heating box plate. According to the orthopedic screw disinfection box with the heating function and the orthopedic screw disinfection method, the orthopedic screw disinfection box in the technical scheme realizes various disinfection effects of heat radiation, heat conduction and heat convection through the synergistic effect of all parts, so that the disinfection is more efficient and uniform. The screw is stably clamped by the clamping ring to ensure that the gravity center of the screw is always vertical to the gravity direction under the action of self weight, so that the screw is kept stable when the disinfection assembly rotates.

The invention discloses a full-speed-domain position-sensorless control method for a permanent magnet synchronous motor, relates to the technical field of motor driving control, and designs a nonlinear third-order extended state observer based on a hyperbolic tangent function to replace a PI regulator in a traditional phase-locked loop by adopting a pulsating high-frequency voltage injection method in a low-speed domain. System disturbance is estimated and compensated in real time through a third-order observer, and the angle observation precision and robustness under the dynamic working condition are improved; in a high-speed domain, a sliding-mode observer is adopted, a second-order generalized integrator is introduced to replace a traditional low-pass filter to filter a sliding-mode control law, a back electromotive force signal without phase lag is output, a phase-locked loop is cascaded to demodulate a rotor position and a rotating speed, and high-frequency jitter and phase delay are eliminated; in the full-speed-domain transition stage, a weighted switching strategy is designed, a switching interval is judged through a state machine, angle fusion is conducted through a trigonometric function vector synthesis method, the problem of periodic jumping of the angle is solved, and full-speed-domain smooth operation is achieved.

The invention relates to the technical field of generators, and particularly discloses a flywheel type distributor generator which comprises a mounting frame, an active driving mechanism is arranged at the bottom of the mounting frame, an auxiliary driving mechanism and a power generation mechanism are arranged in the mounting frame, and an electric control mechanism is arranged on the side face of the mounting frame. And the active driving mechanism is used for actively driving the auxiliary driving mechanism. Through the dual structure design of motor auxiliary driving and flywheel inertia, the problems that a traditional hand generator depends on manpower to continuously shake a handle, and operation is strenuous are fundamentally solved, the motor provides auxiliary power for a driving belt pulley under regulation and control of an electric control system, and the auxiliary power is overlapped with manual hand power, so that the power efficiency is improved. The acting force required to be applied by an operator is greatly reduced, and fatigue is not easy to generate even if the operator operates for a long time; and the inertia force of the gravity flywheel can maintain the normal operation of the transmission system and the power generation system when the manual operation stops for a short time or the applied force is reduced, and the continuous and uninterrupted manual force application is not needed, so that the labor intensity is obviously reduced.

The utility model discloses a kind of electrically-driven centrifugal oil-gas separators, hollow shaft passes through motor, and the end of hollow shaft is fixed with motor;First cavity and oil inlet hole that pass through with first cavity are equipped on oil inlet main body, and the other end of hollow shaft is located in first cavity;First through-hole is equipped on oil-gas separation seat along with axial, and oil discharge hole that pass through with first through-hole is equipped on the circumference of oil-gas separation seat;Oil-throwing disc is fixed with hollow shaft, and the circumference of hollow shaft is equipped with first oil-throwing hole, and the circumference of oil-throwing disc has second oil-throwing hole for cooperating with oil discharge hole, and first oil-throwing hole and second oil-throwing hole pass through;Connecting seat is sleeved on hollow shaft, and motor is fixed with one end of connecting seat, and the other end of connecting seat is fixed with the other end of oil-gas separation seat.The utility model has the advantages of high separation efficiency and reducing power loss.

The utility model discloses an engine crankshaft structure with high load capacity, which particularly relates to the field of engine crankshafts and comprises a main journal, a counterweight is arranged on one side of the main journal, a connecting rod journal shaft is arranged on one side of the counterweight, and a strengthening layer is arranged on the outer surface of the main journal. A wear-resistant layer is arranged on the outer surface of the connecting rod neck shaft, reinforcing ribs are arranged on the outer walls of the two sides of the crank, a sliding way is arranged on the side, away from the connecting rod neck shaft, of the balance weight, a sliding block is embedded in the sliding way, a connecting frame is connected to one side of the sliding block, and a centrifugal part is connected to the end, away from the sliding block, of the connecting frame. The supporting performance and the abrasion resistance of the connecting rod neck shaft are improved through the strengthening layer and the abrasion-resistant layer, the situation that due to long-time friction, the fit clearance is increased, and the sealing performance and the performance of an engine are affected is avoided, restoring torque can be applied to the crankshaft through the centrifugal part, and therefore the smooth performance of the engine is optimized.

The application discloses an integrated water ring vacuum pump with a crushing function, and relates to the technical field of water ring vacuum pumps.The device integrates the functions of crushing, pumping, sealing and cooling in the same pump body.The bearing part is sequentially bolted with a transparent observation plate and a multistage shell to form a front crushing cavity and a rear working cavity.The transmission part adopts an outer rotor structure, the rotor suspends an arm fixed cutter and a spiral pump blade, and coaxially sleeves a fixed cutter.The sewage containing sundries enters the crushing cavity through an inlet pipe, is axially and radially sheared and ground by the passive cutter and the fixed cutter, is immediately pumped into the working cavity by the spiral pump blade to establish a water ring vacuum, and is finally discharged through an outlet pipe.The rotor is directly immersed in water for cooling, and an external fan or a circulating water circuit is not needed.The application cancels the traditional split arrangement of a pump, a coupling, a motor and a front crusher, has the advantages of compact structure, small occupation, anti-winding, anti-clogging, low temperature rise, small vibration and noise, convenient maintenance and the like.

The invention relates to a high-speed data acquisition, storage and playback device. The device comprises a high-speed AD module; a storage module; a high-speed DA module; the computer is provided with a central processing unit; wherein the high-speed AD module is in communication connection with the storage module, the storage module is in communication connection with the computer, and the storage module is in communication connection with the high-speed DA module; wherein the first FPGA is configured to directly control data interaction between the first high-speed communication interface and the storage module and analog-digital signal conversion of the high-speed AD converter in a mode of bypassing the central processing unit; the second FPGA is configured to directly control the access to the DDR cache and the data interaction between the disk array and the second and third high-speed communication interfaces and the network interface in a manner of bypassing the central processing unit; and the third FPGA is configured to directly control data interaction between the fourth high-speed communication interface and the storage module and digital-analog signal conversion of the high-speed DA converter in a manner of bypassing the central processing unit.

The invention relates to the technical field of permanent magnet synchronous motor control, in particular to a zero-crossing friction torque compensation method and system for a reaction flywheel, and the method comprises the following steps: constructing a friction model which is continuous and differentiable; constructing an extended state observer; acquiring a first angular velocity of a reaction flywheel and a feedback current signal of the permanent magnet synchronous motor to the extended state observer, and calculating by the extended state observer to obtain a second angular velocity and system lumped disturbance; the friction model calculates friction torque according to the second angular velocity; calculating a feed-forward compensation vector in combination with the friction torque and the system lumped disturbance; performing feed-forward compensation according to the feed-forward compensation vector; according to the method, the improved friction torque model and the extended state observer are utilized, and the zero-crossing friction torque is accurately calculated and compensated by accurately estimating the rotating speed and calculating the friction torque.

This invention relates to the field of motor control technology, specifically to a method and system for mitigating open-circuit faults in a three-phase induction motor. The method includes: obtaining a speed setpoint and the actual speed to form a speed deviation; inputting the speed deviation into a composite speed controller in a closed-loop V / f control structure to generate a frequency adjustment quantity; determining a target frequency command based on the frequency adjustment quantity and pole number conversion relationship, and generating a stator voltage amplitude command under a constant V / f ratio; obtaining the synchronous electrical angle through integration and generating a modulation signal; performing pulse width modulation based on the modulation signal to drive the three-phase inverter to output three-phase drive voltage; and when a stator phase open circuit causes a double-frequency disturbance in the dq coordinate system, using a resonant adjustment branch for tracking compensation to reduce speed fluctuations and electromagnetic torque pulsation, maintaining continuous motor rotation. This invention solves the problem of high control system complexity in existing induction motors due to reliance on independent fault detection and complex fault-tolerant switching mechanisms.

This invention provides a dynamic coordinated control method and system for mode switching in methanol-electric hybrid power ships. The upper-level controller acquires real-time status information such as the ship's propeller load torque, methanol engine speed, permanent magnet synchronous motor speed, and the speed difference between the driving and driven ends of the clutch, and determines whether mode switching needs to be triggered. When switching is required, the upper-level controller generates target torques for the engine, motor, and clutch, sending the first two directly to the corresponding actuators, while sending the clutch target torque to the lower-level controller. Upon receiving the clutch target torque, the lower-level controller first calculates the clutch target oil pressure using the torque-oil pressure mapping relationship, then calculates the quasi-steady-state control current component, dynamic feedforward compensation current component, and nonlinear error feedback correction current component, respectively. Finally, the three are added together to obtain the drive current, which is output to the clutch actuator, achieving precise closed-loop control of the clutch oil pressure.

The application provides a rotating speed stabilizing device, a compressor and a refrigerator. The rotating speed stabilizing device comprises: a counterweight; a connecting piece for connecting with a rotor of the compressor, the connecting piece having a connecting state of being connected with the counterweight and a separation state of being separated from the counterweight, and the connecting piece is switchably arranged between the connecting state and the separation state. The rotating speed stabilizing device solves the problem of low rotating speed stability of the transmission assembly in the compressor in the prior art.