8results about How to "Reduce speed fluctuation" patented technology

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.

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 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.

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.