445 results about "Tachometer" patented technology

The invention provides a rotating speed control method for a brush motor, and relates to the technical field of data processing, and the method comprises the steps: collecting the voltage, current and rotating speed of the brush motor, calculating the change rates of the voltage, current and rotating speed at adjacent moments, constructing a corresponding change rate sequence, dividing the change rate sequence into a plurality of window intervals, and in each window interval, determining the rotating speed of the brush motor; calculating a delay amount group, judging whether the brush motor has response abrupt change or not, recording corresponding response abnormal moments, extracting rate evolution data corresponding to the response abnormal moments, calculating a weighted average rotating speed change rate, and obtaining a predicted rotating speed offset sequence; and according to a difference value between the predicted rotating speed offset sequence and the real-time rotating speed, calculating a compensation voltage increment, generating a compensation voltage signal, and ensuring that the rotating speed of the motor is stable. The rotating speed of the brush motor can be predicted, and the stability of the rotating speed is ensured through voltage correction.

The invention relates to the technical field of industrial automation control, and particularly discloses a rotating speed detection and closed-loop control system based on photoelectric sensing and a PLC, and the system comprises at least one rotating body which is a rotating speed controlled object, and the surface of the rotating body is provided with a configurable number of reflection mark areas or speed measurement holes; the proximity photoelectric switches are in one-to-one correspondence with the rotating bodies, are aligned with the reflection mark areas or the speed measurement holes, and are used for detecting rotation information of the rotating bodies and generating original pulse signals; a high-speed counter input port of the PLC is electrically connected with signal output ends of the proximity photoelectric switches, and a pulse preprocessing module, a rotating speed calculation module, a deviation processing module, a control algorithm module and a signal adaptation module are arranged in the PLC. The PLC and the proximity photoelectric switch which are widely applied in the industrial field and high in popularity rate are adopted as core technical components, and expensive special servo controllers, encoders and other devices are not needed, so that the hardware purchase cost of the system is greatly reduced.

The invention provides a dynamic hand feedback adjusting method and device, a storage medium and an electronic device.The method comprises the steps that the steering wheel input angle, the wheel response angle and the actual steering wheel rotating speed of a steer-by-wire vehicle are dynamically detected; calculating an angle difference between the steering wheel input angle and the wheel response angle; calculating dynamic feedback torque according to the angle difference and the actual rotating speed of the steering wheel; and applying a reverse force to a steering wheel of the steer-by-wire vehicle based on the dynamic feedback torque. Through the embodiment of the invention, the technical problem that the vehicle is unstable due to the angle difference between the actual turning angle of the steering wheel and the actual turning angle of the wheels in the prior art is solved, the dynamic perception of a driver to the vehicle is enhanced, and the driving safety, the control experience and the stability of the vehicle are improved.

The invention relates to the field of aero-engine testing, in particular to an aero-engine rotating speed signal generator and a control method, and the system comprises the steps that a main control module receives a test demand input by a user, selects and determines the model, matching frequency, voltage and phase parameters of a tachometer sensor needing to be simulated based on the test demand, and transmits the parameters to a DSP processor; the DSP processor receives parameters issued by the main control module and generates an SPWM signal through a timer; the timer is configured to be in a circulation mode, and the period of the PWM signal is changed by changing the initial value of the timer; the inversion module converts the isolated SPWM waveform into a three-phase alternating current signal and outputs the three-phase alternating current signal; and the detection module measures data of the three-phase alternating current signal output by the inversion module in real time and feeds back the data to the main control module to form closed-loop control. Test errors caused by performance errors of the sensor are avoided, and the actual performance of the tachometer indicator can be evaluated more accurately.

The invention relates to the technical field of tire detection, in particular to a method for identifying abnormal vibration of a tire through color difference of an automobile tire tread, which comprises the following steps: generating a point cloud picture; generating a first tire surface height point cloud picture at the first rotating speed; generating a first visual point cloud picture and determining an abnormal vibration level; dividing detection intervals, wherein n detection point sets are configured in each detection interval; generating a second tire surface height point cloud picture at a second rotating speed; reducing the rotating speed of the tire at a preset rate, calculating a stability score, and judging whether the stability of the detection device meets requirements or not; and in response to the satisfaction, rendering the tire surface to generate a second visual point cloud picture, and determining an abnormal vibration level. According to the method, the height difference of the tire surface height at each detection point position is calculated, and the tire surface is rendered according to the height difference and the preset color matching mechanism, so that the vibration condition caused by the tire surface height can be intuitively and visually displayed.

The invention discloses a material taking flow control method for semi-closed spiral material taking equipment, relates to the technical field of material conveying, and is used for controlling the semi-closed spiral material taking equipment. The target conveying amount of the horizontal material collecting mechanism and the target rotating speed of rotating blades of the horizontal material collecting mechanism are set, and the target filling rate of the horizontal material collecting mechanism is calculated based on the target conveying amount and the target rotating speed; according to the flowability of the target material, initial state adjustment of the semi-closed spiral material taking equipment is completed, and a theoretical current value of a driving motor of a horizontal material collecting mechanism in the initial state is obtained through calculation; and dynamically adjusting the rotating speed of the rotating blade of the horizontal material collecting mechanism based on current value comparison. The semi-closed spiral material taking device can be intelligently controlled, and stable material taking operation is achieved.

In a hydraulic drive system used for an electrically driven hydraulic work machine that drives a hydraulic pump by an electric motor and supplies a hydraulic fluid to plural actuators to carry out work, the power consumption of the hydraulic pump is kept from exceeding a value decided in advance. For this purpose, a controller calculates target power to be consumed by the hydraulic pump on the basis of the capacity of the hydraulic pump, the delivery pressure of the hydraulic pump sensed by a pressure sensor, and a target revolution speed of the electric motor, and limits the target revolution speed of the electric motor in such a manner that the target power falls within a range of the maximum allowable power.

The invention provides a vehicle drifting control method, device and equipment, a computer readable storage medium and a computer program product. The method comprises the steps that based on target state information and actual state information of a vehicle, a first slip rate component and a second slip rate component are obtained, the first slip rate component is used for slip angle stability control, and the second slip rate component is used for yaw velocity control; determining a left rear wheel slip rate target and a right rear wheel slip rate target based on a basic slip rate target, the first slip rate component and the second slip rate component; and rotating speed calculation is conducted based on the actual state information, the left rear wheel slip rate target and the right rear wheel slip rate target, and the vehicle is controlled based on the obtained left rear wheel rotating speed target and the obtained right rear wheel rotating speed target. According to the invention, a driver can maintain stable drifting of the vehicle only by operating the steering wheel and the accelerator.

The invention discloses a deep-sea robot driving motor current-sharing heat balance method, which comprises the following steps of S1, constructing a differential equation set for describing input and output characteristics of a motor, and covering mechanical and electrical parts; s2, measuring the current and the rotating speed of each armature in real time, and calculating a current difference value; s3, constructing a parameter matrix and a solution matrix for calculating a control gain, and establishing a weight matrix and an adjustment coefficient for dynamically calculating a control signal; s4, updating the control weight matrix in real time according to the current difference value, iteratively updating the solution matrix, calculating a control voltage signal and applying the control voltage signal to each armature; the current-sharing heat balance method is based on the current signals of the armatures of the motor, the deviation signals are calculated, the control voltage is dynamically adjusted, it is ensured that the rotating speed of the motor accurately tracks the target signals, it is also ensured that currents of the armatures tend to be the same, heat balance between the armatures is achieved, and stable operation of the motor is ensured.

The invention belongs to the technical field of mixing equipment, and particularly relates to a non-intrusive homogenizer operation process abnormity monitoring method and system, and the method comprises the steps: calculating the mechanical angular acceleration according to the real-time rotating speed of a motor shaft end; on the basis of a pre-constructed inverse dynamic model, according to the motor orthogonal axis current, the motor shaft end real-time rotating speed and the mechanical angular acceleration, a rheological resistance characteristic index is calculated; processing the rheological resistance characteristic index by using a singular spectrum analysis algorithm, and extracting a trend line of the rheological resistance characteristic index through construction of a trajectory matrix, singular value decomposition and diagonal averaging operation; the information entropy of the first-order difference sequence of the trend line is calculated to serve as the mixing stability entropy, and the mixing end point of the operation process of the homogenizer is judged according to the convergence condition of the mixing stability entropy relative to the reference entropy, so that anomaly monitoring of the operation process of the non-intrusive homogenizer is achieved. According to the invention, abnormity monitoring and end point determination of the mixing process of the homogenizer are realized.

The invention discloses a coal-fired power plant belt conveyor driving gear box bearing fault diagnosis method, which relates to the field of fault diagnosis and evaluation, and is used for extracting gear box bearing fault features based on an order tracking analysis method of tachometer-free instantaneous rotation frequency estimation. The method specifically comprises the following steps: S1, obtaining an instantaneous rotation frequency ridge line through the time frequency distribution of a vibration signal, carrying out the rotation frequency estimation of a rotating shaft, and improving the precision of the instantaneous rotation frequency ridge line through an improved multi-source ridge line fusion algorithm; and S2, extracting bearing fault feature order information by using a calculation order tracking COT algorithm, and adaptively processing a bearing fault diagnosis problem of the driving gearbox of the belt conveyor. According to the bearing fault diagnosis method for the rubber belt conveyor driving gearbox of the coal-fired power plant, the bearing inner ring fault is successfully diagnosed, and the feasibility of a bearing fault diagnosis strategy for the rubber belt conveyor driving gearbox is verified.

The invention belongs to the technical field of motor control, and particularly relates to a motor three-phase counter electromotive force phase sequence detection circuit and a running direction judgment device. The phase sequence detection circuit comprises a comparison circuit and further comprises a tachogenerator coaxially connected with the motor to be detected, and the output end of the tachogenerator is electrically connected with the input end of the comparison circuit so that the phase sequence of the three-phase counter electromotive force of the motor to be detected can be obtained through the three-phase voltage output by the tachogenerator through the comparison circuit. The three-phase counter electromotive force of the to-be-tested motor is directly detected through the tachogenerator coaxially connected with the to-be-tested motor. The rotor of the tachogenerator rotates along with the rotation of the motor to be tested, and the rotor of the tachogenerator cuts magnetic lines in the operation process, thereby generating the three-phase counter electromotive force of the motor to be tested. The technical problem that in the prior art, when ground voltage detection is not accurate due to external interference, detected counter electromotive force is not accurate, and then the motor control effect is affected is solved.

The embodiment of the invention discloses a vehicle speed regulation control method which comprises the following steps: calculating an engine speed difference according to a first engine speed and a second engine speed; calculating an engine target rotating speed difference according to the first engine target rotating speed and the second engine target rotating speed; according to the engine rotating speed difference and the engine target rotating speed difference, the speed difference change rate of a first preset time period between the first moment and the second moment is calculated; calculating an error adjustment torque according to the speed difference change rate and the equivalent rotational inertia of the vehicle; and controlling an automatic transmission of the vehicle to operate according to the error adjusting torque. Therefore, error correction is carried out on the control torque of the automatic transmission according to the rotating speed difference of the clutch in one time period, the automatic transmission is controlled with the appropriate torque when the gear changes, gear shifting impact and pause caused by errors of the clutch are reduced, and the driving experience of a vehicle is improved.

The invention relates to the technical field of power control, and discloses a main hydraulic power setting method and device of an excavator, the excavator and a storage medium. The actual power of an engine cooling system is calculated based on the current engine water temperature or the engine intercooling temperature, the actual air conditioner refrigeration power is determined based on the air conditioner refrigeration state, and then the difference between the maximum engine power and the actual power of a hydraulic cooling system, the actual power of the engine cooling system, the actual air conditioner refrigeration power and the preset engine reserved power is obtained; and finally, the target main hydraulic power is applied to a main pump corresponding to the excavator to operate, so that it is guaranteed that the hydraulic main power is in a better state, and the engine power is brought into play to a greater extent.

The invention provides an explosion-proof motor bearing fault detection method based on frequency domain sparse variational mode extraction, and the method comprises the following steps: S1, collecting a vibration signal of a detected device through a vibration sensor, then intercepting the vibration signal in unit time, and carrying out the mean value removal; s2, constructing a frequency domain sparse variational mode extraction model, deducing an iterative solution algorithm of the model, and extracting fault features from the vibration signals through the iterative solution algorithm; s3, analyzing the time domain waveform and the envelope spectrum of the fault features, calculating the theoretical fault feature frequency of the bearing according to the structural parameters and the rotating speed of the bearing, comparing each spectral line with the theoretical fault feature frequency of the bearing, and determining the fault type of the bearing according to the matching result; weak fault features can still be accurately extracted under multiple interference components, accurate detection of the bearing fault of the explosion-proof motor is achieved, and operation safety of a whole mechanical system is ensured.

1. Name of the Design Product: Graphical User Interface for Displaying Control and Indication Status of a Vehicle for an Electronic Device. 2. Use of the Design Product: For an electronic device. 3. Design Key Points of the Design Product: Lies in the graphical user interface. 4. Picture or Photograph that Best Illustrates the Design Key Points: The front view of Design 1. 5. Design 1 is designated as the basic design. 6. Use of the Graphical User Interface: This graphical user interface is used to display the control and indication status of a vehicle. Among them: The front view of Design 1 shows the display interface of the tachometer of a Panamera G3 EXC model car, with the pointer extinguished and a gray dial; The change status diagram of Design 1 shows the display interface of the tachometer and the driving range meter of a Panamera G3 EXC model car. When the power mode is started, the pointer points to 0 and the dial is gray; The front view of Design 2 shows the display interface of the tachometer of a Panamera G3 EXC model car, with the pointer extinguished and a red dial; The change status diagram of Design 2 shows the display interface of the tachometer and the driving range meter of a Panamera G3 EXC model car. When the power mode is started, the pointer points to 0 and the dial is red; The front view of Design 3 shows the display interface of the tachometer of a Panamera G3 EXC model car, with the pointer extinguished and a dark green dial; The change status diagram of Design 3 shows the display interface of the tachometer and the driving range meter of a Panamera G3 EXC model car. When the power mode is started, the pointer points to 0 and the dial is dark green; The front view of Design 4 shows the display interface of the tachometer of a Panamera G3 Turbo model car, with the pointer extinguished and a gray dial; The change status diagram of Design 4 shows the display interface of the tachometer and the driving range meter of a Panamera G3 Turbo model car. When the power mode is started, the pointer points to 0 and the dial is gray; The front view of Design 5 shows the display interface of the tachometer of a Panamera G3 Turbo model car, with the pointer extinguished and a red dial; The change status diagram of Design 5 shows the display interface of the tachometer and the driving range meter of a Panamera G3 Turbo model car. When the power mode is started, the pointer points to 0 and the dial is red; The front view of Design 6 shows the display interface of the tachometer of a Panamera G3 Turbo model car, with the pointer extinguished and a dark green dial; The change status diagram of Design 6 shows the display interface of the tachometer and the driving range meter of a Panamera G3 Turbo model car. When the power mode is started, the pointer points to 0 and the dial is dark green; The front view of Design 7 shows the display interface of the tachometer of a Panamera G3 Turbo S PHEV model car, with the pointer extinguished; The change status diagram of Design 7 shows the display interface of the tachometer and the driving range meter of a Panamera G3 Turbo S PHEV model car. When the power mode is started, the pointer points to 0. 7. Human-computer interaction method of the graphical user interface: For each design, the main view represents the state where the vehicle is not started. As the user starts the vehicle, the main view changes to the corresponding changed state diagram. 8. Other circumstances that need to be explained: Designs 1, 2, 3, 4, 5, and 6 claim protection for colors.

The invention provides a self-adaptive control method and system for an extrusion screw of a plastic extruder, and relates to the technical field of plastic recovery and regeneration, and the method comprises the following steps: collecting operation data of the plastic extruder; calculating a change trend and an effective value according to the machine head melt pressure; a three-level partition model is constructed, a pressure deviation value is calculated based on the effective value and the target reference value, and a pressure control area is generated according to a comparison result of the pressure deviation value and a pressure threshold value; performing consistency judgment on the change trend and the pressure demand direction to generate an adjustment coefficient, and performing step length correction by combining a pressure control region and a motor load current to generate a rotating speed adjustment amount; the to-be-executed rotating speed of the screw is calculated in combination with the real-time rotating speed of the screw, acceleration limiting processing is carried out to generate the target rotating speed of the screw, and the target rotating speed is coded into a control instruction to be sent to the driving unit, so that the self-adaptive control effect of the extrusion screw can be achieved, and false pressure fluctuation caused by material hardness change is effectively prevented; the extrusion stability and the response speed are obviously improved.

The invention relates to the technical field of design optimization, in particular to a control design optimization method and system for a permanent magnet synchronous motor. The method comprises the following steps: obtaining and measuring a stator three-phase voltage value and a current value of the PMSM and a motor rotating speed in real time; constructing a d-q axis motor equivalent circuit model, and calculating an available boundary curve of the voltage of the weakening area by combining the three-phase voltage value of the stator and the rotating speed of the motor; determining a dynamic safety margin coefficient of a weakening area voltage-current working area based on the weakening area voltage available boundary curve; judging the motor rotating speed of the permanent magnet synchronous motor; by introducing voltage-current working area modeling and a dynamic safety margin coefficient, accurate current control and adaptive inverter compensation of the PMSM in a weak magnetic area are realized, and the problems of poor stability, insufficient voltage margin and incomplete compensation in traditional high-speed control are solved.

The invention relates to a rotation speed sensor automatic calibration system capable of increasing disturbance, which comprises a tested gear, a gear disc, a driving motor, a rotating shaft, a rotation speed sensor, a tachometer, a data acquisition unit, a main control unit and a disturbance applying mechanism, the disturbance applying mechanism comprises a synchronous ring body, a thermal bimetallic strip, a simulation tooth, a connecting rod, an electric control trolley, a locking mechanism, a heating piece, a first electric push rod and a first abutting plate, the heating piece can be brought to the inner sides of different storage grooves through the moving trolley, the heating piece emits heat to enable the thermal bimetallic strip in the storage grooves to deform, the simulation tooth is driven to be retracted into the storage grooves, and the simulation tooth is driven to rotate; a tooth missing state is simulated, when the main control unit sends a control instruction to the driving motor, the driving motor can drive the synchronous ring body and the tested gear to rotate through the rotating shaft, the synchronous ring body is in the tooth missing state and can apply vibration disturbance, and the rotating speed, collected by the rotating speed sensor, of the tested gear can be transmitted to the main control unit for comparison and calibration; the calibration accuracy can be improved by applying different disturbances.

The invention belongs to the field of aero-engine test and fault diagnosis, relates to an engine rotating part fault positioning technology, and provides a rotating part fault feature recognition method and system in a tachometer-free scene, and the method comprises the steps: obtaining a vibration signal and a theoretical fault feature order of a rotating part; obtaining an instantaneous rotating frequency signal of the rotating part through the constructed non-convex linear transformation regular term sparse representation model; carrying out iterative solution through the constructed sparse representation model to obtain a fault characteristic signal of the rotating part; obtaining an order envelope spectrum according to the instantaneous frequency conversion signal and the fault characteristic signal; and performing health assessment and fault identification on the rotating part according to the order envelope spectrum and the theoretical fault feature order. The method can solve the problem that the variable-speed fault of the rotating shaft part of the aero-engine cannot be recognized in a non-rotating-speed scene. Through the implementation of the method, the fault of the rotating shaft part of the aero-engine is effectively identified, and technical support is provided for troubleshooting in an aero-engine test.

The invention relates to the technical field of vehicle operation management, in particular to an anti-slip method, system and device for vehicle hill starting and a medium. The method comprises the steps that the rotating speed value and gear signals of an output shaft of a vehicle are continuously monitored; calculating an output shaft rotating speed real-time change rate based on the output shaft rotating speed; continuously judging whether the current vehicle running state meets a predefined slope starting working condition identification condition or not based on the gear signal of the current period, the rotating speed of the output shaft and the real-time change rate of the rotating speed of the output shaft, executing anti-slope-sliding operation after meeting the predefined slope starting working condition identification condition, and continuously judging whether the current vehicle running state meets a predefined anti-slope-sliding function exit condition or not; and after meeting, quitting the anti-slip operation, and circularly executing. By continuously monitoring and filtering the rotating speed and the gear signal of the output shaft of the vehicle, the hill starting working condition can be accurately identified and the anti-slip control can be executed without additional hardware, so that the system cost is effectively reduced and the function false triggering is avoided.

The utility model discloses an equipment health diagnosis early warning system based on carrier roller rotating speed detection, which comprises a mounting seat and a carrier roller piece, the end part of the outer wall of the carrier roller piece is rotatably connected with the mounting seat, a detection assembly is arranged on one side, deviating from the carrier roller piece, of the mounting seat, and a mounting shell is fixedly mounted on one side of the mounting seat. The reflective strip is fixedly mounted at the end of the outer wall of the carrier roller piece, the photoelectric tachometer is mounted in the mounting shell, the detection direction of the photoelectric tachometer is perpendicular to the axis of the carrier roller piece, and the alarm is arranged on one side of the mounting shell. According to the carrier roller detection device, the mounting base, the carrier roller piece and the detection assembly are used in cooperation, under the condition that the photoelectric tachometers and the reflective strips are used in cooperation, the rotating speed and the motion stable state of the carrier roller piece can be detected, and when the carrier roller piece shakes, the alarm can give an early warning in advance; and the photoelectric tachometer and the alarm can be directly disassembled and maintained by disassembling and assembling the shell.

The invention relates to a rotary machine composite fault detection method and system under a time-varying working condition, and belongs to the technical field of rotary machine fault diagnosis. The method comprises the steps of collecting a non-stationary vibration signal under a variable speed working condition, fusing a third-order Renyi entropy and kinematics prior to construct an adaptive time-frequency enhancement model, and outputting weighted time-frequency distribution; global optimization is carried out through a priori constraint Viterbi algorithm, and an instantaneous frequency ridge line is extracted under the condition of no rotating speed sensor; performing angular domain resampling by taking the ridge line as a phase reference, and converting a non-stationary signal into an angular domain stationary signal; constructing an extended difference mode decomposition convex optimization model, and iteratively solving an optimal difference spectrum; and determining a frequency spectrum segmentation threshold value based on self-adaptive change point analysis, performing decoupling separation and time domain reconstruction on the optimal difference spectrum, and completing composite fault diagnosis through feature comparison. The method does not need an external tachometer, can adaptively extract and separate the composite fault features under the variable speed working condition, is high in diagnosis accuracy, and is good in engineering application value.

A compressor control method and apparatus, a device and a storage medium. The control method comprises: acquiring a demand of an evaporator for refrigeration; on the basis of the demand for refrigeration, determining a first compressor rotating speed; acquiring evaporation temperature error data of the evaporator; on the basis of the evaporation temperature error data, determining a second compressor rotating speed; according to the first compressor rotating speed and the second compressor rotating speed, calculating a target compressor rotating speed; and, on the basis of the target compressor rotating speed, controlling a compressor. The control method enables rotating speeds of compressors to be closer to rotating speeds of actual refrigeration requirements and effectively reduces errors, allowing air conditioning systems to exert the optimal efficiency.

The invention relates to the technical field of fan control, and discloses a fan rotating speed adjusting method and system based on a dynamic pollution load. The method comprises the following steps: collecting a target PM2.5 concentration, a target VOC concentration and a target microorganism concentration of each monitoring point, and calculating a comprehensive pollution load index of each monitoring point; traversing boundary critical points in all the monitoring points based on the comprehensive pollution load index and generating a boundary identification vector; the real-time pressure drop of the air inlet side and the air outlet side of the filter element in each fan is collected, and the pressure difference compensation gain is calculated; calculating a target reference rotating speed for all monitoring points in the responsible sector of each fan; and calculating the average pollution load index of the responsible sector of each fan, executing fuzzy reasoning to obtain a rotating speed increment, and generating a PWM duty ratio according to the target reference rotating speed and the rotating speed increment to drive each fan. The technical problems of space pollution response lag and energy consumption imbalance are solved, and the performance of the air purification system is improved.

The utility model discloses a speed measuring device of rotating equipment. Comprising a cylindrical shell, a displacement compensation structure, a tachometer wheel and a supporting bearing, wherein one end of the cylindrical shell is open, and a shaft hole is formed in the center of the other end of the cylindrical shell; the displacement compensation structure is arranged in the shell, and one end of the displacement compensation structure is connected with a measured rotating shaft; the tachometer wheel is inserted into the shell from the shaft hole and is connected to the other end of the displacement compensation structure; and the speed measurement sensor is arranged on the outer side surface of the shell and corresponds to the speed measurement wheel. The speed measuring device of the rotating equipment can be easily installed on the supporting shell of the rotating shaft to be measured, and the speed measuring device can adapt to the multi-direction movement of the rotating shaft to be measured in the axial direction and the radial direction through the arrangement of the displacement compensation structure. A fixed gap can be always kept between the tachometer wheel and the tachometer sensor under the condition that the displacement of the measured rotating shaft is relatively large, and the accuracy of a rotating speed signal is ensured, so that the measurement precision is ensured.

The invention relates to a dual-motor hill-holding control method and device and a vehicle control system, when a vehicle is in a slope sliding state, a first motor is controlled to be adjusted from the current rotating speed to zero rotating speed, and a target output torque is calculated according to the current motor rotating speed; the sum of the output torque of the first motor and the output torque of the second motor is controlled to be equal to the target output torque, so that the vehicle is stressed in a balanced mode to maintain the slope holding state, one motor conducts rotating speed loop control, and the other motor compensates the remaining needed torque according to the torque output by the motor conducting rotating speed loop control; and through division of labor of speed control and torque control, a dynamic game generated when speed rings of the double motors are controlled at the same time is eliminated, it is ensured that the hill-holding function is stable, and therefore cooperative hill-holding control over the double motors is achieved. The method does not need to depend on high-cost hardware such as an ESP or an EPB, and only needs software logic of a motor controller to achieve slope holding.

The invention relates to a fan field dynamic balancing device which comprises a motor, a coupler, a left bearing seat, a rotor shaft, an impeller, a right bearing seat, a swivel joint, a swivel joint oil inlet pipe, an oil tank, a left vibration sensor, a vibration analyzer, a right vibration sensor and a tachometer. The motor drives the rotor shaft and the impeller to rotate at a rated rotating speed through the coupler, the left bearing seat and the right bearing seat are provided with a left vibration sensor and a right vibration sensor respectively, the left bearing seat and the right bearing seat are used for fixing the rotor, and the vibration condition of the rotor is extracted through the vibration sensors installed on the bearing seats. Vibration signals extracted by the vibration sensor are transmitted to the vibration analyzer through a wire, the multi-oil-way swivel joint is additionally arranged at the free side shaft end of the fan, and by controlling opening of each oil way of the swivel joint, adding of counter weights of each impeller, namely different angles, is achieved.

The invention relates to the field of mower control systems, and discloses a gasoline mower cutter soft start control system which comprises an engine, a spark plug, a cutter and an electromagnetic clutch coil which are arranged in a mower shell. The input signal acquisition module, the level conversion and shaping circuit, the single chip microcomputer and the power driving execution module are electrically connected with the spark plug. The single chip microcomputer comprises a rotating speed calculation unit and a core control unit, the rotating speed calculation unit is used for calculating the rotating speed of an engine according to digital pulses output by the level conversion and shaping circuit, and the core control unit selects a soft start control parameter set according to the rotating speed of the engine and outputs a multi-stage PWM control signal to the power driving execution module; the working current of the electromagnetic clutch coil is adjusted by the power driving execution module in stages, soft starting of the cutting knife from a static state to a working rotating speed is achieved, and mechanical impact and vibration in the starting process are reduced.

The application discloses a power following compensation correction control method for a range extended electric vehicle, and steps are as follows: S1, power correction: initial demand power generation is calculated, and final power generation is obtained by correction according to current atmospheric pressure, SOC and load compensation; S2, speed correction: first correction power generation speed and power generation torque between maximum and minimum values are calculated, second correction power generation speed and simulation speed are calculated and accumulated, and final power generation speed is obtained together with preset maximum power generation speed; S3, torque correction: initial power generation torque is calculated according to final power generation and final power generation speed, feedforward correction torque is calculated according to feedforward compensation control, and finally, final power generation torque is obtained. The application also discloses a power following compensation correction control device and a computer system for the range extended electric vehicle. The application can ensure good driving following property under the premise of optimal fuel consumption and NVH performance, and can be widely applied in the field of the range extended electric vehicle.