53results about How to "High speed control accuracy" patented technology

A compressor system according to the present invention utilizes direct rotational input from a permanent magnet motor to generate compressed air. The permanent magnet motor is mounted directly to an air screw compressor. The rotational input is provided by the permanent magnet motor to the air screw compressor without a gear train. The permanent magnet motor and associated variable speed drive controls the rotational speed of the permanent magnet motor and hence the screw compressor. Differing motors may selectively mount, and provide rotational input to, the air screw compressor.

The invention relates to the technical field of rail traffic vehicle collision experiments, in particular to a rail vehicle collision experiment platform and a rail vehicle collision experiment method. By applying a driving motor, a braking motor, a detector and a controller, automated speed monitoring, accelerating and braking are realized in the process of a rail traffic vehicle collision experiment; especially by arranging the braking motor, braking for deceleration can be realized accurately when acceleration needs to be stopped. In the prior art, an actual locomotive is controlled through experimenting personnel to speed up a test vehicle in the process of the rail traffic vehicle collision experiment, time delay is generated in speed data receiving response and locomotive operation through artificial operation, and the actual locomotive cannot reach experiment accuracy requirements on system response sensitivity to acceleration and parking. Compared with the prior art, the rail vehicle collision experiment platform and the rail vehicle collision experiment method have the advantage that accuracy on speed control of the test vehicle in the process of the rail traffic vehicle collision experiment is improved remarkably. In addition, a long experiment rail needed for locomotive acceleration is avoided, and experiment space is saved.

The invention discloses a motor non-speed sensor control method for smoothly switching composite rotating speed identification. In the method, the model reference fuzzy self-adaptive rotating speed identification of the magnetizing current reactive power is adopted for identifying the rotating speed of the motor in high speed; the slip angular speed ring opening rotating speed identification is adopted for identifying the rotating speed of the motor in low speed; the method for smoothly switching factors is adopted for smoothly transiting the two motor rotating speed identification methods, thus realizing the composite identification of the high and low rotating speed of the motor in the starting process of the motor. The invention has the beneficial effects that the method solves the contradiction that the indexes of the dynamic property and the steady-state performance in the traditional single rotating speed identification speed can not be simultaneously optimized so that the motor has the good rapidity and strong dynamic track during the starting; in the steady-state process, the overshoot is small and the speed control precision is high; the method has the complete robustness for the state resistance, can implement the vector control of the non-speed sensor in a wider speed range, thus realizing the composite identification of the high and low rotating speed of the motor in the true sense.

The invention discloses a charging and discharging control system and a charging and discharging control method of a flywheel battery. The system comprises a three-phase uncontrollable rectifying circuit, an energy storage filter capacitor, an insulated gate bipolar translator (IGBT) power conversion circuit, a zero passage detection circuit, a voltage detection circuit, a current detection circuit, a direct current voltage detection and overvoltage protection circuit, a sampling and filtering overcurrent protection circuit, a displacement sampling circuit, a temperature sampling circuit, a digital signal processor controller, an energy storage inductor, a three-phase linked switch and a rotary transformer signal processing circuit, wherein the energy storage inductor is connected between the output end of each phase on the alternating current side of the IGBT power conversion circuit and the input end of a flywheel motor; the three-phase linked switch is connected in parallel with the energy storage inductor respectively; and the rotary transformer signal processing circuit is connected between the signal output end of a rotary transformer of the flywheel motor and the quadrature encoder pulse (QEP) port of the DSP controller. In the method, charging and discharging control of a flywheel battery is realized based on the system. The system has stable output direct current voltage, small high-frequency ripple, quick dynamic response, and is particularly suitable for quick charging and quick discharging working conditions; and the power factor and efficiency of the system are improved greatly.

The invention discloses a testing system and a testing method for the propeller ground test in the near space. The system comprises an incoming flow simulation system, a propeller rotating speed control system, a data measurement system and a support. The data measurement system comprises a two-component balance and a data acquisition and control module. The forward velocity and the rotating speed of a propeller are respectively and precisely controlled by a trailer and a motor. The propeller rotating speed control system comprises a motor, wherein the motor is fixed inside the two-component balance. The end portion of the output shaft of the motor extends out of the two-component balance. The propeller is fixed at the end portion of the output shaft of the motor and is driven by the motor to rotate. The support is of a cantilever beam structure, and the rear end of the cantilever beam structure is fixed at the front end of the head part of the trailer and is extending forwardly. The two-component balance is fixed at the front end of the support. According to the technical scheme of the invention, the test state is simulated by utilizing a track trailer. The forward velocity of the trailer is relatively low and the velocity control precision of the trailer is relatively high. Therefore, a stable incoming-flow environment is provided for the propeller.

The invention provides a double-direct current brushless motor controller of a currency counting machine. The double-direct current brushless motor controller comprises a power supply circuit, a rotor position detection circuit and a communication unit. The rotor position detection circuit comprises a microprocessor control circuit of master and slave microprocessors, a master control power tube driving circuit and a slave control power tube driving circuit, wherein the master control power tube driving circuit and the slave control power tube driving circuit are used for driving two direct current brushless motors. The controller is used for receiving instructions from the currency counting machine to control a master direct current brushless motor and a slave direct current brushless motor to work. The communication unit is used for communicating a state signal and a speed signal between the master and slave microprocessors so as to allow the master direct current brushless motor and the slave direct current brushless motor to cooperatively work, is used for controlling the master and slave motors of the currency counting machine to output stable speed under different loads and guarantees currency to stably and sequentially pass through detection positions of optical and electromagnetic sensors.

The invention belongs to the technical field of motor control, and relates to a speed sensorless control method of a permanent magnet synchronous linear motor. Based on a slip die control principle and a model reference self-adaptive theory, an SMC-MRAS speed observing model is designed; by using a synchronous linear motor itself as a reference model and a motor current model as an adjustable model, a slip die model is structured according to the differential value of output parameters of two models; a Sigmoid function is selected as a switch function; the buffeting of the system is effectively reduced, the speed control precision of the permanent magnet synchronous linear motor is improved; the speed sensorless control method has strong robustness and reliable dynamic and static performances.

The invention discloses an environment-friendly modular dredger. The dredger comprises a buoyant box module, a positioning pile system module, a bridge system module, a digging device module, a portal module, a supporting platform module, a power system module, a propelling system module, a living and control system module and a manipulation module. The environment-friendly modular dredger is convenient to transport by land and assemble and disassemble with the adoption of the standard functional modules and can operate after being transported to a designated lake and reservoir areas and assembled, and the standard modules can be used for series of vessels as required.

The invention discloses a speed adjusting hydraulic cylinder. The hydraulic cylinder comprises a working cylinder barrel and a speed adjusting cylinder barrel which are connected into a whole through a middle cylinder head, wherein the end of the speed adjusting cylinder barrel is provided with a back cylinder head; the end of the working cylinder barrel is provided with a front cylinder head; a working cylinder piston is arranged in the working cylinder barrel; a speed adjusting cylinder piston is arranged in the speed adjusting cylinder barrel; a piston rod positioned in the working cylinder barrel and the speed adjusting cylinder barrel passes through the middle cylinder head; one end of the piston rod is connected with the speed adjusting cylinder piston, and the other end of the piston rod stretches out of the front cylinder head; the working cylinder piston is arranged on the piston rod; the working cylinder barrel is provided with an oil inlet and an oil return port; magnetorheological fluid is filled in the speed adjusting cylinder barrel; a damping pipe made from a magnetic conductive material is connected in parallel with the speed adjusting cylinder barrel; two ends of the damping pipe are connected with two side cavities of the speed adjusting cylinder piston; a damping hole is formed in the damping pipe; and an electromagnetic coil is arranged on the outer side of the damping hole. The hydraulic cylinder conveniently adjusts the speed and is high in speed control accuracy.

The invention discloses a permanent magnet synchronous motor starting control method based on a hypothetical reference frame strategy. The permanent magnet synchronous motor starting control method has the advantages that the internal temperature is not changed in consideration of the situation that a motor is just started, the motor back electromotive force constant is still a design value at themoment, and when non-load starting, the amplitude of the voltage vector is almost in direct proportion to the rotational speed of the motor; the point is used for adjusting the rotational speed estimated correction amplitude limiting value in the hypothetical reference frame strategy, so that the non-speed smooth starting of the permanent magnet synchronous motor can be realized in the algorithmcontrol adopting speed and current double closed loops without the switching process of two control algorithms; and in addition, the control over an exciting current can improve the speed control precision and improve the system performance in the starting process, so that it is ensured that no sudden change in a phase current and a rotor position is achieved in the starting process of the permanent magnet synchronous motor, and no jitter is achieved in the rotational speed.

The invention discloses a wire arrangement controlling method based on an actuating motor, which comprises the following steps: using the origin of an absolute value encoder built in an wire arrangement motor as a coordinate system origin and using the deflection angle of the motor with respect to the origin as an independent variable to construct a position coordinate system of the wire arrangement motor; determining the position movement range of a wire arrangement pulley according to the positions at two sides of the inner edge of a wire-winding disc spool and real-time feeding the speed and position information of the wire arrangement motor back to a motion controller, and calculating the command speed of the wire arrangement motor in the next sampling period via the motion controller according to the speed and position information fed back from the wire arrangement motor and the angular velocity fed back from a wire-winding motor. The invention replaces a proximity switch and a variable motor with the absolute value encoder and the actuating motor, so as to remarkably improve the control precision; the spacing position can be randomly set, so as to ensure reliable performance; and the speed tracking control adopts advanced shaftless transmission technology, so that the speed control precision is high, and the wire arrangement is uniform and flat.

In the invention, a relief valve is connected with a magnetic reserving valve, a shuttle valve, a proportional direction valve and an actuator. Another relief valve is in parallel on one side of the said relief valve. A pressure compensator is connected with a magnetic reserving valve, an oil inlet, and an oil return port. One end of the shuttle valve is connected with an oil outlet of the proportional directional valve and a working cavity of the actuator. The other end of the shuttle valve is connected with another oil outlet of the proportional directional valve and another working cavity of the actuator.

The invention provides a controller for permanent magnet synchronous motor and a motor control system. Two motor constants in the two zones such as a low-speed zone and a high-speed zone are defined. A motor control system includes: a permanent magnet synchronous motor; a power converter connected to the motor, a current detector configured to detect a current flowing through the permanent magnet synchronous motor, a controller generating a control signal for controlling the power converter; the controller comprising: a vector controller configured to generate the control signal on the basis of the detected current; an axial error estimating computing unit configured to estimate an axial error information which is a difference between a phase value of the motor and the phase estimation value obtained by integrating a rotational speed estimation value of the motor; a speed estimating computing unit, which is characterized in that: a motor constant identification computing unit configured to identify a motor constant of the permanent magnet synchronous motor with the q-axis voltage component and the rotational estimation value or a rotational speed command and reflects the identified motor constant in generating the control signal by the vector controller.

The invention provides a simplified phase-voltage reconstruction method of a three-level converter which is applicable to the converter using a three-level topological structure. The converter can supply power for a squirrel-cage motor speed governing system, a winding motor double-fed speed governing system and a synchronous motor speed governing system. The operating method of the three-level converter comprises the following steps: dividing a vector space output by the traditional three-level converter into six small hexagons, and then carrying out corresponding output phase-voltage reconstruction algorithms in the small hexagons; and finally achieving the purpose of three-level calculation by coordinate translation and compensation amount calculation. The algorithm is relatively simple, the obtained results can fully replace the results obtained by using an output sensor, and the results are more accurate than the results obtained by directly using a SVPWM command. The method simplifies system composition and improves reliability and stability of the system.

The invention belongs to the technical field of motor speed control and relates to a speed sensorless control method for a motor with high precision and speed requirements. The speed sensorless control method comprises the steps of constructing a speed observer model by using an MRAS (Model Reference Adaptive System) principle; in order to utilize an SMC (Sliding Mode Control)-MRAS rotation speedidentification method, selecting a PMSM (Permanent Magnet Synchronous Motor) as a reference model and a stator current model as an adjustable model, and constructing a sliding mode surface S by usingoutput differences of the two models to improve the speed observation precision; meanwhile, replacing the conventional Sgn function with a Sigmoid function as a switching function in sliding mode control to establish a sliding mode observer model so that the system has better dynamic and static stability; then proving that the rotation speed observation method in combination with the MRAS and theSMC has strong robustness and good dynamic and static performance in the PMSM speed sensorless direct torque control system by changing the reference speed value and the load torque through operationsimulation of a Matlab / Simulink.

A control method for speed measurement of an asynchronous motor and a device therefor adopt a controller for controlling a power inverter to output three-phase low-frequency symmetrical alternating current uu, uv and uw and apply a high-frequency exciting voltage uuH in the U-phase voltage; current transformers are respectively connected between the power inverter and V phase and between the power inverter and W phase of a stator winding of the asynchronous motor in series; the output ends of the two current transformers are respectively connected with a signal subtracter; the output end of the signal subtracter is sequentially connected with a signal filter and a system controller; the system controller is also connected with a speed setting signal device and a motor speed display; and the system controller controls the power inverter in real time according to the speed setting signal device through receiving the signal filtered by the signal filter and realizes the control of the speed of the asynchronous motor to be tested. Compared with the prior art, the invention does not need a speed sensor and has simple test method, high system reliability, quick response, good characteristic of low-speed dynamic response, high speed control accuracy and good application prospect.

The invention relates to a control method of an electronic control silicone oil fan clutch. The method mainly includes the following steps of firstly, calculating the expected value of the rotating speed of a fan under the current working conditions of an engine according to an influence factor of the temperature of the engine; secondly, calculating the PWM duty cycle Duty_Cyc of the control overthe rotating speed of the fan in the current cycle; thirdly, sending the PWM cycle calibrated in advance and the PWM duty cycle Duty_Cyc of the control over the rotating speed of the fan in the current cycle to a PWM controller through an ECM, and adjusting the amount of silicone oil in a working cavity of the electronic control silicone oil fan clutch through the PWM controller to realize one time of adjustment of the rotating speed of the fan; and fourthly, executing the first step, the second step and the third step again to obtain the PWM duty cycle Duty_Cyc of the control over the rotating speed of the fan in each cycle, thereby realizing multi-stage adjustment of the rotating speed of the fan. By means of the method, the precision of the control over the rotating speed of the fan ishigh, noise is low, energy consumption is reduced, more oil is saved by the engine, and the fuel oil economical performance is greatly improved.

The invention discloses a servo driver which comprises a rectifier, an auxiliary power supply, an IPM inverter, a signal collection unit and a dual-core processor. The rectifier, the IPM inverter, the signal collection unit and the dual-core processor are sequentially connected. The output end of the rectifier is connected with the input end of the dual-core processor through the auxiliary power supply. The output end of the dual-core processor is connected with the control end of the IMP inverter. The servo driver further comprises a filter which is connected between the rectifier and the IMP inverter. The servo driver has the advantages of being simple in system, low in cost, short in development cycle, user-friendly in operation, simple in parameter adjustment, high in speed control accuracy, quick in speed dynamic response and high in power supply application rate. Dual cores, namely, the DSP and the ARM, are contained in the dual-core processor, and therefore the communication problem between a traditional dual-core scheme of the DSP and the CPLD or a traditional dual-core scheme of the DSP and the RAM is solved, the data communication speed and the data communication efficiency are greatly improved, and complexity of the servo system is greatly reduced.

The invention provides a motor speed control circuit which improves the speed control precision of the motor. A motor speed control circuit that controls the rotational speed of the motor by controlling the amount of current flowing through the drive coil of the motor includes a reference voltage circuit to which a speed command signal for commanding the rotational speed of the motor is input, and based on the speed command a signal generating reference voltage; a speed voltage circuit that generates a speed voltage corresponding to the actual rotational speed of the motor; a clamp circuit that limits the level of the speed voltage generated in the speed voltage circuit; a comparison circuit that is applied to the reference voltage generated in the reference voltage circuit and the speed voltage whose level is limited in the clamp circuit, and compare the two; and a control signal generation circuit based on the comparison circuit As a result of the comparison, a control signal for controlling the amount of current flowing in the drive coil is generated and output.

The invention discloses an aircraft gliding deceleration control method. The method comprises steps that whether deceleration control is needed is determined according to a difference value of an instruction speed Vcx provided by a guidance system and a motion speed Vd of an aircraft relative to the Earth acquired by a navigation system; if yes, a required basic attack angle alpha0 is acquired through calculation; a dissipation speed deltaV is acquired through calculation; a required deceleration attack angle alphan is acquired through calculation; an additional guidance force Fzc<V> for deceleration control is acquired through calculation; deceleration control on the aircraft is carried out according to the additional guidance force for deceleration control acquired through calculation. Through the method, precise speed control on the aircraft can be realized.

The invention relates to a dynamic response characteristic test method for an air propeller electric propulsion system. The method comprises: a ground test system of an electric aircraft propeller is constructed; a trailer is accelerated to be at a steady-state speed at different accelerated speeds, the acceleration state is kept for a period of time, and a tensile force and a torque of the propeller and a rotating speed of the motor are measured; the speed of the trailer is kept to be constant, the rotating speed of a motor is adjusted, and a tensile force and a torque of the propeller are measured; and the influence on the rotating speed of the motor by a trailer speed change as well as influences on the tensile force and torque of the propeller by the trailer speed change or motor rotating speed change is analyzed. The test method has the following advantages: the trailer speed can be controlled precisely; the trailer system has the large accelerated speed; the marching speed of the propeller can be changed; and the dynamic response characteristic of the propulsion system can be simulated when gust happens. The speed regulation characteristic of the electric propulsion system of the propeller can be measured by changing the rotating speed instruction of the motor. The test method is suitable for a dynamic response characteristic test of a propulsion system of a low-speed electric propeller aircraft.

Provided are an electrical control system and a synchronizing device for a three-strand tire cord straight twisting machine. The electrical control system comprises a programmable logic controller (PLC), the PLC is electrically connected with a plurality of spindle position units, single-chip microcomputer controllers are arranged in the spindle position units and electrically connected with the PLC, the PLC is electrically connected with a spindle frequency converter, the spindle frequency converter is simultaneously electrically connected with a first permanent magnet synchronous motor of a first spindle and a second permanent magnet synchronous motor of a second spindle, the first permanent magnet synchronous motor and the second permanent magnet synchronous motor are simultaneously driven by the spindle frequency converter to synchronously rotate, the speed is set by the PLC, and a starting and shutdown mode is controlled by adopting I / O contacts. The two permanent magnet synchronous motors are driven by adopting the spindle frequency converter, the twisting speeds at the two spindle positions are always consistent, the twist degree of the left spindle position and the twist degree of the right spindle position are identical, the electrical control system is high in efficiency, saves energy and is green and environmentally friendly, an open-loop control mode is adopted, and system stability is improved.

The invention provides a miniaturized area array Gm-APD laser radar device with single photon detection sensitivity, and belongs to the technical field of laser. The laser radar device comprises a ball nacelle, a two-axis servo frame, a gyroscope, a motor, a grating coded disc, a control processor, an information processor, a short-wave infrared laser, a Gm-APD detector, a receiving optical system, an optical fiber coupler, a transmitting optical system, a secondary power supply and an upper computer. The two-axis servo frame, the gyroscope, the motor, the grating coded disc, the control processor, the information processor, the short-wave infrared laser, the Gm-APD detector, the receiving optical system, the optical fiber coupler, the transmitting optical system and the secondary power supply are arranged in the spherical pod. The laser radar device has the performances of high-precision tracking and pointing, image stabilization and the like.

The invention belongs to automobile parts, and particularly relates to a middle cover structure for oil-gas separation of a hydraulic retarder. The front side face of a middle cover serves as a side face connected with a front cover, the rear side face of the middle cover serves as a side face connected with a rear cover, a working cavity is formed in the middle of the side face connected with the front cover, exhaust holes are formed in the step face of the working cavity, and a working cavity oil-gas separation chamber is arranged at the lower end of the working cavity and communicated with the working cavity through the exhaust holes; silencer mounting holes in the side face, connected with the front cover, of the back face of an exhaust cavity are communicated with a first pressure stabilizing chamber and a second pressure stabilizing chamber, an oil tank oil-gas separation area is arranged on the side face, connected with the rear cover, of the left side of the exhaust cavity, and the part, except the oil tank oil-gas separation area and the exhaust cavity, of the inner side of the joint between the middle cover and the rear cover serves as an oil tank; and a plurality of criss-cross reinforcing ribs II are arranged in the oil tank. The middle cover structure is simple in structure and high in integration level, can achieve oil-gas separation in the working cavity and the oil tank of the hydraulic retarder, and reduces the loss of working oil.

The invention discloses a charging and discharging control system and a charging and discharging control method of a flywheel battery. The system comprises a three-phase uncontrollable rectifying circuit, an energy storage filter capacitor, an insulated gate bipolar translator (IGBT) power conversion circuit, a zero passage detection circuit, a voltage detection circuit, a current detection circuit, a direct current voltage detection and overvoltage protection circuit, a sampling and filtering overcurrent protection circuit, a displacement sampling circuit, a temperature sampling circuit, a digital signal processor controller, an energy storage inductor, a three-phase linked switch and a rotary transformer signal processing circuit, wherein the energy storage inductor is connected between the output end of each phase on the alternating current side of the IGBT power conversion circuit and the input end of a flywheel motor; the three-phase linked switch is connected in parallel with the energy storage inductor respectively; and the rotary transformer signal processing circuit is connected between the signal output end of a rotary transformer of the flywheel motor and the quadrature encoder pulse (QEP) port of the DSP controller. In the method, charging and discharging control of a flywheel battery is realized based on the system. The system has stable output direct current voltage, small high-frequency ripple, quick dynamic response, and is particularly suitable for quick charging and quick discharging working conditions; and the power factor and efficiency of the system are improved greatly.

The invention discloses a GNSS (Global Navigation Satellite System) resolving method based on block particle filter, and relates to a GNSS resolving method of block particle filter. The invention provides a GNSS resolving method based on block particle filter for solving the problems of complicated calculation amount of a traditional linearizing method, higher dimension of an iteration vector in an iteration process, and restriction on precisions of location and constant speed resolving. The GNSS resolving method comprises the following steps: 1, setting parameters described in the specification at a moment 0; 2, calculating parameters X<(m)>k and Y<(m)>k; 3, solving a normalization weight described in the specification; 4, if Meff is more than Mth, skipping to a step 5, and if Meff is less than Mth, re-sampling; 5, solving a location estimation result described in the specification; 6, determining parameters described in the specifications; 7, solving a normalization weight described in the specification; 8, if a parameter described in the specification is more than a parameter described in the specification, skipping to a step 9, and if the parameter described in the specification is less than the parameter described in the specification, re-sampling; 9, performing constant-speed resolving of an estimation result described in the specification at a moment k, and 10, k is equal to k+1, skipping to the step 2, and repeating processes from the step 2 to the step 10. The GNSS resolving method is applied to the field of a GNSS of block particle filter.

According to the rail transit vehicle and the wheel set system and the control method thereof, suspension bearing, electromagnetic guiding, electromagnetic traction and braking are achieved through electromagnetic induction, a traditional wheel set gear box and a traction motor mechanism can be completely omitted, the unsprung mass control difficulty can be overcome, the unsprung mass of the vehicle is greatly reduced, the wheel rail force is reduced, and the service life of the vehicle is prolonged. Track maintenance cost can be effectively reduced, and the service life of the track is prolonged.

The present invention provides a metal sheet double-sided printing inspection line. The metal sheet double-sided printing inspection line comprises a first surface detecting conveying part in connection with a feeding part, a first image detecting device arranged at a position above the first surface detecting conveying part, a second surface detecting conveying part in connection with an outlet of the first surface detecting conveying part, and a second image detection device arranged at a position below the second surface detecting conveying part. The second surface detecting conveying partincludes a magnetic adsorbing device for adsorbing a metal sheet. Defects on the upper surface of the metal sheet can be detected by the first image detecting device arranged at the position above thefirst surface detecting conveying part, defects on the lower surface of the metal sheet can be detected by the second image detecting device arranged at the position below the second surface detecting conveying part, and the magnetic adsorbing device adsorbing the metal sheet completes the adsorption of the metal sheet on the second surface detecting conveying part.

A motor speed control circuit which controls a rotational speed of a motor by controlling an amount of current flowing through a drive coil of the motor. The control circuit comprises a reference voltage circuit that generates a reference voltage corresponding to a speed-specifying signal inputted to specify the rotational speed of the motor; a speed voltage circuit that generates a speed voltage corresponding to an actual rotational speed of the motor; a clamp circuit that limits the level of the speed voltage generated by the speed voltage circuit; a comparator that has the reference voltage generated by the reference voltage circuit and the speed voltage limited in level by the clamp circuit applied thereto and compares the two; and a control signal generator that generates and outputs a control signal for controlling the amount of current flowing through the drive coil based on the comparing result of the comparator.

The invention relates to a control method of an electronic control silicone oil fan clutch. The method mainly includes the following steps of firstly, calculating the expected value of the rotating speed of a fan under the current working conditions of an engine according to an influence factor of the temperature of the engine; secondly, calculating the PWM duty cycle Duty_Cyc of the control overthe rotating speed of the fan in the current cycle; thirdly, sending the PWM cycle calibrated in advance and the PWM duty cycle Duty_Cyc of the control over the rotating speed of the fan in the current cycle to a PWM controller through an ECM, and adjusting the amount of silicone oil in a working cavity of the electronic control silicone oil fan clutch through the PWM controller to realize one time of adjustment of the rotating speed of the fan; and fourthly, executing the first step, the second step and the third step again to obtain the PWM duty cycle Duty_Cyc of the control over the rotating speed of the fan in each cycle, thereby realizing multi-stage adjustment of the rotating speed of the fan. By means of the method, the precision of the control over the rotating speed of the fan ishigh, noise is low, energy consumption is reduced, more oil is saved by the engine, and the fuel oil economical performance is greatly improved.