185results about How to "Achieve balance control" patented technology

The invention discloses a duel-clutch stepless speed change series parallel hybrid power system in the technical field of automobiles, which comprises an engine, a first clutch, a first motor, a second clutch, a second motor, a speed reduction differential gear, a driving axle, a wheel, an energy storing device, a motor control device, an attachment drive transmission gear and a starting motor, wherein a crank shaft output end of the engine is connected with a rotor of the first motor through the first clutch; the rotor of the first motor is also connected with a rotor of the second motor through the second clutch; the rotor of the second motor is connected with the wheel through the speed reduction differential gear and the driving axle; the energy storing device is electrically connected with the motor control device; the attachment drive transmission gear is connected to the rotor of the first motor to provide hybrid drive for attachments for air-conditioning, braking, steering and the like; and the starting motor is connected with the crank shaft output end of the engine through an input end driving disc of the first clutch. The duel-clutch stepless speed change series parallel hybrid power system has the characteristics of entire car stepless speed change series parallel drive, attachment system hybrid drive, low system cost, low development cost, low maintenance cost and the like.

A remote control system for lifting netted case is composed of floating netted casing for culturing purpose, the main flating tube with water valve and air valve, air pump, and lifting control unit consisting of casing, solar cell board, electric accumulator, motor, air pump, electric valve and program control box. Its control method features that the floating or sinking command is transmitted from mobile telephone to mobile communication module of said system for executing lifting or sinking operation.

The invention discloses a mechanical double-overrunning clutch adaptive automatic transmission external motor drive axle. The drive axle comprises an axle shell, a drive motor is externally arranged,a transmission system is located in the axle shell and comprises a low gear transmission mechanism, a reverse gear transmission mechanism and an adaptive transmission assembly; the reverse gear mechanism has a transmission ratio I which transmits a reverse gear power from an auxiliary shaft to a main shaft, the low gear transmission mechanism has a transmission ration II which transmits a low gearpower from the auxiliary shaft to the main shaft, and the transmission ratio I is greater than or equal to the transmission ratio II. According to the mechanical double-overrunning clutch adaptive automatic transmission external motor drive axle, reasonable cooperation of two overrunning clutches is utilized, so that the overall structure is simple and compact, a transmission line is shared by reverse gear transmission, low gear transmission and fast gear transmission, and no interference is produced, the overall performance is ensured, the adaptive capacity is relatively strong, the cooperation with the adaptive automatic transmission mechanism is smooth and natural, the overall efficiency is improved, the whole transmission system is located in the axle shell, the overall structure is compact, the strength and rigidity of the whole axle is improved, and the occupying volume is small.

The invention discloses a carrier implementation method for low common-mode voltage modulation of a three-phase five-level inverter. The carrier implementation method comprises the steps of sampling a three-phase original modulation wave, and calculating a minimum zero-sequence component; determining the carrier phase according to the three-phase original modulation wave and the minimum zero-sequence component; superposing the minimum zero-sequence component on the three-phase original modulation wave so as to acquire a three-phase intermediate modulation wave; determining an upper boundary and a lower boundary of a located carrier according to the position of the three-phase intermediate modulation wave; calculating the distance between the three-phase intermediate modulation wave and the upper boundary and the distance between the three-phase intermediate modulation wave and the lower boundary, and solving the minimum distance between the upper boundary and the lower boundary; solving a zero-sequence component by using the acquired minimum distance; superposing the zero-sequence component on the three-phase intermediate modulation wave so as to acquire a corrected three-phase modulation wave; and finally comparing the corrected three-phase modulation wave with a three-phase carrier, and generating a PWM wave control five-level inverter. The carrier implementation method disclosed by the invention can realize the advantages of low common-mode voltage, small flying capacitive voltage fluctuation, low harmonic distortion and the like. Because of adoption of carrier implementation, the method is simple to implement, convenient to control and easy to be popularized to actual engineering.

The invention discloses a double-overrunning-clutch shaft sleeve output taper sleeve type self-adaptive automatic gear shifting spindle assembly. The double-overrunning-clutch shaft sleeve output taper sleeve type self-adaptive automatic gear shifting spindle assembly comprises a spindle, a gear shifting system and a power output shaft sleeve, wherein the gear shifting system and the power outputshaft sleeve are arranged on the spindle. The gear shifting system comprises a low speed gear power input member, a reverse gear power input member and a self-adaptive gear shifting assembly; the reverse gear power input member has a transmission ratio I, the low speed gear power input member has a transmission ratio II, and the transmission ratio I is greater than or equal to the transmission ratio II; the double-overrunning-clutch shaft sleeve output taper sleeve type self-adaptive automatic gear shifting spindle assembly utilizes reasonable matching of two overrunning clutches, a reverse gear structure and a low speed gear mechanism reasonably set the transmission ratios, so that the overall structure is simple and compact, no interference occurs, the overall performance is ensured, thestability of the transmission is ensured, the shaft sleeve is used for outputting power, the output parts can be selected according to needs, and the double-overrunning-clutch shaft sleeve output taper sleeve type self-adaptive automatic gear shifting spindle assembly is not only suitable for the field of electric vehicles, but also suitable for other fields of variable torque mechanical transmission; and meanwhile, the shaft sleeve output can further ensure larger output torque.

The invention provides an accuracy control method for single-phase diode clamping three level midpoint potential imbalance, which specially aims at the accuracy control of the midpoint potential imbalance by analyzing the influence of the zero level to the direct current-side midpoint potential, and changing the distribution of the zero level among different bridge arms due to the symmetry and the redundancy under the condition that the outlet voltage wave form is not changed and the direct current component is not led, wherein the control method is only relevant to the modulating wave of each module, and is suitable for a large-scale cascade diode clamping topological structure. According to the method, the modulating wave of each module is divided into two parts, the two modulating waves are equal in size and reversed in directions and respectively control the left half bridge and the right half bridge of the diode clamping, and the required direct current component is injected into the modulating wave as required, so that the accuracy control of the midpoint potential can be formed, and additional auxiliary devices are not needed, therefore, the method is simple and easy. The simulation and experiment results show the exactness and the reliability of the method, so that a good reference value can be provided for the engineering application.

The invention discloses a planetary system output mechanical double-overrunning-clutch self-adaptive automatic speed change spindle assembly. A planetary gear system is adopted for outputting power. Aspeed change system comprises a low-speed gear transmission mechanism, a reverse gear transmission mechanism and a self-adaptive speed change assembly. The reverse gear mechanism has a transmission ratio I for transmitting reverse gear power from an auxiliary shaft to a spindle, the low-speed gear transmission mechanism has a transmission ratio II for transmitting low-speed gear power from the auxiliary shaft to the spindle, and the transmission ratio I is larger than or equal to the transmission ratio II. Two overrunning clutches reasonably cooperate, the overall structure is simple and compact, reverse gear transmission, low-speed gear transmission and high-speed gear transmission share a transmission route and do not interfere in one another, the overall performance is guaranteed, highadaptability is achieved, cooperation with a self-adaptive automatic speed change mechanism is smooth and natural, planetary deceleration output is adopted, the output torque can be improved, a high-speed motor can be adopted as a power source, the overall efficiency is improved, and the spindle assembly is suitable for the field of electric vehicles and other torque-variable mechanical transmission fields.

The invention discloses a low-frequency operation integrated control system and method of modularization multi-level converters. The system comprises M phase modularization multi-level converters. Each phase modularization multi-level converter is connected with an integrated control device thereof. The integrated control devices are connected with a PWM signal generator. The integrated control devices comprise low-pass filtering units, average value computing units C, upper bridge arm controllers, head controllers and lower bridge arm controllers. The modularization multi-level converters are connected with the low-pass filtering units respectively. The low-pass filtering units are connected with the upper bridge arm controllers, the lower bridge arm controllers and the average value computing units C respectively. The average value computing units C carry out output to the upper bridge arm controllers, the lower bridge arm controllers and the head controllers which are connected with the upper bridge arm controllers, the lower bridge arm controllers and the PWM signal generators. Sub-module capacitor voltage balance, low-frequency ripple wave restraining, ring current constrained control and bridge arm current control are achieved.

The invention discloses a pressure control system for a steel enterprise pipe network based on dynamic matrix control, belonging to the technical field of steel enterprise steam pipe network pressure control. The pressure control system comprises system hardware and an application module, wherein the system hardware comprises a relationship database server, a real-time database server, an application server, and an engineer station, wherein the relationship database server is connected with the engineer station and the application server; the application server is connected with the relationship database server, and is further connected with the real-time database and the engineer station to keep the data exchange among the three; the application module comprises a relationship database, a data acquiring module, a data result display module, a pipe network computing module, a pipe network scheduling module and a pipe network control module, wherein the data result display module is arranged at the engineer station; the computing module, the scheduling module and the control module are arranged at the application server; the relationship database part is arranged at the relationship database server; and the data acquiring module is arranged at the real-time database; the pressure control system has the advantages of achieving quick control for the pipe network, and ensuring the safe operation of the pipe network.

The invention discloses a mechanical type dual-overrun clutch self-adaptive automatic transmission axle with a planetary system for output. The mechanical type dual-overrun clutch self-adaptive automatic transmission axle with the planetary system for output comprises a drive axle shell body and a planetary gear train, wherein a speed control system is located in the drive axle shell body, and thespeed control system comprises low-speed gear drive mechanism, a reverse gear drive mechanism and a self-adaptive transmission assembly; and the reverse gear drive mechanism has a drive ratio I transmitting reverse gear power from a countershaft to a hollow main shaft, the low-speed gear drive mechanism has a drive ratio II transmitting low-speed gear power from the countershaft to the hollow main shaft, and the drive ratio I is larger than or equal to the drive ratio II. According to the mechanical type dual-overrun clutch self-adaptive automatic transmission axle with the planetary system for output, the overall structure is simple and compact, the reverse gear drive, the low-speed gear drive and the high-speed gear drive use a drive route in common, the adaptive capacity is high, the cooperation is smooth and natural, and the overall efficiency is improved; the whole speed control system is located in the drive axle shell body, the overall structure is compact, and the strength andthe stiffness of the overall axle are improved; and the occupied area is small, planetary deceleration output is adopted, the output torque can be improved, and a high-speed motor can be adopted as apower source.

The invention discloses a self-adaptive automatic transmission for dual-overrunning-clutch shaft sleeve output. The self-adaptive automatic transmission comprises a speed control system, and a power output shaft sleeve which is rotatably matched with a main shaft in a sleeving mode, wherein the speed control system comprises a low-speed-gear transmission mechanism, a gear reversing transmission mechanism and a self-adaptive transmission assembly; and the gear reversing transmission mechanism is provided with a transmission ratio I for transmitting gear reversing power to the main shaft from asecondary shaft, and the low-speed-gear transmission mechanism is provided with a transmission ratio II for transmitting low-speed-gear power to the main shaft from the secondary shaft, and the transmission ratio I is greater than the transmission ratio II. Two overrunning clutches are reasonably matched, and the transmission ratios are reasonably set for the gear reversing mechanism and the low-speed-gear mechanism, so that the integral structure is simple and compact, interference is avoided, integral performance of the self-adaptive automatic transmission is guaranteed, and transmission stability is guaranteed; power is output by the shaft sleeve, and an output part can be selected according to the needs, so that the self-adaptive automatic transmission is suitable for the field of electric vehicles, and is also suitable for other variable-torque mechanical transmission fields. Meanwhile, the shaft sleeve output further can guarantee a relatively great output torque.

The invention discloses a method, a system and a device for a synchronous altering message; the method comprises the following steps: a network agent allocates alerting serial number containing ordinal relation for alerting content generated by a network element; the network agent reports the allocated serial number and alerting content to a network administrator and stores the serial number and alerting content and forms an alert log for each alerting content; the network administrator launches alerting synchronous request according to continuity of received serial number; finally the network agent carries out altering message synchronization according to requests of the network administrator. With the method, device and system of the invention adopted, balanced control of flow rate can be realized in the process of altering message synchronization.

The invention discloses a double-overrunning clutch mechanical type shaft end output self-adaptive automatic transmission electric drive system. The double-overrunning clutch mechanical type shaft endoutput self-adaptive automatic transmission electric drive system comprises a transmission system, a shaft sleeve and a third shaft, the transmission system comprises a low-speed gear transmission mechanism, a reverse gear transmission mechanism and a self-adaptive transmission assembly; and the reverse mechanism is provided with a transmission ratio I transmitting reverse gear power to a main shaft from an auxiliary shaft, the low-speed gear transmission mechanism is provided with a transmission ratio II transmitting low-speed gear power to the main shaft from the auxiliary shaft, the transmission ratio I is greater than or equal to the transmission ratio II, and the power is output through the power output shaft. According to the double-overrunning clutch mechanical type shaft end output self-adaptive automatic transmission electric drive system, reasonable matching of two overrunning clutches is used, the transmission ratios are arranged reasonably, so that the whole structure is simple and compact, reverse gear transmission, low-speed gear and rapid-gear transmission share a transmission route, interference does not occur, the integral performance is guaranteed, the shaft sleeve is output by the power and the third shaft, the double-overrunning clutch mechanical type shaft end output self-adaptive automatic transmission electric drive system is applied to electric vehiclefield, and applied to other variable torque mechanical transmission fields; and meanwhile, it is guaranteed that a larger output torque is further ensured through shaft sleeve output.

The invention discloses a low-modulation-index control method for a modular multi-level current converter. A modulation index is divided into two intervals of a high modulation index and a low modulation index; and in different intervals, carrier waves are different in amplitude, angular frequency and overlapping ratio. According to reference voltages of an upper bridge arm and a lower bridge arm, the modulation index interval in which the reference voltages are located is judged to obtain the amplitude, angular frequency and overlapping ratio of the carrier waves, the number of sub-modules required by the upper bridge arm and the lower bridge arm is further obtained, and then the balance control of capacitor voltages is realized according to a capacitor voltage balance control method. The sub-modules of the bridge arms do not need to be sorted and only a maximum value or a minimum value of the capacitor voltage of the sub-module put into operation or the sub-module not put into operation needs to be obtained, so that the calculation amount is reduced. According to the method, a linear voltage harmonic characteristic is superior to carrier wave in-phase stacking modulation under the low modulation index and is the same as the carrier wave in-phase stacking modulation under the high modulation index, an optimal harmonic characteristic of a linear voltage of the modular multi-level current converter in the whole modulation interval is realized, and the system performance is improved.

The invention discloses a mechanical double-override clutch-adaptive automatic-transmission electric drive axle based on planetary system output. The mechanical double-override clutch-adaptive automatic-transmission electric drive axle comprises a drive axle shell and a planetary gear train. A driving motor and a transmission system are located in the axle shell. The transmission system comprisesa low-speed transmission mechanism, a reverse gear transmission mechanism and a self-adaptive transmission component. The reverse gear transmission mechanism has a transmission ratio I for transmitting the reverse gear power from an auxiliary shaft to a hollow main shaft, the low-speed transmission mechanism has a transmission ratio II for transmitting the low-speed gear power from the auxiliary shaft to the hollow main shaft, and the transmission ratio II is greater than the transmission ratio I. The mechanical double-override clutch-adaptive automatic-transmission electric drive axle has theadvantages that the integral structure is simple and compact, the reverse gear transmission and the low-speed and high-speed gear transmission share a transmission line, the adaptive capacity is high, smooth and natural coordination is realized, and the overall efficiency is improved; the whole transmission system and the driving motor are arranged in the axle shell, the overall structure is compact, the strength and stiffness of the overall axle are improved, and the occupied space is small; planetary deceleration output is adopted, and accordingly, the output torque can be increased; the high-speed motor can be used as a power source.

The present invention discloses a non-isolated modularization three-level parallel inverter and a control method thereof and a control system thereof so as to achieve inhibition of a common mode resonance current, a ring current and a leak current. According to the non-isolated modularization three-level parallel inverter, a main control is arranged to I-shaped three-level inverter modularizationparallel, a filter is an improved LCL filter which changes a common mode loop structure to achieve inhibition of the high-frequency ring current and the leakage current. In order to inhibit the commonmode resonance caused by the improved LCL filter, the common mode loop is provided with an active controller to achieve inhibition of the common mode resonance current. The non-isolated modularization three-level parallel inverter further achieve the low-frequency ring current inhibition, the balance control of a neutral-point voltage at a direct current side and current tracking and the resonance inhibition of a difference module loop.

The invention discloses a neutral-point voltage balance control method of a three-level converter. The neutral-point voltage balance control comprises the following steps: converting three-phase voltage vector to a two-phase static coordinate system, and carrying out per-unit transformation on two-phase voltage vector according to a direct-current voltage value; step two, judging the serial number of a section where the voltage vector is according to the value of the two-phase voltage vector; step three, when the voltage vector is not in a first section, using coordination conversion to perform unified naturalization on the voltage vector to the first section; step four, obtaining four effective duty ratios according to a duty ratio calculation formula; and step five, distributing the numerical value of the four effective duty ratios to fix pairs of bridge arm switches of a three-phase bridge arm of the three-level converter, and converting the three-phase bridge arm duty ratio to a modulating wave comparison value to generate corresponding PWM driving pulse signals. According to the method disclosed by the invention, the average value of current flowing into a capacitance neutral-point in each switching period is guaranteed to be zero, so that the voltage increment on the capacitor in one switching period is zero, and the balance of neutral-point voltage is maintained.

The invention discloses a double overrunning clutch shaft sleeve output automatic speed changing electric drive system with input of a planetary gear train. The planetary speed reduction input is adopted. A speed changing system comprises a low gear transmission mechanism, a reverse gear transmission mechanism and a self-adaption speed changing assembly; the reverse gear transmission mechanism hasa transmission ratio I for transmitting reverse gear power from a counter shaft to a main shaft; the low gear transmission mechanism has a transmission ratio II for transmitting low gear power from the counter shaft to the main shaft; and the transmission ratio I is greater than or equal to the transmission ratio II. The double overrunning clutch shaft sleeve output automatic speed changing electric drive system with input of the planetary gear train makes use of reasonable cooperation of two overrunning clutches, so that the overall structure is simple and compact; the reverse gear transmission shares a transmission route with the low gear transmission and the fast gear transmission, and interference is avoided; and the overall performance of the system is guaranteed, the adaptive capacity is high, cooperation is smooth and natural, the manufacture cost is reduced, and the stability of transmission is guaranteed; and the planetary speed reduction input is adopted, a high speed motorcan be adopted as a power source, and the monolithic efficiency is improved. The double overrunning clutch shaft sleeve output automatic speed changing electric drive system not only is suitable for the field of electric cars, but also is suitable for other variable torque mechanical transmission fields.

The invention relates to an adjusting mechanism of a precise air-floatation operating platform. The adjusting mechanism of the precise air-floatation operating platform comprises a bearing cap (1), a base (2), a rotary disk (3), a stepped shaft (4) and the like, wherein the base (2) is arranged on a loading platform, the rotary disk (3) is arranged on the stepped shaft (3), and the bearing cap (1) is arranged on the base (2) through a screw nail. An H-type closed type air-floatation guide rail structure is applied to the precise air-floatation operating platform. The H-shaped closed type air-floatation guide rail comprises two Y-axis moving modules and an X-axis moving module. The symmetrical structure has a better dynamics performance and achieves high-precision location and moving of the operating platform.

The invention discloses a mechanical double-overrunning clutch self-adaptive automatic speed change bridge for planetary system input, which comprises a drive bridge shell and a planetary gear train for inputting power, wherein a speed change system is positioned in the bridge shell and comprises a low-speed gear transmission mechanism, a reverse gear transmission mechanism and a self-adaptive speed change assembly; the reverse gear mechanism has a transmission ratio I for transmitting reverse gear power from an auxiliary shaft to a hollow main shaft, and the low-speed gear mechanism has a transmission ratio II for transmitting low-speed gear power from the auxiliary shaft to the hollow main shaft, wherein the transmission ratio I is greater than or equal to the transmission ratio II; themechanical double-overrunning clutch self-adaptive automatic speed change bridge for planetary system input has the advantages that the integral structure is simple and compact, the reverse gear transmission, the low speed gear and the fast gear transmission share a transmission route, the adaptability is strong, the matching is smooth and natural, the integral efficiency is improved, the whole speed change system is positioned in the bridge shell, the integral structure is compact, the strength and the rigidity of the integral bridge are improved, the occupied volume is small, the planetary speed reduction input is adopted, the torque can be improved, and a high-speed motor can be adopted as a power source.

The invention discloses a dual-overrunning clutch self-adaptive automatic speed changing electric driving system output by a planetary system. A planetary gear train is adopted to output power, a speed changing system includes a low-speed gear transmission mechanism, a gear reversing transmission mechanism and a self-adaptive speed changing assembly, wherein the gear reversing mechanism has a transmission ratio I transferring gear reversing power from an auxiliary shaft to a main shaft, the low-speed gear transmission mechanism has a transmission ratio II transferring low-speed gear power fromthe auxiliary shaft to the main shaft, and the transmission ratio I is greater than or equal to the transmission ratio II. According to the dual-overrunning clutch self-adaptive automatic speed changing electric driving system output by the planetary system, reasonable cooperation of two overrunning clutches are used, thus the overall structure is simple and compact, gear reversing transmission and low-speed gear and quick-gear transmission share one transmission route without interference, whole performance is ensured, adaptive capacity is high, matching with a self-adaptive automatic speedchanging mechanism is smooth and natural, planetary deceleration output is adopted, output torque can be improved, a high-speed motor can be adopted as a power source, the overall efficiency is improved, and dual-overrunning clutch self-adaptive automatic speed changing electric driving system output by the planetary system is suitable for the field of electric vehicles, and is suitable for the field of other variable torque mechanical transmission.