86results about How to "Shorten the control cycle" patented technology

A main CPU determines whether or not there is a request for one valve driving based on an engine operating state such as an engine speed and a load factor, with reference to a control map. When it is determined that there is a request for one valve driving, it is determined whether or not there is an overlapping period between opening periods. When it is determined that there is no overlapping period, a high speed control is performed for controlling electromagnetically driven valves. When it is determined that there is no request for one valve driving, or when it is determined that there is the overlapping period, a low speed control is performed for controlling electromagnetically driven valves.

The invention provides an automatic driving automobile control system and method and microcontroller. The microcontroller comprises a main processor, a coprocessor and a CAN controller. The CAN controller is connected with the coprocessor and the main processor in a communication way to receive a CAN message and forward the CAN message to the coprocessor. The coprocessor interrupts receiving of the CAN message and the I/O input signal forwarded by the CAN controller and analyzes the CAN message and the I/O input signal so as to obtain corresponding control information and transmit the control information to the main processor. The main processor processes the control information so as to obtain a corresponding control output instruction to be transmitted to a second automobile controller used for controlling acousto-optic performance, starting and electrical parking of the automatic driving automobile or transmitted to a second automobile controller used for controlling driving of the automatic driving automobile. The communication load between the upper computer system and the microcontroller can be reduced and the communication efficiency between the upper computer system and the microcontroller can be enhanced.

The invention provides an integrated hub motor and a control method thereof. The integrated hub motor comprises a motor shaft and a stator fixed on the motor shaft, wherein the stator is externally sheathed with a rotor casing; the front end and the rear end of the rotor casing are rotatablely fixed on the motor shaft by a rotor end cover and a bearing; two ends of the motor shaft protrude outside the rotor end cover to form a long end and a short end; a bearing end cover is fixed at the outer side of the rotor end cover; and the short end of the motor shaft is covered therein. The invention is characterized in that a bearing end cover shaft is arranged in the middle part of the bearing end cover in a protruding mode towards the direction of the motor shaft, and a position detection device is arranged at the corresponding position of the end part of the motor shaft and the bearing end cover shaft; the motor shaft is sheathed with a servo controller; and the position detection device senses rotation of the bearing end cover shaft and transmits the sensed signal to the servo controller to finally obtain the rotating angle or position of the rotor after being processed by the servo controller, thus achieving accurate control of the motor. The invention has the advantages of simple structure, energy conservation, good starting characteristic, small volume and high efficiency.

The invention belongs to the field of control technology of brushless continuous current dynamo, and discloses a direct torque control method of a brushless continuous current dynamo. The method comprises the following steps: A. a preset torque is obtained according to the actual rotational speed and the command rotational speed of the dynamo; B. an estimating torque is obtained according to the rotor position and the three-phase current value of the input end of the dynamo; C. a first duty ratio is obtained according to the preset torque and the estimating torque, and is added with a second duty ratio related to the speed, and then a final duty ratio is obtained; D. the state of a switch tube is selected according to the final duty ratio, the rotor position and the plus-minus of the preset torque; E. an inverter is controlled to drive the dynamo to rotate according to the state of the switch tube. The invention also discloses a direct torque control device of the brushless continuous current dynamo. According to the invention, a linear counter emf form factor is adopted to calculate the torque, and control period is shortened; PWM (pulse width modulation) technology is combined, and a torque hysteresis regulator is improved, so that torque pulsation inhibition when the inductance of the dynamo is small is realized, and four-quadrant operation of the brushless continuous current dynamo is also realized.

The invention discloses a flexibility motion control IP (Intellectual Property) core and an implementation method thereof, belonging to the field of motion control. The IP core comprises a acceleration/deceleration module, an interpolation module, a pulse counting module, a pulse generation module, a bus controller and an RAM (Random Access Memory) interface module. The flexibility motion control IP core and the implementation method thereof aim to solve the problems that high speed and high precision cannot be achieved due to incapability of further reducing a control period since a motion control algorithm has a long running period in a general MCU (Micro Controller Unit) or DSP (Digital Signal Processor). The IP core has the characteristics of short control period and high output pulse precision, non-symmetrical linear acceleration and deceleration can be achieved, non-symmetrical S-shaped curve acceleration and deceleration can be achieved, two-axis or three-axis linear interpolation with the linear or the S-shaped curve acceleration and deceleration can be achieved, and two-axis arc interpolation at an uniform speed also can be achieved. Through the adoption of the IP core, motion control relevant algorithm is realized in a Verilog hardware description language soft core mode, the motion control relevant algorithm can be implemented in an FPGA (Field Programmable Gate Array), can be implemented in an ASIC (Application Specific Integrated Circuit) mode, and can be integrated into SoC (System On Chip), the typical working frequency is 100MHz, and feasibility is provided for building a flexibility motion control system.

The invention discloses an automatic control method of a thermal power generator plant. A parallel management strategy of automatic startup and shutdown of a thermal generator plant APS in the whole process and the whole range and a design scheme that a closed-loop is automatic at any time in the whole course are provided. The method comprises steps that when an MCS sub-loop should be invested and also is qualified for automatic investment, an APS system is automatically invested into the MCS sub-loop via an APS step order instruction; when the MCS sub-loop should be invested but is not qualified for the automatic investment, the APS system carries out APS setting opening or carries out forced opening by protecting overriding condition; and the APS carries out automatic setting on an enclosed loop set value in each of the MCS sub-loops according to states of the thermal generator plant. The objectives of the invention are to achieve parallel control of automatic startup and shutdown of the thermal generator plant APS in the whole process and the whole range; shorten control period; reduce effects on the control process imposed by change of working conditions; and provide technical precondition for obtaining of higher control quality of one-click start of the plant.

The invention discloses a large span steel tube arch bridge stents-free hoisting process, the large span steel tube arch bridge is the tied-arch bridge formed above the river and the bridge superstructure comprises arch ribs and a tie bar connected between two arch feet of the arch rib, a stiff skeleton is formed in the tie bar; the stents-free hoisting process for the large span steel tube arch bridge is as follows: 1, assembling the single arch rib with the stiff skeleton of the tie bar on the ground, on the assembling field at the bank side of one side of the river, assembling the arch steel tube stent of the arch rib with the stiff skeleton of the tie bar and obtaining the assembled single piece bridge superstructure; 2, integrally hoisting and positioning the single piece arch rib and the stiff skeleton of the tie bar; adopting floating crane shift platform for hoisting the assembled single piece bridge superstructure and transporting the structure to the bridge lower support structure. The large span steel tube arch bridge stents-free hoisting process is simple in technology process, reasonable in design, convenient in construction and good in construction effect; the large span steel tube arch bridge stents-free hoisting process can be finished simply and quickly, and the hoisting process is safe and reliable.

The invention discloses a novel photovoltaic power optimization control system. According to the photovoltaic power optimization control system, a layered and area-divided system structure is adopted, inverters and related equipment are divided into a plurality of areas, all the inverters in each area are connected with a corresponding second-stage controller through a corresponding second-stage switch, and the second-stage controllers are connected to a workstation and a first-stage controller through a first-stage switch; thus, the inverters of different areas can receive instructions simultaneously, the control cycle can be remarkably shortened, the control efficiency is increased, and the advantages are obvious when the photovoltaic power optimization control system is applied to photovoltaic power station projects with the capacity of 100MW or more; during the capacity-expansion upgrading of a photovoltaic power station, the capacity-expansion inverters can be divided into one or more areas, and the capacity-expansion upgrading can be realized by only increasing corresponding second-stage controllers without changing or even repealing the prior system structure and equipment. The photovoltaic power optimization control system has the advantages that the capacity-expansion upgrading of the photovoltaic power station can be carried out conveniently, the time/cost for the capacity-expansion upgrading can be effectively shortened/reduced, the progress of the projects is greatly increased, and the quality of the projects is greatly improved.

The invention discloses a construction process of a large-span steel tube arch bridge without supports. The constructed large-span steel tube arch bridge is a tied-arch bridge erected on a river channel. A bridge upper structure of the tied-arch bridge comprises arch ribs and tie bars connected between every two arch pins of the arch ribs. Rigid frameworks are arranged in the tie bars. The construction process includes the following steps of firstly, splicing the single-piece arch ribs and the rigid frameworks of the tie rods on the land, wherein arch-shaped steel tube supports of the arch ribs and the rigid frameworks are spliced on a splicing field on a bank side of the river channel; secondly, hoisting the single-piece arch ribs and the rigid frameworks of the tie rods together and placing the arch ribs and the rigid frameworks in place; thirdly, constructing the arch ribs through concrete, wherein the arch pins and end beams are constructed, and concrete is symmetrically pressed and poured for the arch ribs; fourthly, conducting pouring through a tie rod concrete suspended form method; fifthly, installing middle beams. The construction process is simple in process step, reasonable in design, convenient to construct and good in construction effect; the construction process of the large-span steel tube arch bridge without supports can be easily, conveniently and rapidly completed without greatly influencing the navigation of the river channel.

The invention discloses a control method for a nano satellite magnetic torquer space temperature compensation attitude. The control method specifically comprises the following steps that first, a system and an orbital coordinate system are built separately; second, in the despinning process, nano satellite attitude parameters and magnetic torquer parameters are obtained, and a despinning control law based on temperature compensation is built; third, in the capturing process, nano satellite attitude parameters and magnetic torquer parameters are obtained and subjected to optimizing treatment, and accordingly an attitude capturing control law based on temperature compensation is built; and fourth, a magnetic torquer is controlled by means of the despinning control law based on temperature compensation and the attitude capturing control law based on temperature compensation so as to control the satellite attitude. The control precision of the satellite attitude is improved by adopting a temperature compensation method, so that the control period is shortened, and validity is verified; and compared with a nano satellite system without temperature control, by using the method, good engineering application prospects are achieved, and wide ideas are supplied to low-cost microsatellite development.

The invention discloses a control system for rotary screen printing machines, which comprises a main controller, an electrical control module, a rotary-screen synchronous control module and a multi-path screen head control unit, wherein the main controller is the core of the whole control system, and used for coordinating the operations of the electrical control module, the rotary-screen synchronous control module and the screen head control unit, receiving and processing data sent from each module, and realizing the mutual cooperation and coordination of the modules, therefore, the main controller is the 'brain' and 'nerve center' of the control system of a whole printing machine. The control system disclosed by the invention adopts a dual-bus structure, therefore, the stability and response speed of system control of the rotary screen printing machine are improved. By using the control system disclosed by the invention, the problem of retaining the precise synchronization performance and efficient automatic registering performance of the ascending and descending speeds of the rotary screen printing machine in the processes of printing and dyeing can be solved, the accidents of fabric breaking, network disconnection, and 'pattern error' can be completely eradicated, and the production efficiency and product quality of equipment can be improved.

The invention discloses an automobile doubling auxiliary system based on a camera. The system comprises a sensor module, a single-chip microcomputer module, an intelligent vehicle steering engine module and a power supply management module. The invention also discloses a control method. Images in front of driving of the corresponding vehicle are acquired through videos, then road boundary information is sought by performing median filtering, dynamic threshold segmentation and other methods, and then speed and steering control is performed on the vehicle body by using the boundary information. Closed loop incremental PID control is performed on the speed so that the control period can be obviously shortened, acceleration and deceleration are enabled to be further timely and the speed is smoother. Closed loop PD control is performed on steering so that steering of the steering engine is enabled to be more sensitive and the effect of early prejudgment can be achieved. Therefore, the doubling auxiliary function can be realized, and the vehicle driving process is enabled to be safer and more reliable by the automobile doubling auxiliary system based on the camera and the control method thereof in comparison with the systems and the methods in the prior art.

The invention discloses a control method for a permanent magnet synchronous motor. The control method comprises the following steps: determining initial parameters of the permanent magnet synchronous motor; performing unified modeling on the motor and a converter thereof by using a hybrid switching theory; detecting the parameters of the permanent magnet synchronous motor again; performing on-line parameter identification on the motor by using a model reference adaptive parameter identification method; obtaining a PWM (Pulse-Width Modulation) signal for on/off of a converter power switch tube according to the solved optimal converter switching state combination; driving the converter to output corresponding voltage and current to complete the control over the motor. According to the control method disclosed by the invention, the control over the motor is completed by adopting the hybrid switching theory. The control method has the advantages of quick dynamic response and quick adjustment; besides, by using the model reference adaptive method, the identification of motor parameters is finished, high adaptive capability, high disturbance resistance and accuracy in control of the control method are guaranteed, and a permanent magnet synchronous motor system has more excellent dynamic and static performance and adaptive capability.

The invention belongs to the technical field of steam turbine control, and discloses a DEH control system under a steam turbine distributed control system (DCS). A DEH control method comprises the steps that the magnitude of a moment of force is changed by increasing/decreasing the gas inlet quantity or gas inlet parameters of a steam turbine, the changes of the moment of force and a moment of resistance are balanced and adapted to changes of external loads, and the rotation speed of a unit is maintained to be unchanged basically; and steam flow D of a formula of steam turbine steam torque iscontrolled, the steam turbine steam torque MT is changed, the steam turbine steam torque MT is enabled to change along with changes of generator electromagnetic torque MG, the rotation speed n is maintained to be in a range of power supply frequency set by a power grid, and the steam turbine is powered. According to the DEH control system under the steam turbine DCS, an operation control system ofthe unit is changed into an integrated management network combining security, economy and high-efficiency, long-term safe and stable operation of the unit are ensured, and the quality of electric energy and the economy of the operation after grid-connection are improved.

The invention relates to a snake-like robot joint, in particular to a modular snake-like robot joint. The problems that due to combination of a servo driving mode and a gear transmission mode, an existing snake-like joint is large in reverse backlash, long in control period, low in precision and poor in positioning capacity are solved. The modular snake-like robot joint comprises a joint input part, a joint output part, an intermediate shaft section, a motor assembly and a harmonic reducer, wherein the joint input part and the joint output part are arranged at the two ends of the intermediate shaft section correspondingly; the motor assembly and the harmonic reducer are arranged inside the intermediate shaft section side by side; the output end of the motor assembly is connected with the harmonic reducer and drives the harmonic reducer to rotate; and the harmonic reducer drives the joint output part to make swinging motion with the intermediate shaft section as an axis. Through arrangement of a torque sensor and a joint output end position sensor for measuring force-position information of the snake-like robot joint, the perceptive function of a robot is improved, and the robot can be controlled conveniently. The modular snake-like robot joint is applicable to snake-like robots.

The invention provides a welding device and a control method thereof and belongs to the field of welding technology. The welding device comprises a welding condition acquisition unit, a collection unit, an arc strike determination unit, an error calculation unit, an upper limit acquisition unit, and an on value calculation unit. The welding condition acquisition unit is used for acquiring predetermined welding conditions. The collection unit is used for collecting welding current. The arc strike determination unit is used for determining an arc strike phase according to the welding current. The error calculation unit is used for calculating errors of current state and sum of integral accumulative errors according to the welding current. The upper limit acquisition unit is used for acquiring a specific upper limit according to an upper limit of the predetermined integral accumulative error sum, correspondence between the welding conditions and the arc strike phase, the welding conditions, and the arc strike phase. The on value calculation unit is used for calculating an on value of a power device according to determination results of an error sum determination unit. The welding device and the control method thereof have the advantage that arc striking and welding can be well effective.

The invention discloses an automobile air suspension electronic control system, belonging to the technical field of automobile electronic control. The automobile air suspension electronic control system comprises a signal acquisition unit, an upper-layer control module, a bottom-layer control module and an execution mechanism, wherein mutual exchange and transfer of information flow and energy flow are implemented by a control circuit. The invention also discloses a control method of the system. The upper-layer control module can optimize the rigidity and damping of the suspension in real time according to the automobile working conditions and output the rigidity and damping to the bottom-layer control module as a reference input signal; and the bottom-layer control module calls a robust control program and generates a control instruction to adjust the execution mechanism of an air spring and a shock absorber according to the deviation between the reference rigidity and damping and the current rigidity and damping of the suspension. The system disclosed by the invention is designed by improving existing control system, the parts of original control system are continuously used as much as possible, thus the operation speed of the whole electronic control system is increased while the cost is increased slightly, and the automobile performance is perfectly improved.

The invention relates to a quick multivariable predication control method for an ethylene cracking furnace. The method has an offline link and an online link. In the offline link, a dynamic mathematic model and a static mathematic model of a production process of the ethylene cracking furnace are obtained through an analysis or recognition method and control parameters are set. In the online link, a prediction value is calculated and output according to a measurement value of an ethylene cracking furnace control system (DCS), a predication error is calculated based on the difference between the predication value and the measurement value and accordingly a static output predication value is corrected; and then a static control input predication value is calculated through static optimization or a direct inversion method; and finally a control input value of a current moment is calculated according to a given control parameter, the dynamic performance of the control input value is corrected through a lead-lag link and the corrected value is then transmitted to the DCS. According to the invention, the calculation complexity for multivariable prediction control is simplified and the control period of multivariable prediction control is reduced distinctively, and control problems in quick reaction processes of the ethylene cracking furnace and the like can be solved effectively.

Aspects of the invention support simultaneous operation of a cooling side and a heating side of an apparatus to change the temperatures of a cooling serving surface and a heating serving surface, respectively. A cooling semiconductor device (which may comprise one or more Peltier devices) transfers heat from its top to its bottom while a heating semiconductor device (which may similarly comprise one or more Peltier devices) transfers heat from its bottom to its top. A heat pipe transfers waste heat from the cooling semiconductor device's bottom to the heating semiconductor device's bottom and waste cold from the heating semiconductor device's bottom to the cooling semiconductor device's bottom.

The invention relates to a brushless direct current motor rotor position detection method based on single-phase inductance detection. The brushless direct current motor rotor position detection methodincludes the following steps that a detection vector with the time duration being delta T1 is applied to a motor stator winding, the detection phase current is sampled at the beginning and end of vector application correspondingly, and the current change rate is obtained through subtraction of two values; a driving vector with the time duration being delta T2 is applied to the motor stator winding to drive a motor to run; induction energy is released slowly and the motor driving current is maintained by applying a circulation follow current vector in the remaining time of the control period;the variation trend of frac{d}{d<t>} is judged; and the execution steps are repeated continuously after a motor rotor passes through a switching point, and the motor rotor is switched to the next section after waiting for a delay at an electrical angle of 30 degrees.