17 results about "Loop control" patented technology

The invention discloses a non-road diesel engine combustor DPF regeneration temperature control method. According to the method, control over the regeneration temperature of a non-road diesel engine combustor DPF is completed by combining feedforward control and PID feedback control. The method has the advantages that closed-loop control is stable and feedforward control is fast. The control precision of the regeneration temperature of a DPF catalytic converter is improved. Under various diesel engine working conditions, the error of the actual temperature of an inlet of the DPF catalytic converter and the DPF target regeneration temperature can be controlled within 25 DEG C. Accordingly, a DPF system can conduct reliable regeneration temperature management under various working conditions.

The invention discloses a double DSP embedded type welding process visual feedback control system for welding seam tracking and welding quality control in welding automation, comprising a DSP image processing module, a DSP feedback control module, a power and reset module, a visual interface module, an analog video coding module and a USB control module. The DSP image processing module extracts the eigenvalues of a welding region image transmitted from the video interface module and transmits to the DSP feedback control module, the DSP feedback control module outputs corresponding signals according to the eigenvalues, and finishes close-loop control of welding seam tracking and welding quality. By this invention, welding seam tracking and welding seam shaping control can be carried out without a host computer.

The invention discloses an electric automobile and an electric current loop control method and device for a permanent magnet synchronous motor of the electric automobile. The method includes the following steps that traveling working condition information of the electric automobile, the d-axis given current and the q-axis given current of the permanent magnet synchronous motor and the d-axis actual current and the q-axis actual current of the permanent magnet synchronous motor are obtained; according to traveling working condition information and a preset neural network algorithm, a d-axis proportionality coefficient, a d-axis integral coefficient, a q-axis proportionality coefficient, a q-axis integral coefficient and the PWM switching frequency are calculated; and the d-axis voltage is calculated according to the d-axis given current, the d-axis actual current, the d-axis proportionality coefficient, the d-axis integral coefficient and a d-axis current PI control algorithm, the q-axis voltage is calculated according to the q-axis given current, the q-axis actual current, the q-axis proportionality coefficient, the q-axis integral coefficient and a q-axis current PI control algorithm, and therefore vector control can be conducted on the permanent magnet synchronous motor according to the d-axis voltage, the q-axis voltage and the PWM switching frequency. Therefore, through setting of control parameters matched with the traveling working condition, the better rapid respond capacity is achieved, and overshooting is reduced.

The invention provides a multifunctional power electronics test system for electromobile. The system comprise a main controller and eight distributed modules, namely, a motor driving subsystem, a battery management subsystem, a power battery pack, a simulated battery pack, a charging device, a DC/DC/AC module, a motor measuring device and an adjustable load, and each distributed module comprises a microcontroller; the main controller controls the microcontrollers of the distributed module to control the whole system; the microcontrollers of the distributed modules is in data communication with the main controller to upload data to the main controller; the battery management system, the power battery pack, the simulated battery pack and the charging device form a charging closed-loop control subsystem; the motor driving subsystem, the adjustable load and the motor measuring device form a motor closed-loop control subsystem; and the main controller receives and records state and power feature data of the charging device, the power/simulation battery pack, the battery management subsystem and the motor driving subsystem, and displays, calculates and analyzes the data in real time.

The invention discloses a high-voltage loop control device and method for an electric automobile, and belongs to the field of a new energy automobile. The control device comprises a temperature monitoring module, an electric current monitoring module and a control module. Through monitoring the real-time temperature of each of temperature monitoring points in a high-voltage loop, because when the automobile normally travels, a long-time overload current cannot occur in the high-voltage loop circuit, the temperature of each of the temperature monitoring points can be maintained within a set temperature range; when the real-time temperature of any of the temperature monitoring points is higher than the corresponding preset temperature, the situation that the current temperature monitoring point is abnormal is indicated; besides, through monitoring the electric current of a DC bus, when the real-time electric current of the DC bus exceeds a set electric current, the high-voltage loop can be damaged, so that if the output power of a power battery pack is reduced immediately or the high-voltage loop is cut off, the situation that the structure of the high-voltage loop is burn up can be avoided; and during design, a reserved design margin is reduced, and the design cost and the design difficulty are reduced.

The invention discloses a composite sliding mode speed control method and system for a cylindrical permanent magnet linear synchronous motor, and belongs to the technical field of motor control. A terminal attractor is introduced on the basis of an exponential reaching law, and a new sliding mode reaching law is provided. Based on the reaching law, a sliding mode speed controller of the cylindrical permanent magnet linear synchronous motor is established, the convergence speed of the system state can be increased, and the chattering phenomenon can be effectively restrained. Meanwhile, an extended sliding mode disturbance observer is designed and used for estimating system lumped disturbance and providing feedforward compensation for a speed controller, and a composite sliding mode speed control strategy is formed. The cylindrical permanent magnet linear synchronous motor adopts a double-closed-loop control strategy of composite sliding mode speed control and current PI control based on a reaching law and an extended sliding mode disturbance observer. According to the method, the dynamic response speed of the system is increased, the anti-interference capability and robustness of the system are enhanced, and the operation performance and reliability of the motor in a complex working environment are improved.

The invention discloses an RF (radio frequency)-SQUID (superconducting quantum interference device) application-based high-stability frequency automatic controller. The controller comprises a frequency tracking unit and a phase compensation unit; the frequency tracking unit is electrically connected with the phase compensation unit; the frequency tracking unit is used for capturing and tracking the resonant frequency of an LC circuit in an RF-SQUID application; and the phase compensation unit is used for compensating phase difference caused by different cable lengths in the RF-SQUID application. According to the RF (radio frequency)-SQUID (superconducting quantum interference device) application-based high-stability frequency automatic controller of the invention, automatic frequency control is used to replace conventional open-loop control, and the automatic frequency control has the characteristic of stable output frequency and is not affected by external environments; and the phasecompensation circuit is additionally adopted; and therefore, the high-stability frequency automatic controller has the advantages of wider application environment range and higher test precision. Theadvantages of the high-stability frequency automatic controller can be applied to geomagnetic exploration, physical principle verification, non-destructive detection, and low-frequency telecommunication and other fields.

The invention discloses a closed-loop control device of an optometry unit. The device comprises a base; a rectangular frame is fixedly connected to the upper end face of the base; a bottom plate is arranged above the rectangular frame; a movable seat is fixedly connected to the upper end face of the bottom plate; a vertical plate is arranged on the right end face of the movable seat; a connectingblock is arranged at the upper end of the vertical plate; the connecting block is fixedly connected with a rotating plate; the bottom end face of the rotating plate is connected with an optometry assembly; the right side wall of the base is fixedly connected with a transverse frame; the upper end of the transverse frame is connected with a vertical frame; and a head supporting plate is arranged above the vertical frame. The device is simple in structure and is clear and easy to understand in construction; rotation, lifting and horizontal movement of the optometry assembly can be achieved through a motor, so that the adjustment is convenient; transverse and vertical movement of the head supporting plate can be achieved through the motor, so that the control and adjustment are convenient; and the device is easy to operate, convenient to adjust, high in accuracy, high in automation degree, simple in principle, good in adjustment and control effect, strong in functionality and worthy of popularization.

The invention belongs to the field of aviation permanent magnet synchronous motor control systems, and discloses an AD2S1210-based aviation permanent magnet motor rotor position angle redundancy control system and method. The space vector control FOC algorithm unit is used for generating six paths of PWM (Pulse Width Modulation) waves to drive the three-phase bridge type inversion module to be switched on and switched off by collecting armature current, rotor position angle and rotating speed information of the permanent magnet synchronous motor and adopting a rotating speed and current double-closed-loop control strategy, so that the permanent magnet synchronous motor is controlled to reach a target rotating speed or torque; the AD2S1210 rotary transformer decoding chip is used for collecting rotor position angle information and rotating speed information of a rotary transformer coaxially installed on the permanent magnet synchronous motor. The rotor position angle information and the rotating speed information are decoded and then sent to the position angle redundancy control algorithm unit; and the position angle redundancy control algorithm unit is used for judging the received rotor position angle information, outputting a correct position angle signal to the space vector control FOC algorithm unit, converting the received rotating speed information and outputting the converted rotating speed information to the space vector control FOC algorithm unit.

The invention discloses a light master control system. The system comprises a loop controller, at least one lamp driving controller and a controlled lamp. The system is characterized in that an alternating current output end of the loop controller and an alternating current input end of the lamp driving controller form loop connection in the same lighting circuit, an output end of the lamp drivingcontroller is electrically connected with a controlled lamp, the loop controller is used for controlling the length of a transient change time interval of the alternating current output characteristic of a lighting loop, after the transient change time interval, continuous conduction is recovered, so on and off control of the controlled lamp at an output end of the lamp driving controller is realized through the lamp driving controller on the premise of uninterrupted power supply of the lighting loop. The system is advantaged in that the time interval of power-on and power-off of the lightingloop is ingeniously utilized, simple group control of a plurality of lighting lamps is realized at the lowest cost, and the function of system lamp control is added on the basis of the traditional independent lighting.

The embodiment of the invention provides a cruise control method and device and an engineering vehicle. The cruise control method comprises the steps of obtaining the hoisting speed of a hoisting mechanism at a current moment when the hoisting mechanism is in a cruise manner; and based on the hoisting speed at the current moment and the stored target hoisting speed, adjusting parameters of a hoisting control assembly through closed-loop control, so that the difference value between the actual hoisting speed at the next moment and the target hoisting speed is within the preset error range. According to the technical scheme, the hoisting speed is monitored in real time in the cruise process, related parameters of the hoisting control assembly are adjusted through closed-loop feedback control, so that the hoisting speed is adjusted in time, it is guaranteed that the speed of the hoisting mechanism is constant, and adverse effects on the stability of the hoisting mechanism due to unstablefactors such as control valves are avoided.

A full-automatic wort oxygenated yeast adding machine and a wort oxygenated yeast adding method relate to the technical fields of multi-material mixing processes of biological engineering, fermentation engineering, biological pharmacy, fine chemical engineering and chemical engineering. The full-automatic wort oxygenated yeast adding machine comprises a stand, a PLC (Programmable Logic Controller) control cabinet and a Venturi tube, wherein the PLC control cabinet is arranged on the outer side of the upper end of the stand; the Venturi tube is arranged above the stand; and the full-automatic wort oxygenated yeast adding machine is externally connected with an air compressor, a cold wort inlet, a fermentation tank, a yeast propagating tank and a steam pressure reducing station. The wort oxygenated yeast adding method comprises the following steps of: introducing cold wort through the cold wort inlet; introducing air into the air compressor; introducing yeast into the yeast propagating tank; mixing the cold wort, the air and the yeast in the Venturi tube; after mixing enabling the mixture to enter the fermentation tank. The wort oxygenated yeast adding method disclosed by the invention is feasible; due to the application of an air quality flowmeter and a volumetric flowmeter, reliable preconditions for accurate addition of oxygen and yeast to the wort are provided; the establishment of a mathematical model method provides reliable reference for the accurate addition of the oxygen and the yeast to the wort; due to the application of an open-loop control principle, the phenomenon of feedback regulation lagging in a closed-loop control is avoided; and the automatic control over the whole process is realized, so that the labor intensity and the human error probability are greatly reduced and further the quality and the uniformity of products are greatly improved.