30 results about "Bang–bang control" patented technology

The invention provides a method for suppressing brushless direct current motor phase change torque fluctuation based on Bang-bang control. The method includes the following steps that (1), a work area of a motor is judged; (2), if the motor is located in a phase change work area, a torque fluctuation index is calculated and compared with an upper limiting value and a lower limiting value, and the step(3) is executed, and if the motor is located in a non-phase-change work area, the step (1) is executed again; the torque fluctuation index is a parameter reflecting the intensity of the torque fluctuation, and the upper limiting value and the lower limiting value are set values; (3), according to the comparison result between the torque fluctuation index, and the upper and lower limiting values, a turn-off phase of the motor is controlled to be turned off and communicated. The defects that according to an existing solution of suppressing the brushless direct current motor torque fluctuation, the optimal phase change moment is difficult to determine, implementation can not be performed within a full-speed range of the motor, and a control strategy is complex are overcome. The method can be effective and practical within the full-speed running range of the motor, the problem of phase change torque pulses of the motor is effectively solved, and running reliability of the motor is greatly improved.

A mechanism for regulating an engine by using an actuator that is controlled in bang-bang mode, in which non-linearities are introduced in the control strategy in order to avoid putting excessive demand on an electric motor. The actuator is controlled by power supply pulses, which is a specific type of bang-bang control and, therefore, the actuator can receive a certain number of discrete commands. In one example, the actuator can receive two types of commands, for rotating in one direction and for rotating in the other direction.

The invention relates to an automatic control method suitable for a closed-circuit cement combined grinding system. Four control loops, including a powder selecting machine rotating speed loop, a cement granularity loop, a weighing warehouse material level loop and an ultrafine fly ash elevator current loop, are extracted from the closed-circuit combined grinding system. As for the powder selecting machine rotating speed loop, bang-bang control is adopted to constrain an error of ground elevator current, and Fuzzy control is applied so that the tracking error of the ground elevator current is converged to be bounded; as for the cement granularity loop, bang-bang control and Fuzzy-PID control are adopted to control material feeding mount and powder selecting machine rotating speed; as for the weighing warehouse material level loop, bang-bang control is adopted to control the total given amount; and as for the ultrafine fly ash elevator current loop, bang-bang control is adopted to control large proportion of fine powder. Phenomena of grinding plugging, full grinding, empty grinding and ultrafine fly ash and ground elevator overload are effectively avoided so that cement production efficiency is effectively enhanced.

The invention discloses a raw material grinding automatic control method. In an automatic state, During amplitude control of a lifting and falling roller, an amplitude scope is tested mainly through observation and lifting and falling operation of a grinding roller is carried out. During control of water pump opening, operation conditions of a material layer thickness and a mill output temperature are integrated, a pid fuzzy control operation method is employed, and the water pump opening value is adjusted to achieve stabilization control effects. During the feed control link, feed quantity is controlled according to a current of a milling machine and a current of a powder selection machine and furthermore the current and the amplitude of the milling machine are stabilized. The problem that parameter adjustment cannot be tracked rapidly in a routine PID is avoided, according to characteristics that fuzzy control is independent from an accurate mathematic model and suitable for non-linear and large time delay production processes, by utilization of fuzzy PID and Bang-Bang control methods, a tracking error convergence speed is quickened, thus the vertical milling control process has a stable dynamic performance, milling machine vibration is reduced, the yield is raised and accurate and rapid control effects are achieved.