38 results about "Linear control systems" patented technology

A linear motion control device for use in a linear control system is presented. The linear motion control device includes a coil driver to drive a coil that, when driven, effects a linear movement by a motion device having a magnet. The linear motion control device also includes a magnetic field sensor to detect a magnetic field associated with the linear movement and an interface to connect an output of the magnetic field sensor and an input of the coil driver to an external controller. The interface includes a feedback loop to relate the magnetic field sensor output signal to the coil driver input.

A linearity control system includes a series of linearity control compositions, each thereof includes white blood cell analogs and stabilized red blood cells in a suspension medium. The concentration of the white blood cell analogs in the series of control compositions increases from 0.2×103 to 800×103 analogs per microliter, and the concentration of the white blood cell analogs in at least one control composition is greater than 120×103 analogs per microliter. The stabilized red blood cells facilitate mono-dispersion of the white blood cell analogs in the suspension medium by gently mixing. The control compositions further include platelet analogs, or additionally include reticulocyte and / or nucleated red blood cell analogs. The linearity control system allows the verification of the reportable measurement range and linearity of the measurements of hematology analyzers for white blood cells, red blood cells and platelets in extended concentration ranges.

The invention relates to an ultra-pure self-adaptive nonlinear control system for an internal thermally coupled distillation column. The system comprises a field intelligent instrument and a distributed control system (DCS) which are directly connected with the internal thermally coupled distillation column, wherein the DCS comprises a storage device, a control station and an upper computer; the field intelligent instrument is connected with the storage device, the control station and the upper computer; and the upper computer comprises an ultra-pure self-adaptive nonlinear controller which is used for calculating and outputting control variable values of the internal thermally coupled distillation column and comprises a component deduction module, a self-adaptive parameter correction module and an ultra-pure self-adaptive nonlinear control law solving module. The invention also provides an ultra-pure self-adaptive nonlinear control method for the internal thermally coupled distillation column. The control system and the method of the invention can well overcome the strong nonlinear characteristics of the ultra-pure internal thermally coupled distillation column, and have high on-line operational speed, and good servo tracking control effect and interference suppression effect.

The invention discloses a modeling method for a nonlinear control system of an aero-engine. The steps include: setting the initial value of a nonlinear adaptive filter for identifying the input and output of the control system, recording the current and historical input of the control system, and calculating the The input vector obtained from the above input and the FIR filter weight inner product operation, the FIR filter output is obtained, and its local interval index and local normalized coordinates in the spline interpolator are obtained, and the output of the spline interpolator is generated, which is collected by the sensor The output of the control system at the current moment is compared with the output of the spline interpolator to obtain the filter error, and the FIR filter weight and the gradient of the spline interpolation point are calculated respectively according to the filter error, and the FIR filter is calculated respectively according to the gradient The gradient momentum of the weight and the gradient momentum of the spline interpolation point update the FIR filter weight vector and the coordinates of the spline interpolation point respectively, and continue the adaptive process at the next moment from the second step.

The invention relates to a method for tuning PID parameters of a linearity system with differentiation. The method includes identifying the controlled process of currently known type linearity system with differentiation to obtain model parameters, selecting PID controller types based on control requirement according to the type of the controlled process, searching corresponding a PID parameter tuning formula from linearity system with differentiation PID controller parameter tuning table based on multi-capacity inertia standard transfer function according to the type of the controlled process and the type of the PID controller, and applying the calculated PID parameters to control a controlled process. No discussion on tuning PID parameters of a linearity system with differentiation is available in the prior art. The PID parameter tuning method is based on complete theoretical analysis and derivation, less known parameters are needed, and the calculation is simple. The method is applicable to linear control system with requirements on rapid reaction and large overshooting. The method is highly stable and robust and overcomes the defect of wearing of a performer due to improper tuning of PID parameters.

The invention relates to a self-adaptive nonlinear control system for an internal thermally coupled distillation column. The system comprises a field intelligent instrument and a distributed control system (DCS) which are directly connected with the internal thermally coupled distillation column, wherein the DCS comprises a storage device, a control station and an upper computer; the field intelligent instrument is connected with the storage device, the control station and the upper computer; and the upper computer comprises a self-adaptive nonlinear controller which is used for calculating and outputting control variable values of the internal thermally coupled distillation column and comprises a component deduction module, a self-adaptive model parameter correction module and a self-adaptive nonlinear control law solving module. The invention also provides a self-adaptive nonlinear control method for the internal thermally coupled distillation column. The control system and the method of the invention can well overcome the strong nonlinear characteristics of the internal thermally coupled distillation column, and have high on-line operational speed, and good servo tracking control effect and interference suppression effect.