48results about How to "Solve the problem of dead zone" patented technology

An embodiment of the invention discloses a direct adaptive control method and a direct adaptive control device. The direct adaptive control method in the embodiment of the invention includes building dead zone and fault nonlinearity dynamic models according to dead zones and fault nonlinearity in control systems; constructing inverse functions of the dead zones and compensating the dead zone and fault nonlinearity dynamic models; compensating compensation errors and fault nonlinearity kinetic models in executors in the dead zones. The compensation errors are generated due to dead zone inverse compensation processes. The direct adaptive control method and the direct adaptive control device have the advantages that the technical problem of dead zones and fault nonlinearity in nonlinear systems can be solved, nonlinearity can be effectively compensated, and the operation stability and the excellent tracking performance of the systems can be ultimately guaranteed.

The invention provides an automotive active suspension control method with a dead-zone executer, which relates to automotive active suspension control methods. The invention is the automotive active suspension control method with the dead-zone executer, which is to solve problems that the prior art cannot meet requirements of keeping comfort under uneven pavement conditions and the lowering of the actual performance is not taken into consideration in the controller designing process of the prior art. The method comprises the following steps of step 1, establishing a mathematical model of a dead zone of the executer in an active suspension system; step 2, establishing a 1 / 4 automotive active suspension module with a dead-zone characteristic executer; step 3, designing a dead-zone compensating controller by means of the 1 / 4 automotive active suspension module with the dead-zone characteristic executer; step 4, verifying a closed-loop system, in which the dead-zone compensating controller is introduced into the 1 / 4 automotive active suspension system, by using an Lyapunoy function; and the like. The automotive active suspension control method with the dead-zone executer, provided by the invention, is applied to the control field of automotive active suspensions.

The invention relates to a drive circuit of a synchronous rectification DC / DC (Direct Current / Direct Current) convertor. The drive circuit and a switch level commonly form the synchronous rectification DC / DC convertor, wherein the switch level comprises a main switch tube, a synchronous rectifier tube, a PWM (Pulse-Width Modulation) controller, an inductance L, a capacitance C and a resistance R; the drive circuit comprises a main switch tube drive module and a synchronous rectifier tube drive module; an output signal PG of the main switch tube drive module is connected with a grid electrode of the main switch tube, and is connected to one input end of the synchronous rectifier tube drive module; one input end of the main switch tube drive module is connected with a PD signal output end of the PWM controller; an output signal NG of the synchronous rectifier tube drive module is connected with a grid electrode of the synchronous rectifier tube and is connected to the other input end of the main switch tube drive module; and the other input end of the synchronous rectifier tube drive module is connected with an ND signal output end of the PWM controller.

A femtosecond laser distance measuring device comprises a first reference light path, a second reference light path and a measuring light path. The first reference light path and the second reference light path have the fixed optical path difference and are each provided with a shutter. The shutters are used for switching the reference light paths in the distance measuring process so as to use the corresponding reference light for measurement. A femtosecond laser distance measuring method comprises the steps that dead zone ranges are set for interference signals of first reference light and second reference light; in the data collection process, when the interference signals of measuring light enter the dead zone range of the reference light in use, the shutter corresponding to the reference light path is controlled to be closed, and the shutter corresponding to the other reference light path is opened; when the measured object distance is calculated, the fixed optical path difference is used for compensating the measuring distance difference caused by switching of the two reference light paths. The dead zone problem existing in femtosecond laser distance measuring can be effectively solved.

The invention discloses a semi-active control method of an energy reclaiming type semi-active suspension system. The semi-active control method is characterized by obtaining an ideal electromagnetic damping force Fref required to be output by a linear motor through a skyhook and groudhook suspension damping semi-active control strategy; dividing the ideal electromagnetic damping force Fref by an electromagnetic damping coefficient ki, thus obtaining a needed reference current iref; collecting a real current value ireal in a motor winding through a current sensor; inputting a difference value e of the reference current iref and the real current value ireal and a difference value change rate ec into a fuzzy-PI (Proportion Integration) mixed controller; outputting two paths of pulse signals by the fuzzy-PI mixed controller to control the switching on and off of an MOS (Metal Oxide Semiconductor) transistor in a semi-active control circuit, thus realizing semi-active control.

The invention relates to an inclinometer for similar rotary transformers. The inclinometer comprises a sensitive structure and a shell, wherein the sensitive structure comprises a first reception polar plate, an emission polar plate and a second reception polar plate; the first reception polar plate, the emission polar plate and the second reception polar plate are alternately stacked in sequenceto form a sandwich-like structure which is placed in the shell; the first reception polar plate, the emission polar plate and the second reception polar plate are the same in the aspect of size and the distances between every two adjacent polar plates are the same; the first reception polar plate, the second reception polar plate and the shell form an enclosed cylindrical space; dielectric liquidis sealed in the enclosed cylindrical space; and under any angle, the liquid level of the dielectric liquid is coincided with the centers of the three polar plates. The invention discloses a variable-electrode area differential capacitive inclination sensitive device structure which is high in sensitivity, wide in dynamic range, good in frequency response characteristic and low in cost and can bewidely applied in inclination sensing and test instrument measurement in the field of test.

The invention relates to a high-speed phase detector, in particular to a high-speed phase detector based on the single-phase-clock dynamic CMOS technology, belonging to the technical field of signal processing and the circuit thereof. Based on the traditional phase detector, a time delay module is added to a feedback loop, so that no dead zone exists when the phase detector is in operation; and ahigh speed D trigger is used for replacing the traditional low speed D trigger, thereby causing the working speed of the phase detector to reach 900 MHz. The phase detector has the advantages of highworking speed, easy manufacture, and no dead zone during the operation, and is especially suitable for precisely differentiating the phase difference of two input signals in a delay-locked loop.

Provided is a large view field optical imaging system based on a computing imaging technology. An imaging system structure of a shared primary mirror, a micro lens array and a detector array is adopted. Incident light respectively passes through the shared primary mirror and the micro lens array and finally reaches the detector array to perform imaging, image restoration (removing influence of spherical aberration on image quality) is performed on each subimage through the computing imaging technology, and a whole clear image can be obtained after registering compositing is performed on each subimage. The shared primary mirror is a single core sphere mirror composed of two semisphere mirrors. The whole optical imaging system is simple in structure, fully symmetrical and easy to process, install and test, has the advantages of extra large view field and low structural complexity and the like, and is particularly suitable for large-range search of space targets and stratosphere air surveillance and the like.

The invention discloses an integrated narrow-frame photoelectric detector and a manufacturing method thereof, which can be used in the fields of low-light detection, particle detection, nuclear radiation detection, etc. The detection area ratio, and the micro-channel plate electron multiplier assembly is welded, the technical problem of poor insulation due to the thin insulating gasket. The integrated narrow-frame photodetector includes a cathode window, a photocathode, a microchannel plate electron multiplier, an insulating tube case, a charge collecting anode, an electrode lead, and an indium sealing tank. At the same time, the present invention also proposes a manufacturing method of an integrated narrow-frame photodetector, which has the advantages of high detection efficiency, large effective detection area ratio, compact structure, and easy processing.

The invention relates to a configurable frequency synthesis circuit based on a delay locked loop. The circuit comprises the delay locked loop, a frequency synthesizer and a configuring SRAM, wherein, the delay locked loop consists of a phase discriminator, a controller and a variable delay chain; and the frequency synthesizer consists of a frequency doubling synthesizer and a frequency division synthesizer. The phase discriminator receives a reference clock and a feedback clock and outputs comparison signals and locking signals after phase demodulation comparison; the comparison signals and the locking signals are processed by the controller, and the controller outputs control voltage then in order to enable the variable delay chain to generate N phase clocks that are output to the frequency synthesizer; and the frequency doubling synthesizer and the frequency division synthesizer enable the set / reset time of a R / S trigger in the frequency doubling synthesizer to generate frequency doubling clock signals under the control of the configuring SRAM, and lead the set / reset time of the R / S trigger in the frequency division synthesizer to generate frequency division clock signals. The configurable frequency synthesis circuit has simple circuit organization, flexibly changes a frequency synthesis coefficient by changing the code flow value in the embedded configuring SRAM so as to obtain a frequency division coefficient and a frequency doubling coefficient as required, and can be applied to a field programmable logic array.

The invention discloses a single-polarity-controlled three-phase two-level inverter space voltage vector modulation algorithm, which is characterized in that a carrier triangular wave or a sawtooth wave controlled by a single polarity and a group of modulation waves expressed by utilizing a piecewise function are used, and an on-off signal is transmitted from an intersection point of the carrier wave and the modulation wave so as to realize the three-phase two-level inverter space voltage vector modulation. By adopting the algorithm, not only the same modulation effect with the conventional three-phase two-level inverter space voltage vector modulation algorithm SVPWM be realized, such as the voltage utilization rate is high, and a circular magnetic chain is generated, but also no dead-corner protection requirement is needed, the waveform distortion problem can be avoided, the on-off times can be half reduced, and the algorithm has the advantage that the on-off loss is small.

The invention relates to a drive circuit of a synchronous rectification DC / DC (Direct Current / Direct Current) convertor. The drive circuit and a switch level commonly form the synchronous rectification DC / DC convertor, wherein the switch level comprises a main switch tube, a synchronous rectifier tube, a PWM (Pulse-Width Modulation) controller, an inductance L, a capacitance C and a resistance R; the drive circuit comprises a main switch tube drive module and a synchronous rectifier tube drive module; an output signal PG of the main switch tube drive module is connected with a grid electrode of the main switch tube, and is connected to one input end of the synchronous rectifier tube drive module; one input end of the main switch tube drive module is connected with a PD signal output end of the PWM controller; an output signal NG of the synchronous rectifier tube drive module is connected with a grid electrode of the synchronous rectifier tube and is connected to the other input end of the main switch tube drive module; and the other input end of the synchronous rectifier tube drive module is connected with an ND signal output end of the PWM controller.

The invention provides a tool tray for an automobile electronic controller, and the tool tray can effectively solve the problem that dead zones and blind zones exist in the assembling process. The tool tray for the automobile electronic controller comprises a base, the base is provided with a straight slot, and supporting seats are fixed to the positions, at the two ends of the straight slot, on the base; a rotary table is connected between the supporting seats through shafts, and a rotating device is fixed to the positions, at the ends of the outer sides of the supporting seats, on the base; the rotating device comprises a shell, the shell is internally provided with a turnplate, and the turnplate is in coaxial connection with the rotary table; and the outer circle face of the turnplate is provided with through holes at intervals, and a bolt penetrates through a trepanning slot in the shell to be inserted into the through holes.