237results about How to "Suppress jitter" patented technology

The invention provides an inhibiting method and system for battery electric vehicle shaking. According to the method, the current needed torque of a driving motor is obtained firstly; then whether the needed torque needs compensation or not is judged; if the needed torque needs to be compensated, a torque compensation step is conducted; if not, the driving motor is controlled to operate according to the needed torque; and the torque compensation step comprises the content that the compensation torque is obtained through a preset algorithm according to the current motor rotating speed of the driving motor, the compensation torque is used to compensate the needed torque, the output torque is obtained, and the driving motor is controlled to operate according to the output torque. The output torque of the driving motor is obtained through compensation of the compensation torque obtained according to the current motor rotating speed, so that fluctuation of the rotating speed of the driving motor can be eliminated, shaking of the electric vehicle is inhibited, and comfort of a driver in driving is improved.

The invention discloses a method, device and system for suppressing shaking of an electric automobile. The method, device and system are used for suppressing the shaking of the electric automobile andimproving the driving comfort level. The method includes the steps that a rotation speed signal of a motor is obtained; Fourier analysis is conducted on the rotation speed signal, and the frequency and the amplitude of an effective component, causing rotation speed shaking, in the rotation speed signal are obtained, wherein rotation speed shaking is shaking caused by the non-linear relationship between traction torque and the resistance moment of the electric automobile; according to the frequency and the amplitude of the effective component causing rotation speed shaking, a parameter for suppressing rotation speed shaking is obtained; according to the parameter for suppressing rotation speed shaking and the rotation speed signal, compensation torque is obtained through a differential inertial element and a band-pass filtering element; and the compensation torque and given torque are superposed so as to suppress the rotation speed shaking. Due to the fact that the shaking of the electric automobile is suppressed, mechanical resonance generated in the shaking process is reduced, and therefore hardware wear of the electric automobile is reduced.

The invention relates to terminal devices and discloses an estimation method a terminal device of the electricity quantity of a battery. According to the invention, a sampling battery voltage is firstly compensated and then substituted into a corresponding relationship table of battery voltage and battery electricity quantity to obtain a corresponding battery electricity quantity for displaying, wherein the corresponding relationship table of the battery voltage and the battery electricity quantity is obtained according to a battery discharging curve graph. The voltage reduction of a high-power-consumption load, which is caused by a large discharging quantity, is compensated to enable the compensated voltage of the load to match with the voltage in a standard discharging curve, so that the problem that electricity quantity display errors are large in the voltage detection method can be avoided, and the working and stand-by time of the system can be prolonged. Besides, the estimation method of the electricity quantity of the battery is still based on the principle of the voltage detection method and does not need the current detection, so that the technical scheme can be achieved without increasing the hardware cost, namely, the hardware cost is low.

Optical information recording is achieved at high speed such as sixthfold to eightfold speed of DVD while suppressing jitter by a high-speed recording strategy such as a 2T period strategy, by once reducing the optical power of the optical beam used for optical recording, when starting recording of an amorphous mark pattern after the step of forming a crystalline space region but before the step of irradiating the optical beam with a peak power level for the mark formation, such that the optical power of the optical beam is reduced below the erasing optical power used for forming the crystalline space region.

Conventionally, when generating an image in which hand-shake is suppressed, by combining a plurality of images, an image quality may be degraded by performing a combination process even in the illuminance condition when no hand-shake occurs and the linear characteristic of luminance information may be deteriorated when combining a plurality of images, some which are inappropriately exposed. In order to solve these problems, it is possible to provide an imaging device capable of combining a first image of a size smaller than a target image obtained by pixel addition average and pixel addition with a second image having an amplified gain to obtain an appropriate exposure and a plenty of noise, so as to generate the target image and capable of varying the synthesis ratio of the first image and the second image according to the temperature condition and the like so as to obtain an image in which no hand-shake or blur is contained under any illuminance condition and noise is suppressed.

The invention discloses an optical axis inertia stability datum reference device which comprises a base, a moveable connecting part, a stable platform unit, an adjusting unit, a control unit and a reference light source, wherein the stable platform unit is connected with the other end of the moveable connecting part, is capable of being moved relative to the base, and is provided with a stable platform and an inertia sensation component which is fixedly mounted with the stable platform; the adjusting unit is mounted on the base and is used for adjusting a real-time position of the stable platform relative to the base; the input end of the control unit is connected with the inertia sensation component; the output end of the control unit is connected with the adjusting unit and is used for receiving an inertia sensation signal transmitted from the inertia sensation component, used for carrying out processing calculation on the inertia sensation signal, and used for outputting a control signal to the adjusting unit to enable the adjusting unit to carry out adjustment; the reference light source is fixedly mounted on the stable platform; the inertia sensation component is capable of measuring angle velocities of at least two spatial freedom degrees of the stable platform and a posture variations of the stable platform; correspondingly, the inertia sensation signal comprises the angle velocities of at least two spatial freedom degrees of the stable platform and the posture variations of the stable platform.

The invention provides a control method for an auxiliary starting engine of a power split hybrid electric vehicle brake. The control method for the auxiliary starting engine of the power split hybridelectric vehicle brake includes the steps that after a whole vehicle is powered on with high voltage and if the engine of the vehicle is determined to need starting, a first brake is controlled to beunlocked, and a hydraulic electric oil pump is simultaneously controlled to pressurize a second brake until the second brake is locked and second brake lock torque is obtained; then first motor demandtorque, second motor demand torque and preset engine demand torque are correspondingly and respectively sent to a first motor controller, a second motor controller and an engine controller through avehicle controller to execute accordingly; at the same time, the vehicle controller controls the second brake to output the second brake lock torque to a small sun gear of a double planetary row; whenengine speed reaches an engine ignition speed threshold A, the engine starts to inject fuel and ignite successfully, and then the starting of the engine is completed. The control method for the auxiliary starting engine of the power split hybrid electric vehicle brake has the advantages of being simple and effectively improving ride comfort and power performance of the hybrid electric vehicle during operation.

To provide a duty detection circuit including: a plurality of duty detectors that detect a duty ratio of internal clocks; a controller that controls the plurality of duty detectors so that the plurality of duty detectors operates in different phases from one another; and an output selecting unit that selects one of duty detection signals from the plurality of duty detectors. According to the present invention, since the duty detectors operate in the different phases from one another, the output selecting unit can output a duty detection signal with a higher frequency than a generation frequency with which each duty detector generates the duty detection signal. Accordingly, when the duty detection circuit according to the present invention is used to adjust a clock of the DLL circuit, a control period of the DLL circuit can be reduced.

A differential amplifier circuit includes: a first field-effect transistor being operable base on a non-inverted input; a first load circuit which is connected to the drain of the first field-effect transistor; a first current control circuit which is connected to the source of the first field-effect transistor; a second field-effect transistor being operable base on an inverted input; a second load circuit which is connected to the drain of the second field-effect transistor; a second current control circuit which is connected to the source of the second field-effect transistor; and a gain compensation circuit which is connected between the source of the first field-effect transistor and the source of the second field-effect transistor, thereby attaining a high-speed differential amplifier circuit with low jitters.

The invention discloses a high-speed high-precision 3D printer and mainly relates to the technical field of 3D printing. The high-speed high-precision 3D printer comprises an X-axis module, a Y-axis module, a Z-axis module, an extrusion mechanism, a platform mechanism and a machine casing; the Z-axis module comprises two retaining plates; a Z-axis ball screw and two Z-axis uprights are arranged on the retaining plates; the Z-axis uprights are in pin connection with the machine casing through a plurality of positioning pins; two Z-axis linear guide rails are mounted on the Z-axis uprights; a nut of the Z-axis ball screw and sliders of the Z-axis linear guide rail all are fixed on the platform mechanism; the Y-axis module is fixed at the top ends of the Z-axis uprights; the X-axis module comprises an X-axis upright that is in sliding connection with the Y-axis module in a Y-axis direction; an X-axis ball lead and two X-axis linear guide rails are mounted on the X-axis upright; the extrusion mechanism is mounted on a nut of the X-axis ball screw and the sliders of the two X-axis linear guide rails. The high-speed high-precision 3D printer has the beneficial effects of stable transmission, high mechanical strength, and remarkable increase of precision and speed.

A controlling unit disposed in a PLL circuit controls a phase interpolator to gradually change a phase shift amount applied to a phase shift signal C_PS by a unit of basic delay amount Δ at a timing predetermined in accordance with a modulation profile of an SSC. Further, the controlling unit controls a total phase shift amount applied to the phase shift signal C_PS output from the phase interpolator in one period of a feedback clock signal C_FB obtained by dividing frequency of the phase shift signal C_PS in a way that a difference between the total phase shift amount and a total phase shift amount in a previous one period of C_FB is always equal to or less than the basic delay amount Δ.

A magneto-optical recording medium has a domain wall displacement layer, a recording layer for accumulating information and a switching layer arranged between said domain wall displacement layer and said recording layer and having a Curie temperature lower than those of the latter two layers. The domain wall displacement layer, the switching layer and the recording layer are coupled by exchange coupling at temperature not higher than the Curie temperature of the switching layer. The saturation magnetization of the domain wall displacement layer and the recording layer are in opposite directions to each other when the layers are coupled by exchange coupling at a temperature close to the Curie temperature of the switching layer.

The present invention relates to a video signal processing apparatus for outputting an inputted video signal after subjecting the video signal to time axis correction, particularly to a video signal processing apparatus preferable in the case of subjecting the video signal to image compression. In the case in which a nonstandard signal is inputted to an image compression circuit of an MPEG2 encoder or the like, a drawback of freezing image or generating block noise or the like is resolved. A time axis correcting circuit stores an input signal to a memory and reads the input signal at a timing delayed from V synchronization of the input signal by a predetermined time period. For that purpose, a read synchronizing signal generator is reset at respective input field. A reset position is set to a position preceding the read V synchronization position by 3H through 10H. It is detected whether the input signal is a non-interlace signal or a field length thereof is deviated from a standard value and in these cases, odd / even order or synchronization timing of a synchronizing signal is corrected. Further, when the input signal is a nonstandard signal, the input signal is outputted without passing through the image compression circuit by a changeover switch.

The invention relates to a plasma position information based LIBS (Laser-induced Breakdown Spectroscopy) stabilization method. The method comprises the specific steps of 1) acquiring LIBS signals under different sample positions and corresponding plasma image signals; 2) extracting plasma position information from plasma image information; 3) creating relation functions of an LIBS section area andvalue relative to the corresponding plasma positions through a fitting method, and creating a relation function between LIBS specific spectral line intensity and the corresponding plasma positions through a fitting method; 4) creating a comprehensive correcting function through the relation functions obtained in step 3); and 5) correcting LIBS with unknown position through the correcting function. A characteristic spectral line corrected by the method is high in stability, and reliable spectral line information is provided for quantitative (qualitative) analysis.

The invention provides a holographic grating exposure method adopting heterodyne interference fringe locking control, belonging to the field of spectrum techniques. The existing holographic grating exposure method realized by adopting a linear array CCD (Charge Coupled Device) in the prior art has the problem that high-frequency fringe jitter inhibition effect is poor due to a reason that the response speed of the linear array CCD is slow. A set of holographic grating exposure device and a set of heterodyne interference fringe locking control device are equipped. Interference fringes are locked in real time and are placed on a grating substrate for exposure. The method provided by the invention has the advantages that the interference fringes can be locked at a certain fixed value relative to the phase of the grating substrate during exposure of a holographic grating; since the control bandwidth is larger, the high-frequency fringe jitter can be better inhibited, the contrast of the groove profile of the holographic grating is guaranteed and the manufacturing process level of the holographic grating is improved.

To provide a chain tensioner and a relief valve unit that enable a reduction in the number of parts to be machined and the number of assembling steps, reduce the amount of oil flowing out to the outside, and prevent damage on a check valve, without having to increase the size of the chain tensioner. The chain tensioner includes a check valve unit(150) that suppresses reverse flow of oil flowing into an oil pressure chamber(101), and a relief valve unit(160) that releases the oil when the pressure inside the oil pressure chamber(101) reaches or exceeds a predetermined high pressure. The check valve unit(150) is disposed as a valve element of the relief valve unit(160), and the relief valve unit and the check valve unit are formed integral with each other.

A differential signal output device is disclosed that outputs transmission data as a differential signal. The device includes a first differential signal generation circuit that amplifies a signal representing the transmission data and generates the differential signal from the amplified signal; a dummy data generation circuit that is synchronized with a reference clock of the transmission data and generates dummy data that change only in a bit where the transmission data do not change; and a second differential signal generation circuit that amplifies a signal representing the dummy data and generates another differential signal from the amplified signal.

Disclosed is an output buffer circuit provided with a pre-emphasis function, including a first buffer circuit, receiving a first logic signal to drive a transmission line, and a second buffer circuit. The second buffer circuit includes an inverting buffer, receiving a second logic signal that is in a predetermined logical relationship with respect to the aforementioned first logic signal, and having outputs connected in common with an output of the aforementioned first buffer circuit, a first switch, connected across the inverting buffer and a first power supply, and controlled to be turned on or off based on a signal supplied to a control terminal, and a second switch, connected across the inverting buffer and a second power supply and controlled to be turned on or off based on a signal supplied to a control terminal in association operatively with the first switch. The output buffer circuit also includes first and second capacitors across an input end of the first buffer circuit and a connection node between the inverting buffer and the first switch and across the input end of the first buffer circuit and a connection node between the inverting buffer and the second switch.

The invention discloses a virtual concatenation synchronization system in an optical transport network (OTN) and a method thereof, belonging to the field of optical communications. The system comprises a synchronization unit, a virtual concatenation delay compensation unit, an asynchronous demapping unit, a smooth service acquisition unit, and a service data recovery unit. The method comprises the steps of carrying out virtual concatenation delay compensation by using fixed-point floatation of an optical channel payload unit (OPUk), and recovering service data by combining asynchronous demapping during synchronization process. The technical proposal provided in the invention can effectively inhibit jitter due to synchronization and virtual concatenation delay compensation, thereby solving the deterioration problem of clock jitter performance arising from transport of constant bit rate services via virtual concatenation in the OTN.

An industrial robot vibration suppression method includes recording the given position issued from a control system and actual position information fed by an encoder during moving of a robot, calculating position compensation and speed compensation according to the deviation value between the given position and the feedback position, providing the position compensation to the given position, providing the speed compensation through a speed feed-forward interface, thereby realizing vibration suppression to the robot. According to the method, the position encoder of the industrial robot is useddirectly, external sensors are omitted, and thus, optimization cost is saved, data error caused by arrangement of peripheral devices is avoided. The method cannot only solve the problem about vibration in action of the robot but eliminate vibration in positioning. The position compensation and the speed compensation can be reused if the moving track of the robot does not change since the vibrationsuppression compensation is acquired by study, and accordingly, study on vibration suppression can be omitted.

The invention provides a rudder jitter suppression circuit and a rudder system. The rudder system includes a feedback circuit as well as an adder, a signal amplifying and conditioning circuit, a jitter suppression circuit, a signal processing and power amplifying circuit and a servo rudder which are connected with one another sequentially; the input end of the feedback circuit is connected with the output end of the servo rudder; the first input end of the adder is used for receiving external rudder control signals; the second input end of the adder is connected with the output end of the feedback circuit; and the jitter suppression circuit includes an amplifier, a first one-way conduction element, a second one-way conduction element, a capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor. With the rudder jitter suppression circuit and the rudder system of the invention adopted, interference signals can be effectively filtered out, and at the same time, self-excited oscillation of a resistance-capacitance circuit at the input end of the circuit can be greatly suppressed, which can well suppress the jitter of a rudder in a large-inertia rudder system having high bandwidth requirements, and therefore, the stability of the system can be ensured.

A delay circuit delays an input signal. Further, a level shift circuit, which has a variable level shift amount, is provided between the delay circuit and an OR circuit, thereby making it possible to adjust a time during which a logic of active of the delayed signal is kept. Moreover, the OR circuit performs an OR operation of the input signal and an output signal of the level shift circuit so as to obtain a signal of an OR logic, which drives a light emitting element. With this arrangement, the level shift amount is adjusted in response to a control signal externally supplied, in an optical transmitter arranged such that the input signal and output light emitted from the light emitting element with a delay in the emission, have the equal duty ratio. In this way, property unevenness among finished products of the light emitting element is cancelled out. Thus, it is possible to drive the light emitting element at a higher speed.

The invention relates to a smooth and steady pointing maneuvering control method for a satellite optical load. The method comprises the following steps that 1, the attitude of a satellite body is stabilized; 2, a pointing mechanism of the optical load is controlled to enable pointing mechanism pointing orientation to be maneuvered to a target orientation along a set track; 3, an image stabilizing mechanism is controlled to carry out compensation on optical axis shaking, and the target orientation is stably imaged. The smooth and steady pointing maneuvering control method for the satellite optical load has the following advantages that 1, compared with the satellite body, the pointing mechanism is small in mass and size, high in maneuvering speed and little in energy consumption, and the image stabilizing mechanism is driven by a piezoelectric material, is wide in bandwidth and can effectively carry out compensation on control errors of the pointing mechanism and inhibit optical axis shaking; in addition, in the load optical axis maneuvering process, the stability is high, little pointing shaking is generated, the track is smooth, and the target orientation precision and stability are high; smooth and steady pointing maneuvering is provided for the optical load, and the imaging precision during maneuvering is guaranteed.

The invention discloses a testing device for inhibiting dithering of a speckle image under an aerobic environment with high temperature of 1200 DEG C. The device comprises a light-weight high-temperature ceramic plate, an orthogonal quartz lamp heating array, a light-pervious window, a light-weight ceramic thermal-insulation frame, speckle particles, a panel test piece, a quartz glass square frame, a thermal-insulation light-pervious channel, a light-pervious hole, an MOS camera, a band pass filter, a lens and an image processing computer. In a high-temperature heat test, the temperature rises, the density of hot air decreases, the hot air moves upward, and the difference in upper and lower air densities in a heating area causes an unsteady change in the refractive index of the air to cause dithering of an image, so that the correlation analysis of a digital image fails. In order to obtain a clear image of surface deformation before heating, the invention comprehensively adopts multi-level multi-segment space sealing and area isolation measures to inhibit dithering of the hot air in an effective transfer path of optical information, thereby obtaining a clear speckle image of surface deformation of the part before being heated in an aerobic environment with high temperature and the full field deformation of the heated surface.

The embodiment of the disclosure discloses a vehicle jitter control method and device, a drive control system and a vehicle, relates to the technical field of vehicle control, and mainly aims to improve the effect of suppressing vehicle jitter. According to the main technical scheme, the method comprises the steps: filtering out the disturbance variable of a torque command in a first frequency band to obtain feedforward compensation torque; extracting a rotating speed jitter amount in a second frequency band in the current rotating speed of the driving motor through a low-pass filter and a high-pass filter, the rotating speed jitter amount being in phase synchronization with the current rotating speed; determining a feedback compensation torque based on the rotation speed jitter amount; and correcting the feedforward compensation torque by utilizing the feedback compensation torque, and controlling the driving motor to output the corrected feedforward compensation torque.

An optical information-recording medium having in-groove pits, which is excellent in recording and reproduction characteristics and tracking characteristics, is provided. A method for producing the optical information-recording medium is also provided. Further, a stamper to be used for producing a substrate for the optical information-recording medium and a method for producing the same are also provided. In the optical information-recording medium of the present invention, the in-groove pits, which have flat bottom surfaces, are arranged on a groove which has a flat bottom surface. Therefore, it is possible to increase the difference between a height position of an interface between a recording layer and a reflective layer at a groove portion formed with the recording layer containing an organic dye and a height position of the interface between the recording layer and the reflective layer at an in-groove pit portion, as compared with an optical information-recording medium in which a wide-width portion and a narrow-width portion are formed on a groove. Accordingly, information, which is recorded on the in-groove pits, can be reproduced at a high modulation factor and at a low jitter.

The invention provides a vibration inhibition control method and system for an electric vehicle driving motor. The vibration inhibition control method comprises the steps that vehicle operation state information, actual torque information and power system part parameters are collected; load estimation is conducted according to the vehicle operation state information and the power system part parameters to obtain load estimation parameters; and original output torque is corrected according to the load estimation parameters and the actual torque information to obtain required torque to inhibit vibration of the driving motor. The vibration inhibition control method and system can effectively inhibit vibration of the electric vehicle driving motor and shake generated through interactive operation between driving and power generation during vehicle travelling.