165 results about "Speed function" patented technology

Systems, methods, and a computer readable medium for performing auto exposure (AE) techniques that are beneficial in variable lighting conditions—and particularly applicable to handheld and / or mobile videoconferencing applications—are disclosed herein. Handheld and / or mobile videoconferencing applications—unlike their fixed camera counterparts—are often exposed to a wide variety of rapidly changing lighting and scene conditions, and thus face a difficult trade-off between adjusting exposure parameter values too frequently or not frequently enough. In personal electronic devices executing such handheld and / or mobile videoconferencing applications, it may be desirable to: use a small, centered, and center-weighted exposure metering region; set a relatively low brightness target value; and adjust the camera's exposure parameter values according to a distance-dependent convergence speed function. The use of such techniques, in conjunction with a relatively large stability region, may also improve the quality of a video encoder's temporal predictions—and thus video quality—in videoconferencing applications.

A method for segmentation of an organ of a living subject with a variable shape and boundary and surrounded by structures and tissues in connection with an image containing the organ. In one embodiment, the method includes the steps of initializing a contour inside the organ in the image, introducing a speed function that is capable of accumulating spatial and temporal information of a propagating front of the contour, and evolving the contour toward the boundary of the organ using the introduced speed function so as to segment the organ.

A method for segmentation of 2D structures in CT and MR images is provided. The method is based on 2D ray propagation by mean-shift analysis with a smoothness constraint. Ray propagation is used to guide an evolving curve due to its computational efficiency and shape priors are incorporated for robust convergence. The method includes the steps of receiving 2D image data; visualizing the 2D image data on a display device; selecting a structure in the 2D image data by placing a seed in the structure; initializing a plurality of rays from the seed to form a curve; determining a speed function of each of the rays; evolving the curve by propagating the rays based on the speed function of each of the rays; converging the rays on a boundary of the structure; and segmenting the structure when all of the rays have converged on the structure's boundary.

The invention relates to a remote data collection system for wearable equipment and a control method thereof. The remote data collection system comprises the wearable equipment, an intelligent terminal and a cloud server. The wearable equipment comprises a displaying module, a sensor module, a GPS locating module, a wireless transmission module, a power supply module and a microprocessor. The displaying module, the sensor module, the GPS locating module, the power supply module and the wireless transmissions module are connected with the microprocessor. The wireless transmission module comprises an NFC chip and an MCU processor which are connected in parallel. The MCU processor is connected with the microprocessor. The intelligent terminal is an intelligent mobile phone or an IPAD with a built-in NFC chip. The intelligent mobile phone or the IPAD is provided with a 4G communication module and a wireless communication module. The cloud server comprises a cloud computer and a network communication module. Compared with the prior art, the wireless function, the low power loss function and the high transmission speed function can be achieved, and the real-time performance of data transmission is achieved.

The invention relates to the field of air-conditioning operational control and specifically relates to an air-conditioning control method. The air-conditioning control method comprises the steps of S1, detecting the outer tube temperature T-outer tube of an outdoor unit, an outdoor environment temperature T-outdoor environment and the exhaust temperature T-exhaust of a compressor in real time and obtaining the real-time operational rotating speed of the outdoor unit according to the operational rotating speed function of the outdoor fan; S2, detecting an indoor environment temperature T-indoor in real time, and taking the indoor environment temperature T-indoor and the door environment temperature T-outdoor environment into a compressor operational frequency function to obtain the real-time operational frequency of the compressor; and S3, detecting an inner tube temperature T-inner tube of an indoor unit and n suction temperature T-suction of the compressor, and taking the inner tube temperature T-inner tube, the suction temperature T-suction of the compressor, the outdoor environment temperature T-outdoor environment and the exhaust temperature T-exhaust of the compressor into an expansion valve openness degree function to obtain the openness degree of the expansion valve. According the air-conditioning control method, the system response time of the whole unit is short, the air-conditioning unit can enter a steady operation stage rapidly, precise control can be achieved, and the number of early matching experiments is small.

The invention relates to a motion control method of a double-wheel differential type robot, which is technically characterized in that a body coordinate system xoy is established in the world coordinate system XOY by taking the geometric center of a robot as the origin of coordinates; and motion control method for the double-wheel differential type robot is based on kinematics, aims at the most fundamental and most important two motions among all the motions of the wheeled robot, i.e. the in-situ rotating motion and the moving-to-fixed-point motion of the wheeled robot, and realizes the control of the two motions. All the complicated motions of the double-wheel differential type robot can be composed of the two fundamental motions. By reasonably improving the linear speed function in the control method based on the error ratio and simultaneously combining the chord tangent method, the invention realizes the integrated control on the moving-to-fixed-point motion of the robot. The integrated control greatly gives play to the respective advantages of the two methods, and avoids the effects of the respective defects on the robot motion. The invention also provides a resolution strategy corresponding to the cyclic oscillation phenomenon.

The invention discloses a double arm coordination acceleration control method based on an impedance model under the rigidity condition. The method comprises the following steps that firstly, a robot controller collects information of a six-dimensional force sensor, filtering treatment is conducted on the collected information, then gravity compensation is conducted, and finally expected force deviation value data or expected torque value deviation value data are obtained; secondly, the force deviation value data or the torque value deviation value data are converted into the moving acceleration and the pivoting angular acceleration of a robot tail end in the Cartesian space; thirdly, a corresponding position function, a corresponding speed function, a corresponding acceleration function and a corresponding jerk function are obtained; fourthly, a joint angle function in the joint space is obtained according to the inverse kinematics; and fifthly, after isochronic synchronous interpolation of the joint space is conducted on the joint angle function, the joint angle function is sent to a servo driver through a bus of the controller, and then the action of a robot is controlled. By means of the double arm coordination acceleration control method, the real-time force tracking effect can be achieved, and the movement of the robot is smooth during following.

The invention relates to a trajectory planning method for attitude maneuver. The method includes the steps that first, a characteristic main axis and an Euler angle are determined; second, trajectory planning is performed on the Euler angle so that a planning angular speed function and a planning angle function in the direction of the characteristic main axis can be obtained; third, a planning quaternion function and a planning target angular speed function in the process of the attitude maneuver process are calculated; fourth, the planning quaternion function and the planning target angular speed function are output to an external control system. The method is applicable to a single-axis or double-axis or three-axis maneuver condition, a maneuver trajectory with the shortest path can be obtained, multiple axes can be in place in a maneuver mode at the same time, and the fast maneuver requirement is met.

The present invention is level set system for implementing interactive editing operators for surfaces. Level set models are deformable implicit surfaces where the deformation of the surface (editing operation) is controlled by a speed function in the level set partial differential equation. The level set system overcomes the self-interaction problems associated with mesh models. One embodiment takes scan converts input models such as polygon mesh, NURBS, CSGS models into level set models. An interface is provided by which models can be edited with editing operators such as blending, smoothing, embossing, etc. One embodiment utilizes several methods to optimize computations related to the editing operators. For example, shortest distance calculations, bounding boxes, numerical integration, and the sparse-field methods are disclosed for the implementation of the level set deformation operator embodiments including blending, smoothing sharpening, and embossing. The resulting level sets model can be volume rendered or extracted to a polygon mesh.

The invention relates to a method for programming a spiral curve track through die cavity numerical control machining .The boundary of a die cavity is embedded into a level set function of a high one-dimensional space; a zero level set of the level set function is the boundary of the die cavity; and the level set function is initialized to a sign distance function. Bias of the boundary of the die cavity is obtained through the solution of a level set equation; and a speed function of the level set equation is corrected so that a high-curvature region can be smooth in generating a bias line. The distance between the bias lines is controlled through the control of time for boosting the boundary; in the process of boosting the boundary of the die cavity, the complex topological change is naturally treated; and the spiral curve track is programmed in different regions respectively. The method is suitable for programming a cutter track of a numerical control machining system with a common die cavity and a complex die cavity; the cutter track is continuous and smooth; and for the complex die cavity with island, the method can realize automatic division in regions and carry out spiral curve track programming in different regions.

The invention provides an air conditioner control system based on dynamic heat comfort. The air conditioner control system based on dynamic heat comfort comprises an intelligent air speed regulation module, a intelligent temperature regulation module, a manual regulation module and a memory module. The air conditioner control system based on dynamic heat comfort is characterized in that the intelligent air speed regulation module comprises an instantaneous air speed function of a PMV of a target area in a [-0.5,+0.5] interval according to dynamic changes of the air speed, the intelligent temperature regulation module comprises an instantaneous temperature function of the PMV of the target area in the [-0.5,+0.5] interval, and the instantaneous air speed function and the instantaneous temperature function of the target area are in linkage control; the intelligent air speed regulation module is used for controlling and regulating the air supplying speed according to the set air speed function of the target area; the intelligent temperature regulation module is used for controlling and regulating the air supplying temperature according to the set temperature function of the target area; the manual regulation module is used for regulating and controlling the indoor temperature; the memory module serves as a device for memorizing the last-time using state of an air conditioner.

The invention relates to a high-speed function automatic switching system. The high-speed function automatic switching system enables a host vehicle to enter and exit ramps of highways automatically and change lanes. The system comprises a vehicle positioning module, a signal processing module, and a switch prompt module, wherein the vehicle positioning module is configured to position the host vehicle, calculate a longitudinal road distance between the host vehicle and entrance and exist of a ramp of the highway, and acquire information of a lane in which the host vehicle is and lane information of a target lane, the information processing module is configured to determine whether the host vehicle arrives at or is at a prompt area of the entrance and exit of the ramp of the highway according to information determined by the vehicle positioning module and speed of the host vehicle, distance information and speed information of the host vehicle and surrounding vehicles, and the switch prompt module is configured to give out a switch prompt signal when determining that the host vehicle arrives at or is at the prompt area of the entrance and exit of the ramp of the highway.

The invention provides a method for combining a near-surface velocity model with a middle-deep stratum velocity model, and belongs to the field of seismic exploration data processing. The method comprises the following steps: (1) the near-surface velocity model, an observation system, a velocity analysis reference surface and speed functions or seismic data obtained through velocity analysis are input; (2) a preferable velocity analysis reference surface of a CMP (common midpoint) is calculated according to the near-surface velocity model and the observation system; (3) velocity analysis is conducted relative to the preferable velocity analysis reference surface obtained in the steps (2) to obtain a velocity function representing the middle-deep stratum velocity model, or a speed function obtained through velocity analysis relative to a non-preferable velocity analysis reference surface is corrected according to the difference of the velocity analysis reference surface and the preferable velocity speed analysis reference surface to obtain the velocity function representing the middle-deep stratum velocity model; (4) the near-surface velocity model is combined with the middle-deep stratum velocity model.

A car following modeling method considering optimal speed memory and a rear-view effect includes the following steps: a. building a car microscopic following traffic flow model through a mathematical expression; b. simplifying the car following model; c. selecting an optimal speed function; d. according to the following model, obtaining linear stable conditions of the model, and drawing a boundary between a stable region and an unstable region of the model; e. setting a traffic scene that needs to be simulated by changing a pace car motion state; f. obtaining the initial states of all vehicles; and g. performing analogue simulation of the motion state of a following motorcade when t is larger than 0, assuming that a specific pace car changes the motion state according to a preset situation, the following motorcade running according to the following model considering optimal speed memory and the rear-view effect, investigating the motion states of all the vehicles when t is larger than 0, and obtaining a speed distribution map of the cars of the model in a selected traffic scene after updates are carried out according to a rule. The car following modeling method considering the optimal speed memory and rear-view effect can improve stability of traffic flow, and relieve traffic congestion.

The present invention relates to the segmentation of two-dimensional gel electrophoresis images (2D images). The method according to the invention associates an initial protein seed candidate with an interface circumscribing said seed and thereafter brings said interface to evolve in accordance with a defined speed function F(x, y). The evolution of the interface is halted by a stopping criterion, C. According to the invention, the speed function can depend on a wide variety of parameters such as the pixel intensity, the curvature of the pixel intensity, the distance to the initial seed, the curvature and / or shape and / or normal direction and / or position of the evolving interface. The stopping criterion depends e.g. on the speed function F and / or the time of arrival T(x, y) and / or the departure time Td for said interface. The invention provides criteria for a specific treatment of saturated spots and to mike sure that interfaces never overlap.

A hydraulic transmission mechanism (57) and a transmission gear (74) for transmitting the driving force of the engine (2) are provided, and the respective outputs of the hydraulic transmission mechanism (57) and the transmission gear (74) are synthesized to form a transmission output. (74), to obtain the output of high power transmission efficiency, use the above-mentioned hydraulic transmission mechanism (57), obtain the output of the stepless speed change that can advance zero position, with simple speed change operation, carry out speed adjustment according to the situation, seek the speed change function To improve and improve operability, etc., at the same time, through each output of forward rotation or reverse rotation of the hydraulic transmission mechanism (57), the composite output shaft (84) is rotated in one direction, and the composite output shaft (84) composite hydraulic transmission mechanism (57) and transmission gear (74) each output, carry out variable speed output, ensure the output torque when zero position advances easily, improve microspeed driving performance easily, and effectively utilize the high power of transmission gear (74) at working speed The output of transmission efficiency seeks to improve the working ability on dirt roads, etc.

A cruise control arrangement for a vehicle includes a cruise control speed function, a cruise control brake function and at least one selectable economy level, having a set maximum speed value corresponding to a maximum allowed vehicle speed, a set brake speed value corresponding to a brake cruise speed and a set cruise speed value corresponding to a cruise speed, where a temporary brake speed value replaces the set brake speed value as the actually used brake speed value, and where the temporary brake speed value is dependent on the selected economy level. The behaviour of the cruise control of a vehicle can be adapted to take account of economy, which makes it possible to optimize the fuel consumption of the vehicle.

The invention discloses a multifunctional high-precision constant-temperature and constant-humidity control freezing and refrigerating system. The system is formed by a refrigerating system, a refrigeration house body, an air supply and return system and a control system. By means of the refrigerating system, adjustment of the evaporating temperature ranging from -40 DEG C to 0 DEG C can be achieved, and the refrigerating system is composed of a scroll compressor, a gas-liquid separator, an ice temperature evaporator, a thermostatic expansion valve, an electromagnetic valve, a quick-freezing evaporator, an electronic expansion valve, an interstage cooler, a liquid storage device, a hot gas bypass valve, a dry filter, a liquid viewing lens, an air-cooled condenser and an oil separator; and the air supply and return system is arranged in the refrigeration house body, and comprises a quick-freezing air supply and return system, an ice temperature supply and return system and a hot gas circulation defrosting system. According to the system, corresponding food processing can be carried out according to different requirements, the refrigeration house using rate is greatly improved, and economic benefits are considerable; and intelligent volume variable adjustment of the refrigerating system can also be achieved, and therefore the constant-temperature, constant-humidity and constant-air-speed function meeting the different food processing requirements is achieved.

The invention relates to the technical field of automobile steering, in particular to an electric power steering system and method. The electric power steering system comprises a wheel assembly, a steering mechanism mechanically connected with the wheel assembly, a steering controller, an ignition lock and an angle sensor, wherein the ignition lock and the angle sensor are electrically connected with the steering controller, the steering controller is electrically connected with the steering mechanism, and the angle sensor is mounted in the steering mechanism and used for collecting the current steering angle value of a steering wheel; the steering controller can obtain the current steering angle value of the steering wheel and the gear of the ignition lock in real time; and when the gear of the ignition lock is switched to the OFF gear from the ON gear and the current steering angle value of the steering wheel is larger than a set angle value, the steering controller controls the steering mechanism to rotate according to a steering angular speed function till the steering angle value of the steering wheel is smaller than the set angle value. By means of the electric power steering system and method, wheels automatically return after an automobile is stopped and parked, and thus the service life of the automobile is prolonged.

The invention discloses a power system of an all-wheel-drive hybrid power automobile and a control method. The power system comprises an engine, a first motor, a first inverter, a front-axle planet gear reducer, a second motor, a second inverter, a rear-axle reducer and a battery; the power system only comprises two motors and a set of simple planet gear mechanism and is relatively lower in cost, under the pure electric mode, the free selection of front-drive, rear-drive and all-wheel-drive can be achieved, the first motor further has two selectable gears, the opportunity of working at optimum efficiency is improved, and the pure electric economy is improved. Under the engine mode, starting and low-speed driving of the automobile can be achieved through the electronic stepless variable speed function, and the economy of low-speed driving of the automobile is improved. The engine has three selectable fixed gears which are used for direct driving in medium-high speed cruising, high-efficiency characteristics of the engine in high-load are used, the damage of electrical paths due to the electronic stepless variable speed is avoided, and the transmission efficiency is improved.

The present invention relates to a system and method for dual-microphone noise reduction applied to vehicle speech recognition. The system comprises a main microphone, an auxiliary microphone, a speed mute module and a speed recognition subsequent processing module. The main microphone is configured to record passengers' sound and travelling noise; the auxiliary microphone is configured to record driving nose; the speed mute module is configured to process speech / noise signals recorded by the main microphone and the auxiliary microphone and optimize the speech / noise signals recorded by the auxiliary microphone through a noise model base to obtain noise signals, the processed main microphone speech / noise signals subtract the noise signals to obtain speed signals, the speed signals and a speed model base are subjected to matching optimization to obtain pure speed signals; and the speed recognition subsequent processing module is configured to identify sent speed signals and execute corresponding operation. The noise model base and the speed model base are arranged to match and optimize speed signals to obtain pure speed so as to improve the speech recognition rate in a vehicle and ensure the complete execution of a speed function.

The invention discloses an electric vehicle power system with a hollow rotor motor and double-gear speed reduction with differential speed. The electric vehicle power system comprises a hollow rotor brushless direct current motor; a sun wheel hollow rotor of the hollow rotor brushless direct current motor is used as a sun wheel of a first-grade planetary speed reduction gear train and is used for carrying out power input; double-gear speed change is realized through a second-grade planetary speed reduction gear train; the sun wheel hollow rotor is provided with a through central hole, so that an axle shaft conveniently penetrates through the through central hole to carry out power transmission; the combination and separation of two groups of the planetary speed reduction gear trains are realized through driving a gear-shifting shift fork by a gear-shifting motor, so that the conversion of high and low speed ratios is realized; a differential speed function of output is realized through a bevel gear differential mechanism. According to the electric vehicle power system with a hollow rotor motor and double-gear speed reduction with differential speed, disclosed by the invention, high-frequency output of the motor is realized through double-gear speed reduction under different working conditions of the motor; meanwhile, the structure of the motor is optimized, the transmission efficiency is high, the structure is compact, the weight is light and the power system is convenient to mount and arrange.

The invention provides a non-programming electronic cam curve generating method for transection. The method comprises: differential processing is carried out based on fifth-power non-dimensionalized position relation function to obtain a speed function, an acceleration function, an accelerated acceleration function; according to different cutting lengths, equation coefficients are calculated by selecting different conditions; conversion between a non-dimensionalized value and a true value is carried out on the functions; and then coordinate offset processing is carried out to obtain piecewise functions. According to the invention, an electronic cam curve can be generated only by setting three parameters: a parameter knife perimeter, a total synchronzi9ation length, and a cutting length; and generation of a reverse speed of a driven shaft is avoided based on calculation. For the electronic cam curve generated by using the method in the transection field, the operation and debugging of the filed operator can be simplified; programming is avoided; and the reliability is high. The speed curve is a fourth-power function that is more flexible and smoother by compared with a third-power function.

The invention belongs to the field of resonance diffusion imaging, in particular to a fast-marching fiber tracking method based on topology preservation, comprising the steps of: reading DTI (Diffusion Tensor Imaging) data; manually selecting a seed point and initializing; evoluting from the seed point to peripheral neighbor points by using a fast-marching method and adopting a curvature weighting speed function, recording topology information in an evolution process, i.e. a source node of each evoluting point; calculating all paths by adopting a time gradient descent method; and selecting a real fiber path by a link matrix. The invention has the advantages of more according with the real fiber path by fiber tracking and reducing urious positive branches; and the obtained fiber is smooth and better reflects the fiber direction.

The invention discloses a speed control method for a high-accuracy traction teaching robot based on an impedance model. The speed control method includes the steps: S1 acquiring information of a six-dimensional force sensor by the robot: firstly, performing filter processing for acquired information, secondly, performing gravity compensation, and finally, acquiring deviation data of expected force or an expected torque value; S2, transforming the deviation data of the force or the deviation data of the torque value into moving speed of the tail end of the robot in the Cartesian space and angle speed rotating around an axis according to the impedance model; S3 performing smooth interpolation for motion according to a deformed S-shaped speed control curve to obtain a corresponding position function, a speed function and an acceleration function; S4 calculating a joint angle function in joint space according to inverse kinematics; S5 performing isochronous interpolation of the joint space for the joint angle function, and transmitting the joint angle function to a servo driver by a bus of a controller to control actions of the robot. According to the speed control method, traction accuracy is effectively improved.

Methods and apparatuses are presented for determining coefficients for a polynomial-based approximation of a function, by iteratively estimating a first coefficient, reducing the first coefficient to a lower precision to obtain a first limited-precision coefficient, analytically calculating a second coefficient by taking into account the first limited-precision coefficient, reducing the second coefficient to a lower precision to obtain a second limited-precision coefficient, iteratively estimating a third coefficient by taking into account at least one of the first limited-precision coefficient and the second limited-precision coefficient, and reducing the third coefficient to a lower precision to obtain a third limited-precision coefficient. In one embodiment of the invention, the polynomial-based approximation relates to a minimax approximation of the function approximated, and at least one of the steps for iteratively estimating the first coefficient and iteratively estimating the third coefficient involves use of a Remez exchange algorithm.

The invention discloses a modeling method considering the influence of sub-adjacent vehicles to traffic flow time lag car-following model stability. The modeling method includes that a microscopic traffic flow model DOVM (as shown in the description) including reaction time lag is established; the influence of sub-adjacent vehicles to traffic flow is considered, and an optimal speed function V(Deltax<n>, Deltax<n>+1)=(1-p) U (Deltax<n>) + pU (Deltax<n>+1) is selected, the optimal speed function is obtained through measured data fitting, wherein 0<=p<1 / 2, and an influencing factor representing the sub-adjacent vehicles refers to U(Deltax<n>)=16.8[tanh0.0860(Deltax<n>-25)+0.913]; a new traffic flow model GDOVM is established and stability analysis is carried out, the optimal speed function is put into the microscopic traffic flow model DOVM including reaction time lag and the new traffic flow model GDOVM is obtained, and according to the critical stability conditions, the influence of the reaction time lag and the sub-adjacent vehicle influencing factors to the system stability area can be obtained.