378results about How to "Guaranteed response speed" patented technology

The invention discloses a method for controlling the signal priority of an emergency vehicle at an intersection based on a two-stage optimization process, which relates to a method for controlling the signal priority of an emergency vehicle at a road intersection, solves the problems that the emergency vehicle cannot be provided with absolute priority to pass by a condition priority control method in the prior art and is used for traffic control. The method comprises the following steps of: when the emergency vehicle requests the priority to pass the intersection, detecting the existence of the emergency vehicle and transmitting information to an intelligent signal controller subsystem; computing the time during which the emergency vehicle reaches the intersection from a detection position and the dissipation time of queuing vehicles in the entrance direction of the emergency vehicle according to the received emergency vehicle information and the information of the queuing vehicles onall driveways in different entrance directions so as to acquire the green time in other entrance directions; and providing the signal priority for the emergency vehicle according to the signal state at the current intersection so as to advance or delay the green time and reduce the delay time of other vehicles simultaneously.

An automatic tensioning device for belt conveyor is suitable for long-range covneyor or a rubber belt conveyer, of which belt has a large extension rate. It achieves a large regulative range, an accurate control of tension force, and stable adjustment. The system consists of a tension monitor, a hydraulic device and a hydraulic hoist. The tension monitor comprises a detecting cylinder, a pressure sensor, a shutoff valve and a pressure meter. The hydraulic device comprises a pump, a reversing solenoid valve, a overflow valve, a manual valve, a hydraulic one-way valve, a proportional reversing valve, a one-way throttle valve, a one-way valve, a throttle valve, a tank, and oil-way. The outlet of the pump is respectively connected with the tension monitor, the cylinder and the driving circuit of the hydraulic hoist via the one-way valve.

The invention provides a big data access method used for accessing file resources in a cloud storage platform. The big data access method comprises the following steps: combining files of which the sizes are smaller than preset sizes in a distributed file system to form a new storage file; establishing a primary index and a secondary index for the combined file; buffering the indexes before a user requests by utilizing a pre-access mechanism. According to the big data access method, the response speed of a cloud storage platform and the overall performance of the distributed file system are kept under the condition that a great number of small files are read and written.

The invention discloses a fully digital electric variable pitch driver. Peripheral devices of the driver comprise a shaft tank, a variable pitch actuating motor, and an incremental coder on the output shaft of the motor; circuits of the driver comprise two parts, namely a drive circuit and a control circuit; the drive circuit comprises a rectifying circuit, an inverter circuit, a switch power supply circuit, a current and voltage detecting circuit and a relay drive circuit; and the control circuit comprises a DSP module, a CPLD module, a PWM signal drive circuit, a signal conditioning circuit, a switching value acquiring circuit, a coder signal conditioning and acquiring circuit and a communication circuit. The fully digital electric variable pitch driver directly receives a command which is sent by a fan master control and performs three-closed-loop control based on vector change and SVPWM by detecting the current signal of a motor stator and the signal of the coder so as to realize the variable pitch control of the actuating motor; and the control accuracy, the response speed and the reliability of a variable pitch system can be ensured, and then the generating efficiency and the power quality of a whole wind generating set are increased.

The invention provides an online order distribution and delivery method based on a scoring mechanism and path planning. The method comprises the following steps: firstly, orders in a certain time range of the same region are merged through a clustering algorithm; then, the historical distribution information of the rider is obtained by mining the historical distribution data of the rider in the order platform, and whether the rider matches the sub-orders in the order set is calculated; then the scores of the riders are calculated in the set of matched riders; the distribution information is preferentially pushed to the matched first rider with the highest score, and if the rider gives up, the distribution information is pushed to the matched second rider with the second highest score, andforwarded three times in the same way, and if no one takes orders, the distribution information is distributed to the snatching pool for the matched rider to snatch orders; finally, the route distribution scheme of the received single rider is determined by the cultural genetic algorithm. According to the order distribution and distribution method of the invention, the order distribution balance can be maintained while the customer experience is guaranteed, the distribution cost is further reduced, and the distribution efficiency is improved.

The invention relates to an electrified railway in-phase power supply device and a multi-target coordinated instantaneous current control method adopted by the device. After the in-phase power supply device is used, the electrified railway whole-line in-phase power supply can be realized, the output power of two power supply arms of a traction transformer can be balanced, and the negative sequence problem can be thoroughly solved; the load reactive power and the harmonic current can be compensated, and the electric energy quality of a traction power supply system can be comprehensively improved; the voltage of a traction electric network can be stabilized, the transient state stability of the voltage can be improved, the power supply distance of the power supply arms can be increased, and the amount of power substations can be reduced; the electrified railway in-phase power supply device and the multi-target coordinated instantaneous current control method are multiple in targets, the multi-target can be simultaneously controlled, the control harmony at two sides can be guaranteed, the dynamic response capability is stronger; a rectification side inverter takes the active power transfer and the stable direct voltage as a control target, and participates the reactive power control; and an inversion side inverter performs active power, reactive power and harmonic wave control, and participates the stable control of the direct voltage.

The invention relates to a system and a method for realizing energy consumption control through controlling virtual machine migration in a cloud computation server cluster system, which are used for monitoring use information of virtual machines on various master servers in the sever cluster system. The method comprises the steps of: under a condition when a virtual machine on a master server is monitored to meet a virtual machine migration condition, migrating the virtual machine on the master server to other master servers; and then computing a total electricity consumption of the various master servers, and carrying out feedback control on the migration of a virtual machine load again according to the electricity consumption. According to the system and the method, by monitoring the electricity consumption of the master servers, the load migration process of the virtual machines is subjected to feedback control according to the electricity consumption, so that the loads of the various master servers are balanced after load migration, and a CPU (central processing unit) cannot be placed in an overloading working state, so that the response speed of the CPU to the user virtual machine can be guaranteed, and the energy consumption of the CPU can also be guaranteed.

A method and apparatus for checking and synchronizing data blocks in a distributed file system are provided. The distributed file system includes a metadata server, data block servers and a storage medium; the metadata server specifies one of the data block servers in the same group as a master data block server, while takes the others as slave data block servers. The method includes: the metadata server initiating a data block checking request to the master data block server; the master data block server checking all the data block information managed by the slave data block servers in the group, synchronizing according to the checking result, and then reporting the checking and synchronization results to the metadata server; the metadata server updates the metadata information according to the reported checking and synchronization results. Therefore, the metadata server only takes very little time to fulfill the checking and synchronizing the database.

The invention discloses a permanent magnetic synchronous motor system, a field weakening control method thereof, and a field weakening control device thereof. The field weakening control method comprises steps that a first output voltage ud/uq under the rotating coordinate system of the permanent magnetic synchronous motor system or a second output voltage u alpha/u beta under the static coordinate system of the permanent magnet synchronous motor system, and an expected output voltage us is acquired according to the first output voltage u d/ u q or the second output voltage u alpha/u beta; a voltage amplitude limiting threshold value is acquired according to the output voltage us, and field weakening current is generated according to the amplitude of the expected output voltage us and the voltage amplitude limiting threshold value; the field weakening current is superposed with the direct axis current closed loop of the permanent magnetic synchronous motor system to carry out the field weakening control over the permanent magnetic synchronous motor system, and in addition, a field weakening control bandwidth is smaller than the bandwidth of the direct axis current closed loop, and is greater than double of frequency of an alternating current power supply input in the permanent magnetic synchronous motor system. The responding speed of the field weakening control is guaranteed, and by fully using a fluctuating direct current busbar voltage, maximum motor efficiency operation is achieved during the fluctuation of the direct current busbar voltage.

The invention discloses a short-circuit protection circuit for driving tubes and an inductor in a switch-type charge management chip, which mainly solves the problem of incorrect detection of an existing short-circuit protection circuit. The short-circuit protection circuit comprises two high-voltage NMOS (N-channel Metal Oxide Semiconductor) tubes, a lower tube detection unit (1), an upper tube detection unit (2) and a logic drive unit (3), wherein the lower tube detection unit (1) is used for carrying out short-circuit detection on a lower driving tube when an upper driving tube is switched on and outputting a lower tube short-circuit signal to the logic drive unit (3); the upper tube detection unit (2) is used for carrying out the short-circuit detection on the upper driving tube and the inductor when the lower driving tube is switched on and outputting an upper tube short-circuit signal to the logic drive unit (3); the logic driving unit (3) controls the upper driving tube and the lower driving tube to be switched off when short circuit happens and controls the high-voltage NMOS tubes to switch off a charge power supply if a short-circuit phenomenon continues. According to the short-circuit protection circuit disclosed by the invention, a short-circuit detection circuit is mutually independent of an over-current detection circuit, the detection accuracy and the circuit reliability are increased, and the short-circuit protection circuit can be used for the switch-type charge management chip in large charge current.

The invention relates to the technical field of automobile braking, in particular to an electronic parking system, a vehicle comprising the same and a control method. The invention aims to solve the problem that an existing electronic parking system is low in safety. In order to achieve the purpose, the electronic parking system comprises a primary parking controller and a secondary parking controller, wherein the primary parking controller is at least connected to a first wheel brake for receiving a braking command and controlling the first wheel brake to act based on the braking command; andthe secondary parking controller is at least connected to a second wheel brake for receiving the braking command and controlling the second wheel brake to act based on the braking command and a stateinformation of the primary parking controller. By arranging two electronic controllers redundantly, the electronic parking system can improve the safety performance of the vehicle.

The invention relates to a system and a method for controlling a full digital door machine. A control device is connected with a power supply and a motor; a speed reduction mechanism is fixed with the motor, a gear and a rotating shaft; a belt is connected with the gear; a door body is connected with a connecting piece and a sliding rail; and the connecting piece is connected with the belt. The method comprises: the low speed and acceleration of the door body and the total running distance of the door body are used to calculate a second speed reduction point; the high speed, low speed and acceleration of the door body, the running distance of the low-speed motion stage and the total running distance of the door body are used to calculate a first speed reduction point; the position of closing the door is reset to zero; a photoelectric encoder determines the running position of the door body; the door body actually runs to the speed instruction value of the speed reduction point and begins to decelerate; and distance deviation between the instruction value and the actual speed value in the acceleration process is obtained. The system and the method solve the problem of overlarge deviation between the expected speed and the actual speed in the acceleration process of the running of the door body and reduce hardware cost. Current and speed double closed loop control ensures control precision and response precision. A double-redundancy mode of the current detection of an obstacle and the position current of the obstacle ensures the running safety of the door body.

The invention discloses a method for controlling air-fuel ratio of instantaneous condition of an electric controlled gasoline engine; the method comprises the following steps of: controlling of synchronous and asynchronous enriching of transient working condition of the electric controlled gasoline engine, intake pressure prediction method and closed loop controlling of transient working condition; the transient working condition comprises the following steps of: controlling the step of synchronous and asynchronous enriching, intake pressure prediction step, and closed loop controlling step of transient working condition; the common characteristic of the three methods is that precise control of air-fuel ratio is realized in the control process of the whole transient working condition; according to different working conditions, the enriching mode is selected automatically, thus guaranteeing control precision of the response speed of the acceleration process and the air-fuel ratio of the acceleration process furthest; in the instantaneous transient working condition, an oxygen sensor signal is used fully so as to modify the error of enrichment or desaturation furthest, thus improving economy and emission of engines.

A method of extracting high-purified solanesol from potato leaves, tobacco leaves and/or tobacco stems is that the solanesol is extracted from the raw materials by extracting solvent, solanesol extract is obtained after solid-liquid separation; the solanesol extract is processed for the phase-transfer catalytic saponification reaction inside an organic-solvent-buck-phase-transfer catalyst system; the solanesol extract after saponification is completely dissolved in mixed alcohol-acetone solvent under 50 DEG C to 75 DEG C for stationary placing, cooling and filtering; filtrate is steamed to be dry to obtain the solanesol extract after wax removal, and the solanesol extract is dissolved in methanol or acetonitrile in reflux to be frozen and crystallized for obtaining white solid which is dried to obtain the solanesol. The present invention has the advantages of gentle reaction condition, simple technology, short production period, large batch, the high yield and purity of the solanesol and being convenient for industrialization.

An embodiment of the invention provides a data processing method and device. Each client information table in a database is converted into metadata files carrying table structure information and client data files carrying client information in the table periodically, and total client attribute data are loaded to a distributed cache system actively by loading the metadata files and the client data files to the distributed cache system. By means of the method and the device, mass client attribute data are cached through the distributed cache system, so that the response speed, the throughput and the stability of client attribute data providing can be effectively guaranteed.

The invention provides a super-weather resistant alkali-activated-fly ash-slag bicomponent outer wall inorganic coating. In the coating, sodium water glass and water are selected as base materials, and pulverized fuel ash, high-aluminum cement, slag, titanium white powder, pigment, talcum powder, redispersable latex powder, hydroxyethylcellulose, a naphthalene-based water reducing agent and a powdery antifoaming agent are used as padding. By testing the washing resistance of the coating of the invention, a specimen is washed 25,000 times without bubbling or cracking or dropping; by testing the water resistance, the specimen is soaked for 4,320 hours without bubbling or cracking or dropping; by testing acid rain resistance, the specimen is soaked in a solution, of which the pH is equal to 3 and is adjusted every day to be maintained to be 3, for 960 hours without bubbling or cracking or dropping; by testing salt resistance and alkali resistance, the specimen is soaked in 0.2mol/L of KOH solution of 5 percent of NaCl for 960 hours without bubbling or cracking or dropping; by testing bonding strength, the specimen has the bonding strength of 1.14MPa; and by testing flexibility, the specimen is qualified by 100 percent by being inspected through a grid scoring method of 1mm.

The invention provides a reaction die for a polymer optical fiber prefabricated bar, which includes a non-rigid polymerization container with closed lower end, a removable top cover and a tense polytetrafluoroethylene rope or metal wire, wherein the top cover is provided with a hole which makes an inner cavity of the polymerization container communicated with outside, circumference of the top cover is closely combined with the polymerization container, the polytetrafluoroethylene rope or metal wire is arranged at axle center of the polymerization container and penetrates overall length of the polymerization container. The reaction die has simple structure, and is suitable for industrial popularization. The invention also provides a method for preparing the polymer optical fiber prefabricated bar by using the reaction die. The method has simple operation, and is easy for industrial use, the prefabricated bar prepared by the method has flattening surface, less bubble, obvious fiber core cladding boundary and controllable diameter, is easy to be drawn to form fiber and realize doping to prepare various functional optical fiber prefabricated bar.

The invention discloses a preparation method of a large on-off ratio field effect transistor. The preparation method is characterized by comprising the following steps: (1) preparing graphene sheets and a tungsten disulfide sheet according to a mechanical exfoliation method, selecting a monocrystalline silicon wafer with an oxidation layer to serve as a substrate, and transferring one graphene sheet, the tungsten disulfide sheet and the other graphene sheet on the substrate sequentially to form a graphene heterojunction; and (2) uniformly coating photoresist in a spinning manner on the graphene heterojunction, transferring patterns on a mask onto the photoresist via exposure, and depositing Ti/Au metal via electron beam vapor deposition to obtain Ti/Au electrodes, so as to obtain the tunneling field effect transistor based on the graphene heterojunction. As the high carrier mobility of graphene and band gaps of transition metal dichalcogenides are taken into consideration, and the heterojunction of graphene and tungsten disulfide is taken as a channel material, the prepared field effect transistor is high in response speed and large in on-off ratio.

The invention discloses an air-ground coordination-based expressway emergency disposal simulation system and an assistant decision making method. The system comprises an unmanned aerial vehicle group,an unmanned aerial vehicle foundation assembly and an industrial computer. As a vehicle-mounted device for emergency command, the device can quickly reach a nearby location after an expressway emergency event, and has high flexibility and mobility; the advantages of flexible unmanned application means, abundant application scenarios and wide data acquisition are made full use of, the system and the method can be timely used for on-site information collection when the expressway emergency event happens, and the response speed of emergency disposal is ensured; an emergency disposal strategy simulation mode is applied, the implementation process of the strategy is previewed in advance, the implementation effects are evaluated to assist a field commander to make a better decision, the purposeof improving the decision making precision is achieved, and risks brought by a poor emergency disposal strategy are reduced at the same time.