31results about How to "Avoid accuracy" patented technology

The application provides a model training method and device and a cognitive dysfunction prediction method, belongs to the technical field of deep learning, and can construct a tear index vector through a patient tear sample and a cognitive impairment grade label; a multi-level graph neural network model is used for predicting a CDR index; the total loss of the model is calculated, the parameters of the multi-level graph neural network model are adjusted, a trained target cognitive dysfunction grade prediction model and a marker importance matrix are obtained; and finally, the cognitive dysfunction of a patient can be predicted through the target cognitive dysfunction grade prediction model, the problem of poor accuracy and stability caused by subjective judgment of doctors is avoided, and the accuracy of cognitive dysfunction grade prediction is improved.

The utility model relates to underground water sampling equipment technical field, concretely to an environmental detection underground water sampling equipment, including sampling pipe, the inner chamber sliding joint of sampling pipe has the limit stop, and the both sides swing joint of limit stop have grabbed and clamped, the below of grabbed and clamped is provided with first piston, the top of grabbed and clamped is provided with second piston, and the bottom of second piston is provided with limit slot, this environmental detection underground water sampling equipment, through sectional type pumping structure, carries out layered sampling to independent aquifer, and the cylinder drives grabbed and clamped to pull first piston to go up, and water sample passes through filter head and enters the below of sampling pipe, when the top of grabbed and clamped is pressed against the inside of limit slot, the bottom of grabbed and clamped loosens the clamping of connector, continues to drive second piston to go up, carries out sampling to another layered water sample through second sampling port, avoids the problem that water sample of different depth mixes together or sampling is not accurate.

The invention discloses a method for detecting emission of unknown volatile organic compounds in a respiratory gas passage in medical care application. In the invention, a method for systematically testing unknown volatile organic compounds (VVOC (very volatile organic compounds), VOC (volatile organic compounds) and SVOC (semi-volatile organic compounds)) by adopting a thermal desorption-gas chromatography-mass spectrometer (TD-GC-MS) is established. The method comprises the following steps: collecting 20L of gas by adopting a TENAX adsorption tube at a flow rate of 500mL / min, carrying out TD-GC-MS (Time Division-Gas Chromatography-Mass Spectrometer) analysis, carrying out qualitative analysis on unknown volatile organic compounds in combination with an NIST database and an artificial spectrum unfolding mode, and then carrying out quantification or semi-quantification on the volatile substances by adopting an external standard curve method. The method is suitable for qualitatively and quantitatively analyzing VOS released by a breathing gas channel according to the ISO 18562-3: 2024 standard, and the clinical use safety of medical instruments containing the breathing gas channel such as a breathing machine pipeline, an anesthesia loop and an oxygen mask connecting pipe is guaranteed.

This application discloses a rack impact simulation device and system, relating to the field of rack impact testing technology. The rack impact simulation device includes an impact force transmission mechanism and an impact force execution mechanism. The impact force transmission mechanism receives impact force along a first direction and converts it into an impact force along a horizontal direction. The impact force execution mechanism is connected to the impact force transmission mechanism and applies the horizontal impact force to the rack under test. The first direction and the horizontal direction form an angle. Through the coordinated design of the impact force transmission mechanism and the impact force execution mechanism, the conversion of the impact force direction can be achieved. Ultimately, the horizontal impact force is directly applied to the horizontally placed rack, avoiding the risk of rack center of gravity shift and tipping during testing caused by traditional inclined plane structures. Furthermore, the horizontal impact path eliminates the influence of the inclined plane angle on rack rebound, reducing the risk of secondary impacts interfering with the accuracy of experimental data.

The application relates to the technical field of mobile communication, and provides a data transmission method and device.The method comprises the following steps: associating the identification information of a peripheral device with peripheral information of the peripheral device and a callback method; determining a target peripheral device from a plurality of peripheral devices according to the received identification information, and at least one of the peripheral information callback method of the target peripheral device; and performing data transmission between the target peripheral device and an application program according to at least one of the peripheral information and the callback method of the target peripheral device.The data transmission method and device provided by the application can accurately determine the target peripheral device from a plurality of peripheral devices through the identification information of the peripheral device, and the peripheral information and the callback method of the target peripheral device, so that the accurate data transmission between the application program and the target peripheral device is realized, the accuracy of data transmission in the scene of connecting a plurality of peripheral devices is effectively solved, and a good intelligent experience is provided for users.

The application discloses a fiber type horizontal angle indicating device based on a self-collimation principle and a method thereof, and relates to the technical field of horizontal angle indication.The device comprises a light source, a fiber weight module, a light intensity receiving module and a frame.The light source emits a space light which is coupled into the fiber weight module.The fiber weight module converts the direction of the incident light into a vertical downward direction and emits the light to a measured object.The measured object reversely couples the incident light into the fiber weight module.The fiber weight module emits the incident light to the light intensity receiving module.The light intensity receiving module converts the incident light into an electric signal.The frame is used for suspending the fiber weight module.The application is suitable for the installation and debugging process of high-end manufacturing equipment, measuring instruments and scientific test equipment, and provides high-sensitivity horizontal angle indication for the adjustment requirement of the spatial posture of a sensitive element and the high-precision level of the ground.

The invention discloses a DDoS attack recognition detection method and system based on a self-training word segmentation device, and the method comprises the steps: obtaining a data packet embedding vector through the mapping of a packet encoder, and forming a network flow packet-level embedding sequence; enabling the network flow packet-level embedding sequence to pass through a flow aggregator to obtain a flow-level embedding vector; calculating a risk score of the network flow level embedded vector through a lightweight discrimination head; inputting the risk score into a trigger, and identifying a high-risk network flow; generating a fusion embedded representation of the high-risk network flow: constructing the flow part into a flow text sequence, encoding through a self-training word segmentation device to obtain an embedded representation, and fusing the embedded representation of the natural language part and the embedded representation of the flow part into a fusion embedded representation; and inputting the fusion embedded representation of the high-risk network flow into an attack identification model to predict whether a DDoS attack exists or not. The invention relates to the field of information security networks, can solve the problems of insufficient flow representation capability, poor adaptation to attack mode change, strong dependence on annotated data and the like in the prior art, and realizes accurate detection of DDoS attacks.

This application provides an electrode chamfering die, which includes a first chamfering upper mounting plate, a first chamfering pressure plate, a first chamfering punch, a first chamfering die, and a first chamfering lower mounting plate. The first chamfering pressure plate and the first chamfering punch are both mounted on the first chamfering upper mounting plate, and the first chamfering die is mounted on the first chamfering lower mounting plate. During operation, the first chamfering pressure plate first clamps and fixes the electrode to prevent displacement or deformation during processing. Subsequently, the first chamfering punch moves downward under the drive of a power device, cooperating with the first chamfering die mounted on the first chamfering lower mounting plate to round the sides of the electrode. Due to the tight fit between the first chamfering punch and the first chamfering die, and the fixing effect of the first chamfering pressure plate, the consistency and accuracy of the chamfering dimensions are ensured, effectively improving the precision and quality of electrode processing.

The utility model provides an artificial intelligence control device for the operation process of a water transportation port. The artificial intelligence control device has various advantages. The positioning holes provide accurate reference for device installation, and installation efficiency and quality are improved; the water transportation port is used for controlling the connecting port and the nickel-plated jack, so that stable and reliable connection, corrosion resistance and water resistance are guaranteed. The APM processor can be controlled to quickly process sensor data, real-time accurate control is achieved, and the operation automation level is improved. And the data storage stores related data, so that subsequent analysis and operation optimization are facilitated. And the wireless communication module is controlled to realize remote monitoring and control, so that the management cost is reduced. The device adopts a multiple waterproof sealing structure, prevents moisture and dust from invading, protects an internal circuit, and ensures stable data transmission. Through real-time monitoring and accurate control, operation parameters can be adjusted according to actual conditions, the safety, efficiency and resource utilization rate of port operation are improved, the cost is reduced, and the overall competitiveness is improved.

The utility model relates to quenching equipment technical field, concretely to a kind of high-speed steel processing's quick quenching equipment, including bottom plate, bottom plate top middle part is fixedly installed with mounting plate, mounting plate top is fixedly installed with heating ring, the bottom plate top is fixedly installed with installation box, installation box top is fixedly installed with water tank, the inside wall on the top of installation box is fixedly installed with spray plate by support block. The device heating ring is rapidly heated to high-speed steel, first pump machine rapidly transports the water in water tank to spray plate to high-speed steel is sprayed quenching, effectively improve production efficiency, conveying roller is installed on mounting bracket by telescopic link and return spring, and the position of conveying roller can be self-adapting adjustment by return spring, can be flexibly adjusted according to different models and specifications of high-speed steel, improve the applicability of device.

The application relates to a motion position and anti-pinch function test method and test tool for a vehicle-mounted mobile screen, the test tool comprising a tool base plate, an adjusting support fixedly connected to the tool base plate, a base assembly fixedly connected to the tool base plate, a position sensor assembly mounted on the adjusting support and a track tool plate, and an adjustable base assembly is used for fixing the vehicle-mounted mobile screen, wherein the sensor assembly comprises a start position sensor and an end position sensor which are respectively mounted on the adjusting support, the track tool plate has a first end corresponding to the position of the start position sensor, a second end corresponding to the position of the end position sensor, a track line between the first end and the second end, and an angle scale area and a percentage position scale area respectively located on both sides of the track line, and the degree line of the angle scale area intersects the degree line of the percentage position scale area at the track line; the motion position and anti-pinch function test method can realize the test of the global anti-pinch function of the vehicle-mounted mobile screen.

The utility model discloses a biochemical diagnosis reagent mixing device relates to diagnosis reagent production technical field, the inside of shell body is equipped with mixing chamber, the lower part of shell body is equipped with the outlet of the mixing chamber, is equipped with the stirring shaft in mixing chamber, the middle section of stirring shaft is equipped with first fixed seat, the circumference of first fixed seat is equipped with a plurality of stirring vane, and is equipped with the fixed link between two adjacent stirring vane, one end of fixed link is connected with first fixed seat, and the other end of fixed link is connected with the conical fairing. Improved the homogeneity and efficiency of overall mixing.

The utility model relates to the field of draw-bar box, disclose a shock absorbing gyro wheel and utilize the draw-bar box of gyro wheel. The shock absorbing gyro wheel, including several mounting frames, several mounting frames are arranged on several gyro body respectively, the top of several mounting frames all is equipped with L shaped board, the inside of several L shaped boards all are connected with the shaft through bearing, the top surface of several movable plates all are fixed with first spring, the threaded end of several screw rods all are connected with nut threadedly. In the utility model, through the cooperation of mounting frame, gyro body, L shaped board, shaft, mounting frame, movable plate, fixed plate, movable cylinder, screw rod, first spring and nut, the problem that the gyro body of traditional draw-bar box is poor in shock resistance can be solved, the stable and reliable shock absorbing effect is provided, the first spring design of adjustable can adapt to the requirement of shock absorbing effect under different weight, different road conditions, improve the applicability and practicality of the shock absorbing gyro wheel.

This invention relates to the field of building engineering technology, specifically disclosing a measuring device for building engineering, comprising: a support connecting frame and a protective box, wherein the protective box is fixedly connected to one side of the support connecting frame. This invention has at least the following beneficial effects: Through the provided telescopic mechanism, the grip length can be flexibly adjusted according to the user's height, measurement habits, etc., thereby reducing fatigue during prolonged operation and adapting to operational needs under different working conditions, improving the device's versatility and ease of operation; Addressing the problems of slippage, trajectory deviation, and counting distortion caused by changes in the push rod angle during uphill and downhill measurement using existing distance measuring wheels, an angle measurement and adjustment mechanism is provided. This mechanism can detect the bending angle of the telescopic mechanism in real time and adaptively adjust the measurement standard, ensuring stable grounding of the moving wheel and accurate rolling trajectory during uphill and downhill measurement, effectively avoiding problems such as underestimation of measurement results and poor repeatability, and improving the accuracy of uphill and downhill measurement.

This utility model discloses a purging water device for hot-rolled lower stepped pads, belonging to the field of hot-rolled purging technology. The hot-rolled lower stepped pad has a left-side protective cover and a right-side protective cover on both sides. The purging water device includes: a left-side rigid pipe installed on the right edge of the left-side protective cover, with M left-side nozzles mounted on the left-side rigid pipe; a right-side rigid pipe installed on the left edge of the right-side protective cover, with N right-side nozzles mounted on the right-side rigid pipe; and a controller for controlling the working state of the left and right-side nozzles. The left-side rigid pipe is connected to a cooling water pipe via a left-side flexible hose; the right-side nozzles are connected to a cooling water pipe via a right-side flexible hose; M and N are both natural numbers greater than 0. This utility model uses nozzles to purge the stepped pad, allowing iron oxide powder on the stepped pad to be blown away in a timely manner, resulting in more precise adjustment of the stepped pad's elevation.

The application provides a measurement result correction method and system for an engineering surveying device, relates to the technical field of data processing, acquires N first distance measurement results and GPS satellite positioning information, constructs a meteorological simulation channel to analyze N communication time difference calibration values, performs error fitting to acquire N second distance measurement results and determine first positioning information, screens adjacent base stations to perform satellite positioning and deviation analysis, and performs error fitting on the first positioning information. The application solves the technical problem of low stability and accuracy in the prior art of engineering surveying error correction, which only performs positioning fitting of a mobile station through positioning information of a known position base station without considering environmental deviation of an actual scene, causes transmission time delay due to meteorological parameters, performs one-time measurement calibration, performs secondary calibration based on positioning deviation of a known adjacent base station to avoid complexity of a meteorological environment and stability and accuracy deviation existing in a measurement process, and improves accuracy of measurement results.

The utility model discloses a data recorder, wherein: man -machine interaction module includes by the front shell and the rear shell front -back assembly together's interactive casing, installs the touch screen at the front side of the front shell outside, installs man -machine interaction circuit board in the interactive casing and with touch screen electricity connection, the rear side of rear shell outside is equipped with the power supply interface and communication interface and at least two for installing function module's insert slot of man -machine interaction circuit board, function module includes by the upper shell and the lower shell upper -lower assembly together's function casing, installs function circuit board in the function casing, and the power supply interface and communication interface of function circuit board are equipped with in the front end of function casing, when function circuit board's power supply interface and communication interface are respectively inserted on man -machine interaction circuit board when function casing guiding cooperation is inserted into the insert slot in place, the external structure and size of each function module and insert slot are consistent and can interchange. The instrument avoids the heat interference function circuit board, has configurable and the ability of development, and the assembly and maintenance are convenient.

The application discloses a heavy-load combined train cooperative communication consistency braking control method and device. In the train braking process, the braking controller combines the strict constraints of the actuator and the relative displacement between the carriages, and adopts a distributed model predictive control method to design a cooperative braking controller according to the state variables such as the speed, acceleration and position information of each sub-node; the train consistency braking force control method is designed to solve the performance index of minimizing the speed inconsistency and the relative displacement difference between the carriages. The application reduces the relative displacement and the speed inconsistency between the carriages during train braking, reduces the size of the train hook force during braking, effectively reduces the damage of the carriage structure, and improves the comfort during train driving.

This application relates to a magnetic resonance imaging method, a medical imaging scanning control method, and a medical imaging system. The method includes: acquiring a three-dimensional vascular image of an imaging object; the three-dimensional vascular image includes at least one of bright blood vessel images and dark blood vessel images; acquiring medical record information of the imaging object and / or other modalities of medical images of the imaging object; determining the location of a region of interest (ROI) in the three-dimensional vascular image based on the medical record information and / or other modalities of medical images, as well as the three-dimensional vascular image and a localization model; and scanning the imaging object based on the ROI location to determine a two-dimensional vascular image of the imaging object. Using the magnetic resonance imaging method provided in this application can improve the accuracy, consistency, and efficiency of locating the ROI, thereby improving the accuracy and efficiency of the determined two-dimensional vascular image of the imaging object.

The invention discloses a comprehensive estimation and fault diagnosis integration method based on a battery health state. The method comprises the following steps: simplifying a complex working condition into two main working conditions of battery charging and battery driving through data preprocessing and working condition reconstruction; respectively constructing a capacity attenuation model of the battery under the charging working condition and an internal resistance growth model under the driving working condition; estimating the SOH (state of health) of the battery under the charging condition and performing fault diagnosis; performing SOH estimation and fault diagnosis on the battery under the discharging or driving working condition; carrying out comprehensive evaluation on the SOH of the battery by using adaptive Kalman filtering AT-KF; a battery health (SOH) estimation output and a failure alert output are integrated. The method has the advantages that through multi-index fusion, limitation of a single health index is avoided, and comprehensiveness and accuracy of SOH estimation of the battery are guaranteed. A noise covariance self-adaptive adjustment mechanism of temperature change has high precision and robustness; and through integrated modeling, the safety and practicability of the system are improved.

The utility model provides a floating platform underwater chain arm saw cutting device which comprises a floating platform, a sliding rail mechanism is arranged on one side of the floating platform, a driving device is arranged on the sliding rail mechanism, the driving device is connected with the sliding rail mechanism, a movable platform is arranged on the top of the sliding rail mechanism, a lifting device is arranged on the movable platform, and a chain arm saw is arranged on the top of the lifting device. The general cutting position of the chain arm saw is controlled by controlling the position of the floating platform, meanwhile, the phenomenon that a worker dives underwater to operate the chain arm saw for operation is avoided, the danger that divers may face decompression sickness, drowning and the like is avoided, and the chain arm saw enables the overall cutting efficiency to be high and the use cost to be low. A motor of the driving device is driven to enable the belt to move, so that the sliding block of the sliding rail mechanism slides relative to the rail, the movable platform slides relative to the floating platform, the cutting point of the chain arm saw in the horizontal direction is adjusted, and the advancing path of the chain arm saw is controlled.

The application discloses a preferred method, device, electronic equipment and storage medium for constructing traps. The method comprises the following steps: determining a plurality of target structural traps of each target stratum corresponding to a target region based on a depth domain construction map of the target region; determining a first velocity corresponding to the target structural trap based on a blind well velocity field constructed by a well calibration average velocity and a root mean square velocity spectrum of a target well and a target stratum of the target structural trap, and determining a second velocity corresponding to the target structural trap based on an optimal velocity field and the target stratum of the target structural trap; predicting a burial depth error of the target structural trap based on the first velocity and the second velocity, determining a comparison result of the target structural trap based on the burial depth error of the target structural trap and a preset threshold, and determining a drilling sequence of the plurality of target structural traps based on the comparison result of each target structural trap. The embodiment solves the problem that the depth error of the structural trap affects the accuracy of the preferred structural trap, and avoids the influence of the velocity field construction error on exploration.

The application provides a UAV cruise forest fire detection method based on binary cooperative feedback, which comprises two parts of a binary detection network and a cooperative feedback mechanism based on a smoke-fire relationship. In the binary detection network, the FCOS network is improved, and a regression range adaptive training determination method based on the FPN layer is proposed. The regression range of each layer of the FPN is adaptively adjusted according to the semantic characteristics of the target, so that each type of target can learn gradient reversal in the appropriate FPN layer during the training stage. In the cooperative feedback mechanism, the correlation characteristics between smoke and fire are fully utilized as knowledge priori to continuously optimize and strengthen the proposed binary cooperative network, so that the continuous and accurate detection and tracking of the fire situation can be realized in the scene of rapid change of smoke and flame. In the forest fire inspection scene, the technical scheme of the application can realize accurate identification and positioning of the fire position, and greatly reduces the input of manpower and material resources in forest fire management.

The application discloses a method for measuring catalyst pore defects, which comprises the following steps: mixing molten paraffin with a catalyst, stirring and ultrasonic dispersing simultaneously; rapidly cooling the mixture of the paraffin and the catalyst by using liquid nitrogen; analyzing the three-dimensional structure of the catalyst by using X-ray computed tomography; processing the three-dimensional scanning original data by using data processing software, and the program is sequentially median filtering, threshold segmentation, boundary particle removal, filling the catalyst image holes by using a morphological hole filling algorithm, particle marking and screening, taking an image difference set, and statistically calculating data, and finally obtaining the catalyst pore rate. Compared with the traditional measurement method, the method can more accurately observe the catalyst structure from the three-dimensional angle, and provides data for the manufacture and evaluation of the catalyst.

The utility model relates to the field of machining, and discloses a double-edge adjustable boring cutter which comprises a cutter handle, a mounting structure and an adjusting structure, the adjusting structure is mounted on the cutter handle through the mounting structure, and the adjusting structure comprises a mounting groove, a second sliding groove, a bidirectional lead screw, a handle, a sliding block, a sliding plate, a top plate, a clamping block, cutting edges and a bolt. The mounting groove and the second sliding groove are formed in the mounting base, the bidirectional lead screw is rotationally mounted in the mounting groove, the handle is fixedly mounted at one end of the outer side of the bidirectional lead screw, the top plate is mounted on the bidirectional lead screw through the sliding block and the sliding plate, the clamping block is fixedly mounted at the top end of the top plate, and the cutting edge is mounted on the clamping block through the clamping groove. A threaded hole is formed in the side wall of the end of the cutting edge, the clamping block and the cutting edge are connected through the bolt, in the arranged adjusting structure, the cutting edge can be finely adjusted according to different machining requirements, the position of the cutting edge can be rapidly adjusted, and different machining requirements are met.

The invention discloses an MES micro-service dynamic collaboration system based on a message queue, and the system comprises a production end module which is used for generating an MES production message containing a service type and service context information; the message middleware module is configured with at least one key message queue and at least one non-key message queue, and is used for classifying the MES production messages into key task messages and non-key task messages according to a preset priority rule, and respectively routing the key task messages and the non-key task messages to the key message queue and the non-key message queue; the service governance layer module is used for monitoring and acquiring the load state of the data collection service module in real time; the data collection service module is used for dynamically pulling and processing corresponding messages from the key message queue and the non-key message queue according to the load state to generate structured data; and the rule engine service module is used for executing rule operation on the structured data and generating fact data, real-time instructions or early warning information. According to the invention, the real-time performance, reliability and stability of the MES system can be improved.

This utility model discloses an automatic feeding screw device for plastic processing, relating to the field of plastic processing technology. It addresses the problems of clogging and material jamming in feeding devices, and the difficulty in accurately controlling the feeding amount, resulting in poor accuracy and uniformity of feeding. The device includes a conveying cylinder, a feeding screw coaxially rotatably mounted inside the conveying cylinder, a hopper mounted on the conveying cylinder, and a discharge pipe mounted on the conveying cylinder, with a discharge adjustment component installed on the discharge pipe. This utility model uses a variable frequency motor to drive the feeding screw to rotate. The feeding screw drives a transmission rod to rotate via a transmission wheel set, causing the transmission rod to drive a stirring rod to rotate within the hopper, agitating the raw material and preventing jamming and clogging. An electric actuator drives a gear ring to rotate, which in turn drives a rack and pinion to move baffles. The spacing between the four baffles is adjusted to control the amount of raw material passing through.

The utility model relates to the technical field of industrial plates, and provides an industrial plate visual inspection device which comprises a device body, a processing table is arranged at the top of the device body, a connecting piece is fixedly installed at the bottom of the processing table, and the connecting piece is slidably connected into the device body. An electric telescopic rod is fixedly installed on the left side of the connecting piece, the other end of the electric telescopic rod is fixedly installed on the left side of the bottom of the device body, sliding rods are fixedly installed on the two sides of the bottom of the device body, and the connecting piece is connected to the outer surfaces of the two sliding rods in a sliding mode. Through the arrangement of the forward rotation lead screw and the rack structure, the industrial plate can be clamped and positioned, the accurate positioning can ensure that the industrial plate is kept fixed in the subsequent processing or detection process, and misoperation or inaccurate detection caused by dislocation is avoided.

The application discloses a kind of calculation methods of temporal displacement of underlying shield tunnel upheaval when foundation pit excavation causes, comprising the following steps: (1) the related size of foundation pit and underlying shield tunnel and relative position relationship are clear, establish coordinate system, construct calculation analysis model;(2) considering the characteristics of soil consolidation deformation in tunnel-soil interaction process, equivalent to elastic half-space foundation model, equivalent to Euler-Bernoulli beam of shield tunnel is placed in elastic half-space inside, combined with Terzaghi-Rendulic three-dimensional consolidation theory, using the deformation coupling condition of tunnel and soil, the temporal solution of underlying shield tunnel upheaval displacement caused by foundation pit excavation is obtained.The application does not need to determine the ground reaction coefficient or soil shear layer parameters, avoids the problem that these parameters are complex and difficult to obtain accurately in two-stage method;Fully consider the characteristics of soil consolidation deformation, can more reasonably and accurately predict the upheaval displacement size of underlying shield tunnel caused by foundation pit excavation and its development process with time.

The application relates to a charging control method and device, equipment and a storage medium, and relates to the technical field of automobiles. The method comprises the following steps: when a vehicle battery is connected to a charging pile, it is determined that the step-down output voltage of an energy conversion device is reduced to a first charging voltage within a preset time length; the energy conversion device is controlled to be in a step-up mode, and the step-up output voltage is adjusted to be a first output voltage and the step-up output current is adjusted to be a first charging current; when the output current of the charging pile is determined, the output voltage of the charging pile is raised to a second output voltage, and when it is determined that the maximum rated voltage of the charging pile is less than a preset voltage, the vehicle battery is charged by the charging pile. Therefore, the vehicle battery can be charged in a step-up mode or a direct current mode based on the maximum rated voltage of the charging pile and the preset voltage, and the technical problems that the charging time is prolonged and the charging circuit needs to be switched multiple times when the maximum output capacity of the charging pile is directly used as a charging mode switching condition for charging mode switching are solved.