1399 results about "Oil temperature" patented technology

The invention belongs to the technical field of transformer operation loss monitoring, and particularly relates to a transformer operation loss condition optimization monitoring method, which comprises the following steps of: calculating an anomaly degree based on oil temperature and vibration characteristics, generating a real-time working condition in combination with load intensity, and associating accumulated operation duration to analyze a real-time operation loss anomaly index; the method comprises the following steps: realizing dynamic correlation between loss and the actual state of equipment, analyzing and extracting fluctuation parameters through a load characteristic change curve, calculating a comprehensive load fluctuation degree, correcting an operation loss abnormal index to eliminate load fluctuation interference, finally determining a dynamic reference threshold according to a historical loss curve, judging continuous overrun through double rules, and triggering early warning. Meanwhile, guide factors such as overload and internal heating abnormity are accurately recognized, corresponding adjustment instructions are output, loss monitoring accuracy and scene adaptability are improved, operation and maintenance closed loop of early warning, guide factors and disposal is achieved, and the method is suitable for transformer full-life-cycle loss monitoring.

The invention provides a power transformer electromagnetic loss control method and device in an intelligent power grid environment, and relates to the field of intelligent power grids, and the method comprises the steps: carrying out the cooling demand prediction of a transformer according to a predicted power load sequence and a space temperature sequence, and outputting a predicted cooling load sequence; and with meeting of the predicted cooling load sequence as a constraint and minimization of energy consumption and oil temperature fluctuation as optimization targets, cooling parameters of the forced oil cooling device are optimized, an optimal cooling parameter sequence is output, and the forced oil cooling device is controlled to dissipate heat of the transformer. The method aims to solve the technical problems that a traditional control method lacks cooling strategy dynamic adjustment capacity, temperature rise abnormity is prone to occurring in a high-load or high-temperature environment, transformer iron core loss and winding loss are remarkably increased, and electromagnetic loss is high, accurate and efficient cooling control can be achieved, the electromagnetic loss is effectively reduced, and the service life of a transformer is prolonged. And the operation efficiency and stability of the transformer are improved.

The invention relates to the technical field of transformer iron core current suppression, and particularly discloses a transformer iron core current closed-loop suppression method and system based on digital twin drive, and the method comprises the following steps: collecting multi-dimensional sensing data of iron core current, oil temperature, environment temperature and vibration acceleration in real time, preprocessing the data, and storing the data according to a time sequence; and constructing and dynamically calibrating a transformer iron core digital twinborn model so as to reflect the coupling dynamic response of the iron core current, the switching resistance, the temperature and the vibration. According to the transformer iron core current closed-loop suppression method based on digital twinborn driving provided by the embodiment of the invention, a digital twinborn model reflecting an electromagnetic-thermal-mechanical multi-physics field coupling effect is constructed and dynamically calibrated by fusing multi-dimensional sensing data such as iron core current, oil temperature, environment temperature, vibration acceleration and the like; and in combination with self-adaptive dynamic safety threshold generation, model prediction control and a closed-loop feedback updating mechanism, the limitation that a traditional method depends on fixed parameters and lacks dynamic adjustment capability is effectively broken through.

The invention relates to the technical field of electrical equipment insulation performance detection, in particular to an insulating oil dielectric loss test system based on temperature compensation, which comprises a temperature acquisition module for acquiring insulating oil temperature data and environment temperature data; the dielectric loss measurement module measures a dielectric loss value and a dielectric loss angle through a self-adaptive anti-interference algorithm, and synchronously records voltage and frequency; the intelligent compensation module matches temperature characteristic parameters for different temperature intervals, and compensates a dielectric loss detection value through a segmented temperature compensation model; the state analysis module judges the aging degree and state of the insulating oil according to the compensated dielectric loss value and acid value, generates a multi-stage early warning signal and a diagnosis report by combining the breakdown voltage and the moisture content, and dynamically adjusts the test frequency according to the oil sample type and the operating age limit; and the cloud management platform stores historical data and compensation parameters, establishes a performance degradation model, analyzes a dielectric loss trend and generates maintenance suggestions. Therefore, the problems of insufficient test precision, poor environmental adaptability and the like in the prior art are solved.

The invention relates to an oil-proof emulsification control method and system for an air compressor of an urban rail vehicle, and solves the problem of lubricating oil emulsification caused by insufficient working efficiency of the air compressor and environment humidity change by constructing a comprehensive control system comprising the compressor, an oil-proof emulsification device and a controller. The system monitors lubricating oil temperature and environment humidity in real time through a temperature sensor and a humidity sensor; the working rate of the air compressor is accurately calculated, wherein the vehicle operation time t2 takes the operation speed larger than 10 km / h as the calculation starting point; the controller comprehensively judges whether the oil-proof emulsification device is started or not based on temperature, humidity and working rate data, and the control strategy comprises the step of dynamically adjusting the working rate judgment node according to the real-time temperature and humidity. According to the method, accurate and reliable control over the oil-proof emulsification process is achieved, emulsification of the lubricating oil is effectively prevented, and energy consumption and maintenance cost can be reduced.

The utility model relates to an oil way system, a cascade unit, energy-saving equipment and refrigeration equipment, the oil way system comprises a first heat exchanger, a first oil tank and a second oil tank, a first channel and a second channel are arranged in the first heat exchanger, and heat exchange can be conducted between the first channel and the second channel; two ends of the first oil tank are respectively communicated with the first channel to form a first circulating oil path; the two ends of the second oil tank communicate with the second channel to form a second circulating oil way. According to the oil way system, when the oil temperature in the first oil tank and the oil temperature in the second oil tank have a large temperature difference, the oil temperature of one oil tank is too low, and the oil temperature of the other oil tank is too high or too high, heat exchange between the two circulating oil ways can be achieved through the first heat exchanger; and therefore, the conditions of too low oil temperature and too high oil temperature are relieved synchronously, and normal operation of an oil way can be guaranteed. No extra heating assembly or oil cooling assembly is needed, and the power consumption and the manufacturing cost of the oil way system can be obviously reduced.

The invention discloses a wind-water combined heat dissipation method and device for a hydraulic station, and relates to the technical field of hydraulic heat dissipation control. The wind-water combined heat dissipation method comprises the steps that an expected die-casting plan of a target die-casting machine is read; an expected working load is determined, temperature rise trend prediction of oil liquid of the multiple hydraulic components is carried out, and multiple predicted oil temperatures are output; performing cooling demand analysis, and determining a plurality of initial cooling temperature values; carrying out lubrication performance attenuation analysis, compensating the plurality of initial cooling temperature values, and outputting a plurality of cooling temperatures; a wind-water combined heat dissipation twin model is constructed, heat dissipation parameter simulation optimization is carried out, and an optimized heat dissipation control strategy is output; and according to the optimized heat dissipation control strategy, heat dissipation control in the cooling backflow period is conducted on the target hydraulic station. The technical problems that in the prior art, heat dissipation accuracy and practicability are insufficient, and the working quality and working efficiency of the hydraulic station are affected are solved, and the technical effects that the heat dissipation accuracy and practicability of the hydraulic station are improved, and the working efficiency and working quality of the hydraulic station are improved are achieved.

The invention discloses an axle staged cooling system, an axle staged cooling assembly and an engineering vehicle. The axle staged cooling system comprises an engine first-stage cooling system, an engine second-stage cooling system, an axle first-stage cooling system and an axle second-stage cooling system. Each stage of cooling system controls cooling water and oil path trend through a thermolator in each loop, controls axle cooling oil and engine cooling water to exchange heat, and meets different cooling requirements of an axle. The temperature sensor in each loop outputs water and oil temperature signals to a motor of the cooling fan, so that the rotating speed of the fan is increased to different degrees along with the temperature rise of each cooling system, and different cooling powers are matched. According to the grading system, the engine and the axles can work at the proper temperature at the same time, the two heat exchangers cool cooling oil of the front axle, cooling oil of the middle axle and cooling oil of the rear axle respectively, the cooling capacity of the front axle is improved, the braking effectiveness of the front axle is guaranteed, and rollover caused by serious backward movement of the gravity center of a vehicle during emergency braking is prevented.

The invention relates to the technical field of transformers, and discloses a noise reduction type finned radiator for a transformer, which comprises a transformer body, and the transformer body comprises a transformer box, an oil outlet pipe, an oil inlet pipe and a radiator; a variable section unit is arranged on the oil outlet pipe and used for making memory metal contract or stretch to drive a movable shaft to move when the environment temperature or the oil temperature changes according to the characteristic that the memory metal is sensitive to the temperature, and a section adjusting block moves in an adjusting cavity through a first connecting rod and an adjusting column. And the section of an internal flow channel of the oil outlet pipe is adjusted. Through the variable section unit, the internal flow channel section of the oil outlet pipe can be automatically adjusted according to the environment temperature by means of the characteristic that memory metal is sensitive to the temperature. And in a low-temperature environment, the memory metal shrinks to drive related parts to move the section adjusting block and reduce the section of the flow channel, so that the flow velocity of the transformer oil is accelerated, and the problem of excessive heat dissipation or insufficient heat dissipation is avoided.

The invention discloses a method and a system for detecting the health state of a transformer in real time, relates to the technical field of transformer detection, is used for solving the problem of fault early warning lag, and aims at solving the problem of fault early warning lag by monitoring the output voltage of the primary side and the secondary side of the transformer, calculating the fluctuation ratio, analyzing the stable operation state and counting the abnormal duration. After entering a temperature rise analysis mode based on duration judgment, detecting oil temperature and winding temperature, calculating a difference value, calling a cooling system start-stop instruction to obtain a cooling response value, calculating a response lag rate, collecting data of gas dissolved in oil, calculating a gas anomaly ratio, and analyzing thermoelectric synergy anomaly characteristics in combination with the response lag rate; the method comprises the following steps: acquiring an insulation aging grade and an oil product replacement period from a historical maintenance database, evaluating an insulation degradation coefficient according to the insulation aging grade and the oil product replacement period, analyzing a health state in combination with thermoelectric collaborative abnormal characteristics, selecting an operation optimization or shutdown maintenance mechanism, improving fault early warning capability, optimizing a maintenance strategy, and prolonging the service life of equipment.

The embodiment of the invention discloses a transformer winding overheating fault diagnosis method, and relates to the technical field of power equipment state monitoring, and the method comprises the steps: building a temperature field model of a target transformer under a normal working condition and a plurality of preset winding overheating fault working conditions through a finite element simulation method, and obtaining a temperature field model of the target transformer based on a simulation result; calculating to obtain a group of fault temperature rise critical values corresponding to the positions of the winding sections; when the transformer runs on line, actual measurement temperature rise data of a plurality of positions on the surface of a box body of the transformer are obtained, and the actual measurement temperature rise data are compared with a fault temperature rise critical value so as to locate a winding section where an overheating fault occurs; for the fault section, solving an actual overheating temperature rise value of the fault section through an inversion calculation method by utilizing a preset transformer equivalent thermal circuit model and combining the actually measured top layer oil temperature and bottom layer oil temperature data; high-precision simulation is arranged offline, an efficient algorithm is used online, the diagnosis precision and efficiency are both considered, the accuracy is high, and the practicability is high.

The invention discloses a transformer temperature rise evaluation method and system based on a Stacking integrated learning framework, and the method comprises the steps: constructing a sample data set based on input variables including the size of an oil baffle plate, the width of an oil duct, the number of oil baffle plates and boundary temperature and response variables including the temperature rise of winding wire oil and the temperature rise of a hot spot through employing a Latin hypercube sampling principle and CFD simulation; constructing a Stacking integrated temperature rise model fusing the multi-model information in a layered manner, independently training a first layer by using the sample data set to generate a plurality of prediction results, and training a second layer after splicing the prediction results to obtain the Stacking integrated temperature rise model fusing the multi-model information; and after hyper-parameter joint optimization is carried out to determine hyper-parameters, a machine learning library is called to automatically complete training of the Stacking integrated temperature rise model fused with multi-model information, a trained temperature rise prediction model is obtained, temperature rise prediction is carried out on a to-be-predicted transformer configured by a new oil baffle plate and an oil duct structure, and predicted values of output line oil temperature rise and hot spot temperature rise values are obtained.

The invention relates to the technical field of air conditioners, in particular to an air conditioner control method and device, an air conditioner and a storage medium. According to the method, the communication state of the throttling element, the balance electromagnetic valve and the four-way valve in the air conditioner is adjusted by judging the operation mode before the air conditioner is shut down and the operation parameters before the compressor is shut down in combination with the outdoor environment temperature, so that the refrigerant pressure and the refrigerant flow direction in the refrigerant pipeline are controlled; the compressor is prevented from being pressed to rotate reversely due to the fact that the pressure difference value between the exhaust port and the air suction port of the compressor is too large, and the technical problem that in the prior art, an air conditioner stops under the condition that the pressure difference is large or the oil temperature is insufficient, and consequently the compressor rotates reversely is solved.

The utility model relates to the technical field of roller presses, and discloses a roller press roller gap control device which comprises a first roller and a second roller which are oppositely arranged, and a roller gap is formed between the first roller and the second roller. The execution module is in driving connection with the first roller, and the first control module is connected with the execution module to control the execution module to drive the first roller to move to a first set position so as to preliminarily adjust a roller gap; and the second control module is connected with the execution module to control the execution module to drive the first roller to move to a second set position so as to adjust the roller gap for the second time. According to the utility model, the first control module and the second control module are adopted to realize secondary movement control on the first roller respectively, so that direct measurement on the roller gap is realized without being influenced by a bearing gap, deformation and the oil temperature of an oil cylinder, the thickness of a pole piece and the set position deviation of the roller gap are effectively reduced, and the measurement precision is improved. And the pole piece thickness and the roll gap position linearity are improved.

The invention belongs to the technical field of adjusting systems of grease storage tanks, and particularly relates to an automatic temperature and humidity adjusting method and system for a biological grease storage tank, and the method comprises the steps: obtaining the operation data and the current oil temperature of storage tank conveying equipment, and constructing a rheological resistance index; an integral mechanism with time as the axis is established, the accumulated thermal stress of the grease in the whole life cycle is calculated according to the current oil temperature and the preset sampling period, and the accumulated thermal stress is used for representing the sum of thermal damage borne by the grease in the storage period; calculating a target temperature at the current moment based on the rheological resistance index and the accumulated thermal stress; and the environment relative humidity and the environment temperature are collected, environment coupling correction is carried out on the target temperature according to the environment relative humidity and the environment temperature, and closed-loop control is carried out on the storage tank by taking the corrected temperature as a final set value. According to the invention, the heating strategy can be adaptively adjusted according to the rheological resistance and accumulated thermal stress of grease, and active defense can be realized in a high-humidity environment.

The utility model relates to the technical field of oil cooling motor structures capable of rapidly reducing oil temperature, and discloses an oil cooling motor structure capable of rapidly reducing oil temperature, which comprises a bottom plate and a motor main body, a rapid oil temperature reducing assembly is arranged at the top of the bottom plate, and the rapid oil temperature reducing assembly comprises an oil pump, a circulating pump, a fan frame and radiating fins. The oil pump is connected with an oil tank through an input pipe, the oil pump is connected with a cooling oil disc through an output pipe, and through the arrangement of the rapid oil temperature reducing assembly, a worker starts the oil pump, pumps cooling oil from the oil tank and injects the cooling oil into the cooling oil disc, the cooling oil disc is attached to the outer wall of the motor body, operation heat is absorbed, the motor is prevented from being overheated, and stable operation is guaranteed; the circulating pump pumps out hot oil from the cooling oil tray and feeds the hot oil into the heat dissipation pipe, the heat dissipation fins on the heat dissipation pipe increase the heat dissipation area and cooperate with the fan in the fan frame to accelerate heat dissipation, the cooled oil returns to the oil tank through the return pipe, efficient circulation of the cooling oil is achieved, and the motor is continuously cooled.

A lubricating oil pipeline forming a U-shaped channel and a refrigerant containing cavity surrounding the pipeline are arranged in a box body, a refrigerant inlet is formed in the bottom of the refrigerant containing cavity, and a refrigerant outlet is formed in the top of the refrigerant containing cavity. A refrigerant inlet and an oil inlet section of the U-shaped channel are arranged on the same side, and a refrigerant outlet and an oil outlet section of the U-shaped channel are arranged on the same side, so that a heat exchange mode that refrigerants and lubricating oil flow reversely in a high-temperature area and flow downstream in a low-temperature area is formed; heat exchange fins are arranged on the outer wall of the U-shaped channel in the circumferential direction. A porous ceramic area used for adsorbing bubbles can be arranged on the inner side wall of the box body. Through countercurrent flow heat exchange of the U-shaped pipeline, the heat exchange efficiency is improved, the temperature of lubricating oil can be stably controlled to be smaller than or equal to 40 DEG C, the problem of lubrication failure caused by too high oil temperature of the disc separator is solved, and therefore the reliability of the disc separator under long-term high-load operation and the service life of a bearing are guaranteed.

The invention discloses a supercritical CO2 vulcanizing machine hydraulic station heat dissipation and heat recovery system, which relates to the technical field of hydraulic systems, and comprises a hydraulic oil tank unit and a gasification coil pipe arranged in a hydraulic oil tank, the temperature sensor is used for monitoring the hydraulic oil temperature in real time; the flow regulating valve is connected with the gasification coil pipe; wherein the temperature control system comprises a PLC (Programmable Logic Controller) and an upper computer, and the PLC is used for receiving data acquired by the temperature sensor, transmitting the acquired data to the upper computer through a modbus protocol for data processing and executing heat dissipation control; the dynamic temperature prediction module and the supercritical CO2 generation unit are connected through a pipeline, and the supercritical CO2 generation unit and the hydraulic oil tank unit are connected through a pipeline; and the heat energy recovery and utilization unit comprises a high-pressure coil pipe and a heat storage medium used for absorbing and storing heat transferred by the high-pressure coil pipe, centralized monitoring and management of equipment are conveniently achieved, and meanwhile the heat energy centralized recovery efficiency and scale benefits are improved.

The invention discloses a method for achieving starting and dynamic power output of a range extending system. The method comprises the following steps that 1, a BMS feeds back an electromagnetic SOC to a VCU in real time; 2) judging by the VCU; (3) a shutdown instruction is sent to the ECU; 4) the ECU controls the engine to stop and sends a stop instruction to the GCU; (5) the GCU controls the generator to stop; (6) a starting instruction is sent to the ECU; (7) the ECU sends a starting instruction to the GCU; (8) the GCU drags the engine at a constant speed; (9) the ECU judges whether an ignition instruction is sent or not according to the rotating speed, the oil temperature and the water temperature; (10) the GCU stops dragging; (11) the ECU controls the engine to enter an idle speed; and (12) the ECU sends a preparation completion instruction to the VCU, the situation that energy consumption is increased due to the fact that a traditional range extending system repeatedly switches on and off and frequently adjusts rotating speed gears in the battery charging process is optimized, when the working condition is stable, the battery is kept at a proper capacity, the stability of the battery is improved, and the service life of the battery is prolonged.

The invention provides a water-oil combined heat dissipation power module. On the basis of an existing water-cooling power module, a circulating oil way defined by a second cavity, a flow guide cover, a heat dissipation device, a circulating oil pump and related necessary connecting pipelines is additionally arranged. When the power module works, cooling water flows in from the near end of the power module and flows out from the far end of the power module below the radiator, in the process, the water temperature rises while the cooling water dissipates heat of the bridge arm chips, and the heat dissipation effect of the cooling water on the bridge arm chips is sequentially decreased from the near end to the far end. Meanwhile, the cooling oil circularly flows, flows through a cavity formed by the flow guide cover and the radiator after flowing out of the circulating oil pump and is directly cooled on the surface of the power chip, the oil temperature is increased while the cooling oil dissipates heat of the bridge arm chips, the heat dissipation effect of the cooling oil on the bridge arm chips is sequentially decreased from the far end to the near end, and the heat dissipation efficiency of the cooling oil on the bridge arm chips is greatly improved. And the heat dissipation effect is just opposite to that of the cooling water path. According to the technical scheme, the problem that an existing power module is not uniform in heat dissipation can be solved.

The invention relates to the technical field of compressor temperature control, and discloses a compressor temperature control system capable of preventing generation of condensate water, which comprises a sensing module, an execution module and a controller. The sensing module is used for collecting air temperature, relative humidity, system working pressure and circulating oil temperature parameters of the compressor in real time. The controller is configured to calculate the current pressure dew point of the system based on the air temperature, the relative humidity and the working pressure of the system; the pressure dew point serves as a floating lower limit, a preset system optimal working temperature upper limit serves as a fixed upper limit, and a dynamic safe working interval is determined; finally, a cooling unit and a heating unit in the execution module are cooperatively controlled to work according to the relation between the circulating oil temperature and the dynamic safety working interval. By establishing the dynamic safety lower limit changing along with the working condition, the problem that the compressor is prone to generating condensate water under the high-humidity or low-load working condition to cause oil emulsification is effectively solved, and accurate and energy-saving temperature control is achieved.

The utility model belongs to the technical field of hydraulic pipe cleaning, and particularly discloses a hydraulic pipeline oil string washing device which comprises an oil tank, an oil supply pipeline, an oil inlet pipeline, an oil return pipeline and a cooling loop. The oil supply pipeline comprises a lightering oil pump, an oil supply valve and an oil supply main pipe; the oil inlet pipeline comprises a circulating oil pump, a first oil inlet header pipe and a first oil inlet control valve are arranged between the oil tank and the circulating oil pump, and a second oil inlet header pipe, a one-way valve and a second oil inlet control valve are arranged between the circulating oil pump and the cleaned pipeline system; the oil return pipeline comprises a fine filter, a first oil return header pipe is arranged between the cleaned pipeline system and the fine filter, a second oil return header pipe is communicated between the fine filter and the oil tank, first oil outlet control valves are arranged on the first oil return header pipe and the second oil return header pipe, the fine filter is further communicated with an impurity removal control valve, and the impurity removal control valve is communicated with an impurity removal header pipe. According to the device, safe and reliable cleaning can be provided for pipeline systems with different pressure bearing and precision requirements, and the oil temperature can be controlled to achieve the optimal cleaning effect.

A power transformation equipment oil temperature prediction and abnormity early warning method based on a fuzzy algorithm comprises the following steps that real-time operation parameters and oil temperature historical data of power transformation equipment are collected, the data are preprocessed, and a high-quality input data set is constructed; constructing a fuzzy inference system considering multiple input factors, and setting a fuzzy membership function and an inference rule base; according to the fuzzy prediction result and the real-time oil temperature change, a self-adaptive dynamic safety threshold model is compared, a potential abnormal trend is identified, and automatic grading early warning is carried out according to the overtemperature grade; and corresponding exception type identifiers and disposal suggestions are generated and are pushed to the operation and maintenance platform through the communication module, so that remote operation and maintenance scheduling and response control are supported, and intelligent cooperative processing is realized. According to the invention, intelligent prediction of the oil temperature change trend under the influence of multiple factors is realized, the capability of sensing temperature rise abnormity in advance is improved, the accuracy of sensing the operation state of the equipment and the timeliness of early warning response are also remarkably improved, and the risk of equipment failure caused by the abnormal oil temperature is reduced.

The application discloses a traction transformer control cabinet and a rail train, and relates to the technical field of rail transit vehicles.The traction transformer control cabinet comprises a detachable shell and a control module arranged in the detachable shell; wherein the control module is used for determining the fan frequency of the fan in the cooling system of the traction transformer according to the first collection data sent by the whole vehicle controller of the rail train and the second collection data sent by the traction transformer, so as to utilize the fan frequency to perform frequency conversion control on the fan; the first collection signal comprises vehicle speed data, and the second collection signal comprises oil temperature data; through the arrangement of the traction transformer control cabinet, the control module in the traction transformer control cabinet performs frequency conversion control on the cooling fan according to the data such as the vehicle speed of the train and the oil temperature of the traction transformer, the low noise and the intelligentization of the traction transformer are realized, the noise of the rail train can be effectively reduced, and the passenger comfort is improved.

The invention relates to the technical field of power equipment monitoring and fault diagnosis, and discloses a power transformer fault early warning method and system. The method comprises the following steps: acquiring a load current sequence, an environment temperature sequence and a top oil temperature sequence of a transformer; calculating an initial actually measured temperature rise based on the top oil temperature and the environment temperature, and determining thermal response lag time through cross-correlation analysis; carrying out translation correction on the load current according to the lag time, and constructing a time-aligned excitation input set and an actually measured temperature rise sequence based on a common effective time window; substituting the excitation input set into a thermal circuit model based on a thermal balance differential equation to calculate a theoretical reference temperature rise, calculating a residual error in combination with an actually measured temperature rise sequence, performing moving average filtering, and constructing a fault feature vector; and inputting the fault feature vector into a fault diagnosis classification model to determine a fault type and severity, and generating a grading early warning instruction according to the fault type and severity. According to the method, thermal hysteresis interference can be eliminated, and accurate quantitative early warning of the latent thermal fault of the transformer under the dynamic working condition is realized.

The invention discloses a service life prediction method of an automobile shock absorber, and relates to the technical field of service life evaluation. The method comprises the steps that the engine speed, the torsional amplitude value, the engine oil temperature and the load torque are collected, and an engine parameter set is formed after preprocessing; standard parameters of engines of the same model are collected, a frequency spectrum peak value is obtained by processing torsional amplitude values in a parameter set, and the resonance frequency of the engines is calculated by combining the standard parameters; constructing a damper operation state threshold model based on an STL time sequence decomposition method, inputting engine oil temperature and load torque to obtain a threshold, comparing resonant frequency with the threshold, and determining a damper damping state; the torsional vibration change rate is calculated and compared with standard parameters of the same model to obtain the working state of the shock absorber; and constructing a shock absorber life prediction model based on an accumulative damage theory, inputting a damping state, a working state and an engine parameter set, and outputting residual life. According to the method, the multi-dimensional real-time working condition parameters are considered, so that the residual life of the automobile shock absorber is predicted more accurately.

The invention discloses a blockage prediction and alarm system for an oil absorption filter, and relates to the technical field of prediction and alarm, the system comprises a data acquisition module, a data processing module, a blockage quantification module and a prediction and alarm module, the data acquisition module periodically acquires the running state data of the filter; the data processing module adopts a Pauta criterion to eliminate abnormal data, calculates a unit flow pressure difference and a pressure difference change rate, and eliminates oil temperature viscosity interference through a viscosity-temperature characteristic compensation model to obtain a standard pressure difference; the blockage quantification module obtains an ideal pressure difference through a clean filter element baseline model, calculates an original blockage coefficient, and corrects through a time domain residual fusion mechanism to obtain a residual calibration blockage coefficient; the prediction and alarm module constructs a blockage time sequence prediction model based on the long-short-term memory network, generates a blockage coefficient prediction value in the next acquisition period to decide whether to trigger sound-light alarm, and realizes the preposed sensing and alarm of the blockage risk of the oil absorption filter.

The invention discloses an engine multi-vehicle-type adaptive NVH quality optimization method and system, and belongs to the technical field of automobile engine debugge.The method comprises the steps that after an engine is installed on a to-be-adapted vehicle, vehicle working condition data are collected in real time, the vehicle working condition data comprises a vehicle speed, an accelerator opening degree, an engine rotating speed, a gear, a hydraulic torque converter locking state and an engine oil temperature signal; the vehicle working condition data is compared with the working condition of the engine noise sensitive working condition, and whether the engine noise sensitive working condition is entered or not is recognized; when the engine has the noise sensitive working condition, an NVH control strategy embedded in an engine electronic control unit is activated; the NVH control strategy comprises adjustment of an engine ignition angle and oil injection parameters; the engine is controlled according to the ignition angle optimization control instruction and the oil injection parameter optimization instruction; and when the vehicle runs out of the working condition of the noise sensitive working condition of the engine or gear shifting is completed, the conventional combustion control logic is recovered. And the rising rate of the pressure in the cylinder is effectively reduced, so that the structural knocking noise within the range of 150-600Hz is inhibited.

According to the intelligent plunger pump temperature control method and system based on model predictive control, a thermodynamic model predictive control algorithm is introduced, key parameters such as the oil temperature of a plunger pump body, the water temperature of a water tank and the environment temperature are brought into a unified calculation model, and cooperative closed-loop control over a heating plate, a semiconductor chilling plate and a circulating pump is achieved. By constructing the heat balance equation of the lumped heat capacity system and solving the rolling optimization problem in the limited time domain, the heat load change of the plunger pump can be accurately predicted and adjusted in advance, the oil temperature is always stabilized in the preset target interval, and the temperature control precision is remarkably improved; meanwhile, mutual exclusion constraints of heating and refrigerating power are set, and weights are dynamically adjusted and optimized according to working conditions, so that meaningless consumption of energy is effectively avoided, and the operation cost of equipment is reduced; in addition, according to the control method, preheating, cooling and energy-saving modes can be automatically recognized, so that the plunger pump is rapidly started in the severe cold environment and stably operates in the high-temperature environment.

The invention discloses a compatible system for an MT test bench to adapt to an AT transmission and a test method, and belongs to the technical field of transmission test. The system comprises a driving motor base translation mechanism, a driving motor, a simulation crankshaft, a 6-to-8 adapter flange, a tested AT transmission, an oil pressure collection box, an engine oil external circulation device and the like. Mechanical adaptation is achieved through a 6-to-8 adapter flange and an I-shaped telescopic transmission shaft, a gear box can be switched between a constant speed mode and a speed reduction mode to adapt to different gears, a motor base translation mechanism is driven to adjust the coaxiality, and the oil temperature is controlled to be 105 + / -5 DEG C through an engine oil outer circulation device; the test method comprises the steps of preprocessing, assembly connection, initialization setting, test operation, monitoring recording and resetting, tests comprise a running-in test and a fixed gear durability test, oil pressure data are transmitted in two paths, and automatic shutdown is carried out when abnormity occurs. By transforming the idle MT rack, AT transmission test compatibility is achieved, and the advantages of improving the resource utilization rate, reducing the cost, enhancing the test adaptability and reliability and the like are remarkable.