2046 results about "Dieseling" patented technology

The invention discloses a digital twin intelligent test run system based on a marine medium-speed diesel engine and a monitoring method, relates to the technical field of monitoring, and is used for solving the problems of degeneration identification lag and low emission early warning precision of an oil injector. The system comprises a multi-source heterogeneous data preprocessing module and a running state intelligent diagnosis module. The multi-dimensional data acquisition module is used for acquiring in-cylinder pressure, crankshaft torsional vibration and transient air-fuel ratio signals to construct multi-dimensional data vectors, and the multi-dimensional data acquisition module is used for analyzing combustion fluctuation characteristics based on an attention mechanism LSTM (Long Short Term Memory) network, identifying early deterioration of an oil injector and outputting an oil injection consistency coefficient and a fault type identifier. The method comprises the steps that according to an oil injection consistency coefficient, electromagnetic valve response delay and combustion parameter correlation are tracked, a degradation trend is predicted, and emission early warning is generated; and according to prediction and early warning results, fuel injection compensation parameters are dynamically adjusted in the digital twinborn model, a recursive least square method is adopted to identify combustion parameters and feed the combustion parameters back to an electric control unit, and self-adaptive optimization and closed-loop control in the test run stage are achieved.

The invention discloses an intelligent peak regulation method with optimized combination of energy storage and conventional peak regulation means, and the method comprises the following steps: building a holographic situation awareness layer: capturing the voltage, current phase angle and frequency deviation of a power grid, and monitoring the pressure fluctuation in a diesel engine cylinder; data transmission and preprocessing: encrypting data of the miniature phasor measurement unit and the quantum sensor by using a quantum key distribution technology; the self-adaptive decision engine is used for performing Nash equilibrium calculation by utilizing a federal reinforcement learning architecture, through a local Agent based on a power generation / energy storage unit state autonomous optimization control strategy and in combination with a digital twin platform, solving multi-target conflicts of economy, reliability and carbon emission, and generating a global optimal scheduling instruction; the execution control layer is used for tracking resonance points and dispersing harmonic energy spectrums; dynamic topology reconstruction: a harmonic source is positioned by using a digital twin platform, and the topology of the energy storage system is automatically switched according to the harmonic frequency and position; continuously optimizing the digital twin platform; and full-process closed-loop feedback and self-learning are carried out.

The invention relates to the technical field of ship propulsion power generation system control, in particular to a constant-power rotating speed control method and system for a ship shaft generator, and the method comprises the following steps: obtaining operation state parameters and ship environment parameters of a ship propulsion power generation system; based on the operation state parameters and the ship environment parameters, the influence of the adjusting action of the shaft generator on the rotating speed of a main propulsion diesel engine and the influence of the adjusting action of a main propulsion diesel engine speed adjusting device on the output power of the shaft generator are pre-judged, and an interactive pre-judgment result is obtained; according to the interactive pre-judgment result, jointly deciding and generating a first adjusting instruction for adjusting an axle generator and a second adjusting instruction for adjusting a main propulsion diesel engine speed adjusting device; by introducing an interactive pre-judgment and joint decision-making mechanism, the negative interaction between the shaft generator and the main propulsion diesel engine speed regulation device can be effectively identified and eliminated, and the operation stability and safety of the ship under the severe sea condition are improved.

The invention discloses a two-stage optimization method for carbon constraint micro-grid energy management. The method comprises the following steps: establishing power balance constraints of various components in a micro-grid, an economic-low carbon joint objective function, optimization solution of diesel engine power, grid transaction, a load strategy and energy storage scheduling; the system-level CVaR tail risk index is decoupled to a short-time-period CVaR value according to the probability distribution of the system-level CVaR tail risk index and the time window area proportion, and the short-time-period CVaR value serves as a carbon over-quota emission risk constraint boundary and is transmitted to the intra-day level; actually measured wind and light load data are fed back to the prediction model for real-time correction in each period; constructing a robust optimization model to dynamically adjust conservative coefficients; the risk budget is used as a hard constraint, and the expected value of the excess carbon emission condition in the window is calculated in real time; a closed loop is formed. The intra-day rolling optimization provided by the invention is based on an ultra-short-term prediction technology, and the prediction error of the intra-day rolling optimization is only slowly increased in a finite time window, so that the prediction precision at the same time point is obviously superior to that of a day-ahead optimization result.

The invention discloses a diesel engine connecting rod structure parameter optimization method which specifically comprises the following steps: (1) obtaining load values, weights and stress values which can be borne by an oil extraction machine connecting rod under different connecting rod body structure parameters through finite element analysis, and taking the load values, the weights and the stress values as samples; (2) completing the training of a Kriging agent model based on the constructed sample; and (3) searching an optimal connecting rod body structure parameter in a feasible space based on a particle swarm algorithm by taking the connecting rod body structure parameter as a position code, taking a maximum load value which can be borne by the connecting rod and a lightweight design requirement as constraint conditions and taking a minimum stress value as a target function. The trained Kriging proxy model is used for stress values, bearable load values and weight corresponding to connecting rod body structure parameters of all position codes in the particle swarm algorithm, and then the maximum load value is found quickly, and the connecting rod body structure parameters corresponding to the minimum stress value are found under the lightweight design requirement.

A center hole is formed in a base, the lower end of a guide sleeve is coaxially fixed to the upper end of the base, a lower die is installed in the guide sleeve in a matched mode, and the lower end face of the lower die makes contact with the upper end face of the base. The conical section at the upper end of the valve rod and the lower half portion of the large-diameter section are matched with a lower die hole in the upper end of the center hole of the lower die, the upper die is arranged in the guide sleeve in a matched mode, an upper die hole in the lower end of the center hole of the upper die is matched with the large-diameter section of the valve rod, and the upper end of the upper die extends out of the guide sleeve. And the upper end of the valve rod is deformed and turned inwards until the belleville spring and the maximum-diameter position of the lower end of the valve head are completely wrapped in the stepped hole of the large-diameter section of the valve rod. According to the utility model, the technical problem that the valve rod assembly of the indicator valve cannot be directly assembled is solved, the problem that the valve head is arranged in the inner hole of the valve rod and the stroke of the valve is ensured by accurately controlling the length of the inner cavity when the valve head, the valve rod and the belleville spring of the indicator valve are assembled is effectively solved, the valve rod assembly is ensured to be smoothly assembled, and the assembling quality and the processing efficiency are ensured.

The invention particularly relates to an integrated simulation test system and method for a diesel engine speed regulation system, and belongs to the field of diesel engine speed regulation system testing. The system comprises a diesel engine analogue simulation module which is used for simulating and outputting the working mode of a diesel engine, responding to and entering an off-line test working mode or an on-line monitoring working mode, and providing off-line test working parameters or on-line monitoring working parameters for a diesel engine speed regulation system; and the diesel engine speed regulation system analog simulation test module is used for responding to enter an off-line test working mode or an on-line monitoring working mode and acquiring off-line test working state parameters or on-line monitoring working state parameters of the diesel engine speed regulation system in real time. According to the method, the simulation test of the diesel engine speed regulation system is carried out by using the device. The off-line test function verification of the diesel engine speed regulation system is realized, the function verification cost and risk of the diesel engine speed regulation system are reduced, the comprehensive test of the diesel engine speed regulation system is realized, and the usability and reliability of the functions of the diesel engine speed regulation system are improved.

Disclosed are an apparatus for a simulation test of diesel engine fuel spray in an alpine environment and a test method, the apparatus comprising a fuel storage and pretreatment device, a fuel injection system, an optical visualization system, an environment chamber, and a spray pretreatment system. In alpine environmental conditions, the apparatus can achieve high-pressure injection of liquid, separate injected atomized mist into fine droplets and impinge same on a wall surface by means of a multi-droplet generation apparatus and a wall surface apparatus, and observe and record the whole process by means of an optical visualization path. According to the present invention, the problem of difficulty in distinguishing droplets due to the coalescence of spray into a sheet is avoided, the costs of a traditional spray and droplet test solution can be significantly reduced, and the problem of a high level of dependence on a control program in a constant volume vessel solution is solved. According to the present invention, simulation of spray test in an alpine environment is possible, and the test apparatus has a simple structure. Moreover, it is possible to conduct regular research on free spray, multi-droplet wall impingement, spray wall impingement, and development characteristics thereof under conditions such as different altitudes and different temperatures.

The invention discloses a continuous passing type quenching conveying device for diesel engine camshafts in the technical field of diesel engine camshaft machining. The quenching conveying device comprises a first conveying mechanism, a plurality of camshaft fixing mechanisms and a plurality of quenching mechanisms, wherein the camshaft fixing mechanisms and the quenching mechanisms are arranged on the first conveying mechanism. Wherein the quenching mechanism comprises a bearing frame connected with the first conveying mechanism, a driving device arranged on the bearing frame and a split type induction coil connected with the driving device, and the split type induction coil comprises two sets of symmetrically-arranged arc-shaped coils and a driving part used for driving the two arc-shaped coils to move face to face or back to back. According to the quenching mechanism, the split type induction coil is driven by the driving equipment to move in the axial direction of the diesel engine camshaft main body for quenching work, the diesel engine camshaft main body does not need to be repeatedly clamped, transferred and reset, the quenching treatment work efficiency of the diesel engine camshaft main body is greatly improved, and the production efficiency is improved.

A diesel engine crankshaft residual stress and deformation relation prediction method belongs to the technical field of internal combustion engine key component manufacturing. The method comprises the steps of dynamically correcting a finite element model through multi-stage measured data, performing high-precision reconstruction of a crankshaft residual stress field, establishing a quantitative relation between stress distribution and deformation, and combining numerical simulation and response surface method optimization to realize high-precision residual stress distribution prediction. And further analyzing the release and redistribution rules of the residual stress in the material removal process. Residual stress distribution is actively controlled to prolong fatigue life, and stable production of high-precision and long-life crankshafts is ensured. The grinding feeding rate is reduced through active control over residual stress in the grinding process so that the tensile stress peak value in the layer depth direction can be reduced, and meanwhile it is guaranteed that the surface roughness is within a proper interval. A gradient cooling strategy is adopted, the cooling liquid flow is increased in the initial grinding stage, and surface layer thermal stress accumulation is restrained. And the grinding wheel linear speed is controlled, and grinding efficiency and residual stress inhibition requirements are balanced.

The utility model discloses a gearbox for an oil-electricity double-engine ship. The gearbox comprises a box body, the diesel oil input component comprises a first input shaft, a first driving gear is sleeved on the first input shaft, and the first input shaft is provided with a first transmission gear and a first clutch; the reversing shaft part comprises a reversing shaft, a second driving gear is sleeved on the reversing shaft, the reversing shaft is provided with a second transmission gear and a second clutch, and the second transmission gear is meshed with the first transmission gear; the motor input component comprises a second input shaft, the second input shaft is sleeved with a third driving gear in an empty mode, the third driving gear is meshed with a first driven gear, the second driving gear is fixedly sleeved with the first driven gear, and the second input shaft is provided with a third clutch; the output shaft component comprises an output shaft and a second driven gear, and the second driven gear is meshed with the first driving gear and the second driving gear. According to the scheme, the diesel engine or the motor is independently used for driving, intelligent switching of the diesel engine and the motor can be achieved at any speed, oil consumption is reduced, and power performance is improved.

The invention aims to provide a marine diesel engine operation parameter anomaly detection method based on spatial-temporal feature fusion, and belongs to the field of diesel engine detection. The method comprises the following steps: collecting time sequence data of multiple sensors under a normal working condition of a diesel engine, and dividing the time sequence data into a training set and a verification set; multi-sensor monitoring data of the diesel engine in an abnormal state are collected to form an independent test set. And establishing an MsBTC-Net formed by a diesel engine operation parameter predictor and an operation parameter anomaly detector, inputting the verification set into an MsBTC-Net predictor model, obtaining a predicted value of the verification set at each time step of the diesel engine monitoring parameter, and calculating a predicted residual by combining an actual value of the monitoring parameter. And then a Mahalanobis distance threshold value is calculated, and an MsBTC-Net operation parameter anomaly detector is constructed. According to the method, the multi-dimensional operation monitoring parameters of the diesel engine are predicted, the performance of abnormal detection of the operation parameters of the diesel engine is effectively improved, the detection sensitivity of early fault weak signals of the diesel engine is remarkably enhanced, and the method has engineering application value.

The invention discloses a hybrid energy storage power supply system for diesel engine replacement and an energy management method, and relates to the technical field of hybrid energy storage power supply and management methods. An assembly with the photoelectric conversion efficiency exceeding 23% and a 10KV-level string type inverter are adopted, and a photovoltaic-energy storage combined MPPT control function is integrated; the lithium iron phosphate energy storage system is matched with a bidirectional PCS and an active equalization technology, and is designed according to 1.5 times of daily peak-valley difference and 2 hours of emergency standby power; the diesel generating set group is started in a grading manner according to load gaps, and is matched with a 10KV / 380V intelligent charging unit; the coordination control center realizes two-dimensional prediction and coordinated scheduling based on an LSTM neural network, couples each unit through a 10KV intelligent bus system, divides load priorities, collects meteorological and equipment parameters, and constructs photovoltaic priority consumption, energy storage stabilization fluctuation, diesel generator guarantee emergency, and flexible and adjustable charging operation modes. The method has the advantages that the energy utilization efficiency is improved, the power supply stability is enhanced, the whole-cycle cost is reduced, limited operation and maintenance scenes are adapted, and diversified power supply requirements are met.

The invention provides a diesel engine cylinder fault diagnosis method and system based on MMFE-PSO-KELM, and the method comprises the steps: S1, collecting a vibration signal of the surface of a cylinder cover of a diesel engine cylinder and a rotating speed signal of a crankshaft, and carrying out the preprocessing of the vibration signal; s2, an MMFE algorithm is adopted to analyze and process the preprocessed vibration signals, and MMFE feature vectors rich in high-frequency and low-frequency fault mode information are constructed; s3, optimizing a regularization parameter C and a kernel function parameter sigma of the KELM model by using a PSO (Particle Swarm Optimization) algorithm, and searching an optimal parameter combination which maximizes the classification accuracy by taking the classification accuracy as a fitness function; and S4, constructing a KELM diagnosis model based on the optimal parameter combination, and performing fault diagnosis on the diesel engine cylinder by taking the high-frequency and low-frequency fault mode information extracted by the MMFE algorithm as input. According to the method, strong noise interference can be effectively inhibited, fault feature information can be comprehensively reserved, KELM key parameters can be optimized, and the accuracy and reliability of fault diagnosis of the diesel engine cylinder are improved.

The invention provides a vehicle diesel engine bench simulation emission test method, system, device and medium, and belongs to the bench test technology field, a test bench and a test device are configured, a flowmeter and an analyzer are calibrated through a linear regression equation, and a mapping relation between a measured value and an output quantity is established; an engine transient working condition model is constructed based on real vehicle data, and mapping of the rack control process and the real vehicle operation working condition is achieved; configuring the rotating speed, the torque, the air inlet temperature and the air inlet humidity controlled by the rack as boundary conditions, evaluating the control following performance through a correlation coefficient calculation mode, and verifying the environmental parameter consistency based on a mean value deviation; calculating the exhaust flow, and configuring measurement data based on the intake flow and the fuel consumption; executing a transient test, and obtaining real-time data of an engine running state and discharged pollutants; and under the condition that the double boundary condition constraints are met, carrying out equivalence analysis on a rack and a real vehicle emission result.

According to the off-grid energy management method, the real-time state of charge (SOC) of an energy storage battery is compared with a preset high electric quantity threshold value and a preset low electric quantity threshold value, and a diesel engine priority mode set by a user and real-time load and power conditions are combined; and dynamically selecting an optimal solution from a plurality of preset operation conditions. Through multi-source cooperation and intelligent scheduling, start-stop and working modes of the photovoltaic module, the diesel engine module and the inverter module can be intelligently controlled, seamless switching and optimal distribution among different energy sources are realized, power supply continuity and economy are ensured, and the service life of energy storage equipment is effectively prolonged.

The invention relates to the technical field of internal combustion engine superchargers, and discloses a time window dynamic adjustment method and system for fault diagnosis of a diesel engine supercharger, and the method comprises the steps: extracting time sequence data of key characteristic parameters of the diesel engine supercharger through mechanism analysis when the fault diagnosis of the diesel engine supercharger is carried out based on deep learning; after preprocessing, inputting into a fault diagnosis model; and adaptively adjusting a time window of the fault diagnosis model based on the principal component analysis result, so that the time window is adjusted according to the fluctuation change of the feature data. According to the method, the time window of the turbocharger in the actual working condition data can be dynamically adjusted, the concept of time domain-feature domain double closed-loop control is utilized, principal component analysis is improved from a traditional dimension reduction tool to a dynamic system regulator, a quantitative mapping model of the window length and the working condition data is established, and on the premise that feature information is guaranteed, the real-time performance of the turbocharger is improved. And the data processing amount of the window can be effectively reduced.

The invention relates to a vibration control design method for a ship low-speed motor direct propulsion long shafting, and the method comprises the steps: determining the position of a low-speed motor output flange and the central position of a propeller, determining the positions of a thrust bearing, an intermediate bearing, a tail pipe bearing and the like, arranging the span of the bearings, arranging the number of the bearings, and calculating the shafting strength. Torsional vibration calculation of the long shaft system of the low-speed motor, torsional vibration calculation result analysis, centering calculation of the long shaft system of the low-speed motor, cyclotron vibration calculation of the long shaft system of the low-speed motor, longitudinal vibration calculation of the long shaft system of the low-speed motor, fatigue analysis of a thrust bearing, verification of whether the thrust bearing meets the load requirement or not, shaft system jacking verification, and the like. And finally verifying the shafting vibration control design effect through a navigation test. Different from conventional diesel engine propulsion and high-speed motor propulsion shafting design, the method starts from the characteristics of a low-speed motor direct propulsion shafting, and analysis is carried out through shafting strength design, torsional vibration, centering, rotation, longitudinal vibration, installation and other systems, so that the risks of shafting load imbalance and abnormal vibration are avoided.

The invention discloses a diesel engine piston material, a diesel engine piston casting method and a diesel engine piston, and relates to the technical field of composites.The diesel engine piston material comprises, by weight, 12.0%-12.5% of Si, 5.6%-5.8% of Cu, 3.0%-3.4% of Ni, 0.1%-0.3% of Mg, 0.1%-0.3% of Mn, 0.4%-0.6% of Fe, 0.10%-0.14% of Ti, 0.10%-0.14% of V, 0.10%-0.14% of Zr, 0.02%-0.06% of Cr and the balance Al and alkali metal impurity elements. The high-strength and heat-resistant aluminum alloy material special for the diesel engine piston is obtained by taking the aluminum alloy as a base body and coordinating multiple alloy elements and accurately regulating and controlling the proportion of all the alloy elements, the material meets the long-term service requirements of the high-load diesel engine piston at the high temperature of 350 DEG C and under the explosion pressure of 20 Mpa of 107 times or above high-frequency reciprocating loads, and the service life of the high-load diesel engine piston is prolonged. And the working conditions of high detonation pressure and thermal load of the diesel engine piston are met, so that the high-temperature mechanical property, long-term service reliability and safety stability of the piston are improved.

The invention belongs to the technical field of vehicle rear axles, and particularly relates to a coal mine explosion-proof diesel engine trackless rubber-tyred vehicle rear axle which comprises a rear axle body, shaft heads are installed at the two ends of the rear axle body respectively, half axle assemblies are fixedly installed on the side walls of the shaft heads, brake hubs are fixedly installed on the half axle assemblies, and the brake hubs are fixedly installed on the rear axle bodies. A main speed reducer assembly is installed in the middle of the rear axle body, fixing seats are fixedly installed on the two sides of the top of the rear axle body, damping devices are correspondingly installed on the tops of the fixing seats, the radial impact force on the rear axle in the vehicle operation process can be greatly reduced through the damping devices, and the rear axle is effectively prevented from being damaged and losing efficacy. The anti-collision devices are symmetrically arranged on the two sides of the main speed reducer assembly, an adjusting mechanism is arranged on one side of each anti-collision device, the adjusting mechanisms are connected with the anti-collision devices through transmission shafts, and multi-angle adjustment of the anti-collision devices is achieved through the adjusting mechanisms. When the rear axle is collided in the working process, key components of the rear axle can be effectively protected, and the service life is prolonged.

The invention aims to provide a marine engine lubricating oil system fault diagnosis method based on multi-source domain transfer learning, and belongs to the field of engine fault diagnosis. Comprising the following steps: carrying out multi-working-condition signal acquisition and pretreatment on the marine engine lubricating oil system; constructing a multi-source domain transfer learning model; performing multi-source domain transfer learning model training and optimization to obtain a diesel engine fault diagnosis model based on multi-source domain transfer learning; and performing cross-working-condition fault diagnosis on the diesel engine to obtain a fault diagnosis result. According to the method, multi-source domain data collected under different working conditions are integrated, and deep feature extraction and fusion of the monitoring signals of the lubricating oil system of the engine are realized. According to the method, feature distribution between each source domain and the target domain is effectively aligned, and common fault features in multi-source-domain data are fully mined and utilized, so that the diagnosis model has relatively high cross-working-condition diagnosis capability while realizing fault prediction.

The invention relates to the technical field of collection equipment, in particular to a sample collection device for diesel engine gas detection. A first pipe opening, a second pipe opening and a third pipe opening are formed in the pipe body; a collecting barrel is installed in the first pipe opening, a limiting mechanism used for being connected with a flue of a diesel engine is installed on the second pipe opening, a flow monitoring mechanism is installed on the third pipe opening, and the particulate matter collecting barrel, the flow monitoring mechanism and the flue connecting mechanism are integrated on one pipe body, so that particulate matter collection and gas flow measurement are synchronously carried out; measurement errors caused by fluctuation of working conditions are greatly reduced, and the accuracy and reliability of detection data are improved.

The invention discloses an exhaust temperature calculation method and device, an engine and a vehicle. An exhaust temperature calculation method is suitable for an engine comprising a turbocharger and a temperature sensor, the temperature sensor is arranged on the downstream of the turbocharger, and the exhaust temperature calculation method comprises the steps that operation parameters of the engine and measurement data of the temperature sensor are obtained; determining an exhaust temperature estimation value according to the operation parameters; a heat transfer equation is established according to energy conservation, iteration is conducted in the heat transfer equation according to the exhaust temperature estimated value, and an exhaust temperature model value is determined; and determining an exhaust temperature calculation value according to the measured data and the exhaust temperature model value. The technology does not need to depend on the high accuracy of a model, when the system is in a non-standard operation state or system parameters change, good calculation accuracy can still be kept, the original exhaust temperature of the diesel engine can be accurately and rapidly calculated, meanwhile, a sensor arrangement scheme is optimized, the hardware cost is effectively saved, and the fault occurrence probability is reduced.

The utility model relates to the field of oil pumps, in particular to a centralized high-pressure common rail system. The common rail system comprises a PVC valve, a right cross rail connecting pipe, a left cross rail connecting pipe, a right high-pressure common rail, a left high-pressure common rail, a high-pressure oil pipe A, a high-pressure oil pipe B, a high-pressure oil pipe C, a safety valve and a rail pressure sensor, one side of the PVC valve is communicated with the right high-pressure common rail through the right cross rail connecting pipe, and the other side of the PVC valve is communicated with the left high-pressure common rail through the left cross rail connecting pipe. And a rail pressure sensor is mounted at the end of the right high-pressure common rail. The left high-pressure common rail and the right high-pressure common rail are connected at the rear end of the diesel engine through the left high-pressure common rail and the right high-pressure common rail, so that oil pressure in oil cavities of the left high-pressure common rail and the right high-pressure common rail tends to be consistent; the high-pressure common rail is of a double-layer pipe structure, and the high-pressure oil pipe and the high-pressure common rail are connected and sealed through a ball head. The high-pressure common rail inner pipe is an integral steel pipe, and the high-pressure common rail outer pipe is a sectional steel pipe, so that the high-pressure common rail has better safety and leakproofness.

The utility model discloses a diesel engine flywheel gear ring gap detection device, which comprises a base, a rotating shaft, an inner gear, an outer gear and a measuring instrument, the base is detachably arranged at the connection position of a flywheel housing and a starting motor, the rotating shaft is arranged on the base through a bearing, and the inner gear is arranged at one end of the rotating shaft, extends into the flywheel housing and is meshed with a flywheel gear ring. The outer gear is installed at the other end of the rotating shaft, located outside the flywheel housing and close to the measuring instrument, the inner gear and the outer gear rotate synchronously, and the measuring instrument detects rotation of the outer gear. During measurement, the base is installed on the flywheel cover shell, the meshing state is fed back to the outer gear through meshing of the inner gear and the flywheel gear ring, then the clearance of the gears is reflected through rotation of the outer gear, the clearance amount of the inner gear and the flywheel gear ring can be clearly measured, and the measurement accuracy and convenience are improved.

The utility model provides supporting and rotating equipment for assembling crankshaft parts and belongs to the technical field of diesel engines. Comprising a bottom support, a movable crankshaft supporting frame used for supporting a crankshaft is arranged on the upper portion of the bottom support, and the position of the movable crankshaft supporting frame can be adjusted in the length direction of the bottom support so as to adapt to supporting of crankshafts with different lengths; a driving motor is arranged at one end of the bottom support, an output shaft of the driving motor is coaxial with a crankshaft supported on the movable crankshaft supporting frame after being adjusted, and the output shaft of the driving motor is connected with a crankshaft end flange through a positioning connecting piece so as to control rotation of the crankshaft. According to the utility model, the assembly of all counterbalances can be completed by hoisting the crankshaft at one time, the time for assembling and hoisting equipment is shortened, the production efficiency is improved, and the safety is improved at the same time.

The invention relates to the field of monitoring, sensing and early warning, and discloses a marine diesel engine alarm system which comprises a data acquisition module used for acquiring various physical parameters in the operation process of a marine diesel engine; the data preprocessing module is used for carrying out denoising, normalization and time synchronization processing on the physical parameters; the state modeling module is used for constructing a mathematical model reflecting the running state of the diesel engine based on the preprocessed physical parameters; the feature extraction module is used for extracting feature information reflecting a fault trend or disturbance from the mathematical model; the alarm judgment module is used for generating an alarm signal according to the feature information extracted by the mathematical model; and the alarm output module is used for outputting the alarm signal, recording alarm information and feeding back the alarm information to a system management end. According to the invention, through multi-dimensional parameter fusion and a self-adaptive alarm mechanism, the accuracy and response speed of fault early warning of the marine diesel engine are improved, and false alarms and missing alarms are reduced.

The utility model belongs to the technical field of mechanical structures, and particularly relates to a hybrid power system of a combine harvester, which comprises a master controller, a battery component, a generator, a threshing mechanism, a header conveying mechanism, a diesel engine, a traveling mechanism, a fan device and an auger vibrating screen mechanism. The battery assembly and the generator are electrically connected with the master controller. The diesel engine is electrically connected with the master controller through the engine controller; the threshing mechanism and the header conveying mechanism are electrically connected with the master controller through the electric drive unit. The power output end of the diesel engine is sequentially connected with the fan device, the walking mechanism and the generator, and a clutch I is arranged between the walking mechanism and the diesel engine; and the auger vibrating screen mechanism is in transmission connection with the power output end of the fan device. According to the technical scheme, energy utilization and economical efficiency are both considered, pollutant emission is reduced, endurance and operation efficiency is improved, power transmission control is flexible, mechanism driving modes are diversified, and many disadvantages of a traditional power system are overcome.

The invention discloses a marine high-pressure common rail diesel engine MPC combustion control method based on a physical informatization neural network, and belongs to the field of marine high-pressure common rail diesel engine control. The problems that physical consistency of a model and a real machine is ignored and the generalization ability of the model is poor due to the fact that only data driving is relied on are solved. The method comprises the following steps: keeping a combustion midpoint unchanged, and acquiring in-cylinder pressures, in-cylinder maximum pressure rise rates, indication heat efficiency and emission data of different pilot injection fuel ratios and pilot main injection positive time intervals; calculating the average indicated pressure circulation change of the diesel engine, screening data and calculating the accumulated heat release amount and the combustion midpoint; obtaining an influence rule of related characterization parameters of combustion in a diesel engine cylinder, and determining a crank angle corresponding to pilot injection timing, a pilot injection fuel ratio, a pilot main injection interval boundary and an upper limit of a maximum pressure rise rate of cylinder pressure; a diesel engine in-cylinder combustion prediction output model and an MPC controller are constructed; and updating control parameters and combustion state data to realize closed-loop control. The method is used in energy-saving and emission-reducing fields.

The invention relates to the technical field of welding, in particular to a fixing mechanism of a welding machine for a diesel engine fuel tank, which comprises a first station, a second station and a third station, the second station and the third station are movably arranged on the rack and are controlled by the first driving structure to move on the rack; the sealing heads are placed on the first station and the third station, the barrel is placed on the second station, the first driving structure controls the second station and the third station to be close to each other and synchronously moves towards the first station till the two ends of the barrel are attached to the sealing heads, and assembling is completed. Therefore, the welding efficiency is ensured.