382 results about "Common rail" patented technology

The common rail oil injector with the static leakage structure comprises an oil injector body, a control valve seat, a control valve matching part, a needle valve assembly and a needle valve body, and is characterized in that a middle hole pressure storage cavity is formed in the oil injector body and used for containing the control valve matching part and the needle valve assembly; the control valve matching part serves as the only static leakage matching part and is composed of a control valve sleeve and a control valve rod in clearance fit with the control valve sleeve, a static oil return channel comprising a first inclined oil return hole, a first vertical oil return hole and an annular groove is constructed in the control valve sleeve, a second oil return through hole in the high-pressure sealing face of the control valve seat is matched, and a specific fuel leakage backflow path is formed. Compared with a traditional 2000 bar common rail oil injector, static leakage matching parts are reduced, the fuel oil leakage amount is greatly reduced, oil consumption is effectively reduced, carbon emission is reduced, meanwhile, the reliability of the oil injector is improved, and the service life of the oil injector is prolonged. The middle hole pressure storage cavity can reduce oil injection pressure fluctuation, and the average effective injection pressure and the multi-time oil injection precision are improved. The oil injector body and the needle valve body are simplified in structure, and machining difficulty and manufacturing cost are reduced.

The invention relates to an intelligent control technology of an internal combustion engine, in particular to a multivariable cooperative control method of a dual-fuel engine, which realizes dynamic optimization matching of fuel injection and an air system through deep reinforcement learning and multivariable decoupling control technologies. According to the method, a dual-fuel engine multivariable cooperative control system based on deep reinforcement learning and dynamic decoupling is constructed, the dual-fuel engine multivariable cooperative control system is composed of an air system control layer, a multivariable decoupling layer and a fuel injection control layer, and the air system control layer controls the fuel injection control layer through a TD3-PID algorithm according to the vehicle speed, the vehicle speed and the vehicle speed. The rotating speed N, the torque T, the common rail pressure Prail, the fuel temperature Tfuel and the mixed fuel density rho mix are operated in real time to serve as state variables, data are collected and processed, and the dynamic adjustment amount of the electronic throttle valve is obtained; by means of a PSO-PID decoupling mechanism and a DDPG-PID intelligent control algorithm, decoupling regulation and control over the dual-fuel dynamic ratio, the EGR rate and the supercharging pressure according to working condition changes are achieved, the economical efficiency, the emission performance and the dynamic performance of the dual-fuel engine under the dynamic operation working condition are remarkably improved, and the method has the advantages of being high in self-adaptive capacity and high in robustness.

The invention belongs to the technical field of ship control, and particularly relates to a multi-mode switching control device of a ship new energy hybrid power common rail system, which comprises a power cabin, the interior of the power cabin is divided into an internal combustion engine cavity, a motor cavity and a battery cavity through laminates and partition plates, and an internal combustion engine, a motor and a battery pack are respectively mounted in the power cabin; a first paddle shaft is installed at the driving end of the motor, an internal combustion engine power connecting-in mechanism is arranged in the internal combustion engine cavity, a second paddle shaft is installed in the internal combustion engine cavity through the internal combustion engine power connecting-in mechanism, the first paddle shaft and the second paddle shaft penetrate through the power bin, and a transmission mechanism is arranged between the first paddle shaft and the second paddle shaft. The double-propeller reverse braking device has the advantages that double-propeller reverse braking can be completed within the shortest time in a ship braking mode, the ship braking efficiency is greatly improved, fuel is saved, and pollutant emission is reduced.

The invention aims to provide a solid hydrogen storage hydrogen closed cycle hydrogen source generator for an underwater vehicle, which belongs to the field of dehydrogenation devices and comprises a reactor, a pressure stabilizing common rail pipe, a hydrogen storage material delivery pump, a solid hydrogen storage material storage unit, a solid hydrogen storage material spraying device, a product collecting device and a hydrogen storage unit. The hydrogen storage material conveying pump is connected with the pressure stabilizing common rail pipe, the solid hydrogen storage material storage unit and the solid hydrogen storage material spraying device, the hydrogen storage unit is connected with the pressure stabilizing common rail pipe, and the reactor is connected with the hydrogen storage unit. The solid hydrogen storage material is used for releasing hydrogen, one part of hydrogen is conveyed to the fuel cell to react for power output of the underwater vehicle, the other part of circulating hydrogen assists the hydrogen storage material in injection, and an underwater closed circulation mode suitable for the underwater vehicle is achieved. The solid hydrogen storage material conveying module and the circulating hydrogen supply module are matched, and rapid mixing of the solid hydrogen storage material and hydrogen and large-flow injection of the solid hydrogen storage material are achieved.

The invention relates to the technical field of fuel supply systems, in particular to a fuel supply device and an engine system. The fuel supply device comprises a methanol fuel line and a gasoline fuel line, the gasoline fuel line comprises a gasoline tank, a gasoline pump and a first common rail pipe which are communicated in sequence, and the methanol fuel line comprises a methanol tank, a methanol pump and a second common rail pipe which are communicated in sequence; the fuel supply device comprises a first three-way valve, a second three-way valve, a third three-way valve, a pressure sensor and a control unit, the first three-way valve is arranged between the methanol tank and the methanol pump, the second three-way valve is arranged between the gasoline tank and the gasoline pump, the first three-way valve is connected with the second three-way valve, and the third three-way valve is arranged between the gasoline pump and the second common rail pipe; the pressure sensor detects the pressure value in the second common rail pipe and is in signal connection with the control unit, and the control unit controls opening and closing of the first three-way valve, the second three-way valve and the third three-way valve according to the pressure value so that when the methanol pump breaks down, the gasoline pump can replace the methanol pump to work.

The invention relates to the technical field of high-pressure hydrogen storage of hydrogen fuel cell automobiles, and provides a high-pressure hydrogen storage bottle opening combination valve with a streamline runner and a control method. The combination valve integrates a high-pressure stop valve, a two-way flow regulating valve, a filter and a pressure / temperature / flow sensor, an air supply channel, an air inflation channel, a discharge channel and a cooling channel are designed, and the air supply channel and the air inflation channel are provided with a common rail type channel. A pilot-operated pressure reducing valve and a main runner bidirectional flow regulating valve are additionally arranged on the gas supply channel to form a two-stage pressure reducing system, so that the pressure and flow of hydrogen at an outlet are effectively limited, and the hydrogen is safely conveyed to a fuel cell; a redundant one-way valve is additionally arranged on an inflation channel to achieve rapid filling. Flow resistance and turbulent flow dissipation are remarkably reduced through a streamline channel, a sealing interface is reduced through modular integration, actuation response and power density are improved, and safety and stability of pressure reduction gas supply and high-pressure filling working conditions, intrinsic safety of the system and reliability of the whole life cycle are ensured.

The invention relates to the technical field of diesel engine fuel supply, in particular to a variable stiffness spring simulation design method for a high-pressure common rail pump. Comprising the steps of establishing a multi-physics field coupling model based on simulation software; establishing a thermodynamic module; simulating the movement of the plunger; simulating the movement of the valve core; establishing a fuel pressure dynamic change model; calculating the spring stiffness; calculating a target adjustment parameter; optimizing a spring stiffness coefficient: adjusting the spring stiffness coefficient through a genetic algorithm; a population is set and initialized, then an operation method is selected, crossover operation is carried out, and filial generation individual data is obtained; outputting an optimal parameter; optimal target parameters are calculated, specifically, the optimal parameters are introduced into simulation software, so that the maximum collision speed V of the valve element is reduced, and the system volume efficiency L is improved; by using the variable stiffness spring, the collision speed can be effectively reduced, the impact stress between the valve element and the valve seat is reduced, the fatigue damage between the valve element assemblies is reduced, and the service life of the pump valve assembly of the high-pressure common rail pump is prolonged.

The present invention relates to the technical field of two-stroke engines, and discloses a multi-cylinder ignition type air-injection two-stroke direct injection multi-fuel design structure, which includes a fuel system, an intake system and a mixed rail air-injection system. The multi-cylinder ignition type air-injection two-stroke direct injection multi-fuel design structure has the following characteristics: intake boosting technology: using an air compressor to achieve intake boosting, thereby improving engine performance; air-assisted boosting technology: using an air compressor to achieve in-rail auxiliary boosting, thereby increasing the degree of mixing of fuel and air and improving engine performance; air-injection cylinder direct injection technology: the atomized particle diameter of the existing high-pressure common rail technology is about 10-15 microns. Through the air-injection technology, the mixed particles of fuel and air are more thoroughly atomized, and the diameter of diesel can be made to 5-8 microns, thereby realizing ignition type cylinder direct injection; and multi-fuel driving technology: it is easier to ignite low-ignition-point fuels, thereby achieving full combustion in different oil environments such as gasoline, kerosene, diesel, and alcohol gasoline.

The invention discloses an engine, and relates to the technical field of engines, the engine comprises a control module, the control module is in communication connection with a fuel oil module, a pressurization module and a gas distribution module, and the control module is configured to collect operation parameters of the engine and control and adjust the fuel oil module, the pressurization module and the gas distribution module; the fuel oil module is configured to adjust fuel injection timing and common rail pressure of the engine, the pressurization module is configured to adjust pressurization pressure of the engine, and the gas distribution module is configured to adjust gas distribution timing of the engine. Economical efficiency and emission deterioration caused by in-cylinder combustion state change of the engine due to factors such as environment change, manufacturing difference, part aging and fuel property change are made up, and therefore consistency and stability of the combustion state of each cylinder can be guaranteed; the adjustable and controllable combustion path is realized, and the self-adaptive flexible combustion effects of inhibiting engine combustion noise, improving fuel economy, controlling emission and the like under all working conditions are achieved.

The invention belongs to the technical field of vehicle and ship power testing, and particularly relates to a new energy ship hybrid power common rail system operation testing device which comprises a testing pool, a battery pack body is arranged in the testing pool, and a simulation testing assembly is arranged on the surface of the testing pool. The simulation test assembly comprises a sealing test push plate arranged in the test pool, a simulation test ship enabling water to fluctuate in the test pool through the sealing test push plate, a vehicle and ship test motor, a first rotating disc, a first rectangular frame, a first rotating shaft, a lower connecting rod, a second rectangular frame, an auxiliary rotating rod, a rectangular support and a second rotating shaft. Through cooperative operation of a mechanical structure, waves under different sea conditions are simulated in the test pool, impact is generated on the simulation test ship, the power output of the battery pack is changed, the charging and discharging performance and the working stability of the battery pack are tested, wave parameters can be adjusted, waves are eliminated through an inclined stop lever, water splashing is prevented through a protective cover, and the service life of the battery pack is prolonged. And the test effect and safety are improved.

According to the high-pressure common-rail oil injector, through an innovative electromagnetic valve wire leading-out method, only fewest parts need to be reserved for an electromagnetic valve, a series of parts such as adapters and supports are omitted, the whole injection molding process is omitted, and therefore the purposes of simplifying the structure and reducing the cost are achieved.

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 discloses a method and a system for monitoring pressure abnormity of a fuel oil common rail pipe of a marine main engine. The method comprises the following steps: acquiring historical operation parameter data and constructing a data set; the historical operation parameter data comprises historical host load data, historical host rotating speed data and historical fuel oil common rail pressure data; historical operation parameter data are preprocessed, an SVDD model is constructed and trained based on the historical operation parameter data, the model obtains a historical normal data hyper-sphere in a three-dimensional feature space, and the center and the radius of the hyper-sphere are obtained; similarly, real-time operation parameter data collected in real time are preprocessed and then input into the model, the distance between the real-time operation parameter data and the center of the hypersphere is obtained, and the value of the distance is compared with the value of the radius of the hypersphere in historical normal data; and when the numerical value of the distance is large, it is judged that the real-time operation parameter data is within an abnormal range, the fuel oil common rail pressure of the ship main engine is in an abnormal state, and an alarm signal is triggered. The method has the effect of low error rate.

The invention relates to a method for predicting the fatigue life of an oil supply element of a high-pressure common-rail pump. The method comprises the following steps: acquiring the structural composition, load condition, failure form and stress analysis result of the oil supply element of the high-pressure common-rail pump of a diesel engine; key design parameters are obtained; carrying out single-factor test design and response surface test design; establishing a finite element model of the oil supply element, and obtaining stress distribution conditions of the oil supply element under different stress analysis results; solving the stress field finite element model, and recording a calculation result; obtaining single-factor regression analysis and response surface analysis of the key design parameters on the maximum equivalent stress of the key parts; under the same working condition, the stress level of the oil supply element is greatly reduced; predicting the fatigue life of the oil supply element of the high-pressure pump under different key parameter design values; predicting the maximum equivalent stress of the oil supply element under different key parameter design value combinations; and the research and development cost is greatly reduced.

The present application provides a novel low-pressure methanol pipeline structure and process method. The novel low-pressure methanol pipeline structure includes a common rail pipe and a supply pipe. The common rail pipe comprises an inner pipe and an outer pipe, each of which is coaxially sleeved and fixed by flanges at both ends. The inner pipe comprises a first inner pipe, an inner module, and a second inner pipe, which are sequentially connected. The inner module has a connection hole. The outer pipe comprises a connected integral outer pipe and two halves. The integral outer pipe covers the inner module, and the integral outer pipe has an outer pipe joint seat corresponding to the connection hole of the inner module. The supply pipe comprises a third inner pipe, an intermediate pipe, an outer pipe, and a threaded joint, which are sequentially sleeved from the inside to the outside. The end of the third inner pipe is exposed through the end of the outer pipe and at least partially connected to the connection hole to connect to the inner module. One end of the threaded joint is sleeved on the end of the outer pipe, and the other end is sleeved on the wall of the third inner pipe via a two-half ferrule. The outer pipe joint seat is sleeved on the end of the threaded joint.

According to an aspect of the present application, there is provided a radially deformable volume splitter (100; 200) for a fuel injection system (1) of a spark-ignition engine (2). The volume splitter (100; 200) can be tubular and elongate, extending along a longitudinal axis from a first end (102) to a second end (104). The volume splitter (100; 200) can comprise a deformable longitudinal slot (116) operable to deform the volume splitter (100; 200) radially from a first state for insertion into a cavity (18; 218) of the emulsion injection common rail (10) to a second state for use within the cavity (18; 218), and a set of slots (112a-112k) arranged on an outer surface (106) of the volume splitter (100; 200) to connect, in use, an inlet (20) of the cavity (18; 218) to one or more outlets (22a-22d) of the cavity (18; 218).

The invention discloses a test system, a test method and a test device for a common rail system of a diesel engine, and a storage medium. The test system comprises a driving module which is electrically connected with an oil supply pump of the diesel engine common rail system and is used for driving the oil supply pump to operate; the detection module is arranged on the diesel engine common rail system and used for detecting working condition parameters of the diesel engine common rail system; and the controller is electrically connected with the driving module and the detection module. The detection module can monitor working condition parameters such as oil pressure, temperature and flow of the common rail system in real time, comprehensiveness and accuracy of the testing process are ensured, the controller receives and processes data transmitted by the detection module, whether the common rail system is in a normal working state or not is judged through analysis, and the driving module is controlled to stop working in time. According to the invention, the technical problem of common rail system fault processing delay in the prior art is solved.

The utility model belongs to the technical field of oil injectors, and particularly discloses a common rail oil injector controlled by a three-way valve, which comprises an oil injector body, an electromagnetic valve assembly, a switch valve, a metering valve, the three-way valve and a needle valve assembly, a switch hole is formed in the end face, close to the switch valve, of the metering valve. The metering valve is provided with a first control cavity communicated with the switch hole. The three-way valve is provided with a third oil hole communicated with the oil sprayer body, and the third oil hole is communicated with the first control cavity through a third buffer groove and the first buffer groove; the third oil hole is communicated with the second control cavity through the third buffer groove, the first buffer groove and the second buffer groove; the second control cavity is communicated with the first control cavity through the second buffer groove and the first buffer groove; the first buffering groove, the second buffering groove and the third buffering groove are used for buffering flowing stress of fuel oil, so that smooth flowing of the fuel oil in the three-way valve is improved, fatigue damage of the fuel oil to the three-way valve is delayed, and the service life of the fuel injector is prolonged.

The object of the present invention is to provide a combustion system and a combustion method for a diesel and ammonia dual-fuel engine based on a composite EGR circuit, including a combustion system, an electronic control system, a composite EGR circuit system, a variable valve system, a high-pressure common rail fuel system, and an ammonia supply system. The composite EGR circuit system includes three circuits: 1. an in-cylinder high-temperature EGR circuit based on variable valve timing, 2. an out-of-cylinder low-flow low-temperature EGR circuit, and 3. an out-of-cylinder high-flow low-temperature EGR circuit. The electronic control system controls the two concentric double-needle valve fuel injectors and the in-cylinder direct injection ammonia injector with a flexible injection strategy in combination with the composite circuit EGR system according to different working conditions and the combustion characteristics of the fuel, which can effectively control the mixing characteristics and ignition characteristics in the cylinder, thereby optimizing the in-cylinder combustion and significantly reducing emissions at the same time. The present invention can improve the performance of the engine under all working conditions, achieve high combustion efficiency and low emissions, and has good adaptability to low-temperature environments.

The application discloses a starting device for a marine methanol engine, which comprises a compressed air control unit, a compressed air starting unit, a supplementary combustion unit, a rotating speed signal sensor and a plurality of Hall sensors. The compressed air control unit comprises a pressure reducing valve, a first one-way valve and a first electromagnetic reversing valve. The compressed air starting unit comprises a first electromagnetic on-off valve, a second electromagnetic reversing valve, a first pneumatic reversing valve, a second one-way valve, a second pneumatic reversing valve and a silencer. The supplementary combustion unit comprises a second electromagnetic on-off valve, a common rail pipe, a supplementary combustion gas injection valve, a third one-way valve and a third electromagnetic on-off valve. The starting device can quickly realize the cold state starting and the hot state starting of the marine methanol engine by using a small number of valve combinations, has high automation degree and good integration degree, and conveniently and efficiently solves the difficult starting problem of the marine methanol fuel engine.

The invention relates to the technical field of engines, in particular to a marine methanol engine combustion control method and system which comprises a high-pressure common rail module, an injection quantity control module, an injection time control module, a multi-nozzle layout module and a preheating module. The high-pressure common rail module is electrically connected with the injection quantity control module, the injection time control module, the multi-nozzle layout module and the preheating module, and the multi-nozzle layout module is electrically connected with the injection quantity control module, the injection time control module and the preheating module, so that the injection quantity and the injection time of methanol can be accurately controlled; by accurately controlling the injection amount, a proper amount of methanol fuel can be provided according to the actual demand of an engine, waste and incomplete combustion of the fuel are avoided, the injection time of methanol in an air cylinder can be more reasonable by accurately controlling the injection time, the injection time can be better matched with the processes of air inlet, compression and the like, and the combustion efficiency is improved.

The invention relates to an injection system, an engine, a vehicle and an injection control method. The injection system comprises a high-pressure oil pump, a main injection loop and a pre-injection loop. The high-pressure oil pump is provided with a first output end and a second output end. The main injection circuit includes a first high pressure common rail tube fluidly connected with the first output, and a main injector connected with the first high pressure common rail tube. The pre-injection circuit includes a second high pressure common rail tube fluidly connected with the second output, and a pre-injector connected with the second high pressure common rail tube. The pre-injection circuit is configured to inject at a lower pressure than the main injection circuit. Through the arrangement of the integrated oil pump, the system structure is remarkably simplified, and the manufacturing cost is reduced. Meanwhile, the pressure of the two loops is independently adjustable, flexible combination of pre-injection and main injection can be achieved, the injection atomization effect and the combustion process are optimized, and therefore the dynamic property, economical efficiency and emission performance of the engine are comprehensively improved.

The present application relates to a kind of monomer pump common rail quick pressure building method, device and motor vehicle, before obtaining tooth signal, the first tooth signal obtained is virtual 0 number tooth, second tooth signal is virtual 1 number tooth, in turn analogies;When virtual N0 number tooth is obtained, according to the drive duration of pre-marking, drive monomer pump to run;During monomer pump continues to run to virtual 2N0 number tooth, if still not obtain tooth signal, and the pressure in common rail pipe rises, then with odd multiple N0 as the driving time of monomer pump, and the driving duration is N0 tooth signal;If the pressure in common rail pipe does not rise, then with even multiple N0 as the driving time of monomer pump, and the driving duration is N0 tooth signal, to common rail pipe pressure rise.

The invention relates to the technical field of switch rails, in particular to a production method of an elastic bendable switch rail for a compound dividing turnout, which comprises the following steps: determining the steel rail model of the switch rail according to the model of a stock rail; determining the machining range of the switch rail according to the steel rail model; precise cutting is conducted on the determined machining range through slicing machining, the horizontal inertia moment and the flexural rigidity of the switch rail are weakened, and an elastic bendable section is formed; the cut switch rail is subjected to precision verification; forging and pressing the point rail subjected to precision verification, and processing the section of the point rail into a common steel rail section consistent with that of the stock rail; the forged and pressed switch rail is cooled, straightened and detected, the switch rail produced through the method is stable and simple in structure, the problems that bolts are broken off, rail seams are eroded and the like are reduced, the reliability of the switch rail is improved, the service life of the switch rail is prolonged, and maintenance convenience of the switch rail is improved.

The utility model provides a common rail experiment table oil way constant temperature control device which comprises a temperature adjusting mechanism arranged on an experiment table body, the temperature adjusting mechanism comprises a cooling box communicated with an oil supply mechanism, a cooling snakelike coil pipe communicated with the oil supply mechanism is arranged in the cooling box, and an air cooler is arranged on the outer side of the cooling box. According to the utility model, the temperature of the oil entering the oil injector on the experiment table through the oil separator can be regulated and controlled through the temperature regulating mechanism, so that the performance test of the common rail oil injector can be carried out smoothly, and the problem that the oil path of the traditional common rail experiment table only depends on single air cooling for cooling is solved; the problems that shutdown is easily caused by too high diesel oil temperature due to long-time performance test, the test can be continued after the oil temperature returns to normal, the cooling mode is single, the temperature of oil liquid entering the oil separator cannot be controlled, and the performance test detection efficiency of the oil injector is greatly reduced are solved.

A pneumatic differential pressure common rail actuator comprises a pneumatic actuator, a pneumatic valve, and a pneumatic control unit. The pneumatic valve comprises a valve body and a rotor valve core. The rotor valve core is inserted radially into the valve body along the direction of extension of the gas pipeline. The rotor valve core rotates circumferentially and is axially and radially limited within the valve body. The upper portion of the rotor valve core slides upward and downward and is coaxially inserted into the valve stem. An arc-shaped guide groove is formed on the circumferential outer wall of the upper portion of the rotor valve core. An air hole is radially formed in the middle portion of the rotor valve core. The bottom of the rotor valve core is rotatably connected to the bottom inner wall of the valve body via a valve core bearing. This pneumatic differential pressure common rail actuator and its actuation posture force analysis method have the advantage of scientific computability. The basic theory of mechanical analysis of the pneumatic differential pressure common rail actuator is established, and the relevant formulas derived based on this basic theory are highly instructive for the design, verification, and testing of the structure of the present invention.

This utility model relates to a common rail injector with replaceable control valves, including a solenoid valve assembly, a metering block assembly, a needle valve assembly, and a locking cap. The solenoid valve assembly includes an injector body, an electromagnet, an armature, a control valve core, a first spring, and a valve ball, with the valve ball detachably mounted on the lower end of the control valve core. The metering block assembly includes a metering block and a ball valve seat, with the ball valve seat detachably fixed in a mounting groove. The needle valve assembly includes a needle valve body, a needle valve core, a control chamber sleeve, and a second spring. The injector body, metering block, and needle valve body are arranged sequentially from top to bottom and detachably fixed together by the locking cap. This utility model is easy to maintain and adjust, and can better meet the usage requirements of marine electronically controlled common rail fuel systems.

This invention relates to a method for calculating the dynamic wear of a plunger pair in a marine common rail jet pump. First, a dynamic model is established to solve for the forces and micro-motions (eccentricity and tilt angle) of the plunger. Then, based on e and , the oil film thickness and pressure are calculated, and the oil film bearing capacity and lateral load are balanced through iteration. Next, surface roughness is introduced to determine the lubrication state, and the Reynolds equation is modified to characterize mixed lubrication. Force balance iteration is performed again to obtain a more accurate oil film pressure and thickness distribution. Finally, based on the results of the modified model, the wear amount is calculated using the micro-protrusion contact theory and the Arcard wear formula. This method, by coupling plunger micro-motion, oil film state, surface morphology, and operating parameters, realizes the calculation of dynamic wear, improves the operating condition adaptability of wear assessment, and provides a certain basis for the condition monitoring and life assessment of the plunger pair.

The present invention belongs to the field of ship control technology, and in particular relates to a multi-mode switching control device for a ship's new energy hybrid common rail system, comprising a power compartment, which is divided into an internal combustion engine chamber, an electric motor chamber, and a battery chamber by layers and partitions, and is respectively equipped with an internal combustion engine, an electric motor, and a battery pack. The driving end of the electric motor is equipped with a first propeller shaft, and an internal combustion engine power access mechanism is provided in the internal combustion engine chamber. A second propeller shaft is installed in the internal combustion engine chamber through the internal combustion engine power access mechanism. The first propeller shaft and the second propeller shaft pass through the power compartment, and a transmission mechanism is provided between the two. The advantage is that the present invention can complete double-propeller reverse braking in the shortest time in the ship's braking mode, greatly improving the ship's braking efficiency, saving fuel usage, and reducing pollutant emissions.

This invention provides a test method for determining injection fusion in multiple injections of a high-pressure common rail system, comprising the following steps: S1. Constructing a high-pressure common rail system injection pattern test system to test the injection pattern of two injections: pre-injection + main injection; S2. Constructing a high-speed photography direct-view test system for the injection process of the high-pressure common rail system to test the spray development characteristics under injection intervals; S3. Processing the images of the spray development process of multiple injections of the high-pressure common rail system, and repeating the spray development characteristic test until the fuel sprays of the two injections merge. The test method for determining injection fusion in multiple injections of a high-pressure common rail system described in this invention employs a spray visualization test method, obtaining the actual development process of real fuel spray in the cylinder, which can accurately determine whether actual fuel spray fusion has occurred in the cylinder, solving the problem of misjudgment of injection fusion based on control signals and injection pattern curves.