471 results about "Common rail" patented technology

The invention discloses a variable environment fuel oil atomization quality test system and test method. The system comprises a high pressure common rail injection system, a low temperature refrigeration system, an electronic control system, an image data acquisition system and an environment test chamber. The low-temperature refrigerating system reduces the temperature of fuel oil in the oil injector through convective heat exchange; the environment test cabin simulates the environment air pressure, temperature and humidity in the cabin according to the actual environment parameters in the cylinder in the engine operation process; the image data acquisition system acquires spray image information of low-temperature fuel oil in a variable environment and performs image processing, and by actually measuring the circulating oil injection quantity during fuel oil injection, the Sott average diameter is calculated according to different empirical formulas, and the fuel oil atomization characteristics are comprehensively analyzed. The invention provides a reliable experimental means for researching the fuel oil atomization condition of the fuel oil in a low-temperature state in a low-temperature environment in the cold start process of the engine, deeply analyzing the influence of a complex environment on the cold start of the engine, and seeking to improve the cold start performance of the engine.

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 discloses a high-pressure common rail pump synchronous tightening device and a using method thereof, and belongs to the technical field of high-pressure common rail pumps. The device is used for fixing an electromagnetic valve on a pump body, and two main stations are arranged in the device and are respectively used for oil dripping and installation height detection of the electromagnetic valve and synchronous screwing of screws; the oil dripping mechanism and the height detection mechanism of the first station ensure that the electromagnetic valve is correctly positioned, and the tightening mechanism of the second station achieves accurate and synchronous tightening of screws through a servo driving motor and a torque sensor. The using method comprises a series of automatic operation steps, and through feedback circulation of the sensor, the accuracy and rapidity of installation of the electromagnetic valve are guaranteed. According to the device, the production efficiency is improved, the labor cost is reduced, and the high-precision installation standard can be achieved.

The utility model discloses a vehicle-mounted dehumidification protection air temperature type carbon dioxide gasification pry. The device comprises a protection box body and a gasifier located in the protection box body, the gasifier is provided with a gasification tube bundle, the front end of the gasification tube bundle is connected with the liquid separation side of a high-pressure common rail pipeline, and the rear end of the gasification tube bundle is connected with a carbon dioxide outlet pipeline through a collection box; the top of the protection box body is provided with a fan, the side face is provided with a shutter, and the bottom is provided with a dehumidification protection net and a folding protection bottom plate. And the fan adopts a blowing type or induced air type working mode, and adopts different air inlet modes according to different air humidity conditions, so that the gasification efficiency and stability are improved. According to the forced convection heat exchange principle, based on the bottom dehumidification device, the inertia separation technology of gas-liquid speed steering is utilized, two different operation states of the draught fan are adopted, and all-weather efficient, stable and safe high-pressure gasification operation is achieved by matching angle adjustment of the shutters on the two sides and air injection and entrainment to remove the influence of the boundary effect of the wall face.

The invention discloses a rail conveying system of a rack rail clamping vehicle for a common rail, and belongs to the technical field of rack rail clamping clamps. The device comprises a rail assembly and a driving part assembly. The rail assembly comprises two common rails and a rack arranged between the two common rails, guide plates are arranged on the two sides of the rack respectively, and the rack and the guide plates extend in the length direction of the common rails. The driving part assembly comprises a frame body, a driving wheel disc assembly meshed with the rack is arranged on the frame body, the two sides of the lower portion of the frame body are each provided with a swing assembly, and each swing assembly comprises a swing frame hinged to the lower portion of the frame body; the middle of the swing frame is hinged to the frame body, the two ends of the swing frame are rotationally connected with wheels respectively, wheel shafts of the wheels are connected with rail clamping assemblies, the wheels are connected with the top face of the common rail in a rolling mode, and the rail clamping assemblies are matched with the guide plates to prevent the wheels from being separated from the common rail.

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 provides a split type deep-sea unmanned cooperation common-rail common-drive pipeline repairing robot and a repairing method, and solves the problem that a deep-sea pipeline repairing machine is a plurality of sets of equipment with a single function and is low in working efficiency. The repairing robot comprises a clamping and positioning mechanism, a rotating disc and at least two pipeline repairing assemblies, the clamping and positioning mechanism comprises a clamping part, and the clamping part is used for clamping and fixing a pipeline penetrating through the clamping part; the rotating disc surrounds the clamping part, the types of the pipeline repairing assemblies are the same or different, and all the pipeline repairing assemblies are installed on the rotating disc and arranged around the axis of the rotating disc at intervals; the rotating disc can be rotatably arranged with the central axis of the clamping part as the axis, so that the pipeline repairing assembly is rotated to the to-be-repaired area of the pipeline, and then the pipeline is repaired. The pipeline cutting operation and the pipeline welding operation are integrated and sequentially carried out on the same disc type track, and track sharing is achieved; and the working efficiency is greatly improved, and one-time machining of the pipeline is better achieved.

Disclosed is a power system for a vehicle comprising a gas-fuelled power plant, one or more fuel delivery devices 26 for delivering fuel to the power plant, a fuel tank 34 configured to provide fuel t

The invention discloses an ammonia gas engine system and an injection control method thereof, belongs to the technical field of ammonia gas engines, and solves the technical problem that the ammonia gas suction volumes of all air cylinders are different due to the structural difference between nozzles. The system comprises an engine body, an ammonia gas cylinder set, an ammonia gas distributor and a control unit, the ammonia gas distributor comprises a gas track chamber, a plurality of injection valves and a common rail chamber, the ammonia gas cylinder set is connected with the gas track chamber through a first ammonia gas pipe, the gas track chamber is connected with the common rail chamber through the injection valves, and a mixer and a throttle valve are arranged on a gas inlet pipe of the engine body. The common rail chamber is connected with the mixer through a second ammonia gas pipe, and the control unit is electrically connected with the injection valve. According to the control method, the injection valves are grouped, and the injection valves are alternately used according to the working condition sequence, so that the performance and emission difference of the engine in the using period of different injection valves is reduced, the performance of the whole engine is improved, emission is reduced, the loss difference of all the nozzles is reduced, and the service life of an engine system is prolonged.

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 utility model discloses a high-pressure common rail injection measuring system which comprises a high-pressure pump, a motor and a controller, the output end of the motor is connected with a cam shaft, the cam shaft is matched with a plunger of the high-pressure pump, the controller is electrically connected with the high-pressure pump and the motor, the motor is provided with a position sensor, and the position sensor is connected with the high-pressure pump. One side of the high-pressure pump is connected with an input pipeline, the other side of the high-pressure pump is connected with an output pipeline, both the input pipeline and the output pipeline are provided with pressure sensors, and the output pipeline is provided with a flow sensor. The position sensor, the angle sensor, the pressure sensor and the flow sensor are all electrically connected with the controller. The high-pressure common rail injection measuring system with the structure can truly simulate the operation of a high-pressure conjugate system, so that data support for verifying an oil path system, a control system and an algorithm is provided, and the flexibility of research and development is improved.

The present invention discloses a common rail fuel injector, wherein the electromagnetic valve assembly is connected to the top of the fuel injector body, the filter assembly is connected to the side of the fuel injector body, the common rail pair is arranged at the bottom of the fuel injector body, the piston assembly is arranged inside the fuel injector body, and the lower end of the piston assembly is connected to the common rail pair; the filter assembly is provided with a filter, and the filter is pressed into the fuel injector body by interference fit; the needle valve is arranged inside the needle valve body, an oil storage tank is formed between the needle valve body and the needle valve, and a spray hole is formed at the bottom of the needle valve; the control piston is arranged inside the piston sleeve, and the control chamber is formed between the piston sleeve and the top of the control piston; the oil inlet metering hole is arranged on the side of the piston sleeve, and the oil inlet metering hole is connected to the control chamber; the oil outlet metering hole is arranged on the top of the piston sleeve, and the oil outlet metering hole is connected to the control chamber. The present invention can accurately control the injection time and the amount of fuel injection, and can achieve better emission indicators, filter impurities in high-pressure oil, and extend the service life.

The invention relates to an ammonia fuel high-pressure injection and ignition system. The system comprises a cam shaft, an ammonia fuel common rail pipe, a first purge valve, a second purge valve, an ammonia fuel electronic control unit pump and an ammonia injection module of a dual-fuel injector. The oil injection module comprises a diesel oil combined high-pressure oil pump, a diesel oil common rail pipe and a dual-fuel injector; when the cam shaft rotates, the ammonia fuel electronic control unit pump is driven to feed pressurized ammonia fuel into the ammonia fuel common rail pipe, and high-pressure ammonia fuel in the ammonia fuel common rail pipe is injected into a combustion chamber of the internal combustion engine through an ammonia injection module of the dual-fuel injector. After the internal combustion engine is shut down, the first purge valve is used for introducing purge gas into the ammonia fuel common rail pipe, and residual ammonia fuel in the ammonia fuel common rail pipe is discharged from the second purge valve along with the purge gas; and the diesel oil combined high-pressure oil pump feeds the pressurized diesel oil into the diesel oil common rail pipe, and then the diesel oil is injected into a combustion chamber of the internal combustion engine through an oil injection module of the dual-fuel injector so as to ignite ammonia fuel.

The multi-step hot forging simulation system of the fuel rail of the automobile diesel engine of the present application establishes a finite element simulation model of the multi-step forging process of the high-pressure fuel rail parts, analyzes the parameter requirements of the finite element numerical simulation FORGE of the screw press, and obtains general conclusions for important characteristic factors including initial energy, machine tool stiffness, and efficiency; based on the research conclusions of the forging machine tool and the software template, the finite element simulation of the rough machining and finishing forging process of the high-pressure fuel rail in the high-pressure common rail fuel system of the diesel engine is realized. It helps to predict the final state, performance and quality of the material under the actual processing environment, so as to achieve the ultimate goal of optimizing the design of plastic forming. It can provide a reference for actual production, and plays an important role in reducing the production cost of the fuel rail, improving product quality, optimizing process design, and improving production efficiency. It helps to improve the stability, reliability, safety and dynamic performance of the fuel rail.

The invention discloses an air inlet system. The air inlet system comprises an air inlet main pipe, an air outlet main pipe and an air outlet main pipe, one end of the air inlet manifold is connected with the bottom of the air inlet main pipe and communicated with the main pipe cavity, and the other end of the air inlet manifold faces one side of the air inlet main pipe; the enclosure cavity is arranged on the other side of the air inlet main pipe; the common rail pipe is arranged in the enclosure cavity; the combustion substance inlet pipeline is arranged on the gas inlet main pipe; the common rail pipe is communicated with the inlet pipeline through a common rail electronic control valve; the backflow pipeline is arranged on the air inlet main pipe and is communicated with the enclosure cavity; the common rail pipe is communicated with a fuel substance backflow pipeline through an overflow valve; the manifold electronic control valves are arranged between the common rail pipe and the injectors, and each injector is used for injecting combustion substances into the intake manifold; therefore, the combustion substance is injected into the intake manifold according to the requirement and then enters the combustion chamber after being mixed with the air, and the problem that the requirement for an injection system is high due to the corrosivity of the combustion substance is solved.

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 utility model discloses a fuel supply and security system for a marine ammonia fuel engine, including a liquid ammonia fuel tank, a nitrogen tank, a fuel supply skid unit, an ammonia capture unit, a high-pressure common rail double-wall pipe, a central control unit and a collection tank. The utility model significantly improves the safety and stability of the marine ammonia fuel engine. The fuel supply skid unit realizes high-coverage high-pressure purge of ammonia accumulation at the bottom of the fuel supply skid unit box and high-efficiency discharge and replacement of gaseous ammonia. The nitrogen capture unit can not only process pure ammonia vapor volatilized from the liquid ammonia storage tank, but also process ammonia-nitrogen mixed gas sent from the fuel supply skid and the collection tank, effectively increasing the working margin and processing capacity of the ammonia capture unit.

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 utility model discloses an engine and a double-layer common rail pipe thereof. A body of the double-layer common rail pipe comprises a body inner-layer pipe body, a body outer-layer pipe body and two flanges which are fixedly connected together. The two flanges are connected to the two ends of the body inner-layer pipe body and the two ends of the body outer-layer pipe body respectively. A body outer-layer flow channel is formed between the body outer-layer pipe body and the body inner-layer pipe body, and a body inner-layer flow channel is formed in an inner cavity of the body inner-layer pipe body. A connector is detachably connected to the body and comprises a connector outer-layer pipe body and a connector inner-layer pipe body, a connector outer-layer flow channel communicated with the body outer-layer flow channel is formed between the connector outer-layer pipe body and the connector inner-layer pipe body, and a connector inner-layer flow channel communicated with the body inner-layer flow channel is formed in an inner cavity of the connector inner-layer pipe body. When the double-layer common rail pipe is matched with external connecting pieces of different specifications, the connectors matched with the external connecting pieces can be selected to be used, the double-layer common rail pipe can be connected with the external connecting pieces of different specifications in a matched mode, usability and universality of the double-layer common rail pipe are improved, and using cost is 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).