2173 results about "Turbocharger" patented technology

There is provided a centrifugal impeller for a compressor of a turbocharger. The impeller comprises a hub and a blade. The hub extends along an impeller axis. The blade extends from the hub. The blade defines a pressure surface and a suction surface. The pressure surface comprises a concave portion.

A control system for an engine comprising a turbocharger includes a cold light off catalyst (CLOC), a main catalyst, a CLOC valve, and a controller. The CLOC is positioned in a bypass passage around a turbine of the turbocharger. The main catalyst is disposed downstream of the turbine and the CLOC. The CLOC valve selectively routes exhaust flow from the engine between the turbine and the CLOC. The controller determines whether a temperature of the main catalyst is less than a threshold; commands a CLOC mode wherein the CLOC valve routes at least some exhaust to the CLOC based on the temperature being less than the threshold; determines whether a boost is requested at the engine; determines whether a full turbine input is needed to satisfy the requested boost; and disables the CLOC mode based on a determination that a full turbine input is needed.

The invention provides a marine engine turbocharger fault prediction method based on digital twinning. The marine engine turbocharger fault prediction method comprises the steps that operation parameters and vibration signals of a marine turbocharger are acquired; performing signal processing on the vibration signal; establishing a three-dimensional solid model of the supercharger; establishing a fluid excitation reconstruction model and a vibration response model according to the three-dimensional entity model; performing all-condition fault simulation based on the vibration response model to obtain fault data; constructing a full-condition fault data set and training a fault prediction model, and screening sensitive vibration characteristic parameter categories based on various vibration characteristic parameters; according to a data transmission relationship among the fluid excitation reconstruction model, the vibration response model and the fault prediction model, constructing a corresponding data twinborn model; and inputting the operation parameters and the sensitive characteristic parameters corresponding to the real-time vibration signals into a digital twinborn model, and obtaining an output fault type and a fault degree. According to the method, the fault type and degree of the supercharger are accurately predicted, and the reliability and safety of equipment are improved.

The invention relates to the technical field of engines, in particular to a turbocharger and an engine system. The turbocharger comprises a rotating shaft, an integrated bearing and a middle shell, the rotating shaft is sleeved with the integrated bearing, the integrated bearing is sleeved with the middle shell, an oil supply pipeline is arranged in the middle shell and comprises an oil supply inlet, a connecting pipeline, an oil storage chamber, a bearing chamber, an oil outlet pipeline and an oil return cavity which are sequentially communicated, and the integrated bearing is located in the bearing chamber. The oil supply inlet is higher than the bearing chamber, the oil storage chamber is lower than the bearing chamber, and the oil outlet pipeline is higher than the bearing chamber. According to the turbocharger, under the transient working condition, the oil supply amount of the bearing chamber can meet the use requirement; and under the cold start working condition, the oil supply time is short, the rotating shaft is prevented from being abraded, the service life of the rotating shaft is prolonged, and therefore the turbocharger has the long service life.

The invention discloses a method for predicting the fatigue life of an automobile turbocharger pipeline. The method is characterized by comprising the following steps: firstly, measuring and acquiring an S-N curve of the automobile turbocharger pipeline; constructing a simulation calculation model of the pipeline, and calculating fatigue life values of the pipeline under different conditions through the simulation calculation model to obtain a data set; an MLP neural network prediction model is constructed, the MLP neural network prediction model is optimized through a Bayesian optimization algorithm, and an optimal hyper-parameter combination is sought; substituting the data set into the MLP neural network prediction model of the optimal hyper-parameter combination for training; predicting through the trained MLP neural network prediction model to obtain a fatigue life value of the turbocharger pipeline; the method has the advantages that the credibility and the accuracy of the data sample calculated by the simulation calculation model under different structure parameters and external loads are high, and the Bayesian optimization algorithm is adopted to perform parameter tuning on the MLP neural network prediction model, so that the credibility and the accuracy of the prediction result are high.

An inlet shield with a first portion that is configured to be secured to an inlet of a turbocharger, and a second portion that is configured to be removably coupled to the first portion via magnets, wherein different second portions may have different mesh layouts allowing a consumer to choose different levels of protection and air flow based on desired use.

The invention relates to the technical field of turbocharger experiments, in particular to a turbocharger surge experiment device which comprises a first branch pipe, a second branch pipe, a surge tank and an exhaust pipe, a vortex shedding flowmeter and a first flow adjusting valve are arranged on the exhaust pipe, and the two sides of the exhaust pipe are connected with the first branch pipe and the second branch pipe respectively. A surge relief valve is arranged on a pipeline of the first branch pipe, a second flow regulating valve is arranged on a pipeline of the second branch pipe, a flow limiting valve is arranged at one end of the pressure stabilizing tank, a pressure difference transmitter is arranged at the other end of the pressure stabilizing tank, the flow limiting valve is connected to a pipe section in front of the vortex shedding flowmeter through a connecting pipe, and a three-way connector is arranged on a pipeline of the connecting pipe. And the three-way joint is connected to the pressure difference transmitter through a pipeline at one end. The test device not only can simulate the surge generation condition of the turbocharger, but also can test the surge bearing limit of the turbocharger, and ensures smooth research and development of the turbocharger.

The invention provides a turbocharger performance evaluation method and system, and relates to the technical field of artificial intelligence, and the method comprises the steps of data collection, model establishment, model training, performance state output, performance state evaluation and the like. The system comprises a data acquisition module, a model building module, a model training module, a performance state output module and a performance state evaluation module, the performance of the turbocharger can be comprehensively evaluated based on the equipment aging condition through a built performance degradation model, and the accuracy of turbocharger evaluation is improved.

To solve a problem that there is conventionally required an outboard motor equipped with a supercharger which can be suppressed in an increase in size and an increase in manufacturing cost.SOLUTION: An outboard motor 2 has an internal combustion engine 10, a propeller 24 which is rotated by driving of the internal combustion engine 10, a lower unit 20 which rotatably supports the propeller 24, a lower exhaust passage 21 provided in the lower unit 20, and a supercharger unit 30 provided between the internal combustion engine 10 and the lower exhaust passage 21. The turbocharger unit 30 has a first communication passage 34 with an inlet 34a connected to an exhaust pipe 16 extending from the internal combustion engine 10, a turbine of a supercharger 31 rotated by exhaust gas from the first communication passage 34, a second communication passage 35 with an outlet 35a into which exhaust gas from the supercharger 31 is introduced and which is connected to the lower exhaust passage 21, and a compressor of the supercharger 31, which rotates in conjunction with the turbine to supercharge air to the internal combustion engine 10. The supercharger unit 30 integrally includes the first communication passage 34, the turbine, the second communication passage 35, and the compressor.SELECTED DRAWING: Figure 3

The invention belongs to the technical field of part machining, and relates to an automobile turbocharger part machining device which comprises a mounting disc, and a plurality of clamping columns are arranged on the mounting disc in a sliding mode. An open dovetail groove is formed in one side of the installation disc and extends to the center of the installation disc, a dovetail block is slidably inserted into the dovetail groove of the installation disc, a guide support perpendicular to the dovetail groove is connected to the dovetail block, two limiting clamping plates slide on the guide support, a sliding block slides on the guide support, and a bidirectional lead screw is rotationally arranged on the sliding block. The two ends of the two-way lead screw are in threaded connection with the two limiting clamping plates correspondingly. By means of the limiting effect that the dovetail block moves front and back along the dovetail groove and the limiting effect that the limiting clamping plate and the sliding block move left and right along the guide support, an air pipe opening of the turbine shell faces forwards all the time, meanwhile, centering clamping of the turbine shell is completed through the clamping column, alignment and centering clamping are synchronously carried out, and therefore positioning machining treatment of the turbine shell is facilitated, operation is easy, and the machining efficiency is improved. And manual repeated use of tools for alignment and positioning is not needed.

The invention discloses a turbocharger turbine shell punching and positioning device, and particularly relates to the technical field of metal processing and positioning, the turbocharger turbine shell punching and positioning device comprises an annular frame, a sliding frame, a sleeve block and a synchronous transverse interval positioning mechanism; the synchronous transverse interval positioning mechanism comprises a screw rod, a gear motor, a groove ring, a plurality of connecting shafts and a sleeving rod, and further comprises a synchronous longitudinal interval positioning mechanism and a vertical synchronous positioning assembly. By means of the synchronous transverse interval positioning mechanism, the punching device has the advantages that accurate guiding positioning punching is conducted according to the specified transverse interval, and the punching positioning qualification rate of the turbocharger turbine shell is greatly increased, so that the problem that accurate guiding positioning punching is difficult to conduct on a plurality of hole sites in the turbocharger turbine shell according to the specified transverse interval is solved, and the punching efficiency is improved. And the problem that the punching and positioning qualification rate of the turbocharger turbine shell is greatly reduced due to the fact that accurate guiding, positioning and punching are difficult to carry out on a plurality of hole sites in the turbocharger turbine shell according to the specified longitudinal distance is solved.

A turbocharger device relates to the technical field of internal combustion engine supercharging devices and comprises a bearing body, an oil supply pipeline and an integrated bearing. The integrated bearing comprises a pressing end integrated bearing and a vortex end integrated bearing which are arranged in parallel in the axial direction, the bearing body comprises a bearing seat inner wall face, a supporting sleeve is rotationally arranged in the bearing seat inner wall face, and the pressing end integrated bearing and the vortex end integrated bearing are located on the two sides of the supporting sleeve; the pressure end integrated bearing and the vortex end integrated bearing are correspondingly connected with a first oil supply pin and a second oil supply pin which are communicated with inner cavities of the pressure end integrated bearing and the vortex end integrated bearing in the radial direction, and the first oil supply pin and the second oil supply pin are fixed to the bearing body. The split type bearing system is used for solving the problems that although a split type bearing system in the prior art avoids the influence of high temperature, engine oil consumption is large, inner oil film lubrication is insufficient, and cost is high; although an integrated bearing system realizes low cost and structure simplification, the key problems of sufficient lubrication of an inner oil film, high-temperature reliability of a thrust surface and oil control capacity of a gas compressor side are obviously short.

The invention discloses a molecular film type automotive nitrogen and oxygen separation device which comprises a turbocharger, a nitrogen and oxygen separator, a gas inlet valve, a gas outlet valve, a negative pressure pump and an electric control throttling valve. The turbocharger is driven by a turbine in an automobile turbocharger, so that the air is compressed to be conveyed to two paths of the nitrogen and oxygen separation device, the nitrogen and oxygen separation device can separate oxygen from the air, the air with high oxygen content is output, and the air is supplied to an engine for use through the gas outlet valve. The two paths of the nitrogen and oxygen separation device work alternately, when the temperature of the two paths of the nitrogen and oxygen separation device is too high to influence oxygen production efficiency, a main air inlet pipeline is opened to provide air normally by controlling the opening degree of the electric control throttling valve, and thus the phenomena of gas circuit plugging and engine stalling are avoided. According to the automotive nitrogen and oxygen separation device, the two branch paths work alternately, high concentration oxygen can be supplied to the engine continuously so that fuel can burn and act, and the burning utilization rate of the fuel is improved.

The invention relates to the technical field of turbocharger welding, and discloses turbocharger machining automatic welding equipment which comprises a welding table and further comprises a driving clamping mechanism, an automatic welding mechanism, an automatic welding mechanism and an automatic welding mechanism. The two driven clamping mechanisms are arranged on the welding table, located on the two sides of the driving clamping mechanism and used for clamping the two turbines; the two sets of positioning mechanisms are arranged on the two sides of the welding table and used for positioning the turbine; wherein the driving clamping mechanism comprises two fixing seats. Through cooperation of the driving clamping mechanism and the driven clamping mechanism, automatic centering and positioning of a turbine shaft and a turbine are achieved, an adjusting ring in the driving clamping mechanism pushes a sliding rod through an arc-shaped hole, so that multiple clamping rods synchronously move in the radial direction, automatic centering and clamping of the turbine shaft are achieved, and due to the design of an arc-shaped extension clamping plate of the driven clamping mechanism, the clamping efficiency is improved. And when the turbine is clamped, accurate centering with the turbine shaft is completed, the clamping precision and efficiency are remarkably improved, and the error problem existing in traditional manual centering is effectively avoided.

The invention discloses an ammonia fuel combustion system and a control method thereof, and relates to the technical field of fuel combustion. The system comprises an ammonia engine, a reforming hydrogen production device, a preheating box, an ammonia storage device, a premixer and a turbocharger, wherein the reforming hydrogen production device comprises a reaction inner cavity and a heating outer cavity. The premixer mixes gases from the ammonia reservoir, the turbocharger, and the reaction chamber of the reforming hydrogen production unit. The reaction inner cavity of the reforming hydrogen production device is used for carrying out decomposition reaction on ammonia-containing gas from the ammonia storage device and the turbocharger to obtain hydrogen-containing gas, and providing the hydrogen-containing gas to the premixer. A waste gas outlet of the ammonia engine is connected to a heating outer cavity of the reforming hydrogen production device, and the heating outer cavity provides reaction heat for the reaction inner cavity. The heating outer cavity is connected to the preheating box, and the preheating box preheats ammonia-containing gas input into the reaction inner cavity through ammonia engine waste gas from the heating outer cavity. The hydrogen production efficiency can be improved, so that the operation performance of the engine is improved.

The invention relates to the technical field of hydrogen engines, and particularly discloses a hydrogen engine crankcase pipeline hydrogen concentration control method, device and system.The method comprises the steps that the hydrogen concentration in a crankcase ventilation pipeline in the current period, the mixed gas flow in the crankcase ventilation pipeline and the air flow at the front end of an air inlet header pipe are obtained; then the hydrogen concentration of the rear end of the gas inlet main pipe in the current period is calculated; the hydrogen concentration of the rear end of the intake manifold in the current period is compared with a hydrogen concentration threshold value, and the actual air-fuel ratio of the hydrogen engine in the current period is calculated according to a comparison result; and when the actual air-fuel ratio of the hydrogen engine in the current period is inconsistent with the required air-fuel ratio, the flow of hydrogen sprayed by the hydrogen nozzle in the next period is adjusted, so that the actual air-fuel ratio of the hydrogen engine in the next period reaches the required air-fuel ratio. The risk that high-concentration hydrogen mixed gas explodes in the turbocharger can be eliminated, meanwhile, the air-fuel ratio of the hydrogen engine is accurately controlled, and the risks of preignition and detonation are reduced.

The turbocharger impeller comprises a first impeller disc and a limiting shell, a plurality of concave sliding grooves are formed in the upper surface of the first impeller disc, the interiors of the concave sliding grooves are connected with convex sliding blocks in a sliding mode, the upper surfaces of the convex sliding blocks are fixedly connected with impeller blades, and the lower surfaces of the convex sliding blocks are fixedly connected with the limiting shell. Inserting grooves are formed in the two sides of the upper surface of the limiting shell, bolts matched with the inserting grooves are fixedly connected to the two sides of the upper surface of the first impeller disc, and the surfaces of the bolts are sleeved with fixing nuts in a threaded mode. According to the device, the concave sliding grooves and the convex sliding blocks are arranged, so that the device can simply and conveniently disassemble and assemble the impeller blades, when a certain impeller is damaged in the using process of the turbocharger, the damaged impeller can be directly disassembled, and the limiting shell is arranged, so that the impeller can be conveniently disassembled and assembled. And the device can limit the impeller blades into the first impeller disc through the limiting shell, and dislocation of the impeller blades is avoided when the turbocharger works.

The invention belongs to the technical field of marine turbochargers, and discloses a marine turbocharger floating ring bearing rotor system lubrication model construction method, which comprises the following steps: S1, respectively carrying out physical modeling and mathematical modeling according to a real object of a three-blade and half-floating ring bearing of a marine turbocharger, and solving; s2, according to the oil film temperature-viscosity effect, the steady-state heat balance, the power consumption and the flow, a steady-state thermal fluid dynamic lubrication analysis model of the three-blade and semi-floating-ring bearing is constructed, and the static characteristics of the three-blade and semi-floating-ring bearing are obtained; s3, establishing a lubricating and wear characteristic theoretical calculation model in the starting process and the transient variable working condition process after starting, and obtaining the transient film thickness, the transient oil film force and the transient rough bearing force in the starting process; and the transient film thickness and the transient oil film bearing capacity after work starting are obtained. According to the method, a floating ring bearing rotor system lubrication model is constructed, the operation performance and safety of the marine turbocharger are improved, and the service life of the marine turbocharger is prolonged.

The invention belongs to the technical field of biomass energy power generation, and particularly relates to a decoupling type biomass gasification power generation system and a multi-parameter cooperative control method.The method comprises the steps that 1, biomass raw materials are fed into a vertical multi-section decoupling gasification furnace to be gasified, a gasifying agent and water vapor are introduced into the decoupling gasification furnace, and the biomass raw materials are gasified by adjusting the introduction amount of the gasifying agent and the water vapor; the temperature of a reduction zone is controlled to be 700-900 DEG C; 2) cooling a gasification product of the decoupling gasification furnace through a heat exchanger, performing primary filtration through a filter I, removing moisture through a steam-water condensation separator, pressurizing through a Roots blower, performing secondary filtration through a filter II, and feeding into an internal combustion engine for power generation; and (3) gas exhausted by the internal combustion engine is supercharged by an exhaust turbocharger, compressed by a compressed air generator and sent to the decoupling gasifier as a gasifying agent. The system has the advantages that in-situ high-temperature catalytic cracking of tar, efficient utilization of waste heat and stable operation of the system can be realized, the power generation efficiency is improved, and meanwhile, the equipment cost is reduced.

A turbocharger capable of improving local oil supply and negative pressure oil leakage capacity relates to the technical field of turbochargers and comprises a thrust bearing plate arranged between a shaft seal and a thrust sleeve. Thrust oil wedges are arranged on the opposite side walls of the thrust bearing plate, an oil supply channel is formed in the thrust bearing plate and comprises a first oil collection cavity and a second oil collection cavity which are sequentially and annularly arranged from outside to inside, and first oil collection cavity oil outlet holes communicated with the first oil collection cavity are formed in the opposite side walls of the thrust bearing plate correspondingly. And the second oil collecting cavity oil outlet hole is communicated with the second oil collecting cavity. The thrust bearing solves the problem that in the prior art, oil supply is relatively thin in the area with high bearing capacity on the thrust surface of the thrust bearing; and in order to avoid the reliability problem of dynamic and static interference, a gap between a dynamic piece and a static piece forming a labyrinth structure needs to be designed to be large enough, so that the negative pressure resistance oil leakage of the labyrinth structure is limited.

The utility model discloses a novel turbocharger which comprises a gas compressor volute, a bearing body and a turbine box. The left end and the right end of the bearing body are in sealed connection with the gas compressor volute and the turbine box correspondingly. Two full-floating bearings are arranged in the bearing body; a turbine rotating shaft is pivoted in the full-floating bearing; the upper part of the bearing body is provided with a bent oil inlet channel; an oil inlet formed in the lower end of the oil inlet channel communicates with a top opening in the left end of the lubricating oil way. An oil return cavity is formed in the lower part of a shell of the bearing body; an oil return hole is formed in the bottom of the oil return cavity; and a water cooling cavity is formed in the bearing body. The supercharger is provided with the oil return cavity and the water cooling cavity, the two ends of the water cooling cavity are connected with the water inlet and the water outlet, the internal space can be effectively utilized, the structure is more compact, the efficient heat dissipation effect can be achieved in the limited space, and the overall space of the supercharger is saved; according to the utility model, the problems of incompact structure, large volume and the like of the water-cooling row can be solved, and the effects of compact structure and small volume are achieved.

The invention discloses an engine EGR system, a control method and a vehicle. The engine EGR system comprises a turbocharger, a first valve, an electric compressor, an intercooler, an EGR cooler and at least one air cylinder. The exhaust end of the air compression assembly is connected with the first end of the intercooler, and the second end of the intercooler is connected with the air inlet end of the air cylinder. The first end of the first valve is connected with the exhaust end of the air compression assembly, the second end of the first valve is connected with the second end of the EGR cooler, the third end of the first valve is connected with the first end of the electric air compressor, and the second end of the electric air compressor is connected with the intercooler; air enters through the air inlet end of the air compression assembly, and the first valve controls the intervention condition of the electric air compressor by adjusting the opening degree of the first valve. Air passes through the intercooler and the air cylinder to generate waste gas, and at least part of the waste gas flows into the turbine assembly and is exhausted. According to the engine EGR system provided by the invention, the intervention condition of the electric gas compressor is controlled through the action of the first valve, so that the purpose of adapting to multiple working conditions and multiple scenes is achieved.

The invention belongs to the technical field of turbocharger experiments, and particularly relates to a turbocharger combustion chamber and an experiment bench thereof.The turbocharger combustion chamber comprises a flange base, an outer shell and an inner shell, a first air channel is formed between the inner shell and the outer shell, multiple sets of flow guide fins are arranged on the outer wall of the inner shell in a surrounding mode, a first flange is arranged at one end of the outer shell, and a second flange is arranged at the other end of the outer shell; a first flange is arranged at one end of the outer shell, an annular air guide pipe is installed at one end of the first flange, multiple sets of high-pressure injection nozzles are arranged on a pipe body of the annular air guide pipe in a surrounding mode, a second flange is arranged at the other end of the outer shell and fixedly connected with a flange base, an air guide base is installed at the end, facing the inner shell, of the flange base, and a fuel gas supply assembly stretching into an inner cavity of the inner shell is arranged in the middle of the air guide base. The combustion chamber is adopted to simulate high-speed and high-heat waste gas exhausted by the engine, and the characteristics of the waste gas under different working conditions can be accurately simulated by adjusting parameters such as the fuel supply amount and the air flow of the combustion chamber.

The present invention relates to a diagnostic method for coupled exhaust gas turbochargers (10, 20) in an internal combustion engine (1), and to a diagnostic system for carrying out the diagnostic method according to the invention. According to the diagnostic method according to the invention, a first boost pressure is measured in a first charge air system (10a) of a first exhaust gas turbocharger (10) upstream of a first throttle valve (13), which leads to a first intake manifold (14) of a first cylinder bank (15), and a second boost pressure is measured in a second charge air system (20a) of a second exhaust gas turbocharger (20) upstream of a second throttle valve (23), which leads to a second intake manifold (24) of a second cylinder bank (25). Subsequently, a deviation between the first boost pressure and the second boost pressure is determined.Furthermore, the determined deviation is compared against a defined error threshold and an error message is issued if the deviation of the two boost pressures is greater than the error threshold.

The electronic actuator for the turbocharger comprises a shell assembly, a connecting rod assembly, a transmission assembly, a driving assembly and an angle sensor assembly, a mounting groove is formed in the bottom end of the interior of the shell assembly, and the mounting groove comprises a circular section, a connection section and an expansion section which are arranged in a communicating mode; the angle sensor assembly is mounted in the mounting groove and extends into the expansion section from the circular section, the connecting rod assembly comprises an output shaft assembly, a deep groove ball bearing, a sealing assembly, a connecting rod and an output pin, the bottom of the output shaft assembly is mounted in the circular section, and the top of the output shaft assembly penetrates through the deep groove ball bearing and extends out of the shell assembly to be connected with the connecting rod. Thus, the angle sensor assembly can be adapted to various different angle sensor assemblies through the mounting groove, the adaptability is good, the axial displacement can be reduced through interference fit of the top end of the output shaft assembly through the deep groove ball bearing, abrasion is reduced, the service life of the product is prolonged, and meanwhile the sealing assembly at the top end of the output shaft assembly is additionally arranged so that the waterproofness of the product can be improved.

The invention discloses welding equipment for an oil return pipe of a turbocharger, and relates to the technical field of machining of oil return pipes of turbochargers. The welding equipment for the turbocharger oil return pipe comprises a fixed chassis, a three-jaw chuck is arranged at the top of the fixed chassis, an internal cleaning assembly is fixedly connected to the top of the fixed chassis, and an external cleaning assembly is fixedly connected to the top of the fixed chassis. According to the welding equipment for the turbocharger oil return pipe, a first spiral plate is driven to rotate, airflow flowing downwards is generated in the turbocharger oil return pipe, a movable rod is matched to drive a friction steel wire to rotate and move up and down at the same time, and the inner wall of the turbocharger oil return pipe is brushed; the airflow promotes discharge of welding slag in the oil return pipe of the turbocharger, so that the welding slag can be brought into the filter screen cylinder by the airflow, and the situation that the welding slag is left in the oil return pipe of the turbocharger, influences use of the oil return pipe of the turbocharger and influences welding quality is avoided.

A turbocharger includes a bearing housing, a variable displacement mechanism, and a restricting member. The variable displacement mechanism includes a nozzle ring and a drive ring. The restricting member includes a flange part, a drive ring guide pin part, and a phase determining pin part. The flange part straddles a first surface of the nozzle ring facing the bearing housing and a second surface of the drive ring facing the bearing housing so that a position thereof with respect to the nozzle ring is fixed. The drive ring guide pin part is formed integrally with the flange part and disposed in a first hole formed on the first surface. The phase determining pin part is formed integrally with the flange part and disposed in a second hole formed on a third surface of the bearing housing facing the variable displacement mechanism.

The invention relates to the technical field of image processing, in particular to a turbocharger shell surface defect detection method, which comprises the following steps: collecting a plurality of turbocharger shell surface grey-scale maps, and carrying out connected domain division on each grey-scale map to obtain a plurality of connected domains; calculating a circumscribed rectangle of the connected domains, taking a central pixel point of the circumscribed rectangle as a central point of an initial neighborhood matrix, and performing layer-by-layer expansion from the central point to the outside according to the size of a preset neighborhood matrix to obtain a plurality of neighborhood matrixes; calculating a density equilibrium index of each connected domain; and traversing the density equilibrium indexes of all the connected domains, and when the minimum value of the density equilibrium indexes is smaller than a preset threshold value, judging that the surface of the turbocharger shell has defects. Through connected domain analysis and density equilibrium index calculation, the influence of external factors on an image analysis result can be reduced, and the accuracy and reliability of defect detection are improved.

A turbocharger with a bleed air brake function relates to the technical field of internal combustion engine supercharging devices and comprises a turbine, the turbine comprises a volute, and a turbine is rotatably arranged in the volute; a first flow channel and a second flow channel which are used for introducing waste gas are arranged on the volute, the first flow channel is communicated with a turbine flow channel, the second flow channel is communicated with a turbine back disc through a perforated heat insulation cover, and a flow channel switching mechanism which is used for connecting and disconnecting the first flow channel or the second flow channel is arranged on the volute. The problems that in the prior art, after an exhaust brake valve is closed, axial force borne by a thrust bearing is instantly and greatly improved compared with axial force in a normal working state, so that the bearing capacity of the thrust bearing is insufficient, and abrasion of the thrust bearing is accelerated are solved; and the exhaust pressure of the engine cannot be released, so that air leaks from a gap between a sealing ring at the turbine end and a sealing ring groove.

A propulsion assembly for a motor vehicle with an internal combustion engine comprising at least one movable member, a turbocharger comprising a turbine adapted to expand exhaust gases to generate work and a first compressor adapted to compress air by means of the work generated by the turbine, an intake line connecting an outlet of the first compressor to an intake manifold of said engine to supply compressed air from the first compressor to said engine, wherein the intake line comprises a second compressor, which in turn comprises a compressor shaft rotatable about a first axis and is configured to further compress the compressed air from the first compressor via a rotation of the compressor shaft. The propulsion assembly further comprises mechanical transmission means configured to couple the movable member to the compressor shaft, thereby determining a transmission of motion from the movable member to the compressor shaft.