265 results about "Volumetric efficiency" patented technology

The invention relates to a hydraulic pump motor degradation evaluation method and system based on an LSTM neural network and similarity calculation. The hydraulic pump motor degradation evaluation method comprises the steps that key indexes representing hydraulic pump motor degradation and input parameters influencing hydraulic pump motor working conditions are extracted from test data in different working conditions; selecting and dividing the obtained original test data into a training data set and a test data set; performing normalization and data screening on samples in the training data set to obtain data enhancement samples for model training; samples in the test data set are only subjected to normalization processing and are used for model testing; setting model parameters based on data features, obtaining a volumetric efficiency calculation result, and calculating a root-mean-square error; determining operation conditions of the hydraulic pump motor in the test data, and analyzing change trends of degradation index parameters of the hydraulic pump motor in different time periods; the similarity of the degradation index parameters of the hydraulic pump motor in different time periods is calculated, and the degradation degree is obtained; and respectively multiplying a prediction result of the neural network and a similarity calculation result by a weight coefficient of 0.5 to realize degradation evaluation of the hydraulic pump motor.

The invention discloses a diaphragm compressor, which belongs to the technical field of diaphragm compressors, and is characterized in that a second piston is additionally arranged on a piston assembly on the basis of the structure of the existing diaphragm compressor, the second piston is arranged on a piston rod, and the second piston axially reciprocates in a middle body. When the second piston moves rightwards, gas in the first cavity begins to expand, meanwhile, the middles of the diaphragms are vacuumized to enable the three diaphragms to be attached, the volume of the gas cavity is increased, the air suction amount is increased, and therefore the problem that the volume efficiency of the diaphragm compressor is poor due to diaphragm separation is solved. The oil pool of the crankcase is vacuumized, bubbles contained in oil in the oil pool of the crankcase are removed, the elasticity modulus of hydraulic oil is improved, the influence of gas contained in the hydraulic oil on the actual volume efficiency of the high-pressure diaphragm compressor is avoided, and the volume efficiency of the diaphragm compressor is effectively improved.

The invention provides an excavator crushing working condition double-pump flow matching method, device, medium and system. Under the condition that the excavator carries out crushing working condition operation, the pressure difference between the auxiliary pump and the main pump is obtained, and a first pressure difference is obtained; under the condition that the first pressure difference is smaller than a pressure difference threshold value, a current control signal of the auxiliary pump is gradually increased; under the condition that the current control signal of the auxiliary pump is increased every time, the pressure difference between the auxiliary pump and the main pump is obtained again, and a second pressure difference is obtained; and under the condition that the second pressure difference is larger than or equal to the pressure difference threshold value, the current control signal of the auxiliary pump is kept the same as the current control signal of the auxiliary pump at the current moment under the current crushing working condition. The problem that the confluence effect of two hydraulic pumps in an existing scheme is sometimes affected by volume efficiency difference and abrasion failure of the hydraulic pumps under different boundary conditions, so that the flow of an auxiliary pump cannot be converged with a main pump through a confluence one-way valve, and the crushing operation effect is affected is solved.

The utility model provides a double-cylinder double-stage compressor and a refrigerating system with the same, and belongs to the technical field of air conditioning, the double-cylinder double-stage compressor comprises a shell, a pump body assembly is arranged in the shell, the pump body assembly is provided with a reciprocating compression part and a rotary compression part, the rotary compression part comprises a roller, the reciprocating compression part comprises a piston, and the piston is arranged in the shell. The pump body assembly is further provided with a crankshaft, the crankshaft is further provided with a first eccentric part corresponding to the roller so as to drive the roller to rotate, and the crankshaft is provided with a second eccentric part corresponding to the piston so as to drive the piston to reciprocate. According to the reciprocating compressor, the crankshaft with the first eccentric part and the second eccentric part simultaneously drives the rotary compression part and the reciprocating compression part to compress, so that the advantages of compact structure of the reciprocating compressor and high volume efficiency of the rotary compressor can be considered; therefore, the whole structure of the double-cylinder double-stage compressor is compact, the volume efficiency is high, the whole energy efficiency of the compressor is improved, and the refrigerating capacity of the compressor is improved.

The invention discloses an intelligent plunger pump fault diagnosis system and a diagnosis method, which realize accurate monitoring of the tilt angle of a swash plate, can adjust and accurately control the output flow of a pump in real time in combination with a built-in control operation unit, and meanwhile, outputs pressure data in cooperation with a proportional pressure reducing valve, and compares the pressure data with a threshold value in a first fault diagnosis module, so that the fault diagnosis accuracy is improved. Judging whether a proportional pressure reducing valve and a variable adjusting mechanism of the pump are abnormal or not; and in cooperation with shell pressure data, whether the leakage amount of the pump is abnormal or not is judged by comparing the pressure data with a threshold value in the second fault diagnosis module, and faults caused by flow fluctuation or abnormality are effectively prevented. And whether the volumetric efficiency of the pump is too low or not is judged by comparing with a threshold value in the third fault diagnosis module, so that the universality and accuracy of a volumetric efficiency diagnosis algorithm are remarkably improved.

The invention provides an electronic oil pump, which belongs to the technical field of oil pumps, and comprises: a pump cover, which is provided with an oil inlet and a first oil inlet channel; the motor shell is provided with a motor cavity and an oil return channel; the motor assembly comprises a motor shaft, the motor shaft is rotatably connected with the motor shell, the motor shaft is provided with a second oil inlet channel in the axial direction of the motor shaft, and the oil inlet communicates with the motor cavity through the first oil inlet channel and the second oil inlet channel; and the rotor assembly is located between the pump cover and the motor shell, an oil passing channel is formed in the rotor assembly, and the motor cavity communicates with the oil inlet through the oil return channel and the oil passing channel. The electronic oil pump has the beneficial effects that low-temperature oil enters through the oil inlet, high-temperature oil returns through the oil return channel, double-face oil suction is achieved, the volume efficiency of the electronic oil pump at the high rotating speed is improved, the circulating flow is large, and the cooling effect on the motor assembly and the controller is good.

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 invention provides an intelligent performance test method and system for a multistage series Roots vapor compressor. The method comprises the following steps: introducing vapor into equipment to be tested as a test medium; the to-be-tested equipment comprises a control unit, multiple stages of Roots vapor compressors connected in series, an interstage spraying device and a parameter detection unit; the opening degree of each valve in the pipeline valve assembly and the spraying water flow of the inter-stage spraying device are cooperatively controlled through the control unit, so that each stage of compressor in the to-be-tested equipment is stabilized at a preset test working condition point; after the to-be-tested equipment operates stably, acquiring steady-state operation data within a preset duration through a parameter detection unit; calculating a performance evaluation index of the to-be-tested equipment by using the steady-state operation data; the performance evaluation indexes comprise isentropic efficiency and / or volume efficiency of the compressor. The invention further provides a test system for implementing the method. According to the invention, through intelligent automatic control, the performance test of the multi-stage compressor is realized.

An integrated electro-hydraulic unit including an electric machine, a hydraulic machine, and a shared casing. The electric machine includes a winding and a stator. The hydraulic machine includes a shaft, a cylinder block, a plurality of pistons, and a valve plate. The shared casing includes a cooling channel located between the electric machine and the hydraulic machine. By action of the pistons, a first port on the valve plate receives working fluid pulled into the cylinder block and a second port on the valve plate receives working fluid pushed out. By action of the pistons, a third port on the valve plate is configured to receive a cooling flow of the working fluid. The cooling flow through the third port is separate from the first port and the second port, such that volumetric efficiency measured between the first port and the second port is not affected by the cooling flow.

The invention discloses a gear pump, a suspension system and a vehicle, the gear pump comprises a pump body and a gear set, a first cavity and a second cavity are formed in the pump body, at least one part of the gear set is arranged in the pump body, the gear set comprises a first gear and a second gear, and the first gear is arranged in the first cavity. Teeth of the first gear are meshed and matched with teeth of the second gear, the first cavity and the second cavity are separated through a meshing line of the first gear and the second gear, the number of the teeth of the first gear and the number of the teeth of the second gear are both N, and N is larger than or equal to 13. According to the gear pump, the number of the first gears and the number of the second gears are reasonably set, the undercut probability is reduced, the transmission stability is improved, vibration is reduced, the volume efficiency is improved, and noise is also reduced.

The invention belongs to the technical field of excavator power control, and particularly relates to an excavator constant power control method and system for improving the volume efficiency of an oil pump. The method comprises the steps that when the excavator enters a constant power mode, the current pump pressure and the current required displacement of a hydraulic oil pump under the target rotating speed of an engine are obtained, and required power is obtained through calculation; the ratio of the set power to the required power of the hydraulic oil pump serves as a first input value, and the calibrated minimum displacement of the hydraulic oil pump serves as a second input value; taking the ratio of the second input value to the first input value as an output value; calculating a final request rotating speed according to the ratio of the target rotating speed to the first output value, and adjusting the rotating speed of the engine to the calculated final request rotating speed; and the pump displacement of the hydraulic oil pump is adjusted in real time according to the set adjusting coefficient so as to adjust the actual flow of the pump. The pump displacement is improved by reducing the target rotating speed, the volume efficiency is improved by improving the pump displacement, and the purpose of reducing oil consumption is finally achieved.

The invention provides an excavator engine rotating speed optimizing method based on a particle swarm algorithm, an excavator rotating speed adjusting method, electronic equipment and a storage medium, and belongs to the technical field of engine control. According to the scheme, the method comprises the steps that operation parameter sets of an excavator in different working stages in the excavation circulation process are obtained; according to the operation parameter set of each working stage, initial three-dimensional particles corresponding to the working stage are set, and initialization processing of a particle swarm algorithm is carried out; an evaluation function is constructed according to the fuel consumption rate of the engine, the anti-load capacity of the whole vehicle, the volumetric efficiency of the two hydraulic pumps and the constant flow proportion of the two hydraulic pumps, and an initial global optimal solution of each working stage is obtained through calculation; and performing iterative optimization of an initial global optimal solution on each working stage based on a particle swarm algorithm. According to the excavator engine rotating speed optimization method based on the particle swarm optimization, the rotating speed displacement point with the best economical efficiency can be optimized.

The invention discloses an operation method and system of a liquid-gas dual-mode liquid hydrogen refueling station, the system realizes the switching of a refueling route through a plurality of liquid hydrogen control valves and a control switch of a gas hydrogen control valve, liquid hydrogen output from a liquid hydrogen storage tank is primarily pressurized through a first liquid hydrogen booster pump, and in the liquid hydrogen refueling route, the liquid hydrogen output from the liquid hydrogen storage tank is pressurized through a second liquid hydrogen booster pump. The liquid hydrogen pressurized for the first time is in a supercooled state and is not easy to evaporate, the generation of BOG is greatly inhibited, the leakage amount of the liquid hydrogen in a liquid-liquid filling process can be reduced, the filling efficiency is improved, in a high-pressure hydrogen filling route, the liquid hydrogen in a supercritical state can also effectively reduce the cavitation problem of a pump during secondary pressurization, waste of liquid hydrogen cold energy is reduced, and the production cost is reduced. High volume efficiency can be effectively guaranteed, and durability of equipment and efficient operation of the hydrogen refueling station are guaranteed.

Hydraulic oil compositions and methods of use thereof. Hydraulic oil compositions may comprise a base oil and a performance additive package, the base oil comprising: at least a first base stock and a second base stock; where the first base stock is an OTL oil base stock having a molar ratio of pendant methyl groups to α-methyl groups of from 1.2 / 1 to 5.4 / 1, as determined by carbon 13 nuclear magnetic resonance (13CNMR); and wherein the second oil base stock comprises one or more Group I, Group II, Group II+, Group III, Group III+, Group IV, or Group V oil base stocks, or any combination thereof. Methods of improving volumetric efficiency of a hydraulic oil composition may comprise providing said base oil for the hydraulic oil composition, and optionally, blending said base oil with said performance additive package, thereby forming said hydraulic oil composition.

The utility model discloses an oil-gas mixed transportation double-suction double-screw pump which comprises a pump body, a left-right through inner shell is arranged in the pump body, a driving shaft and a driven shaft which are parallel to each other are arranged in the inner shell in a penetrating mode, the rear ends of the driving shaft and the driven shaft are meshed after penetrating through the pump body in a sealing and rotating mode, and the front ends of the driving shaft and the driven shaft are arranged on the pump body in a sealing and rotating mode. Two blocking rings are arranged between the outer wall of the inner shell and the inner wall of the pump body in a bilateral symmetry mode, a plurality of discharging ports are formed in the position, located between the two blocking rings, of the inner shell, the positions, located in the inner shell, of the driving shaft and the driven shaft are each sleeved with a left-right two-way spiral sleeve, the two left-right two-way spiral sleeves are meshed, and an inlet shell is arranged outside the pump body. Inlet holes communicated with the inlet shell are formed in the positions, located on the outer sides of the two blocking rings, of the outer wall of the pump body, and outlet holes are formed in the positions, located on the inner sides of the two blocking rings, of the outer wall of the pump body. According to the oil-gas mixed transportation double-suction double-screw pump, when the oil viscosity is increased, the volume efficiency is improved by reducing leakage, and therefore the efficiency of the screw pump is improved.

The invention provides a compressor system and a working method of the compressor system. The compressor system comprises a compressor assembly, a gas-liquid separator, an oil-gas separator and a gas pipeline. The compressor assembly comprises a first compression chamber and a second compression chamber which are independently arranged, and the first compression chamber, the gas-liquid separator, the second compression chamber and the oil-gas separator are sequentially communicated through the gas pipeline; the gas-liquid separator is used for separating an oil-gas mixture guided out of the first compression cavity, and the oil-gas separator is used for separating an oil-gas mixture guided out of the second compression cavity. The compressor system comprises the two compression cavities which are connected in series, and the gas-liquid separator is arranged between the two compression cavities, so that the volume efficiency and the polytropic efficiency of the compressor are effectively improved, the input specific power of the compressor system is improved, and the energy efficiency grade of the compressor system is improved.

An internal combustion engine (2) of a series hybrid vehicle automatically stops and automatically restarts a combustion operation in response to a power generation request. It is determined whether or not the catalyst temperature is higher than or equal to the activation temperature at the time of a restart request (S1, S2). When the catalyst temperature is higher than or equal to the activation temperature, fuel injection and ignition are started (S8) substantially simultaneously with the start of motoring of the internal combustion engine (S9). If the catalyst temperature is lower than the activation temperature, the valve timing is changed (S3) and the throttle valve opening is increased (S4) so as to increase the volumetric efficiency, and the motoring is started (S5). When an elapsed time t from the start of motoring reaches a required delay time tD (S6, S7), fuel injection and ignition are started (S8).

The invention belongs to the technical field of plunger pumps, and provides a split block detachable pump head with butt joint type plunger sections. A split block detachable pump head with butt joint type plunger sections comprises a pump head body and a pump body, plunger rods are arranged in the pump head body and the pump body, each plunger rod comprises a first plunger section and a second plunger section which are connected, the first plunger sections and the second plunger sections are both located in the pump body, and nesting parts are arranged at the joints of the first plunger sections and the second plunger sections. The nesting part is provided with a radial connecting hole, and a first fastener is arranged in the radial connecting hole. By adopting the arrangement, the interior and the exterior of the plunger pump can be fully disinfected and washed; the nested parts are axially staggered, so that the bearing capacity of the axial load and the radial load of the first plunger section and the second plunger section can be improved, and the overall rigidity of the plunger rod is improved; the relative positions of the second plunger section and the first plunger section are positioned through the radial connecting holes, and it can be guaranteed that the volume efficiency of the plunger pump is kept stable.

The invention provides a plunger pump volumetric efficiency prediction method based on temperature and load pressure of an oil inlet and an oil return port, which belongs to the field of plunger pump state detection and mainly comprises the following steps: acquiring and processing data of temperature and pressure sensors; and calculating the volumetric efficiency based on the oil inlet temperature, the oil return port temperature and the load pressure. The method specifically comprises the steps that temperature sensors are arranged at an oil inlet and an oil return opening of the plunger pump, a pressure sensor is arranged at an outlet of the plunger pump, and real-time data input is provided for calculating the volume efficiency; a temperature signal conditioning and digital-to-analog conversion device is built, data transmission is completed, and data having interference on calculation of the volumetric efficiency is eliminated; and calculating the volumetric efficiency based on the temperatures of the oil inlet and the oil return port of the plunger pump and the load pressure. According to the method, the high correlation between the temperatures of the oil inlet and the oil return opening of the plunger pump, the load pressure and the volume efficiency is utilized, the real-time mapping relation between the temperatures and the volume efficiency is established, the method for achieving real-time detection and calculation of the volume efficiency of the plunger pump by monitoring temperature signals is provided, and state monitoring and daily maintenance of the plunger pump are facilitated.

This invention provides a pump body assembly and a rotary compressor to improve volumetric efficiency and reduce exhaust noise. The pump body assembly includes: a front-stage cylinder with a first exhaust port; a rear-stage cylinder with a first intake port; a connecting component having a connecting channel; one end of the connecting channel communicating with the first exhaust port and the other end communicating with the first intake port; and a first movable component disposed within the connecting channel. The first movable component includes a first movable member movably disposed along the axial direction of the connecting channel, allowing the connecting channel to have a connected state and a disconnected state, thereby connecting or disconnecting the first exhaust port and the first intake port.

The application discloses a high-end equipment pump motor high-fidelity state evaluation method, comprising the following steps: sequentially constructing an ideal mathematical model, an internal leakage amount mechanism model and an actual output torque calculation model, obtaining theoretical performance parameters, dynamic volumetric efficiency and torque benchmarks; based on health state test data, adopting a multi-objective optimization algorithm to inverse model undetermined parameters, and establishing an individualized health benchmark model; inputting real-time performance signals into the model, calculating the residual error of measured data and model response, extracting a dimensionless health feature vector through normalization processing, obtaining a comprehensive health index through weighted fusion, and realizing precise quantitative evaluation of the health state of the pump motor.

The invention provides an oil return control method and device, a control system, a vehicle and a storage medium. A compressor lubricating system comprises a scroll compressor and an oil-gas separator connected with an air outlet of the scroll compressor; an oil outlet of the oil-gas separator is connected with an oil inlet of the scroll compressor through an oil temperature regulation and control device; the method comprises the steps that the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor are obtained; the target oil temperature is the oil temperature capable of enabling the scroll compressor to be at the target operation efficiency; and when the difference between the current oil temperature and the target oil temperature exceeds a preset temperature difference threshold value, the oil temperature regulation and control device is controlled to cool refrigerant oil flowing through the oil temperature regulation and control device. According to the scheme, the risk that the volume efficiency of the scroll compressor is reduced can be reduced.

The utility model discloses a compressor volumetric efficiency testing device based on an air medium, and relates to the technical field of compressor performance detection. The device comprises a first gas storage tank, a motor, a belt pulley group, a first pressure reducing valve, a second pressure reducing valve, a third pressure reducing valve, an oil storage tank, a second gas storage tank, a third gas storage tank, a first oil-water separator, a second oil-water separator and a support frame, according to the utility model, through the combination of the first gas storage tank, the motor, the belt pulley set, the first pressure reducing valve, the second pressure reducing valve, the third pressure reducing valve, the oil storage tank, the second gas storage tank, the third gas storage tank, the first oil-water separator and the second oil-water separator, the equipment is simplified, the cost is reduced, and complicated parts such as a condenser, an evaporator and an expansion valve are not needed; equipment design and manufacturing cost is reduced, operation is simple, precision is higher, air media have no phase change problem, the testing process is simple, data are more stable, and measuring precision is higher.

The application provides a compressor back pressure adjusting structure and a compressor. The compressor back pressure adjusting structure comprises a support for supporting a compression assembly of the compressor; a main body arranged on the support, wherein a gas flow discharged by the compression assembly can at least partially flow between the main body and the support and push the support to rotate; and a plurality of first channels with different flow areas are arranged on the main body, wherein the first channels have first ends and second ends, the first ends are open towards the compression assembly, and the second ends are arranged on the outer wall of the main body, and the gas flow between the main body and the support flows into one of the first channels through the second end and is discharged from the first end. According to the application, the defect that the back pressure of the compressor cannot be adjusted in the prior art, which leads to poor stability of the compressor in operation, can be overcome, and the volumetric efficiency of the compressor can be effectively improved and the power consumption of the compressor can be reduced.

The invention discloses a low-leakage Roots rotor profile with a larger shape coefficient, which is composed of half-leaf profiles symmetrically adjacent to the pitch circle of twice the number of blades, wherein the half-leaf profile is sequentially composed of four parts, namely, a peak concentric arc outside the pitch circle, a peak conjugate profile, a valley transition curve inside the pitch circle, and a valley concentric arc, which are connected end to end, and the corresponding endpoints and connection points are sequentially a peak point, a vertex, a midpoint, a root point located on the peak symmetry axis, and a valley point located on the valley symmetry axis. The invention has a larger shape coefficient and volume utilization coefficient; has a smaller radial leakage rate and a conjugate leakage rate, and thus has a higher volumetric efficiency and a better lightweight effect.

The utility model relates to a resonance type liquid pumping device and a power system, a closed cavity structure used for containing liquid is formed in the device, the device comprises a cavity body, a liquid inlet, a first one-way conducting piece, a liquid outlet, a second one-way conducting piece, a connecting hole and a vibration assembly, the liquid inlet is formed in the cavity body, and the liquid outlet is formed in the cavity body. The liquid is guided into the cavity main body; the liquid outlet is used for leading out liquid; the vibration assembly covers the connecting hole, and the vibration assembly conducts electricity through an internal quartz structure and enables the vibration assembly to vibrate, so that the volume of the cavity body is changed, and liquid is guided in or guided out. By the adoption of the scheme, liquid pumping is achieved through the piezoelectric effect of quartz and volume change caused by deformation of the vibration assembly, electric energy is directly converted into liquid volume deformation, compared with a transmission pump, the middle process that kinetic energy of a motor is converted and then output is omitted, and the conversion efficiency is high; in addition, volume change is directly output through deformation of the vibration assembly, and the volume efficiency of the device is high.

The invention relates to the technical field of agricultural machinery, in particular to a crawler belt straight movement keeping hydraulic system, a control method and agricultural machinery. In the hydraulic system, a left track closed pump is connected with a left track walking motor through a left flow regulating valve group, and a right track closed pump is connected with a right track walking motor through a right flow regulating valve group; the left flow regulating valve group and the right flow regulating valve group respectively comprise a proportional valve and a constant pressure difference pressure reducing valve, the inlet and outlet pressure difference of the proportional valve is kept at a preset value through the constant pressure difference pressure reducing valve, and the flow of hydraulic oil entering the left crawler walking motor and the right crawler walking motor is regulated by changing the current of the proportional valve. The proportional valve and the constant pressure difference pressure reducing valve are adopted for flow control and pressure compensation, and the flow control precision is high, so that the rotating speeds of the walking motors on the left side and the right side can be accurately adjusted, and it is ensured that the rotating speeds of the two walking motors tend to be consistent; closed-loop control is adopted, the actual rotating speed serves as the target, and the influence of the volume efficiency of the closed pump and the travel motor is avoided.

The invention discloses an electric compressor, an air conditioning system and a vehicle. The electric compressor comprises a shell assembly, wherein a high-pressure cavity and an oil pool connected with the high-pressure cavity are arranged in the shell assembly; the compression mechanism is arranged in the shell assembly and comprises a crankshaft, an air cylinder and a sealing cover part, the air cylinder is provided with an air cylinder cavity, the sealing cover part sleeves the crankshaft and is arranged on the end face of the air cylinder to seal the air cylinder cavity, and the crankshaft penetrates through the air cylinder and the sealing cover part; a medium-pressure oil storage cavity is formed between the inner circumferential face of the sealing cover component and the outer circumferential face of the crankshaft. A throttling oil supply structure communicated with the medium-pressure oil storage cavity and the oil pool is arranged on the sealing cover component. By arranging the medium-pressure oil storage cavity and the throttling oil supply structure, the leakage amount of lubricating oil flowing to the air suction cavity through the gap can be reduced, abrasion of internal parts is reduced, the oil spitting amount of the electric compressor is reduced, oil shortage damage of the electric compressor is reduced, and the volume efficiency and performance are improved.

A port and direct fuel injection (PDI) fuel delivery system for a vehicle having an engine configured to selectively operate between a port fuel injection (PFI) mode, a gasoline direct injection (GDI) mode, and a PDI mode, the system including a PFI system including a plurality of PFI injectors, and a GDI system including a plurality of GDI injectors. The PFI and GDI systems are configured to provide various fuel mass injection split ratios to the engine based on particular engine operating conditions. The controller is programmed to identify a known first long term fuel correction (LTFT) for the first split ratio, identify a known second LTFT for the second split ratio, generate a linear equation based on the known first and second LTFTs, and determine an unknown third LTFT for the third split ratio using the linear equation in order to reduce fueling errors and emissions.

According to the pump body assembly, the working volume of a low-pressure compression cavity is V1, the minimum radius of a first air suction port is R1, the working volume of a high-pressure compression cavity is V2, the minimum radius of a second air suction port is R2, the connecting line of the center of a first sliding piece groove and the axis of a crankshaft is L1, and the connecting line of the center of the first air suction port and the axis of the crankshaft is L2; the connecting line of the center of the first exhaust port and the axis of the crankshaft is L3, the connecting line of the center of the second sliding piece groove and the axis of the crankshaft is L4, the connecting line of the center of the second air suction port and the axis of the crankshaft is L5, the connecting line of the center of the second exhaust port and the axis of the crankshaft is L6, and in the rotating direction of the crankshaft, the included angle formed by L1 and L2 is theta 1, and the included angle formed by L1 and L3 is theta 2. The included angle formed by L4 and L5 is theta3, the included angle formed by L4 and L6 is theta4, U = (V1 * theta2 * theta3 * R2) / (V2 * theta1 * theta4 * R1), 0.6 < = U < = 5.2, and the volume efficiency of the compressor can be improved.